10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x	Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
	For the Quarterly Period Ended: March 31, 2015
o	Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Commission File Number: 001-15891

NRG Energy, Inc.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	41-1724239 (I.R.S. Employer Identification No.)
211 Carnegie Center, Princeton, New Jersey (Address of principal executive offices)	08540 (Zip Code)

(609) 524-4500

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

YesxNoo

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

YesxNoo

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer x	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

YesoNox

As of April 30, 2015, there were 333,494,559 shares of common stock outstanding, par value $0.01 per share.

1

TABLE OF CONTENTS

Index

CAUTIONARY STATEMENT REGARDING FORWARD LOOKING INFORMATION	3
GLOSSARY OF TERMS	4
PART I — FINANCIAL INFORMATION	8
ITEM 1 — CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND NOTES	8
ITEM 2 — MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	47
ITEM 3 — QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	74
ITEM 4 — CONTROLS AND PROCEDURES	76
PART II — OTHER INFORMATION	77
ITEM 1 — LEGAL PROCEEDINGS	77
ITEM 1A — RISK FACTORS	77
ITEM 2 — UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	77
ITEM 3 — DEFAULTS UPON SENIOR SECURITIES	77
ITEM 4 — MINE SAFETY DISCLOSURES	77
ITEM 5 — OTHER INFORMATION	77
ITEM 6 — EXHIBITS	78
SIGNATURES	79

2

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

This Quarterly Report on Form 10-Q of NRG Energy, Inc., or NRG or the Company, includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or Exchange Act. The words "believes," "projects," "anticipates," "plans," "expects," "intends," "estimates" and similar expressions are intended to identify forward-looking statements. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause NRG's actual results, performance and achievements, or industry results, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. These factors, risks and uncertainties include the factors described under Item 1A — Risk Factors Related to NRG Energy, Inc., in Part I, Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2014, and the following:

• General economic conditions, changes in the wholesale power markets and fluctuations in the cost of fuel;

• Volatile power supply costs and demand for power;

• Hazards customary to the power production industry and power generation operations such as fuel and electricity price volatility, unusual weather conditions, catastrophic weather-related or other damage to facilities, unscheduled generation outages, maintenance or repairs, unanticipated changes to fuel supply costs or availability due to higher demand, shortages, transportation problems or other developments, environmental incidents, or electric transmission or gas pipeline system constraints and the possibility that NRG may not have adequate insurance to cover losses as a result of such hazards;

• The effectiveness of NRG's risk management policies and procedures, and the ability of NRG's counterparties to satisfy their financial commitments;

• Counterparties' collateral demands and other factors affecting NRG's liquidity position and financial condition;

• NRG's ability to operate its businesses efficiently, manage capital expenditures and costs tightly, and generate earnings and cash flows from its asset-based businesses in relation to its debt and other obligations;

• NRG's ability to enter into contracts to sell power and procure fuel on acceptable terms and prices;

• The liquidity and competitiveness of commodities markets;

• Government regulation, including compliance with regulatory requirements and changes in market rules, rates, tariffs and environmental laws and increased regulation of carbon dioxide and other GHG emissions;

• Price mitigation strategies and other market rules employed by ISOs or RTOs that result in a failure to adequately compensate NRG's generation units for all of their costs;

• NRG's ability to borrow additional funds and access capital markets, as well as NRG's substantial indebtedness and the possibility that NRG may incur additional indebtedness going forward;

• NRG's ability to receive loan guarantees or cash grants to support development projects;

• Operating and financial restrictions placed on NRG and its subsidiaries that are contained in the indentures governing NRG's outstanding notes, in NRG's Senior Credit Facility, and in debt and other agreements of certain of NRG subsidiaries and project affiliates generally;

• Cyber terrorism and inadequate cybersecurity, or the occurrence of a catastrophic loss and the possibility that NRG may not have adequate insurance to cover losses resulting from such hazards or the inability of NRG's insurers to provide agreed upon coverage;

• NRG's ability to develop and build new power generation facilities, including new renewable projects;

• NRG's ability to implement its strategy;

• NRG's ability to sell assets to NRG Yield, Inc. and to close drop-down transactions;

• NRG's ability to achieve its strategy of regularly returning capital to stockholders;

• NRG's ability to obtain and maintain retail market share;

• NRG's ability to successfully evaluate investments and achieve intended financial results in new business and growth initiatives;

• NRG's ability to successfully integrate, realize cost savings and manage any acquired businesses; and

• NRG's ability to develop and maintain successful partnering relationships.

Forward-looking statements speak only as of the date they were made, and NRG undertakes no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. The foregoing review of factors that could cause NRG's actual results to differ materially from those contemplated in any forward-looking statements included in this Quarterly Report on Form 10-Q should not be construed as exhaustive.

3

GLOSSARY OF TERMS

When the following terms and abbreviations appear in the text of this report, they have the meanings indicated below:

2014 Form 10-K	NRG’s Annual Report on Form 10-K for the year ended December 31, 2014
Alta Wind Assets	Seven wind facilities that total 947 MWs located in Tehachapi, California and a portfolio of land leases
Ameren	AmerenEnergy Resources Generating Company
ASC	The FASB Accounting Standards Codification, which the FASB established as the source of authoritative U.S. GAAP
ASU	Accounting Standards Updates which reflect updates to the ASC
B2B	Business-to-business, which includes demand response, commodity sales, energy efficiency and energy management services
BACT	Best Available Control Technology
BTU	British Thermal Unit
Buffalo Bear	Buffalo Bear, LLC, the operating subsidiary of Tapestry Wind LLC, which owns the Buffalo Bear project
CAA	Clean Air Act
CAFD	Cash Available For Distribution
CAIR	Clean Air Interstate Rule
CAISO	California Independent System Operator
Capital Allocation Program	NRG's plan of allocating capitalbetween debt reduction, reinvestmentin the business, investment in acquisition opportunities, sharerepurchases and shareholder dividends
CCF	Carbon Capture Facility
CCPI	Clean Coal Power Initiative
CenterPoint	CenterPoint Energy, Inc. and its subsidiaries, on and after August 31, 2002, and Reliant Energy, Incorporated and its subsidiaries prior to August 31, 2002
CFTC	U.S. Commodity Futures Trading Commission
CO2	Carbon Dioxide
COD	Commercial Operations Date
ComEd	Commonwealth Edison
CPS	Combined Pollutant Standard
CPUC	California Public Utilities Commission
CSAPR	Cross-State Air Pollution Rule
CWA	Clean Water Act
Discrete Customers	Customers measured by unit sales of one-time products or services, such as connected home thermostats, portable solar products and portable battery solutions
Distributed Solar	Solar power projects that primarily sell power produced to customers for usage on site, or are interconnected to sell power into the local distribution grid
Dominion	Dominion Resources, Inc.
EME	Edison Mission Energy
Energy Plus Holdings	Energy Plus Holdings LLC and Energy Plus Natural Gas LLC
EPA	U.S. Environmental Protection Agency
EPSA	Electric Power Supply Association
ERCOT	Electric Reliability Council of Texas, the Independent System Operator and the regional reliability coordinator of the various electricity systems within Texas
ESPP	NRG Energy, Inc. Amended and Restated Employee Stock Purchase Plan
Exchange Act	The Securities Exchange Act of 1934, as amended
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission

4

FPA	Federal Power Act
GEM	GenOn Energy Management, LLC
GenConn	GenConn Energy LLC
GenOn	GenOn Energy, Inc.
GenOn Americas Generation	GenOn Americas Generation, LLC
GenOn Americas Generation Senior Notes	GenOn Americas Generation's $850 million outstanding unsecured senior notes consisting of $450 million of 8.50% senior notes due 2021 and $400 million of 9.125% senior notes due 2031
GenOn Mid-Atlantic	GenOn Mid-Atlantic, LLC and, except where the context indicates otherwise, its subsidiaries, which include the coal generation units at two generating facilities under operating leases
GenOn Senior Notes	GenOn's $2.0 billion outstanding unsecured senior notes consisting of $725 million of 7.875% senior notes due 2017, $675 million of 9.5% senior notes due 2018, and $550 million of 9.875% senior notes due 2020
GHG	Greenhouse Gases
GWh	Gigawatt Hour
HAPs	Hazardous Air Pollutants
Heat Rate	A measure of thermal efficiency computed by dividing the total BTU content of the fuel burned by the resulting kWhs generated. Heat rates can be expressed as either gross or net heat rates, depending whether the electricity output measured is gross or net generation and is generally expressed as BTU per net kWh
High Desert	TA - High Desert, LLC
IL CPS	Illinois Combined Pollutant Standard
IPPNY	Independent Power Producers of New York
ISO	Independent System Operator
JX Nippon	JX Nippon Oil Exploration (EOR) Limited
Kansas South	NRG Solar Kansas South LLC
kV	Kilovolts
kWh	Kilowatt-hours
Laredo Ridge	Laredo Ridge Wind, LLC, the operating subsidiary of Mission Wind Laredo, LLC, which owns the Laredo Ridge project
LIBOR	London Inter-Bank Offered Rate
LTIPs	Collectively, the NRG Long-Term Incentive Plan and the NRG GenOn Long-Term Incentive Plan
Marsh Landing	NRG Marsh Landing, LLC (formerly known as GenOn Marsh Landing, LLC)
Mass	Residential and Small Business
MATS	Mercury and Air Toxics Standards promulgated by the EPA
MDE	Maryland Department of the Environment
Midwest Generation	Midwest Generation, LLC
MISO	Midcontinent Independent System Operator, Inc.
MMBtu	Million British Thermal Units
MW	Megawatt
MWh	Saleable megawatt hours, net of internal/parasitic load megawatt-hours
MWt	Megawatts Thermal Equivalent
NAAQS	National Ambient Air Quality Standards
NERC	North American Electric Reliability Corporation
Net Exposure	Counterparty credit exposure to NRG, net of collateral
Net Generation	The net amount of electricity produced, expressed in kWh or MWhs, that is the total amount of electricity generated (gross) minus the amount of electricity used during generation
NEXI	Nippon Export and Investment Insurance
NOL	Net Operating Loss

5

NOV	Notice of Violation
NOx	Nitrogen Oxide
NPNS	Normal Purchase Normal Sale
NRC	U.S. Nuclear Regulatory Commission
NRG Yield	Reporting segment that includes the projects held by NRG Yield, Inc.
NRG Yield, Inc.	NRG Yield, Inc., the owner of 44.7% of NRG Yield LLC with a controlling interest, and issuer of publicly held shares of Class A common stock
NSPS	New Source Performance Standards
NSR	New Source Review
Nuclear Decommissioning Trust Fund	NRG's nuclear decommissioning trust fund assets, which are for the Company's portion of the decommissioning of the STP, units 1 & 2
NYAG	State of New York Office of Attorney General
NYISO	New York Independent System Operator
NYPA	New York Power Authority
NYSPSC	New York State Public Service Commission
OCI	Other Comprehensive Income
PADEP	Pennsylvania Department of Environmental Protection
Peaking	Units expected to satisfy demand requirements during the periods of greatest or peak load on the system
PG&E	Pacific Gas and Electric Company
Pinnacle	Pinnacle Wind, LLC, the operating subsidiary of Tapestry Wind LLC, which owns the Pinnacle project
PJM	PJM Interconnection, LLC
PM	Particulate Matter
POJO	Powerton and Joliet
PPA	Power Purchase Agreement
PPTA	Power Purchase Tolling Agreement
PSD	Prevention of Significant Deterioration
PUCT	Public Utility Commission of Texas
RCRA	Resource Conservation and Recovery Act of 1976
Recurring Customers	Customers that subscribe to one or more recurring services, such as electricity, natural gas and protection products, the majority of which are retail electricity customers in Texas and the Northeast
REMA	NRG REMA LLC (formerly known as GenOn REMA, LLC)
Repowering	Technologies utilized to replace, rebuild, or redevelop major portions of an existing electrical generating facility, generally to achieve a substantial emissions reduction, increase facility capacity, and improve system efficiency
Revolving Credit Facility	The Company's $2.5 billion revolving credit facility due 2018, a component of the Senior Credit Facility
RFP	Request For Proposal
RGGI	Regional Greenhouse Gas Initiative
Right of First Offer Agreement	Right of First Offer Agreement by and between NRG Energy, Inc. and NRG Yield, Inc.
RSSA	Reliability Support Services Agreement
RTO	Regional Transmission Organization
Sabine	Sabine Cogen, L.P.
SDG&E	San Diego Gas & Electric
Senior Credit Facility	NRG's senior secured facility, comprised of the Term Loan Facility and the Revolving Credit Facility

6

Senior Notes	The Company’s $6.4 billion outstanding unsecured senior notes, consisting of $1.1 billion of 7.625% senior notes due 2018, $1.1 billion of 8.25% senior notes due 2020, $1.1 billion of 7.875% senior notes due 2021, $1.1 billion of 6.25% senior notes due 2022, $990 million of 6.625% senior notes due 2023, and $1.0 billion of 6.25% senior notes due 2024
SO2	Sulfur Dioxide
STP	South Texas Project — nuclear generating facility located near Bay City, Texas in which NRG owns a 44% interest
SunPower	SunPower Corporation, Systems
Taloga	Taloga Wind, LLC, the operating subsidiary of Tapestry Wind LLC, which owns the Taloga project
Term Loan Facility	The Company's $2.0 billion term loan facility due 2018, a component of the Senior Credit Facility
Thermal Business	NRG Yield’s thermal business, which consists of thermal infrastructure assets that provide steam, hot water and/or chilled water, and in some instances electricity, tocommercial businesses, universities, hospitals and governmental units
U.S.	United States of America
U.S. DOE	U.S. Department of Energy
U.S. GAAP	Accounting principles generally accepted in the U.S.
Utility Scale Solar	Solar power projects, typically 20 MW or greater in size (on an alternating current basis), that are interconnected into the transmission or distribution grid to sell power at a wholesale level
VaR	Value at Risk
VIE	Variable Interest Entity
Walnut Creek	NRG Walnut Creek, LLC, the operating subsidiary of WCEP Holdings, LLC, which owns the Walnut Creek project
Yield Operating	NRG Yield Operating LLC

7

PART I — FINANCIAL INFORMATION

ITEM 1 — CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND NOTES

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited)

	Three months ended March 31,
(In millions, except for per share amounts)	2015			2014
Operating Revenues
Total operating revenues	$	3,826		$	3,486
Operating Costs and Expenses
Cost of operations	3,062			2,737
Depreciation and amortization	395			335
Selling, general and administrative	263			222
Acquisition-related transaction and integration costs	10			12
Development activity expenses	34			19
Total operating costs and expenses	3,764			3,325
Gain on postretirement benefits curtailment and sale of assets	14			19
Operating Income	76			180
Other Income/(Expense)
Equity in (loss)/earnings of unconsolidated affiliates	(3		)	7
Other income, net	19			11
Loss on debt extinguishment	—			(41		)
Interest expense	(301		)	(255		)
Total other expense	(285		)	(278		)
Loss Before Income Taxes	(209		)	(98		)
Income tax benefit	(73		)	(31		)
Net Loss	(136		)	(67		)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	(16		)	(11		)
Net Loss Attributable to NRG Energy, Inc.	(120		)	(56		)
Dividends for preferred shares	5			2
Loss Available for Common Stockholders	$	(125	)	$	(58	)
Loss per Share Attributable to NRG Energy, Inc. Common Stockholders
Weighted average number of common shares outstanding — basic and diluted	336			324
Loss per Weighted Average Common Share — Basic and Diluted	$	(0.37	)	$	(0.18	)
Dividends Per Common Share	$	0.15		$	0.12

See accompanying notes to condensed consolidated financial statements.

8

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS)

(Unaudited)

	Three months ended March 31,
	2015			2014
	(In millions)
Net Loss	$	(136	)	$	(67	)
Other Comprehensive (Loss)/Income, net of tax
Unrealized loss on derivatives, net of income tax benefit of $6 and $3	(12		)	(9		)
Foreign currency translation adjustments, net of income tax (benefit)/expense of $(7) and $2	(11		)	6
Available-for-sale securities, net of income tax (benefit)/expense of $(4) and $2	(1		)	6
Defined benefit plans, net of tax expense of $4 and $0	7			2
Other comprehensive (loss)/income	(17		)	5
Comprehensive Loss	(153		)	(62		)
Less: Comprehensive loss attributable to noncontrolling interest and redeemable noncontrolling interests	(29		)	(15		)
Comprehensive Loss Attributable to NRG Energy, Inc.	(124		)	(47		)
Dividends for preferred shares	5			2
Comprehensive Loss Available for Common Stockholders	$	(129	)	$	(49	)

See accompanying notes to condensed consolidated financial statements.

9

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

	March 31, 2015			December 31, 2014
(In millions, except shares)	(unaudited)
ASSETS
Current Assets
Cash and cash equivalents	$	2,164		$	2,116
Funds deposited by counterparties	68			72
Restricted cash	443			457
Accounts receivable — trade, less allowance for doubtful accounts of $21 and $23	1,179			1,322
Inventory	1,109			1,247
Derivative instruments	2,029			2,425
Cash collateral paid in support of energy risk management activities	400			187
Deferred income taxes	188			174
Renewable energy grant receivable, net	68			135
Prepayments and other current assets	474			447
Total current assets	8,122			8,582
Property, plant and equipment, net of accumulated depreciation of $8,261 and $7,890	22,276			22,367
Other Assets
Equity investments in affiliates	772			771
Notes receivable, less current portion	67			72
Goodwill	2,520			2,574
Intangible assets, net of accumulated amortization of $1,511 and $1,402	2,491			2,567
Nuclear decommissioning trust fund	586			585
Derivative instruments	591			480
Deferred income taxes	1,484			1,406
Non-current assets held-for-sale	17			17
Other non-current assets	1,404			1,244
Total other assets	9,932			9,716
Total Assets	$	40,330		$	40,665
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	465		$	474
Accounts payable	1,045			1,060
Derivative instruments	1,884			2,054
Cash collateral received in support of energy risk management activities	68			72
Accrued expenses and other current liabilities	1,047			1,199
Total current liabilities	4,509			4,859
Other Liabilities
Long-term debt and capital leases	20,050			19,900
Nuclear decommissioning reserve	314			310
Nuclear decommissioning trust liability	328			333
Deferred income taxes	20			21
Derivative instruments	650			438
Out-of-market contracts, net of accumulated amortization of $585 and $562	1,221			1,244
Other non-current liabilities	1,549			1,574
Total non-current liabilities	24,132			23,820
Total Liabilities	28,641			28,679
2.822% convertible perpetual preferred stock	293			291
Redeemable noncontrolling interest in subsidiaries	19			19
Commitments and Contingencies
Stockholders’ Equity
Common stock	4			4
Additional paid-in capital	8,362			8,327
Retained earnings	3,413			3,588
Less treasury stock, at cost — 81,865,411 and 78,843,552 shares, respectively	(2,059		)	(1,983		)
Accumulated other comprehensive loss	(191		)	(174		)
Noncontrolling interest	1,848			1,914
Total Stockholders’ Equity	11,377			11,676
Total Liabilities and Stockholders’ Equity	$	40,330		$	40,665

See accompanying notes to condensed consolidated financial statements.

10

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Three months ended March 31,
	2015			2014
	(In millions)
Cash Flows from Operating Activities
Net loss	$	(136	)	$	(67	)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates	32			(2		)
Depreciation and amortization	395			335
Provision for bad debts	15			21
Amortization of nuclear fuel	13			11
Amortization of financing costs and debt discount/premiums	(4		)	(5		)
Adjustment for debt extinguishment	—			19
Amortization of intangibles and out-of-market contracts	19			13
Amortization of unearned equity compensation	11			8
Changes in deferred income taxes and liability for uncertain tax benefits	(83		)	(111		)
Changes in nuclear decommissioning trust liability	(3		)	5
Changes in derivative instruments	261			525
Changes in collateral deposits supporting energy risk management activities	(213		)	(407		)
Gain on postretirement benefits curtailment and sale of assets	(14		)	(19		)
Cash used by changes in other working capital	(33		)	65
Net Cash Provided by Operating Activities	260			391
Cash Flows from Investing Activities
Acquisitions of businesses, net of cash acquired	(1		)	(218		)
Capital expenditures	(252		)	(237		)
(Increase)/decrease in restricted cash, net	(11		)	3
Decrease in restricted cash to support equity requirements for U.S. DOE funded projects	25			56
Decrease in notes receivable	5			1
Investments in nuclear decommissioning trust fund securities	(193		)	(188		)
Proceeds from the sale of nuclear decommissioning trust fund securities	196			183
Proceeds from renewable energy grants and state rebates	2			387
Proceeds from sale of assets, net of cash disposed of	—			77
Cash proceeds to fund cash grant bridge loan payment	—			57
Other	(41		)	3
Net Cash (Used)/Provided by Investing Activities	(270		)	124
Cash Flows from Financing Activities
Payment of dividends to common and preferred stockholders	(51		)	(41		)
Payment for treasury stock	(79		)	—
Net receipts from/(payments for) settlement of acquired derivatives that include financing elements	40			(223		)
Proceeds from issuance of long-term debt	248			1,564
Contributions to, net of distributions from, noncontrolling interest in subsidiaries	(25		)	9
Proceeds from issuance of common stock	1			3
Payment of debt issuance costs	—			(23		)
Payments for short and long-term debt	(94		)	(873		)
Net Cash Provided by Financing Activities	40			416
Effect of exchange rate changes on cash and cash equivalents	18			2
Net Increase in Cash and Cash Equivalents	48			933
Cash and Cash Equivalents at Beginning of Period	2,116			2,254
Cash and Cash Equivalents at End of Period	$	2,164		$	3,187

See accompanying notes to condensed consolidated financial statements.

11

NRG ENERGY, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1 — Basis of Presentation

NRG Energy, Inc., or NRG or the Company, is a competitive power company, which produces, sells and delivers energy and energy products and services in major competitive power markets primarily in the U.S. while positioning itself as a leader in the way residential, industrial and commercial consumers think about and use energy products and services. NRG is responding to a consumer-driven change to the U.S. energy industry by offering cleaner, smarter and ultimately more portable energy while enabling personal energy choice, building on the strength of one of the nation’s largest and most diverse competitive power generation portfolios. The Company owns and operates approximately 51,000 MWs of generation; engages in the trading of wholesale energy, capacity and related products; transacts in and trades fuel and transportation services; and directly sells energy, services, and innovative, sustainable products and services to retail customers under the name “NRG” and various other retail brand names owned by NRG.

The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements in the Company's 2014 Form 10-K. Interim results are not necessarily indicative of results for a full year.

In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of March 31, 2015, and the results of operations, comprehensive income/(loss) and cash flows for the three months ended March 31, 2015, and 2014.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Reclassifications

Certain prior year amounts have been reclassified for comparative purposes. The reclassifications did not affect results from operations or cash flows.

Note 2 — Summary of Significant Accounting Policies

Other Cash Flow Information

NRG’s investing activities exclude capital expenditures of $40 million which were accrued and unpaid at March 31, 2015.

Noncontrolling Interest

The following table reflects the changes in NRG's noncontrolling interest balance:

	(In millions)
Balance as of December 31, 2014	$	1,914
Sale of assets to NRG Yield, Inc.	(27		)
Distributions to noncontrolling interest	(24		)
Non-cash increase to noncontrolling interest	14
Comprehensive loss attributable to noncontrolling interest	(29		)
Balance as of March 31, 2015	$	1,848

12

NRG RPV Holdco 1 LLC

In April 2015, NRG and NRG Yield, Inc. announced the formation of a partnership that will invest in and hold operating portfolios of residential solar assets developed by NRG Home Solar, including: (i) an existing, unlevered portfolio of over 2,200 leases across nine states representing approximately 17 MW with a weighted average remaining lease term of approximately 17 years which NRG Yield, Inc. invested $26 million in April 2015; (ii) an in-development, tax equity financed portfolio of between 6,000 to 7,000 leases across at least 10 states representing approximately 48 MW with a lease term of 20 years; and (iii) an in-development tax equity financed portfolio of 5,500 to 6,500 leases representing approximately 42 MW with a lease term of 20 years. As part of the agreement, NRG will periodically monetize its residential leases through equity investments by NRG Yield, Inc. in NRG RPV Holdco 1 LLC. NRG will retain a 5% residual economic interest in the portfolio and act as managing member of the partnership. Allocations of income and cash will be 5% to NRG and 95% to NRG Yield, Inc. over the contracted life of the investments. Once NRG Yield, Inc. reaches its expected return on its investment, which is expected to be achieved consistent with the expiry of the remaining lease term, allocations of income and cash thereafter will be 95% to NRG and 5% to NRG Yield, Inc. NRG also has an option to purchase NRG Yield, Inc.'s interest at fair value after the flip date occurs. NRG Yield, Inc. has committed to invest up to an additional $150 million of cash contributions into the partnership over time, excluding the $26 million noted above.

Redeemable Noncontrolling Interest in Subsidiaries

Redeemable noncontrolling interest in subsidiaries represents third-party interests in the net assets under certain arrangements that the Company has entered into to finance the cost of solar energy systems under operating leases and wind facilities eligible for certain tax credits.  To the extent that the third-party has the right to redeem their interests for cash or other assets, the Company has included the noncontrolling interest attributable to the third party as a component of temporary equity in the mezzanine section of the consolidated balance sheet. During the three months ended March 31, 2015, changes in redeemable noncontrolling interest were immaterial and resulted from contributions from and allocated losses attributable to redeemable noncontrolling interests. As of March 31, 2015 and December 31, 2014, the Company's redeemable noncontrolling interest balance was $19 million.

Gain on Postretirement Benefits Curtailment

During the first quarter of 2015, the Company recognized a gain of $14 million related to the curtailment of certain of the Company's postretirement plans.

Recent Accounting Developments

ASU 2015-03 — In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, or ASU No. 2015-03. The amendments of ASU No. 2015-03 were issued to reduce complexity in the balance sheet presentation of debt issuance costs. ASU No. 2015-03 requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this standard. The guidance in ASU No. 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this standard is not expected to have a material impact on the Company's balance sheets on a gross basis and will have no impact on net assets.

ASU 2015-02 — In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, or ASU No. 2015-02. The amendments of ASU No. 2015-02 were issued in an effort to minimize situations under previously existing guidance in which a reporting entity was required to consolidate another legal entity in which that reporting entity did not have: (1) the ability through contractual rights to act primarily on its own behalf; (2) ownership of the majority of the legal entity's voting rights; or (3) the exposure to a majority of the legal entity's economic benefits. ASU No. 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The guidance in ASU No. 2015-02 is effective for periods beginning after December 15, 2015. Early adoption is permitted. The Company adopted the standard effective January 1, 2015 and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position.

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ASU 2014-16 — In November 2014, the FASB issued ASU No. 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity, or ASU No. 2014-16. The amendments of ASU No. 2014-16 clarify how U.S. GAAP should be applied in determining whether the nature of a host contract is more akin to debt or equity and in evaluating whether the economic characteristics and risks of an embedded feature are "clearly and closely related" to its host contract. The guidance in ASU No. 2014-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company adopted the standard effective January 1, 2015 and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position.

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.

Note 3 — Business Acquisitions and Dispositions

The Company has completed the following business acquisitions and dispositions that are material to the Company's financial statements:

2015 Dispositions

Sale of Assets to NRG Yield, Inc.

On January 2, 2015, the Company sold the following facilities to NRG Yield, Inc.: Walnut Creek, the Tapestry projects (Buffalo Bear, Pinnacle and Taloga) and Laredo Ridge. NRG Yield, Inc. paid total cash consideration of $489 million, including $9 million of working capital adjustments, plus assumed project level debt of $737 million. The sale was recorded as a transfer of entities under common control and the related assets were transferred at carrying value of $405 million.

2014 Acquisitions and Dispositions

Sale of Sabine

On December 2, 2014, the Company, through its subsidiaries GenOn Sabine (Delaware), Inc. and GenOn Sabine (Texas), Inc., completed the sale of its 50% interest in Sabine to Bayou Power, LLC, an affiliate of Rockland Capital, LLC. Sabine owns a 105 MW natural gas-fired cogeneration facility located in Texas. The Company received cash consideration of $35 million at closing. A gain of $18 million was recognized as a result of the transaction and recorded as a gain on sale of equity-method investments within the Company's consolidated statements of operations.

Acquisition of Alta Wind

On August 12, 2014, NRG Yield, Inc., through its subsidiary Yield Operating, completed the acquisition of 100% of the membership interests of Alta Wind Asset Management Holdings, LLC, Alta Wind Company, LLC, Alta Wind X Holding Company, LLC, and Alta Wind XI Holding Company, LLC, which collectively own seven wind facilities that total 947 MWs located in Tehachapi, California and a portfolio of land leases, or the Alta Wind Assets. Power generated by the Alta Wind facilities is sold to Southern California Edison under long-term power purchase agreements, with 21 years of remaining contract life for Alta I-V. The Alta X and XI power purchase agreements begin in 2016 with a term of 22 years and currently sell energy and renewable energy credits on a merchant basis.

The purchase price of the Alta Wind Assets was $923 million, which was comprised of purchase price of $870 million and $53 million paid for working capital balances. In order to fund the purchase price of the acquisition, NRG Yield, Inc. issued 12,075,000 shares of its Class A common stock on July 29, 2014, for net proceeds of $630 million. In addition, on August 5, 2014, Yield Operating issued $500 million in aggregate principal amount at par of 5.375% senior notes due August 2024. Interest on the notes is payable semi-annually on February 15 and August 15 of each year, and commenced on February 15, 2015. The notes are senior unsecured obligations of Yield Operating and are guaranteed by NRG Yield LLC, Yield Operating’s parent company, and by certain of Yield Operating’s wholly owned subsidiaries.

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The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The initial accounting for the business combination is not complete because the evaluation necessary to assess the fair values of certain net assets acquired is still in process. The provisional amounts are subject to revision until the evaluations are completed to the extent that additional information is obtained about the facts and circumstances that existed as of the acquisition date. The allocation of the purchase price may be modified up to one year from the date of the acquisition as more information is obtained about the fair value of assets acquired and liabilities assumed. The following table summarizes the provisional amounts recognized for assets acquired and liabilities assumed as of December 31, 2014, as well as adjustments made through March 31, 2015. The purchase price of $923 million was provisionally allocated as follows:

	Acquisition Date Fair Value at December 31, 2014		Measurement period adjustments			Revised Acquisition Date
	(In millions)
Assets
Cash	$	22	$	—		$	22
Current and non-current assets	49		(2		)	47
Property, plant and equipment	1,304		6			1,310
Intangible assets	1,177		(6		)	1,171
Total assets acquired	2,552		(2		)	2,550
Liabilities
Debt	1,591		—			1,591
Current and non-current liabilities	38		(2		)	36
Total liabilities assumed	1,629		(2		)	1,627
Net assets acquired	$	923	$	—		$	923

Disposition of 50% Interest in Petra Nova Parish Holdings LLC

On July 3, 2014, the Company, through its wholly owned subsidiary Petra Nova Holdings LLC, sold 50% of its interest in Petra Nova Parish Holdings LLC to JX Nippon Oil Exploration (EOR) Limited, JX Nippon, a wholly owned subsidiary of JX Nippon Oil & Gas Exploration Corporation.  As a result of the sale, the Company no longer has a controlling interest in and has deconsolidated Petra Nova Parish Holdings LLC as of the date of the sale. On July 7, 2014, the Company made its initial capital contribution into the partnership of $35 million, which was funded with a portion of the sale proceeds of $76 million. On March 3, 2014, Petra Nova CCS I LLC, a wholly owned subsidiary of Petra Nova Parish Holdings LLC, entered into a fixed-price agreement to build and operate a CCF at the W.A. Parish facility with a consortium of Mitsubishi Heavy Industries America, Inc. and TIC - The Industrial Company.  Notice to proceed for the construction on the CCF was issued on July 15, 2014, and commercial operation is expected in late 2016. 

Petra Nova Parish Holdings LLC also owns a 75 MW peaking unit at W.A. Parish, which achieved commercial operations on June 26, 2013. The peaking unit will be converted into a cogeneration facility to provide power and steam to the CCF.  The project is being financed by: (i) up to $167 million from a U.S. DOE CCPI grant, (ii) $250 million in loans provided by the Japan Bank for International Cooperation and Mizuho Bank, Ltd., and (iii) approximately $300 million in equity contributions from each of the Company and JX Nippon. NRG’s contribution will include investments already made during the development of the project. 

Sale of Assets to NRG Yield, Inc.

On June 30, 2014, the Company sold the following facilities to NRG Yield, Inc.: High Desert, Kansas South, and El Segundo Energy Center. NRG Yield, Inc. paid total cash consideration of $357 million, which represents a base purchase price of $349 million and $8 million of working capital adjustments, plus assumed project level debt of approximately $612 million. The sale was recorded as a transfer of entities under common control and the related assets were transferred at carrying value of $236 million.

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Acquisition of Dominion's Competitive Electric Retail Business

On March 31, 2014, the Company acquired the competitive retail electricity business of Dominion. The acquisition of Dominion's competitive retail electricity business increased NRG’s retail portfolio by approximately 540,000 customers in the aggregate by the end of 2014. The acquisition supports NRG's ongoing efforts to expand the Company's retail footprint in the Northeast and to grow its retail position in Texas. The Company paid approximately $192 million as cash consideration for the acquisition, including $165 million of purchase price and $27 million paid for working capital balances, which was funded by cash on hand. The purchase price was allocated to the following: $40 million to accounts receivable-trade, $64 million to customer relationships, $9 million to trade names, $14 million to current assets, $21 million to derivative assets, $47 million to current and non-current liabilities, and goodwill of $91 million of which $8 million is deductible for U.S. income tax purposes in future periods. The factors that resulted in goodwill arising from the acquisition include the revenues associated with new customers in new regions and through the synergies associated with combining a new retail business with the Company's existing retail and generation assets. The assets acquired and liabilities assumed are included within the NRG Home Retail segment. The accounting for the Dominion acquisition was completed as of March 30, 2015, at which point the provisional fair values became final with no material changes.

EME Acquisition

On April 1, 2014, the Company acquired substantially all of the assets of EME.  EME, through its subsidiaries and affiliates, owned or leased and operated a portfolio of approximately 8,000 MW consisting of wind energy facilities and coal- and gas-fired generating facilities. The Company paid an aggregate purchase price of $3.5 billion, which was funded through the issuance of 12,671,977shares of NRG common stock on April 1, 2014, the issuance of $700 million in newly-issued corporate debt and cash on hand. The Company also assumed non-recourse debt of approximately $1.2 billion. 

In connection with the transaction, NRG agreed to certain conditions with the parties to the POJO sale-leaseback transaction subject to which an NRG subsidiary assumed the POJO leveraged leases and NRG guaranteed the remaining payments under each lease, which total $405 million through 2034. In connection with this agreement, NRG has committed to fund up to $350 million in capital expenditures for plant modifications at Powerton and Joliet to comply with environmental regulations, as discussed further in Note 15, Environmental Matters.

The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The accounting for the EME acquisition was completed as of March 31, 2015, at which point the fair values became final. The following table summarizes the provisional amounts recognized for assets acquired and liabilities assumed as of December 31, 2014, as well as adjustments made through March 31, 2015, when the allocation became final. Measurement period adjustments primarily reflect the tax impact of the acquisition date fair values and final estimates for asset retirement obligations. The purchase price of $3.5 billion was allocated as follows:

	Acquisition Date Fair Value at December 31, 2014		Measurement period adjustments			Revised Acquisition Date
	(In millions)
Assets
Cash	$	1,422	$	—		$	1,422
Current assets	724		72			796
Property, plant and equipment	2,438		(3		)	2,435
Intangible assets	172		—			172
Goodwill	334		(56		)	278
Non-current assets	773		—			773
Total assets acquired	5,863		13			5,876
Liabilities
Current and non-current liabilities	629		13			642
Out-of-market contracts and leases	159		—			159
Long-term debt	1,249		—			1,249
Total liabilities assumed	2,037		13			2,050
Less: noncontrolling interest	352		—			352
Net assets acquired	$	3,474	$	—		$	3,474

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Note 4 — Fair Value of Financial Instruments

This footnote should be read in conjunction with the complete description under Note 4, Fair Value of Financial Instruments, to the Company's 2014 Form 10-K.

For cash and cash equivalents, funds deposited by counterparties, accounts and other receivables, accounts payable, restricted cash, and cash collateral paid and received in support of energy risk management activities, the carrying amount approximates fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.

The estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value are as follows:

	As of March 31, 2015				As of December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Assets:
Notes receivable (a)	$	86	$	86	$	91	$	91
Liabilities:
Long-term debt, including current portion	$	20,509	$	20,679	$	20,366	$	20,361

(a) Includes the current portion of notes receivable which is recorded in prepayments and other current assets on the Company's consolidated balance sheets.

The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non publicly-traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy.

Recurring Fair Value Measurements

Debt securities, equity securities, and trust fund investments, which are comprised of various U.S. debt and equity securities, and derivative assets and liabilities, are carried at fair market value.

The following tables present assets and liabilities measured and recorded at fair value on the Company's condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:

	As of March 31, 2015
	Fair Value
(In millions)	Level 1		Level 2		Level 3		Total
Investment in available-for-sale securities (classified within other     non-current assets):
Debt securities	$	—	$	—	$	18	$	18
Available-for-sale securities	24		—		—		24
Other (a)	20		—		11		31
Nuclear trust fund investments:
Cash and cash equivalents	5		—		—		5
U.S. government and federal agency obligations	50		3		—		53
Federal agency mortgage-backed securities	—		71		—		71
Commercial mortgage-backed securities	—		24		—		24
Corporate debt securities	—		84		—		84
Equity securities	293		—		54		347
Foreign government fixed income securities	—		2		—		2
Other trust fund investments:
U.S. government and federal agency obligations	1		—		—		1
Derivative assets:
Commodity contracts	998		1,358		264		2,620
Total assets	$	1,391	$	1,542	$	347	$	3,280
Derivative liabilities:
Commodity contracts	$	964	$	1,142	$	230	$	2,336
Interest rate contracts	—		198		—		198
Total liabilities	$	964	$	1,340	$	230	$	2,534

(a) Consists primarily of mutual funds held in a Rabbi Trust for non-qualified deferred compensation plans for certain former employees and a total return swap that does not meet the definition of a derivative.

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	As of December 31, 2014
	Fair Value
(In millions)	Level 1		Level 2		Level 3		Total
Investment in available-for-sale securities (classified within other non-current assets):
Debt securities	$	—	$	—	$	18	$	18
Available-for-sale securities	30		—		—		30
Other (a)	21		—		11		32
Nuclear trust fund investments:
Cash and cash equivalents	14		—		—		14
U.S. government and federal agency obligations	44		3		—		47
Federal agency mortgage-backed securities	—		74		—		74
Commercial mortgage-backed securities	—		25		—		25
Corporate debt securities	—		78		—		78
Equity securities	292		—		52		344
Foreign government fixed income securities	—		3		—		3
Other trust fund investments:
U.S. government and federal agency obligations	1		—		—		1
Derivative assets:
Commodity contracts	1,078		1,515		309		2,902
Interest rate contracts	—		2		—		2
Equity contracts	—		—		1		1
Total assets	$	1,480	$	1,700	$	391	$	3,571
Derivative liabilities:
Commodity contracts	$	1,004	$	1,093	$	230	$	2,327
Interest rate contracts	—		165		—		165
Total liabilities	$	1,004	$	1,258	$	230	$	2,492

(a) Primarily consists of mutual funds held in rabbi trusts for non-qualified deferred compensation plans for certain former employees.

There were no transfers during the three months ended March 31, 2015, and 2014 between Levels 1 and 2. The following tables reconcile, for the three months ended March 31, 2015, and 2014, the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended March 31, 2015
(In millions)	Debt Securities		Other		Trust Fund Investments		Derivatives(a)			Total
Beginning balance	$	18	$	11	$	52	$	80		$	161
Total gains/(losses) — realized/unrealized:
Included in earnings	—		—		—		(55		)	(55		)
Included in nuclear decommissioning obligation	—		—		2		—			2
Purchases	—		—		—		(4		)	(4		)
Transfers into Level 3 (b)	—		—		—		15			15
Transfers out of Level 3 (b)	—		—		—		(2		)	(2		)
Ending balance as of March 31, 2015	$	18	$	11	$	54	$	34		$	117
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2015	$	—	$	—	$	—	(20		)	$	(20	)

(a) Consists of derivative assets and liabilities, net.

(b) Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

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	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended March 31, 2014
(In millions)	Debt Securities		Other		Trust Fund Investments		Derivatives(a)			Total
Beginning balance	$	16	$	10	$	56	$	13		$	95
Total gains/(losses) — realized/unrealized:
Included in earnings	—		1		—		16			17
Included in OCI	2		—		—		—			2
Purchases	—		—		—		(21		)	(21		)
Contracts acquired in Dominion acquisition	—		—		—		3			3
Transfers into Level 3 (b)	—		—		—		18			18
Transfers out of Level 3 (b)	—		—		—		(6		)	(6		)
Ending balance as of March 31, 2014	$	18	$	11	$	56	$	23		$	108
Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2014	—		—		—		19			19

(a) Consists of derivative assets and liabilities, net.

(b) Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

Realized and unrealized gains and losses included in earnings that are related to energy derivatives are recorded in operating revenues and cost of operations.

Derivative Fair Value Measurements

A portion of NRG's contracts are exchange-traded contracts with readily available quoted market prices. A majority of NRG's contracts are non-exchange-traded contracts valued using prices provided by external sources, primarily price quotations available through brokers or over-the-counter and on-line exchanges. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available for the whole term or for certain delivery months or the contracts are retail and load following power contracts. These contracts are valued using various valuation techniques including but not limited to internal models that apply fundamental analysis of the market and corroboration with similar markets. As of March 31, 2015, contracts valued with prices provided by models and other valuation techniques make up 10% of the total derivative assets and 9% of the total derivative liabilities.

The fair value of each contract is discounted using a risk free interest rate. In addition, the Company applies a credit reserve to reflect credit risk which is calculated based on published default probabilities. As of March 31, 2015, the credit reserve resulted in a $5 million increase in fair value which is composed of a $3 million gain in OCI and a $2 million gain in operating revenue and cost of operations. As of March 31, 2014, the credit reserve was not a material amount.

Concentration of Credit Risk

In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Company's 2014 Form 10-K, the following is a discussion of the concentration of credit risk for the Company's contractual obligations. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. NRG is exposed to counterparty credit risk through various activities including wholesale sales, fuel purchases and retail supply arrangements, and retail customer credit risk through its retail load activities.

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Counterparty Credit Risk

The Company's counterparty credit risk policies are disclosed in its 2014 Form 10-K. As of March 31, 2015, counterparty credit exposure, excluding credit risk exposure under certain long term agreements, was $842 million and NRG held collateral (cash and letters of credit) against those positions of $84 million, resulting in a net exposure of $763 million. Approximately 91% of the Company's exposure before collateral is expected to roll off by the end of 2016. Counterparty credit exposure is valued through observable market quotes and discounted at a risk free interest rate. The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for NRG with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market and NPNS, and non-derivative transactions. The exposure is shown net of collateral held, and includes amounts net of receivables or payables.

	Net Exposure (a)
Category	(% of Total)
Financial institutions	48	%
Utilities, energy merchants, marketers and other	32
ISOs	20
Total as of March 31, 2015	100	%

	Net Exposure (a)
Category	(% of Total)
Investment grade	96	%
Non-rated (b)	2
Non-investment grade	2
Total as of March 31, 2015	100	%

(a) Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices.

(b) For non-rated counterparties, a significant portion are related to ISO and municipal public power entities, which are considered investment grade equivalent ratings based on NRG's internal credit ratings.

NRG has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of total net exposure discussed above. The aggregate of such counterparties' exposure was $290 million as of March 31, 2015. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration. Given the credit quality, diversification and term of the exposure in the portfolio, NRG does not anticipate a material impact on the Company's financial position or results of operations from nonperformance by any of NRG's counterparties.

Counterparty credit exposure described above excludes credit risk exposure under certain long term agreements, including California tolling agreements, Gulf Coast load obligations, wind and solar PPAs, and a coal supply agreement. As external sources or observable market quotes are not available to estimate such exposure, the Company estimates its credit exposure for these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Based on these valuation techniques, as of March 31, 2015, aggregate credit risk exposure managed by NRG to these counterparties was approximately $3.3 billion, including $2.3 billion related to assets of NRG Yield, Inc., for the next five years. This amount excludes potential credit exposures for projects with long-term PPAs that have not reached commercial operations. The majority of these power contracts are with utilities or public power entities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations and other technology and market factors, which NRG is unable to predict. In the case of the coal supply agreement, NRG holds a lien against the underlying asset which significantly reduces the risk of loss.

Retail Customer Credit Risk

NRG is exposed to retail credit risk through the Company's retail electricity providers, which serve commercial, industrial and governmental/institutional customers and the Mass market. Retail credit risk results when a customer fails to pay for products or services rendered. The losses may result from both nonpayment of customer accounts receivable and the loss of in-the-money forward value. NRG manages retail credit risk through the use of established credit policies that include monitoring of the portfolio, and the use of credit mitigation measures such as deposits or prepayment arrangements.

As of March 31, 2015, the Company believes its retail customer credit exposure was diversified across many customers and various industries, as well as government entities.

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Note 5 — Nuclear Decommissioning Trust Fund

This footnote should be read in conjunction with the complete description under Note 6, Nuclear Decommissioning Trust Fund, to the Company's 2014 Form 10-K.

NRG's Nuclear Decommissioning Trust Fund assets are comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounts for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations, because the Company's nuclear decommissioning activities are subject to approval by the PUCT with regulated rates that are designed to recover all decommissioning costs and that can be charged to and collected from the ratepayers per PUCT mandate. Since the Company is in compliance with PUCT rules and regulations regarding decommissioning trusts and the cost of decommissioning is the responsibility of the Texas ratepayers, not NRG, all realized and unrealized gains or losses (including other-than-temporary impairments) related to the Nuclear Decommissioning Trust Fund are recorded to nuclear decommissioning trust liability and are not included in net income or accumulated other comprehensive income, consistent with regulatory treatment.

The following table summarizes the aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held in the trust funds, as well as information about the contractual maturities of those securities.

	As of March 31, 2015							As of December 31, 2014
(In millions, except otherwise noted)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)
Cash and cash equivalents	$	5	$	—	$	—	—	$	14	$	—	$	—	—
U.S. government and federal agency obligations	53		3		—		10	47		2		—		11
Federal agency mortgage-backed securities	71		2		—		24	74		2		—		25
Commercial mortgage-backed securities	24		—		1		30	25		—		1		30
Corporate debt securities	84		2		—		10	78		2		1		11
Equity securities	347		211		—		—	344		211		—		—
Foreign government fixed income securities	2		—		—		15	3		1		—		16
Total	$	586	$	218	$	1		$	585	$	218	$	2

The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method.

	Three months ended March 31,
	2015		2014
	(In millions)
Realized gains	$	6	$	3
Realized losses	2		1
Proceeds from sale of securities	196		183

21

Note 6 — Accounting for Derivative Instruments and Hedging Activities

This footnote should be read in conjunction with the complete description under Note 5, Accounting for Derivative Instruments and Hedging Activities, to the Company's 2014 Form 10-K.

Energy-Related Commodities

As of March 31, 2015, NRG had energy-related derivative instruments extending through 2024. The Company voluntarily de-designated all remaining commodity cash flow hedges as of January 1, 2014, and prospectively marked these derivatives to market through the income statement.

Interest Rate Swaps

NRG is exposed to changes in interest rates through the Company's issuance of variable and fixed rate debt. In order to manage the Company's interest rate risk, NRG enters into interest rate swap agreements. As of March 31, 2015, the Company had interest rate derivative instruments on non-recourse debt extending through 2032, most of which are designated as cash flow hedges.

Volumetric Underlying Derivative Transactions

The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception as of March 31, 2015, and December 31, 2014. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.

		Total Volume
		March 31, 2015			December 31, 2014
Category	Units	(In millions)
Emissions	Short Ton	4			2
Coal	Short Ton	48			57
Natural Gas	MMBtu	(35		)	(58		)
Oil	Barrel	1			1
Power	MWh	(52		)	(56		)
Capacity	MW/Day	(1		)	—
Interest	Dollars	$	3,399		$	3,440
Equity	Shares	2			2

Fair Value of Derivative Instruments

The following table summarizes the fair value within the derivative instrument valuation on the balance sheets:

	Fair Value
	Derivative Assets				Derivative Liabilities
	March 31, 2015		December 31, 2014		March 31, 2015		December 31, 2014
	(In millions)
Derivatives designated as cash flow hedges:
Interest rate contracts current	$	—	$	—	$	51	$	55
Interest rate contracts long-term	—		2		97		74
Commodity contracts current	—		—		—		—
Commodity contracts long-term	—		—		—		—
Total derivatives designated as cash flow hedges	—		2		148		129
Derivatives not designated as cash flow hedges:
Interest rate contracts current	—		—		9		8
Interest rate contracts long-term	—		—		41		28
Commodity contracts current	2,029		2,425		1,824		1,991
Commodity contracts long-term	591		477		512		336
Equity contracts long-term	—		1		—		—
Total derivatives not designated as cash flow hedges	2,620		2,903		2,386		2,363
Total derivatives	$	2,620	$	2,905	$	2,534	$	2,492

22

The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. In addition, collateral received or paid on the Company's derivative assets or liabilities are recorded on a separate line item on the balance sheet. The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:

	Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted			Net Amount
As of March 31, 2015	(In millions)
Commodity contracts:
Derivative assets	$	2,620		$	(2,092	)	$	(64	)	$	464
Derivative liabilities	(2,336		)	2,092			55			(189		)
Total commodity contracts	284			—			(9		)	275
Interest rate contracts:
Derivative liabilities	(198		)	—			—			(198		)
Total derivative instruments	$	86		$	—		$	(9	)	$	77

	Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted			Net Amount
As of December 31, 2014	(In millions)
Commodity contracts:
Derivative assets	$	2,902		$	(2,155	)	$	(72	)	$	675
Derivative liabilities	(2,327		)	2,155			27			(145		)
Total commodity contracts	575			—			(45		)	530
Interest rate contracts:
Derivative assets	2			(2		)	—			—
Derivative liabilities	(165		)	2			—			(163		)
Total interest rate contracts	(163		)	—			—			(163		)
Equity contracts:
Derivative assets	1			—			—			1
Total derivative instruments	$	413		$	—		$	(45	)	$	368

Accumulated Other Comprehensive Loss

The following table summarizes the effects of ASC 815 on the Company's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax:

	Three months ended March 31, 2015
	Energy Commodities			Interest Rate			Total
	(In millions)
Accumulated OCI beginning balance	$	(1	)	$	(67	)	$	(68	)
Reclassified from accumulated OCI to income:
Due to realization of previously deferred amounts	—			2			2
Mark-to-market of cash flow hedge accounting contracts	—			(18		)	(18		)
Accumulated OCI ending balance, net of $50 tax	$	(1	)	$	(83	)	$	(84	)
Losses expected to be realized from OCI during the next 12 months, net of $7 tax	$	(1	)	$	(13	)	$	(14	)

23

	Three months ended March 31, 2014
	Energy Commodities			Interest Rate			Total
	(In millions)
Accumulated OCI beginning balance	$	(1	)	$	(22	)	$	(23	)
Reclassified from accumulated OCI to income:
Due to realization of previously deferred amounts	—			(1		)	(1		)
Mark-to-market of cash flow hedge accounting contracts	—			(8		)	(8		)
Accumulated OCI ending balance, net of $17 tax	$	(1	)	$	(31	)	$	(32	)
Losses expected to be realized from OCI during the next 12 months, net of $7 tax	$	(1	)	$	(13	)	$	(14	)

Amounts reclassified from accumulated OCI into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded to operating revenue for commodity contracts and interest expense for interest rate contracts. There was no ineffectiveness for the three months ended March 31, 2015 and 2014.

Impact of Derivative Instruments on the Statements of Operations

Unrealized gains and losses associated with changes in the fair value of derivative instruments not accounted for as cash flow hedges and ineffectiveness of hedge derivatives are reflected in current period earnings.

The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense.

	Three months ended March 31,
	2015			2014
Unrealized mark-to-market results	(In millions)
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges	$	(114	)	$	3
Reversal of acquired gain positions related to economic hedges	(26		)	(78		)
Net unrealized losses on open positions related to economic hedges	(138		)	(193		)
Total unrealized mark-to-market losses for economic hedging activities	(278		)	(268		)
Reversal of previously recognized unrealized gains on settled positions related to trading activity	(21		)	—
Reversal of acquired gain positions related to trading activity	(7		)	(1		)
Net unrealized gains on open positions related to trading activity	6			16
Total unrealized mark-to-market (losses)/gains for trading activity	(22		)	15
Total unrealized losses	$	(300	)	$	(253	)

	Three months ended March 31,
	2015			2014
	(In millions)
Unrealized losses included in operating revenues	$	(109	)	$	(316	)
Unrealized (losses)/gains included in cost of operations	(191		)	63
Total impact to statement of operations — energy commodities	$	(300	)	$	(253	)
Total impact to statement of operations — interest rate contracts	$	(14	)	$	(4	)

The reversals of acquired gain or loss positions were valued based upon the forward prices on the acquisition date. The roll-off amounts were offset by realized gains or losses at the settled prices and are reflected in revenue or cost of operations during the same period.

For the three months ended March 31, 2015, the $138 million unrealized loss from open economic hedge positions was primarily the result of a decrease in value of forward purchases of coal due to decreases in coal prices.

24

For the three months ended March 31, 2014, the $193 million unrealized loss from open economic hedge positions was primarily the result of a decrease in value of forward sales of natural gas and electricity due to an increase in forward natural gas and power prices.

Credit Risk Related Contingent Features

Certain of the Company's hedging agreements contain provisions that require the Company to post additional collateral if the counterparty determines that there has been deterioration in credit quality, generally termed “adequate assurance” under the agreements, or requires the Company to post additional collateral if there were a one notch downgrade in the Company's credit rating. The collateral required for contracts with adequate assurance clauses that are in a net liability position as of March 31, 2015, was $131 million. The collateral required for contracts with credit rating contingent features as of March 31, 2015, was $39 million. The Company is also a party to certain marginable agreements where NRG has a net liability position, but the counterparty has not called for the collateral due, which was approximately $8 million as of March 31, 2015.

See Note 4, Fair Value of Financial Instruments, to this Form 10-Q for discussion regarding concentration of credit risk.

25

Note 7 — Debt and Capital Leases

This footnote should be read in conjunction with the complete description under Note 12, Debt and Capital Leases, to the Company's 2014 Form 10-K. Long-term debt and capital leases consisted of the following:

(In millions, except rates)	March 31, 2015		December 31, 2014		Current interest rate % (a)
Recourse debt:
Senior notes, due 2018	$	1,130	$	1,130	7.625
Senior notes, due 2020	1,063		1,063		8.250
Senior notes, due 2021	1,128		1,128		7.875
Senior notes, due 2022	1,100		1,100		6.250
Senior notes, due 2023	990		990		6.625
Senior notes, due 2024	1,000		1,000		6.250
Term loan facility, due 2018	1,978		1,983		L+2.00
Tax-exempt bonds	434		406		4.125 - 6.00
Subtotal NRG recourse debt	8,823		8,800
Non-recourse debt:
GenOn senior notes	2,121		2,133		7.875 - 9.875
GenOn Americas Generation senior notes	926		929		8.500 - 9.125
GenOn Other	60		60		various
Subtotal GenOn debt (non-recourse to NRG)	3,107		3,122
NRG Yield Operating LLC Senior Notes, due 2024	500		500		5.375
NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, due 2019	195		—		L+2.25
NRG Yield, Inc. Convertible Senior Notes, due 2019	327		326		3.500
NRG West Holdings LLC, due 2023 (El Segundo Energy Center)	484		506		L+2.25 - L+2.875
NRG Marsh Landing, due 2017 and 2023	457		464		L+1.75 - L+1.875
Alta Wind I - V lease financing arrangements, due 2034 and 2035	1,036		1,036		5.696-7.015
Alta Wind X, due 2021	300		300		L+2.00
Alta Wind XI, due 2021	191		191		L+2.00
Walnut Creek, term loans due 2023	384		391		L+1.625
Tapestry Wind LLC, due 2021	188		192		L+1.625
Laredo Ridge Wind LLC, due 2026	107		108		L+1.875
NRG Solar Alpine LLC, due 2022	162		163		L+1.750
NRG Energy Center Minneapolis LLC, due 2017 and 2025	119		121		5.95 - 7.25
NRG Yield - other	487		489		various
Subtotal NRG Yield debt (non-recourse to NRG)	4,937		4,787
Ivanpah Financing, due 2033 and 2038	1,179		1,187		2.285 - 4.256
Agua Caliente Solar LLC, due 2037	907		898		2.395 - 3.633
CVSR High Plains Ranch II LLC, due 2037	802		815		2.339 - 3.775
Viento Funding II, Inc., due 2023	196		196		L+2.75
NRG Peaker Finance Co. LLC, bonds due 2019	101		100		L+1.07
Cedro Hill Wind LLC, due 2025	108		111		L+3.125
NRG - other	349		350		various
Subtotal NRG non-recourse debt	3,642		3,657
Subtotal non-recourse debt (including GenOn and NRG Yield)	11,686		11,566
Subtotal long-term debt (including current maturities)	20,509		20,366
Capital leases:
Chalk Point capital lease, due 2015	3		5		8.190
Other	3		3		various
Subtotal long-term debt and capital leases (including current maturities)	20,515		20,374
Less current maturities	465		474
Total long-term debt and capital leases	$	20,050	$	19,900

(a) As of March 31, 2015, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan which is 6 month LIBOR plus x% and the NRG West Holdings LLC term loan, NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC Revolving Credit facility which are 1 month LIBOR plus x%.

26

NRG Recourse Debt

Senior Notes

Issuance of 2022 Senior Notes

On January 27, 2014, NRG issued $1.1 billion in aggregate principal amount at par of 6.25% senior notes due 2022. The notes are senior unsecured obligations of NRG and are guaranteed by certain of its subsidiaries. Interest is payable semi-annually beginning on July 15, 2014, until the maturity date of July 15, 2022. The proceeds were utilized to redeem the 8.5% and 7.625% 2019 Senior Notes, as described below, and to fund the acquisition of EME.

Redemptions of 8.5% and 7.625% 2019 Senior Notes

On February 10, 2014, the Company redeemed $308 million of its 8.5% 2019 Senior Notes and $91 million of its 7.625% 2019 Senior Notes through a tender offer, at an average early redemption percentage of 106.992% and 105.500%, respectively. A $33 million loss on debt extinguishment of the 8.5% and 7.625% 2019 Senior Notes was recorded during the three months ended March 31, 2014, primarily consisting of the premiums paid on the redemption and the write-off of previously deferred financing costs.

NRG Non-Recourse Debt

The Company has non-recourse debt that is secured by acquired or developed projects that are held in several of its subsidiaries.  In the event of a bankruptcy, receivership, liquidation or similar event involving a subsidiary, the assets of such subsidiary would be used to satisfy claims of creditors of the subsidiary, including liabilities under the non-recourse debt associated with such subsidiaries, rather than the creditors of NRG. As described in Note 3, Business Acquisitions and Dispositions, through the Company's acquisitions of EME on April 1, 2014 and Alta Wind on August 12, 2014, the Company acquired approximately $1.2 billion and $1.6 billion of non-recourse debt respectively.

High Lonesome Mesa Facility

Prior to the Company's acquisition of EME, an intercompany tax credit agreement related to the High Lonesome Mesa facility was terminated. The termination resulted in an event of default under the project financing arrangement. As a result, the balance under the project financing arrangement is classified as current and the lender can request repayment at any time. The facility is secured by the assets of High Lonesome Mesa and is non-recourse to NRG.

NRG Yield, Inc. Convertible Notes

During the first quarter of 2014, NRG Yield, Inc. closed on its offering of $345 million aggregate principal amount of 3.50% Convertible Senior Notes due 2019, or the NRG Yield Convertible Notes. The NRG Yield Convertible Notes are convertible, under certain circumstances, into NRG Yield, Inc. Class A common stock, cash or a combination thereof at an initial conversion price of $46.55 per Class A common share, which is equivalent to an initial conversion rate of approximately 21.4822 shares of Class A common stock per $1,000 principal amount of NRG Yield Convertible Notes. Interest on the NRG Yield Convertible Notes is payable semi-annually in arrears on February 1 and August 1 of each year, commencing on August 1, 2014. The NRG Yield Convertible Notes mature on February 1, 2019, unless earlier repurchased or converted in accordance with their terms. Prior to the close of business on the business day immediately preceding August 1, 2018, the NRG Yield Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. The notes are accounted for in accordance with ASC 470-20. Under ASC 470-20, issuers of convertible debt instruments that may be settled in cash upon conversion, including partial cash settlement, are required to separately account for the liability (debt) and equity (conversion option) components. The equity component, the $23 million conversion option value, was recorded to NRG's noncontrolling interest for NRG Yield, Inc. with the offset to debt discount. The debt discount will be amortized to interest expense over the term of the notes.

NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility

NRG Yield LLC and Yield Operating entered into a senior secured revolving credit facility, which provides a revolving line of credit of $60 million. On April 25, 2014, NRG Yield LLC and Yield Operating amended the revolving credit facility to increase the available line of credit to $450 million and extend its maturity to April 2019. The revolving credit facility can be used for cash or for the issuance of letters of credit. On January 2, 2015, NRG Yield borrowed $210 million under the revolving credit facility to fund the acquisition of Walnut Creek, Laredo Ridge and the Tapestry projects. On February 2, 2015, NRG Yield made an optional repayment of $15 million of principal. In addition, there were $36 million of letters of credit issued under the revolving credit facility as of March 31, 2015.

27

Peakers

On February 21, 2014, NRG Peaker Finance Company LLC elected to redeem approximately $30 million of the outstanding bonds at a redemption price equal to the principal amount plus a redemption premium, accrued and unpaid interest, swap breakage, and other fees, totaling approximately $35 million in connection with the removal of Bayou Cove Peaking Power LLC from the peaker financing collateral package, which also involved limited commitments for certain repairs on other assets that were funded concurrently with the December 10, 2013, debt service payment. On March 3, 2014, Bayou Cove Peaking Power LLC sold Bayou Cove Unit 1, which the Company continues to manage and operate.

Note 8 — Variable Interest Entities, or VIEs

Entities that are not Consolidated

NRG has interests in entities that are considered VIEs under ASC 810, Consolidation, but NRG is not considered the primary beneficiary.  NRG accounts for its interests in these entities under the equity method of accounting.

GenConn Energy LLC — Through its consolidated subsidiary, Yield Operating, the Company owns a 50% interest in GenConn, which owns and operates two190 MW peaking generation facilities in Connecticut at NRG's Devon and Middletown sites. NRG's maximum exposure to loss is limited to its equity investment, which was $112 million as of March 31, 2015.

Sherbino I Wind Farm LLC — NRG owns a 50% interest in Sherbino, a joint venture with BP Wind Energy North America Inc. NRG's maximum exposure to loss is limited to its equity investment, which was $81 million as of March 31, 2015.

Entities that are Consolidated

Capistrano Wind Partners — Through the acquisition of EME, the Company has a controlling financial interest in Capistrano Wind Partners, whose Class B preferred equity interest are held by outside investors. Capistrano Wind Partners holds 100% ownership in five projects generating 411 MW of wind capacity. The five wind projects include Cedro Hill located in Texas, Mountain Wind Power I, located in Wyoming, Mountain Wind Power II located in Wyoming, Crofton Bluffs located in Nebraska, and Broken Bow I located in Nebraska.

Under the terms of the Capistrano Wind Partners formation documents, the holders of the Class B preferred equity interests receive 100% of the cash available for distribution, up to a scheduled amount to target a certain return and thereafter cash distributions are shared. The Company retains indirect beneficial ownership of the wind projects and retains responsibilities for managing the operations of Capistrano Wind Partners. Accordingly, the Company consolidates these projects. The Company does not consolidate Capistrano Wind Partners for tax purposes.

The summarized financial information for Capistrano Wind Holdings consisted of the following:

(In millions)	March 31, 2015
Current assets	$	28
Net property, plant and equipment	578
Other long-term assets	137
Total assets	743
Current liabilities	36
Long-term debt	180
Other long-term liabilities	154
Total liabilities	370
Noncontrolling interests	348
Net assets less noncontrolling interests	$	25

Note 9 — Changes in Capital Structure

As of March 31, 2015, and December 31, 2014, the Company had 500,000,000 shares of common stock authorized. The following table reflects the changes in NRG's common stock issued and outstanding:

	Issued	Treasury		Outstanding
Balance as of December 31, 2014	415,506,176	(78,843,552	)	336,662,624
Shares issued under LTIPs	1,176,486	—		1,176,486
Shares issued under ESPP	—	124,625		124,625
Shares repurchased under Capital Allocation Program	—	(3,146,484	)	(3,146,484	)
Balance as of March 31, 2015	416,682,662	(81,865,411	)	334,817,251

Employee Stock Purchase Plan

As of March 31, 2015, there were 1,435,427 shares of treasury stock available for issuance under the ESPP.

NRG Common Stock Dividends

The following table lists the dividends paid during the three months ended March 31, 2015:

	First Quarter 2015
Dividends per Common Share	$	0.145

On April 20, 2015, NRG declared a quarterly dividend on the Company's common stock of $0.145 per share, payable May 15, 2015, to stockholders of record as of May 1, 2015, representing $0.58 on an annualized basis.

The Company's common stock dividends are subject to available capital, market conditions, and compliance with associated laws, regulations and other contractual obligations.

2015 Capital Allocation Program

In December 2014, the Company was authorized to repurchase $100 million of its common stock under the 2015 Capital Allocation Program. In March 2015, the Company was authorized to repurchase an additional $100 million of its common stock under the 2015 Capital Allocation Program, for a total share repurchase of $200 million. In addition, in the second quarter of 2015, the Company's board of directors authorized the repurchase of an additional $81 million of the Company's common stock.

The following table reflects the repurchases made under the 2015 Capital Allocation Program:

	Total number of shares purchased	Average price paid per share (a)		Amounts paid for shares purchased (in millions) (a)
2015 Capital Allocation Program
December 2014	1,624,360	$	26.95	$	44
January 2015	1,755,976	25.19		44
February 2015	468,854	25.46		12
March 2015	921,654	24.92		23
Total Repurchases - First Quarter 2015	3,146,484			79
April 2015	1,328,329	24.47		33
Total Repurchases under 2015 Capital Allocation Program	6,099,173	—		$	156

(a) The average price paid per share and amounts paid for shares purchased excludes the commissions of $0.015 per share paid in connection with the share repurchase.

28

Note 10 — Loss Per Share

Basic loss per common share is computed by dividing net loss less accumulated preferred stock dividends by the weighted average number of common shares outstanding. Shares issued and treasury shares repurchased during the year are weighted for the portion of the year that they were outstanding. Diluted loss per share is computed in a manner consistent with that of basic loss per share while giving effect to all potentially dilutive common shares that were outstanding during the period. The reconciliation of NRG's basic and diluted loss per share is shown in the following table:

	Three months ended March 31,
(In millions, except per share data)	2015			2014
Basic and diluted loss per share attributable to NRG Energy, Inc. common stockholders
Net loss attributable to NRG Energy, Inc.	$	(120	)	$	(56	)
Dividends for preferred shares	5			2
Loss available for common stockholders	$	(125	)	$	(58	)
Weighted average number of common shares outstanding - basic and diluted	336			324
Loss per weighted average common share — basic and diluted	$	(0.37	)	$	(0.18	)

The following table summarizes NRG’s outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company’s diluted loss per share:

	Three months ended March 31,
(In millions of shares)	2015	2014
Equity compensation plans	7	8
Embedded derivative of 2.822% redeemable perpetual preferred stock(a)	16	16
Total	23	24

(a) As of March 31, 2014, the redeemable perpetual preferred stock had an interest rate of 3.625%.

29

Note 11 — Segment Reporting

Effective in December 2014, the Company's segment structure and its allocation of corporate expenses were updated to reflect how management currently makes financial decisions and allocates resources. The Company has recast data from prior periods to reflect this change in reportable segments to conform to the current year presentation. The Company's businesses are segregated as follows: NRG Business, which includes conventional power generation, the carbon capture business and energy services; NRG Home, which includes NRG Home Retail, consisting of residential retail services and products, and NRG Home Solar, which includes the installation and leasing of residential solar systems and the sale of solar energy services; NRG Renew, which includes solar and wind assets, excluding those in the NRG Yield segment; NRG Yield; and corporate activities.  NRG Yield includes certain of the Company's contracted generation assets. On January 2, 2015, NRG Yield, Inc. acquired three projects from the Company: Walnut Creek formerly in the NRG Business segment, the Tapestry projects (Buffalo Bear, Pinnacle and Taloga) and Laredo Ridge, both formerly in the NRG Renew segment. As the transaction was accounted for as a transfer of entities under common control, all historical periods have been recast to reflect this change. The Company's corporate segment includes international business and electric vehicle services. Intersegment sales are accounted for at market.

				NRG Home
(In millions)	NRG Business(a)			Retail(a)		Solar(a)			NRG Renew(a)			NRG Yield(a)			Corporate(a)			Eliminations			Total
Three months ended March 31, 2015	(in millions)
Operating revenues(a)	$	2,506		$	1,311	$	5		$	110		$	180		$	(7	)	$	(279	)	$	3,826
Depreciation and amortization	233			30		6			65			54			7			—			395
Equity in (loss)/earnings of unconsolidated affiliates	(4		)	—		—			—			1			(1		)	1			(3		)
Income/(loss) before income taxes	29			104		(45		)	(61		)	(20		)	(217		)	1			(209		)
Net income/(loss) attributable to NRG Energy, Inc.	$	29		$	104	$	(45	)	$	(50	)	$	(11	)	$	(142	)	$	(5	)	(120		)
Total assets as of March 31, 2015	$	28,744		$	6,270	$	178		$	7,155		$	6,595		$	31,493		$	(40,105	)	$	40,330

(a) Operating revenues include inter-segment sales and net derivative gains and losses of: $ 246 $ — $ — $ — $ — $ 33 $ — $ 279

				NRG Home
(In millions)	NRG Business(b)			Retail(b)		Solar(b)			NRG Renew(b)(c)			NRG Yield(b)		Corporate(b)(c)			Eliminations			Total
Three months ended March 31, 2014	(in millions)
Operating revenues(b)	$	2,346		$	1,082	$	2		$	53		$	140	$	4		$	(141	)	$	3,486
Depreciation and amortization	225			30		1			49			24		6			—			335
Equity in earnings/(loss) of unconsolidated affiliates	5			—		—			(3		)	1		2			2			7
(Loss)/income before income taxes	(6		)	185		(2		)	(65		)	29		(239		)	—			(98		)
Net (loss)/income attributable to NRG Energy, Inc.	$	(6	)	$	185	$	(2	)	$	(48	)	$	22	$	(209	)	$	2		(56		)

(b) Operating revenues include inter-segment sales and net derivative gains and losses of: $ 113 $ 2 $ — $ — $ — $ 26 $ — $ 141

(c) Includes loss on debt extinguishment of: $ — $ — $ — $ (1 ) $ — $ (40 ) $ — $ (41 )

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Note 12 — Income Taxes

Effective Tax Rate

The income tax provision consisted of the following:

	Three months ended March 31,
(In millions except otherwise noted)	2015			2014
Loss before income taxes	$	(209	)	$	(98	)
Income tax benefit	(73		)	(31		)
Effective tax rate	34.9		%	31.6		%

For the three months ended March 31, 2015, NRG's overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of production tax credits generated from our wind assets partially offset by non-taxable equity earnings and tax expense attributable to consolidated partnerships.

For the three months ended March 31, 2014, NRG's overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of non-taxable equity earnings, production tax credits and the impact of state and local income taxes.

Uncertain Tax Benefits

As of March 31, 2015, NRG has recorded a non-current tax liability of $55 million for uncertain tax benefits from positions taken on various state income tax returns, including accrued interest. For the three months ended March 31, 2015, NRG accrued an insignificant amount of interest relating to the uncertain tax benefits. As of March 31, 2015, NRG had cumulative interest and penalties related to these uncertain tax benefits of $6 million . The Company recognizes interest and penalties related to uncertain tax benefits in income tax expense.

NRG is subject to examination by taxing authorities for income tax returns filed in the U.S. federal jurisdiction and various state and foreign jurisdictions including operations located in Australia. The Company is not subject to U.S. federal income tax examinations for years prior to 2011. With few exceptions, state and local income tax examinations are no longer open for years before 2009. The Company's primary foreign operations are also no longer subject to examination by local jurisdictions for years prior to 2010.

Note 13 — Commitments and Contingencies

This footnote should be read in conjunction with the complete description under Note 22, Commitments and Contingencies, to the Company's 2014 Form 10-K.

Commitments

First Lien Structure

NRG has granted first liens to certain counterparties on a substantial portion of the Company's assets, excluding assets acquired in the GenOn and EME (including Midwest Generation) acquisitions, assets held by NRG Yield, Inc. and NRG's assets that have project-level financing, to reduce the amount of cash collateral and letters of credit that it would otherwise be required to post from time to time to support its obligations under out-of-the-money hedge agreements for forward sales of power or MWh equivalents. The Company's lien counterparties may have a claim on NRG's assets to the extent market prices exceed the hedged price. As of March 31, 2015, hedges under the first liens were in-the-money for NRG on a counterparty aggregate basis.

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Contingencies

The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. NRG records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. In addition, legal costs are expensed as incurred. Management has assessed each of the following matters based on current information and made a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. Unless specified below, the Company is unable to predict the outcome of these legal proceedings or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded reserves and that such difference could be material.

In addition to the legal proceedings noted below, NRG and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows.

Midwest Generation Asbestos Liabilities— The Company, through its subsidiary, Midwest Generation, may be subject to potential asbestos liabilities as a result of its acquisition of EME. The Company is currently analyzing the scope of potential liability as it may relate to Midwest Generation. The Company believes that it has established an adequate reserve to deal with these cases.

Actions Pursued by MC Asset Recovery—With Mirant Corporation's emergence from bankruptcy protection in 2006, certain actions filed by GenOn Energy Holdings and some of its subsidiaries against third parties were transferred to MC Asset Recovery, a wholly owned subsidiary of GenOn Energy Holdings.  MC Asset Recovery is governed by a manager who is independent of NRG and GenOn.  MC Asset Recovery is a disregarded entity for income tax purposes. Under the remaining action transferred to MC Asset Recovery, MC Asset Recovery seeks to recover damages from Commerzbank AG and various other banks, or the Commerzbank Defendants, for alleged fraudulent transfers that occurred prior to Mirant's bankruptcy proceedings.  In December 2010, the U.S. District Court for the Northern District of Texas dismissed MC Asset Recovery's complaint against the Commerzbank Defendants.  In January 2011, MC Asset Recovery appealed the District Court's dismissal of its complaint against the Commerzbank Defendants to the U.S. Court of Appeals for the Fifth Circuit.  In March 2012, the Court of Appeals reversed the District Court's dismissal and reinstated MC Asset Recovery's amended complaint against the Commerzbank Defendants.  If MC Asset Recovery succeeds in obtaining any recoveries from the Commerzbank Defendants, the Commerzbank Defendants have asserted that they will seek to file claims in Mirant's bankruptcy proceedings for the amount of those recoveries.  GenOn Energy Holdings would vigorously contest the allowance of any such claims. If the Commerzbank Defendants were to receive an allowed claim as a result of a recovery by MC Asset Recovery on its claims against them, GenOn Energy Holdings would retain from the net amount recovered by MC Asset Recovery an amount equal to the dollar amount of the resulting allowed claim.

Pending Natural Gas Litigation—GenOn is party to several lawsuits, certain of which are class action lawsuits, in state and federal courts in Kansas, Missouri, Nevada and Wisconsin. These lawsuits were filed in the aftermath of the California energy crisis in 2000 and 2001 and the resulting FERC investigations and relate to alleged conduct to increase natural gas prices in violation of antitrust and similar laws. The lawsuits seek treble or punitive damages, restitution and/or expenses. The lawsuits also name as parties a number of energy companies unaffiliated with NRG. In July 2011, the U.S. District Court for the District of Nevada, which was handling four of the five cases, granted the defendants' motion for summary judgment and dismissed all claims against GenOn in those cases. The plaintiffs appealed to the U.S. Court of Appeals for the Ninth Circuit which reversed the decision of the District Court. On August 26, 2013, GenOn along with the other defendants in the lawsuit filed a petition for a writ of certiorari to the U.S. Supreme Court challenging the Court of Appeals' decision. On July 1, 2014, the U.S. Supreme Court granted the petition. On April 21, 2015, the U.S. Supreme Court affirmed the Ninth Circuit’s holding that plaintiffs’ state antitrust law claims are not field-preempted.  The U.S. Supreme Court left open whether the claims were preempted on the basis of conflict preemption and directed that the case be sent to the U.S. District Court for the District of Nevada for further proceedings.

In September 2012, the State of Nevada Supreme Court, which was handling the remaining case, affirmed dismissal by the Eighth Judicial District Court for Clark County, Nevada of all plaintiffs' claims against GenOn. In February 2013, the plaintiffs in the Nevada case filed a petition for a writ of certiorari to the U.S. Supreme Court. In June 2013, the U.S. Supreme Court denied the petition for a writ of certiorari, thereby ending one of the five lawsuits. GenOn has agreed to indemnify CenterPoint against certain losses relating to these lawsuits.

32

Cheswick Class Action Complaint —In April 2012, a putative class action lawsuit was filed against GenOn in the Court of Common Pleas of Allegheny County, Pennsylvania alleging that emissions from the Cheswick generating facility have damaged the property of neighboring residents. The Company disputes these allegations. Plaintiffs have brought nuisance, negligence, trespass and strict liability claims seeking both damages and injunctive relief. Plaintiffs seek to certify a class that consists of people who own property or live within one mile of the Company's plant. In July 2012, the Company removed the lawsuit to the U.S. District Court for the Western District of Pennsylvania. In October 2012, the District Court granted the Company's motion to dismiss, which plaintiffs appealed to the U.S. Court of Appeals for the Third Circuit. On August 20, 2013, the Court of Appeals reversed the decision of the District Court. On September 3, 2013, the Company filed a petition for rehearing with the Court of Appeals which was subsequently denied. In February 2014, the Company filed a petition for a writ of certiorari to the U.S. Supreme Court seeking review and reversal of the Court of Appeals' decision. On June 2, 2014, the U.S. Supreme Court denied the petition for a writ of certiorari. Following the U.S. Supreme Court's denial of GenOn’s petition for a writ of certiorari, the case continued to be litigated before the U.S. District Court for the Western District of Pennsylvania. After briefing by the parties on GenOn's motion to strike class allegations in the complaint, the court granted GenOn's motion, but allowed the plaintiffs the opportunity to re-file their complaint. On February 3, 2015, plaintiffs sought leave to file an amended complaint, which the Company is contesting.

Energy Plus Holdings—On August 7, 2012, Energy Plus Holdings received a subpoena from the NYAG which generally sought information and business records related to Energy Plus Holdings' sales, marketing and business practices. Energy Plus Holdings provided documents and information to the NYAG. Energy Plus Holdings continues to cooperate and discuss a resolution of these issues with the NYAG.

Maryland Department of the Environment v. GenOn Chalk Point and GenOn Mid-Atlantic— On January 25, 2013, Food & Water Watch, the Patuxent Riverkeeper and the Potomac Riverkeeper (together, the Citizens Group) sent GenOn Mid-Atlantic a letter alleging that the Chalk Point, Dickerson and Morgantown generating facilities were violating the terms of the three National Pollution Discharge Elimination System permits by discharging nitrogen and phosphorous in excess of the limits in each permit. On March 21, 2013, the MDE sent GenOn Mid-Atlantic a similar letter with respect to the Chalk Point and Dickerson generating facilities, threatening to sue within 60 days if the generating facilities were not brought into compliance. On June 11, 2013, the Maryland Attorney General on behalf of the MDE filed a complaint in the U.S. District Court for the District of Maryland alleging violations of the CWA and Maryland environmental laws related to water. The lawsuit is ongoing and seeks injunctive relief and civil penalties in excess of $100,000. The Company does not expect the resolution of this matter to have a material impact on the Company's consolidated financial position, results of operations, or cash flows.

Midwest Generation New Source Review Litigation— In August 2009, the EPA and the Illinois Attorney General, or the Government Plaintiffs, filed a complaint, or the Governments’ Complaint, in the U.S. District Court for the Northern District of Illinois alleging violations of CAA PSD requirements by Midwest Generation arising from maintenance, repair or replacement projects at six Illinois coal-fired electric generating stations performed by Midwest Generation or ComEd, a prior owner of the stations, including alleged failures to obtain PSD construction permits and to comply with BACT requirements. The Government Plaintiffs also alleged violations of opacity and PM standards at the Midwest Generation plants. Finally, the Government Plaintiffs alleged that Midwest Generation violated certain operating permit requirements under Title V of the CAA allegedly arising from such claimed PSD, opacity and PM emission violations. In addition to seeking penalties of up to $37,500 per violation, per day, the complaint seeks an injunction ordering Midwest Generation to install controls sufficient to meet BACT emission rates at the units subject to the complaint and other remedies, which could go well beyond the requirements of the CPS. Several environmental groups intervened as plaintiffs in this litigation and filed a complaint, or the Intervenors’ Complaint, which alleged opacity, PM and related Title V violations. Midwest Generation filed a motion to dismiss nine of the ten PSD counts in the Governments’ Complaint, and to dismiss the tenth PSD count to the extent the Governments’ Complaint sought civil penalties for that count. The trial court granted the motion in March 2010.

33

In June 2010, the Government Plaintiffs and Intervenors each filed an amended complaint. The Governments’ Amended Complaint again alleged that Midwest Generation violated PSD (based upon the same projects as alleged in their original complaint, but adding allegations that the Company was liable as the “successor” to ComEd), Title V and opacity and PM standards. It named EME and ComEd as additional defendants and alleged PSD violations (again, premised on the same projects) against them. The Intervenors’ Amended Complaint named only Midwest Generation as a defendant and alleged Title V and opacity/PM violations, as well as one of the ten PSD violations alleged in the Governments’ Amended Complaint. Midwest Generation again moved to dismiss all but one of the Government Plaintiffs’ PSD claims and the related Title V claims. Midwest Generation also filed a motion to dismiss the PSD claim in the Intervenors’ Amended Complaint and the related Title V claims. In March 2011, the trial court granted Midwest Generation’s partial motion to dismiss the Government Plaintiffs’ PSD claims. The trial court denied Midwest Generation’s motion to dismiss the PSD claim asserted in the Intervenors’ Amended Complaint, but noted that the plaintiffs would be required to convince the court that the statute of limitations should be equitably tolled. The trial court did not address other counts in the amended complaints that allege violations of opacity and PM emission limitations under the Illinois State Implementation Plan and related Title V claims. The trial court also granted the motions to dismiss the PSD claims asserted against EME and ComEd.

Following the trial court ruling, the Government Plaintiffs appealed the trial court’s dismissals of their PSD claims, including the dismissal of nine of the ten PSD claims against Midwest Generation and of the PSD claims against the other defendants. Those PSD claim dismissals were affirmed by the U.S. Court of Appeals for the Seventh Circuit in July 2013. In addition, in 2012, all but one of the environmental groups that had intervened in the case dismissed their claims without prejudice. As a result, only one environmental group remains a plaintiff intervenor in the case. The Company does not expect the resolution of this matter to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.

Note 14 — Regulatory Matters

This footnote should be read in conjunction with the complete description under Note 23, Regulatory Matters, to the Company's 2014 Form 10-K.

NRG operates in a highly regulated industry and is subject to regulation by various federal and state agencies. As such, NRG is affected by regulatory developments at both the federal and state levels and in the regions in which NRG operates. In addition, NRG is subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which NRG participates. These power markets are subject to ongoing legislative and regulatory changes that may impact NRG's wholesale and retail businesses.

In addition to the regulatory proceedings noted below, NRG and its subsidiaries are a party to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows.

National

Court Rejects FERC's Jurisdiction Over Demand Response — On May 23, 2014, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s rules (known as Order No. 745) that allowed demand response resources to participate in FERC-jurisdictional energy markets. The Court of Appeals held that the Federal Power Act does not authorize FERC to exercise jurisdiction over demand response and that instead demand response is part of the retail market over which the states have jurisdiction. The specific order being challenged related to energy market compensation, but this ruling also calls into question whether demand response will be permitted to participate in the capacity markets in the future. Parties including the U.S. Solicitor General have filed petitions for a writ of certiorari with the U.S. Supreme Court. On May 4, 2015, the U.S. Supreme Court granted certiorari on two questions: first, on whether the FPA gives FERC jurisdiction over demand response, and second, whether FERC’s Order No. 745 correctly determined the level of compensation paid to generators participating in the energy markets. The eventual outcome of this proceeding could result in refunds of payments made for non-jurisdictional services and resettlement of wholesale markets, but it is not possible to predict the outcome or estimate the impact on the Company at this time.

East Region

Montgomery County Station Power Tax—On December 20, 2013, the Company received a letter from Montgomery County, Maryland requesting payment of an energy tax for the consumption of station power at the Dickerson Facility over the previous three years.  Montgomery County seeks payment in the amount of $22 million, which includes tax, interest and penalties.  The Company is disputing the applicability of the tax. On December 17, 2014, the Maryland Tax Court heard oral arguments from the parties. Subsequently, post hearing briefs were filed. The decision is pending.

34

Note 15 — Environmental Matters

This footnote should be read in conjunction with the complete description under Note 24, Environmental Matters, to the Company's 2014 Form 10-K.

NRG is subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. NRG is also subject to laws and regulations surrounding the protection of wildlife, including migratory birds, eagles and threatened and endangered species. Environmental laws have become increasingly stringent and NRG expects this trend to continue. The electric generation industry is likely to face new requirements to address various emissions, including GHG, as well as combustion byproducts, water discharge and use, and threatened and endangered species. In general, future laws are expected to require the addition of emissions controls or other environmental controls or to impose certain restrictions on the operations of the Company's facilities, which could have a material effect on the Company's operations.

The EPA finalized CSAPR in 2011, which was intended to replace CAIR in January 2012. In December 2011, the U.S. Court of Appeals for the District of Columbia Circuit stayed the implementation of CSAPR and then issued an opinion in August 2012 vacating CSAPR and keeping CAIR in place until the EPA could replace it. On April 29, 2014, the U.S. Supreme Court reversed and remanded the D.C. Circuit's decision. In October 2014, the D.C. Circuit lifted the stay of CSAPR. In response, the EPA issued an interim final rule in November 2014 to amend the CSAPR compliance dates. Accordingly, CSAPR replaced CAIR on January 1, 2015. On February 25, 2015, the D.C. Circuit held oral argument regarding several unresolved legal issues and the Company expects a decision in the second quarter of 2015. While NRG cannot predict the final outcome of the ongoing litigation, the Company believes its investment in pollution controls and cleaner technologies coupled with planned plant retirements should leave the fleet well positioned for compliance.

In December 2014, the EPA proposed making the NAAQS for ozone more stringent. The EPA anticipates promulgating a more stringent ozone NAAQS by October 2015. A more stringent NAAQS would obligate the states to develop plans to reduce NO_x (an ozone precursor), which might affect some of the Company's units.

In February 2012, the EPA promulgated standards to control emissions of HAPs from coal and oil-fired electric generating units. The rule established limits for mercury, non-mercury metals, certain organics and acid gases, which limits must be met beginning in April 2015 (with some units getting a 1-year extension). In November 2014, the U.S. Supreme Court agreed to review the D.C. Circuit decision that denied the petitions seeking to vacate MATS but the review is limited to whether the EPA unreasonably refused to consider costs in determining whether it is appropriate to regulate HAPs emitted by electric generating units. Oral argument in the U.S. Supreme Court occurred in March 2015, and the Company expects a decision in the second quarter of 2015.

In January 2014, the EPA re-proposed the NSPS for CO₂ emissions from new fossil-fuel-fired electric generating units that had been previously proposed in April 2012. The re-proposed standards are 1,000 pounds of CO₂ per MWh for large gas units and 1,100 pounds of CO₂ per MWh for coal units and small gas units. Proposed standards are in effect until a final rule is published or another rule is re-proposed. In June 2014, the EPA proposed a rule that would require states to develop CO₂ standards that would apply to existing fossil-fueled generating facilities. Specifically, the EPA proposed state-specific rate-based goals for CO₂ emissions, as well as guidelines for states to follow in developing plans to achieve the state-specific goals. The EPA anticipates finalizing both of these rules in the summer of 2015.

Water

In August 2014, the EPA finalized the regulation regarding the use of water for once through cooling at existing facilities to address impingement and entrainment concerns. NRG anticipates that more stringent requirements will be incorporated into some of its water discharge permits over the next several years.

Byproducts, Wastes, Hazardous Materials and Contamination

In April 2015, the EPA finalized the rule regulating byproducts of coal combustion (e.g., ash and gypsum) as solid wastes under the RCRA. In 2010, the EPA had proposed two alternatives. Under the first proposal, these byproducts would be regulated as solid wastes. Under the second proposal, these byproducts would have been regulated as “special wastes” in a manner similar to the regulation of hazardous waste with an exception for certain types of beneficial use of these byproducts. The second alternative would have imposed significantly more stringent requirements and materially increased the cost of disposal of coal combustion byproducts. The Company is evaluating the impact of the new rule on its results of operations, financial condition and cash flows.

35

East Region

Maryland Environmental Regulations — In December 2014, MDE proposed in the Maryland Register a regulation regarding NO_x emissions from coal-fired electric generating units, which if finalized would have required by 2020 the Company (at each of the three Dickerson coal-fired units and the Chalk Point coal-fired unit that does not have an SCR) to (1) install and operate an SCR; (2) retire the unit; or (3) convert the fuel source from coal to natural gas. Earlier this year, a new administration decided not to finalize the regulation as proposed. Later this year, the Company expects MDE to propose revised regulations to address future NO_x reductions, which when finalized may negatively affect certain of the Company’s coal-fired units in Maryland.

Environmental Capital Expenditures

Based on current (and in some cases proposed) rules, technology and preliminary plans based on some proposed rules, NRG estimates that environmental capital expenditures from 2015 through 2019 required to comply with environmental laws will be approximately $614 million which includes $57 million for GenOn and $440 million for Midwest Generation. These costs are primarily associated with (i) controls to satisfy MATS and the recent NSR settlement at Big Cajun II; (ii) controls to satisfy MATS at W.A. Parish, Limestone and Conemaugh; (iii) NO_x controls for Sayreville and Gilbert; and (iv) DSI/ESP upgrades at Waukegan and Powerton to satisfy the IL CPS and the Joliet gas conversion.

36

Note 16 — Condensed Consolidating Financial Information

As of March 31, 2015, the Company had outstanding $6.4 billion of Senior Notes due from 2018 - 2024, as shown in Note 7, Debt and Capital Leases. These Senior Notes are guaranteed by certain of NRG's current and future 100% owned domestic subsidiaries, or guarantor subsidiaries. These guarantees are both joint and several. The non-guarantor subsidiaries include all of NRG's foreign subsidiaries and certain domestic subsidiaries, including GenOn and its subsidiaries and NRG Yield, Inc. and its subsidiaries.

Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes as of March 31, 2015:

Ace Energy, Inc.	NEO Freehold-Gen LLC	NRG Operating Services, Inc.
Allied Warranty LLC	NEO Power Services Inc.	NRG Oswego Harbor Power Operations Inc.
Arthur Kill Power LLC	New Genco GP, LLC	NRG PacGen Inc.
Astoria Gas Turbine Power LLC	Norwalk Power LLC	NRG Portable Power LLC
Bayou Cove Peaking Power, LLC	NRG Affiliate Services Inc.	NRG Power Marketing LLC
BidURenergy, Inc.	NRG Artesian Energy LLC	NRG Reliability Solutions LLC
Cabrillo Power I LLC	NRG Arthur Kill Operations Inc.	NRG Renter's Protection LLC
Cabrillo Power II LLC	NRG Astoria Gas Turbine Operations Inc.	NRG Retail LLC
Carbon Management Solutions LLC	NRG Bayou Cove LLC	NRG Retail Northeast LLC
Cirro Group, Inc.	NRG Business Solutions LLC	NRG Rockford Acquisition LLC
Cirro Energy Services, Inc.	NRG Cabrillo Power Operations Inc.	NRG Saguaro Operations Inc.
Clean Edge Energy LLC	NRG California Peaker Operations LLC	NRG Security LLC
Conemaugh Power LLC	NRG Cedar Bayou Development Company, LLC	NRG Services Corporation
Connecticut Jet Power LLC	NRG Connected Home LLC	NRG SimplySmart Solutions LLC
Cottonwood Development LLC	NRG Connecticut Affiliate Services Inc.	NRG South Central Affiliate Services Inc.
Cottonwood Energy Company LP	NRG Construction LLC	NRG South Central Generating LLC
Cottonwood Generating Partners I LLC	NRG Curtailment Solutions LLC	NRG South Central Operations Inc.
Cottonwood Generating Partners II LLC	NRG Development Company Inc.	NRG South Texas LP
Cottonwood Generating Partners III LLC	NRG Devon Operations Inc.	NRG Texas C&I Supply LLC
Cottonwood Technology Partners LP	NRG Dispatch Services LLC	NRG Texas Gregory LLC
Devon Power LLC	NRG Distributed Generation PR LLC	NRG Texas Holding Inc.
Dunkirk Power LLC	NRG Dunkirk Operations Inc.	NRG Texas LLC
Eastern Sierra Energy Company LLC	NRG El Segundo Operations Inc.	NRG Texas Power LLC
El Segundo Power, LLC	NRG Energy Efficiency-L LLC	NRG Warranty Services LLC
El Segundo Power II LLC	NRG Energy Efficiency-P LLC	NRG West Coast LLC
Energy Alternatives Wholesale, LLC	NRG Energy Labor Services LLC	NRG Western Affiliate Services Inc.
Energy Curtailment Specialists, Inc.	NRG Energy Services Group LLC	O'Brien Cogeneration, Inc. II
Energy Plus Holdings LLC	NRG Energy Services International Inc.	ONSITE Energy, Inc.
Energy Plus Natural Gas LLC	NRG Energy Services LLC	Oswego Harbor Power LLC
Energy Protection Insurance Company	NRG Generation Holdings, Inc.	RE Retail Receivables, LLC
Everything Energy LLC	NRG Home & Business Solutions LLC	Reliant Energy Northeast LLC
Forward Home Security LLC	NRG Home Services LLC	Reliant Energy Power Supply, LLC
GCP Funding Company, LLC	NRG Home Solutions LLC	Reliant Energy Retail Holdings, LLC
Green Mountain Energy	NRG Home Solutions Product LLC	Reliant Energy Retail Services, LLC
Green Mountain Energy Co LLC	NRG Homer City Services LLC	RERH Holdings LLC
Gregory Partners, LLC	NRG Huntley Operations Inc.	Saguaro Power LLC
Gregory Power Partners LLC	NRG HQ DC LLC	Somerset Operations Inc.
Huntley Power LLC	NRG Identity Protect LLC	Somerset Power LLC
Independence Energy Alliance LLC	NRG Ilion Limited Partnership	Texas Genco Financing Corp.
Independence Energy Group LLC	NRG Ilion LP LLC	Texas Genco GP, LLC
Independence Energy Natural Gas LLC	NRG International LLC	Texas Genco Holdings, Inc.
Indian River Operations Inc.	NRG Maintenance Services LLC	Texas Genco LP, LLC
Indian River Power LLC	NRG Mextrans Inc.	Texas Genco Operating Services, LLC
Keystone Power LLC	NRG MidAtlantic Affiliate Services Inc.	Texas Genco Services, LP
Langford Wind Power, LLC	NRG Middletown Operations Inc.	US Retailers LLC
Louisiana Generating LLC	NRG Montville Operations Inc.	Vienna Operations Inc.
Meriden Gas Turbines LLC	NRG New Roads Holdings LLC	Vienna Power LLC
Middletown Power LLC	NRG North Central Operations Inc.	WCP (Generation) Holdings LLC
Montville Power LLC	NRG Northeast Affiliate Services Inc.	West Coast Power LLC
NEO Corporation	NRG Norwalk Harbor Operations Inc.

37

NRG conducts much of its business through and derives much of its income from its subsidiaries. Therefore, the Company's ability to make required payments with respect to its indebtedness and other obligations depends on the financial results and condition of its subsidiaries and NRG's ability to receive funds from its subsidiaries. There are no restrictions on the ability of any of the guarantor subsidiaries to transfer funds to NRG. However, there may be restrictions for certain non-guarantor subsidiaries.

The following condensed consolidating financial information presents the financial information of NRG Energy, Inc., the guarantor subsidiaries and the non-guarantor subsidiaries in accordance with Rule 3-10 under the SEC Regulation S-X. The financial information may not necessarily be indicative of results of operations or financial position had the guarantor subsidiaries or non-guarantor subsidiaries operated as independent entities.

In this presentation, NRG Energy, Inc. consists of parent company operations. Guarantor subsidiaries and non-guarantor subsidiaries of NRG are reported on an equity basis. For companies acquired, the fair values of the assets and liabilities acquired have been presented on a push-down accounting basis.

38

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	2,563		$	1,303		$	—		$	(40	)	$	3,826
Operating Costs and Expenses
Cost of operations	2,104			995			12			(49		)	3,062
Depreciation and amortization	204			186			5			—			395
Selling, general and administrative	102			101			60			—			263
Acquisition-related transaction and integration costs	—			2			8			—			10
Development activity expenses	—			15			19			—			34
Total operating costs and expenses	2,410			1,299			104			(49		)	3,764
Gain on postretirement benefits curtailment	—			14			—			—			14
Operating Income/(Loss)	153			18			(104		)	9			76
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	(13		)	(8		)	50			(29		)	—
Equity in earnings of unconsolidated affiliates	—			(4		)	(1		)	2			(3		)
Other income, net	1			17			1			—			19
Loss on debt extinguishment	—			—			—			—			—
Interest expense	(4		)	(158		)	(139		)	—			(301		)
Total other expense	(16		)	(153		)	(89		)	(27		)	(285		)
Income/(Loss) Before Income Taxes	137			(135		)	(193		)	(18		)	(209		)
Income tax expense/(benefit)	54			(60		)	(67		)	—			(73		)
Net Income/(Loss)	83			(75		)	(126		)	(18		)	(136		)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	—			(21		)	(6		)	11			(16		)
Net Income/(Loss) Attributable to NRG Energy, Inc.	$	83		$	(54	)	$	(120	)	$	(29	)	$	(120	)

(a) All significant intercompany transactions have been eliminated in consolidation.

39

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Net Income/(Loss)	$	83		$	(75	)	$	(126	)	$	(18	)	$	(136	)
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	(7		)	11			(16		)	—			(12		)
Foreign currency translation adjustments, net	—			(9		)	(2		)	—			(11		)
Available-for-sale securities, net	—			(1		)	—			—			(1		)
Defined benefit plan, net	(3		)	(1		)	11			—			7
Other comprehensive (loss)/income	(10		)	—			(7		)	—			(17		)
Comprehensive Income/(Loss)	73			(75		)	(133		)	(18		)	(153		)
Less: Comprehensive income/(loss) attributable to noncontrolling interest and redeemable noncontrolling interest	—			(34		)	(6		)	11			(29		)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	73			(41		)	(127		)	(29		)	(124		)
Dividends for preferred shares	—			—			5			—			5
Comprehensive Income/(Loss) Available for Common Stockholders	$	73		$	(41	)	$	(132	)	$	(29	)	$	(129	)

(a) All significant intercompany transactions have been eliminated in consolidation.

40

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	13		$	1,378		$	773		$	—		$	2,164
Funds deposited by counterparties	39			29			—			—			68
Restricted cash	14			427			2			—			443
Accounts receivable, net	936			240			3			—			1,179
Inventory	505			604			—			—			1,109
Derivative instruments	1,480			938			—			(389		)	2,029
Cash collateral paid in support of energy risk management activities	246			154			—			—			400
Accounts receivable - affiliate	8,656			2,103			(5,750		)	(5,002		)	7
Deferred income taxes	—			93			95			—			188
Renewable energy grant receivable	—			68			—			—			68
Prepayments and other current assets	148			319			—			—			467
Total current assets	12,037			6,353			(4,877		)	(5,391		)	8,122
Net property, plant and equipment	8,260			13,847			194			(25		)	22,276
Other Assets
Investment in subsidiaries	422			2,542			21,907			(24,871		)	—
Equity investments in affiliates	(18		)	841			39			(90		)	772
Notes receivable, less current portion	—			58			221			(212		)	67
Goodwill	2,072			448			—			—			2,520
Intangible assets, net	859			1,637			1			(6		)	2,491
Nuclear decommissioning trust fund	586			—			—			—			586
Derivative instruments	318			321			1			(49		)	591
Deferred income tax	(61		)	652			893			—			1,484
Non-current assets held-for-sale	—			17			—			—			17
Other non-current assets	112			681			611			—			1,404
Total other assets	4,290			7,197			23,673			(25,228		)	9,932
Total Assets	$	24,587		$	27,397		$	18,990		$	(30,644	)	$	40,330
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	445		$	231		$	(212	)	$	465
Accounts payable	645			358			42			—			1,045
Accounts payable — affiliate	2,336			2,853			(576		)	(4,613		)	—
Derivative instruments	1,439			834			—			(389		)	1,884
Cash collateral received in support of energy risk management activities	39			29			—			—			68
Accrued expenses and other current liabilities	233			496			318			—			1,047
Total current liabilities	4,693			5,015			15			(5,214		)	4,509
Other Liabilities
Long-term debt and capital leases	308			11,456			8,286			—			20,050
Nuclear decommissioning reserve	314			—			—			—			314
Nuclear decommissioning trust liability	328			—			—			—			328
Deferred income taxes	1,284			(1,039		)	(225		)	—			20
Derivative instruments	369			330			—			(49		)	650
Out-of-market contracts	107			1,114			—			—			1,221
Other non-current liabilities	490			767			292			—			1,549
Total non-current liabilities	3,200			12,628			8,353			(49		)	24,132
Total liabilities	7,893			17,643			8,368			(5,263		)	28,641
2.822% convertible perpetual preferred stock	—			—			293			—			293
Redeemable noncontrolling interest in subsidiaries	—			19			—			—			19
Stockholders’ Equity	16,694			9,735			10,329			(25,381		)	11,377
Total Liabilities and Stockholders’ Equity	$	24,587		$	27,397		$	18,990		$	(30,644	)	$	40,330

(a) All significant intercompany transactions have been eliminated in consolidation.

41

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Cash Flows from Operating Activities
Net Cash Provided/(Used) by Operating Activities	$	820		$	(430	)	$	(539	)	$	409		$	260
Cash Flows from Investing Activities
(Payments for)/proceeds from intercompany loans to subsidiaries	(737		)	328			409			—			—
Acquisition of businesses, net of cash acquired	—			(1		)	—			—			(1		)
Capital expenditures	(89		)	(157		)	(6		)	—			(252		)
Increase in restricted cash, net	—			(11		)	—			—			(11		)
Decrease/(increase) in restricted cash — U.S. DOE projects	—			24			1			—			25
Decrease in notes receivable	—			5			—			—			5
Investments in nuclear decommissioning trust fund securities	(193		)	—			—			—			(193		)
Proceeds from sales of nuclear decommissioning trust fund securities	196			—			—			—			196
Proceeds from renewable energy grants	—			2			—			—			2
Other	(2		)	(2		)	(37		)	—			(41		)
Net Cash Used by Investing Activities	(825		)	188			367			—			(270		)
Cash Flows from Financing Activities
Proceeds/(payments) from intercompany loans	—			—			409			(409		)	—
Payment of dividends to common and preferred stockholders	—			—			(51		)	—			(51		)
Payment for treasury stock	—			—			(79		)	—			(79		)
Net payments for settlement of acquired derivatives that include financing elements	—			40			—			—			40
Proceeds from issuance of long-term debt	—			221			27			—			248
Contributions to, net of distributions from, noncontrolling interest in subsidiaries	—			(25		)	—			—			(25		)
Proceeds from issuance of common stock	—			—			1			—			1
Payments for short and long-term debt	—			(89		)	(5		)	—			(94		)
Net Cash Provided by Financing Activities	—			147			302			(409		)	40
Effect of exchange rate changes on cash and cash equivalents	—			18			—			—			18
Net (Decrease)/Increase in Cash and Cash Equivalents	(5		)	(77		)	130			—			48
Cash and Cash Equivalents at Beginning of Period	18			1,455			643			—			2,116
Cash and Cash Equivalents at End of Period	$	13		$	1,378		$	773		$	—		$	2,164

(a) All significant intercompany transactions have been eliminated in consolidation.

42

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	2,279		$	1,251		$	—		$	(44	)	$	3,486
Operating Costs and Expenses
Cost of operations	1,797			974			(4		)	(30		)	2,737
Depreciation and amortization	198			134			3			—			335
Selling, general and administrative	101			57			64			—			222
Acquisition-related transaction and integration costs	—			1			11			—			12
Development activity expenses	—			10			9			—			19
Total operating costs and expenses	2,096			1,176			83			(30		)	3,325
Gain on sale of assets	—			19			—			—			19
Operating Income/(Loss)	183			94			(83		)	(14		)	180
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	49			(6		)	115			(158		)	—
Equity in earnings of unconsolidated affiliates	4			1			—			2			7
Other income, net	1			4			7			(1		)	11
Loss on debt extinguishment	—			(9		)	(32		)	—			(41		)
Interest expense	(6		)	(107		)	(143		)	1			(255		)
Total other income/(expense)	48			(117		)	(53		)	(156		)	(278		)
Income/(Loss) Before Income Taxes	231			(23		)	(136		)	(170		)	(98		)
Income tax expense/(benefit)	63			(10		)	(84		)	—			(31		)
Net Loss	168			(13		)	(52		)	(170		)	(67		)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	—			(3		)	4			(12		)	(11		)
Net Income/(Loss) Attributable to NRG Energy, Inc.	$	168		$	(10	)	$	(56	)	$	(158	)	$	(56	)

(a) All significant intercompany transactions have been eliminated in consolidation.

43

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Net Income/(Loss)	$	168	$	(13	)	$	(52	)	$	(170	)	$	(67	)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain/(loss) on derivatives, net	6		(6		)	5			(14		)	(9		)
Foreign currency translation adjustments, net	—		6			—			—			6
Available-for-sale securities, net	—		—			4			2			6
Defined benefit plan	2		—			—			—			2
Other comprehensive income/(loss)	8		—			9			(12		)	5
Comprehensive Income/(Loss)	176		(13		)	(43		)	(182		)	(62		)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	—		(5		)	4			(14		)	(15		)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	176		(8		)	(47		)	(168		)	(47		)
Dividends for preferred shares	—		—			2			—			2
Comprehensive Income/(Loss) Available for Common Stockholders	$	176	$	(8	)	$	(49	)	$	(168	)	$	(49	)

(a) All significant intercompany transactions have been eliminated in consolidation.

44

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2014

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	18		$	1,455		$	643		$	—		$	2,116
Funds deposited by counterparties	9			63			—			—			72
Restricted cash	5			451			1			—			457
Accounts receivable, net	924			392			6			—			1,322
Inventory	537			710			—			—			1,247
Derivative instruments	1,657			1,209			—			(441		)	2,425
Accounts receivable - affiliate	7,449			1,988			(5,991		)	(3,437		)	9
Cash collateral paid in support of energy risk management activities	114			73			—			—			187
Renewable energy grant receivable	—			134			1			—			135
Prepayments and other current assets	94			175			343			—			612
Total current assets	10,807			6,650			(4,997		)	(3,878		)	8,582
Net Property, Plant and Equipment	8,344			13,877			171			(25		)	22,367
Other Assets
Investment in subsidiaries	140			2,293			23,410			(25,843		)	—
Equity investments in affiliates	(18		)	891			—			(102		)	771
Capital leases and notes receivable, less current portion	1			60			109			(98		)	72
Goodwill	1,921			653			—			—			2,574
Intangible assets, net	765			1,806			2			(6		)	2,567
Nuclear decommissioning trust fund	585			—			—			—			585
Deferred income taxes	(247		)	816			837			—			1,406
Derivative instruments	242			288			1			(51		)	480
Non-current assets held for sale	—			17			—			—			17
Other non-current assets	113			623			508			—			1,244
Total other assets	3,502			7,447			24,867			(26,100		)	9,716
Total Assets	$	22,653		$	27,974		$	20,041		$	(30,003	)	$	40,665
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	444		$	127		$	(98	)	$	474
Accounts payable	598			416			46			—			1,060
Accounts payable — affiliate	1,588			2,447			(598		)	(3,437		)	—
Deferred Income Taxes	7			—			(7		)	—			—
Derivative instruments	1,532			963			—			(441		)	2,054
Cash collateral received in support of energy risk management activities	9			63			—			—			72
Accrued expenses and other current liabilities	283			498			418			—			1,199
Total current liabilities	4,018			4,831			(14		)	(3,976		)	4,859
Other Liabilities
Long-term debt and capital leases	307			11,226			8,367			—			19,900
Nuclear decommissioning reserve	310			—			—			—			310
Nuclear decommissioning trust liability	333			—			—			—			333
Deferred income taxes	1,036			(1,012		)	(3		)	—			21
Derivative instruments	248			241			—			(51		)	438
Out-of-market contracts	111			1,133			—			—			1,244
Other non-current liabilities	465			795			314			—			1,574
Total non-current liabilities	2,810			12,383			8,678			(51		)	23,820
Total Liabilities	6,828			17,214			8,664			(4,027		)	28,679
2.822% Preferred Stock	—			—			291			—			291
Redeemable noncontrolling interest in subsidiaries	—			19			—			—			19
Stockholders’ Equity	15,825			10,741			11,086			(25,976		)	11,676
Total Liabilities and Stockholders’ Equity	$	22,653		$	27,974		$	20,041		$	(30,003	)	$	40,665

(a) All significant intercompany transactions have been eliminated in consolidation.

45

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated Balance
	(In millions)
Cash Flows from Operating Activities
Net Cash Provided by Operating Activities	$	446		$	430		$	(886	)	$	401		$	391
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	(405		)	4			401			—			—
Acquisition of businesses, net of cash acquired	—			(25		)	(193		)	—			(218		)
Capital expenditures	(73		)	(162		)	(2		)	—			(237		)
(Increase)/decrease in restricted cash, net	—			3			—			—			3
Increase in restricted cash — U.S. DOE projects	(4		)	60			—			—			56
Decrease/(increase) in notes receivable	—			1			—			—			1
Investments in nuclear decommissioning trust fund securities	(188		)	—			—			—			(188		)
Proceeds from sales of nuclear decommissioning trust fund securities	183			—			—			—			183
Proceeds from renewable energy grants	—			387			—			—			387
Proceeds from sale of assets	—			—			77			—			77
Cash proceeds to fund cash grant bridge loan payment	—			57			—			—			57
Other	7			(4		)	—			—			3
Net Cash (Used)/Provided by Investing Activities	(480		)	321			283			—			124
Cash Flows from Financing Activities
Proceeds from intercompany loans	—			—			401			(401		)	—
Payment of dividends to preferred stockholders	—			—			(41		)	—			(41		)
Net (payment for)/receipts from settlement of acquired derivatives that include financing elements	—			(223		)	—			—			(223		)
Proceeds from issuance of long-term debt	—			464			1,100			—			1,564
Proceeds from issuance of common stock	—			—			3			—			3
Sale proceeds and other contributions from noncontrolling interest in subsidiaries	—			9			—			—			9
Payment of debt issuance costs	—			(9		)	(14		)	—			(23		)
Payments for short and long-term debt	—			(405		)	(468		)	—			(873		)
Net Cash (Used)/Provided by Financing Activities	—			(164		)	981			(401		)	416
Effect of exchange rate changes on cash and cash equivalents	—			2			—			—			2
Net (Decrease)/Increase in Cash and Cash Equivalents	(34		)	589			378			—			933
Cash and Cash Equivalents at Beginning of Period	56			870			1,328			—			2,254
Cash and Cash Equivalents at End of Period	$	22		$	1,459		$	1,706		$	—		$	3,187

(a) All significant intercompany transactions have been eliminated in consolidation.

46

ITEM 2 — MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

As you read this discussion and analysis, refer to NRG's Condensed Consolidated Statements of Operations to this Form 10-Q, which present the results of operations for the three months ended March 31, 2015 and 2014. Also refer to NRG's 2014 Form 10-K, which includes detailed discussions of various items impacting the Company's business, results of operations and financial condition, including: Introduction and Overview section which provides a description of NRG's business segments; NRG's Business Strategy section; Business section, including how regulation, weather, and other factors affect NRG's business; and Critical Accounting Policies and Estimates section.

The discussion and analysis below has been organized as follows:

• Executive summary, including introduction and overview, business strategy, and changes to the business environment during the period, including environmental and regulatory matters;

• Results of operations;

• Financial condition, addressing liquidity position, sources and uses of liquidity, capital resources and requirements, commitments, and off-balance sheet arrangements; and

• Known trends that may affect NRG's results of operations and financial condition in the future.

47

Executive Summary

Introduction and Overview

NRG Energy, Inc., or NRG or the Company, is a competitive power company, which produces, sells and delivers energy and energy products and services in major competitive power markets primarily in the U.S. while positioning itself as a leader in the way residential, industrial and commercial consumers think about and use energy products and services. NRG is responding to a consumer-driven change to the U.S. energy industry by offering cleaner, smarter and ultimately more portable energy while enabling personal energy choice, building on the strength of one of the nation’s largest and most diverse competitive power generation portfolios. The Company owns and operates approximately 51,000 MWs of generation; engages in the trading of wholesale energy, capacity and related products; transacts in and trades fuel and transportation services; and directly sells energy, services, and innovative, sustainable products and services to retail customers under the name “NRG” and various other retail brand names owned by NRG.

The following table summarizes NRG's global generation portfolio as of March 31, 2015, by operating segment:

	Global Generation Portfolio by Operating Segment(a)
	(In MW)
	NRG Business
	Gulf Coast	East	West	NRG Home Solar(b)	NRG Renew		NRG Yield(c)		Total Domestic		Other(Inter-national)	Total Global
Primary Fuel-type
Natural gas(d)	8,084	7,744	6,496	—	—		1,878		24,202		144	24,346
Coal	5,689	11,045	—	—	—		—		16,734		605	17,339
Oil	—	5,818	—	—	—		190		6,008		—	6,008
Nuclear	1,176	—	—	—	—		—		1,176		—	1,176
Wind	—	—	—	—	1,680		1,332		3,012		—	3,012
Utility Scale Solar	—	—	—	—	807		343		1,150		—	1,150
Distributed Solar	—	—	—	55	42		10		107		—	107
Total generation capacity	14,949	24,607	6,496	55	2,529		3,753		52,389		749	53,138
Capacity attributable to noncontrolling interest	—	—	—	—	(630	)	(1,678	)	(2,308	)	—	(2,308	)
Total net generation capacity	14,949	24,607	6,496	55	1,899		2,075		50,081		749	50,830

(a) Includes 93 active fossil fuel and nuclear plants, 14 Utility Scale Solar facilities, 35 wind farms and multiple Distributed Solar facilities. All Utility Scale Solar and Distributed Solar facilities are described in MWs on an alternating current basis. MW figures provided represent nominal summer net megawatt capacity of power generated as adjusted for the Company's owned or leased interest excluding capacity from inactive/mothballed units.

(b) Includes the aggregate production capacity of installed and activated residential solar energy systems.

(c) Does not include NRG Yield, Inc.'s thermal converted (MWt) capacity, which is part of the NRG Yield operating segment.

(d) Natural gas generation portfolio does not include 463 MW related to Osceola which was mothballed on January 1, 2015 and 636 MW related to Coolwater which was retired on January 1, 2015.

NRG's Business Strategy

NRG's business strategy, summarized in “Enhance Generation, Expand Retail and Go Green while engaging in Smart Capital Allocation” is to maximize stockholder value through the production and sale of safe, reliable and affordable power to its customers in the markets served by the Company, while aggressively positioning the Company to meet the market's increasing demand for sustainable, low carbon and portable energy solutions individualized for the benefit of the end use energy consumer. This strategy is intended to enable the Company to achieve substantial sustainable growth at reasonable margins while de-risking the Company in terms of reduced and mitigated exposure both to "environmental risk" and cyclical commodity price risk. At the same time, the Company's relentless commitment to safety for its employees, customers and partners continues unabated.

The Company believes that the U.S. energy industry is going to be increasingly impacted by the long-term societal trend towards sustainability, which is both generational and irreversible. Moreover, it further believes the information technology driven revolution, increasingly wireless and thus portable, has enabled greater and easier personal choice in other sectors of the consumer economy, will do the same in the U.S. energy sector over the years to come. Finally, NRG believes that the aging and static transmission and distribution infrastructure of the national grid is becoming increasingly inadequate in the face of the more extreme weather demands of the 21st century. As a result, the Company expects energy consumers to secure increased personal control over their energy choices in the future. Nevertheless, as the Company shifts to respond to these trends that are playing out over time, the Company's immediate imperative every day remains to serve its customers and the markets in which it operates with safe, affordable, reliable and increasingly sustainable power.

48

To address these trends and effectuate the Company’s strategy, NRG is focused on: (i) excellence in operating performance of its existing assets including repowering its power generation assets at premium sites and optimal hedging of generation assets and retail load operations; (ii) serving the energy needs of end-use residential, commercial and industrial customers in competitive markets through multiple brands and channels with a variety of retail energy products and services differentiated by innovative features, premium service, sustainability, and loyalty/affinity programs; (iii) investing in, and deploying, alternative energy technologies both in its wholesale portfolio through its wind and solar portfolio and, particularly, in and around its retail businesses and its customers as it transforms this part of its business into a technology-driven provider of retail energy services; and (iv) engaging in a proactive capital allocation plan focused on achieving the regular return of and on stockholder capital within the dictates of prudent balance sheet management; including pursuing selective acquisitions, joint ventures, divestitures and investments. The Company's progress in each of these areas are more fully described in Item 1, Business of the Company's 2014 Form 10-K, and this Form 10-Q.

To further enhance the Company’s strategy, the Company's businesses and personnel are organized based upon the basis of their key target customer segments. The businesses include NRG Business, NRG Home and NRG Renew. In addition, NRG Carbon 360 and NRG eVgo are two distinct businesses that have dedicated management and are organized separately within NRG because of their distinct capital structure, success metrics and competitive environment but are supportive of and closely coordinated with NRG's core businesses. These five companies, plus NRG Yield, Inc., collectively represent the "NRG Group of Companies".

In support of the Company's strategy, the following events have occurred to date during 2015:

• During the first quarter of 2015, the Company's board of directors authorized the repurchase of $100 million of the Company's common stock as part of the Company's 2015 Capital Allocation Program. The repurchase program is in addition to the $100 million repurchase program announced in December 2014 and completed in February 2015. In addition, in the second quarter of 2015, the Company's board of directors authorized the repurchase of an additional $81 million of the Company's common stock.

• The Company sold the following facilities to NRG Yield, Inc.: Walnut Creek, the Tapestry projects (Buffalo Bear, Pinnacle and Taloga) and Laredo Ridge. NRG Yield, Inc. paid total cash consideration of $489 million, including $9 million for working capital adjustments, plus assumed project level debt of $737 million.

• NRG Yield, Inc.’s board of directors approved amendments to the NRG Yield, Inc. certificate of incorporation that would adjust NRG Yield Inc.'s capital structure by creating two new classes of capital stock, Class C common stock and Class D common stock and distribute shares of the proposed Class C and Class D common stock to holders of NRG Yield Inc.'s outstanding Class A and Class B common stock, respectively, through a stock split. The amendments were approved by the NRG Yield, Inc. stockholders at the NRG Yield, Inc. Annual Meeting of Stockholders held on May 5, 2015 and the recapitalization is expected to become effective on or around May 14, 2015. The recapitalization enhances NRG Yield, Inc.’s ability to focus on growth opportunities without the constraints of NRG’s capital allocation to NRG Yield, Inc., while maintaining NRG Yield, Inc.'s relationship with NRG. The recapitalization preserves NRG’s management and operational expertise, asset development and acquisition track record, financing experience and provides flexibility for NRG Yield, Inc. to raise capital to fund its growth.

The Class C common stock and Class D common stock will have the same rights and privileges and rank equally, share ratably and be identical in all respects to the shares of Class A common stock and Class B common stock, respectively, as to all matters, except that each share of Class C common stock and Class D common stock will be entitled to 1/100th of a vote on all stockholder matters.

In connection with the amendments described above, NRG agreed to amend the Right of First Offer Agreement to make additional assets available to NRG Yield, Inc. should NRG choose to sell them, including (i) two natural gas facilities totaling 795 MW of net capacity that are expected to reach COD in 2017 and 2020; (ii) an equity interest in a wind portfolio that includes wind facilities totaling approximately 934 MW of net capacity; and (iii) up to $250 million of equity interests in one or more residential or distributed solar generation portfolios developed by affiliates of NRG.

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• In April 2015, NRG and NRG Yield, Inc. announced the formation of a partnership that will invest in and hold operating portfolios of residential solar assets developed by NRG Home Solar, including: (i) an existing, unlevered portfolio of over 2,200 leases across nine states representing approximately 17 MW with a weighted average remaining lease term of approximately 17 years which NRG Yield, Inc. invested $26 million in April 2015; (ii) an in-development, tax equity financed portfolio of between 6,000 to 7,000 leases across at least ten states representing approximately 48 MW with a lease term of 20 years; and (iii) an in-development tax equity financed portfolio of 5,500 to 6,500 leases representing approximately 42 MW with a lease term of 20 years. As part of the agreement, NRG will periodically monetize its residential leases through equity investments by NRG Yield, Inc. in NRG RPV Holdco 1 LLC. NRG will retain a 5% residual economic interest in the portfolio and act as managing member of the partnership. Allocations of income and cash will be 5% to NRG and 95% to NRG Yield, Inc. over the contracted life of the investments. Once NRG Yield, Inc. reaches its expected return on its investment, which is expected to be achieved consistent with the expiry of the remaining lease term, allocations of income and cash thereafter will be 95% to NRG and 5% to NRG Yield, Inc. NRG also has an option to purchase NRG Yield, Inc.'s interest at fair value after the flip date occurs. NRG Yield, Inc. has committed to invest up to $150 million of cash contributions into the partnership over time, excluding the $26 million noted above.

• NRG and NRG Yield, Inc. plan to form a new partnership that will invest in and hold operating portfolios of distributed solar assets developed by NRG Renew. The partnership will allow NRG to periodically monetize its distributed solar investments and NRG Yield, Inc. to invest in a growing segment of the solar market.

Under the terms of the partnership agreement, NRG Yield, Inc. will receive 95% of the economics until achieving a targeted return, expected to be achieved commensurate with the end of the customer contract period, after which NRG will receive 95% of the economics. NRG Yield, Inc. has initially committed to invest up to $100 million of cash equity into the partnership over time. While none of the commitment has been utilized to date, the partnership is expected to be fully invested over the next 18 months.

• The Company announced that NRG Renew has entered into an agreement with Kaiser Permanente, one of the nation's largest not-for-profit healthcare providers, to utilize as much as 70 MWs of on-site solar energy to help Kaiser Permanente achieve its greenhouse gas emission reduction goals. The Company also announced that NRG Renew and SunShare are partnering to finance and build 8.2 MWs of community solar projects along the Front Range of Colorado.

Wind Resource Availability

In the first quarter of 2015, the Company's results were impacted by lower than normal wind resource availability. While the Company's wind facilities were available, adverse weather trends had a negative impact on wind resources. The Company cannot predict the impact of this trend on future performance or results.

Regulatory Matters

The Company’s regulatory matters are described in the Company’s 2014 Form 10-K in Item 1, Business — Regulatory Matters. These matters have been updated below and in Note 14, Regulatory Matters, to the Condensed Consolidated Financial Statements of this Form 10-Q as found in Item 1.

As owners of power plants and participants in wholesale and retail energy markets, certain NRG entities are subject to regulation by various federal and state government agencies. These include the CFTC, FERC, NRC, and the PUCT, as well as other public utility commissions in certain states where NRG's generating, thermal, or distributed generation assets are located. In addition, NRG is subject to the market rules, procedures and protocols of the various ISO and RTO markets in which it participates. Likewise, certain NRG entities participating in the retail markets are subject to rules and regulations established by the states in which NRG entities are licensed to sell at retail. NRG must also comply with the mandatory reliability requirements imposed by NERC and the regional reliability entities in the regions where the Company operates.

NRG's operations within the ERCOT footprint are not subject to rate regulation by FERC, as they are deemed to operate solely within the ERCOT market and not in interstate commerce. These operations are subject to regulation by the PUCT, as well as to regulation by the NRC with respect to the Company's ownership interest in STP.

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Federal Regulation

Court Rejects FERC’s Jurisdiction Over Demand Response — On May 23, 2014, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s rules (known as Order No. 745) that allowed demand response resources to participate in FERC-jurisdictional energy markets. The Court of Appeals held that the Federal Power Act does not authorize FERC to exercise jurisdiction over demand response and that instead demand response is part of the retail market over which the states have jurisdiction. The specific order being challenged related to energy market compensation, but this ruling also calls into question whether demand response will be permitted to participate in the capacity markets in the future. Parties including the U.S. Solicitor General have filed petitions for a writ of certiorari with the U.S. Supreme Court. On May 4, 2015, the U.S. Supreme Court granted certiorari on two questions: first, on whether the FPA gives FERC jurisdiction over demand response, and second, whether FERC’s Order No. 745 correctly determined the level of compensation paid to generators participating in the energy markets. The eventual outcome of this proceeding could result in refunds of payments made for non-jurisdictional services and resettlement of wholesale markets, but it is not possible to predict the outcome or estimate the impact on the Company at this time.

East Region

PJM

New Jersey and Maryland's Generator Contracting Programs — The New Jersey Board of Public Utilities and the Maryland Public Service Commission awarded long-term power purchase contracts to generation developers to encourage the construction of new generation capacity in the respective states. The constitutionality of the long-term contracts was challenged and the U.S. District Court for the District of New Jersey (in an October 25, 2013, decision) and the U.S. District Court for the District of Maryland (in an October 24, 2013, decision) found that the respective contracts violated the Supremacy Clause of the U.S. Constitution and were preempted. On June 30, 2014, the U.S. Court of Appeals for the Fourth Circuit affirmed the Maryland District Court's decision. On September 11, 2014, the U.S. Court of Appeals for the Third Circuit affirmed the New Jersey District Court's decision. Various parties filed petitions for a writ of certiorari seeking U.S. Supreme Court review of both cases. On March 23, 2015, the U.S. Supreme Court requested the views of the U.S. Solicitor General. The outcome of this litigation and the validity of the contracts may affect future capacity prices in PJM.

Capacity Performance Proposal — On December 14, 2014, PJM requested FERC approval to substantially revamp its capacity market. Under that proposal, future annual capacity auctions would procure two categories of capacity resources: Capacity Performance resources and Base Capacity resources. PJM also would institute substantial new performance penalties on Capacity Performance resources that do not perform in real time during specified periods of high demand and substantially modify capacity bidding rules. On March 31, 2015, FERC issued a deficiency letter requesting additional information. On April 10, 2015, PJM responded to the deficiency letter and proposed amendments to its initial proposal. PJM requested that FERC approve its Capacity Performance proposal by June 9, 2015. FERC action on any PJM Capacity Performance proposal is likely to have a material impact on future PJM capacity prices.

On April 7, 2015, PJM submitted a request for waiver of its tariff to permit a delay of its next Base Residual Auction for a short period to allow FERC an opportunity to review and then issue an order on the pending Capacity Performance filing prior to the next Base Residual Auction. On April 24, 2015, FERC granted PJM’s request to defer the 2015 Base Residual Auction for the 2018/2019 Delivery Year until a week that is 30 to 75 days after a FERC order on PJM’s Capacity Performance proposal, but no later than the week ending August 14, 2015.

PJM “Stop Gap” Demand Response Filing— On January 14, 2015, PJM filed to implement “stop gap” rules governing the participation of demand response in the upcoming capacity auction (for the 2018/2019 delivery year), which would take effect only if the U.S. Supreme Court denies certiorari of the EPSA v. FERCdecision.  Under the proposed new rules, PJM would prohibit demand response from participating in PJM’s capacity auction as a supply-side resource.  Instead, PJM proposed to create a new product, termed Wholesale Load Reduction, that would allow LSEs to bid reductions in demand, backed by physical demand response resources, into the auction.  Demand response resources participating as Wholesale Load Reduction would have a comparable impact on capacity clearing prices as demand response participating as supply, on a megawatt for megawatt basis.  The Company opposed PJM’s proposal. On March 31, 2015, FERC issued an order rejecting PJM's filing as premature. 

New England

FCM Rules for 2014 Forward Capacity Auction — On February 28, 2014, ISO-NE filed with FERC the results of Forward Capacity Auction 8. On September 16, 2014, FERC issued a notice stating that the Forward Capacity Auction 8 results would go into effect by operation of law. Several parties requested rehearing of FERC’s notice. FERC rejected those requests on legal and procedural grounds. The matter was appealed to the U.S. Court of Appeals for the District of Columbia Circuit. On April 10, 2015, the U.S. Court of Appeals for the District of Columbia Circuit referred the matter to a full merits panel.

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Complaint Against ISO-NE — On April 6, 2015, GEM filed a complaint against ISO-NE regarding ISO-NE’s conduct of the third Annual Reconfiguration Auction.  The Canal 2 unit suffered a transformer failure which significantly restricted the output of the facility.  The transformer was repaired in July 2014 and the unit was brought back to its full output.  ISO-NE, however, failed to recognize that the unit had been repaired and mistakenly submitted a capacity buy-bid for the 2015-2016 capacity year in the amount of the derate.  ISO-NE has denied the allegations.

New York

Demand Curve Reset and the Lower Hudson Valley Capacity Zone — On May 27, 2014, FERC denied rehearing and phase-in requests regarding its August 13, 2013, order on the creation of the Lower Hudson Valley Capacity Zone. The NYISO had previously approved the creation of a new Lower Hudson Valley Capacity Zone in New York, as part of the NYISO’s triennial adjustment of its capacity market parameters for the 2014-2017 period. The State of New York, NYSPSC and Central Hudson Gas & Electric Corp. challenged the FERC order before the U.S. Court of Appeals for the Second Circuit. The U.S. Court of Appeals for the Second Circuit held oral argument on September 12, 2014. The U.S. Court of Appeals for the Second Circuit upheld FERC's order creating the Lower Hudson Valley Capacity Zone as a separate capacity load zone.

Dunkirk Power Reliability Service —On March 14, 2012, Dunkirk Power filed a notice with the NYSPSC of its intent to mothball the Dunkirk Station no later than September 10, 2012.  The effects of the mothball on electric system reliability were reviewed by Niagara Mohawk Power Corporation, d/b/a National Grid.  As a result of those studies, National Grid determined that the mothball of the Dunkirk Station would have a negative impact on the reliability of the New York transmission system and that portions of the Dunkirk Station may be retained for reliability purposes via a non-market compensation arrangement.  On July 20, 2012, National Grid and Dunkirk Power agreed on the material terms for a bilateral RSSA and submitted those terms to the NYSPSC for rate recovery in National Grid's rates. On August 16, 2012, the NYSPSC approved terms and on August 27, 2012, Dunkirk Power and National Grid entered into the RSSA that began on September 1, 2012, and expired on May 31, 2013. In late 2012, National Grid issued a request for proposals with respect to its reliability need in the Dunkirk area for the two years beginning June 1, 2014. Dunkirk Power submitted a proposal and signed a second, two-year, contract on March 4, 2013, pursuant to which one unit (Unit 2) at Dunkirk will continue operating through May 31, 2015. The contract was submitted to the NYSPSC in March 2013 and approved in May 2013. On March 2, 2015, National Grid filed a request for NYSPSC approval of a seven-month extension of the RSSA with Dunkirk (to December 31, 2015) of the March 4, 2013 RSSA.  The matter is pending before the NYSPSC.

On July 12, 2012, Dunkirk Power filed a RMR agreement with FERC to protect the Company’s interests in the event National Grid and Dunkirk Power could not come to terms on a bilateral agreement for reliability support services. On February 19, 2015, FERC rejected the RMR agreement as unnecessary and clarified in a related docket that it was not intending to review either RSS agreement.

FERC Investigation of NYISO RMR Practices — On February 19, 2015, pursuant to Section 206 of the FPA, FERC found NYISO’s tariff to be unjust and unreasonable because it does not contain provisions governing the retention of and compensation to generating units for reliability. FERC ordered NYISO to adopt tariff provisions containing a proposed RMR rate schedule and pro forma RMR agreement within 120 days of the date of the FERC’s order. However, FERC clarified that NYISO’s RMR proposal will not require Dunkirk to enter into new pro forma agreements for the 2012 and 2013 RSSAs. On March 23, 2015, the NYSPSC filed a request for rehearing and a group of New York transmission owners filed a request for clarification.

Dunkirk Natural Gas Addition — On February 13, 2014, Dunkirk Power LLC and National Grid agreed to a term sheet for a 10-year agreement to govern the addition of natural gas-burning capabilities to the Dunkirk facility. This term sheet, known as the DNG Agreement Term Sheet, was approved by the NYSPSC on June 13, 2014.  On February 27, 2015, Entergy filed a complaint in the Northern District of New York alleging that the NYSPSC’s approval of the DNG Agreement Term Sheet represents an impermissible interference with FERC’s exclusive jurisdiction over the wholesale markets.  On April 20, 2015, Dunkirk Power LLC filed an unopposed motion to become a party to the proceeding.  Briefing is ongoing.

Independent Power Producers of New York (IPPNY) Complaint — On May 10, 2013, a generator trade association in New York filed a complaint at FERC against the NYISO. The generators asked FERC to direct the NYISO to require that capacity from existing generation resources that would have exited the market but for out-of-market payments under RMR type agreements be excluded from the capacity market altogether or be offered at levels no lower than the resources' going-forward costs. The complaints point to the recent reliability services agreements entered into between the NYSPSC and generators, including Dunkirk Power, as evidence that capacity market prices are being influenced by non-market considerations. The complainants seek to prevent below-cost offers from artificially suppressing prices in the New York Control Area Installed Capacity Spot Market Auction.

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On March 25, 2014, the generators filed an Amended Complaint against the NYISO in light of the executed term sheet between Niagara Mohawk Power Corporation d/b/a National Grid and Dunkirk Power, which was filed at NYPSC in February 2014. Under the term sheet, National Grid and Dunkirk Power are to enter into a definitive agreement pursuant to which Dunkirk Power will undertake a gas addition project to enable Units 2-4 to run on natural gas in exchange for payments from National Grid over a 10-year term.

On March 19, 2015, FERC denied IPPNY’s complaint and directed NYISO to establish a stakeholder process to consider whether there are circumstances that warrant the adoption of buyer-side mitigation rules in the rest-of-state, and whether mitigation measures would need to be in place to address any price suppressing effects of repowering agreements.

Competitive Entry Exemption to Buyer-Side Mitigation Rules — On December 4, 2014, pursuant to Section 206 of the FPA, a group of New York transmission owners filed a complaint seeking a competitive entry exemption to the current NYISO Buyer-Side Mitigation rules. On December 16, 2014, TDI USA Holdings Corporation filed a complaint under Section 206 against the NYISO claiming that the NYISO’s application of the Mitigation Exemption Test under the Buyer-Side Mitigation Rules to TDI’s Champlain Hudson 1,000 MW transmission line project is unjust and unreasonable and seeks an exemption from the Mitigation Exemption Test. On February 26, 2015, FERC granted the complaint filed by the New York transmission owners and directed the NYISO to adopt a competitive entry exemption into its tariff within 30 days.  In a companion order issued on the same day, FERC rejected the TDI complaint on the grounds that TDI’s concerns were adequately addressed by FERC’s first order.  On March 30, 2015, NRG filed a request for rehearing. Allowing a competitive entry exemption significantly degrades protections against uneconomic entry into the New York markets.

New York In-City Mitigation —On April 16, 2015, FERC issued an order on clarification and rehearing that established a mitigation bid floor for the Astoria Energy II generating unit, built in New York City in response to a NYPA-sponsored RFP.  FERC initially held that Astoria Energy II’s bid floor would incorporate a proxy cost of capital. In this order, FERC directs NYISO to recalculate the NYPA bid floor to reflect its lower actual cost of capital.  However, Astoria Energy II’s mitigation has rolled off and FERC’s order did not specify whether it intended its action was intended to be moot or to be applied retroactively.  FERC's order could have implications for the price of capacity in New York City.

Gulf Coast Region

ERCOT

Houston Import Project — At its April 8, 2014, meeting, the ERCOT Board endorsed a new 345 kV transmission line project designed to address purported reliability challenges related to congestion between north Texas into the Houston region. On November 14, 2014, the PUCT denied a challenge by the Company and Calpine Corp. regarding ERCOT's endorsement of the project. On April 24, 2015, the transmission owners filed for approval to amend their certificates of convenience and necessity with the PUCT to obtain the authorization to move forward with the project. The Company is continuing to contest ERCOT’s recommendation that the proposed line is needed for reliability purposes.

MISO

MATS Waiver — Indianapolis Power and Light Company, DTE Electric Company, MidAmerican Energy Company, Duke Energy Indiana, Inc., Consumers Energy Company, and Wisconsin Power & Light Company each separately requested a limited, one-time waiver from their obligations to meet the Resource Adequacy Requirement in the MISO tariff, addressing an approximate six-week gap between the EPA’s MATS compliance deadline and the end of MISO’s 2015-2016 capacity planning year. The EPA’s MATS rules establish limits for HAPs emitted from, among other sources, existing and planned coal-fired generators and went into effect on April 16, 2015, with a one-year compliance extension available. Because the MISO capacity planning year runs from June 1 to May 31, there is a gap between the MATS-driven retirements in April and the MISO planning year in June.

FERC granted several of the utilities' requests for the limited, one-time waivers, some of which continue to be contested on rehearing. These waivers distort the efficient operation of MISO's capacity market.

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West Region

CAISO

Carlsbad Energy Center — On March 6, 2015, an Administrative Law Judge at the CPUC issued a proposed decision which would deny approval of the 20-year PPTA between SDG&E and NRG tied to the proposed Carlsbad Energy Center. On April 6, 2015, the President of the CPUC issued an alternate proposed decision which would conditionally approve a PPTA for capacity from the proposed Carlsbad Energy Center subject to two conditions: (1) that the project contract capacity be reduced from 600 MWs to 500 MWs and that (2) all of the remaining 100 MWs in residual procurement authority resulting from the amendment of the PPTA consist of preferred resources or energy storage. Both the proposed decision and the CPUC President’s alternate proposed decision are scheduled to go before the CPUC for a vote on May 21, 2015.

California Station Power — On December 18, 2012, the U.S. Court of Appeals for the District of Columbia Circuit upheld a decision by FERC disclaiming jurisdiction over how the states impose retail station power charges. This decision allowed the CPUC to establish retail charges for future station power consumption. Due to reservation-of-rights language in the California utilities' state-jurisdictional station power tariffs, the District Court's ruling arguably requires California generators to pay state-imposed retail charges back to the date of enrollment by the facilities in the CAISO's station period program. The CPUC approved revised station power tariffs in the SDG&E and PG&E service territories effective August 30, 2010. On April 10, 2015, the CPUC denied the final rehearing of the matter.

Environmental Matters

NRG is subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require governmental authorizations to build and operate power plants. NRG is also subject to laws and regulations surrounding the protection of wildlife, including migratory birds, eagles and threatened and endangered species. Environmental laws have become increasingly stringent and NRG expects this trend to continue. The electric generation industry is likely to face new and more stringent requirements to address various emissions, including GHGs, as well as combustion byproducts, water discharge and use, and threatened and endangered species. In general, the Company expects future laws to require adding emissions controls or other environmental controls or to impose more restrictions on the operations of the Company's facilities, which could have a material effect on operations. The Company’s environmental matters are described in the Company’s 2014 Form 10-K in Item 1, Business — Environmental Matters. These matters have been updated in Note 15, Environmental Matters, to the Condensed Consolidated Financial Statements of this Form 10-Q as found in Item 1.

Changes in Accounting Standards

See Note 2, Summary of Significant Accounting Policies, to this Form 10-Q as found in Item 1 for a discussion of recent accounting developments.

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Consolidated Results of Operations

The following table provides selected financial information for the Company:

	Three months ended March 31,
(In millions except otherwise noted)	2015			2014			Change %
Operating Revenues
Energy revenue (a)	$	1,676		$	1,638		2	%
Capacity revenue (a)	488			501			(3	)
Retail revenue	1,663			1,525			9
Mark-to-market for economic hedging activities	(87		)	(331		)	74
Contract amortization	(8		)	4			(300	)
Other revenues (b)	94			149			(37	)
Total operating revenues	3,826			3,486			10
Operating Costs and Expenses
Cost of sales (c)	2,134			2,222			(4	)
Mark-to-market for economic hedging activities	191			(63		)	403
Contract and emissions credit amortization (c)	4			15			(73	)
Other cost of operations	733			563			30
Total cost of operations	3,062			2,737			12
Depreciation and amortization	395			335			18
Selling, general and administrative	263			222			18
Acquisition-related transaction and integration costs	10			12			(17	)
Development activity expenses	34			19			79
Total operating costs and expenses	3,764			3,325			13
Gain on postretirement benefits curtailment and sale of assets	14			19			(26	)
Operating Income	76			180			(58	)
Other Income/(Expense)
Equity in earnings of unconsolidated affiliates	(3		)	7			143
Other income, net	19			11			73
Loss on debt extinguishment	—			(41		)	(100	)
Interest expense	(301		)	(255		)	18
Total other expense	(285		)	(278		)	3
Loss before Income Taxes	(209		)	(98		)	(113	)
Income tax benefit	(73		)	(31		)	135
Net Loss	(136		)	(67		)	(103	)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interest	(16		)	(11		)	(45	)
Net Loss Attributable to NRG Energy, Inc.	$	(120	)	$	(56	)	(114	)
Business Metrics
Average natural gas price — Henry Hub ($/MMBtu)	$	2.98		$	4.94		(40	)%

(a) Includes realized gains and losses from financially settled transactions.

(b) Includes unrealized trading gains and losses.

(c) Includes amortization of SO₂ and NO_x credits and excludes amortization of RGGI credits.

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Management’s discussion of the results of operations for the three months ended March 31, 2015 and 2014

Loss before income taxes — The pre-tax loss of $209 million for the three months ended March 31, 2015, compared to pre-tax loss of $98 million for the three months ended March 31, 2014, primarily reflects:

• an increase in gross margin of $205 million comprised of an increase in NRG Business gross margin of $21 million, an increase in NRG Home Retail gross margin of $73 million, a decrease in NRG Home Solar gross margin of $1 million, an increase in NRG Yield gross margin of $59 million and an increase in NRG Renew gross margin of $53 million; and

• a net increase in operating costs of $316 million including operations and maintenance expense, depreciation and amortization, selling, general and administrative costs, and interest expense.

Net loss — The increase in net loss of $69 million primarily reflects the drivers discussed above, including an income tax benefit for the three months ended March 31, 2015, of $73 million, compared to an income tax benefit of $31 million in the comparable period.

Electricity Prices

The following table summarizes average on-peak power prices for each of the major markets in which NRG operates for the three months ended March 31, 2015, and 2014:

	Average on Peak Power Price ($/MWh) (a)
	Three months ended March 31,
Region	2015		2014
Gulf Coast (b)
ERCOT - Houston	$	26.46	$	57.75
ERCOT - North	26.54		60.20
MISO - Louisiana Hub	37.25		66.96
East
NY J/NYC	81.54		156.12
NY A/West NY	53.77		105.40
NEPOOL	88.85		172.98
PEPCO (PJM)	61.53		133.16
PJM West Hub	57.40		112.30
West
CAISO - NP15	34.56		53.24
CAISO - SP15	32.76		53.77

(a) Average on peak power prices based on real time settlement prices as published by the respective ISOs.

(b) Gulf Coast region also transacts in PJM - West Hub.

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NRG Business gross margin

The following is a discussion of gross margin for NRG Business, adjusted to eliminate intersegment activity, primarily with NRG Home.

	Three months ended March 31, 2015
(In millions except otherwise noted)	Gulf Coast			East			West			B2B			Subtotal			Eliminations			Total
Energy revenue	$	616		$	1,095		$	24		$	—		$	1,735		$	—		$	1,735
Capacity revenue	58			319			37			—			414			—			414
Retail revenue	—			—			—			348			348			—			348
Other revenue	22			27			3			52			104			(16		)	88
Operating revenue	696			1,441			64			400			2,601			(16		)	2,585
Cost of sales	(351		)	(681		)	(17		)	(346		)	(1,395		)	—			(1,395		)
Gross Margin	$	345		$	760		$	47		$	54		$	1,206		$	(16	)	$	1,190
Business Metrics
MWh sold (in thousands) (a)	15,206			15,041			610
MWh generated (in thousands)	14,384			14,818			422
Electricity sales volume — GWh										4,586
Average customer count (in thousands, metered locations)										77
(a) MWh sold excludes generation at facilities that generate revenue under capacity agreements.

	Three months ended March 31, 2014
(In millions except otherwise noted)	Gulf Coast			East			West			B2B			Subtotal			Eliminations			Total
Energy revenue	$	617		$	1,166		$	50		$	—		$	1,833		$	—		$	1,833
Capacity revenue	80			305			61			—			446			—			446
Retail revenue	—			—			—			443			443			—			443
Other revenue	21			54			1			43			119			(13		)	106
Operating revenue	718			1,525			112			486			2,841			(13		)	2,828
Cost of sales	(413		)	(749		)	(46		)	(448		)	(1,656		)	—			(1,656		)
Gross Margin	$	305		$	776		$	66		$	38		$	1,185		$	(13	)	$	1,172
Business Metrics
MWh sold (in thousands) (a)	15,145			12,588			289
MWh generated (in thousands)	14,249			12,515			345
Electricity sales volume — GWh										5,412
Average customer count (in thousands, metered locations)										75
(a) MWh sold excludes generation at facilities that generate revenue under capacity agreements.
	Three months ended March 31,
Weather Metrics	Gulf Coast			East			West
2015
CDDs (a)	82			118			17
HDDs (a)	2,569			8,855			813
2014
CDDs	88			92			1
HDDs	2,623			8,489			873
10 year average
CDDs	179			96			1
HDDs	2,107			7,335			1,168

(a) National Oceanic and Atmospheric Administration-Climate Prediction Center - A Cooling Degree Day, or CDD, represents the number of degrees that the mean temperature for a particular day is above 65 degrees Fahrenheit in each region. A Heating Degree Day, or HDD, represents the number of degrees that the mean temperature for a particular day is below 65 degrees Fahrenheit in each region. The CDDs/HDDs for a period of time are calculated by adding the CDDs/HDDs for each day during the period.

57

NRG Business gross margin — increased by $21 million, including intercompany sales, during the three months ended March 31, 2015, compared to the same period in 2014, due to:

Increase in Gulf Coast region	$	40
Decrease in East region	(16		)
Decrease in West region	(19		)
Increase in B2B	16
	$	21

The increase in gross margin in the Gulf Coast region was driven by:

Higher gross margin due to higher average realized prices, reflecting realized gains on settled hedges	$	65
Lower gross margin due to the expiration of cooperative capacity contracts	(20		)
Lower gross margin due to lower coal generation	(11		)
Higher gross margin from an 8% increase in nuclear generation driven by reduced planned outages	6
	$	40

The decrease in gross margin in the East region was driven by:

Higher gross margin due to the EME acquisition in April 2014	$	121
Higher gross margin as a result of new contracts starting in Q2 2014 offset by a decrease in pricing for power purchases for existing load-serving contracts	36
Lower gross margin due to a 27% decrease in generation and a 9% decrease in realized energy prices offset by a reduction in natural gas prices	(100		)
Lower gross margin due to a 23% decrease in PJM hedged capacity prices resulting from lower cleared auction prices, partially offset by an increase of 33% in New York and New England hedged capacity prices driven by the new Lower Hudson Valley Capacity Zone.	(43		)
Changes in commercial optimization activities	(15		)
Other	(15		)
	$	(16	)

The decrease in gross margin in the West region was driven by:

Lower gross margin due to a drop in contracted capacity volumes due to decreased capacity demand and a decrease in prices	$	(23	)
Higher gross margin due to the EME acquisition in April 2014	9
Lower capacity gross margin due to the retirement of Coolwater	(4		)
Other	(1		)
	$	(19	)

The increase in B2B gross margin was driven by:

Higher gross margin due to lower supply costs	$	14
Higher gross margin for the energy services business	2
	$	16

58

NRG Home Retail gross margin

The following is a discussion of gross margin for NRG Home Retail.

	Three months ended March 31,
(In millions except otherwise noted)	2015			2014
Operating revenue	$	1,312		$	1,082
Cost of sales (a)	(971		)	(814		)
Gross Margin	$	341		$	268
Business Metrics
Electricity sales volume — GWh - Gulf Coast	7,549			6,616
Electricity sales volume — GWh - All other regions	2,614			1,217
Average NRG Home Retail customer count (in thousands) (b) (c)	2,815			2,228
NRG Home Retail customer count (in thousands) (b) (c)	2,784			2,381

(a) Includes intercompany purchases of $250 million and $366 million in 2015 and 2014.

(b) Excludes Discrete Customers.

(c) The March 31, 2014 period, excludes customers related to the electric business of Dominion, acquired on March 31, 2014.

NRG Home Retail gross margin increased $73 million for the three months ended March 31, 2015, compared to the same period in 2014, due to:

Favorable impact of lower supply costs on the higher sales volumes resulting from weather conditions in 2015	$	49
Increase in margins due primarily to lower supply costs and increased revenues from sales to Discrete Customers and Recurring Customers	24
	$	73

NRG Renew gross margin

The following is a discussion of gross margin for NRG Renew.

	Three months ended March 31,
	2015			2014
(In millions except otherwise noted)
Operating revenue	$	109		$	54
Cost of sales	(4		)	(2		)
Gross margin	$	105		$	52
Business Metrics
MWh sold (in thousands)	1,408			492
MWh generated (in thousands)	1,567			441

NRG Renew gross margin increased $53 million for the three months ended March 31, 2015, compared to the same period in 2014. The increase in gross margin was primarily a result of the EME acquisition in April 2014 and improved performance at the Ivanpah project.

59

NRG Yield gross margin

The following is a discussion of gross margin for NRG Yield.

	Three months ended March 31,
	2015			2014
(In millions except otherwise noted)
Operating revenue	$	185		$	140
Cost of sales	(21		)	(35		)
Gross margin	$	164		$	105
Business Metrics
MWh sold (in thousands)	767			283
MWht sold (in thousands)	617			667

NRG Yield gross margin increased $59 million for the three months ended March 31, 2015, compared the same period in 2014. The increase in gross margin was primarily related to the acquisition of the Alta Wind Assets in August 2014 as well as the acquisition of the Walnut Creek, Tapestry Wind and Laredo Ridge projects from NRG, which were acquired in the EME acquisition in April 2014.

Mark-to-market for Economic Hedging Activities

Mark-to-market for economic hedging activities includes asset-backed hedges that have not been designated as cash flow hedges and ineffectiveness on cash flow hedges. Total net mark-to-market results decreased by $10 million during the three months ended March 31, 2015, compared to the same period in 2014.

The breakdown of gains and losses included in operating revenues and operating costs and expenses by region was as follows:

	Three months ended March 31, 2015
				NRG Business
	NRG Home			Gulf Coast			East			West			B2B			NRG Renew		NRG Yield			Elimination(a)			Total
	(In millions)
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges	$	—		$	(150	)	$	(146	)	$	2		$	—		$	—	$	(2	)	$	(60	)	$	(356	)
Reversal of acquired gain positions related to economic hedges	—			—			(19		)	—			—			—		—			—			(19		)
Net unrealized gains/(losses) on open positions related to economic hedges	—			238			(13		)	4			1			—		9			49			288
Total mark-to-market gains/(losses) in operating revenues	$	—		$	88		$	(178	)	$	6		$	1		$	—	$	7		$	(11	)	$	(87	)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$	128		$	10		$	4		$	(1	)	$	41		$	—	$	—		$	60		$	242
Reversal of acquired gain positions related to economic hedges	(3		)	—			—			(4		)	—			—		—			—			(7		)
Net unrealized losses on open positions related to economic hedges	(157		)	(33		)	(79		)	—			(108		)	—		—			(49		)	(426		)
Total mark-to-market (losses)/gains in operating costs and expenses	$	(32	)	$	(23	)	$	(75	)	$	(5	)	$	(67	)	$	—	$	—		$	11		$	(191	)

(a) Represents the elimination of the intercompany activity between NRG Home, NRG Business and NRG Yield.

60

	Three months ended March 31, 2014
			NRG Business
	NRG Home		Gulf Coast			East			West			B2B			NRG Renew			NRG Yield		Elimination(a)			Total
	(In millions)
Mark-to-market results in operating revenues
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges	$	—	$	(52	)	$	21		$	—		$	—		$	1		$	—	$	(36	)	$	(66	)
Reversal of acquired gain positions related to economic hedges	—		—			(79		)	(1		)	—			—			—		—			(80		)
Net unrealized (losses)/gains on open positions related to economic hedges	—		(192		)	(181		)	(1		)	(1		)	(2		)	—		192			(185		)
Total mark-to-market (losses)/gains in operating revenues	$	—	$	(244	)	$	(239	)	$	(2	)	$	(1	)	$	(1	)	$	—	$	156		$	(331	)
Mark-to-market results in operating costs and expenses
Reversal of previously recognized unrealized losses on settled positions related to economic hedges	$	14	$	—		$	4		$	—		$	15		$	—		$	—	$	36		$	69
Reversal of acquired loss positions related to economic hedges	—		—			2			—			—			—			—		—			2
Net unrealized gains/(losses) on open positions related to economic hedges	90		5			(14		)	—			103			—			—		(192		)	(8		)
Total mark-to-market gains/(losses) in operating costs and expenses	$	104	$	5		$	(8	)	$	—		$	118		$	—		$	—	$	(156	)	$	63

(a) Represents the elimination of the intercompany activity between NRG Home, NRG Business, and NRG Renew.

Mark-to-market results consist of unrealized gains and losses. The settlement of these transactions is reflected in the same caption as the items being hedged.

The reversals of acquired gain or loss positions were valued based upon the forward prices on the acquisition date.

For the three months ended March 31, 2015, the $87 million loss in operating revenues from economic hedge positions was driven primarily by the reversal of previously recognized unrealized gains on contracts that settled during the period largely offset by an increase in value of open positions as a result of decreases in natural gas and ERCOT electricity prices. The $191 million loss in operating costs and expenses from economic hedge positions was driven primarily by a decrease in value of open positions as a result of decreases in natural gas, coal, and ERCOT electricity prices offset by the reversal of previously recognized unrealized losses on contracts that settled during the period.

For the three months ended March 31, 2014, the $331 million loss in operating revenues from economic hedge positions was driven primarily by a decrease in value of open positions as a result of increases in forward natural gas and power prices and by the reversal of previously recognized unrealized gains on existing and acquired contracts that settled during the period. The $63 million gain in operating costs and expenses from economic hedge positions was driven by the reversal of previously recognized unrealized losses on contracts that settled during the period partially offset by a decrease in value of open positions as a result of decreases in coal prices.

In accordance with ASC 815, the following table represents the results of the Company's financial and physical trading of energy commodities for the three months ended March 31, 2015, and 2014. The realized and unrealized financial and physical trading results are included in operating revenue. The Company's trading activities are subject to limits within the Company's Risk Management Policy and are primarily transacted through BETM.

	Three months ended March 31,
(In millions)	2015			2014
Trading gains/(losses)
Realized	$	25		$	43
Unrealized	(22		)	15
Total trading gains	$	3		$	58

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Other Operating Costs

	NRG Business								NRG Home Retail		NRG Home Solar		NRG		NRG		Eliminations
	Gulf Coast		East		West		B2B						Renew		Yield					Total
	(In millions)
Three months ended March 31, 2015	$	201	$	309	$	47	$	29	$	74	$	1	$	43	$	53	$	(24	)	$	733
Three months ended March 31, 2014	201		216		42		27		59		—		22		25		(29		)	563

Other operating costs increased by $170 million for the three months ended March 31, 2015, compared to the same period in 2014, due to:

Increase due to the acquisition of EME in April 2014 and Alta Wind in August 2014	$	120
Increase in operations and maintenance expense for NRG Business related to the timing of maintenance and outages	16
Increase in property taxes in part due to a tax settlement in the prior year for Bowline	11
Increase in operating costs for NRG Home Retail related to the acquisition of Dominion in 2014	9
Increase in operations and maintenance expense related to Ivanpah reaching commercial operations in early 2014	7
Increase in operations and maintenance expense related to El Segundo Energy Center related to the forced outage in the first quarter of 2015	5
Other	2
	$	170

Depreciation and Amortization

Depreciation and amortization increased by $60 million for the three months ended March 31, 2015, compared to the same period in 2014, due primarily to depreciation expense of $37 million from the acquisition of EME and $16 million from the acquisition of Alta Wind.

Selling, General and Administrative Expenses

Selling, general and administrative expenses is comprised of the following:

	Three months ended March 31,
(In millions)	2015		2014
General and administrative expenses	$	155	$	152
Selling and marketing expenses	108		70
	$	263	$	222

General and administrative expenses increased by $3 million for the three months ended March 31, 2015, compared to the same period in 2014. Selling and marketing expenses increased by $38 million compared to the prior year primarily due to the acquisitions of RDS and Pure Energies, which provided NRG Home Solar with an installation team, internet and telephonic sales team and certain sales channels.

Equity in Earnings of Unconsolidated Affiliates

NRG's equity in earnings of unconsolidated affiliates decreased by $10 million for the three months ended March 31, 2015, as compared to the same period in 2014, due primarily to a change in the value of gas swaps at certain equity method investments and losses incurred by the Company's interest in Petra Nova Parish Holdings LLC.

62

Interest Expense

NRG's interest expense increased by $46 million for the three months ended March 31, 2015, compared to the same period in 2014 due to the following:

Increase in interest expense	(In millions)
Increase due to the acquisition of EME in April 2014 and Alta Wind in August 2014	$	37
Increase for the 2022 Senior Notes issued in January 2014 and 2024 Senior Notes issued in April 2014	21
Increase due to issuance of NRG Yield Operating LLC 2024 Senior Notes issued in 2014	8
Decrease due to the redemption of 7.625% and 8.5% Senior Notes due 2019	(23		)
Other	3
	$	46

Income Tax Benefit

For the three months ended March 31, 2015, NRG recorded an income tax benefit of $73 million on a pre-tax loss of $209 million. For the same period in 2014, NRG recorded an income tax benefit of $31 million on a pre-tax loss of $98 million. The effective tax rate was 34.9% and 31.6% for the three months ended March 31, 2015, and 2014, respectively.

For the three months ended March 31, 2015, NRG's overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of production tax credits generated from our wind assets partially offset by non-taxable equity earnings and tax expense attributable to consolidated partnerships.

For the three months ended March 31, 2014, NRG's overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of non-taxable equity earnings, production tax credits and the impact of state and local income taxes.

Net loss attributable to noncontrolling interests and redeemable noncontrolling interests

For the three months ended March 31, 2015, and 2014, net loss attributable to noncontrolling interests primarily reflects NRG Yield, Inc.'s share of net income for the period after the initial public offering, offset by losses attributable to the noncontrolling partners for Ivanpah.

63

Liquidity and Capital Resources

Liquidity Position

As of March 31, 2015, and December 31, 2014, NRG's liquidity, excluding collateral received, was approximately $4.0 billion and $3.9 billion, respectively, comprised of the following:

(In millions)	March 31, 2015		December 31, 2014
Cash and cash equivalents	$	2,164	$	2,116
Restricted cash	443		457
Total	2,607		2,573
Total credit facility availability	1,424		1,367
Total liquidity, excluding collateral received	$	4,031	$	3,940

For the three months ended March 31, 2015, total liquidity, excluding collateral received, increased by $91 million. Changes in cash and cash equivalent balances are further discussed hereinafter under the heading CashFlow Discussion. Cash and cash equivalents at March 31, 2015, were predominantly held in money market mutual funds and bank deposits.

Management believes that the Company's liquidity position and cash flows from operations will be adequate to finance operating and maintenance capital expenditures, to fund dividends to NRG's common and preferred stockholders, and other liquidity commitments. Management continues to regularly monitor the Company's ability to finance the needs of its operating, financing and investing activity within the dictates of prudent balance sheet management.

Restricted Payments Tests

Of the $2.2 billion of cash and cash equivalents of the Company as of March 31, 2015, $275 million and $334 million were held by GenOn Mid-Atlantic and REMA, respectively. The ability of certain of GenOn’s and GenOn Americas Generation’s subsidiaries to pay dividends and make distributions is restricted under the terms of certain agreements, including the GenOn Mid-Atlantic and REMA operating leases.  Under their respective operating leases, GenOn Mid-Atlantic and REMA are not permitted to make any distributions and other restricted payments unless:  (a) they satisfy the fixed charge coverage ratio for the most recently ended period of four fiscal quarters; (b) they are projected to satisfy the fixed charge coverage ratio for each of the two following periods of four fiscal quarters, commencing with the fiscal quarter in which such payment is proposed to be made; and (c) no significant lease default or event of default has occurred and is continuing.  In addition, prior to making a dividend or other restricted payment, REMA must be in compliance with the requirement to provide credit support to the owner lessors securing its obligation to pay scheduled rent under its leases. Based on GenOn Mid-Atlantic’s and REMA’s most recent calculations of these tests, GenOn Mid-Atlantic and REMA did not satisfy the restricted payments tests. As a result, as of March 31, 2015, GenOn Mid-Atlantic and REMA could not make distributions of cash and certain other restricted payments. Each of GenOn Mid-Atlantic and REMA may recalculate its fixed charge coverage ratios from time to time and, subject to compliance with the restricted payments test described above, make dividends or other restricted payments.

To the extent GenOn Mid-Atlantic or REMA are able to pay dividends to GenOn, the GenOn Senior Notes due 2018 and 2020 and the related indentures restrict the ability of GenOn to incur additional liens and make certain restricted payments, including dividends. In the event of a default or if restricted payment tests are not satisfied, GenOn would not be able to distribute cash to its parent, NRG. At March 31, 2015, GenOn met the consolidated debt ratio component of the restricted payments test.

64

Sources of Liquidity

The principal sources of liquidity for NRG's future operating and capital expenditures are expected to be derived from new and existing financing arrangements, existing cash on hand and cash flows from operations. As described in Note 7, Debt and Capital Leases, to this Form 10-Q and Note 12, Debt and Capital Leases, to the Company's 2014 Form 10-K, the Company's financing arrangements consist mainly of the Senior Credit Facility, the Senior Notes, the GenOn Senior Notes, the GenOn Americas Generation Senior Notes, and project-related financings.

Cash Proceeds from Sale of Assets to NRG Yield, Inc.

On January 2, 2015, the Company sold the following facilities to NRG Yield, Inc.: (i) Walnut Creek, a 485 MW natural gas facility located in City of Industry, California; (ii) the Tapestry projects, which include Buffalo Bear, a 19 MW wind facility in Buffalo, Oklahoma; Pinnacle, a 55 MW wind facility in Keyser, West Virgina; and Taloga, a 130 MW wind facility in Putnum, Oklahoma; and (iii) Laredo Ridge, an 80 MW wind facility located in Petersburg, Nebraska. NRG Yield, Inc. paid total cash consideration of $489 million, including $9 million of working capital adjustments, plus assumed project level debt of $737 million. The sale was recorded as a transfer of entities under common control and the related assets were transferred at carrying value. NRG Yield, Inc. utilized cash on hand and borrowings under its revolving credit facility of $210 million to fund the acquisition. Subsequently, $15 million of the balance outstanding under its revolving credit facility was repaid.

First Lien Structure

NRG has granted first liens to certain counterparties on a substantial portion of the Company's assets, excluding GenOn, Midwest Generation, NRG Yield, Inc. and NRG's assets that have project-level financing. NRG uses the first lien structure to reduce the amount of cash collateral and letters of credit that it would otherwise be required to post from time to time to support its obligations under out-of-the-money hedge agreements for forward sales of power or gas used as a proxy for power. To the extent that the underlying hedge positions for a counterparty are out-of-the-money to NRG, the counterparty would have claim under the lien program. The lien program limits the volume that can be hedged, not the value of underlying out-of-the-money positions. The first lien program does not require NRG to post collateral above any threshold amount of exposure. Within the first lien structure, the Company can hedge up to 80% of its coal and nuclear capacity, excluding GenOn and Midwest Generation's coal capacity, and 10% of its other assets, excluding GenOn's and Midwest Generation's other assets and NRG Yield, Inc.'s assets, with these counterparties for the first 60 months and then declining thereafter. Net exposure to a counterparty on all trades must be positively correlated to the price of the relevant commodity for the first lien to be available to that counterparty. The first lien structure is not subject to unwind or termination upon a ratings downgrade of a counterparty and has no stated maturity date.

The Company's lien counterparties may have a claim on its assets to the extent market prices exceed the hedged prices. As of March 31, 2015, all hedges under the first liens were in-the-money on a counterparty aggregate basis.

The following table summarizes the amount of MWs hedged against the Company's coal and nuclear assets and as a percentage relative to the Company's coal and nuclear capacity under the first lien structure as of March 31, 2015:

Equivalent Net Sales Secured by First Lien Structure (a)	2015		2016		2017		2018		2019
In MW	693		2,873		874		176		—
As a percentage of total net coal and nuclear capacity (b)	12	%	50	%	15	%	3	%	—	%

(a) Equivalent net sales include natural gas swaps converted using a weighted average heat rate by region.

(b) Net coal and nuclear capacity represents 80% of the Company’s total coal and nuclear assets eligible under the first lien which excludes coal assets acquired in the GenOn and EME (Midwest Generation) acquisitions, assets in NRG Yield, Inc. and NRG's assets that have project level financing.

Uses of Liquidity

The Company's requirements for liquidity and capital resources, other than for operating its facilities, can generally be categorized by the following: (i) commercial operations activities; (ii) debt service obligations; (iii) capital expenditures, including repowering and renewable development, and environmental; and (iv) allocations in connection with the Capital Allocation Program including acquisition opportunities, debt repayments, return of capital and dividend payments to stockholders.

The Company may offer certain assets to NRG Yield, Inc. pursuant to the Right of First Offer Agreement. Should NRG Yield, Inc. purchase the assets offered, the Company intends to allocate cash in an amount approximately equal to the proceeds received from the sale of assets to NRG Yield, Inc. equally among common share repurchases, corporate debt reduction and investment in contracted assets that could be considered for future sale to NRG Yield, Inc.

65

Commercial Operations

NRG's commercial operations activities require a significant amount of liquidity and capital resources. These liquidity requirements are primarily driven by: (i) margin and collateral posted with counterparties; (ii) margin and collateral required to participate in physical markets and commodity exchanges; (iii) timing of disbursements and receipts (i.e. buying fuel before receiving energy revenues); (iv) initial collateral for large structured transactions; and (v) collateral for project development. As of March 31, 2015, commercial operations had total cash collateral outstanding of $400 million, and $713 million outstanding in letters of credit to third parties primarily to support its commercial activities for both wholesale and retail transactions. As of March 31, 2015, total collateral held from counterparties was $39 million in cash and $48 million of letters of credit.

Future liquidity requirements may change based on the Company's hedging activities and structures, fuel purchases, and future market conditions, including forward prices for energy and fuel and market volatility. In addition, liquidity requirements are dependent on NRG's credit ratings and general perception of its creditworthiness.

Cash Grants

As of March 31, 2015, the Company had a net renewable energy grant receivable of $68 million, including $54 million for Ivanpah, net of sequestration. NRG believes it has complied with all material obligations under the 1603 Cash Grant Program and is actively pursuing indemnification and is working with the U.S. Treasury Department to obtain payment on the remaining 1603 applications the Company or its subsidiaries have submitted. 

Indemnity Receivable

The Company has a receivable of $75 million pursuant to an indemnity agreement the Company has with SunPower Corporation, Systems, or SunPower, relating to the CVSR project.  Pursuant to the purchase and sale agreement for the CVSR project between NRG and SunPower, SunPower agreed to indemnify NRG up to $75 million if Treasury made certain determinations and awarded a reduced 1603 cash grant for the project.  SunPower has refused to honor its contractual indemnification obligation.  As a result, on March 19, 2014, NRG filed a lawsuit against SunPower in California state court, alleging breach of contract and also seeking a declaratory judgment that SunPower has breached its indemnification obligation.  NRG is seeking $75 million in damages from SunPower. On April 2, 2015, SunPower filed its answer to the lawsuit and also a cross-complaint alleging that NRG owes SunPower $7.5 million as a result of SunPower having paid more than its required share to cover the repayment of the DOE cash grant bridge loans.

66

Capital Expenditures

The following tables and descriptions summarize the Company's capital expenditures for maintenance, environmental, and growth investments for the three months ended March 31, 2015, and the currently estimated capital expenditure and growth investments forecast for the remainder of 2015. 

	Maintenance			Environmental			Growth Investments			Total
	(In millions)
NRG Business
Gulf Coast	$	55		$	22		$	5		$	82
East	27			52			7			86
West	1			—			—			1
B2B	1			—			—			1
NRG Home Retail	6			—			—			6
NRG Home Solar	—			—			32			32
NRG Renew	—			—			30			30
NRG Yield	3			—			—			3
Corporate	6			—			5			11
Total cash capital expenditures for the three months ended March 31, 2015	99			74			79			252
Other investments (a)	—			—			55			55
Funding from debt financing, net of fees	—			(25		)	(3		)	(28		)
Funding from third party equity partners	(11		)	—			(10		)	(21		)
Total capital expenditures and investments, net of financings	88			49			121			258
Estimated capital expenditures for the remainder of 2015	421			283			1,190			1,894
Other investments (a)	—			—			40			40
Funding from debt financing, net of fees	—			(12		)	(139		)	(151		)
Funding from third party equity partners and cash grants	(14		)	—			(362		)	(376		)
NRG estimated capital expenditures for the remainder of 2015, net of financings	$	407		$	271		$	729		$	1,407

(a) Other investments includes restricted cash activity.

• Environmental capital expenditures — For the three months ended March 31, 2015, the Company's environmental capital expenditures included SO₂ and particulate controls at the Powerton and Waukegan facilities, controls to satisfy MATS and NSR settlement at the Big Cajun II facility and NO_x controls for the Sayreville and Gilbert facilities.

• Growth Investments capital expenditures — For the three months ended March 31, 2015, the Company's growth investment expenditures included $62 million for solar projects, $7 million for fuel conversions, $5 million for repowering projects and $5 million for the Company's other growth projects.

Environmental Capital Expenditures

Based on current (and in some cases proposed) rules, technology and preliminary plans based on some proposed rules, NRG estimates that environmental capital expenditures from 2015 through 2019 required to comply with environmental laws will be approximately $614 million which includes $57 million for GenOn and $440 million for plants acquired in the EME acquisition.

In connection with the acquisition of EME, as further described in Note 3, Business Acquisitions and Dispositions, of this Form 10-Q, NRG has committed to fund up to $350 million in capital expenditures for plant modifications at Powerton and Joliet to comply with environmental regulations.

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2015 Capital Allocation Program

Dividends

The following table lists the dividends paid during the three months ended March 31, 2015:

	First Quarter 2015
Dividends per Common Share	$	0.145

On April 20, 2015, NRG declared a quarterly dividend on the Company's common stock of $0.145 per share, payable May 15, 2015, to stockholders of record as of May 1, 2015, representing $0.58 on an annualized basis.

The Company's common stock dividends are subject to available capital, market conditions, and compliance with associated laws, regulations and other contractual obligations. The Company expects that, based on current circumstances, comparable cash dividends will continue to be paid in the foreseeable future.

Share Repurchases

In December 2014, the Company was authorized to repurchase $100 million of its common stock under the 2015 Capital Allocation Program. In March 2015, the Company was authorized to repurchase an additional $100 million of its common stock under the 2015 Capital Allocation Program. The purchase of common stock was made using cash on hand. As of December 31, 2014, the Company had purchased 1,624,360 shares of NRG common stock for approximately $44 million at an average cost of $26.95 per share. In the first quarter of 2015, the Company purchased an additional 3,146,484 shares of NRG common stock for approximately $79 million at an average cost of $25.15 per share. In April 2015, the Company purchased an additional 1,328,329 shares of NRG common stock for approximately $33 million at an average cost of $24.47 per share. Approximately $44 million is remaining under the initial authorizations. In addition, in the second quarter of 2015, the Company's board of directors authorized the repurchase of an additional $81 million of the Company's common stock.

Fuel Repowerings and Conversions

The table below lists the currently projected repowering and conversion projects at certain NRG Business facilities:

Facility	Net Generation Capacity (MW)	Project Type	Fuel Type	Targeted COD
Fuel Conversions - Regulatory Compliance(a)
Big Cajun Unit 2	575	Natural Gas Conversion	Natural Gas	Spring 2015
Joliet Units 6, 7 and 8	1,326	Natural Gas Conversion	Natural Gas	Summer 2016
Total	1,901
Repowering and Fuel Conversions - Growth Investments(b)
Avon Lake Units 7 and 9	732	Natural Gas Conversion	Natural Gas	Fall 2016
Dunkirk Units 2, 3 and 4	445	Natural Gas Conversion	Natural Gas	Spring 2016
Encina Units 1, 2, 3, 4, 5 and GT(c)	633	Repowering	Natural Gas	Fall 2017
Mandalay Units 1 and 2(c)	262	Repowering	Natural Gas	Spring 2020
New Castle Units 3, 4 and 5	325	Natural Gas Conversion	Natural Gas	Summer 2016
Portland Units 1 and 2	401	Ultra-Low Sulfur Diesel Conversion	Ultra-Low Sulfur Diesel	Summer 2016
P.H. Robinson Peakers 1-6	330	Repowering	Natural Gas	Spring 2016
Shawville Units 1, 2, 3 and 4	597	Natural Gas Conversion	Natural Gas	Summer 2016
Total	3,725
Total Fuel Repowerings and Conversions	5,626

(a) The Company plans to incur environmental capital expenditures associated with controls to satisfy MATS. These expenditures are included in the Company's environmental capital expenditures estimate noted above.

(b) Expenditures incurred for these projects are included in the Company's growth investments capital expenditures.

(c) Projects are subject to applicable regulatory approvals and permits.

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Cash Flow Discussion

The following table reflects the changes in cash flows for the comparative three month periods:

	Three months ended March 31,
	2015			2014		Change
	(In millions)
Net cash provided by operating activities	$	260		$	391	$	(131	)
Net cash used in/(provided by) investing activities	(270		)	124		(394		)
Net cash provided by financing activities	40			416		(376		)

Net Cash Provided By Operating Activities

Changes to net cash provided by operating activities were driven by:

	(In millions)
Decrease in operating income adjusted for non-cash items	$	(227	)
Change in cash collateral in support of risk management activities	194
Other changes in working capital	(98		)
	$	(131	)

Net Cash Used In Investing Activities

Changes to net cash used in investing activities were driven by:

	(In millions)
Decrease in cash grant receipts, primarily reflecting the prior year receipt of the CVSR cash grant	$	(385	)
Decrease in cash paid for acquisitions	217
Prior year receipt of cash for assets sold	(77		)
Prior year receipt of cash proceeds to fund cash grant bridge loan payment	(57		)
Increase in restricted cash	(45		)
Increase in capital expenditures related to maintenance and environmental projects	(15		)
Other	(32		)
	$	(394	)

Net Cash Provided By Financing Activities

Changes to net cash provided by financing activities were driven by:

	(In millions)
Net decrease in borrowings, offset by debt payments	$	(537	)
Increase in financing element of acquired derivatives	263
Increase in repurchases of treasury stock	(79		)
Decrease in cash contributions from noncontrolling interest	(34		)
Decrease in cash paid for deferred financing costs	23
Other	(12		)
	$	(376	)

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NOLs, Deferred Tax Assets and Uncertain Tax Position Implications, under ASC 740

For the three months ended March 31, 2015, the Company had a total domestic pre-tax book loss of $217 million and foreign pre-tax book income of $8 million. As of March 31, 2015, the Company has cumulative domestic NOL carryforwards of $4.3 billion and cumulative state NOL carryforwards of $3.3 billion for financial statement purposes. In addition, NRG has cumulative foreign NOL carryforwards of $200 million, of which $1 million will expire in 2015 of which $199 million do not have an expiration date.

In addition to these amounts, the Company has $73 million of tax effected uncertain tax benefits. As a result of the Company's tax position, and based on current forecasts, NRG anticipates income tax payments, primarily to state and local jurisdictions, of up to $50 million in 2015.

However, as the position remains uncertain for the $73 million of tax effected uncertain tax benefits, the Company has recorded a non-current tax liability of $55 million and may accrue the remaining balance as an increase to non-current liabilities until final resolution with the related taxing authority. The $55 million non-current tax liability for uncertain tax benefits is from positions taken on various state income tax returns, including accrued interest.

NRG is subject to examination by taxing authorities for income tax returns filed in the U.S. federal jurisdiction and various state and foreign jurisdictions including operations located in Australia. The Company is not subject to U.S. federal income tax examinations for years prior to 2011. With few exceptions, state and local income tax examinations are no longer open for years before 2009. The Company's primary foreign operations are also no longer subject to examination by local jurisdictions for years prior to 2010.

As of March 31, 2015, NRG has net deferred tax assets of $1.7 billion, which the Company believes is realizable primarily through the generation of future income before income taxes. In order to be able to consider future earnings in the assessment of the realizability of deferred tax assets, general accepted accounting principles indicate the Company should not have cumulative losses in the recent past. Should NRG determine it cannot utilize estimates of future earnings in its assessment, NRG could be required to establish a valuation allowance for up to the full amount of its deferred tax asset.

Off-Balance Sheet Arrangements

Obligations under Certain Guarantee Contracts

NRG and certain of its subsidiaries enter into guarantee arrangements in the normal course of business to facilitate commercial transactions with third parties. These arrangements include financial and performance guarantees, stand-by letters of credit, debt guarantees, surety bonds and indemnifications.

Retained or Contingent Interests

NRG does not have any material retained or contingent interests in assets transferred to an unconsolidated entity.

Derivative Instrument Obligations

The Company's 2.822% Preferred Stock includes a feature which is considered an embedded derivative in accordance with ASC 815. Although it is considered an embedded derivative, it is exempt from derivative accounting as it is excluded from the scope pursuant to ASC 815. As of March 31, 2015, based on the Company's stock price, the embedded derivative was out-of-the-money and had no redemption value.

Obligations Arising Out of a Variable Interest in an Unconsolidated Entity

Variable interest in equity investments — As of March 31, 2015, NRG has several investments with an ownership interest percentage of 50% or less in energy and energy-related entities that are accounted for under the equity method of accounting. Several of these investments are variable interest entities for which NRG is not the primary beneficiary. See also Note 8, Variable Interest Entities, or VIEs, to this Form 10-Q.

NRG's pro-rata share of non-recourse debt held by unconsolidated affiliates was approximately $335 million as of March 31, 2015. This indebtedness may restrict the ability of these subsidiaries to issue dividends or distributions to NRG. See also Note 16, Investments Accounted for by the Equity Method and Variable Interest Entities, to the Company's 2014 Form 10-K.

70

Contractual Obligations and Commercial Commitments

NRG has a variety of contractual obligations and other commercial commitments that represent prospective cash requirements in addition to the Company's capital expenditure programs, as disclosed in the Company's 2014 Form 10-K. See also Note 7, Debt and Capital Leases, and Note 13, Commitments and Contingencies, to this Form 10-Q for a discussion of new commitments and contingencies that also include contractual obligations and commercial commitments that occurred during the three months ended March 31, 2015.

71

Fair Value of Derivative Instruments

NRG may enter into power purchase and sales contracts, fuel purchase contracts and other energy-related financial instruments to mitigate variability in earnings due to fluctuations in spot market prices and to hedge fuel requirements at generation facilities or retail load obligations. In addition, in order to mitigate interest rate risk associated with the issuance of the Company's variable rate and fixed rate debt, NRG enters into interest rate swap agreements. The following disclosures about fair value of derivative instruments provide an update to, and should be read in conjunction with, Fair Value of Derivative Instruments in Item 7 — Management's Discussion and Analysis of Financial Condition and Results of Operations, of the Company's 2014 Form 10‑K.

The tables below disclose the activities that include both exchange and non-exchange traded contracts accounted for at fair value in accordance with ASC 820, Fair Value Measurements and Disclosures, or ASC 820. Specifically, these tables disaggregate realized and unrealized changes in fair value; disaggregate estimated fair values at March 31, 2015, based on their level within the fair value hierarchy defined in ASC 820; and indicate the maturities of contracts at March 31, 2015.

Derivative Activity Gains/(Losses)	(In millions)
Fair value of contracts as of December 31, 2014	$	413
Contracts realized or otherwise settled during the period	(154		)
Changes in fair value	(173		)
Fair Value of Contracts as of March 31, 2015	$	86

	Fair Value of Contracts as of March 31, 2015
	Maturity
Fair value hierarchy Gains/(Losses)	1 Year or Less		Greater than 1 Year to 3 Years			Greater than 3 Years to 5 Years			Greater than 5 Years			Total Fair Value
	(In millions)
Level 1	$	22	$	31		$	(19	)	$	—		$	34
Level 2	105		(17		)	(35		)	(35		)	18
Level 3	18		19			(1		)	(2		)	34
Total	$	145	$	33		$	(55	)	$	(37	)	$	86

The Company has elected to present derivative assets and liabilities on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. Also, collateral received or paid on the Company's derivative assets or liabilities are recorded on a separate line item on the balance sheet. Consequently, the magnitude of the changes in individual current and non-current derivative assets or liabilities is higher than the underlying credit and market risk of the Company's portfolio. As discussed in Item 3— Quantitative and Qualitative Disclosures About Market Risk, Commodity Price Risk, to this Form 10-Q, NRG measures the sensitivity of the Company's portfolio to potential changes in market prices using VaR, a statistical model which attempts to predict risk of loss based on market price and volatility. NRG's risk management policy places a limit on one-day holding period VaR, which limits the Company's net open position. As the Company's trade-by-trade derivative accounting results in a gross-up of the Company's derivative assets and liabilities, the net derivative asset and liability position is a better indicator of NRG's hedging activity. As of March 31, 2015, NRG's net derivative asset was $86 million, a decrease to total fair value of $327 million as compared to December 31, 2014. This decrease was driven by the roll-off of trades that settled during the period and losses in fair value.

Based on a sensitivity analysis using simplified assumptions, the impact of a $0.50 per MMBtu increase in natural gas prices across the term of the derivative contracts would result in a decrease of approximately $403 million in the net value of derivatives as of March 31, 2015. The impact of a $0.50 per MMBtu decrease in natural gas prices across the term of derivative contracts would result in an increase of approximately $361 million in the net value of derivatives as of March 31, 2015.

72

Critical Accounting Policies and Estimates

NRG's discussion and analysis of the financial condition and results of operations are based upon the consolidated financial statements, which have been prepared in accordance with U.S. GAAP. The preparation of these financial statements and related disclosures in compliance with U.S. GAAP requires the application of appropriate technical accounting rules and guidance as well as the use of estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent assets and liabilities. The application of these policies necessarily involves judgments regarding future events, including the likelihood of success of particular projects, legal and regulatory challenges, and the fair value of certain assets and liabilities. These judgments, in and of themselves, could materially affect the financial statements and disclosures based on varying assumptions, which may be appropriate to use. In addition, the financial and operating environment may also have a significant effect, not only on the operation of the business, but on the results reported through the application of accounting measures used in preparing the financial statements and related disclosures, even if the nature of the accounting policies has not changed.

On an ongoing basis, NRG evaluates these estimates, utilizing historic experience, consultation with experts and other methods the Company considers reasonable. In any event, actual results may differ substantially from the Company's estimates. Any effects on the Company's business, financial position or results of operations resulting from revisions to these estimates are recorded in the period in which the information that gives rise to the revision becomes known.

The Company identifies its most critical accounting policies as those that are the most pervasive and important to the portrayal of the Company's financial position and results of operations, and that require the most difficult, subjective and/or complex judgments by management regarding estimates about matters that are inherently uncertain. NRG's critical accounting policies include derivative instruments, income taxes and valuation allowance for deferred tax assets, impairment of long lived assets, goodwill and other intangible assets, and contingencies.

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ITEM 3 — QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

NRG is exposed to several market risks in the Company's normal business activities. Market risk is the potential loss that may result from market changes associated with the Company's merchant power generation or with an existing or forecasted financial or commodity transaction. The types of market risks the Company is exposed to are commodity price risk, interest rate risk, liquidity risk, credit risk and currency exchange risk. The following disclosures about market risk provide an update to, and should be read in conjunction with, Item 7A —Quantitative and Qualitative Disclosures About Market Risk, of the Company's 2014 Form 10-K.

Commodity Price Risk

Commodity price risks result from exposures to changes in spot prices, forward prices, volatilities and correlations between various commodities, such as natural gas, electricity, coal, oil and emissions credits. NRG manages the commodity price risk of the Company's merchant generation operations and load serving obligations by entering into various derivative or non-derivative instruments to hedge the variability in future cash flows from forecasted sales and purchases of electricity and fuel. NRG measures the risk of the Company's portfolio using several analytical methods, including sensitivity tests, scenario tests, stress tests, position reports and VaR. NRG uses a Monte Carlo simulation based VaR model to estimate the potential loss in the fair value of its energy assets and liabilities, which includes generation assets, load obligations and bilateral physical and financial transactions.

The following table summarizes average, maximum and minimum VaR for NRG's commodity portfolio, including generation assets, load obligations and bilateral physical and financial transactions, calculated using the VaR model for the three months ending March 31, 2015, and 2014:

(In millions)	2015		2014
VaR as of March 31,	$	47	$	78
Three months ended March 31,
Average	$	47	$	88
Maximum	54		142
Minimum	38		73

In order to provide additional information for comparative purposes to NRG's peers, the Company also uses VaR to estimate the potential loss of derivative financial instruments that are subject to mark-to-market accounting. These derivative instruments include transactions that were entered into for both asset management and trading purposes. The VaR for the derivative financial instruments calculated using the diversified VaR model as of March 31, 2015, for the entire term of these instruments entered into for both asset management and trading was $46 million, primarily driven by asset-backed transactions.

Interest Rate Risk

NRG is exposed to fluctuations in interest rates through its issuance of fixed rate and variable rate debt. Exposures to interest rate fluctuations may be mitigated by entering into derivative instruments known as interest rate swaps, caps, collars and put or call options. These contracts reduce exposure to interest rate volatility and result in primarily fixed rate debt obligations when taking into account the combination of the variable rate debt and the interest rate derivative instrument. NRG's risk management policies allow the Company to reduce interest rate exposure from variable rate debt obligations.

The Company's project subsidiaries enter into interest rate swaps, intended to hedge the risks associated with interest rates on non-recourse project level debt. See Note 12, Debt and Capital Leases, of the Company's 2014 Form 10-K, as well as Note 7, Debt and Capital Leasesof this Form 10-Q, for more information on the Company's interest rate swaps.

If all of the above swaps had been discontinued on March 31, 2015, the Company would have owed the counterparties $202 million. Based on the investment grade rating of the counterparties, NRG believes its exposure to credit risk due to nonperformance by counterparties to its hedge contracts to be insignificant.

NRG has both long and short-term debt instruments that subject the Company to the risk of loss associated with movements in market interest rates. As of March 31, 2015, a 1% change in variable interest rates would result in a $23 million change in interest expense on a rolling twelve month basis.

As of March 31, 2015, the fair value and related carrying value of the Company's debt was $20.7 billion. NRG estimates that a 1% decrease in market interest rates would have increased the fair value of the Company's long-term debt by $1.4 billion.

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Liquidity Risk

Liquidity risk arises from the general funding needs of NRG's activities and in the management of the Company's assets and liabilities. The Company is currently exposed to additional collateral posting if natural gas prices decline primarily due to the long natural gas equivalent position at various exchanges used to hedge NRG's retail supply load obligations.

Based on a sensitivity analysis for power and gas positions under marginable contracts, a $0.50 per MMBtu change in natural gas prices across the term of the marginable contracts would cause a change in margin collateral posted of approximately $302 million as of March 31, 2015, and a 1 MMBtu/MWh change in heat rates for heat rate positions would result in a change in margin collateral posted of approximately $193 million as of March 31, 2015. This analysis uses simplified assumptions and is calculated based on portfolio composition and margin-related contract provisions as of March 31, 2015.

Credit Risk

Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. NRG is exposed to counterparty credit risk through various activities including wholesale sales, fuel purchases and retail supply arrangements, and retail customer credit risk through its retail load activities. See Note 4, Fair Value of Financial Instruments, to this Form 10-Q for discussions regarding counterparty credit risk and retail customer credit risk, and Note 6, Accounting for Derivative Instruments and Hedging Activities, to this Form 10-Q for discussion regarding credit risk contingent features.

Currency Exchange Risk

NRG's foreign earnings and investments may be subject to foreign currency exchange risk, which NRG generally does not hedge. As these earnings and investments are not material to NRG's consolidated results, the Company's foreign currency exposure is limited.

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ITEM 4 — CONTROLS AND PROCEDURES

Conclusion Regarding the Effectiveness of Disclosure ControlsandProcedures

Under the supervision and with the participation of NRG's management, including its principal executive officer, principal financial officer and principal accounting officer, NRG conducted an evaluation of the effectiveness of the design and operation of its disclosure controls and procedures, as such term is defined in Rules 13a-15(e) or 15d-15(e) of the Exchange Act. Based on this evaluation, the Company's principal executive officer, principal financial officer and principal accounting officer concluded that the disclosure controls and procedures were effective as of the end of the period covered by this Quarterly Report on Form 10-Q.

Changes in Internal Control over Financial Reporting

There were no changes in NRG’s internal control over financial reporting (as such term is defined in Rule 13a-15(f) under the Exchange Act) that occurred in the first quarter of 2015 that materially affected, or are reasonably likely to materially affect, NRG’s internal control over financial reporting.

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PART II — OTHER INFORMATION

ITEM 1 — LEGAL PROCEEDINGS

For a discussion of material legal proceedings in which NRG was involved through March 31, 2015, see Note 13, Commitments and Contingencies, to this Form 10-Q.

ITEM 1A — RISK FACTORS

Information regarding risk factors appears in Part I, Item 1A, RiskFactors Related to NRG Energy, Inc., in the Company's 2014 Form 10-K. There have been no material changes in the Company's risk factors since those reported in its 2014 Form 10‑K.

ITEM 2 — UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

In December 2014, the Company's board of directors authorized the Company to repurchase $100 million of its common stock under the 2015 Capital Allocation Program. The authorization did not specify an expiration date. The Company completed the repurchase of the $100 million of its common stock in February 2015.  In March 2015, the Company's board of directors authorized the Company to repurchase an additional $100 million of its common stock under the 2015 Capital Allocation Program. The authorization did not specify an expiration date. In the second quarter of 2015, the Company's Board of Directors authorized the Company to repurchase an additional $81 million of its common stock.

The table below sets forth the information with respect to purchases made by or on behalf of NRG or any "affiliated purchaser" (as defined in Rule 10b-18(a)(3) under the Exchange Act), of NRG's common stock during the quarter ended March 31, 2015.

For the year ended December 31, 2014	Total Number of Shares Purchased	Average Price Paid per Share(a)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs(b)
Month #1
(January 1, 2015 to January 31, 2015)	1,755,976	$	25.19	1,755,976	$	11,945,519
Month #2
(February 1, 2015 to February 28, 2015)	468,854	$	25.46	468,854	$	—
Month #3
(March 1, 2015 to March 31, 2015)	921,654	$	24.92	921,654	$	77,022,130
Total	3,146,484	$	25.15	3,146,484

(a) The average price paid per share excludes commissions of $0.015 per share paid in connection with the share repurchases.

(b) Includes commissions of $0.015 per share paid in connection with the share repurchases.

ITEM 3 — DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4 — MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5 — OTHER INFORMATION

None.

77

ITEM 6 — EXHIBITS

Number	Description	Method of Filing
4.1	One Hundred-Fifteenth Supplemental Indenture, dated as of April 8, 2015, among NRG Energy, Inc., the guarantors named therein and Law Debenture Trust Company of New York.	Incorporated herein by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K filed on April 9, 2015.
4.2	Fifth Supplemental Indenture, dated as of April 8, 2015, among NRG Energy, Inc., the guarantors named therein and Law Debenture Trust Company of New York.	Incorporated herein by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K filed on April 9, 2015.
4.3	One Hundred-Sixteenth Supplemental Indenture, dated as of April 29, 2015, among NRG Energy, Inc., the guarantors named therein and Law Debenture Trust Company of New York.	Incorporated herein by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K filed on April 30, 2015.
4.4	Sixth Supplemental Indenture, dated as of April 29, 2015, among NRG Energy, Inc., the guarantors named therein and Law Debenture Trust Company of New York.	Incorporated herein by reference to Exhibit 4.2 to the Company's Current Report on Form 8-K filed on April 30, 2015.
10.1	Second Amended and Restated Annual Incentive Plan for Designated Corporate Officers.	Incorporated herein by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on May 7, 2015.
31.1	Rule 13a-14(a)/15d-14(a) certification of David Crane.	Filed herewith.
31.2	Rule 13a-14(a)/15d-14(a) certification of Kirkland B. Andrews.	Filed herewith.
31.3	Rule 13a-14(a)/15d-14(a) certification of David Callen.	Filed herewith.
32	Section 1350 Certification.	Filed herewith.
101 INS	XBRL Instance Document.	Filed herewith.
101 SCH	XBRL Taxonomy Extension Schema.	Filed herewith.
101 CAL	XBRL Taxonomy Extension Calculation Linkbase.	Filed herewith.
101 DEF	XBRL Taxonomy Extension Definition Linkbase.	Filed herewith.
101 LAB	XBRL Taxonomy Extension Label Linkbase.	Filed herewith.
101 PRE	XBRL Taxonomy Extension Presentation Linkbase.	Filed herewith.

78

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	NRG ENERGY, INC. (Registrant)
	/s/ DAVID CRANE
	David Crane
	Chief Executive Officer (Principal Executive Officer)
	/s/ KIRKLAND B. ANDREWS
	Kirkland B. Andrews
	Chief Financial Officer (Principal Financial Officer)
	/s/ DAVID CALLEN
	David Callen
Date: May 8, 2015	Chief Accounting Officer (Principal Accounting Officer)

79

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, David Crane, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NRG Energy, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ DAVID CRANE

David Crane

Chief Executive Officer

(Principal Executive Officer)

Date: May 8, 2015

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Kirkland B. Andrews, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NRG Energy, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

Date: May 8, 2015

EX-31.3

EXHIBIT 31.3

CERTIFICATION

I, David Callen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of NRG Energy, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer)

Date: May 8, 2015

EX-32

EXHIBIT 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of NRG Energy, Inc. on Form 10-Q for the quarter ended March 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Form 10-Q”), each of the undersigned officers of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to such officer's knowledge:

(1) The Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods expressed in the Form 10-Q.

Date: May 8, 2015

/s/ DAVID CRANE  

David Crane

Chief Executive Officer

(Principal Executive Officer)

/s/ KIRKLAND B. ANDREWS

Kirkland B. Andrews

Chief Financial Officer

(Principal Financial Officer)

/s/ DAVID CALLEN

David Callen

Chief Accounting Officer

(Principal Accounting Officer) 

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of this Form 10-Q or as a separate disclosure document.

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to NRG Energy, Inc. and will be retained by NRG Energy, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended	0 Months Ended
	Mar. 31, 2015 MW	Apr. 09, 2015 generatingunit MW	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Power Generation Capacity, Megawatts	51,000
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	$ 19		$ 19
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	14
Existing Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Number of Solar Leases in Portfolio		2,200
Power Generation Capacity, Megawatts		17
Remaining Lease Term		17 years
In-Development Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Power Generation Capacity, Megawatts		48
Remaining Lease Term		20 years
In-Development Portfolio of Leases Tranche 2 [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Power Generation Capacity, Megawatts		42
Remaining Lease Term		20 years
Minimum [Member] | In-Development Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Number of Solar Leases in Portfolio		6,000
Minimum [Member] | In-Development Portfolio of Leases Tranche 2 [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Number of Solar Leases in Portfolio		5,500
Maximum [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Equity Method Investments		150
Maximum [Member] | In-Development Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Number of Solar Leases in Portfolio		7,000
Maximum [Member] | In-Development Portfolio of Leases Tranche 2 [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Number of Solar Leases in Portfolio		6,500
NRG [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Economic Interest in Entity		5.00%
NRG Yield, Inc. [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Capital Contribution to Equity Method Investment		26
Economic Interest in Entity		95.00%
Scenario, Plan [Member] | NRG [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Economic Interest in Entity		95.00%
Scenario, Plan [Member] | NRG Yield, Inc. [Member] | NRG RPV Holdco [Member]
Noncontrolling Interest [Line Items]
Economic Interest in Entity		5.00%

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Accounting for Derivative Instruments and Hedging Activities (Details 2 - Offsetting Derivatives) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative Assets	$ 2,620	$ 2,905
Cash Collateral (Held)	(68)	(72)
Gross Amounts of Recognized Derivative Liabilities	(2,534)	(2,492)
Cash Collateral Posted	400	187
Gross Amounts of Recognized Assets / Liabilities	86	413
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0	0
Derivative, Collateral, Obligation to Return Cash Net Of Derivative, Collateral, Right to Reclaim Cash	(9)	(45)
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	77	368
Commodity contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative Assets	2,620	2,902
Derivative Instruments	(2,092)	(2,155)
Cash Collateral (Held)	(64)	(72)
Net Amount	464	675
Gross Amounts of Recognized Derivative Liabilities	(2,336)	(2,327)
Derivative Instruments	2,092	2,155
Cash Collateral Posted	55	27
Derivative Liability, Fair Value, Amount Offset Against Collateral	189	145
Gross Amounts of Recognized Assets / Liabilities	284	575
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0	0
Derivative, Collateral, Obligation to Return Cash Net Of Derivative, Collateral, Right to Reclaim Cash	(9)	(45)
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	275	530
Interest rate contracts
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative Assets		2
Derivative Instruments		(2)
Cash Collateral (Held)		0
Net Amount		0
Gross Amounts of Recognized Derivative Liabilities	198	(165)
Derivative Instruments	0	2
Cash Collateral Posted	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	(198)	163
Gross Amounts of Recognized Assets / Liabilities		(163)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset		0
Derivative, Collateral, Obligation to Return Cash Net Of Derivative, Collateral, Right to Reclaim Cash		0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral		(163)
Equity Contract [Member]
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid
Derivative Assets		1
Derivative Instruments		0
Cash Collateral (Held)		0
Net Amount		$ 1

XML

Fair Value of Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt, including current portion	$ 20,509		$ 20,366
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	86	[1]	91	[1]
Long-term debt, including current portion	20,509		20,366
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes receivable	86	[1]	91	[1]
Long-term debt, including current portion	$ 20,679		$ 20,361

[1] Includes the current portion of notes receivable which is recorded in prepayments and other current assets on the Company's consolidated balance sheets

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Condensed Consolidating Financial Information (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument
Long-term Debt	$ 20,509	$ 20,366
Recourse Debt
Debt Instrument
Long-term Debt	8,823	8,800
Senior Notes [Member] | Recourse Debt
Debt Instrument
Long-term Debt	$ 6,400

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Accounting for Derivative Instruments and Hedging Activities (Details 3 - AOCI) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative
Derivative, Net Liability Position, Collateral Required Contracts with Credit Rating Contingent Feature	$ 39
Derivative Asset, Fair Value, Gross Asset	2,620		2,905
Derivative Liability, Fair Value, Gross Liability	2,534		2,492
Effects of ASC 815 on NRG's Accumulated OCI Balance Attributable to Cash Flow Hedge Derivatives, net of tax
Accumulated OCI beginning balance	(68)	(23)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	(1)
Mark-to-market of cash flow hedge accounting contracts	(18)	(8)
Accumulated OCI ending balance, net of tax	(84)	(32)
Gains/(losses) expected to be realized from OCI during the next 12 months, net of tax	(14)	(14)
Accumulated OCI ending balance, tax	50	17
Gains/(losses) expected to be realized from OCI during the next 12 months, tax	7	7
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	0
Commodity contracts
Derivative
Derivative Asset, Fair Value, Gross Asset	2,620		2,902
Derivative Liability, Fair Value, Gross Liability	2,336		2,327
Effects of ASC 815 on NRG's Accumulated OCI Balance Attributable to Cash Flow Hedge Derivatives, net of tax
Accumulated OCI beginning balance	(1)	(1)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0
Mark-to-market of cash flow hedge accounting contracts	0	0
Accumulated OCI ending balance, net of tax	(1)	(1)
Gains/(losses) expected to be realized from OCI during the next 12 months, net of tax	(1)	(1)
Interest rate contracts
Derivative
Derivative Asset, Fair Value, Gross Asset			2
Derivative Liability, Fair Value, Gross Liability	(198)		165
Effects of ASC 815 on NRG's Accumulated OCI Balance Attributable to Cash Flow Hedge Derivatives, net of tax
Accumulated OCI beginning balance	(67)	(22)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2	(1)
Mark-to-market of cash flow hedge accounting contracts	(18)	(8)
Accumulated OCI ending balance, net of tax	(83)	(31)
Gains/(losses) expected to be realized from OCI during the next 12 months, net of tax	$ (13)	$ (13)

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 7 - EME 1) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015 MW	Mar. 31, 2014	Apr. 02, 2014 MW	Dec. 31, 2014
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts	51,000
Payments to Acquire Businesses, Net of Cash Acquired	$ 1	$ 218
Edison Mission Energy [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts			8,000
Business Combination, Consideration Transferred			3,500
Business Combination, Estimated Consideration Transferred, Estimated Liabilities Incurred			700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			1,249	1,249
Common Stock [Member] | Edison Mission Energy [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares			12,671,977
Through 2034 [Member]
Business Acquisition [Line Items]
Repayments of Long-term Capital Lease Obligations		405
EME [Member]
Business Acquisition [Line Items]
Environmental Capital Expenditures, Estimated Total		$ 350

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Reconciliation of NRG's basic and diluted earnings per share

The reconciliation of NRG's basic and diluted loss per share is shown in the following table:

	Three months ended March 31,
(In millions, except per share data)	2015			2014
Basic and diluted loss per share attributable to NRG Energy, Inc. common stockholders
Net loss attributable to NRG Energy, Inc.	$	(120	)	$	(56	)
Dividends for preferred shares	5			2
Loss available for common stockholders	$	(125	)	$	(58	)
Weighted average number of common shares outstanding - basic and diluted	336			324
Loss per weighted average common share — basic and diluted	$	(0.37	)	$	(0.18	)

Summary of NRG's outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company's diluted earnings per share

The following table summarizes NRG’s outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company’s diluted loss per share:

	Three months ended March 31,
(In millions of shares)	2015	2014
Equity compensation plans	7	8
Embedded derivative of 2.822% redeemable perpetual preferred stock(a)	16	16
Total	23	24

(a) As of March 31, 2014, the redeemable perpetual preferred stock had an interest rate of 3.625%.

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Condensed Consolidating Financial Information (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Cash Flows from Operating Activities
Net Loss	$ (136)		$ (67)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in (earnings)/losses of unconsolidated affiliates and consolidated subsidiaries	32		(2)
Depreciation and amortization	395		335
Provision for bad debts	15		21
Amortization of nuclear fuel	13		11
Amortization of financing costs and debt discount/premiums	(4)		(5)
Amortization of intangibles and out-of-market contracts	19		13
Amortization of unearned equity compensation	11		8
Changes in deferred income taxes and liability for uncertain tax benefits	(83)		(111)
Changes in nuclear decommissioning trust liability	(3)		5
Changes in derivative instruments	261		525
Changes in collateral deposits supporting energy risk management activities	(213)		(407)
Cash used by changes in other working capital	(33)		65
Net Cash (Used)/Provided by Operating Activities	260		391
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	0		0
Acquisitions of businesses, net of cash acquired	(1)		(218)
Capital expenditures	(252)		(237)
(Increase)/decrease in restricted cash, net	(11)		3
Increase in restricted cash - U.S. DOE projects	25		56
Decrease/(increase) in notes receivable	5		1
Investments in nuclear decommissioning trust fund securities	(193)		(188)
Proceeds from the sale of nuclear decommissioning trust fund securities	196		183
Proceeds from renewable energy grants and state rebates	2		387
Proceeds from sale of assets, net of cash disposed of	0		77
Cash proceeds to fund cash grant bridge loan payment	0		57
Other	(41)		3
Net Cash Provided/(Used) by Investing Activities	(270)		124
Cash Flows from Financing Activities
Proceeds from intercompany loans	0		0
Payment of dividends to common and preferred stockholders	(51)		(41)
Payment of intercompany dividends			(41)
Payment for treasury stock	(79)		0
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements	40		(223)
Contributions and sale proceeds from noncontrolling interest in subsidiaries	25		(9)
Proceeds from issuance of long-term debt	248		1,564
Proceeds from issuance of common stock	1		3
Payment of debt issuance costs	0		(23)
Payments for short and long-term debt	(94)		(873)
Net Cash (Used)/Provided by Financing Activities	40		416
Effect of exchange rate changes on cash and cash equivalents	18		2
Net Increase/(Decrease) in Cash and Cash Equivalents	48		933
Cash and Cash Equivalents at Beginning of Period	2,116		2,254
Cash and Cash Equivalents at End of Period	2,164		3,187
Guarantor Subsidiaries
Cash Flows from Operating Activities
Net Loss	83		168
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	204		198
Net Cash (Used)/Provided by Operating Activities	820		446
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	(737)		(405)
Acquisitions of businesses, net of cash acquired	0		0
Capital expenditures	(89)		(73)
(Increase)/decrease in restricted cash, net	0		0
Increase in restricted cash - U.S. DOE projects	0		(4)
Decrease/(increase) in notes receivable	0		0
Investments in nuclear decommissioning trust fund securities	(193)		(188)
Proceeds from the sale of nuclear decommissioning trust fund securities	196		183
Proceeds from renewable energy grants and state rebates	0		0
Proceeds from sale of assets, net of cash disposed of			0
Cash proceeds to fund cash grant bridge loan payment			0
Other	(2)		7
Net Cash Provided/(Used) by Investing Activities	(825)		(480)
Cash Flows from Financing Activities
Proceeds from intercompany loans	0		0
Payment of dividends to common and preferred stockholders	0
Payment of intercompany dividends			0
Payment for treasury stock	0
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements	0		0
Contributions and sale proceeds from noncontrolling interest in subsidiaries	0		0
Proceeds from issuance of long-term debt	0		0
Proceeds from issuance of common stock	0		0
Payment of debt issuance costs			0
Payments for short and long-term debt	0		0
Net Cash (Used)/Provided by Financing Activities	0		0
Effect of exchange rate changes on cash and cash equivalents	0		0
Net Increase/(Decrease) in Cash and Cash Equivalents	(5)		(34)
Cash and Cash Equivalents at Beginning of Period	18		56
Cash and Cash Equivalents at End of Period	13		22
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities
Net Loss	(75)		(13)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	186		134
Net Cash (Used)/Provided by Operating Activities	(430)		430
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	328		4
Acquisitions of businesses, net of cash acquired	(1)		(25)
Capital expenditures	(157)		(162)
(Increase)/decrease in restricted cash, net	(11)		3
Increase in restricted cash - U.S. DOE projects	24		60
Decrease/(increase) in notes receivable	5		1
Investments in nuclear decommissioning trust fund securities	0		0
Proceeds from the sale of nuclear decommissioning trust fund securities	0		0
Proceeds from renewable energy grants and state rebates	2		387
Proceeds from sale of assets, net of cash disposed of			0
Cash proceeds to fund cash grant bridge loan payment			57
Other	(2)		(4)
Net Cash Provided/(Used) by Investing Activities	188		321
Cash Flows from Financing Activities
Proceeds from intercompany loans	0		0
Payment of dividends to common and preferred stockholders	0
Payment of intercompany dividends			0
Payment for treasury stock	0
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements	40		(223)
Contributions and sale proceeds from noncontrolling interest in subsidiaries	25		(9)
Proceeds from issuance of long-term debt	221		464
Proceeds from issuance of common stock	0		0
Payment of debt issuance costs			(9)
Payments for short and long-term debt	(89)		(405)
Net Cash (Used)/Provided by Financing Activities	147		(164)
Effect of exchange rate changes on cash and cash equivalents	18		2
Net Increase/(Decrease) in Cash and Cash Equivalents	(77)		589
Cash and Cash Equivalents at Beginning of Period	1,455		870
Cash and Cash Equivalents at End of Period	1,378		1,459
NRG Energy, Inc.
Cash Flows from Operating Activities
Net Loss	(126)		(52)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	5		3
Net Cash (Used)/Provided by Operating Activities	(539)		(886)
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	409		401
Acquisitions of businesses, net of cash acquired	0		(193)
Capital expenditures	(6)		(2)
(Increase)/decrease in restricted cash, net	0		0
Increase in restricted cash - U.S. DOE projects	1		0
Decrease/(increase) in notes receivable	0		0
Investments in nuclear decommissioning trust fund securities	0		0
Proceeds from the sale of nuclear decommissioning trust fund securities	0		0
Proceeds from renewable energy grants and state rebates	0		0
Proceeds from sale of assets, net of cash disposed of			77
Cash proceeds to fund cash grant bridge loan payment			0
Other	(37)		0
Net Cash Provided/(Used) by Investing Activities	367		283
Cash Flows from Financing Activities
Proceeds from intercompany loans	409		401
Payment of dividends to common and preferred stockholders	(51)
Payment of intercompany dividends			(41)
Payment for treasury stock	(79)
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements	0		0
Contributions and sale proceeds from noncontrolling interest in subsidiaries	0		0
Proceeds from issuance of long-term debt	27		1,100
Proceeds from issuance of common stock	1		3
Payment of debt issuance costs			(14)
Payments for short and long-term debt	(5)		(468)
Net Cash (Used)/Provided by Financing Activities	302		981
Effect of exchange rate changes on cash and cash equivalents	0		0
Net Increase/(Decrease) in Cash and Cash Equivalents	130		378
Cash and Cash Equivalents at Beginning of Period	643		1,328
Cash and Cash Equivalents at End of Period	773		1,706
Eliminations
Cash Flows from Operating Activities
Net Loss	(18)	[1]	(170)	[2]
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	0	[1]	0	[2]
Net Cash (Used)/Provided by Operating Activities	409	[1]	401	[1]
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	0	[1]	0	[1]
Acquisitions of businesses, net of cash acquired	0	[1]	0	[1]
Capital expenditures	0	[1]	0	[1]
(Increase)/decrease in restricted cash, net	0	[1]	0	[1]
Increase in restricted cash - U.S. DOE projects	0	[1]	0	[1]
Decrease/(increase) in notes receivable	0	[1]	0	[1]
Investments in nuclear decommissioning trust fund securities	0	[1]	0	[1]
Proceeds from the sale of nuclear decommissioning trust fund securities	0	[1]	0	[1]
Proceeds from renewable energy grants and state rebates	0	[1]	0	[1]
Proceeds from sale of assets, net of cash disposed of			0	[1]
Cash proceeds to fund cash grant bridge loan payment			0	[1]
Other	0	[1]	0	[1]
Net Cash Provided/(Used) by Investing Activities	0	[1]	0	[1]
Cash Flows from Financing Activities
Proceeds from intercompany loans	(409)	[1]	(401)	[1]
Payment of dividends to common and preferred stockholders	0	[1]
Payment of intercompany dividends			0	[1]
Payment for treasury stock	0	[1]
Net (payments for)/receipts from settlement of acquired derivatives that include financing elements	0	[1]	0	[1]
Contributions and sale proceeds from noncontrolling interest in subsidiaries	0	[1]	0	[1]
Proceeds from issuance of long-term debt	0	[1]	0	[1]
Proceeds from issuance of common stock	0	[1]	0	[1]
Payment of debt issuance costs			0	[1]
Payments for short and long-term debt	0	[1]	0	[1]
Net Cash (Used)/Provided by Financing Activities	(409)	[1]	(401)	[1]
Effect of exchange rate changes on cash and cash equivalents	0	[1]	0	[1]
Net Increase/(Decrease) in Cash and Cash Equivalents	0	[1]	0	[1]
Cash and Cash Equivalents at Beginning of Period	0	[1]	0	[1]
Cash and Cash Equivalents at End of Period	$ 0	[1]	$ 0	[1]

[1] All significant intercompany transactions have been eliminated in consolidation.

[2] (a)All significant intercompany transactions have been eliminated in consolidation.

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Debt and Capital Leases (Details 1 - Debt Table) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014	Jan. 27, 2014
Debt and Capital Leases
Long-term Debt	$ 20,509		$ 20,366
Subtotal	20,515		20,374
Less current maturities	465		474
Total long-term debt and capital leases	20,050		19,900
Interest rate, variable basis	3 month LIBOR
Recourse Debt
Debt and Capital Leases
Long-term Debt	8,823		8,800
Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	11,686		11,566
Convertible Debt, Fair Value Disclosures	327		326
Senior notes, due 2018 | Recourse Debt
Debt and Capital Leases
Long-term Debt	1,130		1,130
Interest rate, stated rate	7.625%	[1]
Senior notes, due 2020 | Recourse Debt
Debt and Capital Leases
Long-term Debt	1,063		1,063
Interest rate, stated rate	8.25%	[1]
Senior notes, due 2021 | Recourse Debt
Debt and Capital Leases
Long-term Debt	1,128		1,128
Interest rate, stated rate	7.875%	[1]
Senior Notes Due In 2022 [Member] | Recourse Debt
Debt and Capital Leases
Long-term Debt	1,100		1,100
Interest rate, stated rate	6.25%	[1]		6.25%
Senior notes, due 2023 | Recourse Debt
Debt and Capital Leases
Long-term Debt	990		990
Interest rate, stated rate	6.625%	[1]
Senior Notes 2024 [Member] | Recourse Debt
Debt and Capital Leases
Long-term Debt	1,000		1,000
Interest rate, stated rate	6.25%	[1]
Term loan facility, due 2018 | Recourse Debt
Debt and Capital Leases
Long-term Debt	1,978		1,983
Indian River Power LLC, tax-exempt bonds, due 2040 | Recourse Debt
Debt and Capital Leases
Interest rate, stated rate	6.00%	[1]
Indian River Power LLC, tax-exempt bonds, due 2045 | Recourse Debt
Debt and Capital Leases
Interest rate, stated rate	5.375%	[1]
Tax-exempt Bonds [Member] | Recourse Debt
Debt and Capital Leases
Long-term Debt	434		406
Dunkirk Power LLC, tax-exempt bonds, due 2042 | Recourse Debt
Debt and Capital Leases
Interest rate, stated rate	5.875%	[1]
Fort Bend County, tax-exempt bonds, due 2038 and 2042 | Recourse Debt
Debt and Capital Leases
Interest rate, stated rate	4.125%	[1]
GenOn Senior Notes [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	2,121		2,133
GenOn Senior Notes Due in 2017 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	7.875%	[1]
GenOn senior notes, due 2018 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	9.50%	[1]
GenOn senior notes, due 2020 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	9.875%	[1]
GenOn Americas Generation Senior Notes [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	926		929
GenOn Americas Generation Senior Notes Due in 2021 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	8.50%	[1]
GenOn Americas Generation senior notes, due in 2031 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	9.125%	[1]
GenOn Other [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	60		60
Genon [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	3,107		3,122
5.375% Senior Notes due in 2024 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	500		500
Interest rate, stated rate	5.375%	[1]
Revolving Credit Facility [Member]
Debt and Capital Leases
Interest rate, variable basis	1 - month LIBOR
Revolving Credit Facility [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	195		0
NRG West Holdings LLC, term loan, due 2023
Debt and Capital Leases
Interest rate, variable basis	1 - month LIBOR
NRG West Holdings LLC, term loan, due 2023 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	484		506
GenOn Marsh Landing term loans, due 2017 and 2023
Debt and Capital Leases
Interest rate, variable basis	1 - month LIBOR
GenOn Marsh Landing term loans, due 2017 and 2023 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	457		464
Alta Wind I - V Lease financing arrangement [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	1,036		1,036
Alta Wind I [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	7.015%	[1]
Alta Wind II [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	5.696%	[1]
Alta Wind III [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	6.067%	[1]
Alta Wind IV [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	5.938%	[1]
Alta Wind V [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	6.071%	[1]
Alta Wind X [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	300		300
Alta Wind XI [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	191		191
NRG Solar Alpine LLC, due 2022 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	162		163
NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017, and 2025 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	119		121
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, range, minimum	7.12%	[1]
Interest rate, range, maximum	7.25%	[1]
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2025 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, stated rate	5.95%	[1]
NRG Yield - Other [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	487		489
NRG Yield, Inc. | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	4,937		4,787
Interest rate, stated rate	3.50%	[1]
Ivanpah Financing, due 2014 and 2038 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	1,179		1,187
Interest rate, range, minimum	2.285%	[1]
Interest rate, range, maximum	4.256%	[1]
Agua Caliente Solar LLC, due 2037 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	907		898
Interest rate, range, minimum	2.395%	[1]
Interest rate, range, maximum	3.633%	[1]
CVSR - High Plains Ranch II LLC, due 2037 | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	802		815
Interest rate, range, minimum	2.339%	[1]
Interest rate, range, maximum	3.775%	[1]
Walnut Creek Energy, LLC, due in 2023 [Member]
Debt and Capital Leases
Interest rate, variable basis	1 - month LIBOR
Walnut Creek Energy, LLC, due in 2023 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	384		391
Interest rate, variable basis	LIBOR	[1]
Tapestry Wind LLC due in 2021 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	188		192
Interest rate, variable basis	LIBOR	[1]
Laredo Ridge Wind, LLC, due in 2026 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	107		108
Interest rate, variable basis	LIBOR	[1]
Viento Funding II, Inc., due in 2023 [Member]
Debt and Capital Leases
Interest rate, variable basis	6 month LIBOR
Viento Funding II, Inc., due in 2023 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	196		196
Interest rate, variable basis	LIBOR	[1]
NRG Peaker Finance Co. LLC Bonds Due 2019 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	101		100
Interest rate, variable basis	LIBOR	[1]
Cedro Hill Wind LLC, due in 2025 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	108		111
Interest rate, variable basis	LIBOR	[1]
Other (Non-recourse debt) | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	349		350
NRG Energy [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt	3,642		3,657
Chalk Point capital lease, due 2015
Debt and Capital Leases
Chalk Point capital lease, due 2015	3		5
Interest rate, Chalk Point capital lease	8.19%	[1]
Other (Capital leases)
Debt and Capital Leases
Chalk Point capital lease, due 2015	$ 3		$ 3
London Interbank Offered Rate (LIBOR) [Member] | Term loan facility, due 2018 | Recourse Debt
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, basis spread on variable rate	2.00%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, basis spread on variable rate	2.25%	[1]
London Interbank Offered Rate (LIBOR) [Member] | NRG West Holdings LLC, term loan, due 2023 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, range, minimum	2.25%	[1]
Interest rate, range, maximum	2.875%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Marsh Landing Term Loan Due 2017 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, basis spread on variable rate	1.75%	[1]
London Interbank Offered Rate (LIBOR) [Member] | GenOn Marsh Landing term loan, due 2023 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, basis spread on variable rate	1.875%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Alta Wind X [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, basis spread on variable rate	2.00%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Alta Wind XI [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, basis spread on variable rate	2.00%	[1]
London Interbank Offered Rate (LIBOR) [Member] | NRG Solar Alpine LLC, due 2022 | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, variable basis	LIBOR	[1]
Interest rate, range, minimum	1.75%	[1]
Interest rate, range, maximum	0.00%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Walnut Creek Energy, LLC, due in 2023 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, basis spread on variable rate	1.625%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Tapestry Wind LLC due in 2021 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, basis spread on variable rate	1.625%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Laredo Ridge Wind, LLC, due in 2026 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, basis spread on variable rate	1.875%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Viento Funding II, Inc., due in 2023 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, basis spread on variable rate	2.75%	[1]
London Interbank Offered Rate (LIBOR) [Member] | NRG Peaker Finance Co. LLC Bonds Due 2019 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, basis spread on variable rate	1.07%	[1]
London Interbank Offered Rate (LIBOR) [Member] | Cedro Hill Wind LLC, due in 2025 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Interest rate, basis spread on variable rate	3.125%	[1]

[1] As of March 31, 2015, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan which is 6 month LIBOR plus x% and the NRG West Holdings LLC term loan, NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC Revolving Credit facility which are 1 month LIBOR plus x%.

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Condensed Consolidating Financial Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Operating Revenues
Total operating revenues	$ 3,826	[1]	$ 3,486	[2]
Operating Costs and Expenses
Cost of operations	3,062		2,737
Depreciation and amortization	395		335
Selling, general and administrative	263		222
Acquisition-related transaction and integration costs	10		12
Development activity expenses	34		19
Total operating costs and expenses	3,764		3,325
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	14
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			19
Gain (Loss) on Disposition of Property Plant Equipment	14		19
Gain on postretirement benefits curtailment and sale of assets	14		19
Operating Income (Loss)	76		180
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	0		0
Equity in (loss)/earnings of unconsolidated affiliates	(3)		7
Other income, net	19		11
Loss on debt extinguishment	0		(41)
Interest expense	(301)		(255)
Total other expense	(285)		(278)
Loss before income taxes	(209)		(98)
Income tax expense/(benefit)	(73)		(31)
Net Loss	(136)		(67)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	(16)		(11)
Net (Loss)/Income Attributable to NRG Energy, Inc.	(120)		(56)
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	(12)		(9)
Foreign currency translation adjustments, net	(11)		6
Available-for-sale securities, net	(1)		6
Defined benefit plan, net	7		2
Other comprehensive (loss)/income	(17)		5
Comprehensive Income/(Loss)	(153)		(62)
Comprehensive loss attributable to noncontrolling interest	(29)		(15)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	(124)		(47)
Dividends for preferred shares	(5)		(2)
Comprehensive (Loss)/Income Available for Common Stockholders	(129)		(49)
Guarantor Subsidiaries
Operating Revenues
Total operating revenues	2,563		2,279
Operating Costs and Expenses
Cost of operations	2,104		1,797
Depreciation and amortization	204		198
Selling, general and administrative	102		101
Acquisition-related transaction and integration costs	0		0
Development activity expenses	0		0
Total operating costs and expenses	2,410		2,096
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			0
Operating Income (Loss)	153		183
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	(13)		49
Equity in (loss)/earnings of unconsolidated affiliates	0		4
Other income, net	1		1
Loss on debt extinguishment	0		0
Interest expense	(4)		(6)
Total other expense	(16)		48
Loss before income taxes	137		231
Income tax expense/(benefit)	54		63
Net Loss	83		168
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	0		0
Net (Loss)/Income Attributable to NRG Energy, Inc.	83		168
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	(7)		6
Foreign currency translation adjustments, net	0		0
Available-for-sale securities, net	0		0
Defined benefit plan, net	3		(2)
Other comprehensive (loss)/income	(10)		8
Comprehensive Income/(Loss)	73		176
Comprehensive loss attributable to noncontrolling interest	0		0
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	73		176
Dividends for preferred shares	0		0
Comprehensive (Loss)/Income Available for Common Stockholders	73		176
Non-Guarantor Subsidiaries
Operating Revenues
Total operating revenues	1,303		1,251
Operating Costs and Expenses
Cost of operations	995		974
Depreciation and amortization	186		134
Selling, general and administrative	101		57
Acquisition-related transaction and integration costs	2		1
Development activity expenses	15		10
Total operating costs and expenses	1,299		1,176
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	14
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			19
Operating Income (Loss)	18		94
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	(8)		(6)
Equity in (loss)/earnings of unconsolidated affiliates	(4)		1
Other income, net	17		4
Loss on debt extinguishment	0		(9)
Interest expense	(158)		(107)
Total other expense	(153)		(117)
Loss before income taxes	(135)		(23)
Income tax expense/(benefit)	(60)		(10)
Net Loss	(75)		(13)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	(21)		(3)
Net (Loss)/Income Attributable to NRG Energy, Inc.	(54)		(10)
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	11		(6)
Foreign currency translation adjustments, net	(9)		6
Available-for-sale securities, net	(1)		0
Defined benefit plan, net	1		0
Other comprehensive (loss)/income	0		0
Comprehensive Income/(Loss)	(75)		(13)
Comprehensive loss attributable to noncontrolling interest	(34)		(5)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	(41)		(8)
Dividends for preferred shares	0		0
Comprehensive (Loss)/Income Available for Common Stockholders	(41)		(8)
NRG Energy, Inc.
Operating Revenues
Total operating revenues	0		0
Operating Costs and Expenses
Cost of operations	12		(4)
Depreciation and amortization	5		3
Selling, general and administrative	60		64
Acquisition-related transaction and integration costs	8		11
Development activity expenses	19		9
Total operating costs and expenses	104		83
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			0
Operating Income (Loss)	(104)		(83)
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	50		115
Equity in (loss)/earnings of unconsolidated affiliates	(1)		0
Other income, net	1		7
Loss on debt extinguishment	0		(32)
Interest expense	(139)		(143)
Total other expense	(89)		(53)
Loss before income taxes	(193)		(136)
Income tax expense/(benefit)	(67)		(84)
Net Loss	(126)		(52)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	(6)		4
Net (Loss)/Income Attributable to NRG Energy, Inc.	(120)		(56)
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	(16)		5
Foreign currency translation adjustments, net	(2)		0
Available-for-sale securities, net	0		4
Defined benefit plan, net	(11)		0
Other comprehensive (loss)/income	(7)		9
Comprehensive Income/(Loss)	(133)		(43)
Comprehensive loss attributable to noncontrolling interest	(6)		4
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	(127)		(47)
Dividends for preferred shares	(5)		(2)
Comprehensive (Loss)/Income Available for Common Stockholders	(132)		(49)
Eliminations
Operating Revenues
Total operating revenues	(40)	[3]	(44)	[4]
Operating Costs and Expenses
Cost of operations	(49)	[3]	(30)	[4]
Depreciation and amortization	0	[3]	0	[4]
Selling, general and administrative	0	[3]	0	[4]
Acquisition-related transaction and integration costs	0	[3]	0	[4]
Development activity expenses	0	[3]	0	[4]
Total operating costs and expenses	(49)	[3]	(30)	[4]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			0	[4]
Operating Income (Loss)	9	[3]	(14)	[4]
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	(29)	[3]	(158)	[4]
Equity in (loss)/earnings of unconsolidated affiliates	2	[3]	2	[4]
Other income, net	0	[3]	(1)	[4]
Loss on debt extinguishment	0	[3]	0	[4]
Interest expense	0	[3]	1	[4]
Total other expense	(27)	[3]	(156)	[4]
Loss before income taxes	(18)	[3]	(170)	[4]
Income tax expense/(benefit)	0	[3]	0	[4]
Net Loss	(18)	[3]	(170)	[4]
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	11	[3]	(12)	[4]
Net (Loss)/Income Attributable to NRG Energy, Inc.	(29)	[3]	(158)	[4]
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	0	[4]	(14)	[3]
Foreign currency translation adjustments, net	0	[4]	0	[3]
Available-for-sale securities, net	0	[4]	2	[3]
Defined benefit plan, net	0	[4]	0	[3]
Other comprehensive (loss)/income	0	[4]	(12)	[3]
Comprehensive Income/(Loss)	(18)	[4]	(182)	[3]
Comprehensive loss attributable to noncontrolling interest	11	[4]	(14)	[3]
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	(29)	[4]	(168)	[3]
Dividends for preferred shares	0	[4]	0	[3]
Comprehensive (Loss)/Income Available for Common Stockholders	$ (29)	[4]	$ (168)	[3]

[1] (a) Operating revenues include inter-segment sales and net derivative gains and losses of:$246 $— $— $— $— $33 $— $279

[2] (b) Operating revenues include inter-segment sales and net derivative gains and losses of:$113 $2 $— $— $— $26 $— $141

[3] All significant intercompany transactions have been eliminated in consolidation.

[4] (a)All significant intercompany transactions have been eliminated in consolidation.

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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Schedule of Change in Noncontrolling Interest

Noncontrolling Interest

The following table reflects the changes in NRG's noncontrolling interest balance:

	(In millions)
Balance as of December 31, 2014	$	1,914
Sale of assets to NRG Yield, Inc.	(27		)
Distributions to noncontrolling interest	(24		)
Non-cash increase to noncontrolling interest	14
Comprehensive loss attributable to noncontrolling interest	(29		)
Balance as of March 31, 2015	$	1,848

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Fair Value of Financial Instruments (Details 3 - Level 3 FV) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014		Dec. 31, 2013
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes
No transfers during the three and six months ended June 30, 2013 and 2013 (Level 1 to Level 2)	$ 0		$ 0
No transfers during the three and six months ended June 30, 2013 and 2013 (Level 2 to Level 1)	0		0
Fair Value, Inputs, Level 3 [Member]
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	117		108		161		95
Total gains/(losses) - realized/unrealized:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(55)		17
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)			2
Included in nuclear decommissioning obligation	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	(4)		(21)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired			3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	15	[1]	18	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	(2)	[1]	(6)	[1]
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end	(20)		19
Fair Value, Inputs, Level 3 [Member] | Debt Securities
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	18		18		18		16
Total gains/(losses) - realized/unrealized:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)			2
Included in nuclear decommissioning obligation	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	[1]	0	[1]
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end	0		0
Fair Value, Inputs, Level 3 [Member] | Other Financial Instrument [Member]
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	11		11		11		10
Total gains/(losses) - realized/unrealized:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)			0
Included in nuclear decommissioning obligation	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	[1]	0	[1]
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end	0		0
Fair Value, Inputs, Level 3 [Member] | Trust Fund Investments
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	54		56		52		56
Total gains/(losses) - realized/unrealized:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)			0
Included in nuclear decommissioning obligation	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired			0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0	[1]	0	[1]
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end	0		0
Fair Value, Inputs, Level 3 [Member] | Derivative [Member]
Fair Value Asset and Liabilities, Measured on Recurring Basis Unobservable Input, Changes
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs	34	[2]	23	[2]	80	[2]	13	[2]
Total gains/(losses) - realized/unrealized:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(55)	[2]	16	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)			0	[2]
Included in nuclear decommissioning obligation	0	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	(4)	[2]	(21)	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Contracts Acquired			3	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	15	[1],[2]	18	[1],[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	(2)	[1],[2]	(6)	[1],[2]
Gains/(losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of period end	$ (20)	[2]	$ 19	[2]

[1] Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

[2] Consists of derivative assets and liabilities, net.

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 3 - Alta Wind) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended	0 Months Ended
	Aug. 13, 2014	Mar. 31, 2015	Jul. 30, 2014	Dec. 31, 2014	Aug. 12, 2014 MW	Aug. 05, 2014
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts		51,000
Long-term Debt		$ 20,509		$ 20,366
Alta Wind Portfolio [Member]
Business Acquisition [Line Items]
Percentage of Ownership					100.00%
Power Generation Capacity, Megawatts					947
Payments to Acquire Businesses, Gross	923
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt					870
Business Acquisition, Consideration Transferred, Working Capital					53
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		22		22
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				1,304
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				1,177
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				2,552
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt				1,591
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current and Non-Current Liabilities				38
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				1,629
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets				49
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets		(2)
Business Acquisition, Purchase Price Allocation, Other Assets, Adjusted		47
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		6
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment, Adjusted		1,310
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		(6)
Business Acquisition, Purchase Price Allocation, Intangible Assets, Other than Goodwill, Adjusted		1,171
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets		(2)
Business Acquisition, Purchase Price Allocation, Assets Acquired, Adjusted		2,550
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liabilities Longterm Debt		0
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt, Adjusted		1,591
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current and Noncurrent Liabilities		(2)
Business Acquisition, Purchase Price Allocation, Current and Non-current Liabilities, Adjusted		36
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities		(2)
Business Acquisition, Purchase Price Allocation, Liabilities Assumed, Adjusted		1,627
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				923
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets Acquired		0
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net Adjusted		923
NRG Yield Operating LLC [Member]
Business Acquisition [Line Items]
Long-term Debt						500
Debt Instrument, Interest Rate, Stated Percentage						5.375%
NRG Yield, Inc. | Common Class A [Member]
Business Acquisition [Line Items]
Shares, Issued			12,075,000
Proceeds from Issuance or Sale of Equity			$ 630

XML

Basis of Presentation Basis of Presentation (Details)	Mar. 31, 2015 MW
Basis of Presentation
Power Generation Capacity, Megawatts	51,000

XML

Nuclear Decommissioning Trust Fund (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Nuclear decommissioning trust fund disclosure
Fair Value	$ 586		$ 585
Unrealized Gains	218		218
Unrealized Losses	1		2
Realized gains	6	3
Available-for-sale Securities, Gross Realized Losses	2	1
Proceeds from Sale of Available-for-sale Securities	196	183
Cash and Cash Equivalents [Member]
Nuclear decommissioning trust fund disclosure
Fair Value	5		14
Unrealized Gains	0		0
Unrealized Losses	0		0
Weighted-average Maturities (In years)	0 years		0 years
U.S. government and federal agency obligations
Nuclear decommissioning trust fund disclosure
Fair Value	53		47
Unrealized Gains	3		2
Unrealized Losses	0		0
Weighted-average Maturities (In years)	10 years		11 years
Federal agency mortgage-backed securities
Nuclear decommissioning trust fund disclosure
Fair Value	71		74
Unrealized Gains	2		2
Unrealized Losses	0		0
Weighted-average Maturities (In years)	24 years		25 years
Commercial mortgage-backed securities
Nuclear decommissioning trust fund disclosure
Fair Value	24		25
Unrealized Gains	0		0
Unrealized Losses	1		1
Weighted-average Maturities (In years)	30 years		30 years
Corporate debt securities
Nuclear decommissioning trust fund disclosure
Fair Value	84		78
Unrealized Gains	2		2
Unrealized Losses	0		1
Weighted-average Maturities (In years)	10 years		11 years
Equity securities
Nuclear decommissioning trust fund disclosure
Fair Value	347		344
Unrealized Gains	211		211
Unrealized Losses	0		0
Weighted-average Maturities (In years)	0 years		0 years
Foreign government fixed income securities
Nuclear decommissioning trust fund disclosure
Fair Value	2		3
Unrealized Gains	0		1
Unrealized Losses	$ 0		$ 0
Weighted-average Maturities (In years)	15 years		16 years

XML

Commitments and Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended
	Jun. 30, 2013	Sep. 30, 2010
Notice of Intent to File Citizens Suit
Loss Contingencies
Civil Penalties	$ 100,000
Midwest Generation New Source Review [Member]
Loss Contingencies
Civil Penalties		$ 37,500

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Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015 MW	Dec. 31, 2014
Investments Accounted for by the Equity Method
Generation Capacity (in MW)	51,000
Equity investments in affiliates	$ 772	$ 771
Net assets less noncontrolling interests	25
GenConn Energy LLC
Investments Accounted for by the Equity Method
Economic interest in equity method investments (as a percent)	50.00%
Power generation units	2
Generation Capacity (in MW)	190
Equity investments in affiliates	112
Sherbino I Wind Farm LLC
Investments Accounted for by the Equity Method
Economic interest in equity method investments (as a percent)	50.00%
Equity investments in affiliates	81
Capistrano Wind [Member]
Investments Accounted for by the Equity Method
Generation Capacity (in MW)	411
Percentage of Ownership	100.00%
Power Generation Plants, Number	5
Cash Available for Distributions	100.00%
Current assets	28
Net property, plant and equipment	578
Other long-term assets	137
Total assets	743
Current liabilities	36
Long-term debt	180
Other long-term liabilities	154
Total liabilities	370
Noncontrolling interests	$ 348

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 8 - EME 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Apr. 02, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 2,520			$ 2,574
Acquisition-related transaction and integration costs	10	12
Edison Mission Energy [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			3,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	1,422			1,422
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				2,438
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment	(3)
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment, Adjusted	2,435
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	0
Business Acquisition, Purchase Price Allocation, Intangible Assets, Other than Goodwill, Adjusted	172
Goodwill				334
Goodwill, Purchase Accounting Adjustments	(56)
Goodwill, Adjusted	278
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets				773
Business Acquisition, Purchase Price Allocation, Other Assets, Adjusted	796
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				5,863
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets	13
Business Acquisition, Purchase Price Allocation, Assets Acquired, Adjusted	5,876
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current and Non-Current Liabilities				629
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Current and Noncurrent Liabilities	13
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Out-of-market Contracts and Leases				159
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Out of Market Contracts and Leases	0
Business Acquisition, Purchase Price Allocation, Out of Market Contracts and Leases, Adjusted	159
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			1,249	1,249
Business Acquisition, Purchase Price Allocation, Noncurrent Liabilities, Long-term Debt, Adjusted	1,249
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				2,037
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities	13
Business Acquisition, Purchase Price Allocation, Liabilities Assumed, Adjusted	2,050
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value				352
Business Acquisition, Purchase Price Allocation, Noncontrolling Interest, Adjusted	352
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets Acquired	0
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net Adjusted	3,474
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets				724
Business Combination, Provisional Information, Initial Accounting Incomplete, Current Assets	72
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				172
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Assets	0
Business Acquisition, Purchase Price Allocation, Noncurrent Assets, Adjusted	773
Business Acquisition, Purchase Price Allocation, Current and Non-current Liabilities, Adjusted	642
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncurrent Liabilities Longterm Debt	0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Noncontrolling Interest	0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest				$ 3,474

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Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Other Cash Flow Information

NRG’s investing activities exclude capital expenditures of $40 million which were accrued and unpaid at March 31, 2015.

Noncontrolling Interest

The following table reflects the changes in NRG's noncontrolling interest balance:

	(In millions)
Balance as of December 31, 2014	$	1,914
Sale of assets to NRG Yield, Inc.	(27		)
Distributions to noncontrolling interest	(24		)
Non-cash increase to noncontrolling interest	14
Comprehensive loss attributable to noncontrolling interest	(29		)
Balance as of March 31, 2015	$	1,848

NRG RPV Holdco 1 LLC

In April 2015, NRG and NRG Yield, Inc. announced the formation of a partnership that will invest in and hold operating portfolios of residential solar assets developed by NRG Home Solar, including: (i) an existing, unlevered portfolio of over 2,200 leases across nine states representing approximately 17 MW with a weighted average remaining lease term of approximately 17 years which NRG Yield, Inc. invested $26 million in April 2015; (ii) an in-development, tax equity financed portfolio of between 6,000 to 7,000 leases across at least 10 states representing approximately 48 MW with a lease term of 20 years; and (iii) an in-development tax equity financed portfolio of 5,500 to 6,500 leases representing approximately 42 MW with a lease term of 20 years. As part of the agreement, NRG will periodically monetize its residential leases through equity investments by NRG Yield, Inc. in NRG RPV Holdco 1 LLC. NRG will retain a 5% residual economic interest in the portfolio and act as managing member of the partnership. Allocations of income and cash will be 5% to NRG and 95% to NRG Yield, Inc. over the contracted life of the investments. Once NRG Yield, Inc. reaches its expected return on its investment, which is expected to be achieved consistent with the expiry of the remaining lease term, allocations of income and cash thereafter will be 95% to NRG and 5% to NRG Yield, Inc. NRG also has an option to purchase NRG Yield, Inc.'s interest at fair value after the flip date occurs. NRG Yield, Inc. has committed to invest up to an additional $150 million of cash contributions into the partnership over time, excluding the $26 million noted above.

Redeemable Noncontrolling Interest in Subsidiaries

Redeemable noncontrolling interest in subsidiaries represents third-party interests in the net assets under certain arrangements that the Company has entered into to finance the cost of solar energy systems under operating leases and wind facilities eligible for certain tax credits.  To the extent that the third-party has the right to redeem their interests for cash or other assets, the Company has included the noncontrolling interest attributable to the third party as a component of temporary equity in the mezzanine section of the consolidated balance sheet. During the three months ended March 31, 2015, changes in redeemable noncontrolling interest were immaterial and resulted from contributions from and allocated losses attributable to redeemable noncontrolling interests. As of March 31, 2015 and December 31, 2014, the Company's redeemable noncontrolling interest balance was $19 million.

Gain on Postretirement Benefits Curtailment

During the first quarter of 2015, the Company recognized a gain of $14 million related to the curtailment of certain of the Company's postretirement plans.

Recent Accounting Developments

ASU 2015-03 — In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, or ASU No. 2015-03. The amendments of ASU No. 2015-03 were issued to reduce complexity in the balance sheet presentation of debt issuance costs. ASU No. 2015-03 requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this standard. The guidance in ASU No. 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this standard is not expected to have a material impact on the Company's balance sheets on a gross basis and will have no impact on net assets.

ASU 2015-02 — In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, or ASU No. 2015-02. The amendments of ASU No. 2015-02 were issued in an effort to minimize situations under previously existing guidance in which a reporting entity was required to consolidate another legal entity in which that reporting entity did not have: (1) the ability through contractual rights to act primarily on its own behalf; (2) ownership of the majority of the legal entity's voting rights; or (3) the exposure to a majority of the legal entity's economic benefits. ASU No. 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The guidance in ASU No. 2015-02 is effective for periods beginning after December 15, 2015. Early adoption is permitted. The Company adopted the standard effective January 1, 2015 and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position.

ASU 2014-16 — In November 2014, the FASB issued ASU No. 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity, or ASU No. 2014-16. The amendments of ASU No. 2014-16 clarify how U.S. GAAP should be applied in determining whether the nature of a host contract is more akin to debt or equity and in evaluating whether the economic characteristics and risks of an embedded feature are "clearly and closely related" to its host contract. The guidance in ASU No. 2014-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company adopted the standard effective January 1, 2015 and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position.

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.

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Changes in Capital Structure (Details)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Common stock authorized (in shares)
Common stock, shares authorized	500,000,000	500,000,000
Shares issued, balance at the beginning of the year		415,506,176
Shares issued, balance at the end of the year	416,682,662	415,506,176
Treasury shares, balance at the beginning of the year		(78,843,552)
Treasury shares, balance at the beginning of the year	(81,865,411)	(78,843,552)
Shares outstanding, balance at the end of the year	334,817,251	336,662,624
Common Stock, Capital Shares Reserved for Employee Stock Purchase Plan	1,435,427
Long Term Incentive Plan [Member]
Common stock authorized (in shares)
Stock Issued During Period, Shares, New Issues	1,176,486
Treasury Stock, Shares, Acquired	0
Shares outstanding, balance at the end of the year	1,176,486
Employee Stock [Member]
Common stock authorized (in shares)
Stock Issued During Period, Shares, New Issues	0
Treasury Stock, Shares, Acquired	124,625
Shares outstanding, balance at the end of the year	124,625
Capital Allocation Plan [Member]
Common stock authorized (in shares)
Stock Issued During Period, Shares, New Issues	0
Treasury Stock, Shares, Acquired	(3,146,484)
Shares outstanding, balance at the end of the year	(3,146,484)

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 4 - Petra Nova) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Jul. 07, 2014	Mar. 31, 2015 MW	Dec. 31, 2014	Sep. 30, 2014	Jul. 03, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Power Generation Capacity, Megawatts		51,000
Long-term Debt		$ 20,509	$ 20,366
Petra Nova Parish Holdings [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of Ownership Sold of Subsidiary					50.00%
Capital Contribution to Equity Method Investment	35
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	76
Capital Contributions From Partners in Equity Method Investment				300
Petra Nova Parish Holdings [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Power Generation Capacity, Megawatts				75
Department of Energy [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount guaranteed to borrow by US DOE				167
JBIC and Mizuho [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term Debt				$ 250

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Accounting for Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional volume buy/(sell) of NRG's open derivative transactions broken out by commodity

The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception as of March 31, 2015, and December 31, 2014. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.

		Total Volume
		March 31, 2015			December 31, 2014
Category	Units	(In millions)
Emissions	Short Ton	4			2
Coal	Short Ton	48			57
Natural Gas	MMBtu	(35		)	(58		)
Oil	Barrel	1			1
Power	MWh	(52		)	(56		)
Capacity	MW/Day	(1		)	—
Interest	Dollars	$	3,399		$	3,440
Equity	Shares	2			2

Fair value within the derivative instrument valuation on the balance sheets

The following table summarizes the fair value within the derivative instrument valuation on the balance sheets:

	Fair Value
	Derivative Assets				Derivative Liabilities
	March 31, 2015		December 31, 2014		March 31, 2015		December 31, 2014
	(In millions)
Derivatives designated as cash flow hedges:
Interest rate contracts current	$	—	$	—	$	51	$	55
Interest rate contracts long-term	—		2		97		74
Commodity contracts current	—		—		—		—
Commodity contracts long-term	—		—		—		—
Total derivatives designated as cash flow hedges	—		2		148		129
Derivatives not designated as cash flow hedges:
Interest rate contracts current	—		—		9		8
Interest rate contracts long-term	—		—		41		28
Commodity contracts current	2,029		2,425		1,824		1,991
Commodity contracts long-term	591		477		512		336
Equity contracts long-term	—		1		—		—
Total derivatives not designated as cash flow hedges	2,620		2,903		2,386		2,363
Total derivatives	$	2,620	$	2,905	$	2,534	$	2,492

Offsetting of derivatives by counterparty master agreement level and collateral received or paid

The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:

	Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted			Net Amount
As of March 31, 2015	(In millions)
Commodity contracts:
Derivative assets	$	2,620		$	(2,092	)	$	(64	)	$	464
Derivative liabilities	(2,336		)	2,092			55			(189		)
Total commodity contracts	284			—			(9		)	275
Interest rate contracts:
Derivative liabilities	(198		)	—			—			(198		)
Total derivative instruments	$	86		$	—		$	(9	)	$	77

	Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted			Net Amount
As of December 31, 2014	(In millions)
Commodity contracts:
Derivative assets	$	2,902		$	(2,155	)	$	(72	)	$	675
Derivative liabilities	(2,327		)	2,155			27			(145		)
Total commodity contracts	575			—			(45		)	530
Interest rate contracts:
Derivative assets	2			(2		)	—			—
Derivative liabilities	(165		)	2			—			(163		)
Total interest rate contracts	(163		)	—			—			(163		)
Equity contracts:
Derivative assets	1			—			—			1
Total derivative instruments	$	413		$	—		$	(45	)	$	368

Effects of ASC 815 on the Company's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax

The following table summarizes the effects of ASC 815 on the Company's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax:

	Three months ended March 31, 2015
	Energy Commodities			Interest Rate			Total
	(In millions)
Accumulated OCI beginning balance	$	(1	)	$	(67	)	$	(68	)
Reclassified from accumulated OCI to income:
Due to realization of previously deferred amounts	—			2			2
Mark-to-market of cash flow hedge accounting contracts	—			(18		)	(18		)
Accumulated OCI ending balance, net of $50 tax	$	(1	)	$	(83	)	$	(84	)
Losses expected to be realized from OCI during the next 12 months, net of $7 tax	$	(1	)	$	(13	)	$	(14	)

	Three months ended March 31, 2014
	Energy Commodities			Interest Rate			Total
	(In millions)
Accumulated OCI beginning balance	$	(1	)	$	(22	)	$	(23	)
Reclassified from accumulated OCI to income:
Due to realization of previously deferred amounts	—			(1		)	(1		)
Mark-to-market of cash flow hedge accounting contracts	—			(8		)	(8		)
Accumulated OCI ending balance, net of $17 tax	$	(1	)	$	(31	)	$	(32	)
Losses expected to be realized from OCI during the next 12 months, net of $7 tax	$	(1	)	$	(13	)	$	(14	)

Pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations

The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense.

	Three months ended March 31,
	2015			2014
Unrealized mark-to-market results	(In millions)
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges	$	(114	)	$	3
Reversal of acquired gain positions related to economic hedges	(26		)	(78		)
Net unrealized losses on open positions related to economic hedges	(138		)	(193		)
Total unrealized mark-to-market losses for economic hedging activities	(278		)	(268		)
Reversal of previously recognized unrealized gains on settled positions related to trading activity	(21		)	—
Reversal of acquired gain positions related to trading activity	(7		)	(1		)
Net unrealized gains on open positions related to trading activity	6			16
Total unrealized mark-to-market (losses)/gains for trading activity	(22		)	15
Total unrealized losses	$	(300	)	$	(253	)

	Three months ended March 31,
	2015			2014
	(In millions)
Unrealized losses included in operating revenues	$	(109	)	$	(316	)
Unrealized (losses)/gains included in cost of operations	(191		)	63
Total impact to statement of operations — energy commodities	$	(300	)	$	(253	)
Total impact to statement of operations — interest rate contracts	$	(14	)	$	(4	)

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Nuclear Decommissioning Trust Fund (Tables)

3 Months Ended

Mar. 31, 2015

Nuclear Decommissioning Trust Fund Disclosure [Abstract]

Summary of aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held in the nuclear decommissioning trust fund

The following table summarizes the aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held in the trust funds, as well as information about the contractual maturities of those securities.

	As of March 31, 2015							As of December 31, 2014
(In millions, except otherwise noted)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)
Cash and cash equivalents	$	5	$	—	$	—	—	$	14	$	—	$	—	—
U.S. government and federal agency obligations	53		3		—		10	47		2		—		11
Federal agency mortgage-backed securities	71		2		—		24	74		2		—		25
Commercial mortgage-backed securities	24		—		1		30	25		—		1		30
Corporate debt securities	84		2		—		10	78		2		1		11
Equity securities	347		211		—		—	344		211		—		—
Foreign government fixed income securities	2		—		—		15	3		1		—		16
Total	$	586	$	218	$	1		$	585	$	218	$	2

Summary of proceeds from sales of available-for-sale securities and the related realized gains and losses

The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method.

	Three months ended March 31,
	2015		2014
	(In millions)
Realized gains	$	6	$	3
Realized losses	2		1
Proceeds from sale of securities	196		183

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Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities (Details 4 - mark to market) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Unrealized mark-to-market results
Reversal of previously recognized unrealized losses/(gains) on settled positions related to economic hedges	$ (114)	$ 3
Reversal of loss positions acquired as part of the acquisition	(26)	(78)
Net unrealized gains/(losses) on open positions related to economic hedges	138	193
Total unrealized mark-to-market gains/(losses) for economic hedging activities	(278)	(268)
Reversal of previously recognized unrealized (gains) losses on settled positions related to trading activity	(21)	0
Reversal of Previously Unrecognized Unrealized Gain Loss Acquired as Part of Acquisition Trading Activity	(7)	(1)
Net unrealized gains on open positions related to trading activity	6	16
Total unrealized mark-to-market gains for trading activity	(22)	15
Impact of derivative instruments on statement of operations
Total unrealized gains/(losses)	(300)	(253)
Credit Risk Related Contingent Features
Derivative Liability, Fair Value of Collateral	131
Derivative, Net Liability Position, Collateral Required Contracts with Credit Rating Contingent Feature	39
Collateral due on net liability position that has not been called by a certain marginable agreement counterparty	8
Commodity contracts
Impact of derivative instruments on statement of operations
Total unrealized gains/(losses)	(300)	(253)
Commodity contracts | Sales [Member]
Impact of derivative instruments on statement of operations
Total unrealized gains/(losses)	(109)	(316)
Commodity contracts | Cost of Sales [Member]
Impact of derivative instruments on statement of operations
Total unrealized gains/(losses)	(191)	63
Interest rate contracts
Impact of derivative instruments on statement of operations
Total unrealized gains/(losses)	$ (14)	$ (4)

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 5 - 2014 Sale to Yield) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jan. 02, 2015	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term Debt	$ 20,509	$ 20,366
ROFO Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration Paid for Sale of Assets Under Common Control			489	357
Long-term Debt			737	612
Assets Transferred, Carrying Value			405	236
Base Purchase Price [Member] | ROFO Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration Paid for Sale of Assets Under Common Control				349
Working Capital Adjustment [Member] | ROFO Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration Paid for Sale of Assets Under Common Control			$ 9	$ 8

XML

Debt and Capital Leases Debt and Capital Leases (Tables)

3 Months Ended

Mar. 31, 2015

Debt Instrument [Line Items]

Long-term debt and capital leases

Long-term debt and capital leases consisted of the following:

(In millions, except rates)	March 31, 2015		December 31, 2014		Current interest rate % (a)
Recourse debt:
Senior notes, due 2018	$	1,130	$	1,130	7.625
Senior notes, due 2020	1,063		1,063		8.250
Senior notes, due 2021	1,128		1,128		7.875
Senior notes, due 2022	1,100		1,100		6.250
Senior notes, due 2023	990		990		6.625
Senior notes, due 2024	1,000		1,000		6.250
Term loan facility, due 2018	1,978		1,983		L+2.00
Tax-exempt bonds	434		406		4.125 - 6.00
Subtotal NRG recourse debt	8,823		8,800
Non-recourse debt:
GenOn senior notes	2,121		2,133		7.875 - 9.875
GenOn Americas Generation senior notes	926		929		8.500 - 9.125
GenOn Other	60		60		various
Subtotal GenOn debt (non-recourse to NRG)	3,107		3,122
NRG Yield Operating LLC Senior Notes, due 2024	500		500		5.375
NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, due 2019	195		—		L+2.25
NRG Yield, Inc. Convertible Senior Notes, due 2019	327		326		3.500
NRG West Holdings LLC, due 2023 (El Segundo Energy Center)	484		506		L+2.25 - L+2.875
NRG Marsh Landing, due 2017 and 2023	457		464		L+1.75 - L+1.875
Alta Wind I - V lease financing arrangements, due 2034 and 2035	1,036		1,036		5.696-7.015
Alta Wind X, due 2021	300		300		L+2.00
Alta Wind XI, due 2021	191		191		L+2.00
Walnut Creek, term loans due 2023	384		391		L+1.625
Tapestry Wind LLC, due 2021	188		192		L+1.625
Laredo Ridge Wind LLC, due 2026	107		108		L+1.875
NRG Solar Alpine LLC, due 2022	162		163		L+1.750
NRG Energy Center Minneapolis LLC, due 2017 and 2025	119		121		5.95 - 7.25
NRG Yield - other	487		489		various
Subtotal NRG Yield debt (non-recourse to NRG)	4,937		4,787
Ivanpah Financing, due 2033 and 2038	1,179		1,187		2.285 - 4.256
Agua Caliente Solar LLC, due 2037	907		898		2.395 - 3.633
CVSR High Plains Ranch II LLC, due 2037	802		815		2.339 - 3.775
Viento Funding II, Inc., due 2023	196		196		L+2.75
NRG Peaker Finance Co. LLC, bonds due 2019	101		100		L+1.07
Cedro Hill Wind LLC, due 2025	108		111		L+3.125
NRG - other	349		350		various
Subtotal NRG non-recourse debt	3,642		3,657
Subtotal non-recourse debt (including GenOn and NRG Yield)	11,686		11,566
Subtotal long-term debt (including current maturities)	20,509		20,366
Capital leases:
Chalk Point capital lease, due 2015	3		5		8.190
Other	3		3		various
Subtotal long-term debt and capital leases (including current maturities)	20,515		20,374
Less current maturities	465		474
Total long-term debt and capital leases	$	20,050	$	19,900

(a) As of March 31, 2015, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan which is 6 month LIBOR plus x% and the NRG West Holdings LLC term loan, NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC Revolving Credit facility which are 1 month LIBOR plus x%.

XML

Variable Interest Entities Summarized Financial Information (Tables)

3 Months Ended

Mar. 31, 2015

Condensed Financial Statements

Additional Financial Information Disclosure [Text Block]

The summarized financial information for Capistrano Wind Holdings consisted of the following:

(In millions)	March 31, 2015
Current assets	$	28
Net property, plant and equipment	578
Other long-term assets	137
Total assets	743
Current liabilities	36
Long-term debt	180
Other long-term liabilities	154
Total liabilities	370
Noncontrolling interests	348
Net assets less noncontrolling interests	$	25

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]

Basis of Presentation

NRG Energy, Inc., or NRG or the Company, is a competitive power company, which produces, sells and delivers energy and energy products and services in major competitive power markets primarily in the U.S. while positioning itself as a leader in the way residential, industrial and commercial consumers think about and use energy products and services. NRG is responding to a consumer-driven change to the U.S. energy industry by offering cleaner, smarter and ultimately more portable energy while enabling personal energy choice, building on the strength of one of the nation’s largest and most diverse competitive power generation portfolios. The Company owns and operates approximately 51,000 MWs of generation; engages in the trading of wholesale energy, capacity and related products; transacts in and trades fuel and transportation services; and directly sells energy, services, and innovative, sustainable products and services to retail customers under the name “NRG” and various other retail brand names owned by NRG.

The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements in the Company's 2014 Form 10-K. Interim results are not necessarily indicative of results for a full year.

In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of March 31, 2015, and the results of operations, comprehensive income/(loss) and cash flows for the three months ended March 31, 2015, and 2014.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Reclassifications

Certain prior year amounts have been reclassified for comparative purposes. The reclassifications did not affect results from operations or cash flows.

XML

Changes in Capital Structure (Tables)

3 Months Ended

Mar. 31, 2015

Changes in Capital Structure Disclosure [Abstract]

Class of Treasury Stock [Table Text Block]

The following table reflects the repurchases made under the 2015 Capital Allocation Program:

	Total number of shares purchased	Average price paid per share (a)		Amounts paid for shares purchased (in millions) (a)
2015 Capital Allocation Program
December 2014	1,624,360	$	26.95	$	44
January 2015	1,755,976	25.19		44
February 2015	468,854	25.46		12
March 2015	921,654	24.92		23
Total Repurchases - First Quarter 2015	3,146,484			79
April 2015	1,328,329	24.47		33
Total Repurchases under 2015 Capital Allocation Program	6,099,173	—		$	156

(a) The average price paid per share and amounts paid for shares purchased excludes the commissions of $0.015 per share paid in connection with the share repurchase.

Changes in NRG's common shares issued and outstanding

The following table reflects the changes in NRG's common stock issued and outstanding:

	Issued	Treasury		Outstanding
Balance as of December 31, 2014	415,506,176	(78,843,552	)	336,662,624
Shares issued under LTIPs	1,176,486	—		1,176,486
Shares issued under ESPP	—	124,625		124,625
Shares repurchased under Capital Allocation Program	—	(3,146,484	)	(3,146,484	)
Balance as of March 31, 2015	416,682,662	(81,865,411	)	334,817,251

Schedule of dividends paid

The following table lists the dividends paid during the three months ended March 31, 2015:

	First Quarter 2015
Dividends per Common Share	$	0.145

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 1 - 2015 Sale to Yield) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Jan. 02, 2015	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term Debt	$ 20,509	$ 20,366
ROFO Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration Paid for Sale of Assets Under Common Control			489	357
Long-term Debt			737	612
Assets Transferred, Carrying Value			405	236
Working Capital Adjustment [Member] | ROFO Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration Paid for Sale of Assets Under Common Control			$ 9	$ 8

XML

Accounting for Derivative Instruments and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015 T	Dec. 31, 2014 T
Fair Value of Derivative Instrument
Derivative Assets	2,620	2,905
Derivative Liabilities	2,534	2,492
Derivatives Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	2
Derivative Liabilities	148	129
Derivatives Not Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	2,620	2,903
Derivative Liabilities	2,386	2,363
Interest rate contracts current | Derivatives Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	0
Derivative Liabilities	51	55
Interest rate contracts current | Derivatives Not Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	0
Derivative Liabilities	9	8
Interest rate contracts long-term | Derivatives Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	2
Derivative Liabilities	97	74
Interest rate contracts long-term | Derivatives Not Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	0
Derivative Liabilities	41	28
Commodity contracts current | Derivatives Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	0
Derivative Liabilities	0	0
Commodity contracts current | Derivatives Not Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	2,029	2,425
Derivative Liabilities	1,824	1,991
Commodity contracts long-term | Derivatives Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	0
Derivative Liabilities	0	0
Commodity contracts long-term | Derivatives Not Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	591	477
Derivative Liabilities	512	336
Equity Contract [Member]
Fair Value of Derivative Instrument
Derivative Assets		1
Equity Contract [Member] | Derivatives Not Designated as Cash Flow Hedges
Fair Value of Derivative Instrument
Derivative Assets	0	1
Derivative Liabilities	0	0
Emissions [Member] | Short Ton [Member]
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Mass	4,000,000	2,000,000
Coal [Member] | Short Ton [Member]
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Mass	48,000,000	57,000,000
Natural Gas [Member] | MMbtu [Member]
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Energy Measure	35,000,000	58,000,000
Oil [Member] | Barrel [Member]
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Volume	1,000,000	1,000,000
Power [Member] | M Wh [Member]
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Energy Measure	52,000,000	56,000,000
Capacity [Member] | MW/Day [Member]
Volumetric Underlying Derivative Transactions
Derivative, Nonmonetary Notional Amount, Energy Measure	1,000,000	0
Interest [Member] | United States of America, Dollars
Volumetric Underlying Derivative Transactions
Derivative, Notional Amount	3,399	3,440
Equity [Member] | Shares [Member]
Fair Value of Derivative Instrument
Derivative, Non-monetary Notional Amount, Other	2	2

XML

Condensed Consolidating Financial Information (Details 3) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014		Dec. 31, 2013
Current Assets
Cash and cash equivalents	$ 2,164		$ 2,116		$ 3,187		$ 2,254
Funds deposited by counterparties	68		72
Restricted cash	443		457
Accounts receivable-trade, net	1,179		1,322
Inventory	1,109		1,247
Derivative instruments	2,029		2,425
Cash collateral paid in support of energy risk management activities	400		187
Due from Affiliate, Current	7		9
Deferred income taxes	188		174
Renewable energy grant receivable, net	68		135
Prepayments and other current assets	467		612
Total current assets	8,122		8,582
Net property, plant and equipment	22,276		22,367
Other Assets
Investment in subsidiaries	0		0
Equity investments in affiliates	772		771
Capital leases and notes receivable, less current portion	67		72
Goodwill	2,520		2,574
Intangible assets, net	2,491		2,567
Nuclear decommissioning trust fund	586		585
Derivative instruments	591		480
Deferred income taxes	1,484		1,406
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	17		17
Other non-current assets	1,404		1,244
Total other assets	9,932		9,716
Total Assets	40,330		40,665
Current Liabilities
Current portion of long-term debt and capital leases	465		474
Accounts payable	1,045		1,060
Accounts payable — affiliate	0		0
Derivative instruments	1,884		2,054
Cash collateral received in support of energy risk management activities	68		72
Deferred Tax Liabilities, Net, Current			0
Accrued expenses and other current liabilities	1,047		1,199
Total current liabilities	4,509		4,859
Other Liabilities
Long-term debt and capital leases	20,050		19,900
Nuclear decommissioning reserve	314		310
Nuclear decommissioning reserve	328		333
Deferred income taxes	20		21
Derivative instruments	650		438
Out-of-market contracts, net of accumulated amortization of $585 and $562	1,221		1,244
Other non-current liabilities	1,549		1,574
Total non-current liabilities	24,132		23,820
Total Liabilities	28,641		28,679
3.625% convertible perpetual preferred stock	293		291
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	19		19
3.625% convertible perpetual preferred stock, interest rate (as a percentage)	2.822%		2.822%		3.625%
Total Stockholders' Equity	11,377		11,676
Total Liabilities and Stockholders’ Equity	40,330		40,665
Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	13		18		22		56
Funds deposited by counterparties	39		9
Restricted cash	14		5
Accounts receivable-trade, net	936		924
Inventory	505		537
Derivative instruments	1,480		1,657
Cash collateral paid in support of energy risk management activities	246		114
Due from Affiliate, Current	8,656		7,449
Deferred income taxes	0
Renewable energy grant receivable, net	0		0
Prepayments and other current assets	148		94
Total current assets	12,037		10,807
Net property, plant and equipment	8,260		8,344
Other Assets
Investment in subsidiaries	422		140
Equity investments in affiliates	(18)		(18)
Capital leases and notes receivable, less current portion	0		1
Goodwill	2,072		1,921
Intangible assets, net	859		765
Nuclear decommissioning trust fund	586		585
Derivative instruments	318		242
Deferred income taxes	(61)		(247)
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	0		0
Other non-current assets	112		113
Total other assets	4,290		3,502
Total Assets	24,587		22,653
Current Liabilities
Current portion of long-term debt and capital leases	1		1
Accounts payable	645		598
Accounts payable — affiliate	2,336		1,588
Derivative instruments	1,439		1,532
Cash collateral received in support of energy risk management activities	39		9
Deferred Tax Liabilities, Net, Current			7
Accrued expenses and other current liabilities	233		283
Total current liabilities	4,693		4,018
Other Liabilities
Long-term debt and capital leases	308		307
Nuclear decommissioning reserve	314		310
Nuclear decommissioning reserve	328		333
Deferred income taxes	1,284		1,036
Derivative instruments	369		248
Out-of-market contracts, net of accumulated amortization of $585 and $562	107		111
Other non-current liabilities	490		465
Total non-current liabilities	3,200		2,810
Total Liabilities	7,893		6,828
3.625% convertible perpetual preferred stock	0		0
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	0		0
Total Stockholders' Equity	16,694		15,825
Total Liabilities and Stockholders’ Equity	24,587		22,653
Non-Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	1,378		1,455		1,459		870
Funds deposited by counterparties	29		63
Restricted cash	427		451
Accounts receivable-trade, net	240		392
Inventory	604		710
Derivative instruments	938		1,209
Cash collateral paid in support of energy risk management activities	154		73
Due from Affiliate, Current	2,103		1,988
Deferred income taxes	93
Renewable energy grant receivable, net	68		134
Prepayments and other current assets	319		175
Total current assets	6,353		6,650
Net property, plant and equipment	13,847		13,877
Other Assets
Investment in subsidiaries	2,542		2,293
Equity investments in affiliates	841		891
Capital leases and notes receivable, less current portion	58		60
Goodwill	448		653
Intangible assets, net	1,637		1,806
Nuclear decommissioning trust fund	0		0
Derivative instruments	321		288
Deferred income taxes	652		816
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	17		17
Other non-current assets	681		623
Total other assets	7,197		7,447
Total Assets	27,397		27,974
Current Liabilities
Current portion of long-term debt and capital leases	445		444
Accounts payable	358		416
Accounts payable — affiliate	2,853		2,447
Derivative instruments	834		963
Cash collateral received in support of energy risk management activities	29		63
Deferred Tax Liabilities, Net, Current			0
Accrued expenses and other current liabilities	496		498
Total current liabilities	5,015		4,831
Other Liabilities
Long-term debt and capital leases	11,456		11,226
Nuclear decommissioning reserve	0		0
Nuclear decommissioning reserve	0		0
Deferred income taxes	(1,039)		(1,012)
Derivative instruments	330		241
Out-of-market contracts, net of accumulated amortization of $585 and $562	1,114		1,133
Other non-current liabilities	767		795
Total non-current liabilities	12,628		12,383
Total Liabilities	17,643		17,214
3.625% convertible perpetual preferred stock	0		0
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	19		19
Total Stockholders' Equity	9,735		10,741
Total Liabilities and Stockholders’ Equity	27,397		27,974
NRG Energy, Inc.
Current Assets
Cash and cash equivalents	773		643		1,706		1,328
Funds deposited by counterparties	0		0
Restricted cash	2		1
Accounts receivable-trade, net	3		6
Inventory	0		0
Derivative instruments	0		0
Cash collateral paid in support of energy risk management activities	0		0
Due from Affiliate, Current	(5,750)		(5,991)
Deferred income taxes	95
Renewable energy grant receivable, net	0		1
Prepayments and other current assets	0		343
Total current assets	(4,877)		(4,997)
Net property, plant and equipment	194		171
Other Assets
Investment in subsidiaries	21,907		23,410
Equity investments in affiliates	39		0
Capital leases and notes receivable, less current portion	221		109
Goodwill	0		0
Intangible assets, net	1		2
Nuclear decommissioning trust fund	0		0
Derivative instruments	1		1
Deferred income taxes	893		837
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	0		0
Other non-current assets	611		508
Total other assets	23,673		24,867
Total Assets	18,990		20,041
Current Liabilities
Current portion of long-term debt and capital leases	231		127
Accounts payable	42		46
Accounts payable — affiliate	(576)		(598)
Derivative instruments	0		0
Cash collateral received in support of energy risk management activities	0		0
Deferred Tax Liabilities, Net, Current			(7)
Accrued expenses and other current liabilities	318		418
Total current liabilities	15		(14)
Other Liabilities
Long-term debt and capital leases	8,286		8,367
Nuclear decommissioning reserve	0		0
Nuclear decommissioning reserve	0		0
Deferred income taxes	(225)		(3)
Derivative instruments	0		0
Out-of-market contracts, net of accumulated amortization of $585 and $562	0		0
Other non-current liabilities	292		314
Total non-current liabilities	8,353		8,678
Total Liabilities	8,368		8,664
3.625% convertible perpetual preferred stock	293		291
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	0		0
3.625% convertible perpetual preferred stock, interest rate (as a percentage)	2.822%		2.822%
Total Stockholders' Equity	10,329		11,086
Total Liabilities and Stockholders’ Equity	18,990		20,041
Eliminations
Current Assets
Cash and cash equivalents	0	[1]	0	[1]	0	[1]	0	[1]
Funds deposited by counterparties	0	[1]	0	[1]
Restricted cash	0	[1]	0	[1]
Accounts receivable-trade, net	0	[1]	0	[1]
Inventory	0	[1]	0	[1]
Derivative instruments	(389)	[1]	(441)	[1]
Cash collateral paid in support of energy risk management activities	0	[1]	0	[1]
Due from Affiliate, Current	(5,002)	[1]	(3,437)	[1]
Deferred income taxes	0	[1]
Renewable energy grant receivable, net	0	[1]	0	[1]
Prepayments and other current assets	0	[1]	0	[1]
Total current assets	(5,391)	[1]	(3,878)	[1]
Net property, plant and equipment	(25)	[1]	(25)	[1]
Other Assets
Investment in subsidiaries	(24,871)	[1]	(25,843)	[1]
Equity investments in affiliates	(90)	[1]	(102)	[1]
Capital leases and notes receivable, less current portion	(212)	[1]	(98)	[1]
Goodwill	0	[1]	0	[1]
Intangible assets, net	(6)	[1]	(6)	[1]
Nuclear decommissioning trust fund	0	[1]	0	[1]
Derivative instruments	(49)	[1]	(51)	[1]
Deferred income taxes	0	[1]	0	[1]
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	0	[1]	0	[1]
Other non-current assets	0	[1]	0	[1]
Total other assets	(25,228)	[1]	(26,100)	[1]
Total Assets	(30,644)	[1]	(30,003)	[1]
Current Liabilities
Current portion of long-term debt and capital leases	(212)	[1]	(98)	[1]
Accounts payable	0	[1]	0	[1]
Accounts payable — affiliate	(4,613)	[1]	(3,437)	[1]
Derivative instruments	(389)	[1]	(441)	[1]
Cash collateral received in support of energy risk management activities	0	[1]	0	[1]
Deferred Tax Liabilities, Net, Current			0	[1]
Accrued expenses and other current liabilities	0	[1]	0	[1]
Total current liabilities	(5,214)	[1]	(3,976)	[1]
Other Liabilities
Long-term debt and capital leases	0	[1]	0	[1]
Nuclear decommissioning reserve	0	[1]	0	[1]
Nuclear decommissioning reserve	0	[1]	0	[1]
Deferred income taxes	0	[1]	0	[1]
Derivative instruments	(49)	[1]	(51)	[1]
Out-of-market contracts, net of accumulated amortization of $585 and $562	0	[1]	0	[1]
Other non-current liabilities	0	[1]	0	[1]
Total non-current liabilities	(49)	[1]	(51)	[1]
Total Liabilities	(5,263)	[1]	(4,027)	[1]
3.625% convertible perpetual preferred stock	0	[1]	0	[1]
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	0	[1]	0	[1]
Total Stockholders' Equity	(25,381)	[1]	(25,976)	[1]
Total Liabilities and Stockholders’ Equity	$ (30,644)	[1]	$ (30,003)	[1]

[1] All significant intercompany transactions have been eliminated in consolidation.

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Condensed Consolidated Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Operating Revenues
Total operating revenues	$ 3,826	[1]	$ 3,486	[2]
Operating Costs and Expenses
Cost of operations	3,062		2,737
Depreciation and amortization	395		335
Selling, general and administrative	263		222
Acquisition-related transaction and integration costs	10		12
Development activity expenses	34		19
Total operating costs and expenses	3,764		3,325
Gain on postretirement benefits curtailment and sale of assets	14		19
Operating Income	76		180
Other Income/(Expense)
Equity in (loss)/earnings of unconsolidated affiliates	(3)		7
Other income, net	19		11
Loss on debt extinguishment	0		(41)
Interest expense	(301)		(255)
Total other expense	(285)		(278)
Loss Before Income Taxes	(209)		(98)
Income tax benefit	(73)		(31)
Net Loss	(136)		(67)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	(16)		(11)
Net Loss Attributable to NRG Energy, Inc.	(120)		(56)
Dividends for preferred shares	5		2
Loss Available for Common Stockholders	$ (125)		$ (58)
Loss per Share Attributable to NRG Energy, Inc. Common Stockholders
Weighted average number of common shares outstanding - basic and diluted	336		324
Loss per Weighted Average Common Share — Basic and Diluted	$ (0.37)		$ (0.18)
Dividends Per Common Share	$ 0.15		$ 0.12

[1] (a) Operating revenues include inter-segment sales and net derivative gains and losses of:$246 $— $— $— $— $33 $— $279

[2] (b) Operating revenues include inter-segment sales and net derivative gains and losses of:$113 $2 $— $— $— $26 $— $141

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Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 6 - Dominion) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 2,520	$ 2,574
Dominion [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	192
Business Acquisitions, Consideration Transferred, Purchase Price	165
Business Acquisition, Consideration Transferred, Working Capital	27
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	40
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	14
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Derivative Assets	21
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	47
Goodwill	91
Business Acquisition, Goodwill, Expected Tax Deductible Amount	8
Customer Relationships [Member] | Dominion [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	64
Trade Names [Member] | Dominion [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 9
Scenario, Plan [Member] | Dominion [Member]
Business Acquisition [Line Items]
Business Acquisition, Customers Acquired	540,000

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable - trade, allowance for doubtful accounts	$ 21	$ 23
Property, plant and equipment, accumulated depreciation	8,261	7,890
Intangible assets, accumulated amortization	1,511	1,402
Accumulated Amortization of Out of Market Contracts	$ 585	$ 562
3.625% convertible perpetual preferred stock, interest rate (as a percentage)	2.822%	2.822%
Treasury stock, shares (in shares)	81,865,411	78,843,552

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Debt and Capital Leases Debt and Capital Leases (Details 3 - Redemptions) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 10, 2014	Dec. 31, 2014	Apr. 01, 2014	Aug. 12, 2014
Debt and Capital Leases
Gains (Losses) on Extinguishment of Debt	$ 0	$ (41)
Long-term Debt	20,509			20,366
EME [Member]
Debt and Capital Leases
Long-term Debt					1,200
Alta Wind Portfolio [Member]
Debt and Capital Leases
Long-term Debt						1,600
Recourse Debt
Debt and Capital Leases
Gains (Losses) on Extinguishment of Debt		(33)
Long-term Debt	8,823			8,800
Recourse Debt | Senior Notes Due In 2019 850 [Member]
Debt and Capital Leases
Repayments of Senior Debt			308
Debt Instrument, Interest Rate, Stated Percentage	8.50%
Debt Instrument, Redemption Price, Percentage			106.992%
Recourse Debt | Senior Notes Due In 2019 7625 [Member]
Debt and Capital Leases
Repayments of Senior Debt			$ 91
Debt Instrument, Interest Rate, Stated Percentage	7.625%
Debt Instrument, Redemption Price, Percentage			105.50%

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The income tax provision consisted of the following:

	Three months ended March 31,
(In millions except otherwise noted)	2015			2014
Loss before income taxes	$	(209	)	$	(98	)
Income tax benefit	(73		)	(31		)
Effective tax rate	34.9		%	31.6		%

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Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Segment Reporting Information
Operating revenues	$ 3,826	[1]	$ 3,486	[2]
Depreciation and amortization	395		335
Equity in earnings/(losses) of unconsolidated affiliates	(3)		7
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(209)		(98)
Net Loss Attributable to NRG Energy, Inc.	(120)		(56)
Total Assets	40,330				40,665
Inter-Segment Sales	279		141
Loss on debt extinguishment	0		(41)
NRG Business [Member]
Segment Reporting Information
Operating revenues	2,506	[1]	2,346	[2]
Depreciation and amortization	233		225
Equity in earnings/(losses) of unconsolidated affiliates	(4)		5
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	29		(6)
Net Loss Attributable to NRG Energy, Inc.	29		(6)
Total Assets	28,744
Inter-Segment Sales	246		113
Loss on debt extinguishment			0
NRG Yield
Segment Reporting Information
Operating revenues	180	[1]	140	[2]
Depreciation and amortization	54		24
Equity in earnings/(losses) of unconsolidated affiliates	1		1
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(20)		29
Net Loss Attributable to NRG Energy, Inc.	(11)		22
Total Assets	6,595
Inter-Segment Sales	0		0
Loss on debt extinguishment			0
Corporate
Segment Reporting Information
Operating revenues	(7)	[1]	4	[2],[3]
Depreciation and amortization	7		6	[3]
Equity in earnings/(losses) of unconsolidated affiliates	(1)		2	[3]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(217)		(239)	[3]
Net Loss Attributable to NRG Energy, Inc.	(142)		(209)	[3]
Total Assets	31,493
Inter-Segment Sales	33		26
Loss on debt extinguishment			(40)
Elimination
Segment Reporting Information
Operating revenues	(279)	[1]	(141)	[2]
Depreciation and amortization	0		0
Equity in earnings/(losses) of unconsolidated affiliates	1		2
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	1		0
Net Loss Attributable to NRG Energy, Inc.	(5)		2
Total Assets	(40,105)
Inter-Segment Sales	0		0
Loss on debt extinguishment			0
NRG Home Retail [Member]
Segment Reporting Information
Operating revenues	1,311	[1]	1,082	[2]
Depreciation and amortization	30		30
Equity in earnings/(losses) of unconsolidated affiliates	0		0
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	104		185
Net Loss Attributable to NRG Energy, Inc.	104		185
Total Assets	6,270
Inter-Segment Sales	0		2
Loss on debt extinguishment			0
Home Solar [Member]
Segment Reporting Information
Operating revenues	5	[1]	2	[2]
Depreciation and amortization	6		1
Equity in earnings/(losses) of unconsolidated affiliates	0		0
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(45)		(2)
Net Loss Attributable to NRG Energy, Inc.	(45)		(2)
Total Assets	178
Inter-Segment Sales	0		0
Loss on debt extinguishment			0
NRG Renew [Member]
Segment Reporting Information
Operating revenues	110	[1]	53	[2],[3]
Depreciation and amortization	65		49	[3]
Equity in earnings/(losses) of unconsolidated affiliates	0		(3)	[3]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	(61)		(65)	[3]
Net Loss Attributable to NRG Energy, Inc.	(50)		(48)	[3]
Total Assets	7,155
Inter-Segment Sales	0		0
Loss on debt extinguishment			$ (1)

[1] (a) Operating revenues include inter-segment sales and net derivative gains and losses of:$246 $— $— $— $— $33 $— $279

[2] (b) Operating revenues include inter-segment sales and net derivative gains and losses of:$113 $2 $— $— $— $26 $— $141

[3] (c) Includes loss on debt extinguishment of:$— $— $— $(1) $— $(40) $— $(41)

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Environmental Matters

3 Months Ended

Mar. 31, 2015

Environmental Matters Disclosure [Abstract]

Environmental Matters

Environmental Matters

This footnote should be read in conjunction with the complete description under Note 24, Environmental Matters, to the Company's 2014 Form 10-K.

NRG is subject to a wide range of environmental laws in the development, construction, ownership and operation of projects. These laws generally require that governmental permits and approvals be obtained before construction and during operation of power plants. NRG is also subject to laws and regulations surrounding the protection of wildlife, including migratory birds, eagles and threatened and endangered species. Environmental laws have become increasingly stringent and NRG expects this trend to continue. The electric generation industry is likely to face new requirements to address various emissions, including GHG, as well as combustion byproducts, water discharge and use, and threatened and endangered species. In general, future laws are expected to require the addition of emissions controls or other environmental controls or to impose certain restrictions on the operations of the Company's facilities, which could have a material effect on the Company's operations.

The EPA finalized CSAPR in 2011, which was intended to replace CAIR in January 2012. In December 2011, the U.S. Court of Appeals for the District of Columbia Circuit stayed the implementation of CSAPR and then issued an opinion in August 2012 vacating CSAPR and keeping CAIR in place until the EPA could replace it. On April 29, 2014, the U.S. Supreme Court reversed and remanded the D.C. Circuit's decision. In October 2014, the D.C. Circuit lifted the stay of CSAPR. In response, the EPA issued an interim final rule in November 2014 to amend the CSAPR compliance dates. Accordingly, CSAPR replaced CAIR on January 1, 2015. On February 25, 2015, the D.C. Circuit held oral argument regarding several unresolved legal issues and the Company expects a decision in the second quarter of 2015. While NRG cannot predict the final outcome of the ongoing litigation, the Company believes its investment in pollution controls and cleaner technologies coupled with planned plant retirements should leave the fleet well positioned for compliance.

In December 2014, the EPA proposed making the NAAQS for ozone more stringent. The EPA anticipates promulgating a more stringent ozone NAAQS by October 2015. A more stringent NAAQS would obligate the states to develop plans to reduce NO_x (an ozone precursor), which might affect some of the Company's units.

In February 2012, the EPA promulgated standards to control emissions of HAPs from coal and oil-fired electric generating units. The rule established limits for mercury, non-mercury metals, certain organics and acid gases, which limits must be met beginning in April 2015 (with some units getting a 1-year extension). In November 2014, the U.S. Supreme Court agreed to review the D.C. Circuit decision that denied the petitions seeking to vacate MATS but the review is limited to whether the EPA unreasonably refused to consider costs in determining whether it is appropriate to regulate HAPs emitted by electric generating units. Oral argument in the U.S. Supreme Court occurred in March 2015, and the Company expects a decision in the second quarter of 2015.

In January 2014, the EPA re-proposed the NSPS for CO₂ emissions from new fossil-fuel-fired electric generating units that had been previously proposed in April 2012. The re-proposed standards are 1,000 pounds of CO₂ per MWh for large gas units and 1,100 pounds of CO₂ per MWh for coal units and small gas units. Proposed standards are in effect until a final rule is published or another rule is re-proposed. In June 2014, the EPA proposed a rule that would require states to develop CO₂ standards that would apply to existing fossil-fueled generating facilities. Specifically, the EPA proposed state-specific rate-based goals for CO₂ emissions, as well as guidelines for states to follow in developing plans to achieve the state-specific goals. The EPA anticipates finalizing both of these rules in the summer of 2015.

Water

In August 2014, the EPA finalized the regulation regarding the use of water for once through cooling at existing facilities to address impingement and entrainment concerns. NRG anticipates that more stringent requirements will be incorporated into some of its water discharge permits over the next several years.

Byproducts, Wastes, Hazardous Materials and Contamination

In April 2015, the EPA finalized the rule regulating byproducts of coal combustion (e.g., ash and gypsum) as solid wastes under the RCRA. In 2010, the EPA had proposed two alternatives. Under the first proposal, these byproducts would be regulated as solid wastes. Under the second proposal, these byproducts would have been regulated as “special wastes” in a manner similar to the regulation of hazardous waste with an exception for certain types of beneficial use of these byproducts. The second alternative would have imposed significantly more stringent requirements and materially increased the cost of disposal of coal combustion byproducts. The Company is evaluating the impact of the new rule on its results of operations, financial condition and cash flows.

East Region

Maryland Environmental Regulations — In December 2014, MDE proposed in the Maryland Register a regulation regarding NO_x emissions from coal-fired electric generating units, which if finalized would have required by 2020 the Company (at each of the three Dickerson coal-fired units and the Chalk Point coal-fired unit that does not have an SCR) to (1) install and operate an SCR; (2) retire the unit; or (3) convert the fuel source from coal to natural gas. Earlier this year, a new administration decided not to finalize the regulation as proposed. Later this year, the Company expects MDE to propose revised regulations to address future NO_x reductions, which when finalized may negatively affect certain of the Company’s coal-fired units in Maryland.

Environmental Capital Expenditures

Based on current (and in some cases proposed) rules, technology and preliminary plans based on some proposed rules, NRG estimates that environmental capital expenditures from 2015 through 2019 required to comply with environmental laws will be approximately $614 million which includes $57 million for GenOn and $440 million for Midwest Generation. These costs are primarily associated with (i) controls to satisfy MATS and the recent NSR settlement at Big Cajun II; (ii) controls to satisfy MATS at W.A. Parish, Limestone and Conemaugh; (iii) NO_x controls for Sayreville and Gilbert; and (iv) DSI/ESP upgrades at Waukegan and Powerton to satisfy the IL CPS and the Joliet gas conversion.

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Condensed Consolidating Financial Information (Tables)

3 Months Ended

Mar. 31, 2015

Condensed Consolidating Financial Information Disclosure [Abstract]

Condensed Consolidating Statements of Operations

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	2,563		$	1,303		$	—		$	(40	)	$	3,826
Operating Costs and Expenses
Cost of operations	2,104			995			12			(49		)	3,062
Depreciation and amortization	204			186			5			—			395
Selling, general and administrative	102			101			60			—			263
Acquisition-related transaction and integration costs	—			2			8			—			10
Development activity expenses	—			15			19			—			34
Total operating costs and expenses	2,410			1,299			104			(49		)	3,764
Gain on postretirement benefits curtailment	—			14			—			—			14
Operating Income/(Loss)	153			18			(104		)	9			76
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	(13		)	(8		)	50			(29		)	—
Equity in earnings of unconsolidated affiliates	—			(4		)	(1		)	2			(3		)
Other income, net	1			17			1			—			19
Loss on debt extinguishment	—			—			—			—			—
Interest expense	(4		)	(158		)	(139		)	—			(301		)
Total other expense	(16		)	(153		)	(89		)	(27		)	(285		)
Income/(Loss) Before Income Taxes	137			(135		)	(193		)	(18		)	(209		)
Income tax expense/(benefit)	54			(60		)	(67		)	—			(73		)
Net Income/(Loss)	83			(75		)	(126		)	(18		)	(136		)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	—			(21		)	(6		)	11			(16		)
Net Income/(Loss) Attributable to NRG Energy, Inc.	$	83		$	(54	)	$	(120	)	$	(29	)	$	(120	)

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	2,279		$	1,251		$	—		$	(44	)	$	3,486
Operating Costs and Expenses
Cost of operations	1,797			974			(4		)	(30		)	2,737
Depreciation and amortization	198			134			3			—			335
Selling, general and administrative	101			57			64			—			222
Acquisition-related transaction and integration costs	—			1			11			—			12
Development activity expenses	—			10			9			—			19
Total operating costs and expenses	2,096			1,176			83			(30		)	3,325
Gain on sale of assets	—			19			—			—			19
Operating Income/(Loss)	183			94			(83		)	(14		)	180
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	49			(6		)	115			(158		)	—
Equity in earnings of unconsolidated affiliates	4			1			—			2			7
Other income, net	1			4			7			(1		)	11
Loss on debt extinguishment	—			(9		)	(32		)	—			(41		)
Interest expense	(6		)	(107		)	(143		)	1			(255		)
Total other income/(expense)	48			(117		)	(53		)	(156		)	(278		)
Income/(Loss) Before Income Taxes	231			(23		)	(136		)	(170		)	(98		)
Income tax expense/(benefit)	63			(10		)	(84		)	—			(31		)
Net Loss	168			(13		)	(52		)	(170		)	(67		)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	—			(3		)	4			(12		)	(11		)
Net Income/(Loss) Attributable to NRG Energy, Inc.	$	168		$	(10	)	$	(56	)	$	(158	)	$	(56	)

(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Statements of Comprehensive Income/(Loss)

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Net Income/(Loss)	$	83		$	(75	)	$	(126	)	$	(18	)	$	(136	)
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	(7		)	11			(16		)	—			(12		)
Foreign currency translation adjustments, net	—			(9		)	(2		)	—			(11		)
Available-for-sale securities, net	—			(1		)	—			—			(1		)
Defined benefit plan, net	(3		)	(1		)	11			—			7
Other comprehensive (loss)/income	(10		)	—			(7		)	—			(17		)
Comprehensive Income/(Loss)	73			(75		)	(133		)	(18		)	(153		)
Less: Comprehensive income/(loss) attributable to noncontrolling interest and redeemable noncontrolling interest	—			(34		)	(6		)	11			(29		)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	73			(41		)	(127		)	(29		)	(124		)
Dividends for preferred shares	—			—			5			—			5
Comprehensive Income/(Loss) Available for Common Stockholders	$	73		$	(41	)	$	(132	)	$	(29	)	$	(129	)

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Net Income/(Loss)	$	168	$	(13	)	$	(52	)	$	(170	)	$	(67	)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain/(loss) on derivatives, net	6		(6		)	5			(14		)	(9		)
Foreign currency translation adjustments, net	—		6			—			—			6
Available-for-sale securities, net	—		—			4			2			6
Defined benefit plan	2		—			—			—			2
Other comprehensive income/(loss)	8		—			9			(12		)	5
Comprehensive Income/(Loss)	176		(13		)	(43		)	(182		)	(62		)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	—		(5		)	4			(14		)	(15		)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	176		(8		)	(47		)	(168		)	(47		)
Dividends for preferred shares	—		—			2			—			2
Comprehensive Income/(Loss) Available for Common Stockholders	$	176	$	(8	)	$	(49	)	$	(168	)	$	(49	)

(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Balance Sheets

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	13		$	1,378		$	773		$	—		$	2,164
Funds deposited by counterparties	39			29			—			—			68
Restricted cash	14			427			2			—			443
Accounts receivable, net	936			240			3			—			1,179
Inventory	505			604			—			—			1,109
Derivative instruments	1,480			938			—			(389		)	2,029
Cash collateral paid in support of energy risk management activities	246			154			—			—			400
Accounts receivable - affiliate	8,656			2,103			(5,750		)	(5,002		)	7
Deferred income taxes	—			93			95			—			188
Renewable energy grant receivable	—			68			—			—			68
Prepayments and other current assets	148			319			—			—			467
Total current assets	12,037			6,353			(4,877		)	(5,391		)	8,122
Net property, plant and equipment	8,260			13,847			194			(25		)	22,276
Other Assets
Investment in subsidiaries	422			2,542			21,907			(24,871		)	—
Equity investments in affiliates	(18		)	841			39			(90		)	772
Notes receivable, less current portion	—			58			221			(212		)	67
Goodwill	2,072			448			—			—			2,520
Intangible assets, net	859			1,637			1			(6		)	2,491
Nuclear decommissioning trust fund	586			—			—			—			586
Derivative instruments	318			321			1			(49		)	591
Deferred income tax	(61		)	652			893			—			1,484
Non-current assets held-for-sale	—			17			—			—			17
Other non-current assets	112			681			611			—			1,404
Total other assets	4,290			7,197			23,673			(25,228		)	9,932
Total Assets	$	24,587		$	27,397		$	18,990		$	(30,644	)	$	40,330
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	445		$	231		$	(212	)	$	465
Accounts payable	645			358			42			—			1,045
Accounts payable — affiliate	2,336			2,853			(576		)	(4,613		)	—
Derivative instruments	1,439			834			—			(389		)	1,884
Cash collateral received in support of energy risk management activities	39			29			—			—			68
Accrued expenses and other current liabilities	233			496			318			—			1,047
Total current liabilities	4,693			5,015			15			(5,214		)	4,509
Other Liabilities
Long-term debt and capital leases	308			11,456			8,286			—			20,050
Nuclear decommissioning reserve	314			—			—			—			314
Nuclear decommissioning trust liability	328			—			—			—			328
Deferred income taxes	1,284			(1,039		)	(225		)	—			20
Derivative instruments	369			330			—			(49		)	650
Out-of-market contracts	107			1,114			—			—			1,221
Other non-current liabilities	490			767			292			—			1,549
Total non-current liabilities	3,200			12,628			8,353			(49		)	24,132
Total liabilities	7,893			17,643			8,368			(5,263		)	28,641
2.822% convertible perpetual preferred stock	—			—			293			—			293
Redeemable noncontrolling interest in subsidiaries	—			19			—			—			19
Stockholders’ Equity	16,694			9,735			10,329			(25,381		)	11,377
Total Liabilities and Stockholders’ Equity	$	24,587		$	27,397		$	18,990		$	(30,644	)	$	40,330

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2014

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	18		$	1,455		$	643		$	—		$	2,116
Funds deposited by counterparties	9			63			—			—			72
Restricted cash	5			451			1			—			457
Accounts receivable, net	924			392			6			—			1,322
Inventory	537			710			—			—			1,247
Derivative instruments	1,657			1,209			—			(441		)	2,425
Accounts receivable - affiliate	7,449			1,988			(5,991		)	(3,437		)	9
Cash collateral paid in support of energy risk management activities	114			73			—			—			187
Renewable energy grant receivable	—			134			1			—			135
Prepayments and other current assets	94			175			343			—			612
Total current assets	10,807			6,650			(4,997		)	(3,878		)	8,582
Net Property, Plant and Equipment	8,344			13,877			171			(25		)	22,367
Other Assets
Investment in subsidiaries	140			2,293			23,410			(25,843		)	—
Equity investments in affiliates	(18		)	891			—			(102		)	771
Capital leases and notes receivable, less current portion	1			60			109			(98		)	72
Goodwill	1,921			653			—			—			2,574
Intangible assets, net	765			1,806			2			(6		)	2,567
Nuclear decommissioning trust fund	585			—			—			—			585
Deferred income taxes	(247		)	816			837			—			1,406
Derivative instruments	242			288			1			(51		)	480
Non-current assets held for sale	—			17			—			—			17
Other non-current assets	113			623			508			—			1,244
Total other assets	3,502			7,447			24,867			(26,100		)	9,716
Total Assets	$	22,653		$	27,974		$	20,041		$	(30,003	)	$	40,665
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	444		$	127		$	(98	)	$	474
Accounts payable	598			416			46			—			1,060
Accounts payable — affiliate	1,588			2,447			(598		)	(3,437		)	—
Deferred Income Taxes	7			—			(7		)	—			—
Derivative instruments	1,532			963			—			(441		)	2,054
Cash collateral received in support of energy risk management activities	9			63			—			—			72
Accrued expenses and other current liabilities	283			498			418			—			1,199
Total current liabilities	4,018			4,831			(14		)	(3,976		)	4,859
Other Liabilities
Long-term debt and capital leases	307			11,226			8,367			—			19,900
Nuclear decommissioning reserve	310			—			—			—			310
Nuclear decommissioning trust liability	333			—			—			—			333
Deferred income taxes	1,036			(1,012		)	(3		)	—			21
Derivative instruments	248			241			—			(51		)	438
Out-of-market contracts	111			1,133			—			—			1,244
Other non-current liabilities	465			795			314			—			1,574
Total non-current liabilities	2,810			12,383			8,678			(51		)	23,820
Total Liabilities	6,828			17,214			8,664			(4,027		)	28,679
2.822% Preferred Stock	—			—			291			—			291
Redeemable noncontrolling interest in subsidiaries	—			19			—			—			19
Stockholders’ Equity	15,825			10,741			11,086			(25,976		)	11,676
Total Liabilities and Stockholders’ Equity	$	22,653		$	27,974		$	20,041		$	(30,003	)	$	40,665

(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Statements of Cash Flows

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Cash Flows from Operating Activities
Net Cash Provided/(Used) by Operating Activities	$	820		$	(430	)	$	(539	)	$	409		$	260
Cash Flows from Investing Activities
(Payments for)/proceeds from intercompany loans to subsidiaries	(737		)	328			409			—			—
Acquisition of businesses, net of cash acquired	—			(1		)	—			—			(1		)
Capital expenditures	(89		)	(157		)	(6		)	—			(252		)
Increase in restricted cash, net	—			(11		)	—			—			(11		)
Decrease/(increase) in restricted cash — U.S. DOE projects	—			24			1			—			25
Decrease in notes receivable	—			5			—			—			5
Investments in nuclear decommissioning trust fund securities	(193		)	—			—			—			(193		)
Proceeds from sales of nuclear decommissioning trust fund securities	196			—			—			—			196
Proceeds from renewable energy grants	—			2			—			—			2
Other	(2		)	(2		)	(37		)	—			(41		)
Net Cash Used by Investing Activities	(825		)	188			367			—			(270		)
Cash Flows from Financing Activities
Proceeds/(payments) from intercompany loans	—			—			409			(409		)	—
Payment of dividends to common and preferred stockholders	—			—			(51		)	—			(51		)
Payment for treasury stock	—			—			(79		)	—			(79		)
Net payments for settlement of acquired derivatives that include financing elements	—			40			—			—			40
Proceeds from issuance of long-term debt	—			221			27			—			248
Contributions to, net of distributions from, noncontrolling interest in subsidiaries	—			(25		)	—			—			(25		)
Proceeds from issuance of common stock	—			—			1			—			1
Payments for short and long-term debt	—			(89		)	(5		)	—			(94		)
Net Cash Provided by Financing Activities	—			147			302			(409		)	40
Effect of exchange rate changes on cash and cash equivalents	—			18			—			—			18
Net (Decrease)/Increase in Cash and Cash Equivalents	(5		)	(77		)	130			—			48
Cash and Cash Equivalents at Beginning of Period	18			1,455			643			—			2,116
Cash and Cash Equivalents at End of Period	$	13		$	1,378		$	773		$	—		$	2,164

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated Balance
	(In millions)
Cash Flows from Operating Activities
Net Cash Provided by Operating Activities	$	446		$	430		$	(886	)	$	401		$	391
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	(405		)	4			401			—			—
Acquisition of businesses, net of cash acquired	—			(25		)	(193		)	—			(218		)
Capital expenditures	(73		)	(162		)	(2		)	—			(237		)
(Increase)/decrease in restricted cash, net	—			3			—			—			3
Increase in restricted cash — U.S. DOE projects	(4		)	60			—			—			56
Decrease/(increase) in notes receivable	—			1			—			—			1
Investments in nuclear decommissioning trust fund securities	(188		)	—			—			—			(188		)
Proceeds from sales of nuclear decommissioning trust fund securities	183			—			—			—			183
Proceeds from renewable energy grants	—			387			—			—			387
Proceeds from sale of assets	—			—			77			—			77
Cash proceeds to fund cash grant bridge loan payment	—			57			—			—			57
Other	7			(4		)	—			—			3
Net Cash (Used)/Provided by Investing Activities	(480		)	321			283			—			124
Cash Flows from Financing Activities
Proceeds from intercompany loans	—			—			401			(401		)	—
Payment of dividends to preferred stockholders	—			—			(41		)	—			(41		)
Net (payment for)/receipts from settlement of acquired derivatives that include financing elements	—			(223		)	—			—			(223		)
Proceeds from issuance of long-term debt	—			464			1,100			—			1,564
Proceeds from issuance of common stock	—			—			3			—			3
Sale proceeds and other contributions from noncontrolling interest in subsidiaries	—			9			—			—			9
Payment of debt issuance costs	—			(9		)	(14		)	—			(23		)
Payments for short and long-term debt	—			(405		)	(468		)	—			(873		)
Net Cash (Used)/Provided by Financing Activities	—			(164		)	981			(401		)	416
Effect of exchange rate changes on cash and cash equivalents	—			2			—			—			2
Net (Decrease)/Increase in Cash and Cash Equivalents	(34		)	589			378			—			933
Cash and Cash Equivalents at Beginning of Period	56			870			1,328			—			2,254
Cash and Cash Equivalents at End of Period	$	22		$	1,459		$	1,706		$	—		$	3,187

(a) All significant intercompany transactions have been eliminated in consolidation.

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Summary of Significant Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Business Description and Basis of Presentation [Text Block]

The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with the SEC's regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements in the Company's 2014 Form 10-K. Interim results are not necessarily indicative of results for a full year.

In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of March 31, 2015, and the results of operations, comprehensive income/(loss) and cash flows for the three months ended March 31, 2015, and 2014.

Reclassification, Policy [Policy Text Block]

Reclassifications

Certain prior year amounts have been reclassified for comparative purposes. The reclassifications did not affect results from operations or cash flows.

Use of Estimates (Policy)

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Cash Flow, Supplemental Disclosures [Text Block]

Other Cash Flow Information

NRG’s investing activities exclude capital expenditures of $40 million which were accrued and unpaid at March 31, 2015

New Accounting Pronouncements, Policy [Policy Text Block]

Recent Accounting Developments

ASU 2015-03 — In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs, or ASU No. 2015-03. The amendments of ASU No. 2015-03 were issued to reduce complexity in the balance sheet presentation of debt issuance costs. ASU No. 2015-03 requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this standard. The guidance in ASU No. 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted for financial statements that have not been previously issued. The adoption of this standard is not expected to have a material impact on the Company's balance sheets on a gross basis and will have no impact on net assets.

ASU 2015-02 — In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis, or ASU No. 2015-02. The amendments of ASU No. 2015-02 were issued in an effort to minimize situations under previously existing guidance in which a reporting entity was required to consolidate another legal entity in which that reporting entity did not have: (1) the ability through contractual rights to act primarily on its own behalf; (2) ownership of the majority of the legal entity's voting rights; or (3) the exposure to a majority of the legal entity's economic benefits. ASU No. 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The guidance in ASU No. 2015-02 is effective for periods beginning after December 15, 2015. Early adoption is permitted. The Company adopted the standard effective January 1, 2015 and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position.

ASU 2014-16 — In November 2014, the FASB issued ASU No. 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity, or ASU No. 2014-16. The amendments of ASU No. 2014-16 clarify how U.S. GAAP should be applied in determining whether the nature of a host contract is more akin to debt or equity and in evaluating whether the economic characteristics and risks of an embedded feature are "clearly and closely related" to its host contract. The guidance in ASU No. 2014-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company adopted the standard effective January 1, 2015 and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position.

ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.

Nuclear Decommissioning (Policy)

NRG's Nuclear Decommissioning Trust Fund assets are comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounts for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations, because the Company's nuclear decommissioning activities are subject to approval by the PUCT with regulated rates that are designed to recover all decommissioning costs and that can be charged to and collected from the ratepayers per PUCT mandate. Since the Company is in compliance with PUCT rules and regulations regarding decommissioning trusts and the cost of decommissioning is the responsibility of the Texas ratepayers, not NRG, all realized and unrealized gains or losses (including other-than-temporary impairments) related to the Nuclear Decommissioning Trust Fund are recorded to nuclear decommissioning trust liability and are not included in net income or accumulated other comprehensive income, consistent with regulatory treatment.

Segment Reporting (Policy)

Effective in December 2014, the Company's segment structure and its allocation of corporate expenses were updated to reflect how management currently makes financial decisions and allocates resources. The Company has recast data from prior periods to reflect this change in reportable segments to conform to the current year presentation. The Company's businesses are segregated as follows: NRG Business, which includes conventional power generation, the carbon capture business and energy services; NRG Home, which includes NRG Home Retail, consisting of residential retail services and products, and NRG Home Solar, which includes the installation and leasing of residential solar systems and the sale of solar energy services; NRG Renew, which includes solar and wind assets, excluding those in the NRG Yield segment; NRG Yield; and corporate activities.  NRG Yield includes certain of the Company's contracted generation assets. On January 2, 2015, NRG Yield, Inc. acquired three projects from the Company: Walnut Creek formerly in the NRG Business segment, the Tapestry projects (Buffalo Bear, Pinnacle and Taloga) and Laredo Ridge, both formerly in the NRG Renew segment. As the transaction was accounted for as a transfer of entities under common control, all historical periods have been recast to reflect this change. The Company's corporate segment includes international business and electric vehicle services. Intersegment sales are accounted for at market.

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Regulatory Matters (Details) (Genon [Member], USD $) In Millions, unless otherwise specified	Dec. 20, 2013
Genon [Member]
Regulatory Matters [Line Items]
Regulatory payments sought	$ 22

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Condensed Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities
Net Loss	$ (136)	$ (67)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates	32	(2)
Depreciation and amortization	395	335
Provision for bad debts	15	21
Amortization of nuclear fuel	13	11
Amortization of financing costs and debt discount/premiums	(4)	(5)
Adjustment for debt extinguishment	0	19
Amortization of intangibles and out-of-market contracts	19	13
Amortization of unearned equity compensation	11	8
Changes in deferred income taxes and liability for uncertain tax benefits	(83)	(111)
Changes in nuclear decommissioning trust liability	(3)	5
Changes in derivative instruments	261	525
Changes in collateral deposits supporting energy risk management activities	(213)	(407)
Gain on postretirement benefits curtailment and sale of assets	(14)	(19)
Cash used by changes in other working capital	(33)	65
Net Cash Provided by Operating Activities	260	391
Cash Flows from Investing Activities
Acquisitions of businesses, net of cash acquired	(1)	(218)
Capital expenditures	(252)	(237)
(Increase)/decrease in restricted cash, net	(11)	3
Decrease in restricted cash to support equity requirements for U.S. DOE funded projects	25	56
Decrease in notes receivable	5	1
Investments in nuclear decommissioning trust fund securities	(193)	(188)
Proceeds from the sale of nuclear decommissioning trust fund securities	196	183
Proceeds from renewable energy grants and state rebates	2	387
Proceeds from sale of assets, net of cash disposed of	0	77
Cash proceeds to fund cash grant bridge loan payment	0	57
Other	(41)	3
Net Cash (Used)/Provided by Investing Activities	(270)	124
Cash Flows from Financing Activities
Payment of dividends to common and preferred stockholders	(51)	(41)
Payment for treasury stock	(79)	0
Net receipts/(payments for) from settlement of acquired derivatives that include financing elements	40	(223)
Proceeds from issuance of long-term debt	248	1,564
Contributions to, net of distributions from, noncontrolling interest in subsidiaries	(25)	9
Proceeds from issuance of common stock	1	3
Payment of debt issuance costs	0	(23)
Payments for short and long-term debt	(94)	(873)
Net Cash Provided by Financing Activities	40	416
Effect of exchange rate changes on cash and cash equivalents	18	2
Net Increase in Cash and Cash Equivalents	48	933
Cash and Cash Equivalents at Beginning of Period	2,116	2,254
Cash and Cash Equivalents at End of Period	$ 2,164	$ 3,187

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Condensed Consolidated Statements of Comprehensive Income/(Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Loss	$ (136)	$ (67)
Other Comprehensive (Loss)/Income, net of tax
Unrealized loss on derivatives, net of income tax benefit of $6 and $3	(12)	(9)
Foreign currency translation adjustments, net of income tax (benefit)/expense of $(7) and $2	(11)	6
Available-for-sale securities, net of income tax (benefit)/expense of $(4) and $2	(1)	6
Defined benefit plans, net of tax expense of $4 and $0	7	2
Other comprehensive (loss)/income	(17)	5
Comprehensive Loss	(153)	(62)
Less: Comprehensive loss attributable to noncontrolling interest and redeemable noncontrolling interests	29	15
Comprehensive Loss Attributable to NRG Energy, Inc.	(124)	(47)
Dividends for preferred shares	5	2
Comprehensive Loss Available for Common Stockholders	$ (129)	$ (49)

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Earnings Per Share

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share

Loss Per Share

Basic loss per common share is computed by dividing net loss less accumulated preferred stock dividends by the weighted average number of common shares outstanding. Shares issued and treasury shares repurchased during the year are weighted for the portion of the year that they were outstanding. Diluted loss per share is computed in a manner consistent with that of basic loss per share while giving effect to all potentially dilutive common shares that were outstanding during the period. The reconciliation of NRG's basic and diluted loss per share is shown in the following table:

	Three months ended March 31,
(In millions, except per share data)	2015			2014
Basic and diluted loss per share attributable to NRG Energy, Inc. common stockholders
Net loss attributable to NRG Energy, Inc.	$	(120	)	$	(56	)
Dividends for preferred shares	5			2
Loss available for common stockholders	$	(125	)	$	(58	)
Weighted average number of common shares outstanding - basic and diluted	336			324
Loss per weighted average common share — basic and diluted	$	(0.37	)	$	(0.18	)

The following table summarizes NRG’s outstanding equity instruments that are anti-dilutive and were not included in the computation of the Company’s diluted loss per share:

	Three months ended March 31,
(In millions of shares)	2015	2014
Equity compensation plans	7	8
Embedded derivative of 2.822% redeemable perpetual preferred stock(a)	16	16
Total	23	24

(a) As of March 31, 2014, the redeemable perpetual preferred stock had an interest rate of 3.625%.

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Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	NRG ENERGY, INC.
Entity Central Index Key	0001013871
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		333,494,559
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1

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Segment Reporting

3 Months Ended

Mar. 31, 2015

Segment Reporting Disclosure [Abstract]

Segment Reporting

Segment Reporting

Effective in December 2014, the Company's segment structure and its allocation of corporate expenses were updated to reflect how management currently makes financial decisions and allocates resources. The Company has recast data from prior periods to reflect this change in reportable segments to conform to the current year presentation. The Company's businesses are segregated as follows: NRG Business, which includes conventional power generation, the carbon capture business and energy services; NRG Home, which includes NRG Home Retail, consisting of residential retail services and products, and NRG Home Solar, which includes the installation and leasing of residential solar systems and the sale of solar energy services; NRG Renew, which includes solar and wind assets, excluding those in the NRG Yield segment; NRG Yield; and corporate activities.  NRG Yield includes certain of the Company's contracted generation assets. On January 2, 2015, NRG Yield, Inc. acquired three projects from the Company: Walnut Creek formerly in the NRG Business segment, the Tapestry projects (Buffalo Bear, Pinnacle and Taloga) and Laredo Ridge, both formerly in the NRG Renew segment. As the transaction was accounted for as a transfer of entities under common control, all historical periods have been recast to reflect this change. The Company's corporate segment includes international business and electric vehicle services. Intersegment sales are accounted for at market.

				NRG Home
(In millions)	NRG Business(a)			Retail(a)		Solar(a)			NRG Renew(a)			NRG Yield(a)			Corporate(a)			Eliminations			Total
Three months ended March 31, 2015	(in millions)
Operating revenues(a)	$	2,506		$	1,311	$	5		$	110		$	180		$	(7	)	$	(279	)	$	3,826
Depreciation and amortization	233			30		6			65			54			7			—			395
Equity in (loss)/earnings of unconsolidated affiliates	(4		)	—		—			—			1			(1		)	1			(3		)
Income/(loss) before income taxes	29			104		(45		)	(61		)	(20		)	(217		)	1			(209		)
Net income/(loss) attributable to NRG Energy, Inc.	$	29		$	104	$	(45	)	$	(50	)	$	(11	)	$	(142	)	$	(5	)	(120		)
Total assets as of March 31, 2015	$	28,744		$	6,270	$	178		$	7,155		$	6,595		$	31,493		$	(40,105	)	$	40,330

(a) Operating revenues include inter-segment sales and net derivative gains and losses of: $ 246 $ — $ — $ — $ — $ 33 $ — $ 279

				NRG Home
(In millions)	NRG Business(b)			Retail(b)		Solar(b)			NRG Renew(b)(c)			NRG Yield(b)		Corporate(b)(c)			Eliminations			Total
Three months ended March 31, 2014	(in millions)
Operating revenues(b)	$	2,346		$	1,082	$	2		$	53		$	140	$	4		$	(141	)	$	3,486
Depreciation and amortization	225			30		1			49			24		6			—			335
Equity in earnings/(loss) of unconsolidated affiliates	5			—		—			(3		)	1		2			2			7
(Loss)/income before income taxes	(6		)	185		(2		)	(65		)	29		(239		)	—			(98		)
Net (loss)/income attributable to NRG Energy, Inc.	$	(6	)	$	185	$	(2	)	$	(48	)	$	22	$	(209	)	$	2		(56		)

(b) Operating revenues include inter-segment sales and net derivative gains and losses of: $ 113 $ 2 $ — $ — $ — $ 26 $ — $ 141

(c) Includes loss on debt extinguishment of: $ — $ — $ — $ (1 ) $ — $ (40 ) $ — $ (41 )

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Condensed Consolidated Statement of Comprehensive Loss Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gain/loss on derivatives, income tax benefit	$ (6)	$ (3)
Foreign currency translation adjustments, income tax benefit	(7)	2
Available-for-sale securities, income tax expense	(4)	2
Defined benefit plans, income tax expense	$ (4)	$ 0

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Nuclear Decommissioning Trust Fund

3 Months Ended

Mar. 31, 2015

Nuclear Decommissioning Trust Fund Disclosure [Abstract]

Nuclear Decommissioning Trust Fund

Nuclear Decommissioning Trust Fund

This footnote should be read in conjunction with the complete description under Note 6, Nuclear Decommissioning Trust Fund, to the Company's 2014 Form 10-K.

NRG's Nuclear Decommissioning Trust Fund assets are comprised of securities classified as available-for-sale and recorded at fair value based on actively quoted market prices. NRG accounts for the Nuclear Decommissioning Trust Fund in accordance with ASC 980, Regulated Operations, because the Company's nuclear decommissioning activities are subject to approval by the PUCT with regulated rates that are designed to recover all decommissioning costs and that can be charged to and collected from the ratepayers per PUCT mandate. Since the Company is in compliance with PUCT rules and regulations regarding decommissioning trusts and the cost of decommissioning is the responsibility of the Texas ratepayers, not NRG, all realized and unrealized gains or losses (including other-than-temporary impairments) related to the Nuclear Decommissioning Trust Fund are recorded to nuclear decommissioning trust liability and are not included in net income or accumulated other comprehensive income, consistent with regulatory treatment.

The following table summarizes the aggregate fair values and unrealized gains and losses (including other-than-temporary impairments) for the securities held in the trust funds, as well as information about the contractual maturities of those securities.

	As of March 31, 2015							As of December 31, 2014
(In millions, except otherwise noted)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)	Fair Value		Unrealized Gains		Unrealized Losses		Weighted-average Maturities (In years)
Cash and cash equivalents	$	5	$	—	$	—	—	$	14	$	—	$	—	—
U.S. government and federal agency obligations	53		3		—		10	47		2		—		11
Federal agency mortgage-backed securities	71		2		—		24	74		2		—		25
Commercial mortgage-backed securities	24		—		1		30	25		—		1		30
Corporate debt securities	84		2		—		10	78		2		1		11
Equity securities	347		211		—		—	344		211		—		—
Foreign government fixed income securities	2		—		—		15	3		1		—		16
Total	$	586	$	218	$	1		$	585	$	218	$	2

The following table summarizes proceeds from sales of available-for-sale securities and the related realized gains and losses from these sales. The cost of securities sold is determined on the specific identification method.

	Three months ended March 31,
	2015		2014
	(In millions)
Realized gains	$	6	$	3
Realized losses	2		1
Proceeds from sale of securities	196		183

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2015

Fair Value of Financial Instruments Disclosure [Abstract]

Fair Value of Financial Instruments

Fair Value of Financial Instruments

This footnote should be read in conjunction with the complete description under Note 4, Fair Value of Financial Instruments, to the Company's 2014 Form 10-K.

For cash and cash equivalents, funds deposited by counterparties, accounts and other receivables, accounts payable, restricted cash, and cash collateral paid and received in support of energy risk management activities, the carrying amount approximates fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy.

The estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value are as follows:

	As of March 31, 2015				As of December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Assets:
Notes receivable (a)	$	86	$	86	$	91	$	91
Liabilities:
Long-term debt, including current portion	$	20,509	$	20,679	$	20,366	$	20,361

(a) Includes the current portion of notes receivable which is recorded in prepayments and other current assets on the Company's consolidated balance sheets.

The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non publicly-traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy.

Recurring Fair Value Measurements

Debt securities, equity securities, and trust fund investments, which are comprised of various U.S. debt and equity securities, and derivative assets and liabilities, are carried at fair market value.

The following tables present assets and liabilities measured and recorded at fair value on the Company's condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:

	As of March 31, 2015
	Fair Value
(In millions)	Level 1		Level 2		Level 3		Total
Investment in available-for-sale securities (classified within other     non-current assets):
Debt securities	$	—	$	—	$	18	$	18
Available-for-sale securities	24		—		—		24
Other (a)	20		—		11		31
Nuclear trust fund investments:
Cash and cash equivalents	5		—		—		5
U.S. government and federal agency obligations	50		3		—		53
Federal agency mortgage-backed securities	—		71		—		71
Commercial mortgage-backed securities	—		24		—		24
Corporate debt securities	—		84		—		84
Equity securities	293		—		54		347
Foreign government fixed income securities	—		2		—		2
Other trust fund investments:
U.S. government and federal agency obligations	1		—		—		1
Derivative assets:
Commodity contracts	998		1,358		264		2,620
Total assets	$	1,391	$	1,542	$	347	$	3,280
Derivative liabilities:
Commodity contracts	$	964	$	1,142	$	230	$	2,336
Interest rate contracts	—		198		—		198
Total liabilities	$	964	$	1,340	$	230	$	2,534

(a) Consists primarily of mutual funds held in a Rabbi Trust for non-qualified deferred compensation plans for certain former employees and a total return swap that does not meet the definition of a derivative.

	As of December 31, 2014
	Fair Value
(In millions)	Level 1		Level 2		Level 3		Total
Investment in available-for-sale securities (classified within other non-current assets):
Debt securities	$	—	$	—	$	18	$	18
Available-for-sale securities	30		—		—		30
Other (a)	21		—		11		32
Nuclear trust fund investments:
Cash and cash equivalents	14		—		—		14
U.S. government and federal agency obligations	44		3		—		47
Federal agency mortgage-backed securities	—		74		—		74
Commercial mortgage-backed securities	—		25		—		25
Corporate debt securities	—		78		—		78
Equity securities	292		—		52		344
Foreign government fixed income securities	—		3		—		3
Other trust fund investments:
U.S. government and federal agency obligations	1		—		—		1
Derivative assets:
Commodity contracts	1,078		1,515		309		2,902
Interest rate contracts	—		2		—		2
Equity contracts	—		—		1		1
Total assets	$	1,480	$	1,700	$	391	$	3,571
Derivative liabilities:
Commodity contracts	$	1,004	$	1,093	$	230	$	2,327
Interest rate contracts	—		165		—		165
Total liabilities	$	1,004	$	1,258	$	230	$	2,492

(a) Primarily consists of mutual funds held in rabbi trusts for non-qualified deferred compensation plans for certain former employees.

There were no transfers during the three months ended March 31, 2015, and 2014 between Levels 1 and 2. The following tables reconcile, for the three months ended March 31, 2015, and 2014, the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended March 31, 2015
(In millions)	Debt Securities		Other		Trust Fund Investments		Derivatives(a)			Total
Beginning balance	$	18	$	11	$	52	$	80		$	161
Total gains/(losses) — realized/unrealized:
Included in earnings	—		—		—		(55		)	(55		)
Included in nuclear decommissioning obligation	—		—		2		—			2
Purchases	—		—		—		(4		)	(4		)
Transfers into Level 3 (b)	—		—		—		15			15
Transfers out of Level 3 (b)	—		—		—		(2		)	(2		)
Ending balance as of March 31, 2015	$	18	$	11	$	54	$	34		$	117
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2015	$	—	$	—	$	—	(20		)	$	(20	)

(a) Consists of derivative assets and liabilities, net.

(b) Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended March 31, 2014
(In millions)	Debt Securities		Other		Trust Fund Investments		Derivatives(a)			Total
Beginning balance	$	16	$	10	$	56	$	13		$	95
Total gains/(losses) — realized/unrealized:
Included in earnings	—		1		—		16			17
Included in OCI	2		—		—		—			2
Purchases	—		—		—		(21		)	(21		)
Contracts acquired in Dominion acquisition	—		—		—		3			3
Transfers into Level 3 (b)	—		—		—		18			18
Transfers out of Level 3 (b)	—		—		—		(6		)	(6		)
Ending balance as of March 31, 2014	$	18	$	11	$	56	$	23		$	108
Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2014	—		—		—		19			19

(a) Consists of derivative assets and liabilities, net.

(b) Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

Realized and unrealized gains and losses included in earnings that are related to energy derivatives are recorded in operating revenues and cost of operations.

Derivative Fair Value Measurements

A portion of NRG's contracts are exchange-traded contracts with readily available quoted market prices. A majority of NRG's contracts are non-exchange-traded contracts valued using prices provided by external sources, primarily price quotations available through brokers or over-the-counter and on-line exchanges. The remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available for the whole term or for certain delivery months or the contracts are retail and load following power contracts. These contracts are valued using various valuation techniques including but not limited to internal models that apply fundamental analysis of the market and corroboration with similar markets. As of March 31, 2015, contracts valued with prices provided by models and other valuation techniques make up 10% of the total derivative assets and 9% of the total derivative liabilities.

The fair value of each contract is discounted using a risk free interest rate. In addition, the Company applies a credit reserve to reflect credit risk which is calculated based on published default probabilities. As of March 31, 2015, the credit reserve resulted in a $5 million increase in fair value which is composed of a $3 million gain in OCI and a $2 million gain in operating revenue and cost of operations. As of March 31, 2014, the credit reserve was not a material amount.

Concentration of Credit Risk

In addition to the credit risk discussion as disclosed in Note 2, Summary of Significant Accounting Policies, to the Company's 2014 Form 10-K, the following is a discussion of the concentration of credit risk for the Company's contractual obligations. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. NRG is exposed to counterparty credit risk through various activities including wholesale sales, fuel purchases and retail supply arrangements, and retail customer credit risk through its retail load activities.

Counterparty Credit Risk

The Company's counterparty credit risk policies are disclosed in its 2014 Form 10-K. As of March 31, 2015, counterparty credit exposure, excluding credit risk exposure under certain long term agreements, was $842 million and NRG held collateral (cash and letters of credit) against those positions of $84 million, resulting in a net exposure of $763 million. Approximately 91% of the Company's exposure before collateral is expected to roll off by the end of 2016. Counterparty credit exposure is valued through observable market quotes and discounted at a risk free interest rate. The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for NRG with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market and NPNS, and non-derivative transactions. The exposure is shown net of collateral held, and includes amounts net of receivables or payables.

	Net Exposure (a)
Category	(% of Total)
Financial institutions	48	%
Utilities, energy merchants, marketers and other	32
ISOs	20
Total as of March 31, 2015	100	%

	Net Exposure (a)
Category	(% of Total)
Investment grade	96	%
Non-rated (b)	2
Non-investment grade	2
Total as of March 31, 2015	100	%

(a) Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices.

(b) For non-rated counterparties, a significant portion are related to ISO and municipal public power entities, which are considered investment grade equivalent ratings based on NRG's internal credit ratings.

NRG has counterparty credit risk exposure to certain counterparties, each of which represent more than 10% of total net exposure discussed above. The aggregate of such counterparties' exposure was $290 million as of March 31, 2015. Changes in hedge positions and market prices will affect credit exposure and counterparty concentration. Given the credit quality, diversification and term of the exposure in the portfolio, NRG does not anticipate a material impact on the Company's financial position or results of operations from nonperformance by any of NRG's counterparties.

Counterparty credit exposure described above excludes credit risk exposure under certain long term agreements, including California tolling agreements, Gulf Coast load obligations, wind and solar PPAs, and a coal supply agreement. As external sources or observable market quotes are not available to estimate such exposure, the Company estimates its credit exposure for these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Based on these valuation techniques, as of March 31, 2015, aggregate credit risk exposure managed by NRG to these counterparties was approximately $3.3 billion, including $2.3 billion related to assets of NRG Yield, Inc., for the next five years. This amount excludes potential credit exposures for projects with long-term PPAs that have not reached commercial operations. The majority of these power contracts are with utilities or public power entities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations and other technology and market factors, which NRG is unable to predict. In the case of the coal supply agreement, NRG holds a lien against the underlying asset which significantly reduces the risk of loss.

Retail Customer Credit Risk

NRG is exposed to retail credit risk through the Company's retail electricity providers, which serve commercial, industrial and governmental/institutional customers and the Mass market. Retail credit risk results when a customer fails to pay for products or services rendered. The losses may result from both nonpayment of customer accounts receivable and the loss of in-the-money forward value. NRG manages retail credit risk through the use of established credit policies that include monitoring of the portfolio, and the use of credit mitigation measures such as deposits or prepayment arrangements.

As of March 31, 2015, the Company believes its retail customer credit exposure was diversified across many customers and various industries, as well as government entities.

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Condensed Consolidating Financial Information

3 Months Ended

Mar. 31, 2015

Condensed Consolidating Financial Information Disclosure [Abstract]

Condensed Consolidating Financial Information

Condensed Consolidating Financial Information

As of March 31, 2015, the Company had outstanding $6.4 billion of Senior Notes due from 2018 - 2024, as shown in Note 7, Debt and Capital Leases. These Senior Notes are guaranteed by certain of NRG's current and future 100% owned domestic subsidiaries, or guarantor subsidiaries. These guarantees are both joint and several. The non-guarantor subsidiaries include all of NRG's foreign subsidiaries and certain domestic subsidiaries, including GenOn and its subsidiaries and NRG Yield, Inc. and its subsidiaries.

Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes as of March 31, 2015:

Ace Energy, Inc.	NEO Freehold-Gen LLC	NRG Operating Services, Inc.
Allied Warranty LLC	NEO Power Services Inc.	NRG Oswego Harbor Power Operations Inc.
Arthur Kill Power LLC	New Genco GP, LLC	NRG PacGen Inc.
Astoria Gas Turbine Power LLC	Norwalk Power LLC	NRG Portable Power LLC
Bayou Cove Peaking Power, LLC	NRG Affiliate Services Inc.	NRG Power Marketing LLC
BidURenergy, Inc.	NRG Artesian Energy LLC	NRG Reliability Solutions LLC
Cabrillo Power I LLC	NRG Arthur Kill Operations Inc.	NRG Renter's Protection LLC
Cabrillo Power II LLC	NRG Astoria Gas Turbine Operations Inc.	NRG Retail LLC
Carbon Management Solutions LLC	NRG Bayou Cove LLC	NRG Retail Northeast LLC
Cirro Group, Inc.	NRG Business Solutions LLC	NRG Rockford Acquisition LLC
Cirro Energy Services, Inc.	NRG Cabrillo Power Operations Inc.	NRG Saguaro Operations Inc.
Clean Edge Energy LLC	NRG California Peaker Operations LLC	NRG Security LLC
Conemaugh Power LLC	NRG Cedar Bayou Development Company, LLC	NRG Services Corporation
Connecticut Jet Power LLC	NRG Connected Home LLC	NRG SimplySmart Solutions LLC
Cottonwood Development LLC	NRG Connecticut Affiliate Services Inc.	NRG South Central Affiliate Services Inc.
Cottonwood Energy Company LP	NRG Construction LLC	NRG South Central Generating LLC
Cottonwood Generating Partners I LLC	NRG Curtailment Solutions LLC	NRG South Central Operations Inc.
Cottonwood Generating Partners II LLC	NRG Development Company Inc.	NRG South Texas LP
Cottonwood Generating Partners III LLC	NRG Devon Operations Inc.	NRG Texas C&I Supply LLC
Cottonwood Technology Partners LP	NRG Dispatch Services LLC	NRG Texas Gregory LLC
Devon Power LLC	NRG Distributed Generation PR LLC	NRG Texas Holding Inc.
Dunkirk Power LLC	NRG Dunkirk Operations Inc.	NRG Texas LLC
Eastern Sierra Energy Company LLC	NRG El Segundo Operations Inc.	NRG Texas Power LLC
El Segundo Power, LLC	NRG Energy Efficiency-L LLC	NRG Warranty Services LLC
El Segundo Power II LLC	NRG Energy Efficiency-P LLC	NRG West Coast LLC
Energy Alternatives Wholesale, LLC	NRG Energy Labor Services LLC	NRG Western Affiliate Services Inc.
Energy Curtailment Specialists, Inc.	NRG Energy Services Group LLC	O'Brien Cogeneration, Inc. II
Energy Plus Holdings LLC	NRG Energy Services International Inc.	ONSITE Energy, Inc.
Energy Plus Natural Gas LLC	NRG Energy Services LLC	Oswego Harbor Power LLC
Energy Protection Insurance Company	NRG Generation Holdings, Inc.	RE Retail Receivables, LLC
Everything Energy LLC	NRG Home & Business Solutions LLC	Reliant Energy Northeast LLC
Forward Home Security LLC	NRG Home Services LLC	Reliant Energy Power Supply, LLC
GCP Funding Company, LLC	NRG Home Solutions LLC	Reliant Energy Retail Holdings, LLC
Green Mountain Energy	NRG Home Solutions Product LLC	Reliant Energy Retail Services, LLC
Green Mountain Energy Co LLC	NRG Homer City Services LLC	RERH Holdings LLC
Gregory Partners, LLC	NRG Huntley Operations Inc.	Saguaro Power LLC
Gregory Power Partners LLC	NRG HQ DC LLC	Somerset Operations Inc.
Huntley Power LLC	NRG Identity Protect LLC	Somerset Power LLC
Independence Energy Alliance LLC	NRG Ilion Limited Partnership	Texas Genco Financing Corp.
Independence Energy Group LLC	NRG Ilion LP LLC	Texas Genco GP, LLC
Independence Energy Natural Gas LLC	NRG International LLC	Texas Genco Holdings, Inc.
Indian River Operations Inc.	NRG Maintenance Services LLC	Texas Genco LP, LLC
Indian River Power LLC	NRG Mextrans Inc.	Texas Genco Operating Services, LLC
Keystone Power LLC	NRG MidAtlantic Affiliate Services Inc.	Texas Genco Services, LP
Langford Wind Power, LLC	NRG Middletown Operations Inc.	US Retailers LLC
Louisiana Generating LLC	NRG Montville Operations Inc.	Vienna Operations Inc.
Meriden Gas Turbines LLC	NRG New Roads Holdings LLC	Vienna Power LLC
Middletown Power LLC	NRG North Central Operations Inc.	WCP (Generation) Holdings LLC
Montville Power LLC	NRG Northeast Affiliate Services Inc.	West Coast Power LLC
NEO Corporation	NRG Norwalk Harbor Operations Inc.

NRG conducts much of its business through and derives much of its income from its subsidiaries. Therefore, the Company's ability to make required payments with respect to its indebtedness and other obligations depends on the financial results and condition of its subsidiaries and NRG's ability to receive funds from its subsidiaries. There are no restrictions on the ability of any of the guarantor subsidiaries to transfer funds to NRG. However, there may be restrictions for certain non-guarantor subsidiaries.

The following condensed consolidating financial information presents the financial information of NRG Energy, Inc., the guarantor subsidiaries and the non-guarantor subsidiaries in accordance with Rule 3-10 under the SEC Regulation S-X. The financial information may not necessarily be indicative of results of operations or financial position had the guarantor subsidiaries or non-guarantor subsidiaries operated as independent entities.

In this presentation, NRG Energy, Inc. consists of parent company operations. Guarantor subsidiaries and non-guarantor subsidiaries of NRG are reported on an equity basis. For companies acquired, the fair values of the assets and liabilities acquired have been presented on a push-down accounting basis.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	2,563		$	1,303		$	—		$	(40	)	$	3,826
Operating Costs and Expenses
Cost of operations	2,104			995			12			(49		)	3,062
Depreciation and amortization	204			186			5			—			395
Selling, general and administrative	102			101			60			—			263
Acquisition-related transaction and integration costs	—			2			8			—			10
Development activity expenses	—			15			19			—			34
Total operating costs and expenses	2,410			1,299			104			(49		)	3,764
Gain on postretirement benefits curtailment	—			14			—			—			14
Operating Income/(Loss)	153			18			(104		)	9			76
Other Income/(Expense)
Equity in earnings of consolidated subsidiaries	(13		)	(8		)	50			(29		)	—
Equity in earnings of unconsolidated affiliates	—			(4		)	(1		)	2			(3		)
Other income, net	1			17			1			—			19
Loss on debt extinguishment	—			—			—			—			—
Interest expense	(4		)	(158		)	(139		)	—			(301		)
Total other expense	(16		)	(153		)	(89		)	(27		)	(285		)
Income/(Loss) Before Income Taxes	137			(135		)	(193		)	(18		)	(209		)
Income tax expense/(benefit)	54			(60		)	(67		)	—			(73		)
Net Income/(Loss)	83			(75		)	(126		)	(18		)	(136		)
Less: Net loss attributable to noncontrolling interest and redeemable noncontrolling interests	—			(21		)	(6		)	11			(16		)
Net Income/(Loss) Attributable to NRG Energy, Inc.	$	83		$	(54	)	$	(120	)	$	(29	)	$	(120	)

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Net Income/(Loss)	$	83		$	(75	)	$	(126	)	$	(18	)	$	(136	)
Other Comprehensive Income/(Loss), net of tax
Unrealized (loss)/gain on derivatives, net	(7		)	11			(16		)	—			(12		)
Foreign currency translation adjustments, net	—			(9		)	(2		)	—			(11		)
Available-for-sale securities, net	—			(1		)	—			—			(1		)
Defined benefit plan, net	(3		)	(1		)	11			—			7
Other comprehensive (loss)/income	(10		)	—			(7		)	—			(17		)
Comprehensive Income/(Loss)	73			(75		)	(133		)	(18		)	(153		)
Less: Comprehensive income/(loss) attributable to noncontrolling interest and redeemable noncontrolling interest	—			(34		)	(6		)	11			(29		)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	73			(41		)	(127		)	(29		)	(124		)
Dividends for preferred shares	—			—			5			—			5
Comprehensive Income/(Loss) Available for Common Stockholders	$	73		$	(41	)	$	(132	)	$	(29	)	$	(129	)

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	13		$	1,378		$	773		$	—		$	2,164
Funds deposited by counterparties	39			29			—			—			68
Restricted cash	14			427			2			—			443
Accounts receivable, net	936			240			3			—			1,179
Inventory	505			604			—			—			1,109
Derivative instruments	1,480			938			—			(389		)	2,029
Cash collateral paid in support of energy risk management activities	246			154			—			—			400
Accounts receivable - affiliate	8,656			2,103			(5,750		)	(5,002		)	7
Deferred income taxes	—			93			95			—			188
Renewable energy grant receivable	—			68			—			—			68
Prepayments and other current assets	148			319			—			—			467
Total current assets	12,037			6,353			(4,877		)	(5,391		)	8,122
Net property, plant and equipment	8,260			13,847			194			(25		)	22,276
Other Assets
Investment in subsidiaries	422			2,542			21,907			(24,871		)	—
Equity investments in affiliates	(18		)	841			39			(90		)	772
Notes receivable, less current portion	—			58			221			(212		)	67
Goodwill	2,072			448			—			—			2,520
Intangible assets, net	859			1,637			1			(6		)	2,491
Nuclear decommissioning trust fund	586			—			—			—			586
Derivative instruments	318			321			1			(49		)	591
Deferred income tax	(61		)	652			893			—			1,484
Non-current assets held-for-sale	—			17			—			—			17
Other non-current assets	112			681			611			—			1,404
Total other assets	4,290			7,197			23,673			(25,228		)	9,932
Total Assets	$	24,587		$	27,397		$	18,990		$	(30,644	)	$	40,330
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	445		$	231		$	(212	)	$	465
Accounts payable	645			358			42			—			1,045
Accounts payable — affiliate	2,336			2,853			(576		)	(4,613		)	—
Derivative instruments	1,439			834			—			(389		)	1,884
Cash collateral received in support of energy risk management activities	39			29			—			—			68
Accrued expenses and other current liabilities	233			496			318			—			1,047
Total current liabilities	4,693			5,015			15			(5,214		)	4,509
Other Liabilities
Long-term debt and capital leases	308			11,456			8,286			—			20,050
Nuclear decommissioning reserve	314			—			—			—			314
Nuclear decommissioning trust liability	328			—			—			—			328
Deferred income taxes	1,284			(1,039		)	(225		)	—			20
Derivative instruments	369			330			—			(49		)	650
Out-of-market contracts	107			1,114			—			—			1,221
Other non-current liabilities	490			767			292			—			1,549
Total non-current liabilities	3,200			12,628			8,353			(49		)	24,132
Total liabilities	7,893			17,643			8,368			(5,263		)	28,641
2.822% convertible perpetual preferred stock	—			—			293			—			293
Redeemable noncontrolling interest in subsidiaries	—			19			—			—			19
Stockholders’ Equity	16,694			9,735			10,329			(25,381		)	11,377
Total Liabilities and Stockholders’ Equity	$	24,587		$	27,397		$	18,990		$	(30,644	)	$	40,330

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2015

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Cash Flows from Operating Activities
Net Cash Provided/(Used) by Operating Activities	$	820		$	(430	)	$	(539	)	$	409		$	260
Cash Flows from Investing Activities
(Payments for)/proceeds from intercompany loans to subsidiaries	(737		)	328			409			—			—
Acquisition of businesses, net of cash acquired	—			(1		)	—			—			(1		)
Capital expenditures	(89		)	(157		)	(6		)	—			(252		)
Increase in restricted cash, net	—			(11		)	—			—			(11		)
Decrease/(increase) in restricted cash — U.S. DOE projects	—			24			1			—			25
Decrease in notes receivable	—			5			—			—			5
Investments in nuclear decommissioning trust fund securities	(193		)	—			—			—			(193		)
Proceeds from sales of nuclear decommissioning trust fund securities	196			—			—			—			196
Proceeds from renewable energy grants	—			2			—			—			2
Other	(2		)	(2		)	(37		)	—			(41		)
Net Cash Used by Investing Activities	(825		)	188			367			—			(270		)
Cash Flows from Financing Activities
Proceeds/(payments) from intercompany loans	—			—			409			(409		)	—
Payment of dividends to common and preferred stockholders	—			—			(51		)	—			(51		)
Payment for treasury stock	—			—			(79		)	—			(79		)
Net payments for settlement of acquired derivatives that include financing elements	—			40			—			—			40
Proceeds from issuance of long-term debt	—			221			27			—			248
Contributions to, net of distributions from, noncontrolling interest in subsidiaries	—			(25		)	—			—			(25		)
Proceeds from issuance of common stock	—			—			1			—			1
Payments for short and long-term debt	—			(89		)	(5		)	—			(94		)
Net Cash Provided by Financing Activities	—			147			302			(409		)	40
Effect of exchange rate changes on cash and cash equivalents	—			18			—			—			18
Net (Decrease)/Increase in Cash and Cash Equivalents	(5		)	(77		)	130			—			48
Cash and Cash Equivalents at Beginning of Period	18			1,455			643			—			2,116
Cash and Cash Equivalents at End of Period	$	13		$	1,378		$	773		$	—		$	2,164

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Operating Revenues
Total operating revenues	$	2,279		$	1,251		$	—		$	(44	)	$	3,486
Operating Costs and Expenses
Cost of operations	1,797			974			(4		)	(30		)	2,737
Depreciation and amortization	198			134			3			—			335
Selling, general and administrative	101			57			64			—			222
Acquisition-related transaction and integration costs	—			1			11			—			12
Development activity expenses	—			10			9			—			19
Total operating costs and expenses	2,096			1,176			83			(30		)	3,325
Gain on sale of assets	—			19			—			—			19
Operating Income/(Loss)	183			94			(83		)	(14		)	180
Other Income/(Expense)
Equity in earnings/(losses) of consolidated subsidiaries	49			(6		)	115			(158		)	—
Equity in earnings of unconsolidated affiliates	4			1			—			2			7
Other income, net	1			4			7			(1		)	11
Loss on debt extinguishment	—			(9		)	(32		)	—			(41		)
Interest expense	(6		)	(107		)	(143		)	1			(255		)
Total other income/(expense)	48			(117		)	(53		)	(156		)	(278		)
Income/(Loss) Before Income Taxes	231			(23		)	(136		)	(170		)	(98		)
Income tax expense/(benefit)	63			(10		)	(84		)	—			(31		)
Net Loss	168			(13		)	(52		)	(170		)	(67		)
Less: Net (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	—			(3		)	4			(12		)	(11		)
Net Income/(Loss) Attributable to NRG Energy, Inc.	$	168		$	(10	)	$	(56	)	$	(158	)	$	(56	)

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries		Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
	(In millions)
Net Income/(Loss)	$	168	$	(13	)	$	(52	)	$	(170	)	$	(67	)
Other Comprehensive (Loss)/Income, net of tax
Unrealized gain/(loss) on derivatives, net	6		(6		)	5			(14		)	(9		)
Foreign currency translation adjustments, net	—		6			—			—			6
Available-for-sale securities, net	—		—			4			2			6
Defined benefit plan	2		—			—			—			2
Other comprehensive income/(loss)	8		—			9			(12		)	5
Comprehensive Income/(Loss)	176		(13		)	(43		)	(182		)	(62		)
Less: Comprehensive (loss)/income attributable to noncontrolling interest and redeemable noncontrolling interest	—		(5		)	4			(14		)	(15		)
Comprehensive Income/(Loss) Attributable to NRG Energy, Inc.	176		(8		)	(47		)	(168		)	(47		)
Dividends for preferred shares	—		—			2			—			2
Comprehensive Income/(Loss) Available for Common Stockholders	$	176	$	(8	)	$	(49	)	$	(168	)	$	(49	)

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING BALANCE SHEETS

December 31, 2014

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated
ASSETS	(In millions)
Current Assets
Cash and cash equivalents	$	18		$	1,455		$	643		$	—		$	2,116
Funds deposited by counterparties	9			63			—			—			72
Restricted cash	5			451			1			—			457
Accounts receivable, net	924			392			6			—			1,322
Inventory	537			710			—			—			1,247
Derivative instruments	1,657			1,209			—			(441		)	2,425
Accounts receivable - affiliate	7,449			1,988			(5,991		)	(3,437		)	9
Cash collateral paid in support of energy risk management activities	114			73			—			—			187
Renewable energy grant receivable	—			134			1			—			135
Prepayments and other current assets	94			175			343			—			612
Total current assets	10,807			6,650			(4,997		)	(3,878		)	8,582
Net Property, Plant and Equipment	8,344			13,877			171			(25		)	22,367
Other Assets
Investment in subsidiaries	140			2,293			23,410			(25,843		)	—
Equity investments in affiliates	(18		)	891			—			(102		)	771
Capital leases and notes receivable, less current portion	1			60			109			(98		)	72
Goodwill	1,921			653			—			—			2,574
Intangible assets, net	765			1,806			2			(6		)	2,567
Nuclear decommissioning trust fund	585			—			—			—			585
Deferred income taxes	(247		)	816			837			—			1,406
Derivative instruments	242			288			1			(51		)	480
Non-current assets held for sale	—			17			—			—			17
Other non-current assets	113			623			508			—			1,244
Total other assets	3,502			7,447			24,867			(26,100		)	9,716
Total Assets	$	22,653		$	27,974		$	20,041		$	(30,003	)	$	40,665
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt and capital leases	$	1		$	444		$	127		$	(98	)	$	474
Accounts payable	598			416			46			—			1,060
Accounts payable — affiliate	1,588			2,447			(598		)	(3,437		)	—
Deferred Income Taxes	7			—			(7		)	—			—
Derivative instruments	1,532			963			—			(441		)	2,054
Cash collateral received in support of energy risk management activities	9			63			—			—			72
Accrued expenses and other current liabilities	283			498			418			—			1,199
Total current liabilities	4,018			4,831			(14		)	(3,976		)	4,859
Other Liabilities
Long-term debt and capital leases	307			11,226			8,367			—			19,900
Nuclear decommissioning reserve	310			—			—			—			310
Nuclear decommissioning trust liability	333			—			—			—			333
Deferred income taxes	1,036			(1,012		)	(3		)	—			21
Derivative instruments	248			241			—			(51		)	438
Out-of-market contracts	111			1,133			—			—			1,244
Other non-current liabilities	465			795			314			—			1,574
Total non-current liabilities	2,810			12,383			8,678			(51		)	23,820
Total Liabilities	6,828			17,214			8,664			(4,027		)	28,679
2.822% Preferred Stock	—			—			291			—			291
Redeemable noncontrolling interest in subsidiaries	—			19			—			—			19
Stockholders’ Equity	15,825			10,741			11,086			(25,976		)	11,676
Total Liabilities and Stockholders’ Equity	$	22,653		$	27,974		$	20,041		$	(30,003	)	$	40,665

(a) All significant intercompany transactions have been eliminated in consolidation.

NRG ENERGY, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS

For the Three Months Ended March 31, 2014

(Unaudited)

	Guarantor Subsidiaries			Non-Guarantor Subsidiaries			NRG Energy, Inc. (Note Issuer)			Eliminations(a)			Consolidated Balance
	(In millions)
Cash Flows from Operating Activities
Net Cash Provided by Operating Activities	$	446		$	430		$	(886	)	$	401		$	391
Cash Flows from Investing Activities
Intercompany loans to subsidiaries	(405		)	4			401			—			—
Acquisition of businesses, net of cash acquired	—			(25		)	(193		)	—			(218		)
Capital expenditures	(73		)	(162		)	(2		)	—			(237		)
(Increase)/decrease in restricted cash, net	—			3			—			—			3
Increase in restricted cash — U.S. DOE projects	(4		)	60			—			—			56
Decrease/(increase) in notes receivable	—			1			—			—			1
Investments in nuclear decommissioning trust fund securities	(188		)	—			—			—			(188		)
Proceeds from sales of nuclear decommissioning trust fund securities	183			—			—			—			183
Proceeds from renewable energy grants	—			387			—			—			387
Proceeds from sale of assets	—			—			77			—			77
Cash proceeds to fund cash grant bridge loan payment	—			57			—			—			57
Other	7			(4		)	—			—			3
Net Cash (Used)/Provided by Investing Activities	(480		)	321			283			—			124
Cash Flows from Financing Activities
Proceeds from intercompany loans	—			—			401			(401		)	—
Payment of dividends to preferred stockholders	—			—			(41		)	—			(41		)
Net (payment for)/receipts from settlement of acquired derivatives that include financing elements	—			(223		)	—			—			(223		)
Proceeds from issuance of long-term debt	—			464			1,100			—			1,564
Proceeds from issuance of common stock	—			—			3			—			3
Sale proceeds and other contributions from noncontrolling interest in subsidiaries	—			9			—			—			9
Payment of debt issuance costs	—			(9		)	(14		)	—			(23		)
Payments for short and long-term debt	—			(405		)	(468		)	—			(873		)
Net Cash (Used)/Provided by Financing Activities	—			(164		)	981			(401		)	416
Effect of exchange rate changes on cash and cash equivalents	—			2			—			—			2
Net (Decrease)/Increase in Cash and Cash Equivalents	(34		)	589			378			—			933
Cash and Cash Equivalents at Beginning of Period	56			870			1,328			—			2,254
Cash and Cash Equivalents at End of Period	$	22		$	1,459		$	1,706		$	—		$	3,187

(a) All significant intercompany transactions have been eliminated in consolidation.

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Income Taxes

3 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Effective Tax Rate

The income tax provision consisted of the following:

	Three months ended March 31,
(In millions except otherwise noted)	2015			2014
Loss before income taxes	$	(209	)	$	(98	)
Income tax benefit	(73		)	(31		)
Effective tax rate	34.9		%	31.6		%

For the three months ended March 31, 2015, NRG's overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of production tax credits generated from our wind assets partially offset by non-taxable equity earnings and tax expense attributable to consolidated partnerships.

For the three months ended March 31, 2014, NRG's overall effective tax rate was different than the statutory rate of 35% primarily due to the impact of non-taxable equity earnings, production tax credits and the impact of state and local income taxes.

Uncertain Tax Benefits

As of March 31, 2015, NRG has recorded a non-current tax liability of $55 million for uncertain tax benefits from positions taken on various state income tax returns, including accrued interest. For the three months ended March 31, 2015, NRG accrued an insignificant amount of interest relating to the uncertain tax benefits. As of March 31, 2015, NRG had cumulative interest and penalties related to these uncertain tax benefits of $6 million . The Company recognizes interest and penalties related to uncertain tax benefits in income tax expense.

NRG is subject to examination by taxing authorities for income tax returns filed in the U.S. federal jurisdiction and various state and foreign jurisdictions including operations located in Australia. The Company is not subject to U.S. federal income tax examinations for years prior to 2011. With few exceptions, state and local income tax examinations are no longer open for years before 2009. The Company's primary foreign operations are also no longer subject to examination by local jurisdictions for years prior to 2010.

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Variable Interest Entities

3 Months Ended

Mar. 31, 2015

Variable Interest Entities Disclosure [Abstract]

Variable Interest Entity

Variable Interest Entities, or VIEs

Entities that are not Consolidated

NRG has interests in entities that are considered VIEs under ASC 810, Consolidation, but NRG is not considered the primary beneficiary.  NRG accounts for its interests in these entities under the equity method of accounting.

GenConn Energy LLC — Through its consolidated subsidiary, Yield Operating, the Company owns a 50% interest in GenConn, which owns and operates two190 MW peaking generation facilities in Connecticut at NRG's Devon and Middletown sites. NRG's maximum exposure to loss is limited to its equity investment, which was $112 million as of March 31, 2015.

Sherbino I Wind Farm LLC — NRG owns a 50% interest in Sherbino, a joint venture with BP Wind Energy North America Inc. NRG's maximum exposure to loss is limited to its equity investment, which was $81 million as of March 31, 2015.

Entities that are Consolidated

Capistrano Wind Partners — Through the acquisition of EME, the Company has a controlling financial interest in Capistrano Wind Partners, whose Class B preferred equity interest are held by outside investors. Capistrano Wind Partners holds 100% ownership in five projects generating 411 MW of wind capacity. The five wind projects include Cedro Hill located in Texas, Mountain Wind Power I, located in Wyoming, Mountain Wind Power II located in Wyoming, Crofton Bluffs located in Nebraska, and Broken Bow I located in Nebraska.

Under the terms of the Capistrano Wind Partners formation documents, the holders of the Class B preferred equity interests receive 100% of the cash available for distribution, up to a scheduled amount to target a certain return and thereafter cash distributions are shared. The Company retains indirect beneficial ownership of the wind projects and retains responsibilities for managing the operations of Capistrano Wind Partners. Accordingly, the Company consolidates these projects. The Company does not consolidate Capistrano Wind Partners for tax purposes.

The summarized financial information for Capistrano Wind Holdings consisted of the following:

(In millions)	March 31, 2015
Current assets	$	28
Net property, plant and equipment	578
Other long-term assets	137
Total assets	743
Current liabilities	36
Long-term debt	180
Other long-term liabilities	154
Total liabilities	370
Noncontrolling interests	348
Net assets less noncontrolling interests	$	25

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Debt and Capital Leases Debt and Capital Leases (Details 4 - Yield and Peakers) (USD $)	3 Months Ended	2 Months Ended
	Mar. 31, 2014	Apr. 02, 2015	Mar. 31, 2015		Dec. 31, 2014	Jan. 02, 2015	Jun. 30, 2014	Apr. 25, 2014	Feb. 21, 2014
Debt and Capital Leases
Convertible Debt	$ 345,000,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt	23,000,000
Long-term Debt			20,509,000,000		20,366,000,000
Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt			11,686,000,000		11,566,000,000
5.375% Senior Notes due in 2024 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Debt Instrument, Interest Rate, Stated Percentage			5.375%	[1]
Long-term Debt			500,000,000		500,000,000
Convertible Debt [Member]
Debt and Capital Leases
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Debt Instrument, Convertible, Conversion Price	$ 46.55
Debt Instrument, Convertible, Conversion Ratio	21.4822
Debt Instrument, Face Amount	1,000
NRG Yield Revolving Credit Facility [Member]
Debt and Capital Leases
Repayments of Debt		15,000,000
Line of Credit Facility, Maximum Borrowing Capacity							60,000,000	450,000,000
Long-term Debt						210,000,000
Letters of Credit, Issued Amount			36,000,000
NRG Peaker Finance Co. LLC Bonds Due 2019 [Member]
Debt and Capital Leases
Debt Instrument, Repurchased Face Amount									30,000,000
Debt Instrument, Repurchase Amount									35,000,000
NRG Peaker Finance Co. LLC Bonds Due 2019 [Member] | Non Recourse Debt [Member]
Debt and Capital Leases
Long-term Debt			$ 101,000,000		$ 100,000,000

[1] As of March 31, 2015, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan which is 6 month LIBOR plus x% and the NRG West Holdings LLC term loan, NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC Revolving Credit facility which are 1 month LIBOR plus x%.

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Accounting for Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Accounting for Derivative Instruments and Hedging Activities

Accounting for Derivative Instruments and Hedging Activities

This footnote should be read in conjunction with the complete description under Note 5, Accounting for Derivative Instruments and Hedging Activities, to the Company's 2014 Form 10-K.

Energy-Related Commodities

As of March 31, 2015, NRG had energy-related derivative instruments extending through 2024. The Company voluntarily de-designated all remaining commodity cash flow hedges as of January 1, 2014, and prospectively marked these derivatives to market through the income statement.

Interest Rate Swaps

NRG is exposed to changes in interest rates through the Company's issuance of variable and fixed rate debt. In order to manage the Company's interest rate risk, NRG enters into interest rate swap agreements. As of March 31, 2015, the Company had interest rate derivative instruments on non-recourse debt extending through 2032, most of which are designated as cash flow hedges.

Volumetric Underlying Derivative Transactions

The following table summarizes the net notional volume buy/(sell) of NRG's open derivative transactions broken out by category, excluding those derivatives that qualified for the NPNS exception as of March 31, 2015, and December 31, 2014. Option contracts are reflected using delta volume. Delta volume equals the notional volume of an option adjusted for the probability that the option will be in-the-money at its expiration date.

		Total Volume
		March 31, 2015			December 31, 2014
Category	Units	(In millions)
Emissions	Short Ton	4			2
Coal	Short Ton	48			57
Natural Gas	MMBtu	(35		)	(58		)
Oil	Barrel	1			1
Power	MWh	(52		)	(56		)
Capacity	MW/Day	(1		)	—
Interest	Dollars	$	3,399		$	3,440
Equity	Shares	2			2

Fair Value of Derivative Instruments

The following table summarizes the fair value within the derivative instrument valuation on the balance sheets:

	Fair Value
	Derivative Assets				Derivative Liabilities
	March 31, 2015		December 31, 2014		March 31, 2015		December 31, 2014
	(In millions)
Derivatives designated as cash flow hedges:
Interest rate contracts current	$	—	$	—	$	51	$	55
Interest rate contracts long-term	—		2		97		74
Commodity contracts current	—		—		—		—
Commodity contracts long-term	—		—		—		—
Total derivatives designated as cash flow hedges	—		2		148		129
Derivatives not designated as cash flow hedges:
Interest rate contracts current	—		—		9		8
Interest rate contracts long-term	—		—		41		28
Commodity contracts current	2,029		2,425		1,824		1,991
Commodity contracts long-term	591		477		512		336
Equity contracts long-term	—		1		—		—
Total derivatives not designated as cash flow hedges	2,620		2,903		2,386		2,363
Total derivatives	$	2,620	$	2,905	$	2,534	$	2,492

The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. In addition, collateral received or paid on the Company's derivative assets or liabilities are recorded on a separate line item on the balance sheet. The following table summarizes the offsetting of derivatives by counterparty master agreement level and collateral received or paid:

	Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted			Net Amount
As of March 31, 2015	(In millions)
Commodity contracts:
Derivative assets	$	2,620		$	(2,092	)	$	(64	)	$	464
Derivative liabilities	(2,336		)	2,092			55			(189		)
Total commodity contracts	284			—			(9		)	275
Interest rate contracts:
Derivative liabilities	(198		)	—			—			(198		)
Total derivative instruments	$	86		$	—		$	(9	)	$	77

	Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets / Liabilities			Derivative Instruments			Cash Collateral (Held) / Posted			Net Amount
As of December 31, 2014	(In millions)
Commodity contracts:
Derivative assets	$	2,902		$	(2,155	)	$	(72	)	$	675
Derivative liabilities	(2,327		)	2,155			27			(145		)
Total commodity contracts	575			—			(45		)	530
Interest rate contracts:
Derivative assets	2			(2		)	—			—
Derivative liabilities	(165		)	2			—			(163		)
Total interest rate contracts	(163		)	—			—			(163		)
Equity contracts:
Derivative assets	1			—			—			1
Total derivative instruments	$	413		$	—		$	(45	)	$	368

Accumulated Other Comprehensive Loss

The following table summarizes the effects of ASC 815 on the Company's accumulated OCI balance attributable to cash flow hedge derivatives, net of tax:

	Three months ended March 31, 2015
	Energy Commodities			Interest Rate			Total
	(In millions)
Accumulated OCI beginning balance	$	(1	)	$	(67	)	$	(68	)
Reclassified from accumulated OCI to income:
Due to realization of previously deferred amounts	—			2			2
Mark-to-market of cash flow hedge accounting contracts	—			(18		)	(18		)
Accumulated OCI ending balance, net of $50 tax	$	(1	)	$	(83	)	$	(84	)
Losses expected to be realized from OCI during the next 12 months, net of $7 tax	$	(1	)	$	(13	)	$	(14	)

	Three months ended March 31, 2014
	Energy Commodities			Interest Rate			Total
	(In millions)
Accumulated OCI beginning balance	$	(1	)	$	(22	)	$	(23	)
Reclassified from accumulated OCI to income:
Due to realization of previously deferred amounts	—			(1		)	(1		)
Mark-to-market of cash flow hedge accounting contracts	—			(8		)	(8		)
Accumulated OCI ending balance, net of $17 tax	$	(1	)	$	(31	)	$	(32	)
Losses expected to be realized from OCI during the next 12 months, net of $7 tax	$	(1	)	$	(13	)	$	(14	)

Amounts reclassified from accumulated OCI into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded to operating revenue for commodity contracts and interest expense for interest rate contracts. There was no ineffectiveness for the three months ended March 31, 2015 and 2014.

Impact of Derivative Instruments on the Statements of Operations

Unrealized gains and losses associated with changes in the fair value of derivative instruments not accounted for as cash flow hedges and ineffectiveness of hedge derivatives are reflected in current period earnings.

The following table summarizes the pre-tax effects of economic hedges that have not been designated as cash flow hedges, ineffectiveness on cash flow hedges and trading activity on the Company's statement of operations. The effect of commodity hedges is included within operating revenues and cost of operations and the effect of interest rate hedges is included in interest expense.

	Three months ended March 31,
	2015			2014
Unrealized mark-to-market results	(In millions)
Reversal of previously recognized unrealized (gains)/losses on settled positions related to economic hedges	$	(114	)	$	3
Reversal of acquired gain positions related to economic hedges	(26		)	(78		)
Net unrealized losses on open positions related to economic hedges	(138		)	(193		)
Total unrealized mark-to-market losses for economic hedging activities	(278		)	(268		)
Reversal of previously recognized unrealized gains on settled positions related to trading activity	(21		)	—
Reversal of acquired gain positions related to trading activity	(7		)	(1		)
Net unrealized gains on open positions related to trading activity	6			16
Total unrealized mark-to-market (losses)/gains for trading activity	(22		)	15
Total unrealized losses	$	(300	)	$	(253	)

	Three months ended March 31,
	2015			2014
	(In millions)
Unrealized losses included in operating revenues	$	(109	)	$	(316	)
Unrealized (losses)/gains included in cost of operations	(191		)	63
Total impact to statement of operations — energy commodities	$	(300	)	$	(253	)
Total impact to statement of operations — interest rate contracts	$	(14	)	$	(4	)

The reversals of acquired gain or loss positions were valued based upon the forward prices on the acquisition date. The roll-off amounts were offset by realized gains or losses at the settled prices and are reflected in revenue or cost of operations during the same period.

For the three months ended March 31, 2015, the $138 million unrealized loss from open economic hedge positions was primarily the result of a decrease in value of forward purchases of coal due to decreases in coal prices.

For the three months ended March 31, 2014, the $193 million unrealized loss from open economic hedge positions was primarily the result of a decrease in value of forward sales of natural gas and electricity due to an increase in forward natural gas and power prices.

Credit Risk Related Contingent Features

Certain of the Company's hedging agreements contain provisions that require the Company to post additional collateral if the counterparty determines that there has been deterioration in credit quality, generally termed “adequate assurance” under the agreements, or requires the Company to post additional collateral if there were a one notch downgrade in the Company's credit rating. The collateral required for contracts with adequate assurance clauses that are in a net liability position as of March 31, 2015, was $131 million. The collateral required for contracts with credit rating contingent features as of March 31, 2015, was $39 million. The Company is also a party to certain marginable agreements where NRG has a net liability position, but the counterparty has not called for the collateral due, which was approximately $8 million as of March 31, 2015.

See Note 4, Fair Value of Financial Instruments, to this Form 10-Q for discussion regarding concentration of credit risk.

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Debt and Capital Leases

3 Months Ended

Mar. 31, 2015

Long Term Debt Disclosure [Abstract]

Debt and Capital Leases

Debt and Capital Leases

This footnote should be read in conjunction with the complete description under Note 12, Debt and Capital Leases, to the Company's 2014 Form 10-K. Long-term debt and capital leases consisted of the following:

(In millions, except rates)	March 31, 2015		December 31, 2014		Current interest rate % (a)
Recourse debt:
Senior notes, due 2018	$	1,130	$	1,130	7.625
Senior notes, due 2020	1,063		1,063		8.250
Senior notes, due 2021	1,128		1,128		7.875
Senior notes, due 2022	1,100		1,100		6.250
Senior notes, due 2023	990		990		6.625
Senior notes, due 2024	1,000		1,000		6.250
Term loan facility, due 2018	1,978		1,983		L+2.00
Tax-exempt bonds	434		406		4.125 - 6.00
Subtotal NRG recourse debt	8,823		8,800
Non-recourse debt:
GenOn senior notes	2,121		2,133		7.875 - 9.875
GenOn Americas Generation senior notes	926		929		8.500 - 9.125
GenOn Other	60		60		various
Subtotal GenOn debt (non-recourse to NRG)	3,107		3,122
NRG Yield Operating LLC Senior Notes, due 2024	500		500		5.375
NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, due 2019	195		—		L+2.25
NRG Yield, Inc. Convertible Senior Notes, due 2019	327		326		3.500
NRG West Holdings LLC, due 2023 (El Segundo Energy Center)	484		506		L+2.25 - L+2.875
NRG Marsh Landing, due 2017 and 2023	457		464		L+1.75 - L+1.875
Alta Wind I - V lease financing arrangements, due 2034 and 2035	1,036		1,036		5.696-7.015
Alta Wind X, due 2021	300		300		L+2.00
Alta Wind XI, due 2021	191		191		L+2.00
Walnut Creek, term loans due 2023	384		391		L+1.625
Tapestry Wind LLC, due 2021	188		192		L+1.625
Laredo Ridge Wind LLC, due 2026	107		108		L+1.875
NRG Solar Alpine LLC, due 2022	162		163		L+1.750
NRG Energy Center Minneapolis LLC, due 2017 and 2025	119		121		5.95 - 7.25
NRG Yield - other	487		489		various
Subtotal NRG Yield debt (non-recourse to NRG)	4,937		4,787
Ivanpah Financing, due 2033 and 2038	1,179		1,187		2.285 - 4.256
Agua Caliente Solar LLC, due 2037	907		898		2.395 - 3.633
CVSR High Plains Ranch II LLC, due 2037	802		815		2.339 - 3.775
Viento Funding II, Inc., due 2023	196		196		L+2.75
NRG Peaker Finance Co. LLC, bonds due 2019	101		100		L+1.07
Cedro Hill Wind LLC, due 2025	108		111		L+3.125
NRG - other	349		350		various
Subtotal NRG non-recourse debt	3,642		3,657
Subtotal non-recourse debt (including GenOn and NRG Yield)	11,686		11,566
Subtotal long-term debt (including current maturities)	20,509		20,366
Capital leases:
Chalk Point capital lease, due 2015	3		5		8.190
Other	3		3		various
Subtotal long-term debt and capital leases (including current maturities)	20,515		20,374
Less current maturities	465		474
Total long-term debt and capital leases	$	20,050	$	19,900

(a) As of March 31, 2015, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan which is 6 month LIBOR plus x% and the NRG West Holdings LLC term loan, NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC Revolving Credit facility which are 1 month LIBOR plus x%.

NRG Recourse Debt

Senior Notes

Issuance of 2022 Senior Notes

On January 27, 2014, NRG issued $1.1 billion in aggregate principal amount at par of 6.25% senior notes due 2022. The notes are senior unsecured obligations of NRG and are guaranteed by certain of its subsidiaries. Interest is payable semi-annually beginning on July 15, 2014, until the maturity date of July 15, 2022. The proceeds were utilized to redeem the 8.5% and 7.625% 2019 Senior Notes, as described below, and to fund the acquisition of EME.

Redemptions of 8.5% and 7.625% 2019 Senior Notes

On February 10, 2014, the Company redeemed $308 million of its 8.5% 2019 Senior Notes and $91 million of its 7.625% 2019 Senior Notes through a tender offer, at an average early redemption percentage of 106.992% and 105.500%, respectively. A $33 million loss on debt extinguishment of the 8.5% and 7.625% 2019 Senior Notes was recorded during the three months ended March 31, 2014, primarily consisting of the premiums paid on the redemption and the write-off of previously deferred financing costs.

NRG Non-Recourse Debt

The Company has non-recourse debt that is secured by acquired or developed projects that are held in several of its subsidiaries.  In the event of a bankruptcy, receivership, liquidation or similar event involving a subsidiary, the assets of such subsidiary would be used to satisfy claims of creditors of the subsidiary, including liabilities under the non-recourse debt associated with such subsidiaries, rather than the creditors of NRG. As described in Note 3, Business Acquisitions and Dispositions, through the Company's acquisitions of EME on April 1, 2014 and Alta Wind on August 12, 2014, the Company acquired approximately $1.2 billion and $1.6 billion of non-recourse debt respectively.

High Lonesome Mesa Facility

Prior to the Company's acquisition of EME, an intercompany tax credit agreement related to the High Lonesome Mesa facility was terminated. The termination resulted in an event of default under the project financing arrangement. As a result, the balance under the project financing arrangement is classified as current and the lender can request repayment at any time. The facility is secured by the assets of High Lonesome Mesa and is non-recourse to NRG.

NRG Yield, Inc. Convertible Notes

During the first quarter of 2014, NRG Yield, Inc. closed on its offering of $345 million aggregate principal amount of 3.50% Convertible Senior Notes due 2019, or the NRG Yield Convertible Notes. The NRG Yield Convertible Notes are convertible, under certain circumstances, into NRG Yield, Inc. Class A common stock, cash or a combination thereof at an initial conversion price of $46.55 per Class A common share, which is equivalent to an initial conversion rate of approximately 21.4822 shares of Class A common stock per $1,000 principal amount of NRG Yield Convertible Notes. Interest on the NRG Yield Convertible Notes is payable semi-annually in arrears on February 1 and August 1 of each year, commencing on August 1, 2014. The NRG Yield Convertible Notes mature on February 1, 2019, unless earlier repurchased or converted in accordance with their terms. Prior to the close of business on the business day immediately preceding August 1, 2018, the NRG Yield Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. The notes are accounted for in accordance with ASC 470-20. Under ASC 470-20, issuers of convertible debt instruments that may be settled in cash upon conversion, including partial cash settlement, are required to separately account for the liability (debt) and equity (conversion option) components. The equity component, the $23 million conversion option value, was recorded to NRG's noncontrolling interest for NRG Yield, Inc. with the offset to debt discount. The debt discount will be amortized to interest expense over the term of the notes.

NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility

NRG Yield LLC and Yield Operating entered into a senior secured revolving credit facility, which provides a revolving line of credit of $60 million. On April 25, 2014, NRG Yield LLC and Yield Operating amended the revolving credit facility to increase the available line of credit to $450 million and extend its maturity to April 2019. The revolving credit facility can be used for cash or for the issuance of letters of credit. On January 2, 2015, NRG Yield borrowed $210 million under the revolving credit facility to fund the acquisition of Walnut Creek, Laredo Ridge and the Tapestry projects. On February 2, 2015, NRG Yield made an optional repayment of $15 million of principal. In addition, there were $36 million of letters of credit issued under the revolving credit facility as of March 31, 2015.

Peakers

On February 21, 2014, NRG Peaker Finance Company LLC elected to redeem approximately $30 million of the outstanding bonds at a redemption price equal to the principal amount plus a redemption premium, accrued and unpaid interest, swap breakage, and other fees, totaling approximately $35 million in connection with the removal of Bayou Cove Peaking Power LLC from the peaker financing collateral package, which also involved limited commitments for certain repairs on other assets that were funded concurrently with the December 10, 2013, debt service payment. On March 3, 2014, Bayou Cove Peaking Power LLC sold Bayou Cove Unit 1, which the Company continues to manage and operate.

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Changes in Capital Structure

3 Months Ended

Mar. 31, 2015

Changes in Capital Structure Disclosure [Abstract]

Changes in Capital Structure

Changes in Capital Structure

As of March 31, 2015, and December 31, 2014, the Company had 500,000,000 shares of common stock authorized. The following table reflects the changes in NRG's common stock issued and outstanding:

	Issued	Treasury		Outstanding
Balance as of December 31, 2014	415,506,176	(78,843,552	)	336,662,624
Shares issued under LTIPs	1,176,486	—		1,176,486
Shares issued under ESPP	—	124,625		124,625
Shares repurchased under Capital Allocation Program	—	(3,146,484	)	(3,146,484	)
Balance as of March 31, 2015	416,682,662	(81,865,411	)	334,817,251

Employee Stock Purchase Plan

As of March 31, 2015, there were 1,435,427 shares of treasury stock available for issuance under the ESPP.

NRG Common Stock Dividends

The following table lists the dividends paid during the three months ended March 31, 2015:

	First Quarter 2015
Dividends per Common Share	$	0.145

On April 20, 2015, NRG declared a quarterly dividend on the Company's common stock of $0.145 per share, payable May 15, 2015, to stockholders of record as of May 1, 2015, representing $0.58 on an annualized basis.

The Company's common stock dividends are subject to available capital, market conditions, and compliance with associated laws, regulations and other contractual obligations.

2015 Capital Allocation Program

In December 2014, the Company was authorized to repurchase $100 million of its common stock under the 2015 Capital Allocation Program. In March 2015, the Company was authorized to repurchase an additional $100 million of its common stock under the 2015 Capital Allocation Program, for a total share repurchase of $200 million. In addition, in the second quarter of 2015, the Company's board of directors authorized the repurchase of an additional $81 million of the Company's common stock.

The following table reflects the repurchases made under the 2015 Capital Allocation Program:

	Total number of shares purchased	Average price paid per share (a)		Amounts paid for shares purchased (in millions) (a)
2015 Capital Allocation Program
December 2014	1,624,360	$	26.95	$	44
January 2015	1,755,976	25.19		44
February 2015	468,854	25.46		12
March 2015	921,654	24.92		23
Total Repurchases - First Quarter 2015	3,146,484			79
April 2015	1,328,329	24.47		33
Total Repurchases under 2015 Capital Allocation Program	6,099,173	—		$	156

(a) The average price paid per share and amounts paid for shares purchased excludes the commissions of $0.015 per share paid in connection with the share repurchase.

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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Dec. 31, 2014
Numerator:
Net Loss Attributable to NRG Energy, Inc.	$ (120)		$ (56)
Dividends for preferred shares	5		2
Loss available for common stockholders	$ (125)		$ (58)
Denominator:
Weighted average number of common shares outstanding - basic and diluted	336		324
Basic earnings per share:
Loss per weighted average common share — basic and diluted	$ (0.37)		$ (0.18)
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of diluted earnings per share, amount	23		24
3.625% convertible perpetual preferred stock, interest rate (as a percentage)	2.822%		3.625%		2.822%
Equity compensation plans
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of diluted earnings per share, amount	7		8
Embedded derivative of 3.625% redeemable perpetual preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded from computation of diluted earnings per share, amount	16	[1]	16	[1]

[1] As of March 31, 2014, the redeemable perpetual preferred stock had an interest rate of 3.625%.

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Valuation Allowance [Line Items]
Non-current tax liability for uncertain tax benefits	$ 55
Effective Tax Rate
Loss before income taxes	(209)	(98)
Income tax benefit	(73)	(31)
Effective tax rate (as a percent)	34.90%	31.60%
Statutory tax rate (as a percent)	35.00%	35.00%
Uncertain Tax Benefits
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 6

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Changes in Capital Structure (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended						3 Months Ended					5 Months Ended		1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2015		Feb. 28, 2015		Jan. 31, 2015		Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Apr. 30, 2015		Apr. 30, 2015		Jun. 30, 2015	Dec. 31, 2015	Mar. 16, 2015	Dec. 09, 2014
Employee Stock Purchase Plan and 2013 Capital Allocation Plan
Payments for Commissions							$ 0.015
Dividend paid							$ 0.15				$ 0.12
Stock Repurchase Program, Authorized Amount	$ 200						$ 200											$ 100	$ 100
Stock Repurchased During Period, Shares	921,654		468,854		1,755,976		3,146,484		1,624,360			6,099,173
Stock Repurchased During Period, Value	23	[1]	12	[1]	44	[1]	79	[1]	44	[1]		156	[1]
Treasury Stock Acquired, Average Cost Per Share	$ 24.92	[1]	$ 25.46	[1]	$ 25.19	[1]			$ 26.95	[1]
Subsequent Event [Member]
Employee Stock Purchase Plan and 2013 Capital Allocation Plan
Dividends Payable, Date Declared																Apr. 20, 2015
Dividend declared																$ 0.15
Dividends Payable, Date to be Paid																May 15, 2015
Stock Repurchased During Period, Shares														1,328,329
Stock Repurchased During Period, Value														$ 33	[1]
Treasury Stock Acquired, Average Cost Per Share														$ 24.47	[1]
Scenario, Plan [Member] | Subsequent Event [Member]
Employee Stock Purchase Plan and 2013 Capital Allocation Plan
NRG's annual common stock dividend, proposed amount for 2013																	$ 0.58

[1] The average price paid per share and amounts paid for shares purchased excludes the commissions of $0.015 per share paid in connection with the share repurchase.

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2015

Segment Reporting Disclosure [Abstract]

Schedule of segment reporting information, by segment

				NRG Home
(In millions)	NRG Business(a)			Retail(a)		Solar(a)			NRG Renew(a)			NRG Yield(a)			Corporate(a)			Eliminations			Total
Three months ended March 31, 2015	(in millions)
Operating revenues(a)	$	2,506		$	1,311	$	5		$	110		$	180		$	(7	)	$	(279	)	$	3,826
Depreciation and amortization	233			30		6			65			54			7			—			395
Equity in (loss)/earnings of unconsolidated affiliates	(4		)	—		—			—			1			(1		)	1			(3		)
Income/(loss) before income taxes	29			104		(45		)	(61		)	(20		)	(217		)	1			(209		)
Net income/(loss) attributable to NRG Energy, Inc.	$	29		$	104	$	(45	)	$	(50	)	$	(11	)	$	(142	)	$	(5	)	(120		)
Total assets as of March 31, 2015	$	28,744		$	6,270	$	178		$	7,155		$	6,595		$	31,493		$	(40,105	)	$	40,330

(a) Operating revenues include inter-segment sales and net derivative gains and losses of: $ 246 $ — $ — $ — $ — $ 33 $ — $ 279

				NRG Home
(In millions)	NRG Business(b)			Retail(b)		Solar(b)			NRG Renew(b)(c)			NRG Yield(b)		Corporate(b)(c)			Eliminations			Total
Three months ended March 31, 2014	(in millions)
Operating revenues(b)	$	2,346		$	1,082	$	2		$	53		$	140	$	4		$	(141	)	$	3,486
Depreciation and amortization	225			30		1			49			24		6			—			335
Equity in earnings/(loss) of unconsolidated affiliates	5			—		—			(3		)	1		2			2			7
(Loss)/income before income taxes	(6		)	185		(2		)	(65		)	29		(239		)	—			(98		)
Net (loss)/income attributable to NRG Energy, Inc.	$	(6	)	$	185	$	(2	)	$	(48	)	$	22	$	(209	)	$	2		(56		)

(b) Operating revenues include inter-segment sales and net derivative gains and losses of: $ 113 $ 2 $ — $ — $ — $ 26 $ — $ 141

(c) Includes loss on debt extinguishment of: $ — $ — $ — $ (1 ) $ — $ (40 ) $ — $ (41 )

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Fair Value of Financial Instruments (Details 4) (USD $)	3 Months Ended
	Mar. 31, 2015
Concentration of Credit Risk
Total derivative assets valued with prices provied by models and other valuation techniques (as a percent)	10.00%
Total derivative liabilities valued with prices provied by models and other valuation techniques (as a percent)	9.00%
Valuation Allowances and Reserves, Balance	$ 5,000,000
Increase in fair value as a result of the credit reserve, portion recorded in OCI	(3,000,000)
Increase in fair value as a result of the credit reserve, portion recorded in operating revenue and cost of operations	(2,000,000)
Counterparty credit exposure to a portion of the Company's counterparties	842,000,000
Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties	84,000,000
Net counterparty credit exposure to a portion of the Company's counterparties	763,000,000
Company's exposure before collateral is expected to roll off by the end of 2014 (as a percent)	91.00%
Net Exposure (as a percent)	100.00%	[1]
Counterparty credit risk exposure to certain counterparties, threshold (as a percent)	10.00%
Aggregate counterparty credit risk exposure for counterparties representing exposure above threshold percentage	290,000,000
Estimated counterparty credit risk exposure under certain long term agreements, including California tolling agreements, South Central load obligations and solar power purchase agreements for the next 5 years	3,300,000,000
Period of estimated counterparty credit risk exposure under certain long term agreements, including California tolling agreements, South Central load obligations and solar power purchase agreements (in years)	5 years
Investment grade
Concentration of Credit Risk
Net Exposure (as a percent)	96.00%	[1]
Non-rated
Concentration of Credit Risk
Net Exposure (as a percent)	2.00%	[1],[2]
External Credit Rating, Non Investment Grade [Member]
Concentration of Credit Risk
Net Exposure (as a percent)	2.00%	[1]
Financial institutions
Concentration of Credit Risk
Net Exposure (as a percent)	48.00%	[1]
Utilities, energy merchants, marketers and other
Concentration of Credit Risk
Net Exposure (as a percent)	32.00%	[1]
ISOs
Concentration of Credit Risk
Net Exposure (as a percent)	20.00%	[1]
NRG Yield, Inc.
Concentration of Credit Risk
Estimated counterparty credit risk exposure under certain long term agreements, including California tolling agreements, South Central load obligations and solar power purchase agreements for the next 5 years	$ 2,300,000,000

[1] Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices.

[2] For non-rated counterparties, a significant portion are related to ISO and municipal public power entities, which are considered investment grade equivalent ratings based on NRG's internal credit ratings.

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Regulatory Matters

3 Months Ended

Mar. 31, 2015

Regulatory Matters Disclosure [Abstract]

Regulatory Matters

Regulatory Matters

This footnote should be read in conjunction with the complete description under Note 23, Regulatory Matters, to the Company's 2014 Form 10-K.

NRG operates in a highly regulated industry and is subject to regulation by various federal and state agencies. As such, NRG is affected by regulatory developments at both the federal and state levels and in the regions in which NRG operates. In addition, NRG is subject to the market rules, procedures, and protocols of the various ISO and RTO markets in which NRG participates. These power markets are subject to ongoing legislative and regulatory changes that may impact NRG's wholesale and retail businesses.

In addition to the regulatory proceedings noted below, NRG and its subsidiaries are a party to other regulatory proceedings arising in the ordinary course of business or have other regulatory exposure. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows.

National

Court Rejects FERC's Jurisdiction Over Demand Response — On May 23, 2014, the U.S. Court of Appeals for the District of Columbia Circuit vacated FERC’s rules (known as Order No. 745) that allowed demand response resources to participate in FERC-jurisdictional energy markets. The Court of Appeals held that the Federal Power Act does not authorize FERC to exercise jurisdiction over demand response and that instead demand response is part of the retail market over which the states have jurisdiction. The specific order being challenged related to energy market compensation, but this ruling also calls into question whether demand response will be permitted to participate in the capacity markets in the future. Parties including the U.S. Solicitor General have filed petitions for a writ of certiorari with the U.S. Supreme Court. On May 4, 2015, the U.S. Supreme Court granted certiorari on two questions: first, on whether the FPA gives FERC jurisdiction over demand response, and second, whether FERC’s Order No. 745 correctly determined the level of compensation paid to generators participating in the energy markets. The eventual outcome of this proceeding could result in refunds of payments made for non-jurisdictional services and resettlement of wholesale markets, but it is not possible to predict the outcome or estimate the impact on the Company at this time.

East Region

Montgomery County Station Power Tax—On December 20, 2013, the Company received a letter from Montgomery County, Maryland requesting payment of an energy tax for the consumption of station power at the Dickerson Facility over the previous three years.  Montgomery County seeks payment in the amount of $22 million, which includes tax, interest and penalties.  The Company is disputing the applicability of the tax. On December 17, 2014, the Maryland Tax Court heard oral arguments from the parties. Subsequently, post hearing briefs were filed. The decision is pending.

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Business Acquisitions and Dispositions (Tables)

3 Months Ended

Mar. 31, 2015

EME [Member]

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The purchase price of $3.5 billion was allocated as follows:

	Acquisition Date Fair Value at December 31, 2014		Measurement period adjustments			Revised Acquisition Date
	(In millions)
Assets
Cash	$	1,422	$	—		$	1,422
Current assets	724		72			796
Property, plant and equipment	2,438		(3		)	2,435
Intangible assets	172		—			172
Goodwill	334		(56		)	278
Non-current assets	773		—			773
Total assets acquired	5,863		13			5,876
Liabilities
Current and non-current liabilities	629		13			642
Out-of-market contracts and leases	159		—			159
Long-term debt	1,249		—			1,249
Total liabilities assumed	2,037		13			2,050
Less: noncontrolling interest	352		—			352
Net assets acquired	$	3,474	$	—		$	3,474

Alta Wind Holdings [Member]

Business Acquisition [Line Items]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]

The following table summarizes the provisional amounts recognized for assets acquired and liabilities assumed as of December 31, 2014, as well as adjustments made through March 31, 2015. The purchase price of $923 million was provisionally allocated as follows:

	Acquisition Date Fair Value at December 31, 2014		Measurement period adjustments			Revised Acquisition Date
	(In millions)
Assets
Cash	$	22	$	—		$	22
Current and non-current assets	49		(2		)	47
Property, plant and equipment	1,304		6			1,310
Intangible assets	1,177		(6		)	1,171
Total assets acquired	2,552		(2		)	2,550
Liabilities
Debt	1,591		—			1,591
Current and non-current liabilities	38		(2		)	36
Total liabilities assumed	1,629		(2		)	1,627
Net assets acquired	$	923	$	—		$	923

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Fair Value of Financial Instruments (Details 2 - Recurring FV) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets	$ 2,620		$ 2,905
Derivative Liabilities	2,534		2,492
Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets	2,620		2,902
Derivative Liabilities	2,336		2,327
Interest rate contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			2
Derivative Liabilities	(198)		165
Equity Contract [Member]
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			1
Fair Value | Fair Value, Measurements, Recurring
Fair Value Assets and Liabilities, Measured on Recurring Basis
Debt securities	18		18
Available-for-sale Securities	24		30
Other	31	[1]	32	[2]
Total assets	3,280		3,571
Total liabilities	2,534		2,492
Fair Value | Fair Value, Measurements, Recurring | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets	2,620		2,902
Derivative Liabilities	2,336		2,327
Fair Value | Fair Value, Measurements, Recurring | Interest rate contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			2
Derivative Liabilities	198		165
Fair Value | Fair Value, Measurements, Recurring | Equity Contract [Member]
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			1
Fair Value | Fair Value, Measurements, Recurring | Cash and cash equivalents
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	5		14
Fair Value | Fair Value, Measurements, Recurring | U.S. government and federal agency obligations
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	53		47
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	1		1
Fair Value | Fair Value, Measurements, Recurring | Federal agency mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	71		74
Fair Value | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	24		25
Fair Value | Fair Value, Measurements, Recurring | Corporate debt securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	84		78
Fair Value | Fair Value, Measurements, Recurring | Equity securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	347		344
Fair Value | Fair Value, Measurements, Recurring | Foreign government fixed income securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	2		3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring
Fair Value Assets and Liabilities, Measured on Recurring Basis
Debt securities	18		18
Available-for-sale Securities	0		0
Other	11	[1]	11	[2]
Total assets	347		391
Total liabilities	230		230
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets	264		309
Derivative Liabilities	230		230
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Interest rate contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			0
Derivative Liabilities	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Equity Contract [Member]
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			1
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Cash and cash equivalents
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | U.S. government and federal agency obligations
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Federal agency mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Corporate debt securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Equity securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	54		52
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring | Foreign government fixed income securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring
Fair Value Assets and Liabilities, Measured on Recurring Basis
Debt securities	0		0
Available-for-sale Securities	0		0
Other	0	[1]	0	[2]
Total assets	1,542		1,700
Total liabilities	1,340		1,258
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets	1,358		1,515
Derivative Liabilities	1,142		1,093
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Interest rate contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			2
Derivative Liabilities	198		165
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Equity Contract [Member]
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Cash and cash equivalents
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | U.S. government and federal agency obligations
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	3		3
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Federal agency mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	71		74
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	24		25
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Corporate debt securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	84		78
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Equity securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring | Foreign government fixed income securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	2		3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring
Fair Value Assets and Liabilities, Measured on Recurring Basis
Debt securities	0		0
Available-for-sale Securities	24		30
Other	20	[1]	21	[2]
Total assets	1,391		1,480
Total liabilities	964		1,004
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Commodity contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets	998		1,078
Derivative Liabilities	964		1,004
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Interest rate contracts
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			0
Derivative Liabilities	0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Equity Contract [Member]
Fair Value Assets and Liabilities, Measured on Recurring Basis
Derivative Assets			0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Cash and cash equivalents
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	5		14
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | U.S. government and federal agency obligations
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	50		44
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	1		1
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Federal agency mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Commercial mortgage-backed securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Corporate debt securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	0		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Equity securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	293		292
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring | Foreign government fixed income securities
Fair Value Assets and Liabilities, Measured on Recurring Basis
Decommissioning Fund Investments	$ 0		$ 0

[1] Consists primarily of mutual funds held in a Rabbi Trust for non-qualified deferred compensation plans for certain former employees and a total return swap that does not meet the definition of a derivative.

[2] Primarily consists of mutual funds held in rabbi trusts for non-qualified deferred compensation plans for certain former employees.

XML

Business Acquisitions and Dispositions Business Acquisitions and Dispositions (Details 2 - Sabine) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 03, 2014	Dec. 31, 2014	Mar. 31, 2015 MW	Dec. 02, 2014 MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Power Generation Capacity, Megawatts			51,000
Sabine CoGen, LP [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of Ownership Sold of Subsidiary				50.00%
Power Generation Capacity, Megawatts				105
Proceeds from Sale of Equity Method Investments	$ 35
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 18

XML

Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 2,164	$ 2,116
Funds deposited by counterparties	68	72
Restricted cash	443	457
Accounts receivable — trade, less allowance for doubtful accounts of $21 and $23	1,179	1,322
Inventory	1,109	1,247
Derivative instruments	2,029	2,425
Cash collateral paid in support of energy risk management activities	400	187
Deferred income taxes	188	174
Renewable energy grant receivable, net	68	135
Prepayments and other current assets	474	447
Total current assets	8,122	8,582
Property, plant and equipment, net of accumulated depreciation of $8,264 and $7,890	22,276	22,367
Other Assets
Equity investments in affiliates	772	771
Notes receivable, less current portion	67	72
Goodwill	2,520	2,574
Intangible assets, net of accumulated amortization of $1,511 and $1,402	2,491	2,567
Nuclear decommissioning trust fund	586	585
Derivative instruments	591	480
Deferred income taxes	1,484	1,406
Non-current assets held-for-sale	17	17
Other non-current assets	1,404	1,244
Total other assets	9,932	9,716
Total Assets	40,330	40,665
Current Liabilities
Current portion of long-term debt and capital leases	465	474
Accounts payable	1,045	1,060
Derivative instruments	1,884	2,054
Cash collateral received in support of energy risk management activities	68	72
Accrued expenses and other current liabilities	1,047	1,199
Total current liabilities	4,509	4,859
Other Liabilities
Long-term debt and capital leases	20,050	19,900
Nuclear decommissioning reserve	314	310
Nuclear decommissioning trust liability	328	333
Deferred income taxes	20	21
Derivative instruments	650	438
Out-of-market contracts, net of accumulated amortization of $585 and $562	1,221	1,244
Other non-current liabilities	1,549	1,574
Total non-current liabilities	24,132	23,820
Total Liabilities	28,641	28,679
2.822% convertible perpetual preferred stock	293	291
Redeemable Noncontrolling Interest, Equity, Other, Carrying Amount	19	19
Stockholders’ Equity
Common stock	4	4
Additional paid-in capital	8,362	8,327
Retained earnings	3,413	3,588
Less treasury stock, at cost — 81,865,411 and 78,843,552 shares, respectively	(2,059)	(1,983)
Accumulated other comprehensive loss	(191)	(174)
Noncontrolling interest	1,848	1,914
Total Stockholders’ Equity	11,377	11,676
Total Liabilities and Stockholders’ Equity	$ 40,330	$ 40,665

XML

Business Acquisitions and Dispositions

3 Months Ended

Mar. 31, 2015

Business Combinations [Abstract]

Mergers, Acquisitions and Dispositions Disclosures [Text Block]

Business Acquisitions and Dispositions

The Company has completed the following business acquisitions and dispositions that are material to the Company's financial statements:

2015 Dispositions

Sale of Assets to NRG Yield, Inc.

On January 2, 2015, the Company sold the following facilities to NRG Yield, Inc.: Walnut Creek, the Tapestry projects (Buffalo Bear, Pinnacle and Taloga) and Laredo Ridge. NRG Yield, Inc. paid total cash consideration of $489 million, including $9 million of working capital adjustments, plus assumed project level debt of $737 million. The sale was recorded as a transfer of entities under common control and the related assets were transferred at carrying value of $405 million.

2014 Acquisitions and Dispositions

Sale of Sabine

On December 2, 2014, the Company, through its subsidiaries GenOn Sabine (Delaware), Inc. and GenOn Sabine (Texas), Inc., completed the sale of its 50% interest in Sabine to Bayou Power, LLC, an affiliate of Rockland Capital, LLC. Sabine owns a 105 MW natural gas-fired cogeneration facility located in Texas. The Company received cash consideration of $35 million at closing. A gain of $18 million was recognized as a result of the transaction and recorded as a gain on sale of equity-method investments within the Company's consolidated statements of operations.

Acquisition of Alta Wind

On August 12, 2014, NRG Yield, Inc., through its subsidiary Yield Operating, completed the acquisition of 100% of the membership interests of Alta Wind Asset Management Holdings, LLC, Alta Wind Company, LLC, Alta Wind X Holding Company, LLC, and Alta Wind XI Holding Company, LLC, which collectively own seven wind facilities that total 947 MWs located in Tehachapi, California and a portfolio of land leases, or the Alta Wind Assets. Power generated by the Alta Wind facilities is sold to Southern California Edison under long-term power purchase agreements, with 21 years of remaining contract life for Alta I-V. The Alta X and XI power purchase agreements begin in 2016 with a term of 22 years and currently sell energy and renewable energy credits on a merchant basis.

The purchase price of the Alta Wind Assets was $923 million, which was comprised of purchase price of $870 million and $53 million paid for working capital balances. In order to fund the purchase price of the acquisition, NRG Yield, Inc. issued 12,075,000 shares of its Class A common stock on July 29, 2014, for net proceeds of $630 million. In addition, on August 5, 2014, Yield Operating issued $500 million in aggregate principal amount at par of 5.375% senior notes due August 2024. Interest on the notes is payable semi-annually on February 15 and August 15 of each year, and commenced on February 15, 2015. The notes are senior unsecured obligations of Yield Operating and are guaranteed by NRG Yield LLC, Yield Operating’s parent company, and by certain of Yield Operating’s wholly owned subsidiaries.

The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The initial accounting for the business combination is not complete because the evaluation necessary to assess the fair values of certain net assets acquired is still in process. The provisional amounts are subject to revision until the evaluations are completed to the extent that additional information is obtained about the facts and circumstances that existed as of the acquisition date. The allocation of the purchase price may be modified up to one year from the date of the acquisition as more information is obtained about the fair value of assets acquired and liabilities assumed. The following table summarizes the provisional amounts recognized for assets acquired and liabilities assumed as of December 31, 2014, as well as adjustments made through March 31, 2015. The purchase price of $923 million was provisionally allocated as follows:

	Acquisition Date Fair Value at December 31, 2014		Measurement period adjustments			Revised Acquisition Date
	(In millions)
Assets
Cash	$	22	$	—		$	22
Current and non-current assets	49		(2		)	47
Property, plant and equipment	1,304		6			1,310
Intangible assets	1,177		(6		)	1,171
Total assets acquired	2,552		(2		)	2,550
Liabilities
Debt	1,591		—			1,591
Current and non-current liabilities	38		(2		)	36
Total liabilities assumed	1,629		(2		)	1,627
Net assets acquired	$	923	$	—		$	923

Disposition of 50% Interest in Petra Nova Parish Holdings LLC

On July 3, 2014, the Company, through its wholly owned subsidiary Petra Nova Holdings LLC, sold 50% of its interest in Petra Nova Parish Holdings LLC to JX Nippon Oil Exploration (EOR) Limited, JX Nippon, a wholly owned subsidiary of JX Nippon Oil & Gas Exploration Corporation.  As a result of the sale, the Company no longer has a controlling interest in and has deconsolidated Petra Nova Parish Holdings LLC as of the date of the sale. On July 7, 2014, the Company made its initial capital contribution into the partnership of $35 million, which was funded with a portion of the sale proceeds of $76 million. On March 3, 2014, Petra Nova CCS I LLC, a wholly owned subsidiary of Petra Nova Parish Holdings LLC, entered into a fixed-price agreement to build and operate a CCF at the W.A. Parish facility with a consortium of Mitsubishi Heavy Industries America, Inc. and TIC - The Industrial Company.  Notice to proceed for the construction on the CCF was issued on July 15, 2014, and commercial operation is expected in late 2016. 

Petra Nova Parish Holdings LLC also owns a 75 MW peaking unit at W.A. Parish, which achieved commercial operations on June 26, 2013. The peaking unit will be converted into a cogeneration facility to provide power and steam to the CCF.  The project is being financed by: (i) up to $167 million from a U.S. DOE CCPI grant, (ii) $250 million in loans provided by the Japan Bank for International Cooperation and Mizuho Bank, Ltd., and (iii) approximately $300 million in equity contributions from each of the Company and JX Nippon. NRG’s contribution will include investments already made during the development of the project. 

Sale of Assets to NRG Yield, Inc.

On June 30, 2014, the Company sold the following facilities to NRG Yield, Inc.: High Desert, Kansas South, and El Segundo Energy Center. NRG Yield, Inc. paid total cash consideration of $357 million, which represents a base purchase price of $349 million and $8 million of working capital adjustments, plus assumed project level debt of approximately $612 million. The sale was recorded as a transfer of entities under common control and the related assets were transferred at carrying value of $236 million.

Acquisition of Dominion's Competitive Electric Retail Business

On March 31, 2014, the Company acquired the competitive retail electricity business of Dominion. The acquisition of Dominion's competitive retail electricity business increased NRG’s retail portfolio by approximately 540,000 customers in the aggregate by the end of 2014. The acquisition supports NRG's ongoing efforts to expand the Company's retail footprint in the Northeast and to grow its retail position in Texas. The Company paid approximately $192 million as cash consideration for the acquisition, including $165 million of purchase price and $27 million paid for working capital balances, which was funded by cash on hand. The purchase price was allocated to the following: $40 million to accounts receivable-trade, $64 million to customer relationships, $9 million to trade names, $14 million to current assets, $21 million to derivative assets, $47 million to current and non-current liabilities, and goodwill of $91 million of which $8 million is deductible for U.S. income tax purposes in future periods. The factors that resulted in goodwill arising from the acquisition include the revenues associated with new customers in new regions and through the synergies associated with combining a new retail business with the Company's existing retail and generation assets. The assets acquired and liabilities assumed are included within the NRG Home Retail segment. The accounting for the Dominion acquisition was completed as of March 30, 2015, at which point the provisional fair values became final with no material changes.

EME Acquisition

On April 1, 2014, the Company acquired substantially all of the assets of EME.  EME, through its subsidiaries and affiliates, owned or leased and operated a portfolio of approximately 8,000 MW consisting of wind energy facilities and coal- and gas-fired generating facilities. The Company paid an aggregate purchase price of $3.5 billion, which was funded through the issuance of 12,671,977shares of NRG common stock on April 1, 2014, the issuance of $700 million in newly-issued corporate debt and cash on hand. The Company also assumed non-recourse debt of approximately $1.2 billion. 

In connection with the transaction, NRG agreed to certain conditions with the parties to the POJO sale-leaseback transaction subject to which an NRG subsidiary assumed the POJO leveraged leases and NRG guaranteed the remaining payments under each lease, which total $405 million through 2034. In connection with this agreement, NRG has committed to fund up to $350 million in capital expenditures for plant modifications at Powerton and Joliet to comply with environmental regulations, as discussed further in Note 15, Environmental Matters.

The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The accounting for the EME acquisition was completed as of March 31, 2015, at which point the fair values became final. The following table summarizes the provisional amounts recognized for assets acquired and liabilities assumed as of December 31, 2014, as well as adjustments made through March 31, 2015, when the allocation became final. Measurement period adjustments primarily reflect the tax impact of the acquisition date fair values and final estimates for asset retirement obligations. The purchase price of $3.5 billion was allocated as follows:

	Acquisition Date Fair Value at December 31, 2014		Measurement period adjustments			Revised Acquisition Date
	(In millions)
Assets
Cash	$	1,422	$	—		$	1,422
Current assets	724		72			796
Property, plant and equipment	2,438		(3		)	2,435
Intangible assets	172		—			172
Goodwill	334		(56		)	278
Non-current assets	773		—			773
Total assets acquired	5,863		13			5,876
Liabilities
Current and non-current liabilities	629		13			642
Out-of-market contracts and leases	159		—			159
Long-term debt	1,249		—			1,249
Total liabilities assumed	2,037		13			2,050
Less: noncontrolling interest	352		—			352
Net assets acquired	$	3,474	$	—		$	3,474

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Debt and Capital Leases Debt and Capital Leases (Details 2 - Issuances) (Recourse Debt, USD $) In Billions, unless otherwise specified	0 Months Ended
	Jan. 27, 2014	Mar. 31, 2015
Senior Notes 2024 [Member]
Debt and Capital Leases
Debt Instrument, Interest Rate, Stated Percentage		6.25%	[1]
Senior Notes Due In 2022 [Member]
Debt and Capital Leases
Proceeds from Issuance of Senior Long-term Debt	$ 1.1
Debt Instrument, Interest Rate, Stated Percentage	6.25%	6.25%	[1]
Senior Notes Due In 2019 7625 [Member]
Debt and Capital Leases
Debt Instrument, Interest Rate, Stated Percentage		7.625%
Senior Notes Due In 2019 850 [Member]
Debt and Capital Leases
Debt Instrument, Interest Rate, Stated Percentage		8.50%

[1] As of March 31, 2015, L+ equals 3 month LIBOR plus x%, with the exception of the Viento Funding II term loan which is 6 month LIBOR plus x% and the NRG West Holdings LLC term loan, NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield Operating LLC Revolving Credit facility which are 1 month LIBOR plus x%.

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Environmental Matters (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Environmental capital expenditures [Line Items]
Environmental Capital Expenditures, Estimated	$ 614
Genon [Member]
Environmental capital expenditures [Line Items]
Environmental Capital Expenditures, Estimated	57
Midwest Generation [Member]
Environmental capital expenditures [Line Items]
Environmental Capital Expenditures, Estimated	440
EME [Member]
Environmental capital expenditures [Line Items]
Environmental Capital Expenditures, Estimated Total		$ 350

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value of Financial Instruments Disclosure [Abstract]

Estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value

The estimated carrying amounts and fair values of NRG's recorded financial instruments not carried at fair market value are as follows:

	As of March 31, 2015				As of December 31, 2014
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
	(In millions)
Assets:
Notes receivable (a)	$	86	$	86	$	91	$	91
Liabilities:
Long-term debt, including current portion	$	20,509	$	20,679	$	20,366	$	20,361

(a) Includes the current portion of notes receivable which is recorded in prepayments and other current assets on the Company's consolidated balance sheets.

Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis

The following tables present assets and liabilities measured and recorded at fair value on the Company's condensed consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:

	As of March 31, 2015
	Fair Value
(In millions)	Level 1		Level 2		Level 3		Total
Investment in available-for-sale securities (classified within other     non-current assets):
Debt securities	$	—	$	—	$	18	$	18
Available-for-sale securities	24		—		—		24
Other (a)	20		—		11		31
Nuclear trust fund investments:
Cash and cash equivalents	5		—		—		5
U.S. government and federal agency obligations	50		3		—		53
Federal agency mortgage-backed securities	—		71		—		71
Commercial mortgage-backed securities	—		24		—		24
Corporate debt securities	—		84		—		84
Equity securities	293		—		54		347
Foreign government fixed income securities	—		2		—		2
Other trust fund investments:
U.S. government and federal agency obligations	1		—		—		1
Derivative assets:
Commodity contracts	998		1,358		264		2,620
Total assets	$	1,391	$	1,542	$	347	$	3,280
Derivative liabilities:
Commodity contracts	$	964	$	1,142	$	230	$	2,336
Interest rate contracts	—		198		—		198
Total liabilities	$	964	$	1,340	$	230	$	2,534

(a) Consists primarily of mutual funds held in a Rabbi Trust for non-qualified deferred compensation plans for certain former employees and a total return swap that does not meet the definition of a derivative.

	As of December 31, 2014
	Fair Value
(In millions)	Level 1		Level 2		Level 3		Total
Investment in available-for-sale securities (classified within other non-current assets):
Debt securities	$	—	$	—	$	18	$	18
Available-for-sale securities	30		—		—		30
Other (a)	21		—		11		32
Nuclear trust fund investments:
Cash and cash equivalents	14		—		—		14
U.S. government and federal agency obligations	44		3		—		47
Federal agency mortgage-backed securities	—		74		—		74
Commercial mortgage-backed securities	—		25		—		25
Corporate debt securities	—		78		—		78
Equity securities	292		—		52		344
Foreign government fixed income securities	—		3		—		3
Other trust fund investments:
U.S. government and federal agency obligations	1		—		—		1
Derivative assets:
Commodity contracts	1,078		1,515		309		2,902
Interest rate contracts	—		2		—		2
Equity contracts	—		—		1		1
Total assets	$	1,480	$	1,700	$	391	$	3,571
Derivative liabilities:
Commodity contracts	$	1,004	$	1,093	$	230	$	2,327
Interest rate contracts	—		165		—		165
Total liabilities	$	1,004	$	1,258	$	230	$	2,492

(a) Primarily consists of mutual funds held in rabbi trusts for non-qualified deferred compensation plans for certain former employees.

Reconciliation of beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements at least annually using significant unobservable inputs

The following tables reconcile, for the three months ended March 31, 2015, and 2014, the beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended March 31, 2015
(In millions)	Debt Securities		Other		Trust Fund Investments		Derivatives(a)			Total
Beginning balance	$	18	$	11	$	52	$	80		$	161
Total gains/(losses) — realized/unrealized:
Included in earnings	—		—		—		(55		)	(55		)
Included in nuclear decommissioning obligation	—		—		2		—			2
Purchases	—		—		—		(4		)	(4		)
Transfers into Level 3 (b)	—		—		—		15			15
Transfers out of Level 3 (b)	—		—		—		(2		)	(2		)
Ending balance as of March 31, 2015	$	18	$	11	$	54	$	34		$	117
Losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2015	$	—	$	—	$	—	(20		)	$	(20	)

(a) Consists of derivative assets and liabilities, net.

(b) Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

	Fair Value Measurement Using Significant Unobservable Inputs (Level 3)
	Three months ended March 31, 2014
(In millions)	Debt Securities		Other		Trust Fund Investments		Derivatives(a)			Total
Beginning balance	$	16	$	10	$	56	$	13		$	95
Total gains/(losses) — realized/unrealized:
Included in earnings	—		1		—		16			17
Included in OCI	2		—		—		—			2
Purchases	—		—		—		(21		)	(21		)
Contracts acquired in Dominion acquisition	—		—		—		3			3
Transfers into Level 3 (b)	—		—		—		18			18
Transfers out of Level 3 (b)	—		—		—		(6		)	(6		)
Ending balance as of March 31, 2014	$	18	$	11	$	56	$	23		$	108
Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held as of March 31, 2014	—		—		—		19			19

(a) Consists of derivative assets and liabilities, net.

(b) Transfers in/out of Level 3 are related to the availability of external broker quotes and are valued as of the end of the reporting period. All transfers in/out are with Level 2.

Net counterparty credit exposure by industry sector and by counterparty credit quality

The following tables highlight net counterparty credit exposure by industry sector and by counterparty credit quality. Net counterparty credit exposure is defined as the aggregate net asset position for NRG with counterparties where netting is permitted under the enabling agreement and includes all cash flow, mark-to-market and NPNS, and non-derivative transactions. The exposure is shown net of collateral held, and includes amounts net of receivables or payables.

	Net Exposure (a)
Category	(% of Total)
Financial institutions	48	%
Utilities, energy merchants, marketers and other	32
ISOs	20
Total as of March 31, 2015	100	%

	Net Exposure (a)
Category	(% of Total)
Investment grade	96	%
Non-rated (b)	2
Non-investment grade	2
Total as of March 31, 2015	100	%

(a) Counterparty credit exposure excludes uranium and coal transportation contracts because of the unavailability of market prices.

(b) For non-rated counterparties, a significant portion are related to ISO and municipal public power entities, which are considered investment grade equivalent ratings based on NRG's internal credit ratings.

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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Apr. 09, 2015
Noncontrolling Interest [Line Items]
Capital expenditures accrued and unpaid	$ 40
Stockholders' Equity Attributable to Noncontrolling Interest	1,848		1,914
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(24)
Non-cash Increase to Noncontrolling interest	14
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	(29)	(15)
NRG Yield, Inc.
Noncontrolling Interest [Line Items]
Sale of Assets Under Common Control	(27)
NRG RPV Holdco [Member] | NRG Yield, Inc.
Noncontrolling Interest [Line Items]
Capital Contribution to Equity Method Investment				$ 26

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

This footnote should be read in conjunction with the complete description under Note 22, Commitments and Contingencies, to the Company's 2014 Form 10-K.

Commitments

First Lien Structure

NRG has granted first liens to certain counterparties on a substantial portion of the Company's assets, excluding assets acquired in the GenOn and EME (including Midwest Generation) acquisitions, assets held by NRG Yield, Inc. and NRG's assets that have project-level financing, to reduce the amount of cash collateral and letters of credit that it would otherwise be required to post from time to time to support its obligations under out-of-the-money hedge agreements for forward sales of power or MWh equivalents. The Company's lien counterparties may have a claim on NRG's assets to the extent market prices exceed the hedged price. As of March 31, 2015, hedges under the first liens were in-the-money for NRG on a counterparty aggregate basis.

Contingencies

The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. NRG records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. In addition, legal costs are expensed as incurred. Management has assessed each of the following matters based on current information and made a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. Unless specified below, the Company is unable to predict the outcome of these legal proceedings or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded reserves and that such difference could be material.

In addition to the legal proceedings noted below, NRG and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect NRG's consolidated financial position, results of operations, or cash flows.

Midwest Generation Asbestos Liabilities— The Company, through its subsidiary, Midwest Generation, may be subject to potential asbestos liabilities as a result of its acquisition of EME. The Company is currently analyzing the scope of potential liability as it may relate to Midwest Generation. The Company believes that it has established an adequate reserve to deal with these cases.

Actions Pursued by MC Asset Recovery—With Mirant Corporation's emergence from bankruptcy protection in 2006, certain actions filed by GenOn Energy Holdings and some of its subsidiaries against third parties were transferred to MC Asset Recovery, a wholly owned subsidiary of GenOn Energy Holdings.  MC Asset Recovery is governed by a manager who is independent of NRG and GenOn.  MC Asset Recovery is a disregarded entity for income tax purposes. Under the remaining action transferred to MC Asset Recovery, MC Asset Recovery seeks to recover damages from Commerzbank AG and various other banks, or the Commerzbank Defendants, for alleged fraudulent transfers that occurred prior to Mirant's bankruptcy proceedings.  In December 2010, the U.S. District Court for the Northern District of Texas dismissed MC Asset Recovery's complaint against the Commerzbank Defendants.  In January 2011, MC Asset Recovery appealed the District Court's dismissal of its complaint against the Commerzbank Defendants to the U.S. Court of Appeals for the Fifth Circuit.  In March 2012, the Court of Appeals reversed the District Court's dismissal and reinstated MC Asset Recovery's amended complaint against the Commerzbank Defendants.  If MC Asset Recovery succeeds in obtaining any recoveries from the Commerzbank Defendants, the Commerzbank Defendants have asserted that they will seek to file claims in Mirant's bankruptcy proceedings for the amount of those recoveries.  GenOn Energy Holdings would vigorously contest the allowance of any such claims. If the Commerzbank Defendants were to receive an allowed claim as a result of a recovery by MC Asset Recovery on its claims against them, GenOn Energy Holdings would retain from the net amount recovered by MC Asset Recovery an amount equal to the dollar amount of the resulting allowed claim.

Pending Natural Gas Litigation—GenOn is party to several lawsuits, certain of which are class action lawsuits, in state and federal courts in Kansas, Missouri, Nevada and Wisconsin. These lawsuits were filed in the aftermath of the California energy crisis in 2000 and 2001 and the resulting FERC investigations and relate to alleged conduct to increase natural gas prices in violation of antitrust and similar laws. The lawsuits seek treble or punitive damages, restitution and/or expenses. The lawsuits also name as parties a number of energy companies unaffiliated with NRG. In July 2011, the U.S. District Court for the District of Nevada, which was handling four of the five cases, granted the defendants' motion for summary judgment and dismissed all claims against GenOn in those cases. The plaintiffs appealed to the U.S. Court of Appeals for the Ninth Circuit which reversed the decision of the District Court. On August 26, 2013, GenOn along with the other defendants in the lawsuit filed a petition for a writ of certiorari to the U.S. Supreme Court challenging the Court of Appeals' decision. On July 1, 2014, the U.S. Supreme Court granted the petition. On April 21, 2015, the U.S. Supreme Court affirmed the Ninth Circuit’s holding that plaintiffs’ state antitrust law claims are not field-preempted.  The U.S. Supreme Court left open whether the claims were preempted on the basis of conflict preemption and directed that the case be sent to the U.S. District Court for the District of Nevada for further proceedings.

In September 2012, the State of Nevada Supreme Court, which was handling the remaining case, affirmed dismissal by the Eighth Judicial District Court for Clark County, Nevada of all plaintiffs' claims against GenOn. In February 2013, the plaintiffs in the Nevada case filed a petition for a writ of certiorari to the U.S. Supreme Court. In June 2013, the U.S. Supreme Court denied the petition for a writ of certiorari, thereby ending one of the five lawsuits. GenOn has agreed to indemnify CenterPoint against certain losses relating to these lawsuits.

Cheswick Class Action Complaint —In April 2012, a putative class action lawsuit was filed against GenOn in the Court of Common Pleas of Allegheny County, Pennsylvania alleging that emissions from the Cheswick generating facility have damaged the property of neighboring residents. The Company disputes these allegations. Plaintiffs have brought nuisance, negligence, trespass and strict liability claims seeking both damages and injunctive relief. Plaintiffs seek to certify a class that consists of people who own property or live within one mile of the Company's plant. In July 2012, the Company removed the lawsuit to the U.S. District Court for the Western District of Pennsylvania. In October 2012, the District Court granted the Company's motion to dismiss, which plaintiffs appealed to the U.S. Court of Appeals for the Third Circuit. On August 20, 2013, the Court of Appeals reversed the decision of the District Court. On September 3, 2013, the Company filed a petition for rehearing with the Court of Appeals which was subsequently denied. In February 2014, the Company filed a petition for a writ of certiorari to the U.S. Supreme Court seeking review and reversal of the Court of Appeals' decision. On June 2, 2014, the U.S. Supreme Court denied the petition for a writ of certiorari. Following the U.S. Supreme Court's denial of GenOn’s petition for a writ of certiorari, the case continued to be litigated before the U.S. District Court for the Western District of Pennsylvania. After briefing by the parties on GenOn's motion to strike class allegations in the complaint, the court granted GenOn's motion, but allowed the plaintiffs the opportunity to re-file their complaint. On February 3, 2015, plaintiffs sought leave to file an amended complaint, which the Company is contesting.

Energy Plus Holdings—On August 7, 2012, Energy Plus Holdings received a subpoena from the NYAG which generally sought information and business records related to Energy Plus Holdings' sales, marketing and business practices. Energy Plus Holdings provided documents and information to the NYAG. Energy Plus Holdings continues to cooperate and discuss a resolution of these issues with the NYAG.

Maryland Department of the Environment v. GenOn Chalk Point and GenOn Mid-Atlantic— On January 25, 2013, Food & Water Watch, the Patuxent Riverkeeper and the Potomac Riverkeeper (together, the Citizens Group) sent GenOn Mid-Atlantic a letter alleging that the Chalk Point, Dickerson and Morgantown generating facilities were violating the terms of the three National Pollution Discharge Elimination System permits by discharging nitrogen and phosphorous in excess of the limits in each permit. On March 21, 2013, the MDE sent GenOn Mid-Atlantic a similar letter with respect to the Chalk Point and Dickerson generating facilities, threatening to sue within 60 days if the generating facilities were not brought into compliance. On June 11, 2013, the Maryland Attorney General on behalf of the MDE filed a complaint in the U.S. District Court for the District of Maryland alleging violations of the CWA and Maryland environmental laws related to water. The lawsuit is ongoing and seeks injunctive relief and civil penalties in excess of $100,000. The Company does not expect the resolution of this matter to have a material impact on the Company's consolidated financial position, results of operations, or cash flows.

Midwest Generation New Source Review Litigation— In August 2009, the EPA and the Illinois Attorney General, or the Government Plaintiffs, filed a complaint, or the Governments’ Complaint, in the U.S. District Court for the Northern District of Illinois alleging violations of CAA PSD requirements by Midwest Generation arising from maintenance, repair or replacement projects at six Illinois coal-fired electric generating stations performed by Midwest Generation or ComEd, a prior owner of the stations, including alleged failures to obtain PSD construction permits and to comply with BACT requirements. The Government Plaintiffs also alleged violations of opacity and PM standards at the Midwest Generation plants. Finally, the Government Plaintiffs alleged that Midwest Generation violated certain operating permit requirements under Title V of the CAA allegedly arising from such claimed PSD, opacity and PM emission violations. In addition to seeking penalties of up to $37,500 per violation, per day, the complaint seeks an injunction ordering Midwest Generation to install controls sufficient to meet BACT emission rates at the units subject to the complaint and other remedies, which could go well beyond the requirements of the CPS. Several environmental groups intervened as plaintiffs in this litigation and filed a complaint, or the Intervenors’ Complaint, which alleged opacity, PM and related Title V violations. Midwest Generation filed a motion to dismiss nine of the ten PSD counts in the Governments’ Complaint, and to dismiss the tenth PSD count to the extent the Governments’ Complaint sought civil penalties for that count. The trial court granted the motion in March 2010.

In June 2010, the Government Plaintiffs and Intervenors each filed an amended complaint. The Governments’ Amended Complaint again alleged that Midwest Generation violated PSD (based upon the same projects as alleged in their original complaint, but adding allegations that the Company was liable as the “successor” to ComEd), Title V and opacity and PM standards. It named EME and ComEd as additional defendants and alleged PSD violations (again, premised on the same projects) against them. The Intervenors’ Amended Complaint named only Midwest Generation as a defendant and alleged Title V and opacity/PM violations, as well as one of the ten PSD violations alleged in the Governments’ Amended Complaint. Midwest Generation again moved to dismiss all but one of the Government Plaintiffs’ PSD claims and the related Title V claims. Midwest Generation also filed a motion to dismiss the PSD claim in the Intervenors’ Amended Complaint and the related Title V claims. In March 2011, the trial court granted Midwest Generation’s partial motion to dismiss the Government Plaintiffs’ PSD claims. The trial court denied Midwest Generation’s motion to dismiss the PSD claim asserted in the Intervenors’ Amended Complaint, but noted that the plaintiffs would be required to convince the court that the statute of limitations should be equitably tolled. The trial court did not address other counts in the amended complaints that allege violations of opacity and PM emission limitations under the Illinois State Implementation Plan and related Title V claims. The trial court also granted the motions to dismiss the PSD claims asserted against EME and ComEd.

Following the trial court ruling, the Government Plaintiffs appealed the trial court’s dismissals of their PSD claims, including the dismissal of nine of the ten PSD claims against Midwest Generation and of the PSD claims against the other defendants. Those PSD claim dismissals were affirmed by the U.S. Court of Appeals for the Seventh Circuit in July 2013. In addition, in 2012, all but one of the environmental groups that had intervened in the case dismissed their claims without prejudice. As a result, only one environmental group remains a plaintiff intervenor in the case. The Company does not expect the resolution of this matter to have a material impact on the Company’s consolidated financial position, results of operations or cash flows.