10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2017

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number: 001-3034

Xcel Energy Inc.

(Exact name of registrant as specified in its charter)

Minnesota	41-0448030
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
414 Nicollet Mall
Minneapolis, Minnesota	55401
(Address of principal executive offices)	(Zip Code)

(612) 330-5500

(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.    x Yes  ¨ No

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 and 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).    x Yes  ¨ No

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

Large accelerated filer x	Accelerated filer ¨
Non-accelerated filer ¨	Smaller reporting company ¨
(Do not check if smaller reporting company)	Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). ¨ Yes x No

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Outstanding at July 24, 2017
Common Stock, $2.50 par value	507,762,881 shares

TABLE OF CONTENTS

PART I	FINANCIAL INFORMATION
Item 1 —	Financial Statements (unaudited)	3
	CONSOLIDATED STATEMENTS OF INCOME	3
	CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME	4
	CONSOLIDATED STATEMENTS OF CASH FLOWS	5
	CONSOLIDATED BALANCE SHEETS	6
	CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS’ EQUITY	7
	NOTES TO CONSOLIDATED FINANCIAL STATEMENTS	9
Item 2 —	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3 —	Quantitative and Qualitative Disclosures about Market Risk	52
Item 4 —	Controls and Procedures	52
PART II	OTHER INFORMATION
Item 1 —	Legal Proceedings	53
Item 1A —	Risk Factors	53
Item 2 —	Unregistered Sales of Equity Securities and Use of Proceeds	53
Item 6 —	Exhibits	54
SIGNATURES		55
	Certifications Pursuant to Section 302	1
	Certifications Pursuant to Section 906	1
	Statement Pursuant to Private Litigation	1

This Form 10-Q is filed by Xcel Energy Inc.  Xcel Energy Inc. wholly owns the following subsidiaries: Northern States Power Company, a Minnesota corporation (NSP-Minnesota); Northern States Power Company, a Wisconsin corporation (NSP-Wisconsin); Public Service Company of Colorado (PSCo); and Southwestern Public Service Company (SPS).  Xcel Energy Inc. and its consolidated subsidiaries are also referred to herein as Xcel Energy.  NSP-Minnesota, NSP-Wisconsin, PSCo and SPS are also referred to collectively as utility subsidiaries.  The electric production and transmission system of NSP-Minnesota and NSP-Wisconsin, which is operated on an integrated basis and is managed by NSP-Minnesota, is referred to collectively as the NSP System. Additional information on the wholly owned subsidiaries is available on various filings with the Securities and Exchange Commission (SEC).

2

PART I — FINANCIAL INFORMATION

Item 1 — FINANCIAL STATEMENTS

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (amounts in thousands, except per share data)
	Three Months Ended June 30						Six Months Ended June 30
	2017			2016			2017			2016
Operating revenues
Electric	$	2,338,017		$	2,224,142		$	4,637,077		$	4,409,261
Natural gas	289,839			258,899			915,542			824,588
Other	17,072			16,808			38,731			38,273
Total operating revenues	2,644,928			2,499,849			5,591,350			5,272,122
Operating expenses
Electric fuel and purchased power	919,099			855,968			1,844,320			1,717,820
Cost of natural gas sold and transported	114,320			90,071			479,454			402,188
Cost of sales — other	8,178			8,332			16,765			16,577
Operating and maintenance expenses	578,133			596,978			1,164,563			1,174,388
Conservation and demand side management expenses	64,860			55,916			132,393			113,352
Depreciation and amortization	365,720			322,534			730,924			642,554
Taxes (other than income taxes)	134,926			138,469			277,020			283,792
Total operating expenses	2,185,236			2,068,268			4,645,439			4,350,671
Operating income	459,692			431,581			945,911			921,451
Other income, net	2,608			1,560			9,054			5,810
Equity earnings of unconsolidated subsidiaries	7,541			9,617			15,416			22,799
Allowance for funds used during construction — equity	16,386			14,730			30,699			27,843
Interest charges and financing costs
Interest charges — includes other financing costs of $5,876, $6,630, $11,734 and $12,966, respectively	164,195			162,980			330,129			319,423
Allowance for funds used during construction — debt	(7,613		)	(6,684		)	(14,635		)	(12,674		)
Total interest charges and financing costs	156,582			156,296			315,494			306,749
Income before income taxes	329,645			301,192			685,586			671,154
Income taxes	102,389			104,397			219,053			233,047
Net income	$	227,256		$	196,795		$	466,533		$	438,107
Weighted average common shares outstanding:
Basic	508,542			508,930			508,411			508,789
Diluted	509,135			509,490			508,955			509,311
Earnings per average common share:
Basic	$	0.45		$	0.39		$	0.92		$	0.86
Diluted	0.45			0.39			0.92			0.86
Cash dividends declared per common share	$	0.36		$	0.34		$	0.72		$	0.68
See Notes to Consolidated Financial Statements

3

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (amounts in thousands)
	Three Months Ended June 30				Six Months Ended June 30
	2017		2016		2017		2016
Net income	$	227,256	$	196,795	$	466,533	$	438,107
Other comprehensive income
Pension and retiree medical benefits:
Amortization of losses included in net periodic benefit cost, net of tax of $608, $550, $1,223 and $407, respectively	956		865		1,904		1,076
Derivative instruments:
Net fair value increase, net of tax of $17, $7, $17 and $5, respectively	26		12		26		8
Reclassification of losses to net income, net of tax of $511, $594, $1,045 and $1,198, respectively	803		936		1,628		1,874
	829		948		1,654		1,882
Marketable securities:
Net fair value increase, net of tax of $0, $0, $0 and $0, respectively	1		—		1		—
Other comprehensive income	1,786		1,813		3,559		2,958
Comprehensive income	$	229,042	$	198,608	$	470,092	$	441,065
See Notes to Consolidated Financial Statements

4

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (amounts in thousands)
	Six Months Ended June 30
	2017			2016
Operating activities
Net income	$	466,533		$	438,107
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	738,280			650,336
Conservation and demand side management program amortization	1,509			2,323
Nuclear fuel amortization	57,003			58,267
Deferred income taxes	309,239			252,889
Amortization of investment tax credits	(2,557		)	(2,613		)
Allowance for equity funds used during construction	(30,699		)	(27,843		)
Equity earnings of unconsolidated subsidiaries	(15,416		)	(22,799		)
Dividends from unconsolidated subsidiaries	23,507			22,910
Share-based compensation expense	31,892			24,454
Net realized and unrealized hedging and derivative transactions	217			3,903
Other, net	(2,441		)	(388		)
Changes in operating assets and liabilities:
Accounts receivable	16,906			35,042
Accrued unbilled revenues	121,333			65,159
Inventories	65,433			81,880
Other current assets	(84,024		)	69,493
Accounts payable	(52,349		)	27,805
Net regulatory assets and liabilities	1,498			34,264
Other current liabilities	(190,184		)	(151,589		)
Pension and other employee benefit obligations	(140,479		)	(108,562		)
Change in other noncurrent assets	(6,676		)	(6,363		)
Change in other noncurrent liabilities	(16,706		)	(21,649		)
Net cash provided by operating activities	1,291,819			1,425,026
Investing activities
Utility capital/construction expenditures	(1,473,793		)	(1,413,129		)
Proceeds from insurance recoveries	—			1,595
Allowance for equity funds used during construction	30,699			27,843
Purchases of investment securities	(368,266		)	(319,880		)
Proceeds from the sale of investment securities	350,448			262,321
Investments in WYCO Development LLC and other	(7,683		)	(2,170		)
Other, net	(5,483		)	100
Net cash used in investing activities	(1,474,078		)	(1,443,320		)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	392,000			(399,000		)
Proceeds from issuance of long-term debt	394,046			1,337,430
Repayments of long-term debt	(250,397		)	(579,976		)
Repurchases of common stock	(2,943		)	(789		)
Dividends paid	(355,250		)	(335,113		)
Other	(18,291		)	(12,487		)
Net cash provided by financing activities	159,165			10,065
Net change in cash and cash equivalents	(23,094		)	(8,229		)
Cash and cash equivalents at beginning of period	84,476			84,940
Cash and cash equivalents at end of period	$	61,382		$	76,711
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	$	(301,350	)	$	(293,954	)
Cash (paid) received for income taxes, net	(3,853		)	61,345
Supplemental disclosure of non-cash investing and financing transactions:
Property, plant and equipment additions in accounts payable	$	233,250		$	252,370
Issuance of common stock for equity awards	18,505			13,497
See Notes to Consolidated Financial Statements

5

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (UNAUDITED) (amounts in thousands, except share and per share data)
	June 30, 2017			Dec. 31, 2016
Assets
Current assets
Cash and cash equivalents	$	61,382		$	84,476
Accounts receivable, net	759,378			776,289
Accrued unbilled revenues	608,499			729,832
Inventories	542,044			604,226
Regulatory assets	375,020			363,655
Derivative instruments	78,487			38,224
Prepaid taxes	196,247			106,697
Prepayments and other	135,493			138,682
Total current assets	2,756,550			2,842,081
Property, plant and equipment, net	33,543,843			32,841,750
Other assets
Nuclear decommissioning fund and other investments	2,231,588			2,091,858
Regulatory assets	3,023,128			3,080,867
Derivative instruments	50,410			50,189
Other	255,470			248,532
Total other assets	5,560,596			5,471,446
Total assets	$	41,860,989		$	41,155,277
Liabilities and Equity
Current liabilities
Current portion of long-term debt	$	505,345		$	255,529
Short-term debt	784,000			392,000
Accounts payable	973,642			1,044,959
Regulatory liabilities	261,171			220,894
Taxes accrued	339,966			457,392
Accrued interest	175,849			172,901
Dividends payable	182,795			172,456
Derivative instruments	28,019			26,959
Other	439,917			503,953
Total current liabilities	3,690,704			3,247,043
Deferred credits and other liabilities
Deferred income taxes	7,130,715			6,784,319
Deferred investment tax credits	60,659			63,216
Regulatory liabilities	1,386,675			1,383,212
Asset retirement obligations	2,849,532			2,782,229
Derivative instruments	136,255			148,146
Customer advances	190,640			195,214
Pension and employee benefit obligations	975,606			1,112,366
Other	225,215			223,965
Total deferred credits and other liabilities	12,955,297			12,692,667
Commitments and contingencies
Capitalization
Long-term debt	14,091,833			14,194,718
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 507,762,881 and 507,222,795 shares outstanding at June 30, 2017 and Dec. 31, 2016, respectively	1,269,407			1,268,057
Additional paid in capital	5,881,475			5,881,494
Retained earnings	4,079,068			3,981,652
Accumulated other comprehensive loss	(106,795		)	(110,354		)
Total common stockholders’ equity	11,123,155			11,020,849
Total liabilities and equity	$	41,860,989		$	41,155,277
See Notes to Consolidated Financial Statements

6

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS’ EQUITY (UNAUDITED) (amounts in thousands)
	Common Stock Issued						Retained Earnings			Accumulated Other Comprehensive Loss			Total Common Stockholders’ Equity
	Shares	Par Value		Additional Paid In Capital
Three Months Ended June 30, 2017 and 2016
Balance at March 31, 2016	507,953	$	1,269,882	$	5,889,939		$	3,620,421		$	(108,608	)	$	10,671,634
Net income							196,795						196,795
Other comprehensive income										1,813			1,813
Dividends declared on common stock							(173,563		)				(173,563		)
Issuances of common stock	—	—		(187		)							(187		)
Share-based compensation				6,642									6,642
Balance at June 30, 2016	507,953	$	1,269,882	$	5,896,394		$	3,643,653		$	(106,795	)	$	10,703,134
Balance at March 31, 2017	507,763	$	1,269,407	$	5,872,933		$	4,036,352		$	(108,581	)	$	11,070,111
Net income							227,256						227,256
Other comprehensive income										1,786			1,786
Dividends declared on common stock							(183,738		)				(183,738		)
Share-based compensation				8,542			(802		)				7,740
Balance at June 30, 2017	507,763	$	1,269,407	$	5,881,475		$	4,079,068		$	(106,795	)	$	11,123,155
See Notes to Consolidated Financial Statements

7

XCEL ENERGY INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS’ EQUITY (UNAUDITED) (Continued) (amounts in thousands)
	Common Stock Issued								Retained Earnings			Accumulated Other Comprehensive Loss			Total Common Stockholders’ Equity
	Shares		Par Value			Additional Paid In Capital
Six Months Ended June 30, 2017 and 2016
Balance at Dec. 31, 2015	507,536		$	1,268,839		$	5,889,106		$	3,552,728		$	(109,753	)	$	10,600,920
Net income									438,107						438,107
Other comprehensive income												2,958			2,958
Dividends declared on common stock									(347,182		)				(347,182		)
Issuances of common stock	417		1,043			(3,942		)							(2,899		)
Repurchases of common stock						(789		)							(789		)
Share-based compensation						12,019									12,019
Balance at June 30, 2016	507,953		$	1,269,882		$	5,896,394		$	3,643,653		$	(106,795	)	$	10,703,134
Balance at Dec. 31, 2016	507,223		$	1,268,057		$	5,881,494		$	3,981,652		$	(110,354	)	$	11,020,849
Net income									466,533						466,533
Other comprehensive income												3,559			3,559
Dividends declared on common stock									(367,553		)				(367,553		)
Issuances of common stock	611		1,527			3,510									5,037
Repurchases of common stock	(71	)	(177		)	(2,943		)							(3,120		)
Share-based compensation						(586		)	(1,564		)				(2,150		)
Balance at June 30, 2017	507,763		$	1,269,407		$	5,881,475		$	4,079,068		$	(106,795	)	$	11,123,155
See Notes to Consolidated Financial Statements

8

XCEL ENERGY INC. AND SUBSIDIARIES

Notes to Consolidated Financial Statements (UNAUDITED)

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly, in accordance with accounting principles generally accepted in the United States of America (GAAP), the financial position of Xcel Energy Inc. and its subsidiaries as of June 30, 2017 and Dec. 31, 2016; the results of its operations, including the components of net income and comprehensive income, and changes in stockholders’ equity for the three and six months endedJune 30, 2017 and 2016; and its cash flows for the six months endedJune 30, 2017 and 2016. All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after June 30, 2017 up to the date of issuance of these consolidated financial statements. These statements contain all necessary adjustments and disclosures resulting from that evaluation.The Dec. 31, 2016 balance sheet information has been derived from the audited 2016 consolidated financial statements included in the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016. These notes to the consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP on an annual basis have been condensed or omitted pursuant to such rules and regulations. For further information, refer to the consolidated financial statements and notes thereto, included in the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016, filed with the SEC on Feb. 24, 2017. Due to the seasonality of Xcel Energy’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.

1. Summary of Significant Accounting Policies

The significant accounting policies set forth in Note 1 to the consolidated financial statements in the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016, appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

2. Accounting Pronouncements

Recently Issued

Revenue Recognition— In May 2014, the Financial Accounting Standards Board (FASB) issued Revenue from Contracts with Customers, Topic 606 (Accounting Standards Update (ASU) No. 2014-09), which provides a new framework for the recognition of revenue. Xcel Energy expects its adoption will result in increased disclosures regarding revenue, cash flows and obligations related to arrangements with customers, as well as separate presentation of alternative revenue programs. Xcel Energy has not yet fully determined the impacts of adoption for several aspects of the standard, including a determination whether and how much an evaluation of the collectability of regulated electric and gas revenues will impact the amounts of revenue recognized upon delivery. Xcel Energy currently expects to implement the standard on a modified retrospective basis, which requires application to contracts with customers effective Jan. 1, 2018, with the cumulative impact on contracts not yet completed as of Dec. 31, 2017 recognized as an adjustment to the opening balance of retained earnings.

Classification and Measurement of Financial Instruments — In January 2016, the FASB issued Recognition and Measurement of Financial Assets and Financial Liabilities, Subtopic 825-10 (ASU No. 2016-01), which eliminates the available-for-sale classification for marketable equity securities and also replaces the cost method of accounting for non-marketable equity securities with a model for recognizing impairments and observable price changes. Under the new standard, other than when the consolidation or equity method of accounting is utilized, changes in the fair value of equity securities are to be recognized in earnings. This guidance will be effective for interim and annual reporting periods beginning after Dec. 15, 2017. Xcel Energy expects that as a result of application of accounting principles for rate regulated entities, changes in the fair value of the securities in the nuclear decommissioning fund, currently classified as available-for-sale, will continue to be deferred to a regulatory asset, and that the overall impacts of the Jan. 1, 2018 adoption will not be material.

Leases —In February 2016, the FASB issued Leases, Topic 842 (ASU No. 2016-02), which for lessees requires balance sheet recognition of right-of-use assets and lease liabilities for most leases. This guidance will be effective for interim and annual reporting periods beginning after Dec. 15, 2018. Xcel Energy has not yet fully determined the impacts of implementation. However, adoption is expected to occur on Jan. 1, 2019 utilizing the practical expedients provided by the standard. As such, agreements entered prior to Jan. 1, 2017 that are currently considered leases are expected to be recognized on the consolidated balance sheet, including contracts for use of office space, equipment and natural gas storage assets, as well as certain purchased power agreements (PPAs) for natural gas-fueled generating facilities. Xcel Energy expects that similar agreements entered after Dec. 31, 2016 will generally qualify as leases under the new standard, but has not yet completed its evaluation of certain other contracts, including arrangements for the secondary use of assets, such as land easements.

9

Presentation of Net Periodic Benefit Cost —In March 2017, the FASB issued Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Topic 715 (ASU No. 2017-07), which establishes that only the service cost element of pension cost may be presented as a component of operating income in the income statement. Also under the guidance, only the service cost component of pension cost is eligible for capitalization. Xcel Energy has not yet fully determined the impacts of adoption of the standard, but expects that as a result of application of accounting principles for rate regulated entities, a similar amount of pension cost, including non-service components, will be recognized consistent with the current ratemaking treatment and that the impacts of adoption will be limited to changes in classification of non-service costs in the consolidated statement of income. This guidance will be effective for interim and annual reporting periods beginning after Dec. 15, 2017.

Recently Adopted

Stock Compensation —In March 2016, the FASB issued Improvements to Employee Share-Based Payment Accounting, Topic 718 (ASU No. 2016-09), which simplifies accounting and financial statement presentation for share-based payment transactions. The guidance requires that the difference between the tax deduction available upon settlement of share-based equity awards and the tax benefit accumulated over the vesting period be recognized as an adjustment to income tax expense. Xcel Energy adopted the guidance in 2016, resulting in immaterial 2016 adjustments to income tax expense and changes in classification of cash flows related to tax withholding in the consolidated statements of cash flows for the years ended Dec. 31, 2016, 2015 and 2014.

3. Selected Balance Sheet Data

(Thousands of Dollars)	June 30, 2017			Dec. 31, 2016
Accounts receivable, net
Accounts receivable	$	808,705		$	827,112
Less allowance for bad debts	(49,327		)	(50,823		)
	$	759,378		$	776,289

(Thousands of Dollars)	June 30, 2017		Dec. 31, 2016
Inventories
Materials and supplies	$	321,426	$	312,430
Fuel	156,736		181,752
Natural gas	63,882		110,044
	$	542,044	$	604,226

(Thousands of Dollars)	June 30, 2017			Dec. 31, 2016
Property, plant and equipment, net
Electric plant	$	38,810,158		$	38,220,765
Natural gas plant	5,465,224			5,317,717
Common and other property	1,959,703			1,888,518
Plant to be retired (a)	17,820			31,839
Construction work in progress	1,571,362			1,373,380
Total property, plant and equipment	47,824,267			46,832,219
Less accumulated depreciation	(14,703,391		)	(14,381,603		)
Nuclear fuel	2,660,606			2,571,770
Less accumulated amortization	(2,237,639		)	(2,180,636		)
	$	33,543,843		$	32,841,750

^(a)  In the second half of 2017, PSCo expects to both early retire Valmont Unit 5 and convert Cherokee Unit 4 from a coal-fueled generating facility to natural gas. PSCo also expects Craig Unit 1 to be early retired in approximately 2025. Amounts are presented net of accumulated depreciation.

10

4. Income Taxes

Except to the extent noted below, Note 6 to the consolidated financial statements included in Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 appropriately represents, in all material respects, the current status of other income tax matters, and are incorporated herein by reference.

Federal Loss Carryback Claims — In 2012-2015, Xcel Energy identified certain expenses related to 2009, 2010, 2011, 2013, 2014 and 2015 that qualify for an extended carryback beyond the typical two-year carryback period. As a result of a higher tax rate in prior years, Xcel Energy recognized a tax benefit of approximately $5 million in 2015, $17 million in 2014, $12 million in 2013 and $15 million in 2012.

Federal Audits— Xcel Energy files a consolidated federal income tax return. The statute of limitations applicable to Xcel Energy’s 2009 through 2013 federal income tax returns, following extensions, expires in December 2017.

In 2012, the Internal Revenue Service (IRS) commenced an examination of tax years 2010 and 2011, including the 2009 carryback claim. The IRS has proposed an adjustment to the federal tax loss carryback claims that would result in $14 million of income tax expense for the 2009 through 2011 claims, and the 2013 through 2015 claims. In 2016 the IRS audit team and Xcel Energy presented their cases to the Office of Appeals; however, the outcome and timing of a resolution is uncertain.

In the third quarter of 2015, the IRS commenced an examination of tax years 2012 and 2013. In the second quarter of 2017, the IRS proposed an adjustment to tax year 2012 that may impact Xcel Energy’s net operating loss (NOL) and effective tax rate (ETR). Xcel Energy is evaluating the IRS’ proposal and the outcome and timing of a resolution is uncertain.

State Audits—Xcel Energy files consolidated state tax returns based on income in its major operating jurisdictions of Colorado, Minnesota, Texas, and Wisconsin, and various other state income-based tax returns. As of June 30, 2017, Xcel Energy’s earliest open tax years that are subject to examination by state taxing authorities in its major operating jurisdictions were as follows:

State	Year
Colorado	2009
Minnesota	2009
Texas	2009
Wisconsin	2012

• In 2016, Minnesota began an audit of years 2010 through 2014. As of June 30, 2017, Minnesota had not proposed any adjustments;

• In 2016, Texas began an audit of years 2009 and 2010. As of June 30, 2017, Texas had not proposed any material adjustments;

• In 2016, Wisconsin began an audit of years 2012 and 2013. As of June 30, 2017, Wisconsin had not proposed any material adjustments; and

• As of June 30, 2017, there were no other state income tax audits in progress.

Unrecognized Benefits — The unrecognized tax benefit balance includes permanent tax positions, which if recognized would affect the annual ETR. In addition, the unrecognized tax benefit balance includes temporary tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. A change in the period of deductibility would not affect the ETR but would accelerate the payment of cash to the taxing authority to an earlier period.

A reconciliation of the amount of unrecognized tax benefit is as follows:

(Millions of Dollars)	June 30, 2017		Dec. 31, 2016
Unrecognized tax benefit — Permanent tax positions	$	30.8	$	29.6
Unrecognized tax benefit — Temporary tax positions	106.6		104.1
Total unrecognized tax benefit	$	137.4	$	133.7

11

The unrecognized tax benefit amounts were reduced by the tax benefits associated with NOL and tax credit carryforwards. The amounts of tax benefits associated with NOL and tax credit carryforwards are as follows:

(Millions of Dollars)	June 30, 2017			Dec. 31, 2016
NOL and tax credit carryforwards	$	(47.4	)	$	(43.8	)

It is reasonably possible that Xcel Energy’s amount of unrecognized tax benefits could significantly change in the next 12 months as the IRS Appeals and audit progress, the Minnesota, Texas and Wisconsin audits progress, and other state audits resume. As the IRS Appeals and IRS, Minnesota, Texas and Wisconsin audits progress, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $61 million.

The payable for interest related to unrecognized tax benefits is partially offset by the interest benefit associated with NOL and tax credit carryforwards. A reconciliation of the beginning and ending amount of the payable for interest related to unrecognized tax benefits are as follows:

(Millions of Dollars)	June 30, 2017			Dec. 31, 2016
Payable for interest related to unrecognized tax benefits at beginning of period	$	(3.4	)	$	(0.1	)
Interest expense related to unrecognized tax benefits recorded during the period	(1.7		)	(3.3		)
Payable for interest related to unrecognized tax benefits at end of period	$	(5.1	)	$	(3.4	)

No amounts were accrued for penalties related to unrecognized tax benefits as of June 30, 2017 or Dec. 31, 2016.

5. Rate Matters

Except to the extent noted below, the circumstances set forth in Note 12 to the consolidated financial statements included in Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 and in Note 5 to Xcel Energy Inc.’s Quarterly Report on

Form 10-Q for the quarterly period ended March 31, 2017, appropriately represent, in all material respects, the current status of other rate matters, and are incorporated herein by reference.

NSP-Minnesota

Pending and Recently Concluded Regulatory Proceedings — Minnesota Public Utilities Commission (MPUC)

Minnesota 2016 Multi-Year Electric Rate Case — In June 2017, the MPUC issued a written order. NSP-Minnesota estimates the total rate increase to be approximately $245 million over the four-year period covering 2016-2019.

Key terms:

• Four-year period covering 2016-2019;

• Annual sales true-up;

• Return on equity (ROE) of 9.2 percent and an equity ratio of 52.5 percent;

• Nuclear related costs will not be considered provisional;

• Continued use of all existing riders, however no new riders may be utilized during the four-year term;

• Deferral of incremental 2016 property tax expense above a fixed threshold to 2018 and 2019;

• Four-year stay-out provision for rate cases;

• Property tax true-up mechanism for 2017-2019; and

• Capital expenditure true-up mechanism for 2016-2019.

(Millions of Dollars, incremental)	2016		2017		2018		2019			Total
Revenues	$	74.99	$	59.86	$	—	$	50.12		$	184.97
NSP-Minnesota’s sales true-up	59.95		—		—		(0.20		)	59.75
Total rate impact	$	134.94	$	59.86	$	—	$	49.92		$	244.72

12

Annual Automatic Adjustment of Fuel Clause Charges — In 2016, the Minnesota Department of Commerce (DOC) recommended the MPUC should hold utilities responsible for incremental costs of replacement power incurred due to unplanned outages at nuclear facilities under certain circumstances. In May 2017, the MPUC voted to disallow approximately $4.4 million of replacement energy costs for the Prairie Island (PI) nuclear facility outages allocated to the Minnesota jurisdiction in 2015. This disallowance was recognized in the second quarter of 2017. The MPUC issued a written order in July 2017. In addition, the DOC is currently reviewing nuclear costs and operations under the initial rate case and resource plan orders as well as the recently finalized rate case.

NSP-Wisconsin

Pending Regulatory Proceeding — Public Service Commission of Wisconsin (PSCW)

Wisconsin 2018 Electric and Natural Gas Rate Case— In May 2017, NSP-Wisconsin filed a request with the PSCW to increase electric rates by $24.7 million, or 3.6 percent, and natural gas rates by $12.0 million, or 10.1 percent, effective January 2018. The rate filing is based on a 2018 forecast test year, a ROE of 10.0 percent, an equity ratio of 52.53 percent and a forecasted average net investment rate base of approximately $1.2 billion for the electric utility and $138.4 million for the natural gas utility.

Key dates in the procedural schedule are as follows:

• Staff and intervenor testimony — Sept. 12, 2017;

• Rebuttal testimony — Sept. 26, 2017;

• Sur-rebuttal testimony — Oct. 3, 2017; and

• Hearing — Oct. 5, 2017.

A PSCW decision is anticipated in the fourth quarter of 2017.

PSCo

Pending and Recently Concluded Regulatory Proceedings — Colorado Public Utilities Commission (CPUC)

Multi-Year Natural Gas Rate Case — In June 2017, PSCo filed a multi-year request with the CPUC seeking to increase retail natural gas rates to recover capital investments and increased operating costs since PSCo’s previous case in 2015. The request, detailed below, is based on forecast test years, a 10.0 percent ROE and an equity ratio of 55.25 percent.

Revenue Request (Millions of Dollars)	2018		2019		2020		Total
New revenue request	$	63.2	$	32.9	$	42.9	$	139.0
Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates (a)	—		93.9		—		93.9
Total	$	63.2	$	126.8	$	42.9	$	232.9
Expected Year-End Rate Base (Billions of dollars) (b)	$	1.5	$	2.3	$	2.4	N/A

^(a) The roll-in of PSIA rider revenue into base rates will not have an impact on customer bills or total revenue as these costs are already being recovered from customers through the rider. PSCo plans to request new PSIA rates for 2018 in November 2017. The recovery of new, incremental PSIA related investments in 2019 and 2020 are included in the base rate request.

^(b) The additional rate base in 2019 predominantly reflects the roll-in of capital associated with the PSIA rider.

Final rates are expected to be effective in February 2018. In conjunction with the multi-year base rate step increases, PSCo is also proposing a stay-out provision and an earnings test through the end of 2020.

Annual Electric Earnings Test — PSCo must share with customers earnings that exceed the authorized ROE of 9.83 percent for 2015 through 2017, as part of an annual earnings test. In July 2017, the CPUC approved PSCo’s 2016 earnings test, which does not result in any earnings sharing. The current estimate of the 2017 earnings test, based on annual forecasted information, did not result in the recognition of a liability as of June 30, 2017.

13

SPS

Pending and Recently Concluded Regulatory Proceedings — Public Utility Commission of Texas (PUCT)

Appeal of the Texas 2015 Electric Rate Case Decision — In 2014, SPS had requested an overall retail electric revenue rate increase of $42.1 million. In 2015, the PUCT approved an overall rate decrease of approximately $4.0 million, net of rate case expenses. In April 2016, SPS filed an appeal, with the Texas State District Court, of the PUCT’s order that had denied SPS’ request for rehearing on certain items in SPS’ Texas 2015 electric rate case related to capital structure, incentive compensation and wholesale load reductions. In March 2017, the Travis County District Court denied SPS’ appeal.  In April 2017, SPS appealed the District Court’s decision to the Court of Appeals.

Texas 2016 Transmission Cost Recovery Factor (TCRF) Application — In February 2017, SPS filed with the PUCT to recover additional annual revenue of approximately $16.1 million through its TCRF, or 1.8 percent. The filing was based upon capital transmission additions made during 2016. In June 2017, the PUCT approved TCRF rider recovery of approximately $14.4 million effective immediately.

Pending Regulatory Proceeding — New Mexico Public Regulation Commission (NMPRC)

New Mexico 2016 Electric Rate Case — In November 2016, SPS filed an electric rate case with the NMPRC seeking an increase in base rates of approximately $41.4 million, representing a total revenue increase of approximately 10.9 percent. The rate filing is based on a requested ROE of 10.1 percent, an equity ratio of 53.97 percent, an electric rate base of approximately $832 million and a future test year ending June 30, 2018.

On April 10, 2017, the hearing examiner determined that SPS’ rate filing was deficient and recommended the NMPRC extend the procedural schedule by approximately one month and restart the suspension period once it is determined that the deficiencies are resolved. On April 19, 2017, the NMPRC dismissed SPS’ rate case. On May 15, 2017, SPS filed a notice of appeal to the New Mexico Supreme Court. A decision from the New Mexico Supreme Court is not expected until the second or third quarter of 2018.

Pending Regulatory Proceeding — Federal Energy Regulatory Commission (FERC)

Midcontinent Independent System Operator, Inc. (MISO) ROE Complaints — In November 2013, a group of customers filed a complaint at the FERC against MISO transmission owners (TOs), including NSP-Minnesota and NSP-Wisconsin. The complaint argued for a reduction in the ROE in transmission formula rates in the MISO region from 12.38 percent to 9.15 percent, and the removal of ROE adders (including those for Regional Transmission Organization (RTO) membership), effective Nov. 12, 2013.

In December 2015, an administrative law judge (ALJ) recommended the FERC approve a base ROE of 10.32 percent for the MISO TOs. The ALJ found the existing 12.38 percent ROE to be unjust and unreasonable. The recommended 10.32 percent ROE applied a FERC ROE policy adopted in a June 2014 order (Opinion 531). The FERC approved the ALJ recommended 10.32 percent base ROE in an order issued in September 2016. This ROE would be applicable for the 15 month refund period from Nov. 12, 2013 to Feb. 11, 2015, and prospectively from the date of the FERC order. The total prospective ROE would be 10.82 percent, including a 50 basis point adder for RTO membership. Various parties requested rehearing of the September 2016 order. The requests are pending FERC action.

In February 2015, a second complaint seeking to reduce the MISO ROE from 12.38 percent to 8.67 percent prior to any adder was filed with the FERC, resulting in a second period of potential refund from Feb. 12, 2015 to May 11, 2016. In June 2016, the ALJ recommended a ROE of 9.7 percent, applying the methodology adopted by the FERC in Opinion 531. A final FERC decision on the second ROE complaint was expected later in 2017, but in April 2017, the United States Court of Appeals for the District of Columbia Circuit (D.C. Circuit) by opinion, vacated and remanded Opinion 531. It is unclear how the D.C. Circuit’s opinion to vacate and remand Opinion 531 will affect the September 2016 FERC order or the timing and outcome of the second ROE complaint. The MISO TOs are evaluating the impact of the D.C. Circuit ruling on the November 2013 and February 2015 ROE complaints.

As of June 30, 2017, NSP-Minnesota has processed the refunds for the Nov. 12, 2013 to Feb. 11, 2015 complaint period based on the 10.32 percent ROE provided in the September 2016 FERC order. NSP-Minnesota has also recognized a current refund liability consistent with the best estimate of the final ROE for the Feb. 12, 2015 to May 11, 2016 complaint period.

14

6. Commitments and Contingencies

Except to the extent noted below and in Note 5 above, the circumstances set forth in Notes 12, 13 and 14 to the consolidated financial statements included in Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016, and in Notes 5 and 6 to the

consolidated financial statements included in Xcel Energy Inc.’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017 appropriately represent, in all material respects, the current status of commitments and contingent liabilities and are incorporated herein by reference. The following include commitments, contingencies and unresolved contingencies that are material to Xcel Energy’s financial position.

PPAs

Under certain PPAs, NSP-Minnesota, PSCo and SPS purchase power from independent power producing entities for which the utility subsidiaries are required to reimburse natural gas or biomass fuel costs, or to participate in tolling arrangements under which the utility subsidiaries procure the natural gas required to produce the energy that they purchase. These specific PPAs create a variable interest in the associated independent power producing entity.

The Xcel Energy utility subsidiaries had approximately 3,537 megawatts (MW) of capacity under long-term PPAs as of June 30, 2017 and Dec. 31, 2016, with entities that have been determined to be variable interest entities. Xcel Energy has concluded that these entities are not required to be consolidated in its consolidated financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. These agreements have expiration dates through 2041.

Guarantees and Bond Indemnifications

Xcel Energy Inc. and its subsidiaries provide guarantees and bond indemnities under specified agreements or transactions. The guarantees and bond indemnities issued by Xcel Energy Inc. guarantee payment or performance by its subsidiaries. As a result, Xcel Energy Inc.’s exposure under the guarantees and bond indemnities is based upon the net liability of the relevant subsidiary under the specified agreements or transactions. Most of the guarantees and bond indemnities issued by Xcel Energy Inc. and its subsidiaries have a stated maximum guarantee or indemnity amount. As of June 30, 2017 and Dec. 31, 2016, Xcel Energy Inc. and its subsidiaries had no assets held as collateral related to their guarantees, bond indemnities and indemnification agreements.

The following table presents guarantees and bond indemnities issued and outstanding for Xcel Energy:

(Millions of Dollars)	June 30, 2017		Dec. 31, 2016
Guarantees issued and outstanding	$	18.3	$	18.8
Current exposure under these guarantees	—		0.1
Bonds with indemnity protection	49.4		43.0

Other Indemnification Agreements

Xcel Energy Inc. and its subsidiaries provide indemnifications through contracts entered into in the normal course of business. These are primarily indemnifications against adverse litigation outcomes in connection with underwriting agreements, as well as breaches of representations and warranties, including corporate existence, transaction authorization and income tax matters with respect to assets sold. Xcel Energy Inc.’s and its subsidiaries’ obligations under these agreements may be limited in terms of duration and amount. The maximum future payments under these indemnifications cannot be reasonably estimated as the dollar amounts are often not explicitly stated.

Environmental Contingencies

Ashland Manufactured Gas Plant (MGP) Site — NSP-Wisconsin was named a potentially responsible party (PRP) for contamination at a site in Ashland, Wis. The Ashland/Northern States Power Lakefront Superfund Site (the Site) includes NSP-Wisconsin property, previously operated as a MGP facility (the Upper Bluff), and two other properties: an adjacent city lakeshore park area (Kreher Park); and an area of Lake Superior’s Chequamegon Bay adjoining the park.

15

In 2012, NSP-Wisconsin agreed to remediate the Phase I Project Area (which includes the Upper Bluff and Kreher Park areas of the Site), under a settlement agreement with the United States Environmental Protection Agency (EPA).

NSP-Wisconsin performed a wet dredge pilot study in 2016 and demonstrated that a wet dredge remedy can meet the performance standards for remediation of the Phase II Project Area (the Sediments). As a result, the EPA authorized NSP-Wisconsin to extend the wet dredge pilot to additional areas of the Site. In January 2017, NSP-Wisconsin agreed to remediate the Sediments, under a settlement agreement with the EPA. The settlement was approved by the U.S. District Court for the Western District of Wisconsin. NSP-Wisconsin has initiated field activities to perform a full scale wet dredge remedy of the Sediments in 2017, with performance of restoration activities in 2018.

The current cost estimate for the entire site is approximately $160.0 million, of which approximately $113.2 million has been spent. At June 30, 2017 and Dec. 31, 2016, NSP-Wisconsin had recorded a total liability of $46.8 million and $64.3 million, respectively, for the entire site.

NSP-Wisconsin has deferred the unrecovered portion of the estimated Site remediation costs as a regulatory asset. The PSCW has authorized NSP-Wisconsin rate recovery for all remediation costs incurred at the Site. In 2012, the PSCW agreed to allow NSP-Wisconsin to pre-collect certain costs, to amortize costs over a ten-year period and to apply a three percent carrying cost to the unamortized regulatory asset. In May 2017, NSP-Wisconsin filed a natural gas rate case which included recovery of additional expenses associated with remediating the Site. If approved, the annual recovery of MGP clean-up costs would increase from $12.4 million in 2017 to $18.1 million in 2018.

Fargo, N.D. MGP Site — In May 2015, underground pipes, tars and impacted soils were discovered in a right-of-way in Fargo, N.D. that appeared to be associated with a former MGP operated by NSP-Minnesota or prior companies. NSP-Minnesota removed impacted soils and other materials from the right-of-way and commenced an investigation of the historic MGP and adjacent properties (the Fargo MGP Site). NSP-Minnesota has recommended that targeted source removal of impacted soils and historic MGP infrastructure should be performed. The North Dakota Department of Health approved NSP-Minnesota’s proposed cleanup plan in January 2017. The timing and final scope of remediation is dependent on whether reasonable access is provided to NSP-Minnesota to perform and implement the approved cleanup plan. NSP-Minnesota has also initiated insurance recovery litigation in North Dakota. The U.S. District Court for the District of North Dakota agreed to the parties’ request for a stay of the litigation until September 2017.

As of June 30, 2017 and Dec. 31, 2016, NSP-Minnesota had recorded a liability of $16.4 million and $11.3 million, respectively, for the Fargo MGP Site. The current cost estimate for the remediation of the site is approximately $23.0 million, of which approximately $6.6 million has been spent. In December 2015, the North Dakota Public Service Commission (NDPSC) approved NSP-Minnesota’s request to defer costs associated with the Fargo MGP Site, resulting in deferral of all investigation and response costs with the exception of approximately 12 percent allocable to the Minnesota jurisdiction. Uncertainties related to the liability recognized include obtaining access to perform the approved remediation (including the prospective purchase of the historic MGP property), final designs that will be developed to implement the approved cleanup plan and the potential for contributions from entities that may be identified as PRPs.

Other MGP and Landfill Sites — Xcel Energy is currently involved in investigating and/or remediating several other MGP and landfill sites. Xcel Energy has identified ten sites across its service territories in addition to the sites in Ashland, Wis. and Fargo, N.D., where former MGP or landfill disposal activities have or may have resulted in site contamination and are under current investigation and/or remediation. At some or all of these sites, there are other parties that may have responsibility for some portion of any remediation. Xcel Energy anticipates that the majority of the investigation or remediation at these sites will continue through at least 2018. Xcel Energy had accrued $2.9 million and $2.0 million for these sites at June 30, 2017 and Dec. 31, 2016, respectively. There may be insurance recovery and/or recovery from other PRPs to offset any costs incurred. Xcel Energy anticipates that any significant amounts incurred will be recovered from customers.

Environmental Requirements

Water and Waste

Federal Clean Water Act (CWA) Waters of the United States Rule —In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) published a final rule that significantly expands the types of water bodies regulated under the CWA and broadens the scope of waters subject to federal jurisdiction. The final rule will subject more utility projects to federal CWA jurisdiction, thereby potentially delaying the siting of new generation projects, pipelines, transmission lines and distribution lines, as well as increasing project costs and expanding permitting and reporting requirements. In October 2015, the U.S. Court of Appeals for the Sixth Circuit issued a nationwide stay of the final rule and subsequently ruled that it, rather than the federal district courts, had jurisdiction over challenges to the rule.  In January 2017, the U.S. Supreme Court agreed to resolve the dispute as to which court should hear challenges to the rule. A ruling is expected by the end of 2017.

16

In February 2017, President Trump issued an executive order requiring the EPA and the Corps to review and revise the final rule. On June 27, 2017, the agencies issued a proposed rule that rescinds the 2015 final rule and reinstates the prior 1986 definition of “Water of the U.S.”

Air

Greenhouse Gas (GHG) Emission Standard for Existing Sources (Clean Power Plan or CPP) — In 2015, the EPA issued its final rule for existing power plants.  Among other things, the rule requires that state plans include enforceable measures to ensure emissions from existing power plants achieve the EPA’s state-specific interim (2022-2029) and final (2030 and thereafter) emission performance targets. 

The CPP was challenged by multiple parties in the D.C. Circuit Court.  In February 2016, the U.S. Supreme Court issued an order staying the final CPP rule. In September 2016, the D.C. Circuit Court heard oral arguments in the consolidated challenges to the CPP. The stay will remain in effect until the D.C. Circuit Court reaches its decision and the U.S. Supreme Court either declines to review the lower court’s decision or reaches a decision of its own.

In March 2017, President Trump signed an executive order requiring the EPA Administrator to review the CPP rule and if appropriate, publish proposed rules suspending, revising or rescinding it. Accordingly, the EPA has requested that the D.C. Circuit Court hold the litigation in abeyance until the EPA completes its work under the executive order. The D.C. Circuit granted the EPA’s request to hold the litigation in abeyance until June 27, 2017, and is considering briefs by the parties on whether the court should remand the challenges to the EPA rather than holding them in abeyance, to determine whether and how the court continues or ends the stay that currently applies to the CPP. On June 9, 2017, the EPA submitted a proposed rule to the Office of Management and Budget entitled “Review of the Clean Power Plan.”

Regional Haze Rules — The regional haze program is designed to address widespread haze that results from emissions from a multitude of sources. The Best Available Retrofit Technology (BART) requirements of the EPA’s regional haze rules require the installation and operation of emission controls for industrial facilities emitting air pollutants that reduce visibility in national parks and wilderness areas. Under BART, regional haze plans identify facilities that will have to reduce Sulfur Dioxide (SO₂₎, Nitrogen Oxide (NOx) and particulate matter emissions and set emission limits for those facilities. BART requirements can also be met through participation in interstate emission trading programs such as the Clean Air Interstate Rule (CAIR) and its successor, Cross-State Air Pollution Rule (CSAPR). The regional haze plans developed by Minnesota and Colorado have been fully approved and are being implemented in those states. States are required to revise their plans every ten years. The next plans for Minnesota and Colorado will be due in 2021. Texas’ first regional haze plan is still undergoing federal review as described below. President Trump’s Administration has not yet taken any public position regarding its views of the proposed and final regional haze regulations affecting SPS facilities in Texas. 

Actions affecting Harrington Units: Texas developed a State Implementation Plan (SIP) that finds the CAIR equal to BART for electric generating units. As a result, no additional controls beyond CAIR compliance would be required. In 2014, the EPA proposed to approve the BART portion of the SIP, with substitution of CSAPR compliance for Texas’ reliance on CAIR. In January 2016, the EPA adopted a final rule that defers its approval of CSAPR compliance as BART until the EPA considers further adjustments to CSAPR emission budgets under the D.C. Circuit Court’s remand of the Texas SO₂ emission budgets. In June 2016, the EPA issued a memorandum which allows Texas to voluntarily adopt the CSAPR emission budgets limiting annual SO₂ and NOx emissions and rely on those emission budgets to satisfy Texas’ BART obligations under the regional haze rules. The Texas Commission on Environmental Quality has not utilized this option. The EPA then published a proposed rule in January 2017 that could have the effect of requiring installation of dry scrubbers to reduce SO₂ emissions from Harrington Units 1 and 2. Investment costs associated with dry scrubbers for Harrington Units 1 and 2 could be approximately $400 million. The EPA’s deadline to issue a final rule for Texas is September 2017.

Actions affecting Tolk units: In January 2016, the EPA adopted a final rule establishing a federal implementation plan for the state of Texas, which imposed SO₂ emission limitations that reflect the installation of dry scrubbers on Tolk Units 1 and 2, with compliance required by February 2021. Investment costs associated with dry scrubbers could be approximately $600 million. SPS appealed the EPA’s decision and requested a stay of the final rule. The United States Court of Appeals for the Fifth Circuit (Fifth Circuit) granted the stay and decided that they are the appropriate venue for this case. In March 2017, the Fifth Circuit remanded the rule to the EPA for reconsideration, while leaving the stay in effect. The Fifth Circuit is now holding the case in abeyance until the EPA completes its reconsideration of the rule. It is likely that Texas and other affected entities including SPS would continue to challenge the determinations to date.  The risk of these controls being imposed along with the risk of investments to provide cooling water to Tolk have caused SPS to seek to decrease the remaining depreciable life of the Tolk units.

17

Revisions to the National Ambient Air Quality Standard (NAAQS) for Ozone — In 2015, the EPA revised the NAAQS for ozone by lowering the eight-hour standard from 75 parts per billion (ppb) to 70 ppb. In areas where Xcel Energy operates, current monitored air quality concentrations comply with the new standard in the Twin Cities Metropolitan Area in Minnesota and meet the 70 ppb level in the Texas panhandle. In documents issued with the new standard, the EPA projects that both areas will meet the new standard. The Denver Metropolitan Area is currently not meeting the prior ozone standard and will therefore not meet the new, more stringent standard, however PSCo’s scheduled retirement of coal fired plants in Denver that began in 2011 and will be completed in August 2017, should help in any plan to mitigate non-attainment. In June 2017, the EPA announced that it is delaying designations of nonattainment areas under the 2015 ozone NAAQS to October 2018 to allow it to complete its review of the 2015 ozone NAAQS.

Legal Contingencies

Xcel Energy is involved in various litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on Xcel Energy’s financial statements. Unless otherwise required by GAAP, legal fees are expensed as incurred.

Employment, Tort and Commercial Litigation

Gas Trading Litigation — e prime, inc. (e prime) is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003.  Thirteen lawsuits were commenced against e prime and Xcel Energy (and NSP-Wisconsin, in two instances) between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices.

The cases were consolidated in U.S. District Court in Nevada. Five of the cases have since been settled and seven remain active, which includes one multi-district litigation (MDL) matter consisting of a Colorado class (Breckenridge), a Wisconsin class (NSP-Wisconsin), a Kansas class, and two other cases identified as “Sinclair Oil” and “Farmland.” In November 2016, the MDL judge dismissed e prime and Xcel Energy from the Farmland lawsuit, and Farmland has appealed the dismissal. Motions for summary judgment were filed by defendants, including e prime, in all of the remaining lawsuits. In March 2017, the U.S. District Court issued an order dismissing the claims against e prime in the Sinclair Oil lawsuit and denied plaintiffs motions for class certification in the other lawsuits. The U.S. District Court did not grant e prime’s summary judgment motions in the Wisconsin or Colorado cases. There are currently additional motions brought by e prime for reconsideration and summary judgment pending in the U.S. District Court. Xcel Energy, NSP-Wisconsin and e prime have concluded that a loss is remote.

Line Extension Disputes — In December 2015, Development Recovery Company (DRC) filed a lawsuit in Denver State Court, stating PSCo failed to award proper allowances and refunds for line extensions to new developments pursuant to the terms of electric and gas service agreements entered into by PSCo and various developers. The dispute involves claims by over fifty developers. In May 2016, the district court granted PSCo’s motion to dismiss the lawsuit, concluding that jurisdiction over this dispute resides with the CPUC. In June 2016, DRC appealed the district court’s dismissal of the lawsuit, and the Colorado Court of Appeals affirmed the lower court decision in favor of PSCo. In July 2017, DRC filed a petition to appeal the decision with the Colorado Supreme Court. It is uncertain whether the Colorado Supreme Court will grant the petition. DRC also brought a proceeding before the CPUC as assignee on behalf of two developers, Ryland Homes and Richmond Homes of Colorado. In March 2016, the ALJ issued an order rejecting DRC’s claims for additional allowances and refunds. In June 2016, the ALJ’s determination was approved by the CPUC. DRC did not file a request for reconsideration before the CPUC contesting the decision, but filed an appeal in Denver District Court in August 2016. DRC has requested a hearing for oral arguments, which has yet to be granted or set by the Denver District Court.

PSCo has concluded that a loss is remote with respect to this matter as the service agreements were developed to implement CPUC approved tariffs and PSCo has complied with the tariff provisions. Also, if a loss were sustained, PSCo believes it would be allowed to recover these costs through traditional regulatory mechanisms. The amount or range in dispute is presently unknown and no accrual has been recorded for this matter.

18

7. Borrowings and Other Financing Instruments

Short-Term Borrowings

Money Pool— Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that allows for short-term investments in and borrowings between the utility subsidiaries. NSP-Wisconsin does not participate in the money pool. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc. The money pool balances are eliminated in consolidation.

Commercial Paper — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under their credit facilities. Commercial paper outstanding for Xcel Energy was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended    June 30, 2017			Year Ended    Dec. 31, 2016
Borrowing limit	$	2,750		$	2,750
Amount outstanding at period end	784			392
Average amount outstanding	778			485
Maximum amount outstanding	1,247			1,183
Weighted average interest rate, computed on a daily basis	1.28		%	0.74		%
Weighted average interest rate at period end	1.49			0.95

Letters of Credit— Xcel Energy Inc. and its subsidiaries use letters of credit, generally with terms of one year, to provide financial guarantees for certain operating obligations. At June 30, 2017 and Dec. 31, 2016, there were $14 million and $19 million, respectively, of letters of credit outstanding under the credit facilities. The contract amounts of these letters of credit approximate their fair value and are subject to fees.

Credit Facilities —In order to use their commercial paper programs to fulfill short-term funding needs, Xcel Energy Inc. and its utility subsidiaries must have revolving credit facilities in place at least equal to the amount of their respective commercial paper borrowing limits and cannot issue commercial paper in an aggregate amount exceeding available capacity under these credit facilities. The lines of credit provide short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

At June 30, 2017, Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,000	$	549	$	451
PSCo	700		3		697
NSP-Minnesota	500		91		409
SPS	400		109		291
NSP-Wisconsin	150		46		104
Total	$	2,750	$	798	$	1,952

^(a)  These credit facilities expire in June 2021.

^(b)  Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the respective credit facilities. Xcel Energy Inc. and its subsidiaries had no direct advances on the credit facilities outstanding at June 30, 2017 and Dec. 31, 2016.

Long-Term Borrowings

PSCo issued $400 million of 3.80 percent first mortgage bonds due June 15, 2047.

19

8. Fair Value of Financial Assets and Liabilities

Fair Value Measurements

The accounting guidance for fair value measurements and disclosures provides a single definition of fair value and requires certain disclosures about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance. The three levels in the hierarchy are as follows:

Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

Level 2 — Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include the following:

Cash equivalents— The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted net asset value (NAV).

Investments in equity securities and other funds— Equity securities are valued using quoted prices in active markets. The fair values for commingled funds are measured using NAVs, which take into consideration the value of underlying fund investments, as well as the other accrued assets and liabilities of a fund, in order to determine a per-share market value. The investments in commingled funds may be redeemed for NAV with proper notice. Proper notice varies by fund and can range from daily with one or two days notice to annually with 90 days notice. Private equity investments require approval of the fund for any unscheduled redemption, and such redemptions may be approved or denied by the fund at its sole discretion. Unscheduled distributions from real estate investments may be redeemed with proper notice, which is typically quarterly with 45-90 days notice; however, withdrawals from real estate investments may be delayed or discounted as a result of fund illiquidity.

Investments in debt securities— Fair values for debt securities are determined by a third party pricing service using recent trades and observable spreads from benchmark interest rates for similar securities.

Interest rate derivatives— The fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives— The methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations, and are generally assigned a Level 2 classification. When contractual settlements extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable forecasts of long-term forward prices and volatilities on a valuation is evaluated, and may result in Level 3 classification.

Electric commodity derivatives held by NSP-Minnesota and SPS include transmission congestion instruments, generally referred to as financial transmission rights (FTRs). FTRs purchased from a RTO are financial instruments that entitle or obligate the holder to monthly revenues or charges based on transmission congestion across a given transmission path. The value of an FTR is derived from, and designed to offset, the cost of transmission congestion. In addition to overall transmission load, congestion is also influenced by the operating schedules of power plants and the consumption of electricity pertinent to a given transmission path. Unplanned plant outages, scheduled plant maintenance, changes in the relative costs of fuels used in generation, weather and overall changes in demand for electricity can each impact the operating schedules of the power plants on the transmission grid and the value of an FTR. The valuation process for FTRs utilizes complex iterative modeling to predict the impacts of forecasted changes in these drivers of transmission system congestion on the historical pricing of FTR purchases.

20

If forecasted costs of electric transmission congestion increase or decrease for a given FTR path, the value of that particular FTR instrument will likewise increase or decrease. Fair value measurements for FTRs have been assigned a Level 3 given the limited observability of management’s forecasts for several of the inputs to this complex valuation model. Non-trading monthly FTR settlements are included in fuel and purchased energy cost recovery mechanisms as applicable in each jurisdiction, and therefore changes in the fair value of the yet to be settled portions of most FTRs are deferred as a regulatory asset or liability. Given this regulatory treatment and the limited magnitude of FTRs, the numerous unobservable quantitative inputs to the complex model used for valuation of FTRs are insignificant to the consolidated financial statements of Xcel Energy.

Non-Derivative Instruments Fair Value Measurements

Nuclear Decommissioning Fund

The Nuclear Regulatory Commission (NRC) requires NSP-Minnesota to maintain a portfolio of investments to fund the costs of decommissioning its nuclear generating plants. Together with all accumulated earnings or losses, the assets of the nuclear decommissioning fund are legally restricted for the decommissioning the Monticello and PI nuclear generating plants. The fund contains cash equivalents, debt securities, equity securities and other investments – all classified as available-for-sale. NSP-Minnesota plans to reinvest matured securities until decommissioning begins. NSP-Minnesota uses the MPUC approved asset allocation for the escrow and investment targets by asset class for both the escrow and qualified trust.

NSP-Minnesota recognizes the costs of funding the decommissioning of its nuclear generating plants over the lives of the plants, assuming rate recovery of all costs. Given the purpose and legal restrictions on the use of nuclear decommissioning fund assets, realized and unrealized gains on fund investments over the life of the fund are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Consequently, any realized and unrealized gains and losses on securities in the nuclear decommissioning fund, including any other-than-temporary impairments, are deferred as a component of the regulatory asset for nuclear decommissioning.

Unrealized gains for the nuclear decommissioning fund were $462.3 million and $378.6 million at June 30, 2017 and Dec. 31, 2016, respectively, and unrealized losses and amounts recorded as other-than-temporary impairments were $34.2 million and $46.9 million at June 30, 2017 and Dec. 31, 2016, respectively.

The following tables present the cost and fair value of Xcel Energy’s non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund at June 30, 2017 and Dec. 31, 2016:

	June 30, 2017
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Investments Measured at NAV (b)		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	10,990	$	10,990	$	—	$	—	$	—	$	10,990
Commingled funds:
Non U.S. equities	280,608		191,881		—		—		106,085		297,966
Emerging market debt funds	96,008		—		—		—		103,736		103,736
Commodity funds	106,571		—		—		—		82,897		82,897
Private equity investments	138,889		—		—		—		195,491		195,491
Real estate	131,270		—		—		—		195,515		195,515
Other commingled funds	131,243		—		—		—		141,918		141,918
Debt securities:
Government securities	38,319		—		37,844		—		—		37,844
U.S. corporate bonds	141,510		—		142,330		—		—		142,330
Non U.S. corporate bonds	24,386		—		24,859		—		—		24,859
Equity securities:
U.S. equities	287,425		526,581		—		—		—		526,581
Non U.S. equities	171,695		226,868		—		—		—		226,868
Total	$	1,558,914	$	956,320	$	205,033	$	—	$	825,642	$	1,986,995

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $133.2 million of equity investments in unconsolidated subsidiaries and $111.4 million of rabbi trust assets and miscellaneous investments.

^(b)  Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

21

	Dec. 31, 2016
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Investments Measured at NAV (b)		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	20,379	$	20,379	$	—	$	—	$	—	$	20,379
Commingled funds:
Non U.S. equities	260,877		133,126		—		—		112,233		245,359
Emerging market debt funds	93,597		—		—		—		97,543		97,543
Commodity funds	106,571		—		—		—		92,091		92,091
Private equity investments	132,190		—		—		—		190,462		190,462
Real estate	128,630		—		—		—		187,647		187,647
Other commingled funds	151,048		—		—		—		159,489		159,489
Debt securities:
Government securities	32,764		—		31,965		—		—		31,965
U.S. corporate bonds	104,913		—		105,772		—		—		105,772
Non U.S. corporate bonds	21,751		—		21,672		—		—		21,672
Municipal bonds	13,609		—		13,786		—		—		13,786
Mortgage-backed securities	2,785		—		2,816		—		—		2,816
Equity securities:
U.S. equities	270,779		473,400		—		—		—		473,400
Non U.S. equities	189,100		218,381		—		—		—		218,381
Total	$	1,528,993	$	845,286	$	176,011	$	—	$	839,465	$	1,860,762

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $132.8 million of equity investments in unconsolidated subsidiaries and $98.3 million of rabbi trust assets and miscellaneous investments.

^(b)  Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

For the three and six months ended June 30, 2017 and 2016 there were no Level 3 nuclear decommissioning fund investments and no transfers of amounts between levels.

The following table summarizes the final contractual maturity dates of the debt securities in the nuclear decommissioning fund, by asset class, at June 30, 2017:

	Final Contractual Maturity
(Thousands of Dollars)	Due in 1 Year or Less		Due in 1 to 5 Years		Due in 5 to 10 Years		Due after 10 Years		Total
Government securities	$	—	$	2,770	$	6,497	$	28,577	$	37,844
U.S. corporate bonds	2,824		44,843		78,518		16,145		142,330
Non U.S. corporate bonds	—		10,964		10,851		3,044		24,859
Debt securities	$	2,824	$	58,577	$	95,866	$	47,766	$	205,033

Rabbi Trusts

In June 2016, Xcel Energy established rabbi trusts to provide partial funding for future distributions of its supplemental executive retirement plan and deferred compensation plan. The following tables present the cost and fair value of the assets held in rabbi trusts at June 30, 2017 and Dec. 31, 2016:

	June 30, 2017
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	11,214	$	11,214	$	—	$	—	$	11,214
Mutual funds	46,171		47,380		—		—		47,380
Total	$	57,385	$	58,594	$	—	$	—	$	58,594

22

	Dec. 31, 2016
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	47,831	$	47,831	$	—	$	—	$	47,831
Mutual funds	1,663		1,901		—		—		1,901
Total	$	49,494	$	49,732	$	—	$	—	$	49,732

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

Derivative Instruments Fair Value Measurements

Xcel Energy enters into derivative instruments, including forward contracts, futures, swaps and options, for trading purposes and to manage risk in connection with changes in interest rates, utility commodity prices and vehicle fuel prices.

Interest Rate Derivatives — Xcel Energy enters into various instruments that effectively fix the interest payments on certain floating rate debt obligations or effectively fix the yield or price on a specified benchmark interest rate for an anticipated debt issuance for a specific period. These derivative instruments are generally designated as cash flow hedges for accounting purposes.

At June 30, 2017, accumulated other comprehensive losses related to interest rate derivatives included $3.0 million of net losses expected to be reclassified into earnings during the next 12 months as the related hedged interest rate transactions impact earnings, including forecasted amounts for unsettled hedges, as applicable.

Wholesale and Commodity Trading Risk — Xcel Energy Inc.’s utility subsidiaries conduct various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. Xcel Energy’s risk management policy allows management to conduct these activities within guidelines and limitations as approved by its risk management committee, which is made up of management personnel not directly involved in the activities governed by this policy.

Commodity Derivatives — Xcel Energy enters into derivative instruments to manage variability of future cash flows from changes in commodity prices in its electric and natural gas operations, as well as for trading purposes. This could include the purchase or sale of energy or energy-related products, natural gas to generate electric energy, natural gas for resale, FTRs, vehicle fuel and weather derivatives.

At June 30, 2017, Xcel Energy had various vehicle fuel contracts designated as cash flow hedges extending through December 2018. Xcel Energy enters into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers, but may not be designated as qualifying hedging transactions. Changes in the fair value of non-trading commodity derivative instruments are recorded in other comprehensive income or deferred as a regulatory asset or liability. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms. Xcel Energy recorded immaterial amounts to income related to the ineffectiveness of cash flow hedges for the three and six months ended June 30, 2017 and 2016.

At June 30, 2017, net gains related to commodity derivative cash flow hedges recorded as a component of accumulated other comprehensive losses included immaterial amounts expected to be reclassified into earnings during the next 12 months as the hedged transactions occur.

Additionally, Xcel Energy enters into commodity derivative instruments for trading purposes not directly related to commodity price risks associated with serving its electric and natural gas customers. Changes in the fair value of these commodity derivatives are recorded in electric operating revenues, net of amounts credited to customers under margin-sharing mechanisms.

23

The following table details the gross notional amounts of commodity forwards, options and FTRs at June 30, 2017 and Dec. 31, 2016:

(Amounts in Thousands) (a)(b)	June 30, 2017	Dec. 31, 2016
Megawatt hours of electricity	101,225	46,773
Million British thermal units of natural gas	66,974	121,978
Gallons of vehicle fuel	360	—

^(a)  Amounts are not reflective of net positions in the underlying commodities.

^(b)  Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

The following tables detail the impact of derivative activity during the three and six months ended June 30, 2017 and 2016, on accumulated other comprehensive loss, regulatory assets and liabilities, and income:

	Three Months Ended June 30, 2017
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax (Gains) Losses Reclassified into Income During the Period from:								Pre-Tax Gains Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss				Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	1,319		(a)	$	—			$	—
Vehicle fuel and other commodity	43		—			(5		)	(b)	—				—
Total	$	43	$	—		$	1,314			$	—			$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—			$	—			$	5,785	(c)
Electric commodity	—		(1,299		)	—				(2,315		)	(d)	—
Natural gas commodity	—		(1,685		)	—				—				—
Total	$	—	$	(2,984	)	$	—			$	(2,315	)		$	5,785

	Six Months Ended June 30, 2017
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax (Gains) Losses Reclassified into Income During the Period from:								Pre-Tax Gains (Losses) Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss				Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	2,678		(a)	$	—			$	—
Vehicle fuel and other commodity	43		—			(5		)	(b)	—				—
Total	$	43	$	—		$	2,673			$	—			$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—			$	—			$	6,786		(c)
Electric commodity	—		(505		)	—				(6,313		)	(d)	—
Natural gas commodity	—		(7,846		)	—				1,075			(e)	(4,070		)	(e)
Total	$	—	$	(8,351	)	$	—			$	(5,238	)		$	2,716

24

	Three Months Ended June 30, 2016
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax Losses Reclassified into Income During the Period from:						Pre-Tax Gains Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	1,483	(a)	$	—		$	—
Vehicle fuel and other commodity	19		—			47		(b)	—			—
Total	$	19	$	—		$	1,530		$	—		$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—		$	—		$	481	(c)
Electric commodity	—		(705		)	—			16,642		(d)	—
Natural gas commodity	—		6,063			—			—			25		(e)
Total	$	—	$	5,358		$	—		$	16,642		$	506

	Six Months Ended June 30, 2016
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax Losses Reclassified into Income During the Period from:						Pre-Tax Gains (Losses) Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	2,968	(a)	$	—		$	—
Vehicle fuel and other commodity	13		—			104		(b)	—			—
Total	$	13	$	—		$	3,072		$	—		$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—		$	—		$	1,490		(c)
Electric commodity	—		(970		)	—			27,533		(d)	—
Natural gas commodity	—		3,361			—			11,666		(e)	(4,999		)	(e)
Total	$	—	$	2,391		$	—		$	39,199		$	(3,509	)

^(a)  Amounts are recorded to interest charges.

^(b)  Amounts are recorded to operating and maintenance (O&M) expenses.

^(c)  Amounts are recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

^(d)  Amounts are recorded to electric fuel and purchased power. These derivative settlement gain and loss amounts are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

^(e)  Certain derivatives are utilized to mitigate natural gas price risk for electric generation and are recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Amounts for the three and six months ended June 30, 2017 included no settlement gains or losses and $0.9 million of settlement gains, respectively. Amounts for the three and six months ended June 30, 2016 included an immaterial amount of settlement losses. The remaining derivative settlement gains and losses for the three and six months ended June 30, 2017 and 2016 relate to natural gas operations and are recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

Xcel Energy had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 2017 and 2016. Therefore, no gains or losses from fair value hedges or related hedged transactions were recognized for these periods.

Consideration of Credit Risk and Concentrations — Xcel Energy continuously monitors the creditworthiness of the counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Given this assessment, as well as an assessment of the impact of Xcel Energy’s own credit risk when determining the fair value of derivative liabilities, the impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented in the consolidated balance sheets.

Xcel Energy Inc. and its subsidiaries employ additional credit risk control mechanisms when appropriate, such as letters of credit, parental guarantees, standardized master netting agreements and termination provisions that allow for offsetting of positive and negative exposures. Credit exposure is monitored and, when necessary, the activity with a specific counterparty is limited until credit enhancement is provided.

25

Xcel Energy’s utility subsidiaries’ most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to their wholesale, trading and non-trading commodity activities. At June 30, 2017, two of Xcel Energy’s 10 most significant counterparties for these activities, comprising $28.1 million or 12 percent of this credit exposure, had investment grade credit ratings from Standard & Poor’s, Moody’s or Fitch Ratings. Eight of the 10 most significant counterparties, comprising $75.7 million or 32 percent of this credit exposure, were not rated by these external agencies, but based on Xcel Energy’s internal analysis, had credit quality consistent with investment grade. All ten of these significant counterparties are municipal or cooperative electric entities or other utilities.

Credit Related Contingent Features—Contract provisions for derivative instruments that the utility subsidiaries enter, including those accounted for as normal purchase-normal sale contracts and therefore not reflected on the balance sheet, may require the posting of collateral or settlement of the contracts for various reasons, including if the applicable utility subsidiary is unable to maintain its credit ratings. At June 30, 2017 and Dec. 31, 2016, there were no derivative instruments in a liability position with underlying contract provisions that required the posting of collateral or settlement of applicable outstanding contracts if the credit ratings of Xcel Energy Inc.’s utility subsidiaries were downgraded below investment grade.

Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that a given utility subsidiary’s ability to fulfill its contractual obligations is reasonably expected to be impaired. Xcel Energy had no collateral posted related to adequate assurance clauses in derivative contracts as of June 30, 2017 and Dec. 31, 2016.

Recurring Fair Value Measurements — The following table presents for each of the fair value hierarchy levels, Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis at June 30, 2017:

	June 30, 2017
	Fair Value						Fair Value Total		Counterparty Netting (b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	25	$	—	$	25	$	(25	)	$	—
Other derivative instruments:
Commodity trading	2,974		13,383		2		16,359		(8,958		)	7,401
Electric commodity	—		—		68,069		68,069		(4,048		)	64,021
Natural gas commodity	—		1,439		—		1,439		—			1,439
Total current derivative assets	$	2,974	$	14,847	$	68,071	$	85,892	$	(13,031	)	72,861
PPAs (a)												5,626
Current derivative instruments												$	78,487
Noncurrent derivative assets
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	14	$	—	$	14	$	—		$	14
Other derivative instruments:
Commodity trading	250		30,686		5,215		36,151		(7,307		)	28,844
Total noncurrent derivative assets	$	250	$	30,700	$	5,215	$	36,165	$	(7,307	)	28,858
PPAs (a)												21,552
Noncurrent derivative instruments												$	50,410

26

	June 30, 2017
	Fair Value						Fair Value Total		Counterparty Netting (b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	—	$	—	$	—	$	(25	)	$	(25	)
Other derivative instruments:
Commodity trading	3,050		11,443		1		14,494		(9,280		)	5,214
Electric commodity	—		—		4,048		4,048		(4,048		)	—
Total current derivative liabilities	$	3,050	$	11,443	$	4,049	$	18,542	$	(13,353	)	5,189
PPAs (a)												22,830
Current derivative instruments												$	28,019
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	98	$	22,861	$	—	$	22,959	$	(10,522	)	$	12,437
Total noncurrent derivative liabilities	$	98	$	22,861	$	—	$	22,959	$	(10,522	)	12,437
PPAs (a)												123,818
Noncurrent derivative instruments												$	136,255

^(a)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

^(b)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2017. At June 30, 2017, derivative assets and liabilities include no obligations to return cash collateral and the rights to reclaim cash collateral of $3.5 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

The following table presents for each of the fair value hierarchy levels, Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis at Dec. 31, 2016:

	Dec. 31, 2016
	Fair Value						Fair Value Total		Counterparty Netting(b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Other derivative instruments:
Commodity trading	$	13,179	$	14,105	$	—	$	27,284	$	(20,637	)	$	6,647
Electric commodity	—		—		19,251		19,251		(1,976		)	17,275
Natural gas commodity	—		8,839		—		8,839		—			8,839
Total current derivative assets	$	13,179	$	22,944	$	19,251	$	55,374	$	(22,613	)	32,761
PPAs (a)												5,463
Current derivative instruments												$	38,224
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	100	$	31,029	$	—	$	31,129	$	(7,323	)	$	23,806
Natural gas commodity	—		1,652		—		1,652		—			1,652
Total noncurrent derivative assets	$	100	$	32,681	$	—	$	32,781	$	(7,323	)	25,458
PPAs (a)												24,731
Noncurrent derivative instruments												$	50,189

27

	Dec. 31, 2016
	Fair Value						Fair Value Total		Counterparty Netting(b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Other derivative instruments:
Commodity trading	$	13,787	$	11,320	$	22	$	25,129	$	(20,974	)	$	4,155
Electric commodity	—		—		1,976		1,976		(1,976		)	—
Total current derivative liabilities	$	13,787	$	11,320	$	1,998	$	27,105	$	(22,950	)	4,155
PPAs (a)												22,804
Current derivative instruments												$	26,959
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	89	$	23,424	$	—	$	23,513	$	(10,727	)	$	12,786
Total noncurrent derivative liabilities	$	89	$	23,424	$	—	$	23,513	$	(10,727	)	12,786
PPAs (a)												135,360
Noncurrent derivative instruments												$	148,146

^(a)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

^(b)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2016. At Dec. 31, 2016, derivative assets and liabilities include no obligations to return cash collateral and rights to reclaim cash collateral of $3.7 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

The following table presents the changes in Level 3 commodity derivatives for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30
(Thousands of Dollars)	2017			2016
Balance at April 1	$	5,836		$	6,854
Purchases	76,281			29,826
Settlements	(22,272		)	(14,111		)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	6,016			(18		)
Net gains recognized as regulatory assets and liabilities	3,376			1,966
Balance at June 30	$	69,237		$	24,517
	Six Months Ended June 30
(Thousands of Dollars)	2017			2016
Balance at Jan. 1	$	17,253		$	18,028
Purchases	80,073			31,670
Settlements	(42,074		)	(26,161		)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	5,221			(43		)
Net gains recognized as regulatory assets and liabilities	8,764			1,023
Balance at June 30	$	69,237		$	24,517

^(a)  These amounts relate to commodity derivatives held at the end of the period.

Xcel Energy recognizes transfers between levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for the three and six months ended June 30, 2017 and 2016.

28

Fair Value of Long-Term Debt

As of June 30, 2017 and Dec. 31, 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:

	June 30, 2017				Dec. 31, 2016
(Thousands of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	14,597,178	$	15,879,594	$	14,450,247	$	15,513,209

The fair value of Xcel Energy’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. The fair value estimates are based on information available to management as of June 30, 2017 and Dec. 31, 2016, and given the observability of the inputs to these estimates, the fair values presented for long-term debt have been assigned a Level 2.

9. Other Income, Net

Other income, net consisted of the following:

	Three Months Ended June 30						Six Months Ended June 30
(Thousands of Dollars)	2017			2016			2017			2016
Interest income	$	2,107		$	984		$	5,907		$	5,054
Other nonoperating income	1,523			1,496			5,168			2,176
Insurance policy expense	(1,022		)	(920		)	(2,021		)	(1,420		)
Other income, net	$	2,608		$	1,560		$	9,054		$	5,810

10. Segment Information

The regulated electric utility operating results of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS, as well as the regulated natural gas utility operating results of NSP-Minnesota, NSP-Wisconsin and PSCo are each separately and regularly reviewed by Xcel Energy’s chief operating decision maker. Xcel Energy evaluates performance by each utility subsidiary based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment.

Xcel Energy has the following reportable segments: regulated electric utility, regulated natural gas utility and all other.

• Xcel Energy’s regulated electric utility segment generates, transmits and distributes electricity primarily in portions of Minnesota, Wisconsin, Michigan, North Dakota, South Dakota, Colorado, Texas and New Mexico. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. Regulated electric utility also includes commodity trading operations.

• Xcel Energy’s regulated natural gas utility segment transports, stores and distributes natural gas primarily in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado.

• Revenues from operating segments not included above are below the necessary quantitative thresholds and are therefore included in the all other category. Those primarily include steam revenue, appliance repair services, nonutility real estate activities, revenues associated with processing solid waste into refuse-derived fuel and investments in rental housing projects that qualify for low-income housing tax credits.

Xcel Energy had equity investments in unconsolidated subsidiaries of $133.2 million and $132.8 million as of June 30, 2017 and Dec. 31, 2016, respectively, included in the regulated natural gas utility segment.

Asset and capital expenditure information is not provided for Xcel Energy’s reportable segments because as an integrated electric and natural gas utility, Xcel Energy operates significant assets that are not dedicated to a specific business segment, and reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

To report income from operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment. However, some costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators. A general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

29

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended June 30, 2017
Operating revenues from external customers	$	2,338,017	$	289,839	$	17,072		$	—		$	2,644,928
Intersegment revenues	433		285		—			(718		)	—
Total revenues	$	2,338,450	$	290,124	$	17,072		$	(718	)	$	2,644,928
Net income (loss)	$	227,562	$	13,166	$	(13,472	)	$	—		$	227,256

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended June 30, 2016
Operating revenues from external customers	$	2,224,142	$	258,899	$	16,808		$	—		$	2,499,849
Intersegment revenues	421		241		—			(662		)	—
Total revenues	$	2,224,563	$	259,140	$	16,808		$	(662	)	$	2,499,849
Net income (loss)	$	205,440	$	11,933	$	(20,578	)	$	—		$	196,795

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Six Months Ended June 30, 2017
Operating revenues from external customers	$	4,637,077	$	915,542	$	38,731		$	—		$	5,591,350
Intersegment revenues	730		549		—			(1,279		)	—
Total revenues	$	4,637,807	$	916,091	$	38,731		$	(1,279	)	$	5,591,350
Net income (loss)	$	421,715	$	76,093	$	(31,275	)	$	—		$	466,533

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Six Months Ended June 30, 2016
Operating revenues from external customers	$	4,409,261	$	824,588	$	38,273		$	—		$	5,272,122
Intersegment revenues	756		528		—			(1,284		)	—
Total revenues	$	4,410,017	$	825,116	$	38,273		$	(1,284	)	$	5,272,122
Net income (loss)	$	383,677	$	90,271	$	(35,841	)	$	—		$	438,107

11. Earnings Per Share

Basic earnings per share (EPS) was computed by dividing the earnings available to Xcel Energy Inc.’s common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS was computed by dividing the earnings available to Xcel Energy Inc.’s common shareholders by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock (i.e., common stock equivalents) were settled. The weighted average number of potentially dilutive shares outstanding used to calculate Xcel Energy Inc.’s diluted EPS is calculated using the treasury stock method.

Common Stock Equivalents— Xcel Energy Inc. currently has common stock equivalents related to certain equity awards in share-based compensation arrangements.

Common stock equivalents causing dilutive impact to EPS include commitments to issue common stock related to time based equity compensation awards.

Stock equivalent units granted to Xcel Energy Inc.’s Board of Directors are included in common shares outstanding upon grant date as there is no further service, performance or market condition associated with these awards. Restricted stock, granted to settle amounts due to certain employees under the Xcel Energy Inc. Executive Annual Incentive Award Plan, is included in common shares outstanding when granted.

30

Share-based compensation arrangements for which there is currently no dilutive impact to EPS include the following:

• Equity awards subject to a performance condition; included in common shares outstanding when all necessary conditions for settlement have been satisfied by the end of the reporting period.

• Liability awards subject to a performance condition; any portions settled in shares are included in common shares outstanding upon settlement.

The dilutive impact of common stock equivalents affecting EPS was as follows:

	Three Months Ended June 30, 2017					Three Months Ended June 30, 2016
(Amounts in thousands, except per share data)	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Net income	$	227,256	—	—		$	196,795	—	—
Basic EPS:
Earnings available to common shareholders	227,256		508,542	$	0.45	196,795		508,930	$	0.39
Effect of dilutive securities:
Time based equity awards	—		593	—		—		560	—
Diluted EPS:
Earnings available to common shareholders	$	227,256	509,135	$	0.45	$	196,795	509,490	$	0.39

	Six Months Ended June 30, 2017					Six Months Ended June 30, 2016
(Amounts in thousands, except per share data)	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Net income	$	466,533	—	—		$	438,107	—	—
Basic EPS:
Earnings available to common shareholders	466,533		508,411	$	0.92	438,107		508,789	$	0.86
Effect of dilutive securities:
Time based equity awards	—		544	—		—		522	—
Diluted EPS:
Earnings available to common shareholders	$	466,533	508,955	$	0.92	$	438,107	509,311	$	0.86

12. Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended June 30
	2017			2016			2017			2016
(Thousands of Dollars)	Pension Benefits						Postretirement Health Care Benefits
Service cost	$	23,547		$	22,945		$	465		$	431
Interest cost	36,702			40,028			5,984			6,526
Expected return on plan assets	(52,318		)	(52,575		)	(6,155		)	(6,248		)
Amortization of prior service credit	(442		)	(477		)	(2,672		)	(2,671		)
Amortization of net loss	26,671			24,385			1,672			1,009
Net periodic benefit cost (credit)	34,160			34,306			(706		)	(953		)
Costs not recognized due to the effects of regulation	(3,899		)	(4,159		)	—			—
Net benefit cost (credit) recognized for financial reporting	$	30,261		$	30,147		$	(706	)	$	(953	)

31

	Six Months Ended June 30
	2017			2016			2017			2016
(Thousands of Dollars)	Pension Benefits						Postretirement Health Care Benefits
Service cost	$	47,094		$	45,865		$	930		$	863
Interest cost	73,404			80,051			11,968			13,053
Expected return on plan assets	(104,635		)	(105,150		)	(12,311		)	(12,497		)
Amortization of prior service credit	(884		)	(961		)	(5,343		)	(5,343		)
Amortization of net loss	53,341			48,770			3,344			2,020
Net periodic benefit cost (credit)	68,320			68,575			(1,412		)	(1,904		)
Costs not recognized due to the effects of regulation	(7,914		)	(8,611		)	—			—
Net benefit cost (credit) recognized for financial reporting	$	60,406		$	59,964		$	(1,412	)	$	(1,904	)

In January 2017, contributions of $150.0 million were made across four of Xcel Energy’s pension plans. Xcel Energy does not expect additional pension contributions during 2017.

13. Other Comprehensive Income

Changes in accumulated other comprehensive (loss) income, net of tax, for the three and six months ended June 30, 2017 and 2016 were as follows:

	Three Months Ended June 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains and Losses onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at April 1	$	(50,326	)	$	110	$	(58,365	)	$	(108,581	)
Other comprehensive income before reclassifications	26			1		—			27
Losses reclassified from net accumulated other comprehensive loss	803			—		956			1,759
Net current period other comprehensive income	829			1		956			1,786
Accumulated other comprehensive (loss) income at June 30	$	(49,497	)	$	111	$	(57,409	)	$	(106,795	)

	Three Months Ended June 30, 2016
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains and Losses onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at April 1	$	(53,928	)	$	110	$	(54,790	)	$	(108,608	)
Other comprehensive income before reclassifications	12			—		—			12
Losses reclassified from net accumulated other comprehensive loss	936			—		865			1,801
Net current period other comprehensive income	948			—		865			1,813
Accumulated other comprehensive (loss) income at June 30	$	(52,980	)	$	110	$	(53,925	)	$	(106,795	)

	Six Months Ended June 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at Jan. 1	$	(51,151	)	$	110	$	(59,313	)	$	(110,354	)
Other comprehensive income before reclassifications	26			1		—			27
Losses reclassified from net accumulated other comprehensive loss	1,628			—		1,904			3,532
Net current period other comprehensive income	1,654			1		1,904			3,559
Accumulated other comprehensive (loss) income at June 30	$	(49,497	)	$	111	$	(57,409	)	$	(106,795	)

32

	Six Months Ended June 30, 2016
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at Jan. 1	$	(54,862	)	$	110	$	(55,001	)	$	(109,753	)
Other comprehensive income (loss) before reclassifications	8			—		(653		)	(645		)
Losses reclassified from net accumulated other comprehensive loss	1,874			—		1,729			3,603
Net current period other comprehensive income	1,882			—		1,076			2,958
Accumulated other comprehensive (loss) income at June 30	$	(52,980	)	$	110	$	(53,925	)	$	(106,795	)

Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2017 and 2016 were as follows:

(Thousands of Dollars)	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
	Three Months Ended June 30, 2017				Three Months Ended June 30, 2016
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	1,319		(a)	$	1,483		(a)
Vehicle fuel derivatives	(5		)	(b)	47			(b)
Total, pre-tax	1,314				1,530
Tax benefit	(511		)		(594		)
Total, net of tax	803				936
Defined benefit pension and postretirement losses:
Amortization of net loss	1,621			(c)	1,478			(c)
Prior service credit	(57		)	(c)	(64		)	(c)
Total, pre-tax	1,564				1,414
Tax benefit	(608		)		(549		)
Total, net of tax	956				865
Total amounts reclassified, net of tax	$	1,759			$	1,801

	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
(Thousands of Dollars)	Six Months Ended June 30, 2017				Six Months Ended June 30, 2016
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	2,678		(a)	$	2,968		(a)
Vehicle fuel derivatives	(5		)	(b)	104			(b)
Total, pre-tax	2,673				3,072
Tax benefit	(1,045		)		(1,198		)
Total, net of tax	1,628				1,874
Defined benefit pension and postretirement losses:
Amortization of net loss	3,244			(c)	2,956			(c)
Prior service credit	(117		)	(c)	(128		)	(c)
Total, pre-tax	3,127				2,828
Tax benefit	(1,223		)		(1,099		)
Total, net of tax	1,904				1,729
Total amounts reclassified, net of tax	$	3,532			$	3,603

^(a)  Included in interest charges.

^(b)  Included in O&M expenses.

^(c)  Included in the computation of net periodic pension and postretirement benefit costs. See Note 12 for details regarding these benefit plans.

33

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

The following discussion and analysis by management focuses on those factors that had a material effect on Xcel Energy’s financial condition, results of operations and cash flows during the periods presented, or are expected to have a material impact in the future. It should be read in conjunction with the accompanying unaudited consolidated financial statements and the related notes to consolidated financial statements. Due to the seasonality of Xcel Energy’s operating results, quarterly financial results are not an appropriate base from which to project annual results.

Forward-Looking Statements

Except for the historical statements contained in this report, the matters discussed herein, are forward-looking statements that are subject to certain risks, uncertainties and assumptions. Such forward-looking statements, including our 2017 earnings per share guidance and assumptions, are intended to be identified in this document by the words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “objective,” “outlook,” “plan,” “project,” “possible,” “potential,” “should” and similar expressions. Actual results may vary materially. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information. The following factors, in addition to those discussed elsewhere in this Quarterly Report on Form 10-Q and in other securities filings (including Xcel Energy’s Annual Report on Form 10-K for the fiscal year ended Dec. 31, 2016, and subsequent securities filings, could cause actual results to differ materially from management expectations as suggested by such forward-looking information: general economic conditions, including inflation rates, monetary fluctuations and their impact on capital expenditures and the ability of Xcel Energy Inc. and its subsidiaries (collectively, Xcel Energy) to obtain financing on favorable terms; business conditions in the energy industry; including the risk of a slow down in the U.S. economy or delay in growth, recovery, trade, fiscal, taxation and environmental policies in areas where Xcel Energy has a financial interest; customer business conditions; actions of credit rating agencies; competitive factors including the extent and timing of the entry of additional competition in the markets served by Xcel Energy and its subsidiaries; unusual weather; effects of geopolitical events, including war and acts of terrorism; cyber security threats and data security breaches; state, federal and foreign legislative and regulatory initiatives that affect cost and investment recovery, have an impact on rates or have an impact on asset operation or ownership or impose environmental compliance conditions; structures that affect the speed and degree to which competition enters the electric and natural gas markets; costs and other effects of legal and administrative proceedings, settlements, investigations and claims; financial or regulatory accounting policies imposed by regulatory bodies; outcomes of regulatory proceedings; availability or cost of capital; and employee work force factors.

Financial Review

The only common equity securities that are publicly traded are common shares of Xcel Energy Inc. The diluted earnings and EPS of each subsidiary discussed below do not represent a direct legal interest in the assets and liabilities allocated to such subsidiary but rather represent a direct interest in our assets and liabilities as a whole. Ongoing diluted EPS for Xcel Energy and by subsidiary is a financial measure not recognized under GAAP. Ongoing diluted EPS is calculated by dividing the net income or loss attributable to the controlling interest of each subsidiary, adjusted for certain items, by the weighted average fully diluted Xcel Energy Inc. common shares outstanding for the period. We use this non-GAAP financial measure to evaluate and provide details of Xcel Energy’s core earnings and underlying performance. We believe this measurement is useful to investors in facilitating period over period comparisons and evaluating or projecting financial results. This non-GAAP financial measure should not be considered as an alternative to measures calculated and reported in accordance with GAAP.

34

Results of Operations

The following table summarizes diluted EPS for Xcel Energy:

	Three Months Ended June 30						Six Months Ended June 30
Diluted Earnings (Loss) Per Share	2017			2016			2017			2016
PSCo	$	0.20		$	0.17		$	0.42		$	0.40
NSP-Minnesota	0.17			0.15			0.36			0.34
SPS	0.07			0.06			0.12			0.11
NSP-Wisconsin	0.03			0.02			0.07			0.06
Equity earnings of unconsolidated subsidiaries	0.01			0.01			0.02			0.03
Regulated utility (a)	0.48			0.42			0.99			0.93
Xcel Energy Inc. and other	(0.03		)	(0.04		)	(0.07		)	(0.07		)
GAAP diluted EPS (a)	$	0.45		$	0.39		$	0.92		$	0.86

^(a)  Amounts may not add due to rounding.

Earnings Adjusted for Certain Items (Ongoing Earnings)

Ongoing earnings reflect adjustments to GAAP earnings for certain items. Xcel Energy’s management believes that ongoing earnings provide a meaningful comparison of earnings results and is representative of Xcel Energy’s fundamental core earnings power. Xcel Energy’s management uses ongoing earnings internally for financial planning and analysis, for reporting of results to the Board of Directors, in determining whether performance targets are met for performance-based compensation, and when communicating its earnings outlook to analysts and investors.

Summary of Earnings

Xcel Energy— Xcel Energy’s earnings increased $0.06 per share for the second quarter of 2017 and year-to-date. Earnings for the second quarter of 2017 increased due to higher electric and natural gas margins to recover infrastructure investments, along with a lower effective tax rate and lower operating and maintenance (O&M) expenses, partially offset by higher depreciation.

PSCo — Earnings increased $0.03 per share for the second quarter of 2017 and $0.02 per share year-to-date. The year-to-date increase in earnings was driven by higher electric and natural gas margins and lower O&M expenses, partially offset by increased depreciation.

NSP-Minnesota — Earnings increased $0.02 per share for the second quarter of 2017 and year-to-date. The year-to-date increase in earnings was due to higher electric margins driven by the rate case in Minnesota, as well as increased natural gas margins, non-fuel riders and lower O&M expenses, partially offset by increased depreciation.

SPS — Earnings increased $0.01 per share for the second quarter of 2017 and year-to-date. The year-to-date increase in earnings was due to the positive impact of rate increases in Texas and New Mexico, which was partially offset by increased depreciation and timing of O&M expenses.

NSP-Wisconsin — Earnings increased $0.01 per share for the second quarter of 2017 and year-to-date. The year-to-date increase in earnings was driven by higher electric margins primarily due to rate increases, which were partially offset by additional depreciation.

35

Changes in Diluted EPS

The following table summarizes significant components contributing to the changes in 2017 EPS compared with the same period in 2016:

Diluted Earnings (Loss) Per Share	Three Months Ended June 30			Six Months Ended June 30
2016 GAAP diluted EPS	$	0.39		$	0.86
Components of change — 2017 vs. 2016
Higher electric margins	0.06			0.12
Lower ETR (a)	0.02			0.04
Higher natural gas margins	0.01			0.02
Lower O&M expenses	0.02			0.01
Higher depreciation and amortization	(0.05		)	(0.11		)
Higher conservation and DSM expenses (offset by higher revenues)	(0.01		)	(0.02		)
Other, net	0.01			—
2017 GAAP diluted EPS	$	0.45		$	0.92

^(a)   Lower ETR includes the impact of $4.8 million and $8.8 million of wind production tax credits (PTCs) for the three and six months ended June 30, 2017, respectively, which are largely flowed back to customers through electric margin.

Statement of Income Analysis

The following discussion summarizes the items that affected the individual revenue and expense items reported in the consolidated statements of income.

Estimated Impact of Temperature Changes on Regulated Earnings— Unusually hot summers or cold winters increase electric and natural gas sales, while mild weather reduces electric and natural gas sales. The estimated impact of weather on earnings is based on the number of customers, temperature variances and the amount of natural gas or electricity the average customer historically uses per degree of temperature. Accordingly, deviations in weather from normal levels can affect Xcel Energy’s financial performance.

Degree-day or Temperature-Humidity Index (THI) data is used to estimate amounts of energy required to maintain comfortable indoor temperature levels based on each day’s average temperature and humidity. Heating degree-days (HDD) is the measure of the variation in the weather based on the extent to which the average daily temperature falls below 65° Fahrenheit. Cooling degree-days (CDD) is the measure of the variation in the weather based on the extent to which the average daily temperature rises above 65° Fahrenheit. Each degree of temperature above 65° Fahrenheit is counted as one CDD, and each degree of temperature below 65° Fahrenheit is counted as one HDD. In Xcel Energy’s more humid service territories, a THI is used in place of CDD, which adds a humidity factor to CDD. HDD, CDD and THI are most likely to impact the usage of Xcel Energy’s residential and commercial customers. Industrial customers are less sensitive to weather.

Normal weather conditions are defined as either the 20-year or 30-year average of actual historical weather conditions. The historical period of time used in the calculation of normal weather differs by jurisdiction, based on regulatory practice. To calculate the impact of weather on demand, a demand factor is applied to the weather impact on sales as defined above to derive the amount of demand associated with the weather impact.

The percentage increase (decrease) in normal and actual HDD, CDD and THI is provided in the following table:

	Three Months Ended June 30						Six Months Ended June 30
	2017 vs. Normal		2016 vs. Normal		2017 vs. 2016		2017 vs. Normal		2016 vs. Normal		2017 vs. 2016
HDD	(9.8	)%	(3.7	)%	(7.2	)%	(8.5	)%	(11.5	)%	2.3	%
CDD	5.4		1.7		3.7		7.4		1.7		5.5
THI	(3.9	)	15.8		(16.1	)	(6.9	)	15.4		(21.4	)

36

Weather— The following table summarizes the estimated impact of temperature variations on EPS compared with sales under normal weather conditions:

	Three Months Ended June 30									Six Months Ended June 30
	2017 vs. Normal			2016 vs. Normal			2017 vs. 2016			2017 vs. Normal			2016 vs. Normal			2017 vs. 2016
Retail electric	$	0.005		$	0.013		$	(0.008	)	$	(0.021	)	$	(0.004	)	$	(0.017	)
Firm natural gas	(0.002		)	—			(0.002		)	(0.020		)	(0.013		)	(0.007		)
Total (excluding decoupling)	$	0.003		$	0.013		$	(0.010	)	$	(0.041	)	$	(0.017	)	$	(0.024	)
Decoupling - Minnesota	—			(0.007		)	0.007			0.009			(0.001		)	0.010
Total (adjusted for recovery from decoupling)	$	0.003		$	0.006		$	(0.003	)	$	(0.032	)	$	(0.018	)	$	(0.014	)

Sales Growth (Decline) — The following tables summarize Xcel Energy and its subsidiaries’ sales growth (decline) for actual and weather-normalized sales in 2017 compared to the same period in 2016:

	Three Months Ended June 30
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Actual
Electric residential (a)	(1.5	)%	(1.4	)%	6.4	%	0.7	%	(0.3	)%
Electric commercial and industrial	2.6		(0.9	)	2.5		3.4		1.3
Total retail electric sales	1.4		(1.1	)	3.1		2.7		0.9
Firm natural gas sales	(8.5	)	3.6		N/A		4.2		(4.7	)

	Three Months Ended June 30
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Weather-normalized
Electric residential (a)	(0.3	)%	0.8	%	0.8	%	2.3	%	0.5	%
Electric commercial and industrial	3.0		(0.4	)	2.3		3.7		1.5
Total retail electric sales	2.0		(0.1	)	1.9		3.4		1.3
Firm natural gas sales	(3.9	)	4.6		N/A		3.3		(1.2	)

	Six Months Ended June 30
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Actual
Electric residential (a)	(1.6	)%	(1.2	)%	(2.3	)%	(0.5	)%	(1.5	)%
Electric commercial and industrial	0.5		(1.0	)	1.6		1.5		0.3
Total retail electric sales	(0.1	)	(1.1	)	0.8		0.8		(0.2	)
Firm natural gas sales	(6.8	)	4.0		N/A		3.7		(2.9	)

	Six Months Ended June 30
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Weather-normalized
Electric residential (a)	(0.6	)%	0.1	%	(1.5	)%	0.9	%	(0.3	)%
Electric commercial and industrial	0.7		(0.5	)	1.4		1.6		0.5
Total retail electric sales	0.3		(0.4	)	0.7		1.3		0.2
Firm natural gas sales	(1.0	)	4.2		N/A		3.3		0.9

37

	Six Months Ended June 30 (Excluding Leap Day) (b)
	PSCo		NSP-Minnesota		SPS		NSP-Wisconsin		Xcel Energy
Weather-normalized - adjusted for     leap day
Electric residential (a)	—	%	0.7	%	(0.9	)%	1.5	%	0.3	%
Electric commercial and industrial	1.2		—		1.9		2.1		1.0
Total retail electric sales	0.9		0.2		1.2		1.9		0.8
Firm natural gas sales	(0.2	)	5.1		N/A		4.2		1.7

^(a)  Extreme weather variations and additional factors such as windchill and cloud cover may not be reflected in weather-normalized and actual growth estimates.

^(b)   The estimated impact of the 2016 leap day is excluded to present a more comparable year-over-year presentation. The estimated impact of the additional day of sales in 2016 was approximately 50-60 basis points for retail electric and 80-90 basis points for firm natural gas for the six months ended.

Weather-normalized Electric Sales Growth (Decline) — Year-To-Date Excluding Leap Day

• PSCo’s flat residential sales reflect an increased number of customers and lower use per customer. The commercial and industrial (C&I) growth was mainly due to an increase in C&I customers and higher use per customer for both small and large C&I customers. The growth was primarily led by large customers that support the mining, oil and gas industries.

• NSP-Minnesota’s residential sales growth reflects customer additions, partially offset by lower use per customer. Flat C&I sales resulted from lower sales to small customers, offset by customer growth. Increased sales to large customers in manufacturing and energy industries offset smaller declines in services and air transportation.

• SPS’ residential fell largely due to lower use per customer. C&I sales growth reflects higher use per customer driven by the oil and natural gas industry in the Permian Basin.

• NSP-Wisconsin’s residential sales increase was primarily attributable to higher use per customer and customer additions. The C&I growth was largely due to higher use per customer and an increase in small customers in the sand mining industry.

Weather-normalized Natural Gas Sales Growth (Decline) - Year-To-Date Excluding Leap Day

• Across most natural gas service territories, higher natural gas sales reflect an increase in the number of customers, partially offset by a decline in customer use.

Electric Revenues and Margin

Electric revenues and fuel and purchased power expenses are largely impacted by the fluctuation in the price of natural gas, coal and uranium used in the generation of electricity, but as a result of the design of fuel recovery mechanisms to recover current expenses, these price fluctuations have minimal impact on electric margin. The following table details the electric revenues and margin:

	Three Months Ended June 30						Six Months Ended June 30
(Millions of Dollars)	2017			2016			2017			2016
Electric revenues	$	2,338		$	2,224		$	4,637		$	4,409
Electric fuel and purchased power	(919		)	(856		)	(1,844		)	(1,718		)
Electric margin	$	1,419		$	1,368		$	2,793		$	2,691

38

The following tables summarize the components of the changes in electric revenues and electric margin:

Electric Revenues

(Millions of Dollars)	Three Months Ended June 30 2017 vs. 2016			Six Months Ended June 30 2017 vs. 2016
Retail rate increases (Texas, Minnesota, New Mexico and Wisconsin)	$	34		$	75
Fuel and purchased power cost recovery	41			56
Trading	14			42
Non-fuel riders	9			20
Higher conservation and DSM revenues (offset by higher expenses)	7			14
Wholesale transmission revenue	1			12
Retail sales growth, excluding weather impact	8			9
Decoupling (weather portion - Minnesota)	5			7
Estimated impact of weather	(6		)	(13		)
Other, net	1			6
Total increase in electric revenues	$	114		$	228

Electric Margin

(Millions of Dollars)	Three Months Ended June 30 2017 vs. 2016			Six Months Ended June 30 2017 vs. 2016
Retail rate increases (Texas, Minnesota, New Mexico and Wisconsin)	$	34		$	75
Non-fuel riders	9			20
Higher conservation and DSM revenues (offset by higher expenses)	7			14
Retail sales growth, excluding weather impact	8			9
Decoupling (weather portion - Minnesota)	5			7
Wholesale transmission revenue, net of costs	(6		)	(13		)
Estimated impact of weather	(6		)	(13		)
Other, net	—			3
Total increase in electric margin	$	51		$	102

Natural Gas Revenues and Margin

Total natural gas expense tends to vary with changing sales requirements and the cost of natural gas purchases. However, due to the design of purchased natural gas cost recovery mechanisms for sales to retail customers, fluctuations in the cost of natural gas has minimal impact on natural gas margin. The following table details natural gas revenues and margin:

	Three Months Ended June 30						Six Months Ended June 30
(Millions of Dollars)	2017			2016			2017			2016
Natural gas revenues	$	290		$	259		$	916		$	825
Cost of natural gas sold and transported	(114		)	(90		)	(479		)	(402		)
Natural gas margin	$	176		$	169		$	437		$	423

39

The following tables summarize the components of the changes in natural gas revenues and natural gas margin:

Natural Gas Revenues

(Millions of Dollars)	Three Months Ended June 30 2017 vs. 2016			Six Months Ended June 30 2017 vs. 2016
Purchased natural gas adjustment clause recovery	$	23		$	76
Infrastructure and integrity riders	5			12
Higher conservation and DSM revenues (offset by higher expenses)	1			4
Estimated impact of weather	(1		)	(5		)
Other, net	3			4
Total increase in natural gas revenues	$	31		$	91

Natural Gas Margin

(Millions of Dollars)	Three Months Ended June 30 2017 vs. 2016			Six Months Ended June 30 2017 vs. 2016
Infrastructure and integrity riders	$	5		$	12
Higher conservation and DSM revenues (offset by higher expenses)	1			4
Estimated impact of weather	(1		)	(5		)
Other, net	2			3
Total increase in natural gas margin	$	7		$	14

Non-Fuel Operating Expenses and Other Items

O&M Expenses — O&M expenses decreased $18.8 million, or 3.2 percent, for the second quarter of 2017 and decreased $9.8 million, or 0.8 percent, year-to-date. The year-to-date decrease is primarily due to the timing of planned maintenance and overhauls at a number of generation facilities, offset by increases in employee benefits expense and the impact of previously deferred 2016 expenses associated with the Texas 2016 electric rate case (approximately $8 million) recognized in 2017 in connection with the settlement, offset by revenue recovery.

Conservation and DSM Expenses — Conservation and demand side management (DSM) expenses increased $8.9 million, or 16.0 percent, for the second quarter of 2017 and increased $19.0 million, or 16.8 percent, year-to-date. Increases were due to higher recovery rates and additional customer participation in electric conservation programs, mostly in Minnesota. Conservation and DSM expenses are generally recovered in our major jurisdictions concurrently through riders and base rates. Timing of recovery may not correspond to the period in which costs were incurred.

Depreciation and Amortization — Depreciation and amortization increased $43.2 million, or 13.4 percent, for the second quarter of 2017 and increased $88.4 million, or 13.8 percent, year-to-date. The increase was primarily due to capital investments and prior year amortization of the excess depreciation reserve in Minnesota.

Allowance for Funds Used During Construction (AFUDC), Equity and Debt — AFUDC increased $2.6 million for the second quarter of 2017 and increased $4.8 million year-to-date. The increase was primarily due to higher average capital investments, particularly the Rush Creek wind project.

Interest Charges — Interest charges increased $1.2 million, or 0.7 percent, for the second quarter of 2017 and increased $10.7 million, or 3.4 percent, year-to-date. The increase was related to higher debt levels to fund capital investments, partially offset by refinancings at lower interest rates.

Income Taxes — Income tax expense decreased $2.0 million for the second quarter of 2017 compared with the same period in 2016. The decrease was primarily due an increase in wind PTCs in 2017, an increase in permanent plant-related adjustments (e.g., AFUDC-equity) in 2017 and a tax expense for a state tax credit valuation allowance in 2016, partially offset by higher pretax earnings in the second quarter of 2017. The ETR was 31.1 percent for the second quarter of 2017 compared with 34.7 percent for the same period in 2016. The lower ETR in 2017 was primarily due to the adjustments referenced above.

40

Income tax expense decreased $14.0 million for the first six months of 2017 compared with the same period in 2016. The decrease in income tax expense was primarily due to an increase in wind PTCs in 2017, an increase in permanent plant-related adjustments (e.g., AFUDC-equity) in 2017 and a tax expense for a state tax credit valuation allowance in 2016, partially offset by higher pretax earnings in the six months ended June 30, 2017. The ETR was 32.0 percent for the first six months of 2017, compared to 34.7 percent for the first six months of 2016. The lower ETR in 2017 was primarily due to the adjustments referenced above.

Public Utility Regulation

Except to the extent noted below, the circumstances set forth in Public Utility Regulation included in Item 1 of Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 and Public Utility Regulation included in Item 2 of Xcel Energy Inc.’s

Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017, appropriately represent, in all material respects, the current status of public utility regulation and are incorporated herein by reference.

Xcel Energy Inc.

Wind Development —During the first quarter of 2017, Xcel Energy announced plans to significantly expand its wind capacity by adding 1,550 MW of new wind generation at NSP-Minnesota and 1,230 MW at SPS. Previously, Xcel Energy received regulatory approval to build a 600 MW wind farm at PSCo.

In July 2017, the MPUC approved NSP-Minnesota’s proposal to add 1,550 MW of new wind generation, including ownership of 1,150 MW of wind generation by NSP-Minnesota. The MPUC approved an aggregate capital cap for the 750 MW of self-build projects, allowing NSP-Minnesota to include in rate base any savings versus a capital cost estimate for the projects. NSP-Minnesota would not recover capital costs in excess of the cap.

The PUCT and NMPRC are expected to rule on SPS’ wind projects by the end of the first quarter of 2018.

Key dates in the PUCT procedural schedule are as follows:

• Intervenor testimony — Oct. 2, 2017;

• Staff testimony — Oct. 9, 2017;

• Rebuttal testimony — Oct. 23, 2017; and

• Hearing — Nov. 6 - Nov. 17, 2017.

Key dates in the NMPRC procedural schedule are as follows:

• Staff and intervenor testimony — Oct. 24, 2017;

• Rebuttal testimony — Nov. 9, 2017; and

• Hearing — Nov. 28 - Dec. 1, 2017.

In total, Xcel Energy has proposed adding 3,380 MW of wind capacity by the end of 2020. Xcel Energy has filed to own and place in rate base 2,750 MW of these wind projects, while 630 MW would be through PPAs. These wind projects would qualify for 100 percent of the production tax credit and are intended to provide billions of dollars of savings to our customers and substantial environmental benefits. Projected savings/benefits assume fuel costs and generation mix consistent with those included in various commission approved resource plans and generation need filings.

41

The following table details these wind projects:

Project Name	Capacity (MW)	State	Estimated Year of Completion	Ownership/PPA	Regulatory Status
Rush Creek	600	CO	2018	PSCo	Approved by CPUC
Freeborn	200	MN/IA	2020	NSP-Minnesota	Approved by MPUC
Blazing Star 1	200	MN	2019	NSP-Minnesota	Approved by MPUC
Blazing Star 2	200	MN	2020	NSP-Minnesota	Approved by MPUC
Lake Benton	100	MN	2019	NSP-Minnesota	Approved by MPUC
Foxtail	150	ND	2019	NSP-Minnesota	Approved by MPUC
Crowned Ridge	300	SD	2019	NSP-Minnesota	Approved by MPUC
Hale	478	TX	2019	SPS	Pending PUCT & NMPRC Approval
Sagamore	522	NM	2020	SPS	Pending PUCT & NMPRC Approval
Total Ownership	2,750
Crowned Ridge	300	SD	2019	PPA	Approved by MPUC
Clean Energy 1	100	ND	2019	PPA	Approved by MPUC
Bonita	230	TX	2019	PPA	Pending PUCT & NMPRC Approval
Total PPA	630

Xcel Energy’s total capital investment for the proposed wind ownership projects is approximately $4.2 billion for 2017-2020.

NSP-Minnesota

PPA Terminations and Amendments — In June and July 2017, NSP-Minnesota filed requests with the MPUC and/or the NDPSC for several initiatives including changes to four PPAs to reduce future costs for customers. These actions include the following:

• The termination of a PPA with Benson Power LLC (Benson) for its 55 MW biomass facility in Benson, Minn. The termination of the Benson PPA requires FERC approval and would result in payments of $95 million to terminate the PPA and acquire the facility, as well as additional expenditures of approximately $26 million to temporarily operate then close the facility.

• The termination of a PPA with Laurentian Energy Authority I, LLC (Laurentian) for its 35 MW of biomass facilities in Hibbing and Virginia, Minn. The termination of the Laurentian PPA would result in $108.5 million of contract cancellation payments over six years.

• The remaining two requested PPA changes involve a PPA extension for a 34 MW waste-to-energy facility at a price reflective of current market conditions and termination of another 12 MW waste-to-energy PPA.

NSP-Minnesota has requested recovery of all costs associated with these changes through the Fuel Clause Adjustment, including a return on NSP-Minnesota’s total investment in the Benson transaction over the remaining life of the current PPA through 2028. If approved, these actions together are intended to provide approximately $653 million in net cost savings to customers over the next 10 years.

Nuclear Power Operations

NSP-Minnesota owns two nuclear generating plants: the Monticello plant and the PI plant. See Note 14 of Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 for further discussion regarding the nuclear generating plants. The circumstances set forth in Nuclear Power Operations and Waste Disposal included in Item 1 of Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 and Nuclear Power Operations included in Item 2 of Xcel Energy Inc.’s Quarterly

Report on Form 10-Q for the quarterly period ended March 31, 2017, appropriately represent, in all material respects, the current status of nuclear power operations, and are incorporated herein by reference.

42

NSP-Wisconsin

NSP-Wisconsin / American Transmission Company, LLC (ATC) - La Crosse to Madison, Wis. Transmission Line — In 2013, NSP-Wisconsin and ATC jointly filed an application with the PSCW for a certificate of public convenience and necessity (CPCN) for a new 345 kilovolt transmission line that would extend from La Crosse, Wis. to Madison, Wis.  NSP-Wisconsin’s half of the line will be shared with three co-owners, Dairyland Power Cooperative, WPPI Energy and Southern Minnesota Municipal Power Agency-Wisconsin.

In 2015, the PSCW issued its order approving a CPCN and route for the project. Two groups have appealed the CPCN order to the La Crosse County Circuit Court (Circuit Court). In May 2017, the Circuit Court determined that the project was necessary, allowing construction to continue on a seven mile segment near La Crosse, Wis. The parties have appealed various aspects of the case to the Wisconsin Court of Appeals, which is currently pending. The CPCN remains in full effect unless one of the parties seeks and receives a stay from the court and posts a bond to cover damages the utilities may incur due to delay. The 180-mile project is expected to cost approximately $541 million. NSP-Wisconsin’s portion of the investment, which includes AFUDC, is estimated to be approximately $200 million. Construction on the line began in January 2016, with completion anticipated by late 2018.

2016 Electric Fuel Cost Recovery — NSP-Wisconsin’s electric fuel costs for the year ended Dec. 31, 2016 were lower than authorized in rates and outside the two percent annual tolerance band established in the Wisconsin fuel cost recovery rules, primarily due to lower sales volume and lower purchased power costs coupled with moderate weather. Under the fuel cost recovery rules, NSP-Wisconsin may retain the amount of over-recovery up to two percent of authorized annual fuel costs, or approximately $3.4 million. However, NSP-Wisconsin must defer the amount of over-recovery in excess of the two percent annual tolerance band for future refund to customers. In July 2017, the PSCW required NSP-Wisconsin to provide a refund of $9.5 million to customers, which is expected to start in September 2017.

2017 Electric Fuel Cost Recovery — NSP-Wisconsin’s electric fuel costs for the six months ended June 30, 2017 were lower than authorized in rates and outside the two percent annual tolerance band established in the Wisconsin fuel cost recovery rules, primarily due to lower sales volume and lower purchased power costs coupled with moderate weather and generation sales into the MISO market.  Under the fuel cost recovery rules, NSP-Wisconsin may retain the amount of over-recovery up to two percent of authorized annual fuel costs, or approximately $3.7 million.  However, NSP-Wisconsin must defer the amount of over-recovery in excess of the two percent annual tolerance band for future refund to customers.  Accordingly, NSP-Wisconsin recorded a deferral of approximately $3.0 million through June 30, 2017.  The amount of the deferral could increase or decrease based on actual fuel costs incurred for the remainder of the year.  In the first quarter of 2018, NSP-Wisconsin will file a reconciliation of 2017 fuel costs with the PSCW.  The amount of any potential refund is subject to review and approval by the PSCW, which is not expected until mid-2018.

PSCo

Rush Creek Wind Ownership Proposal — In 2016, the CPUC granted PSCo a CPCN to build, own and operate a 600 MW wind generation facility in Colorado at Rush Creek. The CPCN includes a hard cost-cap of $1.096 billion (including transmission costs) and a capital cost sharing mechanism between customers and PSCo of 82.5 percent to customers and 17.5 percent to PSCo for every $10 million the project comes in below the cost-cap.

All major contracts required to complete the project have been executed including the Vestas turbine supply and balance of plant agreements. Vestas PTC components for safe harboring the facility have been fabricated and are currently being stored at Vestas facilities in Colorado. Construction of roads, collection systems, and foundations began in April 2017.

In June 2017, PSCo filed its report required under Colorado rules that require PSCo to consider Best Value Employment Metrics (BVEM) as a factor in selecting contractors for generation projects. On July 5, 2017, several building trades filed comments arguing that PSCo’s Balance of Plant Contractor selection was inappropriate as it did not follow a more detailed and quantitative analysis. The trade unions argued that the BVEM deficiencies could be remedied through execution of a Project Labor Agreement on the project. PSCo filed its reply indicating that it satisfied the BVEM rule requirements on July 18, 2017, which was discussed by the CPUC on July 20, 2017. The CPUC took no action other than to request reconsideration of whether bidder’s BVEM information can be provided as public information. PSCo is evaluating this request.

43

2016 Electric Resource Plan (ERP) — In May 2016, PSCo filed its 2016 ERP which included its estimated need for additional generation resources and its proposal to acquire those resources through a competitive Request for Proposal (RFP) process. The CPUC issued its decision on Phase I in late April 2017, approving the Phase I modeling assumptions to be used in Phase II and directed PSCo to file an updated capacity need prior to issuing any RFPs. PSCo plans to update the range of resource need to be considered within the competitive RFP process and issue the RFP in August 2017. The CPUC is expected to rule on the RFP results in the second quarter of 2018.

Advanced Grid Intelligence and Security — In July 2017, the CPUC approved PSCo’s CPCN for implementation of its advanced grid initiative. The project incorporates installing advanced meters, implementing hardware and software applications to allow the distribution system to operate at a lower voltage (integrated volt-var optimization) and installing communications infrastructure. These major projects are expected to improve customer experience, enhance grid reliability and enable the implementation of new and innovative programs and rate structures.

In June 2017, the CPUC approved a settlement, which delayed the advanced meter deployment from 2017-2021 to 2019-2024. The total capital cost of the project is currently estimated to be approximately $537 million for 2017-2024. As a result of the settlement, approximately $120 million of capital investment was deferred to 2022-2024.

Decoupling Filing — In July 2016, PSCo filed a request with the CPUC to approve a partial decoupling mechanism, which would adjust annual revenues based on changes in weather normalized average use per customer for the residential and small commercial classes. 

In July 2017, the CPUC issued a decision which approved the following key decisions regarding decoupling:

• Effective Jan. 1, 2018 through December 2023 (subject to establishing new rates in the next electric rate case);

• Applicable to the residential class and small commercial class;

• Based on total class revenues (subject to establishing the base period in the next electric rate case);

• Based on actual sales; and

• Subject to a soft cap of 3 percent on any annual adjustment.

PSCo plans to seek reconsideration of the order.

Boulder, Colo. Municipalization — In 2011, Boulder voters passed a ballot measure authorizing the formation of a municipal utility. In 2014, the Boulder City Council passed an ordinance to establish an electric utility. PSCo challenged the formation of this utility as premature because costs and system separation plans were not final. The Boulder District Court dismissed the case for lack of subject matter jurisdiction. PSCo appealed this decision. In September 2016, the Colorado Court of Appeals vacated the District Court’s decision, and ultimately preserved PSCo’s ability to challenge the utility formation. Boulder subsequently filed a Petition for Writ of Certiorari with the Colorado Supreme Court. The Supreme Court has not yet ruled whether it will exercise its discretion and review the petition.

In January 2015, the Boulder District Court affirmed a prior CPUC decision that Boulder cannot serve customers outside its city limits. The District Court also ruled the CPUC has jurisdiction over the transfer of any facilities to Boulder and how the systems are separated to preserve reliability, safety and effectiveness. In February 2015, the Boulder District Court also dismissed the condemnation action Boulder had filed. The CPUC must approve the separation plan before Boulder files its condemnation proceeding.

In July 2015, Boulder filed an application with the CPUC requesting approval of its proposed separation plan. PSCo filed a motion to dismiss Boulder’s application. The CPUC dismissed a portion of Boulder’s application, but allowed Boulder to supplement its application. Boulder filed its second supplemental application in September 2016. In March 2017, PSCo and other parties filed their testimony outlining their concerns about the Boulder separation plan and raised legal concerns about aspects of the plan.  In April 2017, despite extensive negotiations between PSCo and Boulder, the Boulder City Council voted to continue litigation for municipalization. Also, the CPUC ordered Boulder to file a third supplemental separation plan clearly laying out Boulder’s proposal. Boulder proposed a plan that would cost approximately $75 million. Boulder proposed sharing of certain distribution and substation facilities and requested that PSCo be required to construct Boulder’s new facilities and finance the construction. In June 2017, PSCo and other intervenors filed alternatives to Boulder’s separation plan and opposed the sharing; contracting and financing aspects of the plan. Evidentiary hearings began July 26, 2017.

44

Mountain West Transmission Group (MWTG) — PSCo initiated discussions with six other transmission owners from the Rocky Mountain region to evaluate the merits of creating and operating pursuant to a joint transmission tariff that may increase wholesale market efficiency and improve regional transmission planning. In 2016, the MWTG established a non-binding memorandum of understanding to guide their process and issued a request for information to four established RTOs. In January 2017, the MWTG initiated preliminary discussions with the SPP to begin evaluation of the costs and benefits of MWTG participation in the SPP RTO. The CPUC has held informational meetings on certain issues including financial implications and reliability. If PSCo were to move forward with RTO participation, CPUC and FERC approval would be required. If approved, operations within the RTO would not be expected to begin until 2019, at the earliest. PSCo will evaluate its options later in 2017 and beyond.

SPS

TUCO Substation to Yoakum County Substation to Hobbs Plant Substation 345 KV Transmission Line— In March 2016, the PUCT approved SPS’ Certificate of Convenience and Necessity (CCN) for the 33-mile Yoakum County to Texas/New Mexico State line portion of this 345 KV line project. A CCN for the 111-mile TUCO to Yoakum County substation segment was filed in June 2016. Assuming approval of this CCN, this segment is scheduled to be in service in 2020. A 36-mile CCN for the Texas/New Mexico state line to Hobbs Plant segment was filed in June 2017. The estimated project cost for all three segments is approximately $242 million.

Wholesale Customer Participation in Electric Reliability Council of Texas (ERCOT) — In March 2016, the PUCT Staff requested comments on Lubbock Power & Light’s (LP&L’s) proposal to transition a portion of its load (approximately 430 MW on a peak basis) to the ERCOT in June 2019. LP&L’s proposal would result in an approximate seven percent reduction of load in SPS, or a loss of approximately $18 million in wholesale transmission revenue.  The remaining portion of LP&L’s load (approximately 170 MW) would continue to be served by SPS. Should LP&L join ERCOT, costs to SPS’ remaining customers would increase as SPS’ transmission costs would be spread across a smaller base of customers. 

The PUCT has indicated there will be a two-step process regarding LP&L’s possible transfer to ERCOT. The first step will be a proceeding to determine whether the proposed transfer is in the public interest and to consider certain protections for non-LP&L customers who would be affected by LP&L’s transfer. If the PUCT determines the transfer is in the public interest, the second step will be for LP&L to file a CCN application for transmission facilities to connect with ERCOT. The PUCT asked SPP and ERCOT to perform reliability and economic studies to better understand the implications of LP&L’s proposal. SPP and ERCOT filed the studies on June 30, 2017. LP&L is expected to file an application with the PUCT for a public interest determination in August 2017. SPS intends to participate in the PUCT’s processes to protect its customers’ interests.

No final decision regarding LP&L’s departure or its potential timing is expected until completion of the PUCT proceedings.

Summary of Recent Federal Regulatory Developments

FERC

The FERC has jurisdiction over rates for electric transmission service in interstate commerce and electricity sold at wholesale, hydro facility licensing, natural gas transportation, asset transactions and mergers, accounting practices and certain other activities of Xcel Energy Inc.’s utility subsidiaries and transmission-only subsidiaries, including enforcement of North American Electric Reliability Corporation mandatory electric reliability standards. State and local agencies have jurisdiction over many of Xcel Energy Inc.’s utility subsidiaries’ activities, including regulation of retail rates and environmental matters. See additional discussion in the summary of recent federal regulatory developments and public utility regulation sections of the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016 and Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017. In addition to the matters discussed below, see Note 5 to the consolidated financial statements for a discussion of other regulatory matters.

Status of FERC Commissioners — The FERC is normally comprised of five commissioners appointed by the President and confirmed by the Senate. There is currently only one sitting commissioner.  Without three commissioners, the FERC does not have a quorum to act on contested matters. The lack of a quorum could affect the timing of FERC decisions on proposed rules or pending, newly submitted and future filings involving, among other things, contested electric rate matters and CPCNs for construction of interstate natural gas pipeline facilities to serve the utility subsidiaries.  Xcel Energy does not expect any disruption in operations or material delay in decisions on contested matters pending before the FERC. President Trump has submitted nominations to fill three of the vacant seats and has indicated his intent to submit one additional nomination. The three submitted nominations are pending confirmation by the full Senate.

45

FERC ROE Policy — In June 2014, the FERC adopted a two-step ROE methodology for electric utilities in an order issued in a complaint proceeding involving New England Transmission Owners (NETOs). The issue of how to apply the FERC ROE methodology has been contested in various complaint proceedings, including two ROE complaints involving the MISO TOs, which includes NSP-Minnesota and NSP-Wisconsin. In April 2017, the D.C. Circuit vacated and remanded the June 2014 ROE order. The D.C. Circuit found that the FERC had not properly determined that the ROE authorized for NETOs prior to June 2014 was unjust and unreasonable. The D.C. Circuit also found that the FERC failed to justify the new ROE methodology. The FERC has yet to act on the D.C. Circuit’s decision and cannot act without a quorum. See Note 5 to the consolidated financial statements for discussion of the D.C. Circuit’s decision and the impact on the MISO ROE Complaints.

Public Utility Regulatory Policies Act (PURPA) Enforcement Complaint against CPUC —In December 2016, Sustainable Power Group, LLC (sPower) petitioned the FERC to initiate an enforcement action in federal court against the CPUC under PURPA. The petition asserts that a December 2016 CPUC ruling, which indicated that a qualifying facility must be a successful bidder in a PSCo resource acquisition bidding process, violated PURPA and FERC rules. In January 2017, PSCo filed a motion to intervene and protest, arguing that the FERC should decline the petition. The CPUC filed a similar pleading. sPower has proposed to construct 800 MW of solar generation and 700 MW of wind generation in Colorado and seeks to require PSCo to contract for these resources under PURPA. If sPower were to prevail, PSCo’s ability to select generation resources through competitive bidding would be negatively affected. However, due to a lack of quorum at the FERC, the FERC did not act on that petition within the sixty days contemplated by PURPA. Subsequently sPower filed a complaint for declaratory and injunctive relief in the United States District Court for the District of Colorado (District Court) requesting that the court find the bidding requirement in the CPUC qualifying facility rules to be unlawful. PSCo has intervened in that proceeding and the CPUC has filed a motion to dismiss. In June 2017, the United States Magistrate Judge (Magistrate) issued a recommendation to the District Court that sPower’s complaint be dismissed because sPower failed to establish that it faced a substantial risk of harm. The Magistrate’s recommendation is pending before the District Court.

Solar Gardens Investment

In July 2017, a newly formed subsidiary of Xcel Energy signed an agreement with a solar developer to construct and operate approximately 19 MW of new community solar gardens in Minnesota serving existing NSP-Minnesota customers. The projects are expected to achieve commercial operations in 2017 and 2018.

Derivatives, Risk Management and Market Risk

Xcel Energy Inc. and its subsidiaries are exposed to a variety of market risks in the normal course of business. Market risk is the potential loss that may occur as a result of adverse changes in the market or fair value of a particular instrument or commodity. All financial and commodity-related instruments, including derivatives, are subject to market risk. See Note 8 to the consolidated financial statements for further discussion of market risks associated with derivatives.

Xcel Energy is exposed to the impact of adverse changes in price for energy and energy-related products, which is partially mitigated by the use of commodity derivatives. In addition to ongoing monitoring and maintaining credit policies intended to minimize overall credit risk, when necessary, management takes steps to mitigate changes in credit and concentration risks associated with its derivatives and other contracts, including parental guarantees and requests of collateral. While Xcel Energy expects that the counterparties will perform under the contracts underlying its derivatives, the contracts expose Xcel Energy to some credit and non-performance risk.

Though no material non-performance risk currently exists with the counterparties to Xcel Energy’s commodity derivative contracts, distress in the financial markets may in the future impact that risk to the extent it impacts those counterparties. Distress in the financial markets may also impact the fair value of the securities in the nuclear decommissioning fund and master pension trust, as well as Xcel Energy’s ability to earn a return on short-term investments of excess cash.

Commodity Price Risk — Xcel Energy Inc.’s utility subsidiaries are exposed to commodity price risk in their electric and natural gas operations. Commodity price risk is managed by entering into long- and short-term physical purchase and sales contracts for electric capacity, energy and energy-related products and for various fuels used in generation and distribution activities. Commodity price risk is also managed through the use of financial derivative instruments. Xcel Energy’s risk management policy allows it to manage commodity price risk within each rate-regulated operation to the extent such exposure exists.

46

Wholesale and Commodity Trading Risk — Xcel Energy Inc.’s utility subsidiaries conduct various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. Xcel Energy’s risk management policy allows management to conduct these activities within guidelines and limitations as approved by its risk management committee, which is made up of management personnel not directly involved in the activities governed by this policy.

At June 30, 2017, the fair values by source for net commodity trading contract assets were as follows:

	Futures / Forwards
(Thousands of Dollars)	Source of Fair Value	Maturity Less Than 1 Year		Maturity 1 to 3 Years			Maturity 4 to 5 Years		Maturity Greater Than 5 Years		Total Futures/ Forwards Fair Value
NSP-Minnesota	1	$	1,928	$	6,534		$	1,550	$	—	$	10,012
PSCo	1	396		(11		)	—		—		385
PSCo	2	1		—			—		—		1
		$	2,325	$	6,523		$	1,550	$	—	$	10,398

	Options
(Thousands of Dollars)	Source of Fair Value	Maturity Less Than 1 Year			Maturity 1 to 3 Years		Maturity 4 to 5 Years		Maturity Greater Than 5 Years		Total Futures/ Forwards Fair Value
NSP-Minnesota	2	$	(512	)	$	2,129	$	3,042	$	—	$	4,659

1 — Prices actively quoted or based on actively quoted prices.

2 — Prices based on models and other valuation methods.

Changes in the fair value of commodity trading contracts before the impacts of margin-sharing mechanisms were as follows:

	Six Months Ended June 30
(Thousands of Dollars)	2017			2016
Fair value of commodity trading net contract assets outstanding at Jan. 1	$	9,771		$	11,040
Contracts realized or settled during the period	(5,998		)	(1,406		)
Commodity trading contract additions and changes during the period	11,284			460
Fair value of commodity trading net contract assets outstanding at June 30	$	15,057		$	10,094

At June 30, 2017, a 10 percent increase in market prices for commodity trading contracts would increase pretax income from continuing operations by approximately $0.3 million, whereas a 10 percent decrease would decrease pretax income from continuing operations by approximately $0.8 million. At June 30, 2016, a 10 percent increase in market prices for commodity trading contracts would increase pretax income from continuing operations by approximately $0.1 million, whereas a 10 percent decrease would decrease pretax income from continuing operations by approximately $0.1 million.

Xcel Energy Inc.’s utility subsidiaries’ wholesale and commodity trading operations measure the outstanding risk exposure to price changes on transactions, contracts and obligations that have been entered into, but not closed, using an industry standard methodology known as Value at Risk (VaR). VaR expresses the potential change in fair value on the outstanding transactions, contracts and obligations over a particular period of time under normal market conditions.

The VaRs for the NSP-Minnesota and PSCo commodity trading operations, calculated on a consolidated basis using a Monte Carlo simulation with a 95 percent confidence level and a one-day holding period, were as follows:

(Millions of Dollars)	Three Months Ended June 30		VaR Limit		Average		High		Low
2017	$	0.26	$	3.00	$	0.38	$	0.66	$	0.04
2016	0.22		3.00		0.22		0.38		0.06

47

Nuclear Fuel Supply — NSP-Minnesota is scheduled to take delivery of approximately 13 percent of its 2017 and approximately 54 percent of its 2018 enriched nuclear material requirements from sources that could be impacted by events in Ukraine and sanctions against Russia. Alternate potential sources are expected to provide the flexibility to manage NSP-Minnesota’s nuclear fuel supply to ensure that plant availability and reliability will not be negatively impacted in the near-term. Long-term, through 2024, NSP-Minnesota is scheduled to take delivery of approximately 31 percent of its average enriched nuclear material requirements from sources that could be impacted by events in Ukraine and extended sanctions against Russia. NSP-Minnesota is closely following the progression of these events and will periodically assess if further actions are required to assure a secure supply of enriched nuclear material.

Separately, NSP-Minnesota has enriched nuclear fuel materials in process with Westinghouse Electric Corporation (Westinghouse). Westinghouse filed for Chapter 11 bankruptcy protection in March 2017. NSP-Minnesota owns materials in Westinghouse’s inventory and has contracts in place under which Westinghouse will provide certain services during an upcoming outage at PI. Westinghouse has indicated its intention to perform under the arrangements. Based on Westinghouse’s stated intent and the interim financing secured to fund its on-going operations, NSP-Minnesota does not expect the bankruptcy to materially impact NSP-Minnesota’s operational or financial performance.

Interest Rate Risk — Xcel Energy is subject to the risk of fluctuating interest rates in the normal course of business. Xcel Energy’s risk management policy allows interest rate risk to be managed through the use of fixed rate debt, floating rate debt and interest rate derivatives such as swaps, caps, collars and put or call options.

At June 30, 2017 and 2016, a 100-basis-point change in the benchmark rate on Xcel Energy’s variable rate debt would impact pretax interest expense annually by approximately $9.4 million and $5.9 million, respectively. See Note 8 to the consolidated financial statements for a discussion of Xcel Energy Inc. and its subsidiaries’ interest rate derivatives.

NSP-Minnesota also maintains a nuclear decommissioning fund, as required by the NRC. The nuclear decommissioning fund is subject to interest rate risk and equity price risk. At June 30, 2017, the fund was invested in a diversified portfolio of cash equivalents, debt securities, equity securities, and other investments. These investments may be used only for activities related to nuclear decommissioning. Given the purpose and legal restrictions on the use of nuclear decommissioning fund assets, realized and unrealized gains on fund investments over the life of the fund are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Consequently, any realized and unrealized gains and losses on securities in the nuclear decommissioning fund, including any other-than-temporary impairments, are deferred as a component of the regulatory asset for nuclear decommissioning. Since the accounting for nuclear decommissioning recognizes that costs are recovered through rates, fluctuations in equity prices or interest rates affecting the nuclear decommissioning fund do not have a direct impact on earnings.

Credit Risk — Xcel Energy Inc. and its subsidiaries are also exposed to credit risk. Credit risk relates to the risk of loss resulting from counterparties’ nonperformance on their contractual obligations. Xcel Energy Inc. and its subsidiaries maintain credit policies intended to minimize overall credit risk and actively monitor these policies to reflect changes and scope of operations.

At June 30, 2017, a 10 percent increase in commodity prices would have resulted in an increase in credit exposure of $18.1 million, while a decrease in prices of 10 percent would have resulted in an increase in credit exposure of $2.1 million. At June 30, 2016, a 10 percent increase in commodity prices would have resulted in a decrease in credit exposure of $9.2 million, while a decrease in prices of 10 percent would have resulted in an increase in credit exposure of $16.4 million.

Xcel Energy Inc. and its subsidiaries conduct standard credit reviews for all counterparties. Xcel Energy employs additional credit risk control mechanisms when appropriate, such as letters of credit, parental guarantees, standardized master netting agreements and termination provisions that allow for offsetting of positive and negative exposures. Credit exposure is monitored and, when necessary, the activity with a specific counterparty is limited until credit enhancement is provided. Distress in the financial markets could increase Xcel Energy’s credit risk.

Fair Value Measurements

Xcel Energy follows accounting and disclosure guidance on fair value measurements that contains a hierarchy for inputs used in measuring fair value and requires disclosure of the observability of the inputs used in these measurements. See Note 8 to the consolidated financial statements for further discussion of the fair value hierarchy and the amounts of assets and liabilities measured at fair value that have been assigned to Level 3.

48

Commodity Derivatives — Xcel Energy continuously monitors the creditworthiness of the counterparties to its commodity derivative contracts and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Given this assessment and the typically short duration of these contracts, the impact of discounting commodity derivative assets for counterparty credit risk was not material to the fair value of commodity derivative assets at June 30, 2017. Adjustments to fair value for credit risk of commodity trading instruments are recorded in electric revenues. Credit risk adjustments for other commodity derivative instruments are deferred as other comprehensive income (OCI) or regulatory assets and liabilities. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms. Xcel Energy also assesses the impact of its own credit risk when determining the fair value of commodity derivative liabilities. The impact of discounting commodity derivative liabilities for credit risk was immaterial to the fair value of commodity derivative liabilities at June 30, 2017.

Commodity derivative assets and liabilities assigned to Level 3 typically consist of FTRs, as well as forwards and options that are long-term in nature. Level 3 commodity derivative assets and liabilities represent 3.5 percent and 9.8 percent of total assets and liabilities, respectively, measured at fair value at June 30, 2017.

Determining the fair value of FTRs requires numerous management forecasts that vary in observability, including various forward commodity prices, retail and wholesale demand, generation and resulting transmission system congestion. Given the limited observability of management’s forecasts for several of these inputs, these instruments have been assigned a Level 3. Level 3 commodity derivatives assets and liabilities included $68.1 million and $4.0 million of estimated fair values, respectively, for FTRs held at June 30, 2017.

Determining the fair value of certain commodity forwards and options can require management to make use of subjective price and volatility forecasts which extend to periods beyond those readily observable on active exchanges or quoted by brokers. When less observable forward price and volatility forecasts are significant to determining the value of commodity forwards and options, these instruments are assigned to Level 3. There were $5.2 million in Level 3 commodity derivative assets and no liabilities for options held at June 30, 2017. There were immaterial Level 3 forwards held at June 30, 2017.

Liquidity and Capital Resources

Cash Flows

	Six Months Ended June 30
(Millions of Dollars)	2017		2016
Cash provided by operating activities	$	1,292	$	1,425

Net cash provided by operating activities decreased $133 million for the six months endedJune 30, 2017 compared with the six months endedJune 30, 2016. The decrease was primarily due to lower tax refunds received and the timing of vendor payments, customer receipts, refunds, and recovery of certain electric and natural gas riders, partially offset by higher net income, excluding amounts related to non-cash operating activities (e.g., depreciation and deferred tax expenses).

	Six Months Ended June 30
(Millions of Dollars)	2017			2016
Cash used in investing activities	$	(1,474	)	$	(1,443	)

Net cash used in investing activities increased $31 million for the six months endedJune 30, 2017 compared with the six months endedJune 30, 2016. The increase was primarily attributable to higher capital expenditures related to the Rush Creek wind generation facility, partially offset by lower rabbi trust investments in 2017.

	Six Months Ended June 30
(Millions of Dollars)	2017		2016
Cash provided by financing activities	$	159	$	10

Net cash provided by financing activities increased $149 million for the six months endedJune 30, 2017 compared with the six months endedJune 30, 2017. The increase was primarily attributable to lower repayments of long-term debt, partially offset by lower debt proceeds (net) year over year and higher dividend payments.

49

Capital Requirements

Xcel Energy expects to meet future financing requirements by periodically issuing short-term debt, long-term debt, common stock, hybrid and other securities to maintain desired capitalization ratios.

Regulation of Derivatives — In July 2010, financial reform legislation was passed that provides for the regulation of derivative transactions amongst other provisions. Provisions within the bill provide the Commodity Futures Trading Commission (CFTC) and the SEC with expanded regulatory authority over derivative and swap transactions. The CFTC ruled that swap dealing activity conducted by entities for the preceding 12 months under a notional limit, initially set at $8 billion, will fall under the general de minimis threshold and will not subject an entity to registering as a swap dealer. The de minimis threshold is scheduled to be reduced to $3 billion in 2018. Xcel Energy’s current and projected swap activity is well below these de minimis thresholds. The bill also contains provisions that exempt certain derivatives end users from much of the clearing and margin requirements and Xcel Energy’s Board of Directors has renewed the end-user exemption on an annual basis. Xcel Energy is currently meeting all reporting requirements and transaction restrictions.

Southwest Power Pool Inc. (SPP) FTR Margining Requirements — In SPP, the process for TOs involves the receipt of Auction Revenue Rights (ARRs) and, if elected by the TO, conversion of those ARRs to firm FTRs.  SPP requires that the TO post collateral for the conversion of ARRs to FTRs. At June 30, 2017, SPS had a $2.5 million letter of credit posted with SPP for the annual FTR auction, which was a reduction from the initial requirement of $15 million.

Pension Fund— Xcel Energy’s pension assets are invested in a diversified portfolio of domestic and international equity securities, short-term to long-duration fixed income securities, and alternative investments, including private equity, real estate, hedge fund of funds and commodity investments.

• In January 2017, contributions of $150.0 million were made across four of Xcel Energy’s pension plans;

• In 2016, contributions of $125.2 million were made across four of Xcel Energy’s pension plans; and

• For future years, contributions will be made as deemed appropriate based on evaluation of various factors including the funded status of the plans, minimum funding requirements, interest rates and expected investment returns.

Capital Sources

Short-Term Funding Sources — Xcel Energy uses a number of sources to fulfill short-term funding needs, including operating cash flow, notes payable, commercial paper and bank lines of credit. The amount and timing of short-term funding needs depend in large part on financing needs for construction expenditures, working capital and dividend payments.

Short-Term Investments — Xcel Energy Inc., NSP-Minnesota, NSP-Wisconsin, PSCo and SPS maintain cash operating and short-term investment accounts. At June 30, 2017, approximately $1.8 million of cash was held in these accounts.

Credit Facilities — NSP-Minnesota, NSP-Wisconsin, PSCo, SPS and Xcel Energy Inc. each have five-year credit agreements with a syndicate of banks. The total size of the credit facilities is $2.75 billion and each credit facility terminates in June 2021.

NSP-Minnesota, PSCo, SPS and Xcel Energy Inc. each have the right to request an extension of the revolving credit facility termination date for two additional one-year periods. NSP-Wisconsin has the right to request an extension of the revolving credit facility termination date for an additional one-year period. All extension requests are subject to majority bank group approval.

As of July 24, 2017, Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available to meet liquidity needs:

(Millions of Dollars)	Credit Facility (a)		Drawn(b)		Available		Cash		Liquidity
Xcel Energy Inc.	$	1,000	$	483	$	517	$	5	$	522
PSCo	700		3		697		1		698
NSP-Minnesota	500		145		355		1		356
SPS	400		101		299		—		299
NSP-Wisconsin	150		70		80		—		80
Total	$	2,750	$	802	$	1,948	$	7	$	1,955

^(a)  These credit facilities expire in June 2021.

^(b)  Includes outstanding commercial paper and letters of credit.

50

Commercial Paper — Xcel Energy Inc., NSP-Minnesota, NSP-Wisconsin, PSCo and SPS each have individual commercial paper programs. The authorized levels for these commercial paper programs are:

• $1 billion for Xcel Energy Inc.;

• $700 million for PSCo;

• $500 million for NSP-Minnesota;

• $400 million for SPS; and

• $150 million for NSP-Wisconsin.

Commercial paper outstanding for Xcel Energy was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended June 30, 2017			Year Ended Dec. 31, 2016
Borrowing limit	$	2,750		$	2,750
Amount outstanding at period end	784			392
Average amount outstanding	778			485
Maximum amount outstanding	1,247			1,183
Weighted average interest rate, computed on a daily basis	1.28		%	0.74		%
Weighted average interest rate at period end	1.49			0.95

Money Pool — Xcel Energy received FERC approval to establish a utility money pool arrangement with the utility subsidiaries, subject to receipt of required state regulatory approvals. The utility money pool allows for short-term investments in and borrowings between the utility subsidiaries. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc. The money pool balances are eliminated in consolidation.

NSP-Minnesota, PSCo and SPS participate in the money pool pursuant to approval from their respective state regulatory commissions. NSP-Wisconsin does not participate in the money pool.

Financing — Xcel Energy issues debt and equity securities to refinance retiring maturities, reduce short-term debt, fund capital programs, infuse equity in subsidiaries, fund asset acquisitions and for other general corporate purposes.

During 2017, Xcel Energy Inc. and its utility subsidiaries issued and anticipate issuing the following:

• PSCo issued $400 million of 3.80 percent first mortgage bonds due June 15, 2047;

• Xcel Energy Inc. plans to issue approximately $300 million of senior unsecured bonds in the fourth quarter;

• NSP-Minnesota plans to issue approximately $600 million of first mortgage bonds in the third quarter;

• NSP-Wisconsin plans to issue approximately $100 million of first mortgage bonds in the fourth quarter; and

• SPS plans to issue approximately $450 million of first mortgage bonds in the third quarter.

Financing plans are subject to change, depending on capital expenditures, internal cash generation, market conditions and other factors.

Off-Balance-Sheet Arrangements

Xcel Energy does not have any off-balance-sheet arrangements, other than those currently disclosed, that have or are reasonably likely to have a current or future effect on financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is material to investors.

Earnings Guidance and Long-Term EPS and Dividend Growth Rate Objectives

Xcel Energy’s 2017 GAAP and ongoing earnings guidance is $2.25 to $2.35 per share.^(a) Key assumptions related to 2017 earnings are detailed below:

• Constructive outcomes in all rate case and regulatory proceedings.

• Normal weather patterns are experienced for the remainder of the year.

• Weather-normalized retail electric utility sales are projected to increase 0 percent to 0.5 percent.

• Weather-normalized retail firm natural gas sales are projected to increase 0 percent to 0.5 percent.

51

• Capital rider revenue is projected to increase by $50 million to $60 million over 2016 levels. The change is largely due to the level of PTC, which flows back to customers.

• O&M expenses are projected to be flat.

• Depreciation expense is projected to increase approximately $180 million to $190 million over 2016 levels. The change in depreciation expense is largely due to changes in the amortization of the renewable development fund, which is offset in revenue and will not have an impact on earnings.

• Property taxes are projected to increase approximately $0 million to $10 million over 2016 levels.

• Interest expense (net of AFUDC — debt) is projected to increase $15 million to $25 million over 2016 levels.

• AFUDC — equity is projected to increase approximately $5 million to $15 million from 2016 levels.

• The ETR is projected to be approximately 31 percent to 33 percent. The change is largely due to the level of PTC, which flows back to customers.

• Average common stock and equivalents are projected to be approximately 509 million shares.

^(a)   Ongoing earnings could differ from those prepared in accordance with GAAP for unplanned and/or unknown adjustments. Xcel Energy is unable to forecast if any of these items will occur or provide a quantitative reconciliation of the guidance for ongoing diluted EPS to corresponding GAAP diluted EPS.

Long-Term EPS and Dividend Growth Rate Objectives

Xcel Energy expects to deliver an attractive total return to our shareholders through a combination of earnings growth and dividend yield, based on the following long-term objectives:

• Deliver long-term annual EPS growth of 4 percent to 6 percent;

• Deliver annual dividend increases of 5 percent to 7 percent;

• Target a dividend payout ratio of 60 percent to 70 percent; and

• Maintain senior unsecured debt credit ratings in the BBB+ to A range.

Ongoing earnings is calculated using net income and adjusting for certain nonrecurring or infrequent items that are, in management’s view, not reflective of ongoing operations.

Item 3 — QUANTITATIVE ANDQUALITATIVE DISCLOSURES ABOUT MARKET RISK

See Management’s Discussion and Analysis — Derivatives, Risk Management and Market Risk under Item 2.

Item 4 — CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Xcel Energy maintains a set of disclosure controls and procedures designed to ensure that information required to be disclosed in reports that it files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms. In addition, the disclosure controls and procedures ensure that information required to be disclosed is accumulated and communicated to management, including the chief executive officer (CEO) and chief financial officer (CFO), allowing timely decisions regarding required disclosure. As of June 30, 2017, based on an evaluation carried out under the supervision and with the participation of Xcel Energy’s management, including the CEO and CFO, of the effectiveness of its disclosure controls and the procedures, the CEO and CFO have concluded that Xcel Energy’s disclosure controls and procedures were effective.

Internal Control Over Financial Reporting

In 2016, Xcel Energy implemented the general ledger modules, as well as initiated deployment of work management systems modules, of a new enterprise resource planning system to improve certain financial and related transaction processes. Xcel Energy is continuing to implement additional modules including the conversion of existing work management systems to this same system during 2017. In connection with this ongoing implementation, Xcel Energy is updating its internal control over financial reporting, as necessary, to accommodate modifications to its business processes and accounting systems. Xcel Energy does not believe that this implementation will have an adverse effect on its internal control over financial reporting.

No changes in Xcel Energy’s internal control over financial reporting occurred during the most recent fiscal quarter that materially affected, or are reasonably likely to materially affect, Xcel Energy’s internal control over financial reporting.

52

Part II — OTHER INFORMATION

Item 1 — LEGAL PROCEEDINGS

Xcel Energy is involved in various litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss.

Additional Information

See Note 6 to the consolidated financial statements for further discussion of legal claims and environmental proceedings. See Part I Item 2 and Note 5 to the consolidated financial statements for a discussion of proceedings involving utility rates and other regulatory matters.

Item 1A — RISK FACTORS

Xcel Energy Inc.’s risk factors are documented in Item 1A of Part I of its Annual Report on Form 10-K for the year ended Dec. 31, 2016, which is incorporated herein by reference. There have been no material changes from the risk factors previously disclosed in the Form 10-K.

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

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

The following table provides information about our purchases of equity securities that are registered by Xcel Energy Inc. pursuant to Section 12 of the Exchange Act for the quarter ended June 30, 2017:

	Issuer Purchases of Equity Securities
Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number (or Approximate Dollar Value) of Shares That May Yet Be Purchased Under the Plans or Programs
April 1, 2017 — April 30, 2017	—	$	—	—	—
May 1, 2017 — May 31, 2017	—	—		—	—
June 1, 2017 — June 30, 2017	—	—		—	—
Total	—			—	—

53

Item 6 — EXHIBITS

* Indicates incorporation by reference

+ Executive Compensation Arrangements and Benefit Plans Covering Executive Officers and Directors

3.01*	Amended and Restated Articles of Incorporation of Xcel Energy Inc., as filed on May 18, 2012 (Exhibit 3.01 to Form 8-K dated May 16, 2012 (file no. 001-03034)).
3.02*	Bylaws of Xcel Energy Inc., as amended on Feb. 17, 2016 (Exhibit 3.01 to Form 8-K dated Feb. 18, 2016 (file no. 001-03034)).
4.01*	Supplemental Indenture No. 27 dated as of June 1, 2017 between PSCo and U.S. Bank National Association, as Trustee, creating $400 million principal amount of 3.80 percent First Mortgage Bonds, Series No. 30 due 2047. (Exhibit 4.01 to Form 8-K of PSCo dated June 19, 2017 (file no. 001-03280)).
31.01	Principal Executive Officer’s certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.02	Principal Financial Officer’s certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.01	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
99.01	Statement pursuant to Private Securities Litigation Reform Act of 1995.
101	The following materials from Xcel Energy Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2017 are formatted in XBRL (eXtensible Business Reporting Language):  (i) the Consolidated Statements of Income, (ii) the Consolidated Statements of Comprehensive Income (iii) the Consolidated Statements of Cash Flows, (iv) the Consolidated Balance Sheets, (v) the Consolidated Statements of Common Stockholders’ Equity, (vi) Notes to Consolidated Financial Statements, and (vii) document and entity information.

54

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.

		XCEL ENERGY INC.
July 28, 2017	By:	/s/ JEFFREY S. SAVAGE
		Jeffrey S. Savage
		Senior Vice President, Controller
		(Principal Accounting Officer)
		/s/ ROBERT C. FRENZEL
		Robert C. Frenzel
		Executive Vice President, Chief Financial Officer
		(Principal Financial Officer)

55

EX-31.01

Exhibit 31.01

CERTIFICATION

I, Ben Fowke, certify that:

1. I have reviewed this report on Form 10-Q of Xcel Energy Inc. (a Minnesota corporation);

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 officer 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 officer 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.

Date: July 28, 2017

/s/ BEN FOWKE

Ben Fowke

Chairman, President, Chief Executive Officer and Director

(Principal Executive Officer)

1

EX-31.02

Exhibit 31.02

CERTIFICATION

I, Robert C. Frenzel, certify that:

1. I have reviewed this report on Form 10-Q of Xcel Energy Inc. (a Minnesota corporation);

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 officer 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 officer 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.

Date: July 28, 2017

/s/ ROBERT C. FRENZEL

Robert C. Frenzel

Executive Vice President, Chief Financial Officer

(Principal Financial Officer)

2

EX-32.01

Exhibit 32.01

OFFICER CERTIFICATION

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 Xcel Energy Inc. (Xcel Energy) on Form 10-Q for the quarter ended June 30, 2017, as filed with the SEC on the date hereof (Form 10-Q), each of the undersigned officers of Xcel Energy 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 Xcel Energy as of the dates and for the periods expressed in the Form 10-Q.

Date: July 28, 2017

/s/ BEN FOWKE

Ben Fowke

Chairman, President, Chief Executive Officer and Director

(Principal Executive Officer)

/s/ ROBERT C. FRENZEL

Robert C. Frenzel

Executive Vice President, Chief Financial Officer

(Principal Financial Officer)

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report 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 Xcel Energy and will be retained by Xcel Energy and furnished to the SEC or its staff upon request.

1

EX-99.01

Exhibit 99.01

XCEL ENERGY CAUTIONARY FACTORS

The Private Securities Litigation Reform Act provides a “safe harbor” for forward-looking statements to encourage disclosures without the threat of litigation, providing those statements are identified as forward-looking and are accompanied by meaningful, cautionary statements identifying important factors that could cause the actual results to differ materially from those projected in the statement.  Forward-looking statements are made in written documents and oral presentations of Xcel Energy Inc. or any of its subsidiaries.  These statements are based on management’s beliefs as well as assumptions and information currently available to management.  Such forward-looking statements are intended to be identified in this document by the words “anticipate,” “believe,” “estimate,” “expect,” “intend,” “may,” “objective,” “outlook,” “plan,” “project,” “possible,” “potential,” “should” and similar expressions.  In addition to any assumptions and other factors referred to specifically in connection with such forward-looking statements, factors that could cause Xcel Energy’s actual results to differ materially from those contemplated in any forward-looking statements include, among others, the following:

• Economic conditions, including inflation rates, monetary fluctuations and their impact on capital expenditures;

• The risk of a significant slowdown in growth or decline in the U.S. economy, the risk of delay in growth recovery in the U.S. economy or the risk of increased cost for insurance premiums, security and other items as a consequence of past or future terrorist attacks;

• Trade, monetary, fiscal, taxation and environmental policies of governments, agencies and similar organizations in geographic areas where Xcel Energy has a financial interest;

• Customer business conditions, including demand for their products or services and supply of labor and materials used in creating their products and services;

• Financial or regulatory accounting principles or policies imposed by the FASB, the SEC, the FERC and similar entities with regulatory oversight;

• Availability of cost or capital such as changes in: interest rates; market perceptions of the utility industry, Xcel Energy Inc. or any of its subsidiaries; or security ratings;

• Factors affecting utility and nonutility operations such as unusual weather conditions; catastrophic weather-related damage; unscheduled generation outages, maintenance or repairs; unanticipated changes to fossil fuel, nuclear fuel or natural gas supply costs or availability due to higher demand, shortages, transportation problems or other developments; nuclear or environmental incidents; cyber incidents; or electric transmission or natural gas pipeline constraints;

• Employee workforce factors, including loss or retirement of key executives, collective-bargaining agreements with union employees, or work stoppages;

• Increased competition in the utility industry or additional competition in the markets served by Xcel Energy Inc. and its subsidiaries;

• State, federal and foreign legislative and regulatory initiatives that affect cost and investment recovery, have an impact on rate structures and affect the speed and degree to which competition enters the electric and natural gas markets; industry restructuring initiatives; transmission system operation and/or administration initiatives; recovery of investments made under traditional regulation; nature of competitors entering the industry; retail wheeling; a new pricing structure; and former customers entering the generation market;

• Environmental laws and regulations, including legislation and regulations relating to climate change, and the associated cost of  compliance;

• Rate-setting policies or procedures of regulatory entities, including environmental externalities, which are values established by regulators assigning environmental costs to each method of electricity generation when evaluating generation resource options;

• Nuclear regulatory policies and procedures, including operating regulations and spent nuclear fuel storage;

• Social attitudes regarding the utility and power industries;

• Cost and other effects of legal and administrative proceedings, settlements, investigations and claims;

• Technological developments that result in competitive disadvantages and create the potential for impairment of existing assets;

• Risks associated with implementations of new technologies; and

• Other business or investment considerations that may be disclosed from time to time in Xcel Energy Inc.’s SEC filings, including “Risk Factors” in Item 1A of Xcel Energy’s Form 10-K for the year ended Dec. 31, 2016, or in other publicly disseminated written documents.

Xcel Energy 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 should not be construed as exhaustive.

1

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 24, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	XCEL ENERGY INC
Entity Central Index Key	0000072903
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		507,762,881
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017

XML

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating revenues
Electric	$ 2,338,017	$ 2,224,142	$ 4,637,077	$ 4,409,261
Natural gas	289,839	258,899	915,542	824,588
Other	17,072	16,808	38,731	38,273
Total operating revenues	2,644,928	2,499,849	5,591,350	5,272,122
Operating expenses
Electric fuel and purchased power	919,099	855,968	1,844,320	1,717,820
Cost of natural gas sold and transported	114,320	90,071	479,454	402,188
Cost of sales — other	8,178	8,332	16,765	16,577
Operating and maintenance expenses	578,133	596,978	1,164,563	1,174,388
Conservation and demand side management expenses	64,860	55,916	132,393	113,352
Depreciation and amortization	365,720	322,534	730,924	642,554
Taxes (other than income taxes)	134,926	138,469	277,020	283,792
Total operating expenses	2,185,236	2,068,268	4,645,439	4,350,671
Operating income	459,692	431,581	945,911	921,451
Other income, net	2,608	1,560	9,054	5,810
Equity earnings of unconsolidated subsidiaries	7,541	9,617	15,416	22,799
Allowance for funds used during construction — equity	16,386	14,730	30,699	27,843
Interest charges and financing costs
Interest charges — includes other financing costs of $5,876, $6,630, $11,734 and $12,966, respectively	164,195	162,980	330,129	319,423
Allowance for funds used during construction — debt	(7,613)	(6,684)	(14,635)	(12,674)
Total interest charges and financing costs	156,582	156,296	315,494	306,749
Income before income taxes	329,645	301,192	685,586	671,154
Income taxes	102,389	104,397	219,053	233,047
Net income	$ 227,256	$ 196,795	$ 466,533	$ 438,107
Weighted average common shares outstanding:
Basic (in shares)	508,542	508,930	508,411	508,789
Diluted (in shares)	509,135	509,490	508,955	509,311
Earnings per average common share:
Basic (in dollars per share)	$ 0.45	$ 0.39	$ 0.92	$ 0.86
Diluted (in dollars per share)	0.45	0.39	0.92	0.86
Cash dividends declared per common share (in dollars per share)	$ 0.36	$ 0.34	$ 0.72	$ 0.68

XML

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest charges and financing costs
Other financing costs	$ 5,876	$ 6,630	$ 11,734	$ 12,966

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Comprehensive income:
Net income	$ 227,256	$ 196,795	$ 466,533	$ 438,107
Pension and retiree medical benefits:
Amortization of losses included in net periodic benefit cost, net of tax of $608, $550, $1,223 and $407, respectively	956	865	1,904	1,076
Derivative instruments:
Net fair value increase, net of tax of $17, $7, $17 and $5, respectively	26	12	26	8
Reclassification of losses to net income, net of tax of $511, $594, $1,045 and $1,198, respectively	803	936	1,628	1,874
Total derivative instruments, net of tax	829	948	1,654	1,882
Marketable securities:
Net fair value increase, net of tax of $0, $0, $0 and $0, respectively	1	0	1	0
Other comprehensive income	1,786	1,813	3,559	2,958
Comprehensive income	$ 229,042	$ 198,608	$ 470,092	$ 441,065

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Pension and retiree medical benefits:
Amortization of losses included in net periodic benefit cost, tax	$ 608	$ 550	$ 1,223	$ 407
Derivative instruments:
Net fair value increase (decrease), tax	17	7	17	5
Reclassification of losses to net income, tax	511	594	1,045	1,198
Marketable securities:
Net fair value increase (decrease), tax	$ 0	$ 0	$ 0	$ 0

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 466,533	$ 438,107
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	738,280	650,336
Conservation and demand side management program amortization	1,509	2,323
Nuclear fuel amortization	57,003	58,267
Deferred income taxes	309,239	252,889
Amortization of investment tax credits	(2,557)	(2,613)
Allowance for equity funds used during construction	(30,699)	(27,843)
Equity earnings of unconsolidated subsidiaries	(15,416)	(22,799)
Dividends from unconsolidated subsidiaries	23,507	22,910
Share-based compensation expense	31,892	24,454
Net realized and unrealized hedging and derivative transactions	217	3,903
Other, net	(2,441)	(388)
Changes in operating assets and liabilities:
Accounts receivable	16,906	35,042
Accrued unbilled revenues	121,333	65,159
Inventories	65,433	81,880
Other current assets	(84,024)	69,493
Accounts payable	(52,349)	27,805
Net regulatory assets and liabilities	1,498	34,264
Other current liabilities	(190,184)	(151,589)
Pension and other employee benefit obligations	(140,479)	(108,562)
Change in other noncurrent assets	(6,676)	(6,363)
Change in other noncurrent liabilities	(16,706)	(21,649)
Net cash provided by operating activities	1,291,819	1,425,026
Investing activities
Utility capital/construction expenditures	(1,473,793)	(1,413,129)
Proceeds from insurance settlement, investing activities	0	1,595
Allowance for equity funds used during construction	30,699	27,843
Purchases of investment securities	(368,266)	(319,880)
Proceeds from the sale of investment securities	350,448	262,321
Investments in WYCO Development LLC and other	(7,683)	(2,170)
Other, net	(5,483)	100
Net cash used in investing activities	(1,474,078)	(1,443,320)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	392,000	(399,000)
Proceeds from issuance of long-term debt	394,046	1,337,430
Repayments of long-term debt	(250,397)	(579,976)
Purchase of common stock for settlement of equity awards	(2,943)	(789)
Dividends paid	(355,250)	(335,113)
Other	(18,291)	(12,487)
Net cash provided by financing activities	159,165	10,065
Net change in cash and cash equivalents	(23,094)	(8,229)
Cash and cash equivalents at beginning of period	84,476	84,940
Cash and cash equivalents at end of period	61,382	76,711
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(301,350)	(293,954)
Cash (paid) received for income taxes, net	(3,853)	61,345
Supplemental disclosure of non-cash investing and financing transactions:
Property, plant and equipment additions in accounts payable	233,250	252,370
Issuance of common stock for equity awards	$ 18,505	$ 13,497

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 61,382	$ 84,476
Accounts receivable, net	759,378	776,289
Accrued unbilled revenues	608,499	729,832
Inventories	542,044	604,226
Regulatory assets	375,020	363,655
Derivative instruments	78,487	38,224
Prepaid taxes	196,247	106,697
Prepayments and other	135,493	138,682
Total current assets	2,756,550	2,842,081
Property, plant and equipment, net	33,543,843	32,841,750
Other assets
Nuclear decommissioning fund and other investments	2,231,588	2,091,858
Regulatory assets	3,023,128	3,080,867
Derivative instruments	50,410	50,189
Other	255,470	248,532
Total other assets	5,560,596	5,471,446
Total assets	41,860,989	41,155,277
Current liabilities
Current portion of long-term debt	505,345	255,529
Short-term debt	784,000	392,000
Accounts payable	973,642	1,044,959
Regulatory liabilities	261,171	220,894
Taxes accrued	339,966	457,392
Accrued interest	175,849	172,901
Dividends payable	182,795	172,456
Derivative instruments	28,019	26,959
Other	439,917	503,953
Total current liabilities	3,690,704	3,247,043
Deferred credits and other liabilities
Deferred income taxes	7,130,715	6,784,319
Deferred investment tax credits	60,659	63,216
Regulatory liabilities	1,386,675	1,383,212
Asset retirement obligations	2,849,532	2,782,229
Derivative instruments	136,255	148,146
Customer advances	190,640	195,214
Pension and employee benefit obligations	975,606	1,112,366
Other	225,215	223,965
Total deferred credits and other liabilities	12,955,297	12,692,667
Commitments and contingencies
Capitalization
Long-term debt	14,091,833	14,194,718
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 507,762,881 and 507,222,795 shares outstanding at June 30, 2017 and Dec. 31, 2016, respectively	1,269,407	1,268,057
Additional paid in capital	5,881,475	5,881,494
Retained earnings	4,079,068	3,981,652
Accumulated other comprehensive loss	(106,795)	(110,354)
Total common stockholders’ equity	11,123,155	11,020,849
Total liabilities and equity	$ 41,860,989	$ 41,155,277

XML

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Capitalization, Long-term Debt and Equity
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares outstanding (in shares)	507,762,881	507,222,795

XML

CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2015	$ 10,600,920	$ 1,268,839	$ 5,889,106	$ 3,552,728	$ (109,753)
Balance (in shares) at Dec. 31, 2015		507,536,000
Increase (Decrease) in Stockholders' Equity
Net income	438,107			438,107
Other comprehensive income	2,958				2,958
Dividends declared on common stock	(347,182)			(347,182)
Issuances of common stock (in shares)		417,000
Issuances of common stock	(2,899)	$ 1,043	(3,942)
Repurchases of common stock	(789)		(789)
Share-based compensation	12,019		12,019
Ending balance at Jun. 30, 2016	10,703,134	$ 1,269,882	5,896,394	3,643,653	(106,795)
Balance (in shares) at Jun. 30, 2016		507,953,000
Beginning balance at Mar. 31, 2016	10,671,634	$ 1,269,882	5,889,939	3,620,421	(108,608)
Balance (in shares) at Mar. 31, 2016		507,953,000
Increase (Decrease) in Stockholders' Equity
Net income	196,795			196,795
Other comprehensive income	1,813				1,813
Dividends declared on common stock	(173,563)			(173,563)
Issuances of common stock (in shares)		0
Issuances of common stock	(187)	$ 0	(187)
Share-based compensation	6,642		6,642
Ending balance at Jun. 30, 2016	10,703,134	$ 1,269,882	5,896,394	3,643,653	(106,795)
Balance (in shares) at Jun. 30, 2016		507,953,000
Beginning balance at Dec. 31, 2016	$ 11,020,849	$ 1,268,057	5,881,494	3,981,652	(110,354)
Balance (in shares) at Dec. 31, 2016	507,222,795	507,223,000
Increase (Decrease) in Stockholders' Equity
Net income	$ 466,533			466,533
Other comprehensive income	3,559				3,559
Dividends declared on common stock	(367,553)			(367,553)
Issuances of common stock (in shares)		611,000
Issuances of common stock	5,037	$ 1,527	3,510
Purchase of common stock (in shares)		(71,000)
Repurchases of common stock	(3,120)	$ (177)	(2,943)
Share-based compensation	(2,150)		(586)	(1,564)
Ending balance at Jun. 30, 2017	$ 11,123,155	$ 1,269,407	5,881,475	4,079,068	(106,795)
Balance (in shares) at Jun. 30, 2017	507,762,881	507,763,000
Beginning balance at Mar. 31, 2017	$ 11,070,111	$ 1,269,407	5,872,933	4,036,352	(108,581)
Balance (in shares) at Mar. 31, 2017		507,763,000
Increase (Decrease) in Stockholders' Equity
Net income	227,256			227,256
Other comprehensive income	1,786				1,786
Dividends declared on common stock	(183,738)			(183,738)
Share-based compensation	7,740		8,542	(802)
Ending balance at Jun. 30, 2017	$ 11,123,155	$ 1,269,407	$ 5,881,475	$ 4,079,068	$ (106,795)
Balance (in shares) at Jun. 30, 2017	507,762,881	507,763,000

XML

Management's Opinion

6 Months Ended

Jun. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Management's Opinion

In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments necessary to present fairly, in accordance with accounting principles generally accepted in the United States of America (GAAP), the financial position of Xcel Energy Inc. and its subsidiaries as of June 30, 2017 and Dec. 31, 2016; the results of its operations, including the components of net income and comprehensive income, and changes in stockholders’ equity for the three and six months endedJune 30, 2017 and 2016; and its cash flows for the six months endedJune 30, 2017 and 2016. All adjustments are of a normal, recurring nature, except as otherwise disclosed. Management has also evaluated the impact of events occurring after June 30, 2017 up to the date of issuance of these consolidated financial statements. These statements contain all necessary adjustments and disclosures resulting from that evaluation.The Dec. 31, 2016 balance sheet information has been derived from the audited 2016 consolidated financial statements included in the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016. These notes to the consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for Quarterly Reports on Form 10-Q. Certain information and note disclosures normally included in financial statements prepared in accordance with GAAP on an annual basis have been condensed or omitted pursuant to such rules and regulations. For further information, refer to the consolidated financial statements and notes thereto, included in the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016, filed with the SEC on Feb. 24, 2017. Due to the seasonality of Xcel Energy’s electric and natural gas sales, interim results are not necessarily an appropriate base from which to project annual results.

XML

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

The significant accounting policies set forth in Note 1 to the consolidated financial statements in the Xcel Energy Inc. Annual Report on Form 10-K for the year ended Dec. 31, 2016, appropriately represent, in all material respects, the current status of accounting policies and are incorporated herein by reference.

XML

Accounting Pronouncements

6 Months Ended

Jun. 30, 2017

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Accounting Pronouncements

Accounting Pronouncements

Recently Issued

Revenue Recognition— In May 2014, the Financial Accounting Standards Board (FASB) issued Revenue from Contracts with Customers, Topic 606 (Accounting Standards Update (ASU) No. 2014-09), which provides a new framework for the recognition of revenue. Xcel Energy expects its adoption will result in increased disclosures regarding revenue, cash flows and obligations related to arrangements with customers, as well as separate presentation of alternative revenue programs. Xcel Energy has not yet fully determined the impacts of adoption for several aspects of the standard, including a determination whether and how much an evaluation of the collectability of regulated electric and gas revenues will impact the amounts of revenue recognized upon delivery. Xcel Energy currently expects to implement the standard on a modified retrospective basis, which requires application to contracts with customers effective Jan. 1, 2018, with the cumulative impact on contracts not yet completed as of Dec. 31, 2017 recognized as an adjustment to the opening balance of retained earnings.

Classification and Measurement of Financial Instruments — In January 2016, the FASB issued Recognition and Measurement of Financial Assets and Financial Liabilities, Subtopic 825-10 (ASU No. 2016-01), which eliminates the available-for-sale classification for marketable equity securities and also replaces the cost method of accounting for non-marketable equity securities with a model for recognizing impairments and observable price changes. Under the new standard, other than when the consolidation or equity method of accounting is utilized, changes in the fair value of equity securities are to be recognized in earnings. This guidance will be effective for interim and annual reporting periods beginning after Dec. 15, 2017. Xcel Energy expects that as a result of application of accounting principles for rate regulated entities, changes in the fair value of the securities in the nuclear decommissioning fund, currently classified as available-for-sale, will continue to be deferred to a regulatory asset, and that the overall impacts of the Jan. 1, 2018 adoption will not be material.

Leases —In February 2016, the FASB issued Leases, Topic 842 (ASU No. 2016-02), which for lessees requires balance sheet recognition of right-of-use assets and lease liabilities for most leases. This guidance will be effective for interim and annual reporting periods beginning after Dec. 15, 2018. Xcel Energy has not yet fully determined the impacts of implementation. However, adoption is expected to occur on Jan. 1, 2019 utilizing the practical expedients provided by the standard. As such, agreements entered prior to Jan. 1, 2017 that are currently considered leases are expected to be recognized on the consolidated balance sheet, including contracts for use of office space, equipment and natural gas storage assets, as well as certain purchased power agreements (PPAs) for natural gas-fueled generating facilities. Xcel Energy expects that similar agreements entered after Dec. 31, 2016 will generally qualify as leases under the new standard, but has not yet completed its evaluation of certain other contracts, including arrangements for the secondary use of assets, such as land easements.

Presentation of Net Periodic Benefit Cost —In March 2017, the FASB issued Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Topic 715 (ASU No. 2017-07), which establishes that only the service cost element of pension cost may be presented as a component of operating income in the income statement. Also under the guidance, only the service cost component of pension cost is eligible for capitalization. Xcel Energy has not yet fully determined the impacts of adoption of the standard, but expects that as a result of application of accounting principles for rate regulated entities, a similar amount of pension cost, including non-service components, will be recognized consistent with the current ratemaking treatment and that the impacts of adoption will be limited to changes in classification of non-service costs in the consolidated statement of income. This guidance will be effective for interim and annual reporting periods beginning after Dec. 15, 2017.

Recently Adopted

Stock Compensation —In March 2016, the FASB issued Improvements to Employee Share-Based Payment Accounting, Topic 718 (ASU No. 2016-09), which simplifies accounting and financial statement presentation for share-based payment transactions. The guidance requires that the difference between the tax deduction available upon settlement of share-based equity awards and the tax benefit accumulated over the vesting period be recognized as an adjustment to income tax expense. Xcel Energy adopted the guidance in 2016, resulting in immaterial 2016 adjustments to income tax expense and changes in classification of cash flows related to tax withholding in the consolidated statements of cash flows for the years ended Dec. 31, 2016, 2015 and 2014.

XML

Selected Balance Sheet Data

6 Months Ended

Jun. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Selected Balance Sheet Data

Selected Balance Sheet Data

(Thousands of Dollars)	June 30, 2017			Dec. 31, 2016
Accounts receivable, net
Accounts receivable	$	808,705		$	827,112
Less allowance for bad debts	(49,327		)	(50,823		)
	$	759,378		$	776,289

(Thousands of Dollars)	June 30, 2017		Dec. 31, 2016
Inventories
Materials and supplies	$	321,426	$	312,430
Fuel	156,736		181,752
Natural gas	63,882		110,044
	$	542,044	$	604,226

(Thousands of Dollars)	June 30, 2017			Dec. 31, 2016
Property, plant and equipment, net
Electric plant	$	38,810,158		$	38,220,765
Natural gas plant	5,465,224			5,317,717
Common and other property	1,959,703			1,888,518
Plant to be retired (a)	17,820			31,839
Construction work in progress	1,571,362			1,373,380
Total property, plant and equipment	47,824,267			46,832,219
Less accumulated depreciation	(14,703,391		)	(14,381,603		)
Nuclear fuel	2,660,606			2,571,770
Less accumulated amortization	(2,237,639		)	(2,180,636		)
	$	33,543,843		$	32,841,750

^(a)  In the second half of 2017, PSCo expects to both early retire Valmont Unit 5 and convert Cherokee Unit 4 from a coal-fueled generating facility to natural gas. PSCo also expects Craig Unit 1 to be early retired in approximately 2025. Amounts are presented net of accumulated depreciation.

XML

Income Taxes

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Except to the extent noted below, Note 6 to the consolidated financial statements included in Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 appropriately represents, in all material respects, the current status of other income tax matters, and are incorporated herein by reference.

Federal Loss Carryback Claims — In 2012-2015, Xcel Energy identified certain expenses related to 2009, 2010, 2011, 2013, 2014 and 2015 that qualify for an extended carryback beyond the typical two-year carryback period. As a result of a higher tax rate in prior years, Xcel Energy recognized a tax benefit of approximately $5 million in 2015, $17 million in 2014, $12 million in 2013 and $15 million in 2012.

Federal Audits— Xcel Energy files a consolidated federal income tax return. The statute of limitations applicable to Xcel Energy’s 2009 through 2013 federal income tax returns, following extensions, expires in December 2017.

In 2012, the Internal Revenue Service (IRS) commenced an examination of tax years 2010 and 2011, including the 2009 carryback claim. The IRS has proposed an adjustment to the federal tax loss carryback claims that would result in $14 million of income tax expense for the 2009 through 2011 claims, and the 2013 through 2015 claims. In 2016 the IRS audit team and Xcel Energy presented their cases to the Office of Appeals; however, the outcome and timing of a resolution is uncertain.

In the third quarter of 2015, the IRS commenced an examination of tax years 2012 and 2013. In the second quarter of 2017, the IRS proposed an adjustment to tax year 2012 that may impact Xcel Energy’s net operating loss (NOL) and effective tax rate (ETR). Xcel Energy is evaluating the IRS’ proposal and the outcome and timing of a resolution is uncertain.

State Audits—Xcel Energy files consolidated state tax returns based on income in its major operating jurisdictions of Colorado, Minnesota, Texas, and Wisconsin, and various other state income-based tax returns. As of June 30, 2017, Xcel Energy’s earliest open tax years that are subject to examination by state taxing authorities in its major operating jurisdictions were as follows:

State	Year
Colorado	2009
Minnesota	2009
Texas	2009
Wisconsin	2012

• In 2016, Minnesota began an audit of years 2010 through 2014. As of June 30, 2017, Minnesota had not proposed any adjustments;

• In 2016, Texas began an audit of years 2009 and 2010. As of June 30, 2017, Texas had not proposed any material adjustments;

• In 2016, Wisconsin began an audit of years 2012 and 2013. As of June 30, 2017, Wisconsin had not proposed any material adjustments; and

• As of June 30, 2017, there were no other state income tax audits in progress.

Unrecognized Benefits — The unrecognized tax benefit balance includes permanent tax positions, which if recognized would affect the annual ETR. In addition, the unrecognized tax benefit balance includes temporary tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. A change in the period of deductibility would not affect the ETR but would accelerate the payment of cash to the taxing authority to an earlier period.

A reconciliation of the amount of unrecognized tax benefit is as follows:

(Millions of Dollars)	June 30, 2017		Dec. 31, 2016
Unrecognized tax benefit — Permanent tax positions	$	30.8	$	29.6
Unrecognized tax benefit — Temporary tax positions	106.6		104.1
Total unrecognized tax benefit	$	137.4	$	133.7

The unrecognized tax benefit amounts were reduced by the tax benefits associated with NOL and tax credit carryforwards. The amounts of tax benefits associated with NOL and tax credit carryforwards are as follows:

(Millions of Dollars)	June 30, 2017			Dec. 31, 2016
NOL and tax credit carryforwards	$	(47.4	)	$	(43.8	)

It is reasonably possible that Xcel Energy’s amount of unrecognized tax benefits could significantly change in the next 12 months as the IRS Appeals and audit progress, the Minnesota, Texas and Wisconsin audits progress, and other state audits resume. As the IRS Appeals and IRS, Minnesota, Texas and Wisconsin audits progress, it is reasonably possible that the amount of unrecognized tax benefit could decrease up to approximately $61 million.

The payable for interest related to unrecognized tax benefits is partially offset by the interest benefit associated with NOL and tax credit carryforwards. A reconciliation of the beginning and ending amount of the payable for interest related to unrecognized tax benefits are as follows:

(Millions of Dollars)	June 30, 2017			Dec. 31, 2016
Payable for interest related to unrecognized tax benefits at beginning of period	$	(3.4	)	$	(0.1	)
Interest expense related to unrecognized tax benefits recorded during the period	(1.7		)	(3.3		)
Payable for interest related to unrecognized tax benefits at end of period	$	(5.1	)	$	(3.4	)

No amounts were accrued for penalties related to unrecognized tax benefits as of June 30, 2017 or Dec. 31, 2016.

XML

Rate Matters

6 Months Ended

Jun. 30, 2017

Public Utilities, General Disclosures [Abstract]

Rate Matters

Rate Matters

Except to the extent noted below, the circumstances set forth in Note 12 to the consolidated financial statements included in Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016 and in Note 5 to Xcel Energy Inc.’s Quarterly Report on

Form 10-Q for the quarterly period ended March 31, 2017, appropriately represent, in all material respects, the current status of other rate matters, and are incorporated herein by reference.

NSP-Minnesota

Pending and Recently Concluded Regulatory Proceedings — Minnesota Public Utilities Commission (MPUC)

Minnesota 2016 Multi-Year Electric Rate Case — In June 2017, the MPUC issued a written order. NSP-Minnesota estimates the total rate increase to be approximately $245 million over the four-year period covering 2016-2019.

Key terms:

• Four-year period covering 2016-2019;

• Annual sales true-up;

• Return on equity (ROE) of 9.2 percent and an equity ratio of 52.5 percent;

• Nuclear related costs will not be considered provisional;

• Continued use of all existing riders, however no new riders may be utilized during the four-year term;

• Deferral of incremental 2016 property tax expense above a fixed threshold to 2018 and 2019;

• Four-year stay-out provision for rate cases;

• Property tax true-up mechanism for 2017-2019; and

• Capital expenditure true-up mechanism for 2016-2019.

(Millions of Dollars, incremental)	2016		2017		2018		2019			Total
Revenues	$	74.99	$	59.86	$	—	$	50.12		$	184.97
NSP-Minnesota’s sales true-up	59.95		—		—		(0.20		)	59.75
Total rate impact	$	134.94	$	59.86	$	—	$	49.92		$	244.72

Annual Automatic Adjustment of Fuel Clause Charges — In 2016, the Minnesota Department of Commerce (DOC) recommended the MPUC should hold utilities responsible for incremental costs of replacement power incurred due to unplanned outages at nuclear facilities under certain circumstances. In May 2017, the MPUC voted to disallow approximately $4.4 million of replacement energy costs for the Prairie Island (PI) nuclear facility outages allocated to the Minnesota jurisdiction in 2015. This disallowance was recognized in the second quarter of 2017. The MPUC issued a written order in July 2017. In addition, the DOC is currently reviewing nuclear costs and operations under the initial rate case and resource plan orders as well as the recently finalized rate case.

NSP-Wisconsin

Pending Regulatory Proceeding — Public Service Commission of Wisconsin (PSCW)

Wisconsin 2018 Electric and Natural Gas Rate Case— In May 2017, NSP-Wisconsin filed a request with the PSCW to increase electric rates by $24.7 million, or 3.6 percent, and natural gas rates by $12.0 million, or 10.1 percent, effective January 2018. The rate filing is based on a 2018 forecast test year, a ROE of 10.0 percent, an equity ratio of 52.53 percent and a forecasted average net investment rate base of approximately $1.2 billion for the electric utility and $138.4 million for the natural gas utility.

Key dates in the procedural schedule are as follows:

• Staff and intervenor testimony — Sept. 12, 2017;

• Rebuttal testimony — Sept. 26, 2017;

• Sur-rebuttal testimony — Oct. 3, 2017; and

• Hearing — Oct. 5, 2017.

A PSCW decision is anticipated in the fourth quarter of 2017.

PSCo

Pending and Recently Concluded Regulatory Proceedings — Colorado Public Utilities Commission (CPUC)

Multi-Year Natural Gas Rate Case — In June 2017, PSCo filed a multi-year request with the CPUC seeking to increase retail natural gas rates to recover capital investments and increased operating costs since PSCo’s previous case in 2015. The request, detailed below, is based on forecast test years, a 10.0 percent ROE and an equity ratio of 55.25 percent.

Revenue Request (Millions of Dollars)	2018		2019		2020		Total
New revenue request	$	63.2	$	32.9	$	42.9	$	139.0
Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates (a)	—		93.9		—		93.9
Total	$	63.2	$	126.8	$	42.9	$	232.9
Expected Year-End Rate Base (Billions of dollars) (b)	$	1.5	$	2.3	$	2.4	N/A

^(a) The roll-in of PSIA rider revenue into base rates will not have an impact on customer bills or total revenue as these costs are already being recovered from customers through the rider. PSCo plans to request new PSIA rates for 2018 in November 2017. The recovery of new, incremental PSIA related investments in 2019 and 2020 are included in the base rate request.

^(b) The additional rate base in 2019 predominantly reflects the roll-in of capital associated with the PSIA rider.

Final rates are expected to be effective in February 2018. In conjunction with the multi-year base rate step increases, PSCo is also proposing a stay-out provision and an earnings test through the end of 2020.

Annual Electric Earnings Test — PSCo must share with customers earnings that exceed the authorized ROE of 9.83 percent for 2015 through 2017, as part of an annual earnings test. In July 2017, the CPUC approved PSCo’s 2016 earnings test, which does not result in any earnings sharing. The current estimate of the 2017 earnings test, based on annual forecasted information, did not result in the recognition of a liability as of June 30, 2017.

SPS

Pending and Recently Concluded Regulatory Proceedings — Public Utility Commission of Texas (PUCT)

Appeal of the Texas 2015 Electric Rate Case Decision — In 2014, SPS had requested an overall retail electric revenue rate increase of $42.1 million. In 2015, the PUCT approved an overall rate decrease of approximately $4.0 million, net of rate case expenses. In April 2016, SPS filed an appeal, with the Texas State District Court, of the PUCT’s order that had denied SPS’ request for rehearing on certain items in SPS’ Texas 2015 electric rate case related to capital structure, incentive compensation and wholesale load reductions. In March 2017, the Travis County District Court denied SPS’ appeal.  In April 2017, SPS appealed the District Court’s decision to the Court of Appeals.

Texas 2016 Transmission Cost Recovery Factor (TCRF) Application — In February 2017, SPS filed with the PUCT to recover additional annual revenue of approximately $16.1 million through its TCRF, or 1.8 percent. The filing was based upon capital transmission additions made during 2016. In June 2017, the PUCT approved TCRF rider recovery of approximately $14.4 million effective immediately.

Pending Regulatory Proceeding — New Mexico Public Regulation Commission (NMPRC)

New Mexico 2016 Electric Rate Case — In November 2016, SPS filed an electric rate case with the NMPRC seeking an increase in base rates of approximately $41.4 million, representing a total revenue increase of approximately 10.9 percent. The rate filing is based on a requested ROE of 10.1 percent, an equity ratio of 53.97 percent, an electric rate base of approximately $832 million and a future test year ending June 30, 2018.

On April 10, 2017, the hearing examiner determined that SPS’ rate filing was deficient and recommended the NMPRC extend the procedural schedule by approximately one month and restart the suspension period once it is determined that the deficiencies are resolved. On April 19, 2017, the NMPRC dismissed SPS’ rate case. On May 15, 2017, SPS filed a notice of appeal to the New Mexico Supreme Court. A decision from the New Mexico Supreme Court is not expected until the second or third quarter of 2018.

Pending Regulatory Proceeding — Federal Energy Regulatory Commission (FERC)

Midcontinent Independent System Operator, Inc. (MISO) ROE Complaints — In November 2013, a group of customers filed a complaint at the FERC against MISO transmission owners (TOs), including NSP-Minnesota and NSP-Wisconsin. The complaint argued for a reduction in the ROE in transmission formula rates in the MISO region from 12.38 percent to 9.15 percent, and the removal of ROE adders (including those for Regional Transmission Organization (RTO) membership), effective Nov. 12, 2013.

In December 2015, an administrative law judge (ALJ) recommended the FERC approve a base ROE of 10.32 percent for the MISO TOs. The ALJ found the existing 12.38 percent ROE to be unjust and unreasonable. The recommended 10.32 percent ROE applied a FERC ROE policy adopted in a June 2014 order (Opinion 531). The FERC approved the ALJ recommended 10.32 percent base ROE in an order issued in September 2016. This ROE would be applicable for the 15 month refund period from Nov. 12, 2013 to Feb. 11, 2015, and prospectively from the date of the FERC order. The total prospective ROE would be 10.82 percent, including a 50 basis point adder for RTO membership. Various parties requested rehearing of the September 2016 order. The requests are pending FERC action.

In February 2015, a second complaint seeking to reduce the MISO ROE from 12.38 percent to 8.67 percent prior to any adder was filed with the FERC, resulting in a second period of potential refund from Feb. 12, 2015 to May 11, 2016. In June 2016, the ALJ recommended a ROE of 9.7 percent, applying the methodology adopted by the FERC in Opinion 531. A final FERC decision on the second ROE complaint was expected later in 2017, but in April 2017, the United States Court of Appeals for the District of Columbia Circuit (D.C. Circuit) by opinion, vacated and remanded Opinion 531. It is unclear how the D.C. Circuit’s opinion to vacate and remand Opinion 531 will affect the September 2016 FERC order or the timing and outcome of the second ROE complaint. The MISO TOs are evaluating the impact of the D.C. Circuit ruling on the November 2013 and February 2015 ROE complaints.

As of June 30, 2017, NSP-Minnesota has processed the refunds for the Nov. 12, 2013 to Feb. 11, 2015 complaint period based on the 10.32 percent ROE provided in the September 2016 FERC order. NSP-Minnesota has also recognized a current refund liability consistent with the best estimate of the final ROE for the Feb. 12, 2015 to May 11, 2016 complaint period.

XML

Commitments and Contingencies

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Except to the extent noted below and in Note 5 above, the circumstances set forth in Notes 12, 13 and 14 to the consolidated financial statements included in Xcel Energy Inc.’s Annual Report on Form 10-K for the year ended Dec. 31, 2016, and in Notes 5 and 6 to the

consolidated financial statements included in Xcel Energy Inc.’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017 appropriately represent, in all material respects, the current status of commitments and contingent liabilities and are incorporated herein by reference. The following include commitments, contingencies and unresolved contingencies that are material to Xcel Energy’s financial position.

PPAs

Under certain PPAs, NSP-Minnesota, PSCo and SPS purchase power from independent power producing entities for which the utility subsidiaries are required to reimburse natural gas or biomass fuel costs, or to participate in tolling arrangements under which the utility subsidiaries procure the natural gas required to produce the energy that they purchase. These specific PPAs create a variable interest in the associated independent power producing entity.

The Xcel Energy utility subsidiaries had approximately 3,537 megawatts (MW) of capacity under long-term PPAs as of June 30, 2017 and Dec. 31, 2016, with entities that have been determined to be variable interest entities. Xcel Energy has concluded that these entities are not required to be consolidated in its consolidated financial statements because it does not have the power to direct the activities that most significantly impact the entities’ economic performance. These agreements have expiration dates through 2041.

Guarantees and Bond Indemnifications

Xcel Energy Inc. and its subsidiaries provide guarantees and bond indemnities under specified agreements or transactions. The guarantees and bond indemnities issued by Xcel Energy Inc. guarantee payment or performance by its subsidiaries. As a result, Xcel Energy Inc.’s exposure under the guarantees and bond indemnities is based upon the net liability of the relevant subsidiary under the specified agreements or transactions. Most of the guarantees and bond indemnities issued by Xcel Energy Inc. and its subsidiaries have a stated maximum guarantee or indemnity amount. As of June 30, 2017 and Dec. 31, 2016, Xcel Energy Inc. and its subsidiaries had no assets held as collateral related to their guarantees, bond indemnities and indemnification agreements.

The following table presents guarantees and bond indemnities issued and outstanding for Xcel Energy:

(Millions of Dollars)	June 30, 2017		Dec. 31, 2016
Guarantees issued and outstanding	$	18.3	$	18.8
Current exposure under these guarantees	—		0.1
Bonds with indemnity protection	49.4		43.0

Other Indemnification Agreements

Xcel Energy Inc. and its subsidiaries provide indemnifications through contracts entered into in the normal course of business. These are primarily indemnifications against adverse litigation outcomes in connection with underwriting agreements, as well as breaches of representations and warranties, including corporate existence, transaction authorization and income tax matters with respect to assets sold. Xcel Energy Inc.’s and its subsidiaries’ obligations under these agreements may be limited in terms of duration and amount. The maximum future payments under these indemnifications cannot be reasonably estimated as the dollar amounts are often not explicitly stated.

Environmental Contingencies

Ashland Manufactured Gas Plant (MGP) Site — NSP-Wisconsin was named a potentially responsible party (PRP) for contamination at a site in Ashland, Wis. The Ashland/Northern States Power Lakefront Superfund Site (the Site) includes NSP-Wisconsin property, previously operated as a MGP facility (the Upper Bluff), and two other properties: an adjacent city lakeshore park area (Kreher Park); and an area of Lake Superior’s Chequamegon Bay adjoining the park.

In 2012, NSP-Wisconsin agreed to remediate the Phase I Project Area (which includes the Upper Bluff and Kreher Park areas of the Site), under a settlement agreement with the United States Environmental Protection Agency (EPA).

NSP-Wisconsin performed a wet dredge pilot study in 2016 and demonstrated that a wet dredge remedy can meet the performance standards for remediation of the Phase II Project Area (the Sediments). As a result, the EPA authorized NSP-Wisconsin to extend the wet dredge pilot to additional areas of the Site. In January 2017, NSP-Wisconsin agreed to remediate the Sediments, under a settlement agreement with the EPA. The settlement was approved by the U.S. District Court for the Western District of Wisconsin. NSP-Wisconsin has initiated field activities to perform a full scale wet dredge remedy of the Sediments in 2017, with performance of restoration activities in 2018.

The current cost estimate for the entire site is approximately $160.0 million, of which approximately $113.2 million has been spent. At June 30, 2017 and Dec. 31, 2016, NSP-Wisconsin had recorded a total liability of $46.8 million and $64.3 million, respectively, for the entire site.

NSP-Wisconsin has deferred the unrecovered portion of the estimated Site remediation costs as a regulatory asset. The PSCW has authorized NSP-Wisconsin rate recovery for all remediation costs incurred at the Site. In 2012, the PSCW agreed to allow NSP-Wisconsin to pre-collect certain costs, to amortize costs over a ten-year period and to apply a three percent carrying cost to the unamortized regulatory asset. In May 2017, NSP-Wisconsin filed a natural gas rate case which included recovery of additional expenses associated with remediating the Site. If approved, the annual recovery of MGP clean-up costs would increase from $12.4 million in 2017 to $18.1 million in 2018.

Fargo, N.D. MGP Site — In May 2015, underground pipes, tars and impacted soils were discovered in a right-of-way in Fargo, N.D. that appeared to be associated with a former MGP operated by NSP-Minnesota or prior companies. NSP-Minnesota removed impacted soils and other materials from the right-of-way and commenced an investigation of the historic MGP and adjacent properties (the Fargo MGP Site). NSP-Minnesota has recommended that targeted source removal of impacted soils and historic MGP infrastructure should be performed. The North Dakota Department of Health approved NSP-Minnesota’s proposed cleanup plan in January 2017. The timing and final scope of remediation is dependent on whether reasonable access is provided to NSP-Minnesota to perform and implement the approved cleanup plan. NSP-Minnesota has also initiated insurance recovery litigation in North Dakota. The U.S. District Court for the District of North Dakota agreed to the parties’ request for a stay of the litigation until September 2017.

As of June 30, 2017 and Dec. 31, 2016, NSP-Minnesota had recorded a liability of $16.4 million and $11.3 million, respectively, for the Fargo MGP Site. The current cost estimate for the remediation of the site is approximately $23.0 million, of which approximately $6.6 million has been spent. In December 2015, the North Dakota Public Service Commission (NDPSC) approved NSP-Minnesota’s request to defer costs associated with the Fargo MGP Site, resulting in deferral of all investigation and response costs with the exception of approximately 12 percent allocable to the Minnesota jurisdiction. Uncertainties related to the liability recognized include obtaining access to perform the approved remediation (including the prospective purchase of the historic MGP property), final designs that will be developed to implement the approved cleanup plan and the potential for contributions from entities that may be identified as PRPs.

Other MGP and Landfill Sites — Xcel Energy is currently involved in investigating and/or remediating several other MGP and landfill sites. Xcel Energy has identified ten sites across its service territories in addition to the sites in Ashland, Wis. and Fargo, N.D., where former MGP or landfill disposal activities have or may have resulted in site contamination and are under current investigation and/or remediation. At some or all of these sites, there are other parties that may have responsibility for some portion of any remediation. Xcel Energy anticipates that the majority of the investigation or remediation at these sites will continue through at least 2018. Xcel Energy had accrued $2.9 million and $2.0 million for these sites at June 30, 2017 and Dec. 31, 2016, respectively. There may be insurance recovery and/or recovery from other PRPs to offset any costs incurred. Xcel Energy anticipates that any significant amounts incurred will be recovered from customers.

Environmental Requirements

Water and Waste

Federal Clean Water Act (CWA) Waters of the United States Rule —In 2015, the EPA and the U.S. Army Corps of Engineers (Corps) published a final rule that significantly expands the types of water bodies regulated under the CWA and broadens the scope of waters subject to federal jurisdiction. The final rule will subject more utility projects to federal CWA jurisdiction, thereby potentially delaying the siting of new generation projects, pipelines, transmission lines and distribution lines, as well as increasing project costs and expanding permitting and reporting requirements. In October 2015, the U.S. Court of Appeals for the Sixth Circuit issued a nationwide stay of the final rule and subsequently ruled that it, rather than the federal district courts, had jurisdiction over challenges to the rule.  In January 2017, the U.S. Supreme Court agreed to resolve the dispute as to which court should hear challenges to the rule. A ruling is expected by the end of 2017.

In February 2017, President Trump issued an executive order requiring the EPA and the Corps to review and revise the final rule. On June 27, 2017, the agencies issued a proposed rule that rescinds the 2015 final rule and reinstates the prior 1986 definition of “Water of the U.S.”

Air

Greenhouse Gas (GHG) Emission Standard for Existing Sources (Clean Power Plan or CPP) — In 2015, the EPA issued its final rule for existing power plants.  Among other things, the rule requires that state plans include enforceable measures to ensure emissions from existing power plants achieve the EPA’s state-specific interim (2022-2029) and final (2030 and thereafter) emission performance targets. 

The CPP was challenged by multiple parties in the D.C. Circuit Court.  In February 2016, the U.S. Supreme Court issued an order staying the final CPP rule. In September 2016, the D.C. Circuit Court heard oral arguments in the consolidated challenges to the CPP. The stay will remain in effect until the D.C. Circuit Court reaches its decision and the U.S. Supreme Court either declines to review the lower court’s decision or reaches a decision of its own.

In March 2017, President Trump signed an executive order requiring the EPA Administrator to review the CPP rule and if appropriate, publish proposed rules suspending, revising or rescinding it. Accordingly, the EPA has requested that the D.C. Circuit Court hold the litigation in abeyance until the EPA completes its work under the executive order. The D.C. Circuit granted the EPA’s request to hold the litigation in abeyance until June 27, 2017, and is considering briefs by the parties on whether the court should remand the challenges to the EPA rather than holding them in abeyance, to determine whether and how the court continues or ends the stay that currently applies to the CPP. On June 9, 2017, the EPA submitted a proposed rule to the Office of Management and Budget entitled “Review of the Clean Power Plan.”

Regional Haze Rules — The regional haze program is designed to address widespread haze that results from emissions from a multitude of sources. The Best Available Retrofit Technology (BART) requirements of the EPA’s regional haze rules require the installation and operation of emission controls for industrial facilities emitting air pollutants that reduce visibility in national parks and wilderness areas. Under BART, regional haze plans identify facilities that will have to reduce Sulfur Dioxide (SO₂₎, Nitrogen Oxide (NOx) and particulate matter emissions and set emission limits for those facilities. BART requirements can also be met through participation in interstate emission trading programs such as the Clean Air Interstate Rule (CAIR) and its successor, Cross-State Air Pollution Rule (CSAPR). The regional haze plans developed by Minnesota and Colorado have been fully approved and are being implemented in those states. States are required to revise their plans every ten years. The next plans for Minnesota and Colorado will be due in 2021. Texas’ first regional haze plan is still undergoing federal review as described below. President Trump’s Administration has not yet taken any public position regarding its views of the proposed and final regional haze regulations affecting SPS facilities in Texas. 

Actions affecting Harrington Units: Texas developed a State Implementation Plan (SIP) that finds the CAIR equal to BART for electric generating units. As a result, no additional controls beyond CAIR compliance would be required. In 2014, the EPA proposed to approve the BART portion of the SIP, with substitution of CSAPR compliance for Texas’ reliance on CAIR. In January 2016, the EPA adopted a final rule that defers its approval of CSAPR compliance as BART until the EPA considers further adjustments to CSAPR emission budgets under the D.C. Circuit Court’s remand of the Texas SO₂ emission budgets. In June 2016, the EPA issued a memorandum which allows Texas to voluntarily adopt the CSAPR emission budgets limiting annual SO₂ and NOx emissions and rely on those emission budgets to satisfy Texas’ BART obligations under the regional haze rules. The Texas Commission on Environmental Quality has not utilized this option. The EPA then published a proposed rule in January 2017 that could have the effect of requiring installation of dry scrubbers to reduce SO₂ emissions from Harrington Units 1 and 2. Investment costs associated with dry scrubbers for Harrington Units 1 and 2 could be approximately $400 million. The EPA’s deadline to issue a final rule for Texas is September 2017.

Actions affecting Tolk units: In January 2016, the EPA adopted a final rule establishing a federal implementation plan for the state of Texas, which imposed SO₂ emission limitations that reflect the installation of dry scrubbers on Tolk Units 1 and 2, with compliance required by February 2021. Investment costs associated with dry scrubbers could be approximately $600 million. SPS appealed the EPA’s decision and requested a stay of the final rule. The United States Court of Appeals for the Fifth Circuit (Fifth Circuit) granted the stay and decided that they are the appropriate venue for this case. In March 2017, the Fifth Circuit remanded the rule to the EPA for reconsideration, while leaving the stay in effect. The Fifth Circuit is now holding the case in abeyance until the EPA completes its reconsideration of the rule. It is likely that Texas and other affected entities including SPS would continue to challenge the determinations to date.  The risk of these controls being imposed along with the risk of investments to provide cooling water to Tolk have caused SPS to seek to decrease the remaining depreciable life of the Tolk units.

Revisions to the National Ambient Air Quality Standard (NAAQS) for Ozone — In 2015, the EPA revised the NAAQS for ozone by lowering the eight-hour standard from 75 parts per billion (ppb) to 70 ppb. In areas where Xcel Energy operates, current monitored air quality concentrations comply with the new standard in the Twin Cities Metropolitan Area in Minnesota and meet the 70 ppb level in the Texas panhandle. In documents issued with the new standard, the EPA projects that both areas will meet the new standard. The Denver Metropolitan Area is currently not meeting the prior ozone standard and will therefore not meet the new, more stringent standard, however PSCo’s scheduled retirement of coal fired plants in Denver that began in 2011 and will be completed in August 2017, should help in any plan to mitigate non-attainment. In June 2017, the EPA announced that it is delaying designations of nonattainment areas under the 2015 ozone NAAQS to October 2018 to allow it to complete its review of the 2015 ozone NAAQS.

Legal Contingencies

Xcel Energy is involved in various litigation matters that are being defended and handled in the ordinary course of business. The assessment of whether a loss is probable or is a reasonable possibility, and whether the loss or a range of loss is estimable, often involves a series of complex judgments about future events. Management maintains accruals for such losses that are probable of being incurred and subject to reasonable estimation. Management is sometimes unable to estimate an amount or range of a reasonably possible loss in certain situations, including but not limited to when (1) the damages sought are indeterminate, (2) the proceedings are in the early stages, or (3) the matters involve novel or unsettled legal theories. In such cases, there is considerable uncertainty regarding the timing or ultimate resolution of such matters, including a possible eventual loss. For current proceedings not specifically reported herein, management does not anticipate that the ultimate liabilities, if any, arising from such current proceedings would have a material effect on Xcel Energy’s financial statements. Unless otherwise required by GAAP, legal fees are expensed as incurred.

Employment, Tort and Commercial Litigation

Gas Trading Litigation — e prime, inc. (e prime) is a wholly owned subsidiary of Xcel Energy. e prime was in the business of natural gas trading and marketing but has not engaged in natural gas trading or marketing activities since 2003.  Thirteen lawsuits were commenced against e prime and Xcel Energy (and NSP-Wisconsin, in two instances) between 2003 and 2009 alleging fraud and anticompetitive activities in conspiring to restrain the trade of natural gas and manipulate natural gas prices.

The cases were consolidated in U.S. District Court in Nevada. Five of the cases have since been settled and seven remain active, which includes one multi-district litigation (MDL) matter consisting of a Colorado class (Breckenridge), a Wisconsin class (NSP-Wisconsin), a Kansas class, and two other cases identified as “Sinclair Oil” and “Farmland.” In November 2016, the MDL judge dismissed e prime and Xcel Energy from the Farmland lawsuit, and Farmland has appealed the dismissal. Motions for summary judgment were filed by defendants, including e prime, in all of the remaining lawsuits. In March 2017, the U.S. District Court issued an order dismissing the claims against e prime in the Sinclair Oil lawsuit and denied plaintiffs motions for class certification in the other lawsuits. The U.S. District Court did not grant e prime’s summary judgment motions in the Wisconsin or Colorado cases. There are currently additional motions brought by e prime for reconsideration and summary judgment pending in the U.S. District Court. Xcel Energy, NSP-Wisconsin and e prime have concluded that a loss is remote.

Line Extension Disputes — In December 2015, Development Recovery Company (DRC) filed a lawsuit in Denver State Court, stating PSCo failed to award proper allowances and refunds for line extensions to new developments pursuant to the terms of electric and gas service agreements entered into by PSCo and various developers. The dispute involves claims by over fifty developers. In May 2016, the district court granted PSCo’s motion to dismiss the lawsuit, concluding that jurisdiction over this dispute resides with the CPUC. In June 2016, DRC appealed the district court’s dismissal of the lawsuit, and the Colorado Court of Appeals affirmed the lower court decision in favor of PSCo. In July 2017, DRC filed a petition to appeal the decision with the Colorado Supreme Court. It is uncertain whether the Colorado Supreme Court will grant the petition. DRC also brought a proceeding before the CPUC as assignee on behalf of two developers, Ryland Homes and Richmond Homes of Colorado. In March 2016, the ALJ issued an order rejecting DRC’s claims for additional allowances and refunds. In June 2016, the ALJ’s determination was approved by the CPUC. DRC did not file a request for reconsideration before the CPUC contesting the decision, but filed an appeal in Denver District Court in August 2016. DRC has requested a hearing for oral arguments, which has yet to be granted or set by the Denver District Court.

PSCo has concluded that a loss is remote with respect to this matter as the service agreements were developed to implement CPUC approved tariffs and PSCo has complied with the tariff provisions. Also, if a loss were sustained, PSCo believes it would be allowed to recover these costs through traditional regulatory mechanisms. The amount or range in dispute is presently unknown and no accrual has been recorded for this matter.

XML

Borrowings and Other Financing Instruments

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Borrowings and Other Financing Instruments

Borrowings and Other Financing Instruments

Short-Term Borrowings

Money Pool— Xcel Energy Inc. and its utility subsidiaries have established a money pool arrangement that allows for short-term investments in and borrowings between the utility subsidiaries. NSP-Wisconsin does not participate in the money pool. Xcel Energy Inc. may make investments in the utility subsidiaries at market-based interest rates; however, the money pool arrangement does not allow the utility subsidiaries to make investments in Xcel Energy Inc. The money pool balances are eliminated in consolidation.

Commercial Paper — Xcel Energy Inc. and its utility subsidiaries meet their short-term liquidity requirements primarily through the issuance of commercial paper and borrowings under their credit facilities. Commercial paper outstanding for Xcel Energy was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended    June 30, 2017			Year Ended    Dec. 31, 2016
Borrowing limit	$	2,750		$	2,750
Amount outstanding at period end	784			392
Average amount outstanding	778			485
Maximum amount outstanding	1,247			1,183
Weighted average interest rate, computed on a daily basis	1.28		%	0.74		%
Weighted average interest rate at period end	1.49			0.95

Letters of Credit— Xcel Energy Inc. and its subsidiaries use letters of credit, generally with terms of one year, to provide financial guarantees for certain operating obligations. At June 30, 2017 and Dec. 31, 2016, there were $14 million and $19 million, respectively, of letters of credit outstanding under the credit facilities. The contract amounts of these letters of credit approximate their fair value and are subject to fees.

Credit Facilities —In order to use their commercial paper programs to fulfill short-term funding needs, Xcel Energy Inc. and its utility subsidiaries must have revolving credit facilities in place at least equal to the amount of their respective commercial paper borrowing limits and cannot issue commercial paper in an aggregate amount exceeding available capacity under these credit facilities. The lines of credit provide short-term financing in the form of notes payable to banks, letters of credit and back-up support for commercial paper borrowings.

At June 30, 2017, Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,000	$	549	$	451
PSCo	700		3		697
NSP-Minnesota	500		91		409
SPS	400		109		291
NSP-Wisconsin	150		46		104
Total	$	2,750	$	798	$	1,952

^(a)  These credit facilities expire in June 2021.

^(b)  Includes outstanding commercial paper and letters of credit.

All credit facility bank borrowings, outstanding letters of credit and outstanding commercial paper reduce the available capacity under the respective credit facilities. Xcel Energy Inc. and its subsidiaries had no direct advances on the credit facilities outstanding at June 30, 2017 and Dec. 31, 2016.

Long-Term Borrowings

PSCo issued $400 million of 3.80 percent first mortgage bonds due June 15, 2047.

XML

Fair Value of Financial Assets and Liabilities

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

Fair Value of Financial Assets and Liabilities

Fair Value Measurements

The accounting guidance for fair value measurements and disclosures provides a single definition of fair value and requires certain disclosures about assets and liabilities measured at fair value. A hierarchical framework for disclosing the observability of the inputs utilized in measuring assets and liabilities at fair value is established by this guidance. The three levels in the hierarchy are as follows:

Level 1 — Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices.

Level 2 — Pricing inputs are other than quoted prices in active markets, but are either directly or indirectly observable as of the reporting date. The types of assets and liabilities included in Level 2 are typically either comparable to actively traded securities or contracts, or priced with models using highly observable inputs.

Level 3 — Significant inputs to pricing have little or no observability as of the reporting date. The types of assets and liabilities included in Level 3 are those valued with models requiring significant management judgment or estimation.

Specific valuation methods include the following:

Cash equivalents— The fair values of cash equivalents are generally based on cost plus accrued interest; money market funds are measured using quoted net asset value (NAV).

Investments in equity securities and other funds— Equity securities are valued using quoted prices in active markets. The fair values for commingled funds are measured using NAVs, which take into consideration the value of underlying fund investments, as well as the other accrued assets and liabilities of a fund, in order to determine a per-share market value. The investments in commingled funds may be redeemed for NAV with proper notice. Proper notice varies by fund and can range from daily with one or two days notice to annually with 90 days notice. Private equity investments require approval of the fund for any unscheduled redemption, and such redemptions may be approved or denied by the fund at its sole discretion. Unscheduled distributions from real estate investments may be redeemed with proper notice, which is typically quarterly with 45-90 days notice; however, withdrawals from real estate investments may be delayed or discounted as a result of fund illiquidity.

Investments in debt securities— Fair values for debt securities are determined by a third party pricing service using recent trades and observable spreads from benchmark interest rates for similar securities.

Interest rate derivatives— The fair values of interest rate derivatives are based on broker quotes that utilize current market interest rate forecasts.

Commodity derivatives— The methods used to measure the fair value of commodity derivative forwards and options utilize forward prices and volatilities, as well as pricing adjustments for specific delivery locations, and are generally assigned a Level 2 classification. When contractual settlements extend to periods beyond those readily observable on active exchanges or quoted by brokers, the significance of the use of less observable forecasts of long-term forward prices and volatilities on a valuation is evaluated, and may result in Level 3 classification.

Electric commodity derivatives held by NSP-Minnesota and SPS include transmission congestion instruments, generally referred to as financial transmission rights (FTRs). FTRs purchased from a RTO are financial instruments that entitle or obligate the holder to monthly revenues or charges based on transmission congestion across a given transmission path. The value of an FTR is derived from, and designed to offset, the cost of transmission congestion. In addition to overall transmission load, congestion is also influenced by the operating schedules of power plants and the consumption of electricity pertinent to a given transmission path. Unplanned plant outages, scheduled plant maintenance, changes in the relative costs of fuels used in generation, weather and overall changes in demand for electricity can each impact the operating schedules of the power plants on the transmission grid and the value of an FTR. The valuation process for FTRs utilizes complex iterative modeling to predict the impacts of forecasted changes in these drivers of transmission system congestion on the historical pricing of FTR purchases.

If forecasted costs of electric transmission congestion increase or decrease for a given FTR path, the value of that particular FTR instrument will likewise increase or decrease. Fair value measurements for FTRs have been assigned a Level 3 given the limited observability of management’s forecasts for several of the inputs to this complex valuation model. Non-trading monthly FTR settlements are included in fuel and purchased energy cost recovery mechanisms as applicable in each jurisdiction, and therefore changes in the fair value of the yet to be settled portions of most FTRs are deferred as a regulatory asset or liability. Given this regulatory treatment and the limited magnitude of FTRs, the numerous unobservable quantitative inputs to the complex model used for valuation of FTRs are insignificant to the consolidated financial statements of Xcel Energy.

Non-Derivative Instruments Fair Value Measurements

Nuclear Decommissioning Fund

The Nuclear Regulatory Commission (NRC) requires NSP-Minnesota to maintain a portfolio of investments to fund the costs of decommissioning its nuclear generating plants. Together with all accumulated earnings or losses, the assets of the nuclear decommissioning fund are legally restricted for the decommissioning the Monticello and PI nuclear generating plants. The fund contains cash equivalents, debt securities, equity securities and other investments – all classified as available-for-sale. NSP-Minnesota plans to reinvest matured securities until decommissioning begins. NSP-Minnesota uses the MPUC approved asset allocation for the escrow and investment targets by asset class for both the escrow and qualified trust.

NSP-Minnesota recognizes the costs of funding the decommissioning of its nuclear generating plants over the lives of the plants, assuming rate recovery of all costs. Given the purpose and legal restrictions on the use of nuclear decommissioning fund assets, realized and unrealized gains on fund investments over the life of the fund are deferred as an offset of NSP-Minnesota’s regulatory asset for nuclear decommissioning costs. Consequently, any realized and unrealized gains and losses on securities in the nuclear decommissioning fund, including any other-than-temporary impairments, are deferred as a component of the regulatory asset for nuclear decommissioning.

Unrealized gains for the nuclear decommissioning fund were $462.3 million and $378.6 million at June 30, 2017 and Dec. 31, 2016, respectively, and unrealized losses and amounts recorded as other-than-temporary impairments were $34.2 million and $46.9 million at June 30, 2017 and Dec. 31, 2016, respectively.

The following tables present the cost and fair value of Xcel Energy’s non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund at June 30, 2017 and Dec. 31, 2016:

	June 30, 2017
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Investments Measured at NAV (b)		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	10,990	$	10,990	$	—	$	—	$	—	$	10,990
Commingled funds:
Non U.S. equities	280,608		191,881		—		—		106,085		297,966
Emerging market debt funds	96,008		—		—		—		103,736		103,736
Commodity funds	106,571		—		—		—		82,897		82,897
Private equity investments	138,889		—		—		—		195,491		195,491
Real estate	131,270		—		—		—		195,515		195,515
Other commingled funds	131,243		—		—		—		141,918		141,918
Debt securities:
Government securities	38,319		—		37,844		—		—		37,844
U.S. corporate bonds	141,510		—		142,330		—		—		142,330
Non U.S. corporate bonds	24,386		—		24,859		—		—		24,859
Equity securities:
U.S. equities	287,425		526,581		—		—		—		526,581
Non U.S. equities	171,695		226,868		—		—		—		226,868
Total	$	1,558,914	$	956,320	$	205,033	$	—	$	825,642	$	1,986,995

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $133.2 million of equity investments in unconsolidated subsidiaries and $111.4 million of rabbi trust assets and miscellaneous investments.

^(b)  Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

	Dec. 31, 2016
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Investments Measured at NAV (b)		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	20,379	$	20,379	$	—	$	—	$	—	$	20,379
Commingled funds:
Non U.S. equities	260,877		133,126		—		—		112,233		245,359
Emerging market debt funds	93,597		—		—		—		97,543		97,543
Commodity funds	106,571		—		—		—		92,091		92,091
Private equity investments	132,190		—		—		—		190,462		190,462
Real estate	128,630		—		—		—		187,647		187,647
Other commingled funds	151,048		—		—		—		159,489		159,489
Debt securities:
Government securities	32,764		—		31,965		—		—		31,965
U.S. corporate bonds	104,913		—		105,772		—		—		105,772
Non U.S. corporate bonds	21,751		—		21,672		—		—		21,672
Municipal bonds	13,609		—		13,786		—		—		13,786
Mortgage-backed securities	2,785		—		2,816		—		—		2,816
Equity securities:
U.S. equities	270,779		473,400		—		—		—		473,400
Non U.S. equities	189,100		218,381		—		—		—		218,381
Total	$	1,528,993	$	845,286	$	176,011	$	—	$	839,465	$	1,860,762

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $132.8 million of equity investments in unconsolidated subsidiaries and $98.3 million of rabbi trust assets and miscellaneous investments.

^(b)  Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

For the three and six months ended June 30, 2017 and 2016 there were no Level 3 nuclear decommissioning fund investments and no transfers of amounts between levels.

The following table summarizes the final contractual maturity dates of the debt securities in the nuclear decommissioning fund, by asset class, at June 30, 2017:

	Final Contractual Maturity
(Thousands of Dollars)	Due in 1 Year or Less		Due in 1 to 5 Years		Due in 5 to 10 Years		Due after 10 Years		Total
Government securities	$	—	$	2,770	$	6,497	$	28,577	$	37,844
U.S. corporate bonds	2,824		44,843		78,518		16,145		142,330
Non U.S. corporate bonds	—		10,964		10,851		3,044		24,859
Debt securities	$	2,824	$	58,577	$	95,866	$	47,766	$	205,033

Rabbi Trusts

In June 2016, Xcel Energy established rabbi trusts to provide partial funding for future distributions of its supplemental executive retirement plan and deferred compensation plan. The following tables present the cost and fair value of the assets held in rabbi trusts at June 30, 2017 and Dec. 31, 2016:

	June 30, 2017
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	11,214	$	11,214	$	—	$	—	$	11,214
Mutual funds	46,171		47,380		—		—		47,380
Total	$	57,385	$	58,594	$	—	$	—	$	58,594

	Dec. 31, 2016
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	47,831	$	47,831	$	—	$	—	$	47,831
Mutual funds	1,663		1,901		—		—		1,901
Total	$	49,494	$	49,732	$	—	$	—	$	49,732

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

Derivative Instruments Fair Value Measurements

Xcel Energy enters into derivative instruments, including forward contracts, futures, swaps and options, for trading purposes and to manage risk in connection with changes in interest rates, utility commodity prices and vehicle fuel prices.

Interest Rate Derivatives — Xcel Energy enters into various instruments that effectively fix the interest payments on certain floating rate debt obligations or effectively fix the yield or price on a specified benchmark interest rate for an anticipated debt issuance for a specific period. These derivative instruments are generally designated as cash flow hedges for accounting purposes.

At June 30, 2017, accumulated other comprehensive losses related to interest rate derivatives included $3.0 million of net losses expected to be reclassified into earnings during the next 12 months as the related hedged interest rate transactions impact earnings, including forecasted amounts for unsettled hedges, as applicable.

Wholesale and Commodity Trading Risk — Xcel Energy Inc.’s utility subsidiaries conduct various wholesale and commodity trading activities, including the purchase and sale of electric capacity, energy, energy-related instruments and natural gas-related instruments, including derivatives. Xcel Energy’s risk management policy allows management to conduct these activities within guidelines and limitations as approved by its risk management committee, which is made up of management personnel not directly involved in the activities governed by this policy.

Commodity Derivatives — Xcel Energy enters into derivative instruments to manage variability of future cash flows from changes in commodity prices in its electric and natural gas operations, as well as for trading purposes. This could include the purchase or sale of energy or energy-related products, natural gas to generate electric energy, natural gas for resale, FTRs, vehicle fuel and weather derivatives.

At June 30, 2017, Xcel Energy had various vehicle fuel contracts designated as cash flow hedges extending through December 2018. Xcel Energy enters into derivative instruments that mitigate commodity price risk on behalf of electric and natural gas customers, but may not be designated as qualifying hedging transactions. Changes in the fair value of non-trading commodity derivative instruments are recorded in other comprehensive income or deferred as a regulatory asset or liability. The classification as a regulatory asset or liability is based on commission approved regulatory recovery mechanisms. Xcel Energy recorded immaterial amounts to income related to the ineffectiveness of cash flow hedges for the three and six months ended June 30, 2017 and 2016.

At June 30, 2017, net gains related to commodity derivative cash flow hedges recorded as a component of accumulated other comprehensive losses included immaterial amounts expected to be reclassified into earnings during the next 12 months as the hedged transactions occur.

Additionally, Xcel Energy enters into commodity derivative instruments for trading purposes not directly related to commodity price risks associated with serving its electric and natural gas customers. Changes in the fair value of these commodity derivatives are recorded in electric operating revenues, net of amounts credited to customers under margin-sharing mechanisms.

The following table details the gross notional amounts of commodity forwards, options and FTRs at June 30, 2017 and Dec. 31, 2016:

(Amounts in Thousands) (a)(b)	June 30, 2017	Dec. 31, 2016
Megawatt hours of electricity	101,225	46,773
Million British thermal units of natural gas	66,974	121,978
Gallons of vehicle fuel	360	—

^(a)  Amounts are not reflective of net positions in the underlying commodities.

^(b)  Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

The following tables detail the impact of derivative activity during the three and six months ended June 30, 2017 and 2016, on accumulated other comprehensive loss, regulatory assets and liabilities, and income:

	Three Months Ended June 30, 2017
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax (Gains) Losses Reclassified into Income During the Period from:								Pre-Tax Gains Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss				Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	1,319		(a)	$	—			$	—
Vehicle fuel and other commodity	43		—			(5		)	(b)	—				—
Total	$	43	$	—		$	1,314			$	—			$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—			$	—			$	5,785	(c)
Electric commodity	—		(1,299		)	—				(2,315		)	(d)	—
Natural gas commodity	—		(1,685		)	—				—				—
Total	$	—	$	(2,984	)	$	—			$	(2,315	)		$	5,785

	Six Months Ended June 30, 2017
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax (Gains) Losses Reclassified into Income During the Period from:								Pre-Tax Gains (Losses) Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss				Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	2,678		(a)	$	—			$	—
Vehicle fuel and other commodity	43		—			(5		)	(b)	—				—
Total	$	43	$	—		$	2,673			$	—			$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—			$	—			$	6,786		(c)
Electric commodity	—		(505		)	—				(6,313		)	(d)	—
Natural gas commodity	—		(7,846		)	—				1,075			(e)	(4,070		)	(e)
Total	$	—	$	(8,351	)	$	—			$	(5,238	)		$	2,716

	Three Months Ended June 30, 2016
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax Losses Reclassified into Income During the Period from:						Pre-Tax Gains Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	1,483	(a)	$	—		$	—
Vehicle fuel and other commodity	19		—			47		(b)	—			—
Total	$	19	$	—		$	1,530		$	—		$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—		$	—		$	481	(c)
Electric commodity	—		(705		)	—			16,642		(d)	—
Natural gas commodity	—		6,063			—			—			25		(e)
Total	$	—	$	5,358		$	—		$	16,642		$	506

	Six Months Ended June 30, 2016
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax Losses Reclassified into Income During the Period from:						Pre-Tax Gains (Losses) Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	2,968	(a)	$	—		$	—
Vehicle fuel and other commodity	13		—			104		(b)	—			—
Total	$	13	$	—		$	3,072		$	—		$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—		$	—		$	1,490		(c)
Electric commodity	—		(970		)	—			27,533		(d)	—
Natural gas commodity	—		3,361			—			11,666		(e)	(4,999		)	(e)
Total	$	—	$	2,391		$	—		$	39,199		$	(3,509	)

^(a)  Amounts are recorded to interest charges.

^(b)  Amounts are recorded to operating and maintenance (O&M) expenses.

^(c)  Amounts are recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

^(d)  Amounts are recorded to electric fuel and purchased power. These derivative settlement gain and loss amounts are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

^(e)  Certain derivatives are utilized to mitigate natural gas price risk for electric generation and are recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Amounts for the three and six months ended June 30, 2017 included no settlement gains or losses and $0.9 million of settlement gains, respectively. Amounts for the three and six months ended June 30, 2016 included an immaterial amount of settlement losses. The remaining derivative settlement gains and losses for the three and six months ended June 30, 2017 and 2016 relate to natural gas operations and are recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

Xcel Energy had no derivative instruments designated as fair value hedges during the three and six months ended June 30, 2017 and 2016. Therefore, no gains or losses from fair value hedges or related hedged transactions were recognized for these periods.

Consideration of Credit Risk and Concentrations — Xcel Energy continuously monitors the creditworthiness of the counterparties to its interest rate derivatives and commodity derivative contracts prior to settlement, and assesses each counterparty’s ability to perform on the transactions set forth in the contracts. Given this assessment, as well as an assessment of the impact of Xcel Energy’s own credit risk when determining the fair value of derivative liabilities, the impact of credit risk was immaterial to the fair value of unsettled commodity derivatives presented in the consolidated balance sheets.

Xcel Energy Inc. and its subsidiaries employ additional credit risk control mechanisms when appropriate, such as letters of credit, parental guarantees, standardized master netting agreements and termination provisions that allow for offsetting of positive and negative exposures. Credit exposure is monitored and, when necessary, the activity with a specific counterparty is limited until credit enhancement is provided.

Xcel Energy’s utility subsidiaries’ most significant concentrations of credit risk with particular entities or industries are contracts with counterparties to their wholesale, trading and non-trading commodity activities. At June 30, 2017, two of Xcel Energy’s 10 most significant counterparties for these activities, comprising $28.1 million or 12 percent of this credit exposure, had investment grade credit ratings from Standard & Poor’s, Moody’s or Fitch Ratings. Eight of the 10 most significant counterparties, comprising $75.7 million or 32 percent of this credit exposure, were not rated by these external agencies, but based on Xcel Energy’s internal analysis, had credit quality consistent with investment grade. All ten of these significant counterparties are municipal or cooperative electric entities or other utilities.

Credit Related Contingent Features—Contract provisions for derivative instruments that the utility subsidiaries enter, including those accounted for as normal purchase-normal sale contracts and therefore not reflected on the balance sheet, may require the posting of collateral or settlement of the contracts for various reasons, including if the applicable utility subsidiary is unable to maintain its credit ratings. At June 30, 2017 and Dec. 31, 2016, there were no derivative instruments in a liability position with underlying contract provisions that required the posting of collateral or settlement of applicable outstanding contracts if the credit ratings of Xcel Energy Inc.’s utility subsidiaries were downgraded below investment grade.

Certain derivative instruments are also subject to contract provisions that contain adequate assurance clauses. These provisions allow counterparties to seek performance assurance, including cash collateral, in the event that a given utility subsidiary’s ability to fulfill its contractual obligations is reasonably expected to be impaired. Xcel Energy had no collateral posted related to adequate assurance clauses in derivative contracts as of June 30, 2017 and Dec. 31, 2016.

Recurring Fair Value Measurements — The following table presents for each of the fair value hierarchy levels, Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis at June 30, 2017:

	June 30, 2017
	Fair Value						Fair Value Total		Counterparty Netting (b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	25	$	—	$	25	$	(25	)	$	—
Other derivative instruments:
Commodity trading	2,974		13,383		2		16,359		(8,958		)	7,401
Electric commodity	—		—		68,069		68,069		(4,048		)	64,021
Natural gas commodity	—		1,439		—		1,439		—			1,439
Total current derivative assets	$	2,974	$	14,847	$	68,071	$	85,892	$	(13,031	)	72,861
PPAs (a)												5,626
Current derivative instruments												$	78,487
Noncurrent derivative assets
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	14	$	—	$	14	$	—		$	14
Other derivative instruments:
Commodity trading	250		30,686		5,215		36,151		(7,307		)	28,844
Total noncurrent derivative assets	$	250	$	30,700	$	5,215	$	36,165	$	(7,307	)	28,858
PPAs (a)												21,552
Noncurrent derivative instruments												$	50,410

	June 30, 2017
	Fair Value						Fair Value Total		Counterparty Netting (b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	—	$	—	$	—	$	(25	)	$	(25	)
Other derivative instruments:
Commodity trading	3,050		11,443		1		14,494		(9,280		)	5,214
Electric commodity	—		—		4,048		4,048		(4,048		)	—
Total current derivative liabilities	$	3,050	$	11,443	$	4,049	$	18,542	$	(13,353	)	5,189
PPAs (a)												22,830
Current derivative instruments												$	28,019
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	98	$	22,861	$	—	$	22,959	$	(10,522	)	$	12,437
Total noncurrent derivative liabilities	$	98	$	22,861	$	—	$	22,959	$	(10,522	)	12,437
PPAs (a)												123,818
Noncurrent derivative instruments												$	136,255

^(a)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

^(b)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2017. At June 30, 2017, derivative assets and liabilities include no obligations to return cash collateral and the rights to reclaim cash collateral of $3.5 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

The following table presents for each of the fair value hierarchy levels, Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis at Dec. 31, 2016:

	Dec. 31, 2016
	Fair Value						Fair Value Total		Counterparty Netting(b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Other derivative instruments:
Commodity trading	$	13,179	$	14,105	$	—	$	27,284	$	(20,637	)	$	6,647
Electric commodity	—		—		19,251		19,251		(1,976		)	17,275
Natural gas commodity	—		8,839		—		8,839		—			8,839
Total current derivative assets	$	13,179	$	22,944	$	19,251	$	55,374	$	(22,613	)	32,761
PPAs (a)												5,463
Current derivative instruments												$	38,224
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	100	$	31,029	$	—	$	31,129	$	(7,323	)	$	23,806
Natural gas commodity	—		1,652		—		1,652		—			1,652
Total noncurrent derivative assets	$	100	$	32,681	$	—	$	32,781	$	(7,323	)	25,458
PPAs (a)												24,731
Noncurrent derivative instruments												$	50,189

	Dec. 31, 2016
	Fair Value						Fair Value Total		Counterparty Netting(b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Other derivative instruments:
Commodity trading	$	13,787	$	11,320	$	22	$	25,129	$	(20,974	)	$	4,155
Electric commodity	—		—		1,976		1,976		(1,976		)	—
Total current derivative liabilities	$	13,787	$	11,320	$	1,998	$	27,105	$	(22,950	)	4,155
PPAs (a)												22,804
Current derivative instruments												$	26,959
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	89	$	23,424	$	—	$	23,513	$	(10,727	)	$	12,786
Total noncurrent derivative liabilities	$	89	$	23,424	$	—	$	23,513	$	(10,727	)	12,786
PPAs (a)												135,360
Noncurrent derivative instruments												$	148,146

^(a)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

^(b)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2016. At Dec. 31, 2016, derivative assets and liabilities include no obligations to return cash collateral and rights to reclaim cash collateral of $3.7 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

The following table presents the changes in Level 3 commodity derivatives for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30
(Thousands of Dollars)	2017			2016
Balance at April 1	$	5,836		$	6,854
Purchases	76,281			29,826
Settlements	(22,272		)	(14,111		)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	6,016			(18		)
Net gains recognized as regulatory assets and liabilities	3,376			1,966
Balance at June 30	$	69,237		$	24,517
	Six Months Ended June 30
(Thousands of Dollars)	2017			2016
Balance at Jan. 1	$	17,253		$	18,028
Purchases	80,073			31,670
Settlements	(42,074		)	(26,161		)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	5,221			(43		)
Net gains recognized as regulatory assets and liabilities	8,764			1,023
Balance at June 30	$	69,237		$	24,517

^(a)  These amounts relate to commodity derivatives held at the end of the period.

Xcel Energy recognizes transfers between levels as of the beginning of each period. There were no transfers of amounts between levels for derivative instruments for the three and six months ended June 30, 2017 and 2016.

Fair Value of Long-Term Debt

As of June 30, 2017 and Dec. 31, 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:

	June 30, 2017				Dec. 31, 2016
(Thousands of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	14,597,178	$	15,879,594	$	14,450,247	$	15,513,209

The fair value of Xcel Energy’s long-term debt is estimated based on recent trades and observable spreads from benchmark interest rates for similar securities. The fair value estimates are based on information available to management as of June 30, 2017 and Dec. 31, 2016, and given the observability of the inputs to these estimates, the fair values presented for long-term debt have been assigned a Level 2.

XML

Other Income, Net

6 Months Ended

Jun. 30, 2017

Other Income and Expenses [Abstract]

Other Income, Net

Other Income, Net

Other income, net consisted of the following:

	Three Months Ended June 30						Six Months Ended June 30
(Thousands of Dollars)	2017			2016			2017			2016
Interest income	$	2,107		$	984		$	5,907		$	5,054
Other nonoperating income	1,523			1,496			5,168			2,176
Insurance policy expense	(1,022		)	(920		)	(2,021		)	(1,420		)
Other income, net	$	2,608		$	1,560		$	9,054		$	5,810

XML

Segment Information

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Segment Information

Segment Information

The regulated electric utility operating results of NSP-Minnesota, NSP-Wisconsin, PSCo and SPS, as well as the regulated natural gas utility operating results of NSP-Minnesota, NSP-Wisconsin and PSCo are each separately and regularly reviewed by Xcel Energy’s chief operating decision maker. Xcel Energy evaluates performance by each utility subsidiary based on profit or loss generated from the product or service provided. These segments are managed separately because the revenue streams are dependent upon regulated rate recovery, which is separately determined for each segment.

Xcel Energy has the following reportable segments: regulated electric utility, regulated natural gas utility and all other.

• Xcel Energy’s regulated electric utility segment generates, transmits and distributes electricity primarily in portions of Minnesota, Wisconsin, Michigan, North Dakota, South Dakota, Colorado, Texas and New Mexico. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. Regulated electric utility also includes commodity trading operations.

• Xcel Energy’s regulated natural gas utility segment transports, stores and distributes natural gas primarily in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado.

• Revenues from operating segments not included above are below the necessary quantitative thresholds and are therefore included in the all other category. Those primarily include steam revenue, appliance repair services, nonutility real estate activities, revenues associated with processing solid waste into refuse-derived fuel and investments in rental housing projects that qualify for low-income housing tax credits.

Xcel Energy had equity investments in unconsolidated subsidiaries of $133.2 million and $132.8 million as of June 30, 2017 and Dec. 31, 2016, respectively, included in the regulated natural gas utility segment.

Asset and capital expenditure information is not provided for Xcel Energy’s reportable segments because as an integrated electric and natural gas utility, Xcel Energy operates significant assets that are not dedicated to a specific business segment, and reporting assets and capital expenditures by business segment would require arbitrary and potentially misleading allocations which may not necessarily reflect the assets that would be required for the operation of the business segments on a stand-alone basis.

To report income from operations for regulated electric and regulated natural gas utility segments, the majority of costs are directly assigned to each segment. However, some costs, such as common depreciation, common O&M expenses and interest expense are allocated based on cost causation allocators. A general allocator is used for certain general and administrative expenses, including office supplies, rent, property insurance and general advertising.

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended June 30, 2017
Operating revenues from external customers	$	2,338,017	$	289,839	$	17,072		$	—		$	2,644,928
Intersegment revenues	433		285		—			(718		)	—
Total revenues	$	2,338,450	$	290,124	$	17,072		$	(718	)	$	2,644,928
Net income (loss)	$	227,562	$	13,166	$	(13,472	)	$	—		$	227,256

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended June 30, 2016
Operating revenues from external customers	$	2,224,142	$	258,899	$	16,808		$	—		$	2,499,849
Intersegment revenues	421		241		—			(662		)	—
Total revenues	$	2,224,563	$	259,140	$	16,808		$	(662	)	$	2,499,849
Net income (loss)	$	205,440	$	11,933	$	(20,578	)	$	—		$	196,795

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Six Months Ended June 30, 2017
Operating revenues from external customers	$	4,637,077	$	915,542	$	38,731		$	—		$	5,591,350
Intersegment revenues	730		549		—			(1,279		)	—
Total revenues	$	4,637,807	$	916,091	$	38,731		$	(1,279	)	$	5,591,350
Net income (loss)	$	421,715	$	76,093	$	(31,275	)	$	—		$	466,533

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Six Months Ended June 30, 2016
Operating revenues from external customers	$	4,409,261	$	824,588	$	38,273		$	—		$	5,272,122
Intersegment revenues	756		528		—			(1,284		)	—
Total revenues	$	4,410,017	$	825,116	$	38,273		$	(1,284	)	$	5,272,122
Net income (loss)	$	383,677	$	90,271	$	(35,841	)	$	—		$	438,107

XML

Earnings Per Share

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Basic earnings per share (EPS) was computed by dividing the earnings available to Xcel Energy Inc.’s common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS was computed by dividing the earnings available to Xcel Energy Inc.’s common shareholders by the diluted weighted average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other agreements to issue common stock (i.e., common stock equivalents) were settled. The weighted average number of potentially dilutive shares outstanding used to calculate Xcel Energy Inc.’s diluted EPS is calculated using the treasury stock method.

Common Stock Equivalents— Xcel Energy Inc. currently has common stock equivalents related to certain equity awards in share-based compensation arrangements.

Common stock equivalents causing dilutive impact to EPS include commitments to issue common stock related to time based equity compensation awards.

Stock equivalent units granted to Xcel Energy Inc.’s Board of Directors are included in common shares outstanding upon grant date as there is no further service, performance or market condition associated with these awards. Restricted stock, granted to settle amounts due to certain employees under the Xcel Energy Inc. Executive Annual Incentive Award Plan, is included in common shares outstanding when granted.

Share-based compensation arrangements for which there is currently no dilutive impact to EPS include the following:

• Equity awards subject to a performance condition; included in common shares outstanding when all necessary conditions for settlement have been satisfied by the end of the reporting period.

• Liability awards subject to a performance condition; any portions settled in shares are included in common shares outstanding upon settlement.

The dilutive impact of common stock equivalents affecting EPS was as follows:

	Three Months Ended June 30, 2017					Three Months Ended June 30, 2016
(Amounts in thousands, except per share data)	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Net income	$	227,256	—	—		$	196,795	—	—
Basic EPS:
Earnings available to common shareholders	227,256		508,542	$	0.45	196,795		508,930	$	0.39
Effect of dilutive securities:
Time based equity awards	—		593	—		—		560	—
Diluted EPS:
Earnings available to common shareholders	$	227,256	509,135	$	0.45	$	196,795	509,490	$	0.39

	Six Months Ended June 30, 2017					Six Months Ended June 30, 2016
(Amounts in thousands, except per share data)	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Net income	$	466,533	—	—		$	438,107	—	—
Basic EPS:
Earnings available to common shareholders	466,533		508,411	$	0.92	438,107		508,789	$	0.86
Effect of dilutive securities:
Time based equity awards	—		544	—		—		522	—
Diluted EPS:
Earnings available to common shareholders	$	466,533	508,955	$	0.92	$	438,107	509,311	$	0.86

XML

Benefit Plans and Other Postretirement Benefits

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Benefit Plans and Other Postretirement Benefits

Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended June 30
	2017			2016			2017			2016
(Thousands of Dollars)	Pension Benefits						Postretirement Health Care Benefits
Service cost	$	23,547		$	22,945		$	465		$	431
Interest cost	36,702			40,028			5,984			6,526
Expected return on plan assets	(52,318		)	(52,575		)	(6,155		)	(6,248		)
Amortization of prior service credit	(442		)	(477		)	(2,672		)	(2,671		)
Amortization of net loss	26,671			24,385			1,672			1,009
Net periodic benefit cost (credit)	34,160			34,306			(706		)	(953		)
Costs not recognized due to the effects of regulation	(3,899		)	(4,159		)	—			—
Net benefit cost (credit) recognized for financial reporting	$	30,261		$	30,147		$	(706	)	$	(953	)

	Six Months Ended June 30
	2017			2016			2017			2016
(Thousands of Dollars)	Pension Benefits						Postretirement Health Care Benefits
Service cost	$	47,094		$	45,865		$	930		$	863
Interest cost	73,404			80,051			11,968			13,053
Expected return on plan assets	(104,635		)	(105,150		)	(12,311		)	(12,497		)
Amortization of prior service credit	(884		)	(961		)	(5,343		)	(5,343		)
Amortization of net loss	53,341			48,770			3,344			2,020
Net periodic benefit cost (credit)	68,320			68,575			(1,412		)	(1,904		)
Costs not recognized due to the effects of regulation	(7,914		)	(8,611		)	—			—
Net benefit cost (credit) recognized for financial reporting	$	60,406		$	59,964		$	(1,412	)	$	(1,904	)

In January 2017, contributions of $150.0 million were made across four of Xcel Energy’s pension plans. Xcel Energy does not expect additional pension contributions during 2017.

XML

Other Comprehensive Income

6 Months Ended

Jun. 30, 2017

Stockholders' Equity Note [Abstract]

Other Comprehensive Income

Other Comprehensive Income

Changes in accumulated other comprehensive (loss) income, net of tax, for the three and six months ended June 30, 2017 and 2016 were as follows:

	Three Months Ended June 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains and Losses onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at April 1	$	(50,326	)	$	110	$	(58,365	)	$	(108,581	)
Other comprehensive income before reclassifications	26			1		—			27
Losses reclassified from net accumulated other comprehensive loss	803			—		956			1,759
Net current period other comprehensive income	829			1		956			1,786
Accumulated other comprehensive (loss) income at June 30	$	(49,497	)	$	111	$	(57,409	)	$	(106,795	)

	Three Months Ended June 30, 2016
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains and Losses onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at April 1	$	(53,928	)	$	110	$	(54,790	)	$	(108,608	)
Other comprehensive income before reclassifications	12			—		—			12
Losses reclassified from net accumulated other comprehensive loss	936			—		865			1,801
Net current period other comprehensive income	948			—		865			1,813
Accumulated other comprehensive (loss) income at June 30	$	(52,980	)	$	110	$	(53,925	)	$	(106,795	)

	Six Months Ended June 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at Jan. 1	$	(51,151	)	$	110	$	(59,313	)	$	(110,354	)
Other comprehensive income before reclassifications	26			1		—			27
Losses reclassified from net accumulated other comprehensive loss	1,628			—		1,904			3,532
Net current period other comprehensive income	1,654			1		1,904			3,559
Accumulated other comprehensive (loss) income at June 30	$	(49,497	)	$	111	$	(57,409	)	$	(106,795	)

	Six Months Ended June 30, 2016
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at Jan. 1	$	(54,862	)	$	110	$	(55,001	)	$	(109,753	)
Other comprehensive income (loss) before reclassifications	8			—		(653		)	(645		)
Losses reclassified from net accumulated other comprehensive loss	1,874			—		1,729			3,603
Net current period other comprehensive income	1,882			—		1,076			2,958
Accumulated other comprehensive (loss) income at June 30	$	(52,980	)	$	110	$	(53,925	)	$	(106,795	)

Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2017 and 2016 were as follows:

(Thousands of Dollars)	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
	Three Months Ended June 30, 2017				Three Months Ended June 30, 2016
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	1,319		(a)	$	1,483		(a)
Vehicle fuel derivatives	(5		)	(b)	47			(b)
Total, pre-tax	1,314				1,530
Tax benefit	(511		)		(594		)
Total, net of tax	803				936
Defined benefit pension and postretirement losses:
Amortization of net loss	1,621			(c)	1,478			(c)
Prior service credit	(57		)	(c)	(64		)	(c)
Total, pre-tax	1,564				1,414
Tax benefit	(608		)		(549		)
Total, net of tax	956				865
Total amounts reclassified, net of tax	$	1,759			$	1,801

	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
(Thousands of Dollars)	Six Months Ended June 30, 2017				Six Months Ended June 30, 2016
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	2,678		(a)	$	2,968		(a)
Vehicle fuel derivatives	(5		)	(b)	104			(b)
Total, pre-tax	2,673				3,072
Tax benefit	(1,045		)		(1,198		)
Total, net of tax	1,628				1,874
Defined benefit pension and postretirement losses:
Amortization of net loss	3,244			(c)	2,956			(c)
Prior service credit	(117		)	(c)	(128		)	(c)
Total, pre-tax	3,127				2,828
Tax benefit	(1,223		)		(1,099		)
Total, net of tax	1,904				1,729
Total amounts reclassified, net of tax	$	3,532			$	3,603

^(a)  Included in interest charges.

^(b)  Included in O&M expenses.

^(c)  Included in the computation of net periodic pension and postretirement benefit costs. See Note 12 for details regarding these benefit plans.

XML

Selected Balance Sheet Data (Tables)

6 Months Ended

Jun. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

(Thousands of Dollars)	June 30, 2017			Dec. 31, 2016
Accounts receivable, net
Accounts receivable	$	808,705		$	827,112
Less allowance for bad debts	(49,327		)	(50,823		)
	$	759,378		$	776,289

Inventories

(Thousands of Dollars)	June 30, 2017		Dec. 31, 2016
Inventories
Materials and supplies	$	321,426	$	312,430
Fuel	156,736		181,752
Natural gas	63,882		110,044
	$	542,044	$	604,226

Property, Plant and Equipment, Net

(Thousands of Dollars)	June 30, 2017			Dec. 31, 2016
Property, plant and equipment, net
Electric plant	$	38,810,158		$	38,220,765
Natural gas plant	5,465,224			5,317,717
Common and other property	1,959,703			1,888,518
Plant to be retired (a)	17,820			31,839
Construction work in progress	1,571,362			1,373,380
Total property, plant and equipment	47,824,267			46,832,219
Less accumulated depreciation	(14,703,391		)	(14,381,603		)
Nuclear fuel	2,660,606			2,571,770
Less accumulated amortization	(2,237,639		)	(2,180,636		)
	$	33,543,843		$	32,841,750

^(a)  In the second half of 2017, PSCo expects to both early retire Valmont Unit 5 and convert Cherokee Unit 4 from a coal-fueled generating facility to natural gas. PSCo also expects Craig Unit 1 to be early retired in approximately 2025. Amounts are presented net of accumulated depreciation.

XML

Income Taxes (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Earliest Open Tax Years Subject to Examination by State Taxing Authorities in the Major Operating Jurisdictions

State Audits—Xcel Energy files consolidated state tax returns based on income in its major operating jurisdictions of Colorado, Minnesota, Texas, and Wisconsin, and various other state income-based tax returns. As of June 30, 2017, Xcel Energy’s earliest open tax years that are subject to examination by state taxing authorities in its major operating jurisdictions were as follows:

State	Year
Colorado	2009
Minnesota	2009
Texas	2009
Wisconsin	2012

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the amount of unrecognized tax benefit is as follows:

(Millions of Dollars)	June 30, 2017		Dec. 31, 2016
Unrecognized tax benefit — Permanent tax positions	$	30.8	$	29.6
Unrecognized tax benefit — Temporary tax positions	106.6		104.1
Total unrecognized tax benefit	$	137.4	$	133.7

Tax Benefits Associated with NOL and Tax Credit Carryforwards

The unrecognized tax benefit amounts were reduced by the tax benefits associated with NOL and tax credit carryforwards. The amounts of tax benefits associated with NOL and tax credit carryforwards are as follows:

(Millions of Dollars)	June 30, 2017			Dec. 31, 2016
NOL and tax credit carryforwards	$	(47.4	)	$	(43.8	)

Interest Payable related to Unrecognized Tax Benefits [Table Text Block]

The payable for interest related to unrecognized tax benefits is partially offset by the interest benefit associated with NOL and tax credit carryforwards. A reconciliation of the beginning and ending amount of the payable for interest related to unrecognized tax benefits are as follows:

(Millions of Dollars)	June 30, 2017			Dec. 31, 2016
Payable for interest related to unrecognized tax benefits at beginning of period	$	(3.4	)	$	(0.1	)
Interest expense related to unrecognized tax benefits recorded during the period	(1.7		)	(3.3		)
Payable for interest related to unrecognized tax benefits at end of period	$	(5.1	)	$	(3.4	)

XML

Rate Matters (Tables)

6 Months Ended

Jun. 30, 2017

Public Utilities, General Disclosures [Abstract]

NSP-Minnesota 2016 Rate Case Final Order

(Millions of Dollars, incremental)	2016		2017		2018		2019			Total
Revenues	$	74.99	$	59.86	$	—	$	50.12		$	184.97
NSP-Minnesota’s sales true-up	59.95		—		—		(0.20		)	59.75
Total rate impact	$	134.94	$	59.86	$	—	$	49.92		$	244.72

Colorado 2018 Multi-Year Gas Rate Case [Table Text Block]

Revenue Request (Millions of Dollars)	2018		2019		2020		Total
New revenue request	$	63.2	$	32.9	$	42.9	$	139.0
Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates (a)	—		93.9		—		93.9
Total	$	63.2	$	126.8	$	42.9	$	232.9
Expected Year-End Rate Base (Billions of dollars) (b)	$	1.5	$	2.3	$	2.4	N/A

^(a) The roll-in of PSIA rider revenue into base rates will not have an impact on customer bills or total revenue as these costs are already being recovered from customers through the rider. PSCo plans to request new PSIA rates for 2018 in November 2017. The recovery of new, incremental PSIA related investments in 2019 and 2020 are included in the base rate request.

^(b) The additional rate base in 2019 predominantly reflects the roll-in of capital associated with the PSIA rider.

XML

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Guarantees and Bond Indemnities Issued and Outstanding

The following table presents guarantees and bond indemnities issued and outstanding for Xcel Energy:

(Millions of Dollars)	June 30, 2017		Dec. 31, 2016
Guarantees issued and outstanding	$	18.3	$	18.8
Current exposure under these guarantees	—		0.1
Bonds with indemnity protection	49.4		43.0

XML

Borrowings and Other Financing Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Commercial Paper

Commercial paper outstanding for Xcel Energy was as follows:

(Amounts in Millions, Except Interest Rates)	Three Months Ended    June 30, 2017			Year Ended    Dec. 31, 2016
Borrowing limit	$	2,750		$	2,750
Amount outstanding at period end	784			392
Average amount outstanding	778			485
Maximum amount outstanding	1,247			1,183
Weighted average interest rate, computed on a daily basis	1.28		%	0.74		%
Weighted average interest rate at period end	1.49			0.95

Credit Facilities

At June 30, 2017, Xcel Energy Inc. and its utility subsidiaries had the following committed credit facilities available:

(Millions of Dollars)	Credit Facility (a)		Drawn (b)		Available
Xcel Energy Inc.	$	1,000	$	549	$	451
PSCo	700		3		697
NSP-Minnesota	500		91		409
SPS	400		109		291
NSP-Wisconsin	150		46		104
Total	$	2,750	$	798	$	1,952

^(a)  These credit facilities expire in June 2021.

^(b)  Includes outstanding commercial paper and letters of credit.

XML

Fair Value of Financial Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Cost and Fair Value of Nuclear Decommissioning Fund Investments

The following tables present the cost and fair value of Xcel Energy’s non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund at June 30, 2017 and Dec. 31, 2016:

	June 30, 2017
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Investments Measured at NAV (b)		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	10,990	$	10,990	$	—	$	—	$	—	$	10,990
Commingled funds:
Non U.S. equities	280,608		191,881		—		—		106,085		297,966
Emerging market debt funds	96,008		—		—		—		103,736		103,736
Commodity funds	106,571		—		—		—		82,897		82,897
Private equity investments	138,889		—		—		—		195,491		195,491
Real estate	131,270		—		—		—		195,515		195,515
Other commingled funds	131,243		—		—		—		141,918		141,918
Debt securities:
Government securities	38,319		—		37,844		—		—		37,844
U.S. corporate bonds	141,510		—		142,330		—		—		142,330
Non U.S. corporate bonds	24,386		—		24,859		—		—		24,859
Equity securities:
U.S. equities	287,425		526,581		—		—		—		526,581
Non U.S. equities	171,695		226,868		—		—		—		226,868
Total	$	1,558,914	$	956,320	$	205,033	$	—	$	825,642	$	1,986,995

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $133.2 million of equity investments in unconsolidated subsidiaries and $111.4 million of rabbi trust assets and miscellaneous investments.

^(b)  Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

	Dec. 31, 2016
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Investments Measured at NAV (b)		Total
Nuclear decommissioning fund (a)
Cash equivalents	$	20,379	$	20,379	$	—	$	—	$	—	$	20,379
Commingled funds:
Non U.S. equities	260,877		133,126		—		—		112,233		245,359
Emerging market debt funds	93,597		—		—		—		97,543		97,543
Commodity funds	106,571		—		—		—		92,091		92,091
Private equity investments	132,190		—		—		—		190,462		190,462
Real estate	128,630		—		—		—		187,647		187,647
Other commingled funds	151,048		—		—		—		159,489		159,489
Debt securities:
Government securities	32,764		—		31,965		—		—		31,965
U.S. corporate bonds	104,913		—		105,772		—		—		105,772
Non U.S. corporate bonds	21,751		—		21,672		—		—		21,672
Municipal bonds	13,609		—		13,786		—		—		13,786
Mortgage-backed securities	2,785		—		2,816		—		—		2,816
Equity securities:
U.S. equities	270,779		473,400		—		—		—		473,400
Non U.S. equities	189,100		218,381		—		—		—		218,381
Total	$	1,528,993	$	845,286	$	176,011	$	—	$	839,465	$	1,860,762

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $132.8 million of equity investments in unconsolidated subsidiaries and $98.3 million of rabbi trust assets and miscellaneous investments.

^(b)  Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

Final Contractual Maturity Dates of Debt Securities in the Nuclear Decommissioning Fund by Asset Class

The following table summarizes the final contractual maturity dates of the debt securities in the nuclear decommissioning fund, by asset class, at June 30, 2017:

	Final Contractual Maturity
(Thousands of Dollars)	Due in 1 Year or Less		Due in 1 to 5 Years		Due in 5 to 10 Years		Due after 10 Years		Total
Government securities	$	—	$	2,770	$	6,497	$	28,577	$	37,844
U.S. corporate bonds	2,824		44,843		78,518		16,145		142,330
Non U.S. corporate bonds	—		10,964		10,851		3,044		24,859
Debt securities	$	2,824	$	58,577	$	95,866	$	47,766	$	205,033

Rabbi Trust Securities Amortized Cost and Fair Value Measured on Recurrring Basis [Table Text Block]

In June 2016, Xcel Energy established rabbi trusts to provide partial funding for future distributions of its supplemental executive retirement plan and deferred compensation plan. The following tables present the cost and fair value of the assets held in rabbi trusts at June 30, 2017 and Dec. 31, 2016:

	June 30, 2017
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	11,214	$	11,214	$	—	$	—	$	11,214
Mutual funds	46,171		47,380		—		—		47,380
Total	$	57,385	$	58,594	$	—	$	—	$	58,594

	Dec. 31, 2016
			Fair Value
(Thousands of Dollars)	Cost		Level 1		Level 2		Level 3		Total
Rabbi Trusts (a)
Cash equivalents	$	47,831	$	47,831	$	—	$	—	$	47,831
Mutual funds	1,663		1,901		—		—		1,901
Total	$	49,494	$	49,732	$	—	$	—	$	49,732

^(a)  Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

Gross Notional Amounts of Commodity Forwards, Options, and FTRs

The following table details the gross notional amounts of commodity forwards, options and FTRs at June 30, 2017 and Dec. 31, 2016:

(Amounts in Thousands) (a)(b)	June 30, 2017	Dec. 31, 2016
Megawatt hours of electricity	101,225	46,773
Million British thermal units of natural gas	66,974	121,978
Gallons of vehicle fuel	360	—

^(a)  Amounts are not reflective of net positions in the underlying commodities.

^(b)  Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income

The following tables detail the impact of derivative activity during the three and six months ended June 30, 2017 and 2016, on accumulated other comprehensive loss, regulatory assets and liabilities, and income:

	Three Months Ended June 30, 2017
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax (Gains) Losses Reclassified into Income During the Period from:								Pre-Tax Gains Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss				Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	1,319		(a)	$	—			$	—
Vehicle fuel and other commodity	43		—			(5		)	(b)	—				—
Total	$	43	$	—		$	1,314			$	—			$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—			$	—			$	5,785	(c)
Electric commodity	—		(1,299		)	—				(2,315		)	(d)	—
Natural gas commodity	—		(1,685		)	—				—				—
Total	$	—	$	(2,984	)	$	—			$	(2,315	)		$	5,785

	Six Months Ended June 30, 2017
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax (Gains) Losses Reclassified into Income During the Period from:								Pre-Tax Gains (Losses) Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss				Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	2,678		(a)	$	—			$	—
Vehicle fuel and other commodity	43		—			(5		)	(b)	—				—
Total	$	43	$	—		$	2,673			$	—			$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—			$	—			$	6,786		(c)
Electric commodity	—		(505		)	—				(6,313		)	(d)	—
Natural gas commodity	—		(7,846		)	—				1,075			(e)	(4,070		)	(e)
Total	$	—	$	(8,351	)	$	—			$	(5,238	)		$	2,716

	Three Months Ended June 30, 2016
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax Losses Reclassified into Income During the Period from:						Pre-Tax Gains Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	1,483	(a)	$	—		$	—
Vehicle fuel and other commodity	19		—			47		(b)	—			—
Total	$	19	$	—		$	1,530		$	—		$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—		$	—		$	481	(c)
Electric commodity	—		(705		)	—			16,642		(d)	—
Natural gas commodity	—		6,063			—			—			25		(e)
Total	$	—	$	5,358		$	—		$	16,642		$	506

	Six Months Ended June 30, 2016
	Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:					Pre-Tax Losses Reclassified into Income During the Period from:						Pre-Tax Gains (Losses) Recognized During the Period in Income
(Thousands of Dollars)	Accumulated Other Comprehensive Loss		Regulatory (Assets) and Liabilities			Accumulated Other Comprehensive Loss			Regulatory Assets and (Liabilities)
Derivatives designated as cash flow hedges
Interest rate	$	—	$	—		$	2,968	(a)	$	—		$	—
Vehicle fuel and other commodity	13		—			104		(b)	—			—
Total	$	13	$	—		$	3,072		$	—		$	—
Other derivative instruments
Commodity trading	$	—	$	—		$	—		$	—		$	1,490		(c)
Electric commodity	—		(970		)	—			27,533		(d)	—
Natural gas commodity	—		3,361			—			11,666		(e)	(4,999		)	(e)
Total	$	—	$	2,391		$	—		$	39,199		$	(3,509	)

^(a)  Amounts are recorded to interest charges.

^(b)  Amounts are recorded to operating and maintenance (O&M) expenses.

^(c)  Amounts are recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

^(d)  Amounts are recorded to electric fuel and purchased power. These derivative settlement gain and loss amounts are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

^(e)  Certain derivatives are utilized to mitigate natural gas price risk for electric generation and are recorded to electric fuel and purchased power, subject to cost-recovery mechanisms and reclassified to a regulatory asset, as appropriate. Amounts for the three and six months ended June 30, 2017 included no settlement gains or losses and $0.9 million of settlement gains, respectively. Amounts for the three and six months ended June 30, 2016 included an immaterial amount of settlement losses. The remaining derivative settlement gains and losses for the three and six months ended June 30, 2017 and 2016 relate to natural gas operations and are recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis by Hierarchy Level

Recurring Fair Value Measurements — The following table presents for each of the fair value hierarchy levels, Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis at June 30, 2017:

	June 30, 2017
	Fair Value						Fair Value Total		Counterparty Netting (b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	25	$	—	$	25	$	(25	)	$	—
Other derivative instruments:
Commodity trading	2,974		13,383		2		16,359		(8,958		)	7,401
Electric commodity	—		—		68,069		68,069		(4,048		)	64,021
Natural gas commodity	—		1,439		—		1,439		—			1,439
Total current derivative assets	$	2,974	$	14,847	$	68,071	$	85,892	$	(13,031	)	72,861
PPAs (a)												5,626
Current derivative instruments												$	78,487
Noncurrent derivative assets
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	14	$	—	$	14	$	—		$	14
Other derivative instruments:
Commodity trading	250		30,686		5,215		36,151		(7,307		)	28,844
Total noncurrent derivative assets	$	250	$	30,700	$	5,215	$	36,165	$	(7,307	)	28,858
PPAs (a)												21,552
Noncurrent derivative instruments												$	50,410

	June 30, 2017
	Fair Value						Fair Value Total		Counterparty Netting (b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Derivatives designated as cash flow hedges:
Vehicle fuel and other commodity	$	—	$	—	$	—	$	—	$	(25	)	$	(25	)
Other derivative instruments:
Commodity trading	3,050		11,443		1		14,494		(9,280		)	5,214
Electric commodity	—		—		4,048		4,048		(4,048		)	—
Total current derivative liabilities	$	3,050	$	11,443	$	4,049	$	18,542	$	(13,353	)	5,189
PPAs (a)												22,830
Current derivative instruments												$	28,019
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	98	$	22,861	$	—	$	22,959	$	(10,522	)	$	12,437
Total noncurrent derivative liabilities	$	98	$	22,861	$	—	$	22,959	$	(10,522	)	12,437
PPAs (a)												123,818
Noncurrent derivative instruments												$	136,255

^(a)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

^(b)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2017. At June 30, 2017, derivative assets and liabilities include no obligations to return cash collateral and the rights to reclaim cash collateral of $3.5 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

The following table presents for each of the fair value hierarchy levels, Xcel Energy’s derivative assets and liabilities measured at fair value on a recurring basis at Dec. 31, 2016:

	Dec. 31, 2016
	Fair Value						Fair Value Total		Counterparty Netting(b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative assets
Other derivative instruments:
Commodity trading	$	13,179	$	14,105	$	—	$	27,284	$	(20,637	)	$	6,647
Electric commodity	—		—		19,251		19,251		(1,976		)	17,275
Natural gas commodity	—		8,839		—		8,839		—			8,839
Total current derivative assets	$	13,179	$	22,944	$	19,251	$	55,374	$	(22,613	)	32,761
PPAs (a)												5,463
Current derivative instruments												$	38,224
Noncurrent derivative assets
Other derivative instruments:
Commodity trading	$	100	$	31,029	$	—	$	31,129	$	(7,323	)	$	23,806
Natural gas commodity	—		1,652		—		1,652		—			1,652
Total noncurrent derivative assets	$	100	$	32,681	$	—	$	32,781	$	(7,323	)	25,458
PPAs (a)												24,731
Noncurrent derivative instruments												$	50,189

	Dec. 31, 2016
	Fair Value						Fair Value Total		Counterparty Netting(b)			Total
(Thousands of Dollars)	Level 1		Level 2		Level 3
Current derivative liabilities
Other derivative instruments:
Commodity trading	$	13,787	$	11,320	$	22	$	25,129	$	(20,974	)	$	4,155
Electric commodity	—		—		1,976		1,976		(1,976		)	—
Total current derivative liabilities	$	13,787	$	11,320	$	1,998	$	27,105	$	(22,950	)	4,155
PPAs (a)												22,804
Current derivative instruments												$	26,959
Noncurrent derivative liabilities
Other derivative instruments:
Commodity trading	$	89	$	23,424	$	—	$	23,513	$	(10,727	)	$	12,786
Total noncurrent derivative liabilities	$	89	$	23,424	$	—	$	23,513	$	(10,727	)	12,786
PPAs (a)												135,360
Noncurrent derivative instruments												$	148,146

^(a)  During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

^(b)  Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2016. At Dec. 31, 2016, derivative assets and liabilities include no obligations to return cash collateral and rights to reclaim cash collateral of $3.7 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

Changes in Level 3 Commodity Derivatives

The following table presents the changes in Level 3 commodity derivatives for the three and six months ended June 30, 2017 and 2016:

	Three Months Ended June 30
(Thousands of Dollars)	2017			2016
Balance at April 1	$	5,836		$	6,854
Purchases	76,281			29,826
Settlements	(22,272		)	(14,111		)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	6,016			(18		)
Net gains recognized as regulatory assets and liabilities	3,376			1,966
Balance at June 30	$	69,237		$	24,517
	Six Months Ended June 30
(Thousands of Dollars)	2017			2016
Balance at Jan. 1	$	17,253		$	18,028
Purchases	80,073			31,670
Settlements	(42,074		)	(26,161		)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (a)	5,221			(43		)
Net gains recognized as regulatory assets and liabilities	8,764			1,023
Balance at June 30	$	69,237		$	24,517

^(a)  These amounts relate to commodity derivatives held at the end of the period.

Carrying Amount and Fair Value of Long-term Debt

As of June 30, 2017 and Dec. 31, 2016, other financial instruments for which the carrying amount did not equal fair value were as follows:

	June 30, 2017				Dec. 31, 2016
(Thousands of Dollars)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-term debt, including current portion	$	14,597,178	$	15,879,594	$	14,450,247	$	15,513,209

XML

Other Income, Net (Tables)

6 Months Ended

Jun. 30, 2017

Other Income and Expenses [Abstract]

Other Income, Net

Other income, net consisted of the following:

	Three Months Ended June 30						Six Months Ended June 30
(Thousands of Dollars)	2017			2016			2017			2016
Interest income	$	2,107		$	984		$	5,907		$	5,054
Other nonoperating income	1,523			1,496			5,168			2,176
Insurance policy expense	(1,022		)	(920		)	(2,021		)	(1,420		)
Other income, net	$	2,608		$	1,560		$	9,054		$	5,810

XML

Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended June 30, 2017
Operating revenues from external customers	$	2,338,017	$	289,839	$	17,072		$	—		$	2,644,928
Intersegment revenues	433		285		—			(718		)	—
Total revenues	$	2,338,450	$	290,124	$	17,072		$	(718	)	$	2,644,928
Net income (loss)	$	227,562	$	13,166	$	(13,472	)	$	—		$	227,256

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Three Months Ended June 30, 2016
Operating revenues from external customers	$	2,224,142	$	258,899	$	16,808		$	—		$	2,499,849
Intersegment revenues	421		241		—			(662		)	—
Total revenues	$	2,224,563	$	259,140	$	16,808		$	(662	)	$	2,499,849
Net income (loss)	$	205,440	$	11,933	$	(20,578	)	$	—		$	196,795

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Six Months Ended June 30, 2017
Operating revenues from external customers	$	4,637,077	$	915,542	$	38,731		$	—		$	5,591,350
Intersegment revenues	730		549		—			(1,279		)	—
Total revenues	$	4,637,807	$	916,091	$	38,731		$	(1,279	)	$	5,591,350
Net income (loss)	$	421,715	$	76,093	$	(31,275	)	$	—		$	466,533

(Thousands of Dollars)	Regulated Electric		Regulated Natural Gas		All Other			Reconciling Eliminations			Consolidated Total
Six Months Ended June 30, 2016
Operating revenues from external customers	$	4,409,261	$	824,588	$	38,273		$	—		$	5,272,122
Intersegment revenues	756		528		—			(1,284		)	—
Total revenues	$	4,410,017	$	825,116	$	38,273		$	(1,284	)	$	5,272,122
Net income (loss)	$	383,677	$	90,271	$	(35,841	)	$	—		$	438,107

XML

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Dilutive Impact of Common Stock Equivalents

The dilutive impact of common stock equivalents affecting EPS was as follows:

	Three Months Ended June 30, 2017					Three Months Ended June 30, 2016
(Amounts in thousands, except per share data)	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Net income	$	227,256	—	—		$	196,795	—	—
Basic EPS:
Earnings available to common shareholders	227,256		508,542	$	0.45	196,795		508,930	$	0.39
Effect of dilutive securities:
Time based equity awards	—		593	—		—		560	—
Diluted EPS:
Earnings available to common shareholders	$	227,256	509,135	$	0.45	$	196,795	509,490	$	0.39

	Six Months Ended June 30, 2017					Six Months Ended June 30, 2016
(Amounts in thousands, except per share data)	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Net income	$	466,533	—	—		$	438,107	—	—
Basic EPS:
Earnings available to common shareholders	466,533		508,411	$	0.92	438,107		508,789	$	0.86
Effect of dilutive securities:
Time based equity awards	—		544	—		—		522	—
Diluted EPS:
Earnings available to common shareholders	$	466,533	508,955	$	0.92	$	438,107	509,311	$	0.86

XML

Benefit Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost (Credit)

Components of Net Periodic Benefit Cost (Credit)

	Three Months Ended June 30
	2017			2016			2017			2016
(Thousands of Dollars)	Pension Benefits						Postretirement Health Care Benefits
Service cost	$	23,547		$	22,945		$	465		$	431
Interest cost	36,702			40,028			5,984			6,526
Expected return on plan assets	(52,318		)	(52,575		)	(6,155		)	(6,248		)
Amortization of prior service credit	(442		)	(477		)	(2,672		)	(2,671		)
Amortization of net loss	26,671			24,385			1,672			1,009
Net periodic benefit cost (credit)	34,160			34,306			(706		)	(953		)
Costs not recognized due to the effects of regulation	(3,899		)	(4,159		)	—			—
Net benefit cost (credit) recognized for financial reporting	$	30,261		$	30,147		$	(706	)	$	(953	)

	Six Months Ended June 30
	2017			2016			2017			2016
(Thousands of Dollars)	Pension Benefits						Postretirement Health Care Benefits
Service cost	$	47,094		$	45,865		$	930		$	863
Interest cost	73,404			80,051			11,968			13,053
Expected return on plan assets	(104,635		)	(105,150		)	(12,311		)	(12,497		)
Amortization of prior service credit	(884		)	(961		)	(5,343		)	(5,343		)
Amortization of net loss	53,341			48,770			3,344			2,020
Net periodic benefit cost (credit)	68,320			68,575			(1,412		)	(1,904		)
Costs not recognized due to the effects of regulation	(7,914		)	(8,611		)	—			—
Net benefit cost (credit) recognized for financial reporting	$	60,406		$	59,964		$	(1,412	)	$	(1,904	)

XML

Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2017

Stockholders' Equity Note [Abstract]

Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax

Changes in accumulated other comprehensive (loss) income, net of tax, for the three and six months ended June 30, 2017 and 2016 were as follows:

	Three Months Ended June 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains and Losses onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at April 1	$	(50,326	)	$	110	$	(58,365	)	$	(108,581	)
Other comprehensive income before reclassifications	26			1		—			27
Losses reclassified from net accumulated other comprehensive loss	803			—		956			1,759
Net current period other comprehensive income	829			1		956			1,786
Accumulated other comprehensive (loss) income at June 30	$	(49,497	)	$	111	$	(57,409	)	$	(106,795	)

	Three Months Ended June 30, 2016
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains and Losses onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at April 1	$	(53,928	)	$	110	$	(54,790	)	$	(108,608	)
Other comprehensive income before reclassifications	12			—		—			12
Losses reclassified from net accumulated other comprehensive loss	936			—		865			1,801
Net current period other comprehensive income	948			—		865			1,813
Accumulated other comprehensive (loss) income at June 30	$	(52,980	)	$	110	$	(53,925	)	$	(106,795	)

	Six Months Ended June 30, 2017
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at Jan. 1	$	(51,151	)	$	110	$	(59,313	)	$	(110,354	)
Other comprehensive income before reclassifications	26			1		—			27
Losses reclassified from net accumulated other comprehensive loss	1,628			—		1,904			3,532
Net current period other comprehensive income	1,654			1		1,904			3,559
Accumulated other comprehensive (loss) income at June 30	$	(49,497	)	$	111	$	(57,409	)	$	(106,795	)

	Six Months Ended June 30, 2016
(Thousands of Dollars)	Gains and Losses on Cash Flow Hedges			Unrealized Gains onMarketable Securities		Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive (loss) income at Jan. 1	$	(54,862	)	$	110	$	(55,001	)	$	(109,753	)
Other comprehensive income (loss) before reclassifications	8			—		(653		)	(645		)
Losses reclassified from net accumulated other comprehensive loss	1,874			—		1,729			3,603
Net current period other comprehensive income	1,882			—		1,076			2,958
Accumulated other comprehensive (loss) income at June 30	$	(52,980	)	$	110	$	(53,925	)	$	(106,795	)

Reclassifications out of Accumulated Other Comprehensive Loss

Reclassifications from accumulated other comprehensive loss for the three and six months ended June 30, 2017 and 2016 were as follows:

(Thousands of Dollars)	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
	Three Months Ended June 30, 2017				Three Months Ended June 30, 2016
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	1,319		(a)	$	1,483		(a)
Vehicle fuel derivatives	(5		)	(b)	47			(b)
Total, pre-tax	1,314				1,530
Tax benefit	(511		)		(594		)
Total, net of tax	803				936
Defined benefit pension and postretirement losses:
Amortization of net loss	1,621			(c)	1,478			(c)
Prior service credit	(57		)	(c)	(64		)	(c)
Total, pre-tax	1,564				1,414
Tax benefit	(608		)		(549		)
Total, net of tax	956				865
Total amounts reclassified, net of tax	$	1,759			$	1,801

	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
(Thousands of Dollars)	Six Months Ended June 30, 2017				Six Months Ended June 30, 2016
Losses (gains) on cash flow hedges:
Interest rate derivatives	$	2,678		(a)	$	2,968		(a)
Vehicle fuel derivatives	(5		)	(b)	104			(b)
Total, pre-tax	2,673				3,072
Tax benefit	(1,045		)		(1,198		)
Total, net of tax	1,628				1,874
Defined benefit pension and postretirement losses:
Amortization of net loss	3,244			(c)	2,956			(c)
Prior service credit	(117		)	(c)	(128		)	(c)
Total, pre-tax	3,127				2,828
Tax benefit	(1,223		)		(1,099		)
Total, net of tax	1,904				1,729
Total amounts reclassified, net of tax	$	3,532			$	3,603

^(a)  Included in interest charges.

^(b)  Included in O&M expenses.

^(c)  Included in the computation of net periodic pension and postretirement benefit costs. See Note 12 for details regarding these benefit plans.

XML

Balance Sheet Data, Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accounts receivable, net
Accounts receivable	$ 808,705	$ 827,112
Less allowance for bad debts	(49,327)	(50,823)
Accounts receivable, net	$ 759,378	$ 776,289

XML

Balance Sheet Related Disclosures, Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Public Utilities, Inventory [Line Items]
Inventories	$ 542,044	$ 604,226
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventories	321,426	312,430
Fuel
Public Utilities, Inventory [Line Items]
Inventories	156,736	181,752
Natural gas
Public Utilities, Inventory [Line Items]
Inventories	$ 63,882	$ 110,044

XML

Balance Sheet Related Disclosures, Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		$ 47,824,267	$ 46,832,219
Less accumulated depreciation		(14,703,391)	(14,381,603)
Property, plant and equipment, net		33,543,843	32,841,750
Electric plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		38,810,158	38,220,765
Natural gas plant
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		5,465,224	5,317,717
Common and other property
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,959,703	1,888,518
Plant to be retired
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	[1]	17,820	31,839
Construction work in progress
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		1,571,362	1,373,380
Nuclear fuel
Public Utility, Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross		2,660,606	2,571,770
Less accumulated depreciation		$ (2,237,639)	$ (2,180,636)

[1] In the second half of 2017, PSCo expects to both early retire Valmont Unit 5 and convert Cherokee Unit 4 from a coal-fueled generating facility to natural gas. PSCo also expects Craig Unit 1 to be early retired in approximately 2025. Amounts are presented net of accumulated depreciation.

XML

Income Taxes (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2015	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Examination [Line Items]
Number Of Years Of Tax Loss Carryback Period				2 years
Tax Adjustments, Settlements, and Unusual Provisions				$ 5,000,000	$ 17,000,000	$ 12,000,000	$ 15,000,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		$ (5,100,000)	$ (3,400,000)	$ (100,000)
Interest Expense related to unrecognized tax benefits		(1,700,000)	(3,300,000)
Unrecognized Tax Benefits [Abstract]
Unrecognized tax benefit — Permanent tax positions		30,800,000	29,600,000
Unrecognized tax benefit — Temporary tax positions		106,600,000	104,100,000
Total unrecognized tax benefit		137,400,000	133,700,000
NOL and tax credit carryforwards		(47,400,000)	(43,800,000)
Upper bound of decrease in unrecognized tax benefit that is reasonably possible		61,000,000
Amounts accrued for penalties related to unrecognized tax benefits		0	$ 0
Internal Revenue Service (IRS)
Tax Audits [Abstract]
Year(s) under examination	2012 and 2013						2010 and 2011
Year of carryback claim under examination							2009
Potential Tax Adjustments		$ 14,000,000
Earliest year subject to examination		2009
Colorado
Tax Audits [Abstract]
Earliest year subject to examination		2009
Minnesota
Tax Audits [Abstract]
Year(s) under examination			2010 through 2014
Earliest year subject to examination		2009
Texas
Tax Audits [Abstract]
Year(s) under examination			2009 and 2010
Earliest year subject to examination		2009
Wisconsin
Tax Audits [Abstract]
Year(s) under examination			2012 and 2013
Earliest year subject to examination		2012

XML

Rate Matters, NSP-Minnesota (Details) - USD ($) $ in Thousands	1 Months Ended							6 Months Ended
	Jun. 30, 2017	May 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Feb. 28, 2015	Nov. 30, 2013	Jun. 30, 2017
Minnesota Public Utilities Commission | Annual Automatic Adjustment of Charges
Rate Matters [Abstract]
Public Utilities; Approved Decrease Related To Disallowance Of Replacement Energy Costs		$ 4,400
NSP-Minnesota | FERC Proceeding, MISO ROE Complaint
Rate Matters [Abstract]
Public Utilities, Base Return On Equity Charged To Customers Through Transmission Formula Rates						12.38%	12.38%
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Recommended By Third Parties						8.67%	9.15%
NSP-Minnesota | Minnesota Public Utilities Commission | MPUC Proceeding - Minnesota 2016 Multi-Year Electric Rate Case
Rate Matters [Abstract]
Public Utilities, Number Of Years Rate Case Is Applicable For	4 years
Public Utilities, Approved Return on Equity, Percentage	9.20%
Public Utilities, Approved Equity Capital Structure, Percentage	52.50%
Public Utilities, Length of Stay-out Provision, In Years	4 years
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 184,970
Public Utilities, Increase (Decrease) Related to Sales True-up	59,750
Public Utilities, Rate Impact	244,720
NSP-Minnesota | Minnesota Public Utilities Commission | MPUC Proceeding - Minnesota 2016 Multi-Year Electric Rate Case, Rates 2016
Rate Matters [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	74,990
Public Utilities, Increase (Decrease) Related to Sales True-up	59,950
Public Utilities, Rate Impact	134,940
NSP-Minnesota | Minnesota Public Utilities Commission | MPUC Proceeding - Minnesota 2016 Multi-Year Electric Rate Case, Rates 2017
Rate Matters [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	59,860
Public Utilities, Increase (Decrease) Related to Sales True-up	0
Public Utilities, Rate Impact	59,860
NSP-Minnesota | Minnesota Public Utilities Commission | MPUC Proceeding - Minnesota 2016 Multi-Year Electric Rate Case, Rates 2018
Rate Matters [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	0
Public Utilities, Increase (Decrease) Related to Sales True-up	0
Public Utilities, Rate Impact	0
NSP-Minnesota | Minnesota Public Utilities Commission | MPUC Proceeding - Minnesota 2016 Multi-Year Electric Rate Case, Rates 2019
Rate Matters [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	50,120
Public Utilities, Increase (Decrease) Related to Sales True-up	(200)
Public Utilities, Rate Impact	$ 49,920
NSP-Minnesota | Federal Energy Regulatory Commission (FERC) | FERC Proceeding, MISO ROE Complaint
Rate Matters [Abstract]
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Approved			10.32%		10.32%
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Recommended					10.32%
Public Utilities, Length of Refund Period, In Months			15 months
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, with RTO Adder, Approved								10.82%
Public Utilities, ROE Basis Point Adder, Approved								50
NSP-Minnesota | Administrative Law Judge | FERC Proceeding, MISO ROE Complaint
Rate Matters [Abstract]
Public Utilities, ROE Applicable To Transmission Formula Rates In The MISO Region, Recommended By Third Parties				9.70%

XML

Rate Matters Rate Matters, NSP-Wisconsin (Details) - NSP-Wisconsin - Public Service Commission of Wisconsin (PSCW) $ in Millions	1 Months Ended
	May 31, 2017 USD ($)
PSCW Proceeding - Wisconsin 2018 Electric and Natural Gas Rate Case - Electric Rates 2018 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 24.7
Public Utilities, Requested Rate Increase (Decrease), Percentage	3.60%
Public Utilities, Requested Rate Base, Amount	$ 1,200.0
PSCW Proceeding - Wisconsin 2018 Electric and Natural Gas Rate Case - Gas Rates 2018 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 12.0
Public Utilities, Requested Rate Increase (Decrease), Percentage	10.10%
Public Utilities, Requested Rate Base, Amount	$ 138.4
PSCW Proceeding - Wisconsin 2018 Electric and Natural Gas Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.00%
Public Utilities, Requested Equity Capital Structure, Percentage	52.53%

XML

Rate Matters Rate Matters - PSCo (Details) - PSCo - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
CPUC Proceeding - Annual Electric Earnings Test 2015 through 2017
Public Utilities, General Disclosures [Line Items]
Public Utilities, Return on Equity Threshold for Earnings Sharing		9.83%
Colorado Public Utilities Commission [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 139.0
Public Utilities, Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates	93.9
Public Utilities, Rate Impact	232.9
Colorado Public Utilities Commission [Member] | CPUC Proceeding - Colorado 2018 Multi-Year Gas Rate Case, Gas Rates 2018 [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	63.2
Public Utilities, Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates	0.0
Public Utilities, Rate Impact	63.2
Public Utilities, Expected Year-End Rate Base	1,500.0
Colorado Public Utilities Commission [Member] | CPUC Proceeding - Colorado 2018 Multi-Year Gas Rate Case, Gas Rates 2019 [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	32.9
Public Utilities, Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates	93.9
Public Utilities, Rate Impact	126.8
Public Utilities, Expected Year-End Rate Base	2,300.0
Colorado Public Utilities Commission [Member] | CPUC Proceeding - Colorado 2018 Multi-Year Gas Rate Case, Gas Rates 2020 [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	42.9
Public Utilities, Pipeline System Integrity Adjustment (PSIA) revenue conversion to base rates	0.0
Public Utilities, Rate Impact	42.9
Public Utilities, Expected Year-End Rate Base	$ 2,400.0
Colorado Public Utilities Commission [Member] | CPUC Proceeding - Colorado 2018 Multi-Year Gas Rate Case [Domain]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.00%
Public Utilities, Requested Equity Capital Structure, Percentage	55.25%

XML

Rate Matters, SPS (Details) - SPS - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Jun. 30, 2017	Feb. 28, 2017	Nov. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
PUCT Proceeding - Appeal of the Texas 2015 Electric Rate Case Decision
Public Utilities, General Disclosures [Line Items]
Public Utilities, Revised Requested Rate Increase					$ 42.1
Texas 2016 TCRF Application [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 16.1
Public Utilities, Requested Rate Increase (Decrease), Percentage		1.80%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 14.4
NMPRC Proceeding - New Mexico 2016 Electric Rate Case
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 41.4
Public Utilities, Requested Rate Increase (Decrease), Percentage			10.90%
Public Utilities, Requested Return on Equity, Percentage			10.10%
Public Utilities, Requested Rate Base, Amount			$ 832.0
Public Utilities, Requested Equity Capital Structure, Percentage			53.97%
Public Utility Commission of Texas (PUCT) | PUCT Proceeding - Appeal of the Texas 2015 Electric Rate Case Decision
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Rate Decrease, Net of Rate Case Expenses				$ 4.0

XML

Commitments and Contingencies, Purchased Power Agreements (Details) - Independent Power Producing Entities	9 Months Ended
	Sep. 30, 2016 MW
Purchased Power Agreements [Abstract]
Generating capacity under long term purchased power agreements (in MW)	3,537
Purchase Power Agreement Expiration (Year)	2041

XML

Commitments and Contingencies, Guarantees and Indemnifications (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Guarantees [Abstract]
Assets held as collateral	$ 0	$ 0
Payment or Performance Guarantee
Guarantees [Abstract]
Guarantees issued and outstanding	18,300,000	18,800,000
Current exposure under these guarantees	0	100,000
Payment or Performance Guarantee | Surety Bonds
Guarantees [Abstract]
Guarantees issued and outstanding	$ 49,400,000	$ 43,000,000

XML

Commitments and Contingencies, Environmental Contingencies - Site Contingencies (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) Site	Dec. 31, 2016 USD ($)
Other MGP Sites [Member]
Manufactured Gas Plant (MGP) Site [Abstract]
Accrual for Environmental Loss Contingencies, Gross	$ 2.9	$ 2.0
Number of identified MGP sites under current investigation and/or remediation in addition to those separately disclosed	10
NSP-Wisconsin | Ashland MGP Site
Manufactured Gas Plant (MGP) Site [Abstract]
Number of properties not owned included in superfund site | Site	2
Accrual for Environmental Loss Contingencies, Gross	$ 46.8	64.3
Current Cost Estimate for Site Remediation	160.0
Estimated amount spent on cleanup	$ 113.2
Approved amortization period for recovery of remediation costs in natural gas rates (in years)	10
Carrying cost percentage to be applied to unamortized regulatory asset	3.00%
NSP-Minnesota | Fargo MGP Site
Manufactured Gas Plant (MGP) Site [Abstract]
Accrual for Environmental Loss Contingencies, Gross	$ 16.4	11.3
Current Cost Estimate for Site Remediation	23.0
Estimated amount spent on cleanup	$ 6.6
Percentage of Response Costs Allocable to the Minnesota Jurisdiction	12.00%
PSCW Proceeding - Gas Rate Case 2017 - Gas Rates 2017 | NSP-Wisconsin | Ashland MGP Site
Manufactured Gas Plant (MGP) Site [Abstract]
Public Utilities, Requested annual recovery collected through base rates		$ 12.4
PSCW Proceeding - Gas Rate Case 2017 - Gas Rates 2018 [Member] | NSP-Wisconsin | Ashland MGP Site
Manufactured Gas Plant (MGP) Site [Abstract]
Public Utilities, Requested annual recovery collected through base rates	$ 18.1

XML

Commitments and Contingencies, Environmental Contingencies - Unrecorded Unconditional Purchase Obligation (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2015
Regional Haze Rules
Environmental Requirements [Abstract]
Length of Time States Are Required to Revise Plans (in Years)	10 years
National Ambient Air Quality Standards for Ozone [Member]
Environmental Requirements [Abstract]
Former Level of Air Quality Concentrations (in parts per billion)		75
Revised Level of Air Quality Concentrations (in parts per billion)		70
SPS | National Ambient Air Quality Standards for Ozone [Member]
Environmental Requirements [Abstract]
Revised Level of Air Quality Concentrations (in parts per billion)	70
Harrington Units 1 and 2 [Member] | Capital Commitments | SPS | Regional Haze Rules
Environmental Requirements [Abstract]
Liability for Estimated Cost to Comply with Regulation	$ 400
Tolk Units 1 and 2 [Member] | Capital Commitments | SPS | Regional Haze Rules
Environmental Requirements [Abstract]
Liability for Estimated Cost to Comply with Regulation	$ 600

XML

Commitments and Contingencies, Legal Contingencies (Details)	1 Months Ended	6 Months Ended
	Dec. 31, 2015	Jun. 30, 2017	Dec. 31, 2009
Gas Trading Litigation
Legal Contingencies [Abstract]
Loss Contingency, Pending Claims, Number		7	13
Loss Contingency, Claims Settled, Number		5
Loss Contingency, Multi-District Litigation Claims, Number		1
Loss Contingency, Subset of Cases within Multi-District Litigation, Number		2
NSP-Wisconsin | Gas Trading Litigation
Legal Contingencies [Abstract]
Loss Contingency, Pending Claims, Number			2
PSCo | Line Extension Disputes
Legal Contingencies [Abstract]
Loss Contingency, Number of Plaintiffs		2
Minimum | PSCo | Line Extension Disputes
Legal Contingencies [Abstract]
Loss Contingency, Number of Plaintiffs	50

XML

Borrowings and Other Financing Instruments, Commercial Paper (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Amount outstanding at period end	$ 784,000,000	$ 392,000,000
Commercial Paper
Short-term Debt [Line Items]
Borrowing limit	2,750,000,000	2,750,000,000
Amount outstanding at period end	784,000,000	392,000,000
Average amount outstanding	778,000,000	485,000,000
Maximum amount outstanding	$ 1,247,000,000	$ 1,183,000,000
Weighted average interest rate, computed on a daily basis (percentage)	1.28%	0.74%
Weighted average interest rate at period end (percentage)	1.49%	0.95%

XML

Borrowings and Other Financing Instruments, Letters of Credit (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 784,000	$ 392,000
Letter of Credit
Line of Credit Facility [Line Items]
Amount outstanding at period end	$ 14,000	$ 19,000
Letter of Credit | Letter of Credit
Line of Credit Facility [Line Items]
Term of letters of credit (in years)	1 year

XML

Borrowings and Other Financing Instruments, Credit Facilities (Details) - Credit Facilities - USD ($)		6 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Credit Facility	[1]	$ 2,750,000,000
Drawn	[2]	798,000,000
Available		1,952,000,000
Direct advances on the credit facility outstanding		$ 0	$ 0
Xcel Energy Inc.
Line of Credit Facility [Line Items]
Maturity Date		Jun. 30, 2021
Credit Facility	[1]	$ 1,000,000,000
Drawn	[2]	549,000,000
Available		451,000,000
PSCo
Line of Credit Facility [Line Items]
Credit Facility	[1]	700,000,000
Drawn	[2]	3,000,000
Available		697,000,000
NSP-Minnesota
Line of Credit Facility [Line Items]
Credit Facility	[1]	500,000,000
Drawn	[2]	91,000,000
Available		409,000,000
SPS
Line of Credit Facility [Line Items]
Credit Facility	[1]	400,000,000
Drawn	[2]	109,000,000
Available		291,000,000
NSP-Wisconsin
Line of Credit Facility [Line Items]
Credit Facility	[1]	150,000,000
Drawn	[2]	46,000,000
Available		$ 104,000,000

[1] These credit facilities expire in June 2021.

[2] Includes outstanding commercial paper and letters of credit.

XML

Borrowings and Other Financing Instruments Borrowings and Other Financing Instruments, Long-Term Borrowings (Details) - PSCo - Bonds [Member] - Series Due June 15, 2047 [Member]	1 Months Ended
	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.80%
Maturity Date	Jun. 15, 2047

XML

Fair Value of Financial Assets and Liabilities (Details)	6 Months Ended
	Jun. 30, 2017
Minimum | Commingled and international equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period for investment redemption (in days)	1 day
Minimum | Real Estate Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period for investment redemption (in days)	45 days
Maximum | Commingled and international equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period for investment redemption (in days)	90 days
Maximum | Real Estate Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Notice period for investment redemption (in days)	90 days

XML

Fair Value of Financial Assets and Liabilities, Cost and Fair Value of Nuclear Decommissioning Fund (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
		Jun. 30, 2017		Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Gross Unrealized Gain		$ 462,300		$ 378,600
Available-for-sale Securities, Gross Unrealized Loss		34,200		46,900
Investments [Abstract]
Equity investments in unconsolidated subsidiaries		133,200		132,800
Miscellaneous investments		111,400		98,300
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		10,990	[1]	20,379	[2]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		1,558,914	[1]	1,528,993	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities		280,608	[1]	260,877	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Emerging market debt funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		96,008	[1]	93,597	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Commodity funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		106,571	[1]	106,571	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Private equity investments
Available-for-sale Securities [Abstract]
Available-for-sale Securities		138,889	[1]	132,190	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Real estate
Available-for-sale Securities [Abstract]
Available-for-sale Securities		131,270	[1]	128,630	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Other commingled funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		131,243	[1]	151,048	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Government securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		38,319	[1]	32,764	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		141,510	[1]	104,913	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Non U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		24,386	[1]	21,751	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Municipal bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			13,609
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Mortgage-backed securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			2,785
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		287,425	[1]	270,779	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Cost | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		171,695	[1]	189,100	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		10,990	[1]	20,379	[2]
Alternative Investments, Fair Value Disclosure		825,642	[1],[3]	839,465	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		1,986,995	[1]	1,860,762	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		0	[1],[3]	0	[2],[4]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Non U.S. equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		106,085	[1],[3]	112,233	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		297,966	[1]	245,359	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Emerging market debt funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		103,736	[1],[3]	97,543	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		103,736	[1]	97,543	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Commodity funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		82,897	[1],[3]	92,091	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		82,897	[1]	92,091	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Private equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		195,491	[1],[3]	190,462	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		195,491	[1]	190,462	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		195,515	[1],[3]	187,647	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		195,515	[1]	187,647	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Other commingled funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		141,918	[1],[3]	159,489	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		141,918	[1]	159,489	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		0	[1],[3]	0	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		37,844	[1]	31,965	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		0	[1],[3]	0	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		142,330	[1]	105,772	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Non U.S. corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		0	[1],[3]	0	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		24,859	[1]	21,672	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure	[2],[4]			0
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			13,786
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure	[2],[4]			0
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			2,816
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | U.S. equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		0	[1],[3]	0	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		526,581	[1]	473,400	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Non U.S. equities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investments, Fair Value Disclosure		0	[1],[3]	0	[2],[4]
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		226,868	[1]	218,381	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		10,990	[1]	20,379	[2]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		956,320	[1]	845,286	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities		191,881	[1]	133,126	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Emerging market debt funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Commodity funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Private equity investments
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Real estate
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Other commingled funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Government securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Non U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Municipal bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Mortgage-backed securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		526,581	[1]	473,400	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 1 | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		226,868	[1]	218,381	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0	[1]	0	[2]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		205,033	[1]	176,011	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Emerging market debt funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Commodity funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Private equity investments
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Real estate
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Other commingled funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Government securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		37,844	[1]	31,965	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		142,330	[1]	105,772	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Non U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		24,859	[1]	21,672	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Municipal bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			13,786
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Mortgage-backed securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			2,816
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 2 | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents		0	[1]	0	[2]
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Emerging market debt funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Commodity funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Private equity investments
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Real estate
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Other commingled funds
Available-for-sale Securities [Abstract]
Available-for-sale Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Government securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Non U.S. corporate bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Municipal bonds
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Mortgage-backed securities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Debt Securities	[2]			0
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		0	[1]	0	[2]
Nuclear Decommissioning Fund | Fair Value Measured on a Recurring Basis | Fair Value | Level 3 | Non U.S. equities
Available-for-sale Securities [Abstract]
Available-for-sale Securities, Equity Securities		$ 0	[1]	$ 0	[2]

[1] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $133.2 million of equity investments in unconsolidated subsidiaries and $111.4 million of rabbi trust assets and miscellaneous investments.

[2] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet, which also includes $132.8 million of equity investments in unconsolidated subsidiaries and $98.3 million of rabbi trust assets and miscellaneous investments.

[3] Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

[4] Due to limited availability of published pricing and a lack of immediate redeemability, certain fund investments measured at NAV are not required to be categorized within the fair value hierarchy.

XML

Fair Value of Financial Assets and Liabilities, Final Contractual Maturity Dates of Debt Securities in Nuclear Decommissioning Fund (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Final Contractual Maturity [Abstract]
Due in 1 Year or Less	$ 2,824
Due in 1 to 5 Years	58,577
Due in 5 to 10 Years	95,866
Due after 10 Years	47,766
Total	205,033
Government securities
Final Contractual Maturity [Abstract]
Due in 1 Year or Less	0
Due in 1 to 5 Years	2,770
Due in 5 to 10 Years	6,497
Due after 10 Years	28,577
Total	37,844
U.S. corporate bonds
Final Contractual Maturity [Abstract]
Due in 1 Year or Less	2,824
Due in 1 to 5 Years	44,843
Due in 5 to 10 Years	78,518
Due after 10 Years	16,145
Total	142,330
Non U.S. corporate bonds
Final Contractual Maturity [Abstract]
Due in 1 Year or Less	0
Due in 1 to 5 Years	10,964
Due in 5 to 10 Years	10,851
Due after 10 Years	3,044
Total	$ 24,859

XML

Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets and Liabilities, Cost and Fair Value of Rabbi Trust (Details) - Fair Value, Measured on a Recurring Basis - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Cost
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	$ 57,385	$ 49,494
Cost | Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	11,214	47,831
Cost | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	46,171	1,663
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	58,594	49,732
Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	58,594	49,732
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	0	0
Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	0	0
Fair Value | Rabbi Trust [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	11,214	47,831
Fair Value | Rabbi Trust [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	11,214	47,831
Fair Value | Rabbi Trust [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	0	0
Fair Value | Rabbi Trust [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents	[1]	0	0
Fair Value | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	47,380	1,901
Fair Value | Mutual Funds [Member] | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	47,380	1,901
Fair Value | Mutual Funds [Member] | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	0	0
Fair Value | Mutual Funds [Member] | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading Securities	[1]	$ 0	$ 0

[1] Reported in nuclear decommissioning fund and other investments on the consolidated balance sheet.

XML

Fair Value of Financial Assets and Liabilities, Derivative Instruments (Details) gal in Thousands, MWh in Thousands, MMBTU in Thousands, $ in Millions		Jun. 30, 2017 USD ($) gal MMBTU MWh Counterparty	Dec. 31, 2016 gal MMBTU MWh
Credit Concentration Risk
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure		10
Credit Concentration Risk | Municipal or Cooperative Entities or Other Utilities [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure		10
Credit Concentration Risk | No Investment Grade Ratings from External Credit Rating Agencies [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure		8
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties | $		$ 75.7
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		32.00%
Credit Concentration Risk | External Credit Rating, Investment Grade [Member]
Consideration of Credit Risk and Concentrations [Abstract]
Number of most significant counterparties for wholesale, trading and non-trading commodity activities with credit exposure		2
Wholesale, trading and non-trading commodity credit exposure for the most significant counterparties | $		$ 28.1
Percentage of wholesale, trading and non-trading commodity credit exposure for the most significant counterparties (in hundredths)		12.00%
Interest Rate Swap
Interest Rate Derivatives [Abstract]
Amount of accumulated other comprehensive gains (losses) related to interest rate derivatives expected to be reclassified into earnings within the next twelve months | $		$ (3.0)
Electric Commodity (in megawatt hours)
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]
Derivative, Nonmonetary Notional amount | MWh	[1],[2]	101,225	46,773
Natural Gas Commodity (in million British thermal units)
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]
Derivative, Nonmonetary Notional amount | MMBTU	[1],[2]	66,974	121,978
Vehicle Fuel Commodity (in gallons)
Gross Notional Amounts of Commodity Forwards, Options and FTRs [Abstract]
Derivative, Nonmonetary Notional amount | gal	[1],[2]	360	0

[1] Amounts are not reflective of net positions in the underlying commodities.

[2] Notional amounts for options are included on a gross basis, but are weighted for the probability of exercise.

XML

Fair Value of Financial Assets and Liabilities, Impact of Derivative Activity (Details) - USD ($)		3 Months Ended			6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017		Jun. 30, 2016
Financial Impact of Qualifying Fair Value Hedges on Earnings [Abstract]
Derivative instruments designated as fair value hedges		$ 0	$ 0		$ 0		$ 0
Recognized gains (losses) from fair value hedges or related hedged transactions		0	0		0		0
Designated as Hedging Instrument | Cash Flow Hedges
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		43,000	19,000		43,000		13,000
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		1,314,000	1,530,000		2,673,000		3,072,000
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0		0		0
Pre-tax gains (losses) recognized during the period in income		0	0		0		0
Designated as Hedging Instrument | Cash Flow Hedges | Interest Rate
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0		0		0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss	[1]	1,319,000	1,483,000		2,678,000		2,968,000
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0		0		0
Pre-tax gains (losses) recognized during the period in income		0	0		0		0
Designated as Hedging Instrument | Cash Flow Hedges | Vehicle Fuel And Other Commodity
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		43,000	19,000		43,000		13,000
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss	[2]	(5,000)	47,000		(5,000)		104,000
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0		0		0
Pre-tax gains (losses) recognized during the period in income		0	0		0		0
Other Derivative Instruments
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0		0		0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		(2,984,000)	5,358,000		(8,351,000)		2,391,000
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		(2,315,000)	16,642,000		(5,238,000)		39,199,000
Pre-tax gains (losses) recognized during the period in income		5,785,000	506,000		2,716,000		(3,509,000)
Other Derivative Instruments | Commodity Trading
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0		0		0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0		0		0
Pre-tax gains (losses) recognized during the period in income	[3]	5,785,000	481,000		6,786,000		1,490,000
Other Derivative Instruments | Electric Commodity
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0		0		0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		(1,299,000)	(705,000)		(505,000)		(970,000)
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)	[4]	(2,315,000)	16,642,000		(6,313,000)		27,533,000
Pre-tax gains (losses) recognized during the period in income		0	0		0		0
Other Derivative Instruments | Natural Gas Commodity
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in accumulated other comprehensive loss		0	0		0		0
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		(1,685,000)	6,063,000		(7,846,000)		3,361,000
Pre-tax (gains) losses reclassified into income during the period from accumulated other comprehensive loss		0	0		0		0
Pre-tax (gains) losses reclassified into income during the period from regulatory assets and (liabilities)		0	0		1,075,000	[5]	11,666,000	[5]
Pre-tax gains (losses) recognized during the period in income		0	$ 25,000	[5]	(4,070,000)	[5]	$ (4,999,000)	[5]
Other Derivative Instruments | Natural Gas Commodity for Electric Generation
Impact of Derivative Activity on Accumulated Other Comprehensive Loss, Regulatory Assets and Liabilities, and Income [Abstract]
Pre-tax fair value gains (losses) recognized during the period in regulatory (assets) and liabilities		$ 0			$ 900,000

[1] Amounts are recorded to interest charges.

[2] Amounts are recorded to operating and maintenance (O&M) expenses.

[3] Amounts are recorded to electric operating revenues. Portions of these gains and losses are subject to sharing with electric customers through margin-sharing mechanisms and deducted from gross revenue, as appropriate.

[4] Amounts are recorded to electric fuel and purchased power. These derivative settlement gain and loss amounts are shared with electric customers through fuel and purchased energy cost-recovery mechanisms, and reclassified out of income as regulatory assets or liabilities, as appropriate.

[5] Amounts for the three and six months ended June 30, 2017 included no settlement gains or losses and $0.9 million of settlement gains, respectively. Amounts for the three and six months ended June 30, 2016 included an immaterial amount of settlement losses. The remaining derivative settlement gains and losses for the three and six months ended June 30, 2017 and 2016 relate to natural gas operations and are recorded to cost of natural gas sold and transported. These gains and losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset or liability, as appropriate.

XML

Fair Value of Financial Assets and Liabilities, Credit Related Contingent Features (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Derivative instruments in a gross liability position	$ 0	$ 0
Collateral posted on derivative instruments	0	0
Collateral posted related to adequate assurance clauses in derivative contracts	$ 0	$ 0

XML

Fair Value of Financial Assets and Liabilities, Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands		Jun. 30, 2017		Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset		$ 0		$ 0
Derivative Liability, Collateral, Right to Reclaim Cash, Offset		3,500		3,700
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		78,487		38,224
Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		50,410		50,189
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		28,019		26,959
Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		136,255		148,146
Fair Value Measured on a Recurring Basis | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		72,861		32,761
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(13,031)	[1]	(22,613)	[2]
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		7,401		6,647
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(8,958)	[1]	(20,637)	[2]
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		64,021		17,275
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(4,048)	[1]	(1,976)	[2]
Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,439		8,839
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		0	[1]	0	[2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		28,858		25,458
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(7,307)	[1]	(7,323)	[2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		28,844		23,806
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(7,307)	[1]	(7,323)	[2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset				1,652
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[2]			0
Fair Value Measured on a Recurring Basis | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		5,189		4,155
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(13,353)	[1]	(22,950)	[2]
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		5,214		4,155
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(9,280)	[1]	(20,974)	[2]
Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(4,048)	[1]	(1,976)	[2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		12,437		12,786
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(10,522)	[1]	(10,727)	[2]
Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		12,437		12,786
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		(10,522)	[1]	(10,727)	[2]
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,974		13,179
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,974		13,179
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		250		100
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		250		100
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset				0
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		3,050		13,787
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		3,050		13,787
Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		98		89
Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		98		89
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		14,847		22,944
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		13,383		14,105
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,439		8,839
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		30,700		32,681
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		30,686		31,029
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset				1,652
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		11,443		11,320
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		11,443		11,320
Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		22,861		23,424
Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		22,861		23,424
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		68,071		19,251
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		2		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		68,069		19,251
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5,215		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5,215		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset				0
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		4,049		1,998
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		1		22
Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		4,048		1,976
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0		0
Fair Value, Measurements, Nonrecurring | Other Current Assets | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		5,626	[3]	5,463	[4]
Fair Value, Measurements, Nonrecurring | Other Noncurrent Assets | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		21,552	[3]	24,731	[4]
Fair Value, Measurements, Nonrecurring | Other Current Liabilities | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		22,830	[3]	22,804	[4]
Fair Value, Measurements, Nonrecurring | Other Noncurrent Liabilities | Purchased Power Agreements
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		123,818	[3]	135,360	[4]
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		85,892		55,374
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		16,359		27,284
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		68,069		19,251
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		1,439		8,839
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		36,165		32,781
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		36,151		31,129
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Other Derivative Instruments | Natural Gas Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset				1,652
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		18,542		27,105
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		14,494		25,129
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Other Derivative Instruments | Electric Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		4,048		1,976
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		22,959		23,513
Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Liabilities | Other Derivative Instruments | Commodity Trading
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		22,959		$ 23,513
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Other Current Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(25)
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		14
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		(25)
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	[1]	(25)
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 1 | Other Current Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 1 | Other Noncurrent Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 1 | Other Current Liabilities | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 2 | Other Current Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		25
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 2 | Other Noncurrent Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		14
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 2 | Other Current Liabilities | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 3 | Other Current Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 3 | Other Noncurrent Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Cash Flow Hedges | Fair Value Measured on a Recurring Basis | Level 3 | Other Current Liabilities | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		0
Cash Flow Hedges | Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		25
Cash Flow Hedges | Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Noncurrent Assets | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		14
Cash Flow Hedges | Estimate of Fair Value Measurement [Member] | Fair Value Measured on a Recurring Basis | Other Current Liabilities | Designated as Hedging Instrument | Vehicle Fuel And Other Commodity
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 0

[1] Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at June 30, 2017. At June 30, 2017, derivative assets and liabilities include no obligations to return cash collateral and the rights to reclaim cash collateral of $3.5 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

[2] Xcel Energy nets derivative instruments and related collateral in its consolidated balance sheet when supported by a legally enforceable master netting agreement, and all derivative instruments and related collateral amounts were subject to master netting agreements at Dec. 31, 2016. At Dec. 31, 2016, derivative assets and liabilities include no obligations to return cash collateral and rights to reclaim cash collateral of $3.7 million. The counterparty netting amounts presented exclude settlement receivables and payables and non-derivative amounts that may be subject to the same master netting agreements.

[3] During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

[4] During 2006, Xcel Energy qualified these contracts under the normal purchase exception. Based on this qualification, the contracts are no longer adjusted to fair value and the previous carrying value of these contracts will be amortized over the remaining contract lives along with the offsetting regulatory assets and liabilities.

XML

Fair Value of Financial Assets and Liabilities, Changes in Level 3 Commodity Derivatives (Details) - Commodity Contract - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance at beginning of period		$ 5,836,000	$ 6,854,000	$ 17,253,000	$ 18,028,000
Purchases		76,281,000	29,826,000	80,073,000	31,670,000
Settlements		(22,272,000)	(14,111,000)	(42,074,000)	(26,161,000)
Gains (losses) recognized in earnings	[1]	6,016,000	(18,000)	5,221,000	(43,000)
Net gains recognized as regulatory assets and liabilities		3,376,000	1,966,000	8,764,000	1,023,000
Balance at end of period		69,237,000	24,517,000	69,237,000	24,517,000
Transfers into Level 3		0	0	0	0
Transfers out of Level 3		$ 0	$ 0	$ 0	$ 0

[1] (a) These amounts relate to commodity derivatives held at the end of the period.

XML

Fair Value of Financial Assets and Liabilities, Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Carrying Amount
Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt, Including Current Portion	$ 14,597,178	$ 14,450,247
Fair Value
Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt, Including Current Portion	$ 15,879,594	$ 15,513,209

XML

Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Interest income	$ 2,107	$ 984	$ 5,907	$ 5,054
Other nonoperating income	1,523	1,496	5,168	2,176
Insurance policy expense	(1,022)	(920)	(2,021)	(1,420)
Other income, net	$ 2,608	$ 1,560	$ 9,054	$ 5,810

XML

Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Equity investments in unconsolidated subsidiaries	$ 133,200		$ 133,200		$ 132,800
Operating revenues	2,644,928	$ 2,499,849	5,591,350	$ 5,272,122
Net income (loss)	227,256	196,795	466,533	438,107
Regulated Electric
Segment Reporting Information [Line Items]
Operating revenues	2,338,450	2,224,563	4,637,807	4,410,017
Net income (loss)	227,562	205,440	421,715	383,677
Regulated Natural Gas
Segment Reporting Information [Line Items]
Equity investments in unconsolidated subsidiaries	133,200		133,200		$ 132,800
Operating revenues	290,124	259,140	916,091	825,116
Net income (loss)	13,166	11,933	76,093	90,271
All Other
Segment Reporting Information [Line Items]
Operating revenues	17,072	16,808	38,731	38,273
Net income (loss)	(13,472)	(20,578)	(31,275)	(35,841)
Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	2,644,928	2,499,849	5,591,350	5,272,122
Operating Segments | Regulated Electric
Segment Reporting Information [Line Items]
Operating revenues	2,338,017	2,224,142	4,637,077	4,409,261
Operating Segments | Regulated Natural Gas
Segment Reporting Information [Line Items]
Operating revenues	289,839	258,899	915,542	824,588
Operating Segments | All Other
Segment Reporting Information [Line Items]
Operating revenues	17,072	16,808	38,731	38,273
Intersegment Eliminations
Segment Reporting Information [Line Items]
Operating revenues	(718)	(662)	(1,279)	(1,284)
Net income (loss)	0	0	0	0
Intersegment Eliminations | Regulated Electric
Segment Reporting Information [Line Items]
Operating revenues	433	421	730	756
Intersegment Eliminations | Regulated Natural Gas
Segment Reporting Information [Line Items]
Operating revenues	285	241	549	528
Intersegment Eliminations | All Other
Segment Reporting Information [Line Items]
Operating revenues	$ 0	$ 0	$ 0	$ 0

XML

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Dilutive Impact of Common Stock Equivalents on Earnings per Share (Abstract]
Net income	$ 227,256	$ 196,795	$ 466,533	$ 438,107
Basic earnings per share [Abstract]
Earnings available to common shareholders	$ 227,256	$ 196,795	$ 466,533	$ 438,107
Weighted average common shares outstanding - basic (in shares)	508,542	508,930	508,411	508,789
Earnings available to common shareholders - basic (in dollars per share)	$ 0.45	$ 0.39	$ 0.92	$ 0.86
Effect of dilutive securities [Abstract]
Time based equity awards (in shares)	593	560	544	522
Diluted earnings per share [Abstract]
Earnings available to common shareholders	$ 227,256	$ 196,795	$ 466,533	$ 438,107
Weighted average common shares outstanding - diluted (in shares)	509,135	509,490	508,955	509,311
Earnings available to common shareholders - diluted (in dollars per share)	$ 0.45	$ 0.39	$ 0.92	$ 0.86

XML

Benefit Plans and Other Postretirement Benefits (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2017 USD ($) Plan	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Pension Benefits
Components of Net Periodic Benefit Cost [Abstract]
Service cost		$ 23,547	$ 22,945	$ 47,094	$ 45,865
Interest cost		36,702	40,028	73,404	80,051
Expected return on plan assets		(52,318)	(52,575)	(104,635)	(105,150)
Amortization of prior service credit		(442)	(477)	(884)	(961)
Amortization of net loss		26,671	24,385	53,341	48,770
Net periodic benefit cost (credit)		34,160	34,306	68,320	68,575
Costs not recognized due to the effects of regulation		(3,899)	(4,159)	(7,914)	(8,611)
Net benefit cost (credit) recognized for financial reporting		30,261	30,147	60,406	59,964
Total contributions to Xcel Energy's pension plans during the period	$ 150,000
Number of pension plans to which contributions were made | Plan	4
Postretirement Health Care Benefits
Components of Net Periodic Benefit Cost [Abstract]
Service cost		465	431	930	863
Interest cost		5,984	6,526	11,968	13,053
Expected return on plan assets		(6,155)	(6,248)	(12,311)	(12,497)
Amortization of prior service credit		(2,672)	(2,671)	(5,343)	(5,343)
Amortization of net loss		1,672	1,009	3,344	2,020
Net periodic benefit cost (credit)		(706)	(953)	(1,412)	(1,904)
Costs not recognized due to the effects of regulation		0	0	0	0
Net benefit cost (credit) recognized for financial reporting		$ (706)	$ (953)	$ (1,412)	$ (1,904)

XML

Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period			$ 11,020,849
(Gains) losses reclassified from net accumulated other comprehensive loss	$ 1,759	$ 1,801	3,532	$ 3,603
Accumulated other comprehensive income (loss) at end of period	11,123,155		11,123,155
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	(50,326)	(53,928)	(51,151)	(54,862)
Other comprehensive income (loss) before reclassifications	26	12	26	8
(Gains) losses reclassified from net accumulated other comprehensive loss	803	936	1,628	1,874
Net current period other comprehensive income (loss)	829	948	1,654	1,882
Accumulated other comprehensive income (loss) at end of period	(49,497)	(52,980)	(49,497)	(52,980)
Unrealized Gains and Losses on Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	110	110	110	110
Other comprehensive income (loss) before reclassifications	1	0	1	0
(Gains) losses reclassified from net accumulated other comprehensive loss	0	0	0	0
Net current period other comprehensive income (loss)	1	0	1	0
Accumulated other comprehensive income (loss) at end of period	111	110	111	110
Defined Benefit Pension and Postretirement Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	(58,365)	(54,790)	(59,313)	(55,001)
Other comprehensive income (loss) before reclassifications	0	0	0	(653)
(Gains) losses reclassified from net accumulated other comprehensive loss	956	865	1,904	1,729
Net current period other comprehensive income (loss)	956	865	1,904	1,076
Accumulated other comprehensive income (loss) at end of period	(57,409)	(53,925)	(57,409)	(53,925)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss) at beginning of period	(108,581)	(108,608)	(110,354)	(109,753)
Other comprehensive income (loss) before reclassifications	27	12	27	(645)
(Gains) losses reclassified from net accumulated other comprehensive loss	1,759	1,801	3,532	3,603
Net current period other comprehensive income (loss)	1,786	1,813	3,559	2,958
Accumulated other comprehensive income (loss) at end of period	$ (106,795)	$ (106,795)	$ (106,795)	$ (106,795)

XML

Other Comprehensive Income (Reclassifications from AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating and maintenance expenses		$ 578,133	$ 596,978	$ 1,164,563	$ 1,174,388
Total, pre-tax		(329,645)	(301,192)	(685,586)	(671,154)
Tax benefit		102,389	104,397	219,053	233,047
Total amounts reclassified, net of tax		1,759	1,801	3,532	3,603
Gains and Losses on Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified, net of tax		803	936	1,628	1,874
Gains and Losses on Cash Flow Hedges | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, pre-tax		1,314	1,530	2,673	3,072
Tax benefit		(511)	(594)	(1,045)	(1,198)
Total, net of tax		803	936	1,628	1,874
Prior service credit | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, pre-tax	[1]	1,621	1,478	3,244	2,956
Amortization of net loss | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, pre-tax	[1]	(57)	(64)	(117)	(128)
Defined Benefit Pension and Postretirement Items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total amounts reclassified, net of tax		956	865	1,904	1,729
Defined Benefit Pension and Postretirement Items | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total, pre-tax		1,564	1,414	3,127	2,828
Tax benefit		(608)	(549)	(1,223)	(1,099)
Total amounts reclassified, net of tax		956	865	1,904	1,729
Interest Rate Swap | Gains and Losses on Cash Flow Hedges | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest charges	[2]	1,319	1,483	2,678	2,968
Vehicle Fuel Derivatives | Gains and Losses on Cash Flow Hedges | Amounts Reclassified from Accumulated Other Comprehensive Loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating and maintenance expenses	[3]	$ (5)	$ 47	$ (5)	$ 104

[1] Included in the computation of net periodic pension and postretirement benefit costs. See Note 12 for details regarding these benefit plans.

[2] Included in interest charges.

[3] Included in O&M expenses.