10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended June 30, 2019

OR

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

For the transition period from ________________ to ___________________

Commission File Number	Registrant; State of Incorporation; Address; and Telephone Number	IRS Employer Identification No.
001-09057	WEC ENERGY GROUP, INC.	39-1391525

(A Wisconsin Corporation)

231 West Michigan Street

P. O. Box 1331

Milwaukee, WI 53201

(414) 221-2345

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol(s)	Name of Each Exchange on Which Registered
Common Stock, $.01 Par Value	WEC	New York Stock Exchange

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. 

Yes ☒    No ☐

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

Yes ☒    No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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	☒	Accelerated filer	☐
Non-accelerated filer	☐	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 ☐    No ☒

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date (June 30, 2019):

Common Stock, $.01 Par Value, 315,435,820 shares outstanding

WEC ENERGY GROUP, INC.

QUARTERLY REPORT ON FORM 10-Q

For the Quarter Ended June 30, 2019

TABLE OF CONTENTS

				Page
	CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION			1
PART I.	FINANCIAL INFORMATION			3
ITEM 1.	FINANCIAL STATEMENTS (UNAUDITED)			3
	Condensed Consolidated Income Statements			3
	Condensed Consolidated Statements of Comprehensive Income			4
	Condensed Consolidated Balance Sheets			5
	Condensed Consolidated Statements of Cash Flows			6
	Condensed Consolidated Statements of Equity			7
	Notes to Condensed Consolidated Financial Statements			9
			Page
	Note 1	General Information	9
	Note 2	Acquisitions	9
	Note 3	Disposition	10
	Note 4	Operating Revenues	10
	Note 5	Regulatory Assets and Liabilities	14
	Note 6	Property, Plant, and Equipment	15
	Note 7	Common Equity	16
	Note 8	Short-Term Debt and Lines of Credit	16
	Note 9	Long-Term Debt	17
	Note 10	Leases	17
	Note 11	Materials, Supplies, and Inventories	20
	Note 12	Income Taxes	21
	Note 13	Fair Value Measurements	21
	Note 14	Derivative Instruments	23
	Note 15	Guarantees	26
	Note 16	Employee Benefits	26
	Note 17	Goodwill	27
	Note 18	Investment in Transmission Affiliates	27
	Note 19	Segment Information	29
	Note 20	Variable Interest Entities	31
	Note 21	Commitments and Contingencies	32
	Note 22	Supplemental Cash Flow Information	35
	Note 23	Regulatory Environment	36
	Note 24	New Accounting Pronouncements	38
ITEM 2.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS			40
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK			68
ITEM 4.	CONTROLS AND PROCEDURES			68
PART II.	OTHER INFORMATION			69
ITEM 1.	LEGAL PROCEEDINGS			69
ITEM 1A.	RISK FACTORS			69
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS			70
ITEM 6.	EXHIBITS			70
SIGNATURE				71

06/30/2019 Form 10-Q i WEC Energy Group, Inc.

GLOSSARY OF TERMS AND ABBREVIATIONS

The abbreviations and terms set forth below are used throughout this report and have the meanings assigned to them below:

Subsidiaries and Affiliates
ATC	American Transmission Company LLC
ATC Holdco	ATC Holdco LLC
ATC Holding	ATC Holding LLC
Bishop Hill III	Bishop Hill Energy III LLC
Bluewater	Bluewater Natural Gas Holding, LLC
Coyote Ridge	Coyote Ridge Wind, LLC
Integrys	Integrys Holding, Inc.
MERC	Minnesota Energy Resources Corporation
MGU	Michigan Gas Utilities Corporation
NSG	North Shore Gas Company
PDL	WPS Power Development, LLC
PGL	The Peoples Gas Light and Coke Company
UMERC	Upper Michigan Energy Resources Corporation
Upstream	Upstream Wind Energy LLC
WE	Wisconsin Electric Power Company
We Power	W.E. Power, LLC
WG	Wisconsin Gas LLC
WPS	Wisconsin Public Service Corporation
Federal and State Regulatory Agencies
EPA	United States Environmental Protection Agency
FERC	Federal Energy Regulatory Commission
ICC	Illinois Commerce Commission
IEPA	Illinois Environmental Protection Agency
IRS	United States Internal Revenue Service
MDEQ	Michigan Department of Environmental Quality
MPSC	Michigan Public Service Commission
MPUC	Minnesota Public Utilities Commission
PSCW	Public Service Commission of Wisconsin
SEC	United States Securities and Exchange Commission
Accounting Terms
AFUDC	Allowance for Funds Used During Construction
ASU	Accounting Standards Update
FASB	Financial Accounting Standards Board
GAAP	United States Generally Accepted Accounting Principles
LIFO	Last-In, First-Out
OPEB	Other Postretirement Employee Benefits
Environmental Terms
ACE	Affordable Clean Energy
BATW	Bottom Ash Transport Water
BSER	Best System of Emission Reduction
BTA	Best Technology Available
CAA	Clean Air Act
CO2	Carbon Dioxide
ELG	Steam Electric Effluent Limitation Guidelines
FGD	Flue Gas Desulfurization

06/30/2019 Form 10-Q ii WEC Energy Group, Inc.

GHG	Greenhouse Gas
MATS	Mercury and Air Toxics Standards
NOV	Notice of Violation
RTR	Risk and Technology Review
VN	Violation Notice
Measurements
Dth	Dekatherm
MW	Megawatt
MWh	Megawatt-hour
Other Terms and Abbreviations
2007 Junior Notes	WEC Energy Group, Inc.'s 2007 Junior Subordinated Notes Due 2067
AG	Attorney General
ALJ	Administrative Law Judge
AMI	Advanced Metering Infrastructure
Badger Hollow I	Badger Hollow Solar Farm I
Badger Hollow II	Badger Hollow Solar Farm II
ERGS	Elm Road Generating Station
Exchange Act	Securities Exchange Act of 1934, as amended
FTR	Financial Transmission Rights
MISO	Midcontinent Independent System Operator, Inc.
OCPP	Oak Creek Power Plant
OC 5	Oak Creek Power Plant Unit 5
OC 6	Oak Creek Power Plant Unit 6
OC 7	Oak Creek Power Plant Unit 7
OC 8	Oak Creek Power Plant Unit 8
PIPP	Presque Isle Power Plant
QIP	Qualifying Infrastructure Plant
ROE	Return on Equity
SMP	Natural Gas System Modernization Program
SMRP	System Modernization and Reliability Project
SSR	System Support Resource
Tax Legislation	Tax Cuts and Jobs Act of 2017
Tilden	Tilden Mining Company

06/30/2019 Form 10-Q iii WEC Energy Group, Inc.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

In this report, we make statements concerning our expectations, beliefs, plans, objectives, goals, strategies, and future events or performance. These statements are "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. Readers are cautioned not to place undue reliance on these forward-looking statements. Forward-looking statements may be identified by reference to a future period or periods or by the use of terms such as "anticipates," "believes," "could," "estimates," "expects," "forecasts," "goals," "guidance," "intends," "may," "objectives," "plans," "possible," "potential," "projects," "seeks," "should," "targets," "will," or variations of these terms.

Forward-looking statements include, among other things, statements concerning management's expectations and projections regarding earnings, completion of capital projects, sales and customer growth, rate actions and related filings with regulatory authorities, environmental and other regulations and associated compliance costs, legal proceedings, dividend payout ratios, effective tax rates, pension and OPEB plans, fuel costs, sources of electric energy supply, coal and natural gas deliveries, remediation costs, environmental matters, liquidity and capital resources, and other matters.

Forward-looking statements are subject to a number of risks and uncertainties that could cause our actual results to differ materially from those expressed or implied in the statements. These risks and uncertainties include those described in risk factors as set forth in this report and our 2018 Annual Report on Form 10-K, and those identified below:

• Factors affecting utility operations such as catastrophic weather-related damage, environmental incidents, unplanned facility outages and repairs and maintenance, and electric transmission or natural gas pipeline system constraints;

• Factors affecting the demand for electricity and natural gas, including political developments, unusual weather, changes in economic conditions, customer growth and declines, commodity prices, energy conservation efforts, and continued adoption of distributed generation by customers;

• The timing, resolution, and impact of rate cases and negotiations, including recovery of deferred and current costs and the ability to earn a reasonable return on investment, and other regulatory decisions impacting our regulated operations;

• The ability to obtain and retain customers, including wholesale customers, due to increased competition in our electric and natural gas markets from retail choice and alternative electric suppliers, and continued industry consolidation;

• The timely completion of capital projects within budgets, as well as the recovery of the related costs through rates;

• The impact of federal, state, and local legislative and/or regulatory changes, including changes in rate-setting policies or procedures, deregulation and restructuring of the electric and/or natural gas utility industries, transmission or distribution system operation, the approval process for new construction, reliability standards, pipeline integrity and safety standards, allocation of energy assistance, energy efficiency mandates, and tax laws that affect our ability to use production tax credits and investment tax credits;

• The remaining uncertainty surrounding the Tax Legislation enacted in December 2017, including implementing regulations and IRS interpretations, the amount to be returned to our ratepayers, and any further impact on our and our subsidiaries’ credit ratings;

• Federal and state legislative and regulatory changes relating to the environment, including climate change and other environmental regulations impacting generation facilities and renewable energy standards, the enforcement of these laws and regulations, changes in the interpretation of regulations or permit conditions by regulatory agencies, and the recovery of associated remediation and compliance costs;

• Factors affecting the implementation of our generation reshaping plan, including related regulatory decisions, the cost of materials, supplies, and labor, and the feasibility of competing projects;

• Increased pressure on us by investors and other stakeholder groups to take more aggressive action to reduce future GHG emissions in order to limit future global temperature increases;

• The risks associated with changing commodity prices, particularly natural gas and electricity, and the availability of sources of fossil fuel, natural gas, purchased power, materials needed to operate environmental controls at our electric generating facilities,

06/30/2019 Form 10-Q 1 WEC Energy Group, Inc.

or water supply due to high demand, shortages, transportation problems, nonperformance by electric energy or natural gas suppliers under existing power purchase or natural gas supply contracts, or other developments;

• Changes in credit ratings, interest rates, and our ability to access the capital markets, caused by volatility in the global credit markets, our capitalization structure, and market perceptions of the utility industry, us, or any of our subsidiaries;

• Costs and effects of litigation, administrative proceedings, investigations, settlements, claims, and inquiries;

• Restrictions imposed by various financing arrangements and regulatory requirements on the ability of our subsidiaries to transfer funds to us in the form of cash dividends, loans or advances, that could prevent us from paying our common stock dividends, taxes, and other expenses, and meeting our debt obligations;

• The risk of financial loss, including increases in bad debt expense, associated with the inability of our customers, counterparties, and affiliates to meet their obligations;

• Changes in the creditworthiness of the counterparties with whom we have contractual arrangements, including participants in the energy trading markets and fuel suppliers and transporters;

• The direct or indirect effect on our business resulting from terrorist attacks and cyber security intrusions, as well as the threat of such incidents, including the failure to maintain the security of personally identifiable information, the associated costs to protect our utility assets, technology systems, and personal information, and the costs to notify affected persons to mitigate their information security concerns and to comply with state notification laws;

• The financial performance of ATC and its corresponding contribution to our earnings, as well as the ability of ATC and Duke-American Transmission Company to obtain the required approvals for their transmission projects;

• The investment performance of our employee benefit plan assets, as well as unanticipated changes in related actuarial assumptions, which could impact future funding requirements;

• Factors affecting the employee workforce, including loss of key personnel, internal restructuring, work stoppages, and collective bargaining agreements and negotiations with union employees;

• Advances in technology, and related legislation or regulation supporting the use of that technology, that result in competitive disadvantages and create the potential for impairment of existing assets;

• The risk associated with the values of goodwill and other intangible assets and their possible impairment;

• Potential business strategies to acquire and dispose of assets or businesses, which cannot be assured to be completed timely, if at all, or within budgets, and legislative or regulatory restrictions or caps on non-utility acquisitions, investments or projects, including the State of Wisconsin's public utility holding company law;

• The timing and outcome of any audits, disputes, and other proceedings related to taxes;

• The ability to maintain effective internal controls in accordance with Section 404 of the Sarbanes-Oxley Act, while both integrating and continuing to consolidate our enterprise systems;

• The effect of accounting pronouncements issued periodically by standard-setting bodies; and

• Other considerations disclosed elsewhere herein and in other reports we file with the SEC or in other publicly disseminated written documents.

We expressly disclaim any obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.

06/30/2019 Form 10-Q 2 WEC Energy Group, Inc.

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

WEC ENERGY GROUP, INC.

CONDENSED CONSOLIDATED INCOME STATEMENTS (Unaudited)	Three Months Ended						Six Months Ended
	June 30						June 30
(in millions, except per share amounts)	2019			2018			2019			2018
Operating revenues	$	1,590.2		$	1,672.5		$	3,967.6		$	3,959.0
Operating expenses
Cost of sales	491.9			547.7			1,501.5			1,519.8
Other operation and maintenance	503.6			537.7			1,054.2			1,049.6
Depreciation and amortization	229.9			206.7			456.3			415.3
Property and revenue taxes	50.2			49.6			98.2			98.4
Total operating expenses	1,275.6			1,341.7			3,110.2			3,083.1
Operating income	314.6			330.8			857.4			875.9
Equity in earnings of transmission affiliates	36.9			28.7			73.0			61.5
Other income, net	23.6			31.4			54.5			38.9
Interest expense	124.1			108.5			248.5			215.2
Other expense	(63.6		)	(48.4		)	(121.0		)	(114.8		)
Income before income taxes	251.0			282.4			736.4			761.1
Income tax expense	15.2			51.1			80.2			139.4
Net income	235.8			231.3			656.2			621.7
Preferred stock dividends of subsidiary	0.3			0.3			0.6			0.6
Net loss attributed to noncontrolling interests	0.2			—			0.2			—
Net income attributed to common shareholders	$	235.7		$	231.0		$	655.8		$	621.1
Earnings per share
Basic	$	0.75		$	0.73		$	2.08		$	1.97
Diluted	$	0.74		$	0.73		$	2.07		$	1.96
Weighted average common shares outstanding
Basic	315.4			315.5			315.4			315.5
Diluted	316.7			316.9			316.7			316.9

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

06/30/2019 Form 10-Q 3 WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)	Three Months Ended						Six Months Ended
	June 30						June 30
(in millions)	2019			2018			2019			2018
Net income	$	235.8		$	231.3		$	656.2		$	621.7
Other comprehensive loss, net of tax
Derivatives accounted for as cash flow hedges
Derivative losses, net of tax benefit of $(0.9), $0, $(1.3), and $0, respectively	(2.3		)	—			(3.5		)	—
Reclassification of net gains to net income, net of tax	(0.3		)	(0.4		)	(0.6		)	(0.6		)
Cash flow hedges, net	(2.6		)	(0.4		)	(4.1		)	(0.6		)
Defined benefit plans
Amortization of pension and OPEB costs (credits) included in net periodic benefit cost, net of tax	—			(1.7		)	0.1			0.2
Other comprehensive loss, net of tax	(2.6		)	(2.1		)	(4.0		)	(0.4		)
Comprehensive income	233.2			229.2			652.2			621.3
Preferred stock dividends of subsidiary	0.3			0.3			0.6			0.6
Comprehensive loss attributed to noncontrolling interests	0.2			—			0.2			—
Comprehensive income attributed to common shareholders	$	233.1		$	228.9		$	651.8		$	620.7

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

06/30/2019 Form 10-Q 4 WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (in millions, except share and per share amounts)	June 30, 2019			December 31, 2018
Assets
Current assets
Cash and cash equivalents	$	37.9		$	84.5
Accounts receivable and unbilled revenues, net of reserves of $143.3 and $149.2, respectively	1,004.3			1,280.9
Materials, supplies, and inventories	461.4			548.2
Prepayments	254.8			256.8
Other	80.3			77.2
Current assets	1,838.7			2,247.6
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $8,705.0 and $8,636.6, respectively	22,535.8			22,000.9
Regulatory assets	4,007.0			3,805.1
Equity investment in transmission affiliates	1,696.5			1,665.3
Goodwill	3,052.8			3,052.8
Other	803.5			704.1
Long-term assets	32,095.6			31,228.2
Total assets	$	33,934.3		$	33,475.8
Liabilities and Equity
Current liabilities
Short-term debt	$	1,262.7		$	1,440.1
Current portion of long-term debt	766.5			365.0
Accounts payable	715.6			876.4
Accrued payroll and benefits	159.3			185.4
Other	457.9			464.8
Current liabilities	3,362.0			3,331.7
Long-term liabilities
Long-term debt	9,921.0			9,994.0
Deferred income taxes	3,598.1			3,388.1
Deferred revenue, net	508.7			520.4
Regulatory liabilities	4,243.6			4,251.6
Environmental remediation liabilities	631.8			616.4
Pension and OPEB obligations	414.0			422.8
Other	1,106.8			1,108.1
Long-term liabilities	20,424.0			20,301.4
Commitments and contingencies (Note 21)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,435,820 and 315,523,192 shares outstanding, respectively	3.2			3.2
Additional paid in capital	4,197.9			4,250.1
Retained earnings	5,821.7			5,538.2
Accumulated other comprehensive loss	(6.6		)	(2.6		)
Common shareholders' equity	10,016.2			9,788.9
Preferred stock of subsidiary	30.4			30.4
Noncontrolling interests	101.7			23.4
Total liabilities and equity	$	33,934.3		$	33,475.8

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

06/30/2019 Form 10-Q 5 WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)	Six Months Ended
	June 30
(in millions)	2019			2018
Operating Activities
Net income	$	656.2		$	621.7
Reconciliation to cash provided by operating activities
Depreciation and amortization	456.3			415.3
Deferred income taxes and investment tax credits, net	96.1			31.7
Contributions and payments related to pension and OPEB plans	(8.3		)	(9.7		)
Equity income in transmission affiliates, net of distributions	(9.4		)	4.9
Change in –
Accounts receivable and unbilled revenues	267.9			235.5
Materials, supplies, and inventories	87.0			72.6
Other current assets	20.0			78.8
Accounts payable	(222.7		)	(85.0		)
Other current liabilities	(55.1		)	0.1
Other, net	3.2			147.5
Net cash provided by operating activities	1,291.2			1,513.4
Investing Activities
Capital expenditures	(855.2		)	(915.5		)
Acquisition of Upstream, net of cash and restricted cash acquired of $9.2	(268.2		)	—
Acquisition of Forward Wind Energy Center	—			(77.1		)
Capital contributions to transmission affiliates	(21.9		)	(32.4		)
Proceeds from the sale of assets and businesses	30.0			7.9
Proceeds from the sale of investments held in rabbi trust	0.1			16.5
Reimbursement for ATC's construction costs	32.4			—
Other, net	16.4			3.8
Net cash used in investing activities	(1,066.4		)	(996.8		)
Financing Activities
Exercise of stock options	50.1			5.1
Purchase of common stock	(106.3		)	(19.8		)
Dividends paid on common stock	(372.3		)	(348.7		)
Issuance of long-term debt	350.0			600.0
Retirement of long-term debt	(17.3		)	(681.4		)
Change in short-term debt	(177.4		)	(74.6		)
Other, net	(7.0		)	(3.8		)
Net cash used in financing activities	(280.2		)	(523.2		)
Net change in cash, cash equivalents, and restricted cash	(55.4		)	(6.6		)
Cash, cash equivalents, and restricted cash at beginning of period	146.1			58.6
Cash, cash equivalents, and restricted cash at end of period	$	90.7		$	52.0

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

06/30/2019 Form 10-Q 6 WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited)
	WEC Energy Group Common Shareholders' Equity
(in millions, except per share amounts)	Common Stock		Additional Paid In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Total Common Shareholders' Equity			Preferred Stock of Subsidiary		Non-controlling Interests			Total Equity
Balance at December 31, 2018	$	3.2	$	4,250.1		$	5,538.2		$	(2.6	)	$	9,788.9		$	30.4	$	23.4		$	9,842.7
Net income attributed to common shareholders	—		—			420.1			—			420.1			—		—			420.1
Other comprehensive loss	—		—			—			(1.4		)	(1.4		)	—		—			(1.4		)
Common stock dividends of $0.59 per share	—		—			(186.2		)	—			(186.2		)	—		—			(186.2		)
Exercise of stock options	—		32.6			—			—			32.6			—		—			32.6
Purchase of common stock	—		(70.7		)	—			—			(70.7		)	—		—			(70.7		)
Acquisition of a noncontrolling interest	—		—			—			—			—			—		69.0			69.0
Capital contributions from noncontrolling interest	—		—			—			—			—			—		4.8			4.8
Stock-based compensation and other	—		1.2			—			—			1.2			—		—			1.2
Balance at March 31, 2019	$	3.2	$	4,213.2		$	5,772.1		$	(4.0	)	$	9,984.5		$	30.4	$	97.2		$	10,112.1
Net income attributed to common shareholders	—		—			235.7			—			235.7			—		—			235.7
Other comprehensive loss	—		—			—			(2.6		)	(2.6		)	—		—			(2.6		)
Common stock dividends of $0.59 per share	—		—			(186.1		)	—			(186.1		)	—		—			(186.1		)
Exercise of stock options	—		17.5			—			—			17.5			—		—			17.5
Purchase of common stock	—		(35.6		)	—			—			(35.6		)	—		—			(35.6		)
Capital contributions from noncontrolling interest	—		—			—			—			—			—		5.4			5.4
Distributions to noncontrolling interests	—		—			—			—			—			—		(0.9		)	(0.9		)
Stock-based compensation and other	—		2.8			—			—			2.8			—		—			2.8
Balance at June 30, 2019	$	3.2	$	4,197.9		$	5,821.7		$	(6.6	)	$	10,016.2		$	30.4	$	101.7		$	10,148.3

06/30/2019 Form 10-Q 7 WEC Energy Group, Inc.

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (continued)
	WEC Energy Group Common Shareholders' Equity
(in millions, except per share amounts)	Common Stock		Additional Paid In Capital			Retained Earnings			Accumulated Other Comprehensive Income			Total Common Shareholders' Equity			Preferred Stock of Subsidiary		Non-controlling Interests		Total Equity
Balance at December 31, 2017	$	3.2	$	4,278.5		$	5,176.8		$	2.9		$	9,461.4		$	30.4	$	—	$	9,491.8
Net income attributed to common shareholders	—		—			390.1			—			390.1			—		—		390.1
Other comprehensive income	—		—			—			1.7			1.7			—		—		1.7
Common stock dividends of $0.5525 per share	—		—			(174.2		)	—			(174.2		)	—		—		(174.2		)
Exercise of stock options	—		2.1			—			—			2.1			—		—		2.1
Purchase of common stock	—		(15.8		)	—			—			(15.8		)	—		—		(15.8		)
Stock-based compensation and other	—		2.5			—			—			2.5			—		—		2.5
Balance at March 31, 2018	$	3.2	$	4,267.3		$	5,392.7		$	4.6		$	9,667.8		$	30.4	$	—	$	9,698.2
Net income attributed to common shareholders	—		—			231.0			—			231.0			—		—		231.0
Other comprehensive loss	—		—			—			(2.1		)	(2.1		)	—		—		(2.1		)
Common stock dividends of $0.5525 per share	—		—			(174.5		)	—			(174.5		)	—		—		(174.5		)
Exercise of stock options	—		3.0			—			—			3.0			—		—		3.0
Purchase of common stock	—		(4.0		)	—			—			(4.0		)	—		—		(4.0		)
Stock-based compensation and other	—		4.7			(0.1		)	—			4.6			—		—		4.6
Balance at June 30, 2018	$	3.2	$	4,271.0		$	5,449.1		$	2.5		$	9,725.8		$	30.4	$	—	$	9,756.2

The accompanying Notes to Condensed Consolidated Financial Statements are an integral part of these financial statements.

06/30/2019 Form 10-Q 8 WEC Energy Group, Inc.

WEC ENERGY GROUP, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (Unaudited)

June 30, 2019

NOTE 1—GENERAL INFORMATION

WEC Energy Group serves approximately 1.6 million electric customers and 2.9 million natural gas customers, and owns approximately 60% of ATC.

As used in these notes, the term "financial statements" refers to the condensed consolidated financial statements. This includes the income statements, statements of comprehensive income, balance sheets, statements of cash flows, and statements of equity, unless otherwise noted. In this report, when we refer to "the Company," "us," "we," "our," or "ours," we are referring to WEC Energy Group and all of its subsidiaries.

On our financial statements, we consolidate our majority-owned subsidiaries and reflect noncontrolling interests for the portion of entities that we do not own as a component of consolidated equity separate from the equity attributable to our shareholders. The noncontrolling interests that we reported as equity on our balance sheet as of June 30, 2019 related to the minority interests at Bishop Hill III, Coyote Ridge, and Upstream held by third parties. We completed the acquisition of an 80% membership interest in Upstream during January 2019. See Note 2, Acquisitions, for more information.

We use the equity method to account for investments in companies we do not control but over which we exercise significant influence regarding their operating and financial policies. As a result of our limited voting rights, we account for ATC and ATC Holdco as equity method investments. See Note 18, Investment in Transmission Affiliates, for more information.

We have prepared the unaudited interim financial statements presented in this Form 10-Q pursuant to the rules and regulations of the SEC and GAAP. Accordingly, these financial statements do not include all of the information and footnotes required by GAAP for annual financial statements. These financial statements should be read in conjunction with the consolidated financial statements and footnotes in our Annual Report on Form 10-K for the year ended December 31, 2018. Financial results for an interim period may not give a true indication of results for the year. In particular, the results of operations for the three and six months ended June 30, 2019, are not necessarily indicative of expected results for 2019 due to seasonal variations and other factors.

In management's opinion, we have included all adjustments, normal and recurring in nature, necessary for a fair presentation of our financial results.

NOTE 2—ACQUISITIONS

All the acquisitions discussed below were accounted for as asset acquisitions.

Acquisition of a Wind Generation Facility in Nebraska

In January 2019, we completed the acquisition of an 80% membership interest in Upstream, a commercially operational 202.5 MW wind generating facility, for $268.2 million, which included transactions costs and is net of cash and restricted cash acquired of $9.2 million. Upstream is located in Antelope County, Nebraska and supplies energy to the Southwest Power Pool. Upstream's revenue will be substantially fixed over a 10-year period through an agreement with an unaffiliated third party. Under the Tax Legislation, our investment in Upstream qualifies for production tax credits and 100% bonus depreciation. Upstream is included in the non-utility energy infrastructure segment.

Acquisition of a Wind Generation Facility in South Dakota

In December 2018, we acquired an 80% ownership interest in Coyote Ridge, a 97.5 MW wind generating facility under construction in Brookings County, South Dakota, for $61.6 million, which included transaction costs. This wind generating facility is expected to be in service by the end of 2019. Upon completion, we expect our total investment in Coyote Ridge to be $145 million. The project has a 12-year offtake agreement with an unaffiliated third party for all of the energy produced by the facility. Under the Tax Legislation, our investment in Coyote Ridge is expected to qualify for production tax credits and 100% bonus depreciation. We are entitled to 99% of the tax benefits related to this facility for the first 11 years of commercial operation, after which we will be entitled to tax benefits equal to our ownership interest. Coyote Ridge is included in the non-utility energy infrastructure segment.

06/30/2019 Form 10-Q 9 WEC Energy Group, Inc.

Acquisition of a Wind Energy Generation Facility in Illinois

In August 2018, we completed the acquisition of an 80% membership interest in a commercially operational 132 MW wind generating facility located in Henry County, Illinois, known as Bishop Hill III, for $144.7 million, which included transaction costs and was net of restricted cash acquired of $4.5 million. In December 2018, we completed the acquisition of an additional 10% membership interest in Bishop Hill III, for $18.2 million. Bishop Hill III has a 22-year offtake agreement with an unaffiliated third party for all of the energy produced by the facility. Under the Tax Legislation, our investment in Bishop Hill III qualifies for production tax credits and 100% bonus depreciation. Bishop Hill III is included in the non-utility energy infrastructure segment.

Acquisition of a Wind Energy Generation Facility in Wisconsin

In April 2018, WPS, along with two unaffiliated utilities, completed the purchase of Forward Wind Energy Center, which consists of 86 wind turbines located in Wisconsin with a total capacity of 138 MW. The aggregate purchase price was $172.9 million of which WPS’s proportionate share was 44.6%, or $77.1 million. In addition, we incurred transaction costs that are recorded to a regulatory asset. Since 2008 and up until the acquisition, WPS purchased 44.6% of the facility’s energy output under a power purchase agreement.

Under a joint ownership agreement with the two other utilities, WPS is entitled to its share of generating capability and output of the facility equal to its ownership interest. WPS is also paying its ownership share of additional capital expenditures and operating expenses. Forward Wind Energy Center is included in the Wisconsin segment.

NOTE 3—DISPOSITION

Corporate and Other Segment – Sale of Certain WPS Power Development, LLC Solar Power Generation Facilities

In June 2019, we sold three solar power generation facilities owned by PDL for $20.0 million. These solar facilities were located in Massachusetts. During the second quarter of 2019, we recorded an after-tax gain on the sale of $4.9 million primarily related to the recognition of deferred investment tax credits. This was included in income tax expense on our income statements. The assets included in the sale were not material and, therefore, were not presented as held for sale. The results of operations of these facilities remained in continuing operations through the sale date as the sale did not represent a shift in our corporate strategy and did not have a major effect on our operations and financial results.

NOTE 4—OPERATING REVENUES

For more information about our significant accounting policies related to operating revenues, see Note 1(d), Operating Revenues, in our 2018 Annual Report on Form 10-K.

06/30/2019 Form 10-Q 10 WEC Energy Group, Inc.

Disaggregation of Operating Revenues

The following tables present our operating revenues disaggregated by revenue source. We do not have any revenues associated with our electric transmission segment, which includes investments accounted for using the equity method. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. For our segments, revenues are further disaggregated by electric and natural gas operations and then by customer class. Each customer class within our electric and natural gas operations have different expectations of service, energy and demand requirements, and are impacted by regulatory activities within their jurisdictions.

(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended June 30, 2019
Electric	$	1,021.9	$	—	$	—	$	1,021.9	$	—	$	—	$	—		$	1,021.9
Natural gas	227.3		232.8		64.0		524.1		9.8		—		(9.1		)	524.8
Total regulated revenues	1,249.2		232.8		64.0		1,546.0		9.8		—		(9.1		)	1,546.7
Other non-utility revenues	—		—		4.2		4.2		15.3		0.8		(3.1		)	17.2
Total revenues from contracts with customers	1,249.2		232.8		68.2		1,550.2		25.1		0.8		(12.2		)	1,563.9
Other operating revenues	4.1		10.1		0.6		14.8		98.2		0.1		(86.8		)	26.3
Total operating revenues	$	1,253.3	$	242.9	$	68.8	$	1,565.0	$	123.3	$	0.9	$	(99.0	)	$	1,590.2

(in millions)	Wisconsin		Illinois			Other States			Total Utility Operations			Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended June 30, 2018
Electric	$	1,084.2	$	—		$	—		$	1,084.2		$	—	$	—	$	—		$	1,084.2
Natural gas	236.4		273.8			68.9			579.1			10.0		—		(12.7		)	576.4
Total regulated revenues	1,320.6		273.8			68.9			1,663.3			10.0		—		(12.7		)	1,660.6
Other non-utility revenues	—		0.1			3.9			4.0			9.3		2.8		(3.1		)	13.0
Total revenues from contracts with customers	1,320.6		273.9			72.8			1,667.3			19.3		2.8		(15.8		)	1,673.6
Other operating revenues	4.9		(5.9		)	(0.4		)	(1.4		)	97.7		0.3		(97.7		)	(1.1		)
Total operating revenues	$	1,325.5	$	268.0		$	72.4		$	1,665.9		$	117.0	$	3.1	$	(113.5	)	$	1,672.5

(in millions)	Wisconsin		Illinois		Other States			Total Utility Operations		Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended June 30, 2019
Electric	$	2,083.7	$	—	$	—		$	2,083.7	$	—	$	—	$	—		$	2,083.7
Natural gas	792.2		777.4		249.2			1,818.8		26.2		—		(23.8		)	1,821.2
Total regulated revenues	2,875.9		777.4		249.2			3,902.5		26.2		—		(23.8		)	3,904.9
Other non-utility revenues	—		0.1		8.3			8.4		28.6		2.3		(3.8		)	35.5
Total revenues from contracts with customers	2,875.9		777.5		257.5			3,910.9		54.8		2.3		(27.6		)	3,940.4
Other operating revenues	10.8		1.9		(3.5		)	9.2		196.3		0.3		(178.6		)	27.2
Total operating revenues	$	2,886.7	$	779.4	$	254.0		$	3,920.1	$	251.1	$	2.6	$	(206.2	)	$	3,967.6

06/30/2019 Form 10-Q 11 WEC Energy Group, Inc.

(in millions)	Wisconsin		Illinois			Other States			Total Utility Operations			Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended June 30, 2018
Electric	$	2,151.9	$	—		$	—		$	2,151.9		$	—	$	—	$	—		$	2,151.9
Natural gas	754.4		781.4			241.6			1,777.4			24.9		—		(15.2		)	1,787.1
Total regulated revenues	2,906.3		781.4			241.6			3,929.3			24.9		—		(15.2		)	3,939.0
Other non-utility revenues	—		0.1			7.8			7.9			16.4		4.1		(3.8		)	24.6
Total revenues from contracts with customers	2,906.3		781.5			249.4			3,937.2			41.3		4.1		(19.0		)	3,963.6
Other operating revenues	8.3		(6.2		)	(7.1		)	(5.0		)	193.8		0.4		(193.8		)	(4.6		)
Total operating revenues	$	2,914.6	$	775.3		$	242.3		$	3,932.2		$	235.1	$	4.5	$	(212.8	)	$	3,959.0

Revenues from Contracts with Customers

Electric Utility Operating Revenues

The following table disaggregates electric utility operating revenues into customer class:

	Electric Utility Operating Revenues
	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Residential	$	356.7	$	393.7	$	763.4	$	778.0
Small commercial and industrial	331.3		353.3		665.2		684.0
Large commercial and industrial	217.8		241.6		430.1		445.5
Other	7.3		7.2		15.1		14.9
Total retail revenues	913.1		995.8		1,873.8		1,922.4
Wholesale	44.6		58.4		92.3		113.3
Resale	49.4		25.1		90.2		98.9
Steam	4.3		4.5		14.4		14.2
Other utility revenues	10.5		0.4		13.0		3.1
Total electric utility operating revenues	$	1,021.9	$	1,084.2	$	2,083.7	$	2,151.9

Natural Gas Utility Operating Revenues

The following tables disaggregate natural gas utility operating revenues into customer class:

(in millions)	Wisconsin		Illinois			Other States			Total Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2019
Residential	$	126.2	$	154.1		$	39.3		$	319.6
Commercial and industrial	55.8		45.1			20.5			121.4
Total retail revenues	182.0		199.2			59.8			441.0
Transport	16.2		46.8			6.3			69.3
Other utility revenues *	29.1		(13.2		)	(2.1		)	13.8
Total natural gas utility operating revenues	$	227.3	$	232.8		$	64.0		$	524.1

06/30/2019 Form 10-Q 12 WEC Energy Group, Inc.

(in millions)	Wisconsin		Illinois		Other States		Total Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2018
Residential	$	128.1	$	163.7	$	37.9	$	329.7
Commercial and industrial	63.5		47.3		18.7		129.5
Total retail revenues	191.6		211.0		56.6		459.2
Transport	16.4		54.6		6.8		77.8
Other utility revenues *	28.4		8.2		5.5		42.1
Total natural gas utility operating revenues	$	236.4	$	273.8	$	68.9	$	579.1

(in millions)	Wisconsin			Illinois			Other States			Total Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2019
Residential	$	510.1		$	508.1		$	164.5		$	1,182.7
Commercial and industrial	255.5			161.3			92.5			509.3
Total retail revenues	765.6			669.4			257.0			1,692.0
Transport	38.1			134.0			17.4			189.5
Other utility revenues *	(11.5		)	(26.0		)	(25.2		)	(62.7		)
Total natural gas utility operating revenues	$	792.2		$	777.4		$	249.2		$	1,818.8

(in millions)	Wisconsin			Illinois			Other States			Total Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2018
Residential	$	484.8		$	496.3		$	161.1		$	1,142.2
Commercial and industrial	251.4			156.7			83.4			491.5
Total retail revenues	736.2			653.0			244.5			1,633.7
Transport	37.4			132.3			16.7			186.4
Other utility revenues *	(19.2		)	(3.9		)	(19.6		)	(42.7		)
Total natural gas utility operating revenues	$	754.4		$	781.4		$	241.6		$	1,777.4

* Includes amounts collected from (refunded to) customers for purchased gas adjustment costs.

Other Non-Utility Operating Revenues

Other non-utility operating revenues consist primarily of the following:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
We Power revenues	$	6.3	$	6.2	$	12.7	$	12.6
Appliance service revenues	4.2		3.9		8.3		7.8
Distributed renewable solar project revenues	0.8		2.8		2.3		4.1
Wind generation revenues *	5.9		—		12.1		—
Other	—		0.1		0.1		0.1
Total other non-utility operating revenues	$	17.2	$	13.0	$	35.5	$	24.6

* In 2019, we continued to invest in wind generation facilities and recognize revenues from these wind generation facilities as energy is produced and delivered to the customer within the production month.

As part of the construction of the We Power electric generating units, we capitalized interest during construction, which is included in property, plant, and equipment. As allowed by the PSCW, we collected carrying costs from WE's utility customers during construction. The equity portion of these carrying costs was recorded as deferred revenue, net on our balance sheets and we continually amortize this contract liability to revenues over the life of the related lease term that We Power has with WE.

06/30/2019 Form 10-Q 13 WEC Energy Group, Inc.

During the three and six months ended June 30, 2019, we recorded $6.3 million and $12.7 million of revenue, respectively, related to amortization of these deferred carrying costs. During the three and six months ended June 30, 2018, we recorded $6.2 million and $12.6 million of revenue, respectively, related to amortization of these deferred carrying costs.

Other Operating Revenues

Other operating revenues consist primarily of the following:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2019		2018			2019			2018
Alternative revenues *	$	1.1	$	(14.2	)	$	(18.6	)	$	(30.3	)
Late payment charges	12.0		11.1			25.2			22.5
Rental revenues	13.2		2.0			20.6			3.2
Total other operating revenues	$	26.3	$	(1.1	)	$	27.2		$	(4.6	)

* Negative amounts can result from alternative revenues being reversed to revenues from contracts with customers as the customer is billed for these alternative revenues. Negative amounts can also result from revenues to be refunded to customers subject to decoupling mechanisms and wholesale true-ups.

NOTE 5—REGULATORY ASSETS AND LIABILITIES

The following regulatory assets and liabilities were reflected on our balance sheets at June 30, 2019 and December 31, 2018. For more information on our regulatory assets and liabilities, see Note 5, Regulatory Assets and Liabilities, in our 2018 Annual Report on Form 10-K.

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	1,153.3	$	1,193.5
Plant retirements *	1,031.7		832.3
Environmental remediation costs	707.6		687.1
Income tax related items	424.6		369.1
SSR	319.0		316.7
Asset retirement obligations	212.2		185.4
Uncollectible expense	43.6		38.7
We Power generation	38.6		43.0
Electric transmission costs	25.6		58.1
Energy efficiency programs	8.9		14.0
Other, net	70.2		117.9
Total regulatory assets	$	4,035.3	$	3,855.8
Balance sheet presentation
Other current assets	$	28.3	$	50.7
Regulatory assets	4,007.0		3,805.1
Total regulatory assets	$	4,035.3	$	3,855.8

* On March 31, 2019, the PIPP generating units were retired by WE. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP units.

06/30/2019 Form 10-Q 14 WEC Energy Group, Inc.

(in millions)	June 30, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	2,389.6	$	2,406.6
Removal costs	1,304.7		1,329.6
Pension and OPEB costs	231.2		238.3
Mines deferral	130.5		120.8
Energy costs refundable through rate adjustments	90.1		39.6
Decoupling	48.7		30.5
Energy efficiency programs	42.0		31.7
Uncollectible expense	31.9		30.5
Earnings sharing mechanisms	30.0		30.0
Derivatives	17.5		16.4
Other, net	14.2		14.4
Total regulatory liabilities	$	4,330.4	$	4,288.4
Balance sheet presentation
Other current liabilities	$	86.8	$	36.8
Regulatory liabilities	4,243.6		4,251.6
Total regulatory liabilities	$	4,330.4	$	4,288.4

NOTE 6—PROPERTY, PLANT, AND EQUIPMENT

Presque Isle Power Plant

Pursuant to MISO's April 2018 approval of the retirement of the PIPP, these units were retired on March 31, 2019. The carrying value of the PIPP units was $167.2 million at June 30, 2019. This amount included the net book value of $178.5 million, which was classified as a regulatory asset on our balance sheets as a result of the retirement of the plant. In addition, an $11.3 million cost of removal reserve related to the PIPP units remained classified as a regulatory liability at June 30, 2019. After the retirement of the PIPP, a portion of the regulatory asset and related cost of removal reserve was transferred to UMERC for recovery from their retail customers. WE has FERC approval to continue to collect the carrying value of the PIPP units using the approved composite depreciation rates, in addition to a return on the remaining carrying value. However, this approval is subject to refund pending the outcome of settlement procedures. WE and UMERC will amortize the regulatory assets on a straight-line basis using the composite depreciation rates approved by the PSCW before the units were retired.

Severance Liability for Plant Retirements

We have evaluated future plans for our older and less efficient fossil fuel generating units and have retired several plants within the Wisconsin segment. In addition, a severance liability was recorded in other current liabilities on our balance sheets related to these plant retirements.

(in millions)
Severance liability at December 31, 2018	$	15.7
Severance payments	(6.7		)
Other	(3.1		)
Total severance liability at June 30, 2019	$	5.9

06/30/2019 Form 10-Q 15 WEC Energy Group, Inc.

NOTE 7—COMMON EQUITY

Stock-Based Compensation

During the first quarter of 2019, the Compensation Committee of our Board of Directors awarded the following stock-based compensation awards to our directors, officers, and certain other key employees:

Award Type	Number of Awards
Stock options (1)	476,418
Restricted shares (2)	73,571
Performance units	148,036

⁽¹⁾  Stock options awarded had a weighted-average exercise price of $68.18 and a weighted-average grant date fair value of $8.60 per option.

⁽²⁾  Restricted shares awarded had a weighted-average grant date fair value of $68.18 per share.

Restrictions

Our ability as a holding company to pay common stock dividends primarily depends on the availability of funds received from our utility subsidiaries, We Power, and ATC Holding. Various financing arrangements and regulatory requirements impose certain restrictions on the ability of our subsidiaries to transfer funds to us in the form of cash dividends, loans, or advances. All of our utility subsidiaries, with the exception of UMERC and MGU, are prohibited from loaning funds to us, either directly or indirectly. See Note 10, Common Equity, in our 2018 Annual Report on Form 10-K for additional information on these and other restrictions.

We do not believe that these restrictions will materially affect our operations or limit any dividend payments in the foreseeable future.

Common Stock Dividends

On July 18, 2019, our Board of Directors declared a quarterly cash dividend of $0.59 per share, payable on September 1, 2019, to shareholders of record on August 14, 2019.

NOTE 8—SHORT-TERM DEBT AND LINES OF CREDIT

The following table shows our short-term borrowings and their corresponding weighted-average interest rates:

(in millions, except percentages)	June 30, 2019			December 31, 2018
Commercial paper
Amount outstanding	$	1,262.7		$	1,440.1
Weighted-average interest rate on amounts outstanding	2.58		%	2.92		%

Our average amount of commercial paper borrowings based on daily outstanding balances during the six months ended June 30, 2019 was $1,267.3 million with a weighted-average interest rate during the period of 2.76%.

06/30/2019 Form 10-Q 16 WEC Energy Group, Inc.

The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including available capacity under these facilities:

(in millions)	Maturity	June 30, 2019
WEC Energy Group	October 2022	$	1,200.0
WE	October 2022	500.0
WPS	October 2022	400.0
WG	October 2022	350.0
PGL	October 2022	350.0
Total short-term credit capacity		$	2,800.0
Less:
Letters of credit issued inside credit facilities		$	2.5
Commercial paper outstanding		1,262.7
Available capacity under existing agreements		$	1,534.8

NOTE 9—LONG-TERM DEBT

WEC Energy Group, Inc.

In March 2019, we issued $350.0 million of 3.10% Senior Notes due March 8, 2022. We used the net proceeds to repay short-term debt, and for working capital and other general corporate purposes.

ATC Holding LLC

In July 2019, ATC Holding secured commitments for $235.0 million of 3.75% Senior Notes due September 16, 2029. ATC Holding expects to issue the Senior Notes in September 2019. The net proceeds are expected to be used to make a special distribution to WEC Energy Group in order to balance ATC Holding’s capital structure.

NOTE 10—LEASES

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which revised the previous guidance (Topic 840) regarding accounting for leases. Revisions include requiring a lessee to recognize a lease asset and a lease liability on its balance sheet for each lease, including operating leases with an initial term greater than 12 months. In addition, required quantitative and qualitative disclosures related to lease agreements were expanded.

As required, we adopted Topic 842 effective January 1, 2019. We utilized the following practical expedients, which were available under ASU 2016-02, in our adoption of the new lease guidance.

• We did not reassess whether any expired or existing contracts were leases or contained leases.

• We did not reassess the lease classification for any expired or existing leases (that is, all leases that were classified as operating leases in accordance with Topic 840 continue to be classified as operating leases, and all leases that were classified as capital leases in accordance with Topic 840 are classified as finance leases).

• We did not reassess the accounting for initial direct costs for any existing leases.

We did not elect the practical expedient allowing entities to account for the nonlease components in lease contracts as part of the single lease component to which they were related. Instead, in accordance with Accounting Standards Codification 842-10-15-31, our policy is to account for each lease component separately from the nonlease components of the contract.

We did not elect the practical expedient to use hindsight in determining the lease term and in assessing impairment of our right of use assets. No impairment losses were included in the measurement of our right of use assets upon our adoption of Topic 842.

In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842, which is an amendment to ASU 2016-02. Land easements (also commonly referred to as rights of way) represent the right to use, access or cross another entity's land for a specified purpose. This new guidance permits an entity to elect a transitional practical expedient, to be applied consistently, to not evaluate under Topic 842 land easements that were already in existence or had expired at the time of the entity's adoption of Topic 842. Once Topic 842 is adopted, an entity is required to apply Topic 842 prospectively to

06/30/2019 Form 10-Q 17 WEC Energy Group, Inc.

all new (or modified) land easements to determine whether the arrangement should be accounted for as a lease. We elected this practical expedient, resulting in none of our land easements being treated as leases upon our adoption of Topic 842.

In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements, which amends ASU 2016-02 and allows entities the option to initially apply Topic 842 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption, if required. We used the optional transition method to apply the new guidance as of January 1, 2019, rather than as of the earliest period presented. We did not require a cumulative-effect adjustment upon adoption of Topic 842.

Right of use assets and related lease liabilities related to our operating leases that were recorded upon adoption of Topic 842 were $49.0 million and $48.8 million, respectively. Regarding our finance lease, while the adoption of Topic 842 changed the classification of expense related to this lease on a prospective basis, it had no impact on the total amount of lease expense recorded, and did not impact the lease asset and related liability amounts recorded on our balance sheets.

Obligations Under Operating Leases

We have recorded right of use assets and lease liabilities associated with the following operating leases.

• Leases of office space, primarily related to several floors we are leasing in the Aon Center office building in Chicago, Illinois, through April 2029.

• Land we are leasing related to our Rothschild biomass plant through June 2051, and also a land lease related to a non-utility solar facility through December 2034.

• Rail cars we are leasing to transport coal to various generating facilities through February 2021.

The operating leases generally require us to pay property taxes, insurance premiums, and operating and maintenance costs associated with the leased property. Many of our leases contain options to renew past the initial term, as set forth in the lease agreement.

Obligations Under Finance Lease

In 1997, we entered into a 25-year power purchase contract with an unaffiliated independent power producer. The contract, for 236 MWs of firm capacity from a natural gas-fired cogeneration facility, includes zero minimum energy requirements. When the contract expires in 2022, we may, at our option and with proper notice, renew for another ten years, purchase the generating facility at fair market value, or allow the contract to expire. We originally recorded this leased facility and corresponding obligation on our balance sheets at the estimated fair value of the plant's electric generating facilities. Minimum lease payments are a function of the 236 MWs of firm capacity we receive from the plant and the fixed monthly capacity rate published in the lease.

Prior to our adoption of Topic 842 on January 1, 2019, we accounted for this finance lease under Topic 980-840, Regulated Operations – Leases, as follows:

• We recorded our minimum lease payments as purchased power expense on our income statement.

• We recorded the difference between the minimum lease payments and the sum of imputed interest and amortization costs calculated under finance lease accounting rules as a deferred regulatory asset on our balance sheets.

In conjunction with our adoption of Topic 842, while the timing of expense recognition related to this finance lease did not change, classification of the lease expense changed as follows:

• Effective January 1, 2019, the minimum lease payments under the power purchase contract were no longer classified within purchased power expense, but were instead recorded as a component of depreciation and amortization and interest expense in accordance with Topic 980-842, Regulated Operations – Leases.

• In order to ensure the timing of lease expense did not change for this finance lease upon adoption of Topic 842, and still resembled the expense recognition pattern of an operating lease, in accordance with Topic 980-842 the amortization of the right of use assets was modified from what would typically be recorded for a finance lease under Topic 842.

• We continue to record the difference between the minimum lease payments and the sum of imputed interest and unadjusted amortization costs calculated under the finance lease accounting rules as a deferred regulatory asset on our balance sheets.

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Due to the timing and the amounts of the minimum lease payments, the regulatory asset increased to $78.5 million in 2009, at which time the regulatory asset began to be reduced to zero over the remaining life of the contract. The total obligation under the finance lease was $21.0 million at June 30, 2019, and will decrease to zero over the remaining life of the contract.

Amounts Recognized in the Financial Statements

The components of lease expense and supplemental cash flow information related to our leases for the three and six months ended June 30 are as follows:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019			2018
Finance/capital lease expense (1)	$	2.1	$	1.9	$	4.1		$	3.8
Operating lease expense (2)	1.4		1.4		2.8			2.8
Short-term lease expense (2)	0.1		0.6		0.1			0.7
Total lease expense	$	3.6	$	3.9	$	7.0		$	7.3
Other information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for finance/capital lease (3)					$	1.8		$	3.8
Operating cash flows for operating leases					$	3.2		$	3.3
Financing cash flows for finance lease (3)					$	2.3		$	—
Non-cash activity – right of use assets obtained in exchange for operating lease liabilities					$	49.0
Remaining lease term – finance lease					2.9 years
Weighted-average remaining lease term – operating leases					13.1 years
Discount rate – finance lease (4)					15.8		%
Weighted average discount rate – operating leases (4)					4.4		%

⁽¹⁾  For the three and six months ended June 30, 2019, finance lease expense included amortization of right of use assets in the amount of $1.2 million and $2.3 million (included in depreciation and amortization expense), respectively and interest on lease liabilities of $0.9 million and $1.8 million (included in interest expense), respectively. For each of the three and six months ended June 30, 2018, total finance lease expense related to the long-term power purchase agreement was included in cost of sales.

⁽²⁾  Operating and short-term lease expense were included as a component of operation and maintenance for the three and six months ended June 30, 2019 and 2018.

⁽³⁾  Prior to our adoption of Topic 842 on January 1, 2019, all cash flows related to the finance lease were recorded as a component of operating cash flows.

⁽⁴⁾  Because our operating leases do not provide an implicit rate of return, we used the fully collateralized incremental borrowing rates based upon information available for similarly rated companies in determining the present value of lease payments for our operating leases. For our financing lease, the rate implicit in the lease was readily determinable.

The following table summarizes our finance lease right of use asset, which was included in property, plant and equipment on our balance sheets:

(in millions)	June 30, 2019			December 31, 2018
Long-term power purchase commitment	$	140.3		$	140.3
Accumulated amortization	(123.7		)	(120.9		)
Total finance lease right of use asset/capital lease asset	$	16.6		$	19.4

Right of use assets related to operating leases were $44.7 million at June 30, 2019, and were included in other long-term assets on our balance sheets.

06/30/2019 Form 10-Q 19 WEC Energy Group, Inc.

Future minimum lease payments under our operating leases and our finance lease, and the present value of our net minimum lease payments as of June 30, 2019, were as follows:

(in millions)	Total Operating Leases			Power Purchase Commitment
Six months ending December 31, 2019	$	2.7		$	4.1
2020	6.9			8.8
2021	4.9			9.4
2022	4.9			4.2
2023	5.0			—
2024	4.8			—
Thereafter	30.5			—
Total minimum lease payments	59.7			26.5
Less: Interest	(15.3		)	(5.5		)
Present value of minimum lease payments	44.4			21.0
Less: Short-term lease liabilities	(4.3		)	(5.6		)
Long-term lease liabilities	$	40.1		$	15.4

Short-term and long-term lease liabilities related to operating leases were included in other current liabilities and other long-term liabilities on the balance sheets, respectively.

At December 31, 2018, short-term and long-term liabilities under our capital lease were $4.9 million and $18.4 million, respectively. Short-term and long-term lease liabilities related to our finance/capital lease were included in current portion of long-term debt and long-term debt on the balance sheets, respectively.

Significant Judgments and Other Information

We are currently party to several easement agreements that allow us access to land we do not own for the purpose of constructing and maintaining certain electric power and natural gas equipment. The majority of payments we make related to easements relate to our wind farms. We have not classified our easements as leases because we view the entire parcel of land specified in our easement agreements to be the identified asset, not just that portion of the parcel that contains our easement. As such, we have concluded that we do not control the use of an identified asset related to our easement agreements, nor do we obtain substantially all of the economic benefits associated with these shared-use assets.

Related to our investment in the Two Creeks Solar Project, WPS, along with an unaffiliated utility, entered into several land leases in Manitowoc County, Wisconsin that commenced in the third quarter of 2019. The leases with unaffiliated parties are for a total of approximately 600 acres of land. Each lease has an initial term of 30 years with two optional 10-year extensions.

NOTE 11—MATERIALS, SUPPLIES, AND INVENTORIES

Our inventory consisted of:

(in millions)	June 30, 2019		December 31, 2018
Materials and supplies	$	236.0	$	226.6
Natural gas in storage	130.5		232.9
Fossil fuel	94.9		88.7
Total	$	461.4	$	548.2

PGL and NSG price natural gas storage injections at the calendar year average of the costs of natural gas supply purchased. Withdrawals from storage are priced on the LIFO cost method. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of natural gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation debit or credit. At June 30, 2019, we had a temporary LIFO liquidation debit of $2.9 million recorded within other current assets on our balance sheet. Due to seasonality requirements, PGL and NSG expect these interim reductions in LIFO layers to be replenished by year end.

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Substantially all other materials and supplies, natural gas in storage, and fossil fuel inventories are recorded using the weighted-average cost method of accounting.

NOTE 12—INCOME TAXES

The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:

	Three Months Ended June 30, 2019					Three Months Ended June 30, 2018
(in millions)	Amount			Effective Tax Rate		Amount			Effective Tax Rate
Statutory federal income tax	$	52.7		21.0	%	$	59.2		21.0	%
State income taxes net of federal tax benefit	15.6			6.2	%	17.7			6.3	%
Tax repairs	(30.4		)	(12.1	)%	(22.5		)	(8.0	)%
Federal excess deferred tax amortization	(7.5		)	(3.0	)%	1.5			0.5	%
Wind production tax credits	(6.2		)	(2.5	)%	(2.1		)	(0.7	)%
Excess tax benefits – stock options	(4.4		)	(1.7	)%	(1.0		)	(0.3	)%
Other	(4.6		)	(1.8	)%	(1.7		)	(0.7	)%
Total income tax expense	$	15.2		6.1	%	$	51.1		18.1	%

	Six Months Ended June 30, 2019					Six Months Ended June 30, 2018
(in millions)	Amount			Effective Tax Rate		Amount			Effective Tax Rate
Statutory federal income tax	$	154.6		21.0	%	$	159.7		21.0	%
State income taxes net of federal tax benefit	46.5			6.3	%	47.6			6.3	%
Tax repairs	(60.0		)	(8.1	)%	(48.0		)	(6.3	)%
Federal excess deferred tax amortization	(20.7		)	(2.8	)%	(14.0		)	(1.8	)%
Wind production tax credits	(19.6		)	(2.7	)%	(5.9		)	(0.8	)%
Excess tax benefits – stock options	(11.6		)	(1.6	)%	(1.9		)	(0.3	)%
Other	(9.0		)	(1.2	)%	1.9			0.2	%
Total income tax expense	$	80.2		10.9	%	$	139.4		18.3	%

The effective tax rates of 6.1% and 10.9% for the three and six months ended June 30, 2019, respectively, differ from the United States statutory federal income tax rate of 21%, primarily due to the flow through of tax repairs in connection with the Wisconsin rate settlement, the impact of the Tax Legislation, and wind production tax credits generated from recent acquisitions of wind generation facilities in our non-utility energy infrastructure segment, partially offset by state income taxes.

The effective tax rates of 18.1% and 18.3% for the three and six months ended June 30, 2018, respectively, differ from the United States statutory federal income tax rate of 21%, primarily due to the flow through of tax repairs in connection with the Wisconsin rate settlement and the impact of the Tax Legislation, partially offset by state income taxes.

The Tax Legislation, signed into law in December 2017, required our regulated utilities to remeasure their deferred income taxes and we began to amortize the resulting excess deferred income taxes beginning in 2018 in accordance with normalization requirements (see federal excess deferred tax amortization line above). See Note 23, Regulatory Environment, for more information about the Wisconsin rate settlement.

NOTE 13—FAIR VALUE MEASUREMENTS

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price).

Fair value accounting rules provide a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

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Level 2 – Pricing inputs are observable, either directly or indirectly, but are not quoted prices included within Level 1. Level 2 includes those financial instruments that are valued using external inputs within models or other valuation methods.

Level 3 – Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methods that result in management's best estimate of fair value. Level 3 instruments include those that may be more structured or otherwise tailored to customers' needs.

Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. We use a mid-market pricing convention (the mid-point between bid and ask prices) as a practical measure for valuing certain derivative assets and liabilities. We primarily use a market approach for recurring fair value measurements and attempt to use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs.

When possible, we base the valuations of our financial assets and liabilities on quoted prices for identical assets and liabilities in active markets. These valuations are classified in Level 1. The valuations of certain contracts not classified as Level 1 may be based on quoted market prices received from counterparties and/or observable inputs for similar instruments. Transactions valued using these inputs are classified in Level 2. Certain derivatives are categorized in Level 3 due to the significance of unobservable or internally-developed inputs.

We recognize transfers between levels of the fair value hierarchy at their value as of the end of the reporting period.

The following tables summarize our financial assets and liabilities that were accounted for at fair value on a recurring basis, categorized by level within the fair value hierarchy:

	June 30, 2019
(in millions)	Level 1		Level 2		Level 3		Total
Derivative assets
Natural gas contracts	$	2.6	$	2.0	$	—	$	4.6
FTRs	—		—		10.4		10.4
Coal contracts	—		0.8		—		0.8
Total derivative assets	$	2.6	$	2.8	$	10.4	$	15.8
Investments held in rabbi trust	$	77.1	$	—	$	—	$	77.1
Derivative liabilities
Natural gas contracts	$	23.8	$	0.5	$	—	$	24.3
Coal contracts	—		0.1		—		0.1
Interest rate swaps	—		6.7		—		6.7
Total derivative liabilities	$	23.8	$	7.3	$	—	$	31.1

	December 31, 2018
(in millions)	Level 1		Level 2		Level 3		Total
Derivative assets
Natural gas contracts	$	6.3	$	1.8	$	—	$	8.1
FTRs	—		—		7.4		7.4
Coal contracts	—		0.4		—		0.4
Total derivative assets	$	6.3	$	2.2	$	7.4	$	15.9
Investments held in rabbi trust	$	65.0	$	—	$	—	$	65.0
Derivative liabilities
Natural gas contracts	$	4.7	$	0.8	$	—	$	5.5
Coal contracts	—		0.1		—		0.1
Interest rate swaps	—		2.3		—		2.3
Total derivative liabilities	$	4.7	$	3.2	$	—	$	7.9

06/30/2019 Form 10-Q 22 WEC Energy Group, Inc.

The derivative assets and liabilities listed in the tables above include options, swaps, futures, physical commodity contracts, and other instruments used to manage market risks related to changes in commodity prices and interest rates. They also include FTRs, which are used to manage electric transmission congestion costs in the MISO Energy and Operating Reserves Markets.

We hold investments in the Integrys rabbi trust. These investments are restricted as they can only be withdrawn from the trust to fund participants' benefits under the Integrys deferred compensation plan and certain Integrys non-qualified pension plans. These investments are included in other long-term assets on our balance sheets. For the three months ended June 30, 2019 and 2018, the net unrealized gains included in earnings related to the investments held at the end of the period were $2.8 million and $3.5 million, respectively. For the six months ended June 30, 2019 and 2018, the net unrealized gains included in earnings related to the investments held at the end of the period were $11.4 million and $0.4 million, respectively.

The following table summarizes the changes to derivatives classified as Level 3 in the fair value hierarchy:

	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Balance at the beginning of the period	$	3.1		$	1.5		$	7.4		$	4.4
Purchases	12.8			18.4			12.8			18.4
Settlements	(5.5		)	(3.2		)	(9.8		)	(6.1		)
Balance at the end of the period	$	10.4		$	16.7		$	10.4		$	16.7

Fair Value of Financial Instruments

The following table shows the financial instruments included on our balance sheets that were not recorded at fair value:

	June 30, 2019				December 31, 2018
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Preferred stock of subsidiary	$	30.4	$	28.2	$	30.4	$	28.3
Long-term debt, including current portion *	10,666.5		11,543.4		10,335.7		10,554.9

* The carrying amount of long-term debt excludes finance and capital lease obligations of $21.0 million and $23.3 million at June 30, 2019 and December 31, 2018, respectively.

The fair values of our long-term debt and preferred stock are categorized within Level 2 of the fair value hierarchy.

NOTE 14—DERIVATIVE INSTRUMENTS

We use derivatives as part of our risk management program to manage the risks associated with the price volatility of interest rates, purchased power, generation, and natural gas costs for the benefit of our customers and shareholders. Our approach is non-speculative and designed to mitigate risk. Regulated hedging programs are approved by our state regulators.

We record derivative instruments on our balance sheets as an asset or liability measured at fair value unless they qualify for the normal purchases and sales exception and are so designated. We continually assess our contracts designated as normal and will discontinue the treatment of these contracts as normal if the required criteria are no longer met. Changes in the derivative's fair value are recognized currently in earnings unless specific hedge accounting criteria are met or we receive regulatory treatment for the derivative. For most energy-related physical and financial contracts in our regulated operations that qualify as derivatives, our regulators allow the effects of fair value accounting to be offset to regulatory assets and liabilities.

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None of our derivatives are designated as hedging instruments, with the exception of our interest rate swaps, which have been designated as cash flow hedges. The following table shows our derivative assets and derivative liabilities:

	June 30, 2019				December 31, 2018
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
Other current
Natural gas contracts	$	4.6	$	22.5	$	7.7	$	5.3
FTRs	10.4		—		7.4		—
Coal contracts	0.5		0.1		0.2		0.1
Interest rate swaps	—		1.9		—		0.4
Total other current *	$	15.5	$	24.5	$	15.3	$	5.8
Other long-term
Natural gas contracts	$	—	$	1.8	$	0.4	$	0.2
Coal contracts	0.3		—		0.2		—
Interest rate swaps	—		4.8		—		1.9
Total other long-term *	$	0.3	$	6.6	$	0.6	$	2.1
Total	$	15.8	$	31.1	$	15.9	$	7.9

* On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.

Realized gains (losses) on derivatives not designated as hedging instruments are primarily recorded in cost of sales on the income statements. Our estimated notional sales volumes and realized gains (losses) were as follows:

	Three Months Ended June 30, 2019				Three Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	43.8 Dth	$	(3.1	)	39.9 Dth	$	(2.3	)
Petroleum products contracts	— gallons	—			1.7 gallons	0.3
FTRs	8.0 MWh	3.0			6.8 MWh	3.9
Total		$	(0.1	)		$	1.9

	Six Months Ended June 30, 2019				Six Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	99.9 Dth	$	(3.6	)	88.0 Dth	$	(7.5	)
Petroleum products contracts	— gallons	—			3.8 gallons	0.8
FTRs	16.1 MWh	5.3			15.0 MWh	7.6
Total		$	1.7			$	0.9

On our balance sheets, the amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against the fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. At June 30, 2019 and December 31, 2018, we had posted cash collateral of $30.2 million and $2.7 million, respectively, in our margin accounts. These amounts were recorded on our balance sheets in other current assets. At December 31, 2018, we had also received cash collateral of $0.2 million in our margin accounts. This amount was recorded on our balance sheet in other current liabilities. We had not received any cash collateral at June 30, 2019.

06/30/2019 Form 10-Q 24 WEC Energy Group, Inc.

The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:

	June 30, 2019							December 31, 2018
(in millions)	Derivative Assets			Derivative Liabilities				Derivative Assets				Derivative Liabilities
Gross amount recognized on the balance sheet	$	15.8		$	31.1			$	15.9			$	7.9
Gross amount not offset on the balance sheet	(3.0		)	(24.2		)	(1)	(4.0		)	(2)	(4.9		)	(3)
Net amount	$	12.8		$	6.9			$	11.9			$	3.0

⁽¹⁾   Includes cash collateral posted of $21.2 million.

⁽²⁾   Includes cash collateral received of $0.2 million.

⁽³⁾   Includes cash collateral posted of $1.1 million.

Cash Flow Hedges

Effective January 1, 2019, we adopted ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. The amendments in this update expand the strategies that qualify for hedge accounting, amend the presentation and disclosure requirements related to hedging activities, and provide overall targeted improvements to simplify hedge accounting in certain situations. The adoption of this standard did not have a significant impact on our financial statements.

As of June 30, 2019, we had two interest rate swaps with a combined notional value of $250.0 million to hedge the variable interest rate risk associated with our 2007 Junior Notes. The swaps provide a fixed interest rate of 4.9765% on $250.0 million of the $500.0 million of outstanding 2007 Junior Notes through November 15, 2021. As these swaps qualified for cash flow hedge accounting treatment, the related gains and losses are being deferred in accumulated other comprehensive loss and are being amortized to interest expense as interest is accrued on the 2007 Junior Notes.

We previously entered into forward interest rate swap agreements to mitigate the interest rate exposure associated with the issuance of long-term debt related to the acquisition of Integrys. These swap agreements were settled in 2015, and we continue to amortize amounts out of accumulated other comprehensive loss into interest expense over the periods in which the interest costs are recognized in earnings.

The table below shows the amounts related to these cash flow hedges recorded in other comprehensive loss and in earnings, along with our total interest expense on the income statements:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2019			2018		2019			2018
Derivative losses recognized in other comprehensive loss	$	(3.2	)	$	—	$	(4.8	)	$	—
Net derivative gains reclassified from accumulated other comprehensive loss to interest expense	0.4			0.5		0.8			1.1
Total interest expense line item on the income statements	124.1			108.5		248.5			215.2

We estimate that during the next twelve months $0.3 million will be reclassified from accumulated other comprehensive loss as a reduction to interest expense.

06/30/2019 Form 10-Q 25 WEC Energy Group, Inc.

NOTE 15—GUARANTEES

The following table shows our outstanding guarantees:

			Expiration
(in millions)	Total Amounts Committed at June 30, 2019		Less Than 1 Year		1 to 3 Years		Over 3 Years
Guarantees
Guarantees supporting commodity transactions of subsidiaries (1)	$	6.7	$	6.7	$	—	$	—
Standby letters of credit (2)	101.3		1.0		0.2		100.1
Surety bonds (3)	9.7		9.6		0.1		—
Other guarantees (4)	10.4		—		0.9		9.5
Total guarantees	$	128.1	$	17.3	$	1.2	$	109.6

⁽¹⁾  Includes $2.7 million and $4.0 million to support the business operations of Bluewater and UMERC, respectively.

⁽²⁾  At our request or the request of our subsidiaries, financial institutions have issued standby letters of credit for the benefit of third parties that have extended credit to our subsidiaries. These amounts are not reflected on our balance sheets.

⁽³⁾  Primarily for workers compensation self-insurance programs and obtaining various licenses, permits, and rights-of-way. These amounts are not reflected on our balance sheets.

⁽⁴⁾  Consists of $10.4 million related to other indemnifications, for which a liability of $9.5 million related to workers compensation coverage was recorded on our balance sheets.

NOTE 16—EMPLOYEE BENEFITS

The following tables show the components of net periodic pension and OPEB costs for our benefit plans.

	Pension Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	11.8		$	11.8		$	23.1		$	23.8
Interest cost	30.2			28.7			60.8			57.0
Expected return on plan assets	(48.2		)	(48.8		)	(96.9		)	(98.4		)
Loss on plan settlement	1.0			0.3			1.8			0.7
Amortization of prior service cost	0.5			0.6			1.1			1.3
Amortization of net actuarial loss	18.7			23.9			37.7			47.0
Net periodic benefit cost	$	14.0		$	16.5		$	27.6		$	31.4

	OPEB Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	3.8		$	5.6		$	8.2		$	11.8
Interest cost	6.3			7.4			12.8			14.9
Expected return on plan assets	(13.6		)	(14.8		)	(27.3		)	(29.7		)
Amortization of prior service credit	(3.8		)	(3.9		)	(7.7		)	(7.7		)
Amortization of net actuarial (gain) loss	(2.0		)	0.2			(2.7		)	0.5
Net periodic benefit credit	$	(9.3	)	$	(5.5	)	$	(16.7	)	$	(10.2	)

During the six months ended June 30, 2019, we made contributions and payments of $6.9 million related to our pension plans and $1.4 million related to our OPEB plans. We expect to make contributions and payments of $4.9 million related to our pension plans and $5.3 million related to our OPEB plans during the remainder of 2019, dependent upon various factors affecting us, including our liquidity position and the effects of the Tax Legislation.

06/30/2019 Form 10-Q 26 WEC Energy Group, Inc.

NOTE 17—GOODWILL

Goodwill represents the excess of the cost of an acquisition over the fair value of the identifiable net assets acquired. The table below shows our goodwill balances by segment for the six months ended June 30, 2019. We had no changes to the carrying amount of goodwill during the six months ended June 30, 2019.

(in millions)	Wisconsin		Illinois		Other States		Non-Utility Energy Infrastructure		Total
Goodwill balance *	$	2,104.3	$	758.7	$	183.2	$	6.6	$	3,052.8

* We had no accumulated impairment losses related to our goodwill as of June 30, 2019.

NOTE 18—INVESTMENT IN TRANSMISSION AFFILIATES

We own approximately 60% of ATC, a for-profit, transmission-only company regulated by the FERC for cost of service and certain state regulatory commissions for routing and siting of transmission projects. We also own approximately 75% of ATC Holdco, a separate entity formed in December 2016 to invest in transmission-related projects outside of ATC's traditional footprint. The following tables provide a reconciliation of the changes in our investments in ATC and ATC Holdco:

	Three Months Ended June 30, 2019
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,630.6	$	40.0		$	1,670.6
Add: Earnings (loss) from equity method investment	37.4		(0.5		)	36.9
Add: Capital contributions	18.1		0.4			18.5
Less: Distributions	29.4		—			29.4
Less: Other	0.1		—			0.1
Balance at end of period	$	1,656.6	$	39.9		$	1,696.5

	Three Months Ended June 30, 2018
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,561.1	$	37.8		$	1,598.9
Add: Earnings (loss) from equity method investment	29.8		(1.1		)	28.7
Add: Capital contributions	18.1		1.5			19.6
Less: Distributions	50.7		—			50.7
Add: Other	0.1		—			0.1
Balance at end of period	$	1,558.4	$	38.2		$	1,596.6

	Six Months Ended June 30, 2019
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,625.3	$	40.0		$	1,665.3
Add: Earnings (loss) from equity method investment	73.9		(0.9		)	73.0
Add: Capital contributions	21.1		0.8			21.9
Less: Distributions	63.6		—			63.6
Less: Other	0.1		—			0.1
Balance at end of period	$	1,656.6	$	39.9		$	1,696.5

06/30/2019 Form 10-Q 27 WEC Energy Group, Inc.

	Six Months Ended June 30, 2018
(in millions)	ATC			ATC Holdco			Total
Balance at beginning of period	$	1,515.8	(1)	$	37.6		$	1,553.4
Add: Earnings (loss) from equity method investment	63.2			(1.7		)	61.5
Add: Capital contributions	30.1			2.3			32.4
Less: Distributions	50.7		(2)	—			50.7
Balance at end of period	$	1,558.4		$	38.2		$	1,596.6

⁽¹⁾  Distributions of $39.9 million, received in the first quarter of 2018, were approved and recorded as a receivable from ATC in other current assets at December 31, 2017.

⁽²⁾  Distributions of $24.2 million, received in the third quarter of 2018, were approved and recorded as a receivable from ATC in accounts receivable at June 30, 2018.

We pay ATC for network transmission and other related services it provides. In addition, we provide a variety of operational, maintenance, and project management work for ATC, which is reimbursed by ATC. We are required to pay the cost of needed transmission infrastructure upgrades for new generation projects while the projects are under construction. ATC reimburses us for these costs when the new generation is placed in service.

The following table summarizes our significant related party transactions with ATC:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Charges to ATC for services and construction	$	3.3	$	4.1	$	7.3	$	8.7
Charges from ATC for network transmission services	87.0		84.6		174.1		169.1
Refund from ATC related to a FERC audit	—		22.0		—		22.0

Our balance sheets included the following receivables and payables for services received from or provided to ATC:

(in millions)	June 30, 2019		December 31, 2018
Accounts receivable for services provided to ATC	$	2.3	$	3.4
Accounts payable for services received from ATC	29.0		28.2
Amounts due from ATC for transmission infrastructure upgrades*	—		29.4

* In connection with UMERC's construction of the new natural gas-fired generation in the Upper Peninsula of Michigan, UMERC was required to initially fund the construction of the transmission infrastructure upgrades owned by ATC that are needed for the new generation. In the second quarter of 2019, ATC fully reimbursed UMERC for these costs.

Summarized financial data for ATC is included in the following tables:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Income statement data
Operating revenues	$	182.2	$	165.5	$	359.9	$	330.9
Operating expenses	93.6		91.5		184.0		176.4
Other expense, net	28.6		25.4		57.4		53.0
Net income	$	60.0	$	48.6	$	118.5	$	101.5

06/30/2019 Form 10-Q 28 WEC Energy Group, Inc.

(in millions)	June 30, 2019		December 31, 2018
Balance sheet data
Current assets	$	88.8	$	87.2
Noncurrent assets	5,100.7		4,928.8
Total assets	$	5,189.5	$	5,016.0
Current liabilities	$	562.1	$	640.0
Long-term debt	2,213.0		2,014.0
Other noncurrent liabilities	294.4		295.3
Shareholders' equity	2,120.0		2,066.7
Total liabilities and shareholders' equity	$	5,189.5	$	5,016.0

NOTE 19—SEGMENT INFORMATION

We use operating income to measure segment profitability and to allocate resources to our businesses. At June 30, 2019, we reported six segments, which are described below.

• The Wisconsin segment includes the electric and natural gas utility operations of WE, WG, WPS, and UMERC.

• The Illinois segment includes the natural gas utility and non-utility operations of PGL and NSG.

• The other states segment includes the natural gas utility and non-utility operations of MERC and MGU.

• The electric transmission segment includes our approximate 60% ownership interest in ATC, a for-profit, transmission-only company regulated by the FERC for cost of service and certain state regulatory commissions for routing and siting of transmission projects, and our approximate 75% ownership interest in ATC Holdco, which invests in transmission-related projects outside of ATC's traditional footprint.

• The non-utility energy infrastructure segment includes:

◦ We Power, which owns and leases generating facilities to WE,

◦ Bluewater, which owns underground natural gas storage facilities in Michigan that provide approximately one-third of the current storage needs for our Wisconsin natural gas utilities,

◦ Our 90% membership interest in Bishop Hill III, a wind generating facility located in Henry County, Illinois,

◦ Our 80% membership interest in Coyote Ridge, a wind generating facility under construction in Brookings County, South Dakota, and

◦ Our 80% membership interest in Upstream, a wind generating facility located in Antelope County, Nebraska.

See Note 2, Acquisitions, for more information on Bishop Hill III, Coyote Ridge, and Upstream.

• The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the Peoples Energy, LLC holding company, Wispark LLC, Wisvest LLC, Wisconsin Energy Capital Corporation, WEC Business Services LLC, and PDL.

06/30/2019 Form 10-Q 29 WEC Energy Group, Inc.

All of our operations are located within the United States. The following tables show summarized financial information related to our reportable segments for the three and six months ended June 30, 2019 and 2018:

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
June 30, 2019
External revenues	$	1,253.3	$	242.9	$	68.8	$	1,565.0	$	—	$	24.3	$	0.9		$	—		$	1,590.2
Intersegment revenues	—		—		—		—		—		99.0		—			(99.0		)	—
Other operation and maintenance	363.9		107.0		23.4		494.3		—		6.8		1.8			0.7			503.6
Depreciation and amortization	152.9		45.0		6.7		204.6		—		22.9		6.0			(3.6		)	229.9
Operating income (loss)	270.2		42.6		4.6		317.4		—		91.3		(7.1		)	(87.0		)	314.6
Equity in earnings of transmission affiliates	—		—		—		—		36.9		—		—			—			36.9
Interest expense	142.7		13.9		1.9		158.5		2.7		15.5		36.5			(89.1		)	124.1

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
June 30, 2018
External revenues	$	1,325.5	$	268.0	$	72.4	$	1,665.9	$	—	$	3.5	$	3.1		$	—		$	1,672.5
Intersegment revenues	—		—		—		—		—		113.5		—			(113.5		)	—
Other operation and maintenance	502.4		104.1		24.9		631.4		—		4.5		2.2			(100.4		)	537.7
Depreciation and amortization	134.6		41.8		4.5		180.9		—		18.3		7.5			—			206.7
Operating income (loss)	195.1		41.7		8.1		244.9		—		92.4		(6.5		)	—			330.8
Equity in earnings of transmission affiliates	—		—		—		—		28.7		—		—			—			28.7
Interest expense	48.5		12.3		2.1		62.9		—		16.0		30.3			(0.7		)	108.5

06/30/2019 Form 10-Q 30 WEC Energy Group, Inc.

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended
June 30, 2019
External revenues	$	2,886.7	$	779.4	$	254.0	$	3,920.1	$	—	$	44.9	$	2.6		$	—		$	3,967.6
Intersegment revenues	—		—		—		—		—		206.2		—			(206.2		)	—
Other operation and maintenance	756.6		235.2		51.0		1,042.8		—		10.6		0.8			—			1,054.2
Depreciation and amortization	303.9		89.5		13.2		406.6		—		45.5		12.4			(8.2		)	456.3
Operating income (loss)	632.0		180.5		46.1		858.6		—		184.0		(11.0		)	(174.2		)	857.4
Equity in earnings of transmission affiliates	—		—		—		—		73.0		—		—			—			73.0
Interest expense	286.1		28.7		4.2		319.0		5.3		31.2		71.6			(178.6		)	248.5

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended
June 30, 2018
External revenues	$	2,914.6	$	775.3	$	242.3	$	3,932.2	$	—	$	22.3	$	4.5		$	—		$	3,959.0
Intersegment revenues	—		—		—		—		—		212.8		—			(212.8		)	—
Other operation and maintenance	970.9		216.3		51.5		1,238.7		—		6.2		1.9			(197.2		)	1,049.6
Depreciation and amortization	269.7		82.7		11.1		363.5		—		36.6		15.2			—			415.3
Operating income (loss)	468.8		189.3		44.3		702.4		—		185.4		(11.9		)	—			875.9
Equity in earnings of transmission affiliates	—		—		—		—		61.5		—		—			—			61.5
Interest expense	97.9		24.6		4.2		126.7		—		32.1		58.3			(1.9		)	215.2

NOTE 20—VARIABLE INTEREST ENTITIES

The primary beneficiary of a variable interest entity must consolidate the entity's assets and liabilities. In addition, certain disclosures are required for significant interest holders in variable interest entities.

We assess our relationships with potential variable interest entities, such as our coal suppliers, natural gas suppliers, coal transporters, natural gas transporters, and other counterparties related to power purchase agreements, investments, and joint ventures. In making this assessment, we consider, along with other factors, the potential that our contracts or other arrangements provide subordinated financial support, the obligation to absorb the entity's losses, the right to receive residual returns of the entity, and the power to direct the activities that most significantly impact the entity's economic performance.

Investment in Transmission Affiliates

We own approximately 60% of ATC, a for-profit, electric transmission company regulated by the FERC and certain state regulatory commissions. We have determined that ATC is a variable interest entity but consolidation is not required since we are not ATC's primary beneficiary. As a result of our limited voting rights, we do not have the power to direct the activities that most significantly impact ATC's economic performance. Therefore, we account for ATC as an equity method investment. At June 30, 2019 and December 31, 2018, our equity investment in ATC was $1,656.6 million and $1,625.3 million, respectively, which approximates our maximum exposure to loss as a result of our involvement with ATC.

06/30/2019 Form 10-Q 31 WEC Energy Group, Inc.

We also own approximately 75% of ATC Holdco, a separate entity formed in December 2016 to invest in transmission-related projects outside of ATC's traditional footprint. We have determined that ATC Holdco is a variable interest entity but consolidation is not required since we are not ATC Holdco's primary beneficiary. As a result of our limited voting rights, we do not have the power to direct the activities that most significantly impact ATC Holdco's economic performance. Therefore, we account for ATC Holdco as an equity method investment. At June 30, 2019 and December 31, 2018, our equity investment in ATC Holdco was $39.9 million and $40.0 million, respectively, which approximates our maximum exposure to loss as a result of our involvement with ATC Holdco.

See Note 18, Investment in Transmission Affiliates, for more information, including any significant assets and liabilities related to ATC and ATC Holdco recorded on our balance sheets.

Power Purchase Agreement

We have a power purchase agreement that represents a variable interest. This agreement is for 236 MWs of firm capacity from a natural gas-fired cogeneration facility, and we account for it as a finance lease. The agreement includes no minimum energy requirements over the remaining term of approximately three years. We have examined the risks of the entity, including operations, maintenance, dispatch, financing, fuel costs, and other factors, and have determined that we are not the primary beneficiary of the entity. We do not hold an equity or debt interest in the entity, and there is no residual guarantee associated with the power purchase agreement.

We have $26.5 million of required capacity payments over the remaining term of this agreement. We believe that the required capacity payments under this contract will continue to be recoverable in rates, and our maximum exposure to loss is limited to these capacity payments.

NOTE 21—COMMITMENTS AND CONTINGENCIES

We and our subsidiaries have significant commitments and contingencies arising from our operations, including those related to unconditional purchase obligations, environmental matters, and enforcement and litigation matters.

Unconditional Purchase Obligations

Our electric utilities have obligations to distribute and sell electricity to their customers, and our natural gas utilities have obligations to distribute and sell natural gas to their customers. The utilities expect to recover costs related to these obligations in future customer rates. In order to meet these obligations, we routinely enter into long-term purchase and sale commitments for various quantities and lengths of time.

Our non-utility energy infrastructure generation facilities have obligations to distribute and sell electricity through long-term offtake agreements with their customers for all of the energy produced. These projects also enter into related easements and other agreements associated with the generating facilities.

Our minimum future commitments related to these purchase obligations as of June 30, 2019, including those of our subsidiaries, were approximately $11.9 billion.

Environmental Matters

Consistent with other companies in the energy industry, we face significant ongoing environmental compliance and remediation obligations related to current and past operations. Specific environmental issues affecting us include, but are not limited to, current and future regulation of air emissions such as sulfur dioxide, nitrogen oxide, fine particulates, mercury, and GHGs; water intake and discharges; disposal of coal combustion products such as fly ash; and remediation of impacted properties, including former manufactured gas plant sites.

06/30/2019 Form 10-Q 32 WEC Energy Group, Inc.

Air Quality

National Ambient Air Quality Standards

After completing its review of the 2008 ozone standard, the EPA released a final rule in October 2015, which lowered the limit for ground-level ozone, creating a more stringent standard than the 2008 National Ambient Air Quality Standards. The EPA issued final nonattainment area designations on May 1, 2018. The following counties within our service territories were designated as partial nonattainment: Door, Kenosha, Manitowoc, Northern Milwaukee/Ozaukee, and Sheboygan shorelines. The state of Wisconsin will need to develop a state implementation plan to bring these areas back into attainment. We will be required to comply with this state implementation plan no earlier than 2020. We believe we are well positioned to meet the requirements associated with the ozone standard and do not expect to incur significant costs to comply.

Mercury and Air Toxics Standards

In December 2018, the EPA proposed to revise the Supplemental Cost Finding for the MATS rule as well as the CAA required RTR. The EPA was required by the United States Supreme Court to review both costs and benefits of complying with the MATS rule. After its review of costs, the EPA determined that it is not appropriate and necessary to regulate hazardous air pollutant emissions from power plants under Section 112 of the CAA. As a result, under the proposed rule, the emission standards and other requirements of the MATS rule first enacted in 2012 would remain in place. The EPA is not proposing to remove coal-and oil-fired power plants from the list of sources that are regulated under Section 112. The EPA also proposes that no revisions to MATS are warranted based on the results of the RTR. As a result, we do not expect the proposed rule to have a material impact on our financial condition or operations.

Climate Change

In July 2019, the EPA published the ACE rule, which provides existing coal-fired generating units with standards for achieving GHG emission reductions. The rule was finalized in conjunction with two other separate and distinct rulemakings, (1) the repeal of the Clean Power Plan, and (2) revised implementing regulations for ACE, ongoing emissions guidelines, and all future emission guidelines for existing sources issued under CAA section 111(d). Every state's plan to implement ACE would need to focus on reducing GHG emissions by improving the efficiency of fossil-fueled power plants. The rule is being litigated.

In December 2018, the EPA proposed to revise the New Source Performance Standards for GHG emissions from new, modified, and reconstructed fossil-fueled power plants. The EPA determined that the BSER for new, modified, and reconstructed coal units is highly efficient generation that would be equivalent to supercritical steam conditions for larger units and subcritical steam conditions for smaller units. This proposed BSER would replace the determination from the previous rule, which identified BSER as partial carbon capture and storage.

In April 2019, we issued a climate report, which analyzes our GHG reduction goals with respect to international efforts to limit future global temperature increases to less than two degrees Celsius. We will continue to update this analysis as climate-change policies and relevant technologies evolve over time with a focus on preserving fuel diversity, lowering costs for customers, and reducing long-term GHG emissions.

Our plan is to work with our industry peers, environmental groups, public policy makers, and customers, with goals of reducing CO₂ emissions by approximately 40% and 80% below 2005 levels by 2030 and 2050, respectively. As a result of our generation reshaping plan, we retired approximately 1,800 MW of coal generation since the beginning of 2018. This plan included the March 31, 2019 retirement of the PIPP as well as the 2018 retirements of the Pleasant Prairie power plant, the Pulliam power plant, and the jointly-owned Edgewater Unit 4 generating units. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP.

Water Quality

Clean Water Act Cooling Water Intake Structure Rule

In August 2014, the EPA issued a final regulation under Section 316(b) of the Clean Water Act that requires the location, design, construction, and capacity of cooling water intake structures at existing power plants to reflect the BTA for minimizing adverse environmental impacts. The rule became effective in October 2014 and applies to all of our existing generating facilities with cooling water intake structures, except for the ERGS units, which were permitted under the rules governing new facilities.

06/30/2019 Form 10-Q 33 WEC Energy Group, Inc.

We have received BTA determinations for Weston Units 2, 3, and 4 and Valley power plant. Although we currently believe that existing technologies at Port Washington Generating Station and OC 5 through OC 8 satisfy the BTA requirements, final determinations will not be made until discharge permits are renewed for these units. Until that time, we cannot determine what, if any, intake structure or operational modifications will be required to meet the new BTA requirements for these units.

We also provided information to the Wisconsin Department of Natural Resources and the MDEQ about generating unit retirements. Following discussions with the MDEQ, in January 2019, we submitted a signed certification stating that the PIPP would be retired no later than June 1, 2019. The PIPP was retired on March 31, 2019.

As a result of past capital investments completed to address 316(b) compliance at WE and WPS, we believe our fleet overall is well positioned to meet the regulation and do not expect to incur significant costs to comply with this regulation.

Steam Electric Effluent Limitation Guidelines

The EPA's final ELG rule took effect in January 2016. This rule created new requirements for several types of power plant wastewaters. The two new requirements that affect WE and WPS relate to discharge limits for BATW and wet FGD wastewater.

This rule is being litigated, and various petitions challenging it were consolidated in the United States Court of Appeals for the Fifth Circuit. In April 2017, the EPA issued an administrative stay of certain compliance deadlines while further reviewing the rule. In September 2017, the EPA issued a final rule (Postponement Rule) to postpone the earliest compliance date to November 1, 2020 for the BATW and wet FGD wastewater requirements. The latest ELG rule compliance date remains December 31, 2023 for any new wastewater treatment requirements contained in power plant discharge permits.

As a result of past capital investments completed to address ELG compliance at WE and WPS, we believe our fleet overall is well positioned to meet the regulations. Our power plant facilities already have advanced wastewater treatment technologies installed that meet many of the discharge limits established by this rule. However, in its current form, the ELG rule would require additional wastewater treatment retrofits and the installation of other equipment to minimize process water use. Due to completed generating unit retirements, we believe the only facilities that would require bottom ash system modifications are Weston Unit 3 and OC 7 and OC 8. One wastewater treatment system modification may be required for the wet FGD discharges from the six units that make up the OCPP and ERGS. Based on preliminary engineering, the estimated rule compliance cost is approximately $70 million.

Land Quality

Manufactured Gas Plant Remediation

We have identified sites at which our utilities or a predecessor company owned or operated a manufactured gas plant or stored manufactured gas. We have also identified other sites that may have been impacted by historical manufactured gas plant activities. Our natural gas utilities are responsible for the environmental remediation of these sites, some of which are in the EPA Superfund Alternative Approach Program. We are also working with various state jurisdictions in our investigation and remediation planning. These sites are at various stages of investigation, monitoring, remediation, and closure.

In addition, we are coordinating the investigation and cleanup of some of these sites subject to the jurisdiction of the EPA under what is called a "multisite" program. This program involves prioritizing the work to be done at the sites, preparation and approval of documents common to all of the sites, and use of a consistent approach in selecting remedies. At this time, we cannot estimate future remediation costs associated with these sites beyond those described below.

The future costs for detailed site investigation, future remediation, and monitoring are dependent upon several variables including, among other things, the extent of remediation, changes in technology, and changes in regulation. Historically, our regulators have allowed us to recover incurred costs, net of insurance recoveries and recoveries from potentially responsible parties, associated with the remediation of manufactured gas plant sites. Accordingly, we have established regulatory assets for costs associated with these sites.

06/30/2019 Form 10-Q 34 WEC Energy Group, Inc.

We have established the following regulatory assets and reserves related to manufactured gas plant sites:

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets	$	707.6	$	687.1
Reserves for future remediation	631.8		616.4

Consent Decrees

Wisconsin Public Service Corporation Consent Decree – Weston and Pulliam Power Plants

In November 2009, the EPA issued an NOV to WPS, which alleged violations of the CAA's New Source Review requirements relating to certain projects completed at the Weston and Pulliam power plants from 1994 to 2009. WPS entered into a Consent Decree with the EPA resolving this NOV. This Consent Decree was entered by the United States District Court for the Eastern District of Wisconsin in March 2013. WPS retired Pulliam Units 7 and 8 in October 2018. WPS also completed the mitigation projects required and received a completeness letter from the EPA in October 2018. We have started the process to terminate the WPS Consent Decree.

Joint Ownership Power Plants Consent Decree – Columbia and Edgewater

In December 2009, the EPA issued an NOV to Wisconsin Power and Light, the operator of the Columbia and Edgewater plants, and the other joint owners of these plants, including Madison Gas and Electric, WE (former co-owner of an Edgewater unit), and WPS. The NOV alleged violations of the CAA's New Source Review requirements related to certain projects completed at those plants. WPS, along with Wisconsin Power and Light, Madison Gas and Electric, and WE, entered into a Consent Decree with the EPA resolving this NOV. This Consent Decree was entered by the United States District Court for the Western District of Wisconsin in June 2013. As a result of the continued implementation of the Consent Decree related to the jointly owned Columbia and Edgewater plants, the Edgewater 4 generating unit was retired in September 2018.

Enforcement and Litigation Matters

We and our subsidiaries are involved in legal and administrative proceedings before various courts and agencies with respect to matters arising in the ordinary course of business. Although we are unable to predict the outcome of these matters, management believes that appropriate reserves have been established and that final settlement of these actions will not have a material effect on our financial condition or results of operations.

NOTE 22—SUPPLEMENTAL CASH FLOW INFORMATION

	Six Months Ended June 30
(in millions)	2019			2018
Cash (paid) for interest, net of amount capitalized	$	(247.9	)	$	(215.6	)
Cash (paid) for income taxes, net	(15.1		)	(47.6		)
Significant non-cash investing and financing transactions:
Accounts payable related to construction costs	137.3			77.4
Non-cash capital contributions from noncontrolling interest	10.2			—

The statements of cash flows include our activity related to cash, cash equivalents, and restricted cash. Our restricted cash primarily consists of the cash held in the Integrys rabbi trust, which is used to fund participants' benefits under the Integrys deferred compensation plan and certain Integrys non-qualified pension plans. All assets held within the rabbi trust are restricted as they can only be withdrawn from the trust to make qualifying benefit payments. Our restricted cash also includes the restricted cash we received when we acquired ownership interests in Bishop Hill III and Upstream during August 2018 and January 2019, respectively. This cash is restricted as it can only be used to pay for any remaining costs associated with the construction of these wind generation facilities. See Note 2, Acquisitions, for more information on the acquisitions of Bishop Hill III and Upstream.

06/30/2019 Form 10-Q 35 WEC Energy Group, Inc.

The following table reconciles the cash, cash equivalents, and restricted cash amounts reported within the balance sheets at June 30 to the total of these amounts shown on the statements of cash flows:

(in millions)	2019		2018
Cash and cash equivalents	$	37.9	$	29.8
Restricted cash included in other long term assets	52.8		22.2
Cash, cash equivalents, and restricted cash	$	90.7	$	52.0

NOTE 23—REGULATORY ENVIRONMENT

Wisconsin Electric Power Company, Wisconsin Gas LLC, and Wisconsin Public Service Corporation

2020 and 2021 Rates

In March 2019, WE, WG, and WPS filed applications with the PSCW to increase their retail electric, natural gas, and steam rates, as applicable, effective January 1, 2020. The WE and WPS proposals are targeting effective electric rate increases of approximately $83 million (2.9%) and $49 million (4.9%), respectively, in 2020, and additional increases of $83 million (2.9%) and $49 million (4.9%), respectively, in 2021. For WE’s, WG’s, and WPS’s natural gas customers, the proposals are targeting effective rate increases of approximately $15 million (3.9%), $11 million (1.8%), and $7 million (2.4%), respectively, in 2020. WPS is proposing an additional effective natural gas rate increase of $7 million (2.4%) in 2021. The WE proposal also targets a $1 million (4.5%) effective increase in its steam rates in 2020. The proposals for WE, WG, and WPS reflect a ROE of 10.35%, 10.30%, and 10.35%, respectively. All three of these Wisconsin utilities proposed a common equity component average of 52.0% on a financial basis and proposed to continue having an earnings sharing mechanism through 2021.

The proposed increase in electric rates at WE was driven by higher transmission charges, recovery of SSR revenues that were assumed in WE's 2015 rate order but were not received, and an increase in costs associated with a purchased power agreement previously approved by the PSCW. WE's proposed electric rates reflect its request to partially offset these increases with approximately $111 million of previously deferred tax benefits from the Tax Legislation. WE's proposal also includes its request for approval to continue collecting the carrying value of the Pleasant Prairie power plant and the PIPP using the current approved composite depreciation rates, in addition to a return on the remaining carrying value of the plants.

The proposed increase in electric rates at WPS was driven by the inclusion of WPS's SMRP, the Forward Wind Energy Center, and WPS's investments in two solar projects in rates, along with continued investments in system reliability and the recovery of various regulatory deferrals, including the deferral of the revenue requirement for ReACT™ costs above a previously authorized level. WPS's proposed electric rates reflect its request to use $40 million of previously deferred tax benefits from the Tax Legislation to partially offset these increases. WPS's proposal also includes its request for approval to continue collecting the carrying value of Pulliam units 7 and 8 and the Edgewater 4 generating unit using the current approved composite depreciation rates, in addition to a return on the remaining carrying value of the units.

The proposed increases at our Wisconsin natural gas utilities were driven by continued investment in our natural gas distribution systems. WPS’s proposed 2020 natural gas rate increase is net of approximately $7 million of previously deferred tax benefits from the Tax Legislation.

Final orders are expected from the PSCW by the end of 2019, with rates effective January 1, 2020.

2018 and 2019 Rates

During April 2017, WE, WG, and WPS filed an application with the PSCW for approval of a settlement agreement they made with several of their commercial and industrial customers regarding 2018 and 2019 base rates. In September 2017, the PSCW issued an order that approved the settlement agreement, which freezes base rates through 2019 for electric, natural gas, and steam customers of WE, WG, and WPS. Based on the PSCW order, the authorized ROE for WE, WG, and WPS remains at 10.2%, 10.3%, and 10.0%, respectively, and the current capital cost structure for all of our Wisconsin utilities will remain unchanged through 2019.

In addition to freezing base rates, the settlement agreement extends and expands the electric real-time market pricing program options for large commercial and industrial customers and mitigates the continued growth of certain escrowed costs at WE during the base rate freeze period by accelerating the recognition of certain tax benefits. WE will flow through the tax benefit of its repair-related deferred tax liabilities in 2018 and 2019, to maintain certain regulatory asset balances at their December 31, 2017 levels.

06/30/2019 Form 10-Q 36 WEC Energy Group, Inc.

While WE would typically follow the normalization accounting method and utilize the tax benefits of the deferred tax liabilities in rate-making as an offset to rate base, benefiting customers over time, the federal tax code does allow for passing these tax repair-related benefits to ratepayers much sooner using the flow through accounting method. The flow through treatment of the repair-related deferred tax liabilities offsets the negative income statement impact of holding the regulatory assets level, resulting in no change to net income.

The agreement also allows WPS to extend through 2019, the deferral for the revenue requirement of ReACT™ costs above the authorized $275.0 million level, and other deferrals related to WPS's electric real-time market pricing program and network transmission expenses. The total cost of the ReACT™ project, excluding $51 million of AFUDC, was $342 million.

Pursuant to the settlement agreement, WPS also agreed to adopt, beginning in 2018, the earnings sharing mechanism that has been in place for WE and WG since January 2016, and all three utilities agreed to keep the mechanism in place through 2019. Under this earnings sharing mechanism, if WE, WG, or WPS earns above its authorized ROE, 50% of the first 50 basis points of additional utility earnings must be shared with customers. All utility earnings above the first 50 basis points must also be shared with customers.

Solar Generation Projects

On August 1, 2019, WE, along with an unaffiliated utility, filed an application with the PSCW for approval to acquire an ownership interest in Badger Hollow II, a solar project that will be located in Iowa County, Wisconsin. Subject to receipt of the PSCW's approval, WE will own 100 MW of the output of this project. WE's share of the cost of this project is estimated to be $130 million. Commercial operation for Badger Hollow II is targeted for the end of 2021.

On May 31, 2018, WPS, along with an unaffiliated utility, filed an application with the PSCW for approval to acquire ownership interests in two solar projects in Wisconsin. Badger Hollow I will be located in Iowa County, Wisconsin, and Two Creeks Solar Project will be located in Manitowoc County, Wisconsin. WPS will own 100 MW of the output of each project for a total of 200 MW. WPS's share of the cost of both projects is estimated to be $260 million. The PSCW approved the acquisition of these two projects in April 2019. Commercial operation for both projects is targeted for the end of 2020.

The Peoples Gas Light and Coke Company and North Shore Gas Company

Illinois Proceedings

In December 2015, the ICC ordered a series of stakeholder workshops to evaluate PGL's SMP. This ICC action did not impact PGL's ongoing work to modernize and maintain the safety of its natural gas distribution system, but it instead provided the ICC with an opportunity to analyze long-term elements of the program through the stakeholder workshops. The workshops were completed in March 2016. In July 2016, the ICC initiated a proceeding to review, among other things, the planning, reporting, and monitoring of the program, including the target end date for the program, and issued a final order in January 2018. The order did not have a significant impact on PGL's existing SMP design and execution. An appeal related to the final order was filed by the Illinois AG in April 2018. On June 28, 2019, the Illinois Appellate Court issued its ruling affirming the ICC’s final order.

Qualifying Infrastructure Plant Rider

In July 2013, Illinois Public Act 98-0057, The Natural Gas Consumer, Safety & Reliability Act, became law. This law provides PGL with a cost recovery mechanism that allows collection, through a surcharge on customer bills, of prudently incurred costs to upgrade Illinois natural gas infrastructure. In September 2013, PGL filed with the ICC requesting the proposed rider, which was approved in January 2014.

PGL's QIP rider is subject to an annual reconciliation whereby costs are reviewed for accuracy and prudency. In March 2019, PGL filed its 2018 reconciliation with the ICC, which, along with the 2017 and 2016 reconciliations, are still pending. In June 2019, PGL agreed to a settlement of the 2015 reconciliation, which includes a rate base reduction of $7.0 million and a $7.3 million refund to ratepayers. The ICC approved the settlement on July 17, 2019. The settlement will not have a material impact on earnings.

As of June 30, 2019, there can be no assurance that all costs incurred under PGL's QIP rider during the open reconciliation years will be deemed recoverable by the ICC.

06/30/2019 Form 10-Q 37 WEC Energy Group, Inc.

Minnesota Energy Resources Corporation

2018 Minnesota Rate Case

In October 2017, MERC initiated a rate proceeding with the MPUC. In December 2018, the MPUC issued a final written order for MERC. The order authorized a retail natural gas rate increase of $3.1 million (1.26%). The rates reflect a 9.7% ROE and a common equity component average of 50.9%. The final rates were implemented on July 1, 2019. The final approved rate increase was lower than the interim rates collected from customers during 2018 and through June 30, 2019. Therefore, as of June 30, 2019, we estimated that $7.6 million will be refunded to MERC's customers in September 2019.

The final order addressed the various impacts of the Tax Legislation, including the remeasurement of deferred tax balances. All of the impacts from the Tax Legislation have been included in base rates. The order also approved MERC's continued use of its decoupling mechanism for residential customers. Effective January 1, 2019, MERC's small commercial and industrial customers are no longer included in the decoupling mechanism.

Upper Michigan Energy Resources Corporation and Michigan Gas Utilities Corporation

Tax Cuts and Jobs Act of 2017

In February 2018, the MPSC issued an order requiring Michigan utilities to make three filings related to the Tax Legislation. The first of those filings, which was filed in March 2018, prospectively addressed the impact on base rates for the change in tax expense resulting from the federal tax rate reduction from 35% to 21%. UMERC and MGU proposed providing a volumetric bill credit, subject to reconciliation and true up. In May 2018, the MPSC issued orders approving settlements that resulted in volumetric bill credits for all of UMERC's and MGU's customers effective July 1, 2018. The bill credits will remain in effect until each company's next rate proceeding.

The second filing, which was filed in July 2018, addressed the impact on base rates for the change in tax expense resulting from the federal tax rate reduction from 35% to 21% from January 1, 2018 until July 1, 2018. UMERC and MGU proposed to return the tax savings from these months to customers via volumetric bill credits over multiple months. The MPSC issued orders approving settlements in September 2018. In accordance with the settlement orders, the savings were returned to UMERC's and MGU's customers via volumetric bill credits that were in effect from October 1, 2018 through December 31, 2018.

The third filing was filed in October 2018 and addressed the remaining impacts of the Tax Legislation on base rates – most notably the re-measurement of deferred tax balances. UMERC and MGU proposed providing a volumetric bill credit, subject to reconciliation and true up, to return these remaining impacts of the Tax Legislation to customers. The MPSC issued orders approving settlements in May 2019. The settlement orders provide for volumetric bill credits to UMERC’s and MGU’s customers effective June 1, 2019. The bill credits will remain in effect until each company's next rate proceeding.

NOTE 24—NEW ACCOUNTING PRONOUNCEMENTS

Financial Instruments Credit Losses

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. This ASU introduces a new impairment model known as the current expected credit loss model. The ASU requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. Previously, recognition of the full amount of credit losses was generally delayed until the loss was probable of occurring. We are currently assessing the effects this guidance may have on our financial statements.

06/30/2019 Form 10-Q 38 WEC Energy Group, Inc.

Cloud Computing

In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The standard allows entities who are customers in hosting arrangements that are service contracts to apply the existing internal-use software guidance to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The guidance specifies classification for capitalizing implementation costs and related amortization expense within the financial statements and requires additional disclosures. The guidance will be effective for annual reporting periods, including interim reporting within those periods, beginning after December 15, 2019. Early adoption is permitted and can be applied either retrospectively or prospectively. We are currently evaluating the transition methods and the impact the adoption of this standard may have on our financial statements.

Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework: Changes to the Disclosure Requirements for Defined Benefit Plans. The pronouncement modifies the disclosure requirements for defined benefit pension and other postretirement benefit plans. The guidance removes disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures and adds disclosure requirements identified as relevant. The modifications affect annual period disclosures and must be applied on a retrospective basis to all periods presented. The guidance will be effective for annual reporting periods ending after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this pronouncement on our Notes to Consolidated Financial Statements.

06/30/2019 Form 10-Q 39 WEC Energy Group, Inc.

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

CORPORATE DEVELOPMENTS

The following discussion should be read in conjunction with the accompanying financial statements and related notes and our 2018 Annual Report on Form 10-K.

Introduction

We are a diversified holding company with natural gas and electric utility operations (serving customers in Wisconsin, Illinois, Michigan, and Minnesota), an approximately 60% equity ownership interest in American Transmission Company LLC (ATC) (a for-profit electric transmission company regulated by the FERC and certain state regulatory commissions), and non-utility energy infrastructure operations through We Power (which owns generation assets in Wisconsin), Bluewater (which owns underground natural gas storage facilities in Michigan), a 90% ownership interest in Bishop Hill III (a wind generating facility in Illinois), and an 80% ownership interest in Upstream (a wind generating facility in Nebraska).

In December 2018, WEC Energy Group acquired an 80% ownership interest in Coyote Ridge, a 97.5 MW wind farm under construction in Brookings County, South Dakota. This wind farm is expected to be in service by the end of 2019, and is included in the non-utility energy infrastructure segment. See Note 2, Acquisitions, for more information.

Corporate Strategy

Our goal is to continue to build and sustain long-term value for our shareholders and customers by focusing on the fundamentals of our business: reliability; operating efficiency; financial discipline; customer care; and safety.

Reshaping Our Generation Fleet

The planned reshaping of our generation fleet will balance reliability and customer cost with environmental stewardship. Taken as a whole, this plan should reduce costs to customers, preserve fuel diversity, and lower carbon emissions. Generation reshaping includes retiring older fossil fuel generation units, building state-of-the-art natural gas generation, and investing in cost-effective zero-carbon generation with a goal of reducing CO₂ emissions by approximately 40% below 2005 levels by 2030 and by approximately 80% below 2005 levels by 2050. We retired approximately 1,800 MW of coal generation since the beginning of 2018, and expect to add additional natural gas-fired generating units and renewable generation, including utility-scale solar projects. Our 1,190 MW Pleasant Prairie power plant was retired in April 2018. The physical dismantlement of the Pleasant Prairie power plant will not occur immediately as it may take several years to finalize long-term plans for the site. The Edgewater 4 generating unit was retired in September 2018, the Pulliam power plant was retired in October 2018, and the Presque Isle power plant (PIPP) was retired in March 2019. See Note 6, Property, Plant, and Equipment, for information related to the PIPP retirement.

As part of our commitment to invest in zero-carbon generation, we plan to invest in utility scale solar up to 350 MW within our Wisconsin segment. Wisconsin Public Service Corporation (WPS) has partnered with an unaffiliated utility to acquire ownership interests in two proposed solar projects in Wisconsin. Badger Hollow Solar Farm I will be located in Iowa County, Wisconsin, and Two Creeks Solar Project will be located in Manitowoc County, Wisconsin. WPS will own 100 MW of the output of each project for a total of 200 MW. The Public Service Commission of Wisconsin (PSCW) approved the acquisition of these two projects in April 2019. Commercial operation for both projects is targeted for the end of 2020. Wisconsin Electric Power Company (WE) has partnered with an unaffiliated utility to acquire an ownership interest in Badger Hollow Solar Farm II, a solar project that will be located in Iowa County, Wisconsin. Subject to PSCW approval, WE will own 100 MW of the output of the project. Commercial operation is targeted for the end of 2021.

In December 2018, WE received approval from the PSCW for two renewable energy pilot programs. The Solar Now pilot is expected to add 35 MW of solar to WE's portfolio, allowing commercial and industrial customers to site utility owned solar arrays on their property. The second program, the Dedicated Renewable Energy Resource pilot, would allow large commercial and industrial customers to access renewable resources that WE would operate, adding up to 150 MW of renewables to WE's portfolio, and allowing these larger customers to meet their sustainability and renewable energy goals.

As the cost of renewable energy generation continues to decline, both the WPS solar projects and the WE pilots have become cost effective opportunities for WEC Energy Group and our customers to participate in renewable energy.

06/30/2019 Form 10-Q 40 WEC Energy Group, Inc.

Reliability

We have made significant reliability-related investments in recent years, and plan to continue strengthening and modernizing our generation fleet and distribution networks to further improve reliability. Our investments, coupled with our commitment to operating efficiency and customer care, resulted in We Energies being recognized in 2018 by PA Consulting Group, an independent consulting firm, as the most reliable utility in the Midwest for the eighth year in a row.

Below are a few examples of reliability projects that were recently completed or are currently underway.

• Upper Michigan Energy Resources Corporation (UMERC), our Michigan electric and natural gas utility, has completed its long-term generation solution for electric reliability in the Upper Peninsula of Michigan. The plan called for UMERC to construct and operate approximately 180 MW of natural gas-fueled generation located in the Upper Peninsula. The new generation achieved commercial operation on March 31, 2019, and is providing the region with affordable, reliable electricity that generates less emissions than the PIPP. Consistent with a written approval letter received from the Midcontinent Independent System Operator, the PIPP was retired on March 31, 2019.

• The Peoples Gas Light and Coke Company continues to work on its Natural Gas System Modernization Program, which primarily involves replacing old cast and ductile iron pipes and facilities in Chicago’s natural gas delivery system with modern polyethylene pipes to reinforce the long-term safety and reliability of the system.

• WPS continues work on its System Modernization and Reliability Project, which involves modernizing parts of its electric distribution system, including burying or upgrading lines. The project focuses on constructing facilities to improve the reliability of electric service WPS provides to its customers. WPS, WE, and Wisconsin Gas LLC also continue to upgrade their electric and natural gas distribution systems to enhance reliability.

Operating Efficiency

We continually look for ways to optimize the operating efficiency of our company. For example, we are making progress on our Advanced Metering Infrastructure program, replacing aging meter-reading equipment on both our network and customer property. An integrated system of smart meters, communication networks, and data management programs enables two-way communication between our utilities and our customers. This program reduces the manual effort for disconnects and reconnects and enhances outage management capabilities.

We continue to focus on integrating and improving business processes and consolidating our IT infrastructure across all of our companies. We expect these efforts to continue to drive operational efficiency and to put us in position to effectively support plans for future growth.

Financial Discipline

A strong adherence to financial discipline is essential to meeting our earnings projections and maintaining a strong balance sheet, stable cash flows, a growing dividend, and quality credit ratings.

We follow an asset management strategy that focuses on investing in and acquiring assets consistent with our strategic plans, as well as disposing of assets, including property, plants, equipment, and entire business units, that are no longer strategic to operations, are not performing as intended, or have an unacceptable risk profile.

• See Note 2, Acquisitions, for information about our acquisitions of portions of wind energy generation facilities in Wisconsin, Illinois, Nebraska, and South Dakota.

• See Note 3, Disposition, for information on the sale of certain WPS Power Development, LLC solar power generation facilities.

Our investment focus remains in our regulated utility and non-utility energy infrastructure businesses, as well as our investment in ATC. We expect total capital expenditures for our regulated utility and non-utility energy infrastructure businesses to be almost $12.7 billion from 2019 to 2023. Specific projects are discussed in more detail below under Liquidity and Capital Resources.

06/30/2019 Form 10-Q 41 WEC Energy Group, Inc.

From 2019 to 2023, we expect capital contributions to ATC and ATC Holdco to be approximately $250 million. ATC Holdco is a separate entity formed in December 2016 to invest in transmission-related projects outside of ATC's traditional footprint. Capital investments at ATC and ATC Holdco will be funded utilizing these capital contributions, in addition to cash generated from operations and debt. We currently forecast that our share of ATC's and ATC Holdco's projected capital expenditures over the next five years will be $1.2 billion inside the traditional ATC footprint and $250 million outside of the traditional ATC footprint.

Exceptional Customer Care

Our approach is driven by an intense focus on delivering exceptional customer care every day. We strive to provide the best value for our customers by embracing constructive change, demonstrating personal responsibility for results, leveraging our capabilities and expertise, and using creative solutions to meet or exceed our customers’ expectations.

One example of how we obtain feedback from our customers is through our "We Care" calls, through which employees of our utility subsidiaries contact customers after a completed service call. Customer satisfaction is a priority, and making "We Care" calls is one of the main methods we use to gauge our performance to improve customer satisfaction.

Safety

We have a long-standing commitment to both workplace and public safety, and under our "Target Zero" mission, we have an ultimate goal of zero incidents, accidents, and injuries. We also set goals around injury-prevention activities that raise awareness and facilitate conversations about employee safety. Our corporate safety program provides a forum for addressing employee concerns, training employees and contractors on current safety standards, and recognizing those who demonstrate a safety focus.

06/30/2019 Form 10-Q 42 WEC Energy Group, Inc.

RESULTS OF OPERATIONS

THREE MONTHS ENDED JUNE 30, 2019

Consolidated Earnings

The following table compares our consolidated results for the second quarter of 2019 with the second quarter of 2018, including favorable or better, "B", and unfavorable or worse, "W", variances:

	Three Months Ended June 30
(in millions, except per share data)	2019			2018			B (W)			Change Related to Flow Through of Tax Repairs			Change Related to Adoption of New Lease Guidance (Topic 842)			Remaining Change B (W)
Wisconsin	$	270.2		$	195.1		$	75.1		$	(11.1	)	$	87.9		$	(1.7	)
Illinois	42.6			41.7			0.9			—			—			0.9
Other states	4.6			8.1			(3.5		)	—			—			(3.5		)
Non-utility energy infrastructure	91.3			92.4			(1.1		)	—			—			(1.1		)
Corporate and other	(7.1		)	(6.5		)	(0.6		)	—			—			(0.6		)
Reconciling eliminations *	(87.0		)	—			(87.0		)	—			(87.0		)	—
Total operating income	314.6			330.8			(16.2		)	(11.1		)	0.9			(6.0		)
Equity in earnings of transmission affiliates	36.9			28.7			8.2			—			—			8.2
Other income, net	23.6			31.4			(7.8		)	—			—			(7.8		)
Interest expense	124.1			108.5			(15.6		)	—			(0.9		)	(14.7		)
Income before income taxes	251.0			282.4			(31.4		)	(11.1		)	—			(20.3		)
Income tax expense	15.2			51.1			35.9			11.1			—			24.8
Preferred stock dividends of subsidiary	0.3			0.3			—			—			—			—
Net loss attributed to noncontrolling interests	0.2			—			0.2			—			—			0.2
Net income attributed to common shareholders	$	235.7		$	231.0		$	4.7		$	—		$	—		$	4.7
Diluted earnings per share	$	0.74		$	0.73		$	0.01

* We adopted ASU 2016-02, Leases (Topic 842) effective January 1, 2019, which revised the previous guidance regarding the accounting for leases. As a result of this adoption, for the three months ended June 30, 2019, $87.0 million of minimum lease payments that were billed from We Power to WE were no longer classified within operation and maintenance, but were instead recorded as interest expense in accordance with Topic 842. The We Power lease does not impact our financial statements as all amounts associated with the lease are eliminated at the consolidated level.

Earnings increased $4.7 million during the second quarter of 2019, compared with the same quarter in 2018. The table above shows the income statement impacts associated with the flow through of tax repairs beginning January 1, 2018 and the adoption of Topic 842, effective January 1, 2019. As shown in the table above, the changes related to these items had no impact on net income attributed to common shareholders. See Note 23, Regulatory Environment, for more information on the flow through of tax repairs and Note 10, Leases, for more information on the adoption of Topic 842.

The significant factors impacting the $4.7 million increase in earnings were:

• A $24.8 million remaining decrease in income tax expense, primarily driven by impacts from the Tax Legislation, lower income before income taxes, an increase in wind production tax credits related to recent acquisitions of wind generation facilities in our non-utility energy infrastructure segment, and the recognition of deferred investment tax credits related to the sale of certain PDL solar power generation facilities completed during the second quarter of 2019.

• An $8.2 million increase in earnings from our ownership interests in transmission affiliates, primarily due to continued capital investment by ATC and the impact of the refund ATC was required to provide customers in the second quarter of 2018 as a result of the FERC financial audit completed in February 2018.

06/30/2019 Form 10-Q 43 WEC Energy Group, Inc.

These increases in earnings were partially offset by:

• A $14.7 million remaining increase in interest expense, driven by higher debt balances, primarily used to fund capital investments, and higher interest rates on short-term debt.

• A $7.8 million decrease in other income, net, primarily driven by a 2018 item that was offset in other operation and maintenance expense and lower gains on the investments held in the Integrys rabbi trust. The gains from the investments held in the rabbi trust partially offset benefits costs related to deferred compensation included in operating income. See Note 13, Fair Value Measurements, for more information on our investments held in the Integrys rabbi trust.

• A $3.5 million decrease in operating income at the other states segment, driven by lower natural gas margins primarily due to the timing of interim rate recognition at MERC in 2018.

Non-GAAP Financial Measures

The discussions below address the operating income contribution of each of our segments and include financial information prepared in accordance with GAAP, as well as electric margins and natural gas margins, which are not measures of financial performance under GAAP. Electric margin (electric revenues less fuel and purchased power costs) and natural gas margin (natural gas revenues less cost of natural gas sold) are non-GAAP financial measures because they exclude other operation and maintenance expense, depreciation and amortization, and property and revenue taxes.

We believe that electric and natural gas margins provide a useful basis for evaluating utility operations since the majority of prudently incurred fuel and purchased power costs, as well as prudently incurred natural gas costs, are passed through to customers in current rates. As a result, management uses electric and natural gas margins internally when assessing the operating performance of our segments as these measures exclude the majority of revenue fluctuations caused by changes in these expenses. Similarly, the presentation of electric and natural gas margins herein is intended to provide supplemental information for investors regarding our operating performance.

Our electric margins and natural gas margins may not be comparable to similar measures presented by other companies.  Furthermore, these measures are not intended to replace operating income as determined in accordance with GAAP as an indicator of our segment operating performance. Operating income for the second quarter of 2019 and 2018 for each of our segments is presented in the “Consolidated Earnings” table above.

Each applicable segment operating income discussion below includes a table that provides the calculation of electric margins and natural gas margins, as applicable, along with a reconciliation to segment operating income.

Wisconsin Segment Contribution to Operating Income

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Electric revenues	$	1,024.4	$	1,087.5	$	(63.1	)
Fuel and purchased power	310.7		328.2		17.5
Total electric margins	713.7		759.3		(45.6		)
Natural gas revenues	228.9		238.0		(9.1		)
Cost of natural gas sold	116.4		124.9		8.5
Total natural gas margins	112.5		113.1		(0.6		)
Total electric and natural gas margins	826.2		872.4		(46.2		)
Other operation and maintenance	363.9		502.4		138.5
Depreciation and amortization	152.9		134.6		(18.3		)
Property and revenue taxes	39.2		40.3		1.1
Operating income	$	270.2	$	195.1	$	75.1

06/30/2019 Form 10-Q 44 WEC Energy Group, Inc.

The following table shows a breakdown of other operation and maintenance:

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Operation and maintenance not included in line items below	$	154.9	$	188.4	$	33.5
We Power (1)	34.2		125.9		91.7
Transmission (2)	103.6		104.5		0.9
Transmission expense related to the flow through of tax repairs (3)	16.5		10.0		(6.5		)
Transmission expense related to Tax Legislation (4)	17.5		33.8		16.3
Regulatory amortizations and other pass through expenses (5)	37.2		36.1		(1.1		)
Earnings sharing mechanisms (6)	—		3.7		3.7
Total other operation and maintenance	$	363.9	$	502.4	$	138.5

⁽¹⁾  Represents costs associated with the We Power generation units, including operating and maintenance costs recognized by WE. For the three months ended June 30, 2018, the amount also included the lease payments that were billed from We Power to WE and then recovered in WE's rates. We adopted ASU 2016-02, Leases (Topic 842) effective January 1, 2019, which revised the previous guidance regarding the accounting for leases. As a result of this adoption, for the three months ended June 30, 2019, the $90.6 million of lease expense related to the We Power leases with WE was no longer classified within other operation and maintenance, but was instead recorded as $3.6 million and $87.0 million of depreciation and amortization and interest expense, respectively, in accordance with Topic 842. The We Power lease does not impact our financial statements as all amounts associated with the lease are eliminated at the consolidated level.

During the three months ended June 30, 2019, $45.6 million of operating and maintenance costs were billed to or incurred by WE related to the We Power generation units, with the difference in costs billed or incurred and expenses recognized, either deferred or deducted from the regulatory asset. During the three months ended June 30, 2018, $126.1 million of both lease and operating and maintenance costs were billed to or incurred by WE related to the WE Power generation units, with the difference in costs billed or incurred and expenses recognized, either deferred or deducted from the regulatory asset.

⁽²⁾  Represents transmission expense that we are authorized to collect in rates, in accordance with the PSCW's approval of escrow accounting for ATC and MISO network transmission expenses for our Wisconsin electric utilities. As a result, WE and WPS defer as a regulatory asset or liability, the difference between actual transmission costs and those included in rates until recovery or refund is authorized in a future rate proceeding. During the three months ended June 30, 2019 and 2018, $119.5 million and $97.3 million, respectively, of costs were billed to our electric utilities by transmission providers.

⁽³⁾  Represents additional transmission expense associated with WE's flow through of tax benefits of its repair-related deferred tax liabilities starting in 2018 in accordance with a settlement agreement with the PSCW, to maintain certain regulatory asset balances at their December 31, 2017 levels. See Note 23, Regulatory Environment, for more information.

⁽⁴⁾  Represents additional transmission expense associated with the May 2018 PSCW order requiring WE to use 80% of its current 2018 tax benefit, including the amortization associated with the revaluation of deferred taxes, to reduce its transmission regulatory asset balance.

⁽⁵⁾  Regulatory amortizations and other pass through expenses are substantially offset in margins and therefore do not have a significant impact on operating income.

⁽⁶⁾  See Note 23, Regulatory Environment, for more information about our earnings sharing mechanisms.

06/30/2019 Form 10-Q 45 WEC Energy Group, Inc.

The following tables provide information on delivered sales volumes by customer class and weather statistics:

	Three Months Ended June 30
	MWh (in thousands)
Electric Sales Volumes	2019	2018	B (W)
Customer Class
Residential	2,336.8	2,565.6	(228.8	)
Small commercial and industrial *	3,054.8	3,221.0	(166.2	)
Large commercial and industrial *	3,155.1	3,263.3	(108.2	)
Other	39.2	38.1	1.1
Total retail *	8,585.9	9,088.0	(502.1	)
Wholesale	820.8	875.9	(55.1	)
Resale	1,789.2	793.1	996.1
Total sales in MWh *	11,195.9	10,757.0	438.9

* Includes distribution sales for customers who purchased power from an alternative electric supplier in Michigan.

	Three Months Ended June 30
	Therms (in millions)
Natural Gas Sales Volumes	2019	2018	B (W)
Customer Class
Residential	170.7	169.5	1.2
Commercial and industrial	108.1	121.9	(13.8	)
Total retail	278.8	291.4	(12.6	)
Transport	320.9	322.2	(1.3	)
Total sales in therms	599.7	613.6	(13.9	)

	Three Months Ended June 30
	Degree Days
Weather	2019	2018	B (W)
WE and WG (1)
Heating (921 normal)	973	1,023	(4.9	)%
Cooling (166 normal)	76	217	(65.0	)%
WPS (2)
Heating (951 normal)	1,040	1,081	(3.8	)%
Cooling (136 normal)	78	215	(63.7	)%
UMERC (3)
Heating (1,178 normal)	1,333	1,206	10.5	%
Cooling (79 normal)	49	138	(64.5	)%

⁽¹⁾  Normal degree days are based on a 20-year moving average of monthly temperatures from Mitchell International Airport in Milwaukee, Wisconsin.

⁽²⁾  Normal degree days are based on a 20-year moving average of monthly temperatures from the Green Bay, Wisconsin weather station.

⁽³⁾  Normal degree days are based on a 20-year moving average of monthly temperatures from the Iron Mountain, Michigan weather station.

06/30/2019 Form 10-Q 46 WEC Energy Group, Inc.

Electric Utility Margins

Electric utility margins at the Wisconsin segment decreased $45.6 million during the second quarter of 2019, compared with the same quarter in 2018. The significant factors impacting the lower electric utility margins were:

• A $33.9 million decrease related to lower retail sales volumes during the second quarter of 2019, primarily driven by unfavorable weather. As measured by cooling degree days, the second quarter of 2019 was 65.0% and 63.7% cooler than the same quarter in 2018 in the Milwaukee area and Green Bay area, respectively. As measured by heating degree days, the second quarter of 2019 was 4.9% and 3.8% warmer than the same quarter in 2018 in the Milwaukee area and Green Bay area, respectively.

• A $23.5 million decrease in margins related to savings from the Tax Legislation that we are required to return to customers through bill credits or reductions in other regulatory assets. This decrease in margins was offset by the net impact of $16.3 million decrease in transmission expense, a $12.3 million decrease in income taxes, and a $5.1 million increase in depreciation and amortization expense. We received the PSCW order in May 2018, which required WE and WPS to use 80% and 40%, respectively, of the current 2018 and 2019 tax benefits to reduce certain regulatory assets. Prior to receiving the order, we recorded all of the expected benefits related to the Tax Legislation as if they would be returned to customers through bill credits, which resulted in a decrease in revenues in the first quarter of 2018. After receiving the order during the second quarter of 2018, we reversed a portion of this decrease in revenues we had assumed would be returned to customers as bill credits and instead applied the tax savings by reducing the regulatory assets.

• A $4.6 million decrease in margins associated with WE's flow through of tax benefits of its repair-related deferred tax liabilities starting in 2018 in accordance with a settlement agreement with the PSCW to maintain certain regulatory assets at their December 31, 2017 levels. See Note 23, Regulatory Environment, for more information.

These decreases in margins were partially offset by a $14.1 million quarter-over-quarter positive impact from collections of fuel and purchased power costs compared with costs approved in rates. Under the Wisconsin fuel rules, the margins of our electric utilities are impacted by under- or over-collections of certain fuel and purchased power costs that are less than a 2% price variance from the costs included in rates, and the remaining variance that exceeds the 2% variance is deferred.

Natural Gas Utility Margins

Natural gas utility margins at the Wisconsin segment decreased $0.6 million during the second quarter of 2019, compared with the same quarter in 2018. The most significant factor impacting the decrease in natural gas utility margins was lower sales volumes, primarily driven by unfavorable weather during the second quarter of 2019, compared with the same quarter in 2018.

Operating Income

Operating income at the Wisconsin segment increased $75.1 million during the second quarter of 2019, compared with the same quarter in 2018. This increase was driven by $121.3 million of lower operating expenses (which include other operation and maintenance, depreciation and amortization, and property and revenue taxes), partially offset by the $46.2 million decrease in margins discussed above.

The significant factors impacting the decrease in operating expenses during the second quarter of 2019, compared with the same quarter in 2018, were:

• A $90.6 million decrease in other operation and maintenance resulting from the adoption of the new lease guidance. As discussed in the other operation and maintenance table above, the adoption of Topic 842, effective January 1, 2019, required WE to change the income statement classification of its lease payments related to the We Power leases. For the second quarter of 2019, the minimum lease payments that were billed from We Power to WE were no longer classified within other operation and maintenance, but were instead recorded as a component of depreciation and amortization and interest expense in accordance with Topic 842.

• A $16.7 million decrease in operation and maintenance expenses across all of our plants, in part due to the retirements of the Pleasant Prairie power plant in April 2018, Edgewater Unit 4 in September 2018, Pulliam Units 7 and 8 in October 2018, and the PIPP in March 2019. This resulted in lower maintenance and labor costs during the second quarter of 2019. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP.

06/30/2019 Form 10-Q 47 WEC Energy Group, Inc.

• A $9.9 million decrease in operation and maintenance expense due to a 2018 item that was offset in other income, net and had no impact on net income for the quarter.

• A $9.8 million net decrease in transmission expense. This was driven by a $16.3 million decrease related to the May 2018 order from the PSCW related to our required treatment of the benefits associated with the Tax Legislation, which was offset by a corresponding decrease in margins, as previously discussed. Partially offsetting this decrease to transmission expense was a $6.5 million increase related to the flow through of tax repairs. Both changes in transmission expense are discussed in the other operation and maintenance table above.

• A $3.7 million decrease in operation and maintenance expense related to the earnings sharing mechanism in place at WG. See Note 23, Regulatory Environment, for more information.

These decreases in operating expenses were partially offset by an $18.3 million increase in depreciation and amortization, driven by capital expenditures as we continue to execute on our capital plan, an increase related to the reduction of certain regulatory assets as a result of the PSCW's May 2018 order addressing the Tax Legislation, and additional expense recognized related to the adoption of Topic 842, as discussed in the other operation and maintenance table above.

Illinois Segment Contribution to Operating Income

Since the majority of PGL and NSG customers use natural gas for heating, operating income is sensitive to weather and is generally higher during the winter months.

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Natural gas revenues	$	242.9	$	268.0	$	(25.1	)
Cost of natural gas sold	42.8		75.3		32.5
Total natural gas margins	200.1		192.7		7.4
Other operation and maintenance	107.0		104.1		(2.9		)
Depreciation and amortization	45.0		41.8		(3.2		)
Property and revenue taxes	5.5		5.1		(0.4		)
Operating income	$	42.6	$	41.7	$	0.9

The following table shows a breakdown of other operation and maintenance:

	Three Months Ended June 30
(in millions)	2019			2018			B (W)
Operation and maintenance not included in the line items below	$	91.5		$	85.7		$	(5.8	)
Riders *	15.6			18.1			2.5
Regulatory amortizations *	(0.3		)	(0.4		)	(0.1		)
Other	0.2			0.7			0.5
Total other operation and maintenance	$	107.0		$	104.1		$	(2.9	)

* These riders and regulatory amortizations are substantially offset in margins and therefore do not have a significant impact on operating income.

06/30/2019 Form 10-Q 48 WEC Energy Group, Inc.

The following tables provide information on delivered volumes by customer class and weather statistics:

	Three Months Ended June 30
	Therms (in millions)
Natural Gas Sales Volumes	2019	2018	B (W)
Customer Class
Residential	126.7	138.4	(11.7	)
Commercial and industrial	57.4	59.5	(2.1	)
Total retail	184.1	197.9	(13.8	)
Transport	141.0	169.1	(28.1	)
Total sales in therms	325.1	367.0	(41.9	)

	Three Months Ended June 30
	Degree Days
Weather *	2019	2018	B (W)
Heating (710 Normal)	771	836	(7.8	)%

* Normal heating degree days are based on a 12-year moving average of monthly temperatures from Chicago's O'Hare Airport.

Natural Gas Utility Margins

Natural gas utility margins at the Illinois segment, net of the $2.5 million impact of the riders referenced in the table above, increased $9.9 million during the second quarter of 2019, compared with the same quarter in 2018, driven by a $7.2 million increase in revenue at PGL due to continued capital investment in the SMP project under its QIP rider. PGL currently recovers the costs related to the SMP through a surcharge on customer bills pursuant to an ICC approved QIP rider, which is in effect through 2023. See Note 23, Regulatory Environment, for more information.

Operating Income

Operating income at the Illinois segment increased $0.9 million during the second quarter of 2019, compared with the same quarter in 2018. This increase was primarily driven by the $9.9 million net increase in margins discussed above. This increase in margins was partially offset by $9.0 million of higher operating expenses (which include other operation and maintenance, depreciation and amortization, and property and revenue taxes), net of the impact of the riders referenced in the table above.

The significant factors impacting the increase in operating expenses during the second quarter of 2019, compared with the same quarter in 2018 were:

• A $3.6 million increase in natural gas maintenance costs, primarily due to the continuation of maintenance work resulting from colder than normal weather in the first quarter of 2019.

• A $3.5 million increase in benefit costs, primarily related to deferred compensation.

• A $3.2 million increase in depreciation expense, primarily driven by PGL's continued capital investment in the SMP project.

06/30/2019 Form 10-Q 49 WEC Energy Group, Inc.

Other States Segment Contribution to Operating Income

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Natural gas revenues	$	68.8	$	72.4	$	(3.6	)
Cost of natural gas sold	29.9		31.0		1.1
Total natural gas margins	38.9		41.4		(2.5		)
Other operation and maintenance	23.4		24.9		1.5
Depreciation and amortization	6.7		4.5		(2.2		)
Property and revenue taxes	4.2		3.9		(0.3		)
Operating income	$	4.6	$	8.1	$	(3.5	)

The following table shows a breakdown of other operation and maintenance:

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Operation and maintenance not included in line item below	$	18.9	$	18.9	$	—
Regulatory amortizations and other pass through expenses *	4.5		6.0		1.5
Total other operation and maintenance	$	23.4	$	24.9	$	1.5

* Regulatory amortizations and other pass through expenses are substantially offset in margins and therefore do not have a significant impact on operating income.

The following tables provide information on sales volumes by customer class and weather statistics:

	Three Months Ended June 30
	Therms (in millions)
Natural Gas Sales Volumes	2019	2018	B (W)
Customer Class
Residential	47.8	47.0	0.8
Commercial and industrial	33.1	31.3	1.8
Total retail	80.9	78.3	2.6
Transport	174.8	168.1	6.7
Total sales in therms	255.7	246.4	9.3

	Three Months Ended June 30
	Degree Days
Weather *	2019	2018	B (W)
MERC
Heating (942 Normal)	1,074	1,064	0.9	%
MGU
Heating (768 Normal)	805	858	(6.2	)%

* Normal heating degree days for MERC and MGU are based on a 20-year moving average and 15-year moving average, respectively, of monthly temperatures from various weather stations throughout their respective service territories.

Natural Gas Utility Margins

Natural gas utility margins decreased $2.5 million during the second quarter of 2019, compared to the same quarter last year. The decrease was primarily driven by lower natural gas margins related to the timing of recognition of interim rates at MERC in 2018.

06/30/2019 Form 10-Q 50 WEC Energy Group, Inc.

Operating Income

Operating income at the other states segment decreased $3.5 million during the second quarter of 2019, compared to the same quarter last year. This decrease was driven by the $2.5 million decrease in margins discussed above, as well as a $1.0 million increase in operating expenses (which include other operation and maintenance, depreciation and amortization, and property and revenue taxes). The increase in operating expenses is primarily due to the positive impact on 2018 depreciation and amortization expense of a depreciation study approved by the MPUC in the second quarter of 2018. These rates were effective retroactive to January 2017.

Non-Utility Energy Infrastructure Segment Contribution to Operating Income

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Operating income	$	91.3	$	92.4	$	(1.1	)

Corporate and Other Segment Contribution to Operating Income

	Three Months Ended June 30
(in millions)	2019			2018			B (W)
Operating loss	$	(7.1	)	$	(6.5	)	$	(0.6	)

Electric Transmission Segment Operations

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Equity in earnings of transmission affiliates	$	36.9	$	28.7	$	8.2

Earnings from our ownership interests in transmission affiliates increased $8.2 million during the second quarter of 2019, compared with the same quarter in 2018, primarily due to continued capital investment by ATC. Also contributing to the increase in our equity earnings was the impact of the refund ATC was required to provide customers in the second quarter of 2018 as a result of the FERC financial audit completed in February 2018.

Consolidated Other Income, Net

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
AFUDC – Equity	$	2.4	$	3.7	$	(1.3	)
Non-service components of net periodic benefit costs	9.6		5.3		4.3
Other, net	11.6		22.4		(10.8		)
Other income, net	$	23.6	$	31.4	$	(7.8	)

Other income, net decreased $7.8 million during the second quarter of 2019, compared with the same quarter in 2018. The decrease was primarily driven by a 2018 item that was offset in other operation and maintenance expense and had no impact on net income for the quarter. Additionally, lower gains on the investments held in the Integrys rabbi trust also contributed to the decrease. These investment gains partially offset benefits costs related to deferred compensation included in operating income. See Note 13, Fair Value Measurements, for more information on our investments held in the Integrys rabbi trust.

These decreases in other income, net were partially offset by higher net credits from the non-service components of our net periodic pension and OPEB costs. See Note 16, Employee Benefits, for more information on our pension and OPEB costs.

Consolidated Interest Expense

	Three Months Ended June 30
(in millions)	2019		2018		B (W)
Interest expense	$	124.1	$	108.5	$	(15.6	)

06/30/2019 Form 10-Q 51 WEC Energy Group, Inc.

Interest expense increased $15.6 million during the second quarter of 2019, compared with the same quarter in 2018, primarily due to higher debt balances and higher interest rates on short-term debt. The increase in debt balances is primarily related to continued capital investments.

Consolidated Income Tax Expense

	Three Months Ended June 30
	2019		2018		B (W)
Effective tax rate	6.1	%	18.1	%	12.0	%

Our effective tax rate decreased by 12.0% when compared with the second quarter of 2018, primarily due to the increased benefit from the flow through of tax repairs in connection with the Wisconsin rate settlement. Also contributing to the decrease was the impact of the Tax Legislation, an increase in wind production tax credits related to recent acquisitions of wind generation facilities in our non-utility energy infrastructure segment, and the recognition of deferred investment tax credits related to the sale of certain PDL solar power generation facilities completed during the second quarter of 2019. See Note 3, Disposition, Note 12, Income Taxes, and Note 23, Regulatory Environment, for more information.

SIX MONTHS ENDED JUNE 30, 2019

Consolidated Earnings

The following table compares our consolidated results for the six months ended June 30, 2019 with the six months ended June 30, 2018, including favorable or better, "B", and unfavorable or worse, "W", variances:

	Six Months Ended June 30
(in millions, except per share data)	2019			2018			B (W)			Change Related to Flow Through of Tax Repairs			Change Related to Adoption of New Lease Guidance (Topic 842)			Remaining Change B (W)
Wisconsin	$	632.0		$	468.8		$	163.2		$	(16.7	)	$	176.0		$	3.9
Illinois	180.5			189.3			(8.8		)	—			—			(8.8		)
Other states	46.1			44.3			1.8			—			—			1.8
Non-utility energy infrastructure	184.0			185.4			(1.4		)	—			—			(1.4		)
Corporate and other	(11.0		)	(11.9		)	0.9			—			—			0.9
Reconciling eliminations *	(174.2		)	—			(174.2		)	—			(174.2		)	—
Total operating income	857.4			875.9			(18.5		)	(16.7		)	1.8			(3.6		)
Equity in earnings of transmission affiliates	73.0			61.5			11.5			—			—			11.5
Other income, net	54.5			38.9			15.6			—			—			15.6
Interest expense	248.5			215.2			(33.3		)	—			(1.8		)	(31.5		)
Income before income taxes	736.4			761.1			(24.7		)	(16.7		)	—			(8.0		)
Income tax expense	80.2			139.4			59.2			16.7			—			42.5
Preferred stock dividends of subsidiary	0.6			0.6			—			—			—			—
Net loss attributed to noncontrolling interests	0.2			—			0.2			—			—			0.2
Net income attributed to common shareholders	$	655.8		$	621.1		$	34.7		$	—		$	—		$	34.7
Diluted Earnings Per Share	$	2.07		$	1.96		$	0.11

* We adopted ASU 2016-02, Leases (Topic 842) effective January 1, 2019, which revised the previous guidance regarding the accounting for leases. As a result of this adoption, for the six months ended June 30, 2019, $174.2 million of minimum lease payments that were billed from We Power to WE were no longer classified within operation and maintenance, but were instead recorded as interest expense in accordance with Topic 842. The We Power lease does not impact our financial statements as all amounts associated with the lease are eliminated at the consolidated level.

06/30/2019 Form 10-Q 52 WEC Energy Group, Inc.

Earnings increased $34.7 million during the six months ended June 30, 2019, compared with the same period in 2018. The table above shows the income statement impacts associated with the flow through of tax repairs beginning January 1, 2018 and the adoption of Topic 842, effective January 1, 2019. As shown in the table above, the changes related to these items had no impact on net income attributed to common shareholders. See Note 23, Regulatory Environment, for more information on the flow through of tax repairs and Note 10, Leases, for more information on the adoption of Topic 842.

The significant factors impacting the $34.7 million increase in earnings were:

• A $42.5 million remaining decrease in income tax expense, primarily due to an increase in wind production tax credits related to recent acquisitions of wind generation facilities in our non-utility energy infrastructure segment, the impact of the Tax Legislation, the recognition of deferred investment tax credits related to the sale of certain PDL solar power generation facilities completed during the second quarter of 2019, and lower income before income taxes.

• A $15.6 million increase in other income, net, driven by higher gains on the investments held in the Integrys rabbi trust and higher net credits from the non-service components of our net periodic pension and OPEB costs. The gains on the investments held in the rabbi trust partially offset benefits costs related to deferred compensation included in operating income. See Note 13, Fair Value Measurements, for more information on our investments held in the Integrys rabbi trust, and Note 16, Employee Benefits, for more information on our pension and OPEB costs.

• An $11.5 million increase in earnings from our ownership interests in transmission affiliates, primarily due to continued capital investment by ATC and the impact of the refund ATC was required to provide customers in the second quarter of 2018 as a result of the FERC financial audit completed in February 2018.

These increases in earnings were partially offset by a $31.5 million remaining increase in interest expense. The increase in interest expense was driven by higher debt balances, primarily used to fund capital investments, and higher interest rates on short-term debt.

Non-GAAP Financial Measures

The discussions below address the operating income contribution of each of our segments and include financial information prepared in accordance with GAAP, as well as electric margins and natural gas margins, which are not measures of financial performance under GAAP. Electric margin (electric revenues less fuel and purchased power costs) and natural gas margin (natural gas revenues less cost of natural gas sold) are non-GAAP financial measures because they exclude other operation and maintenance expense, depreciation and amortization, and property and revenue taxes.

We believe that electric and natural gas margins provide a useful basis for evaluating utility operations since the majority of prudently incurred fuel and purchased power costs, as well as prudently incurred natural gas costs, are passed through to customers in current rates. As a result, management uses electric and natural gas margins internally when assessing the operating performance of our segments as these measures exclude the majority of revenue fluctuations caused by changes in these expenses. Similarly, the presentation of electric and natural gas margins herein is intended to provide supplemental information for investors regarding our operating performance.

Our electric margins and natural gas margins may not be comparable to similar measures presented by other companies.  Furthermore, these measures are not intended to replace operating income as determined in accordance with GAAP as an indicator of our segment operating performance. Operating income for the six months ended June 30, 2019 and 2018 for each of our segments is presented in the “Consolidated Earnings” table above.

Each applicable segment operating income discussion below includes a table that provides the calculation of electric margins and natural gas margins, as applicable, along with a reconciliation to segment operating income.

06/30/2019 Form 10-Q 53 WEC Energy Group, Inc.

Wisconsin Segment Contribution to Operating Income

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Electric revenues	$	2,091.0	$	2,156.6	$	(65.6	)
Fuel and purchased power	649.5		680.5		31.0
Total electric margins	1,441.5		1,476.1		(34.6		)
Natural gas revenues	795.7		758.0		37.7
Cost of natural gas sold	469.0		444.6		(24.4		)
Total natural gas margins	326.7		313.4		13.3
Total electric and natural gas margins	1,768.2		1,789.5		(21.3		)
Other operation and maintenance	756.6		970.9		214.3
Depreciation and amortization	303.9		269.7		(34.2		)
Property and revenue taxes	75.7		80.1		4.4
Operating income	$	632.0	$	468.8	$	163.2

The following table shows a breakdown of other operation and maintenance:

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Operation and maintenance not included in line items below	$	331.0	$	365.4	$	34.4
We Power (1)	70.1		253.1		183.0
Transmission (2)	209.4		209.2		(0.2		)
Transmission expense related to the flow through of tax repairs (3)	31.8		24.7		(7.1		)
Transmission expense related to Tax Legislation (4)	32.7		33.8		1.1
Regulatory amortizations and other pass through expenses (5)	81.6		81.0		(0.6		)
Earnings sharing mechanism (6)	—		3.7		3.7
Total other operation and maintenance	$	756.6	$	970.9	$	214.3

⁽¹⁾  Represents costs associated with the We Power generation units, including operating and maintenance costs recognized by WE. For the six months ended June 30, 2018, the amount also included the lease payments that were billed from We Power to WE and then recovered in WE's rates. We adopted ASU 2016-02, Leases (Topic 842) effective January 1, 2019, which revised the previous guidance regarding the accounting for leases. As a result of this adoption, for the six months ended June 30, 2019, $182.4 million of lease expense related to the We Power leases with WE was no longer classified within other operation and maintenance, but was instead recorded as $8.2 million and $174.2 million of depreciation and amortization and interest expense, respectively, in accordance with Topic 842. The We Power lease does not impact our financial statements as all amounts associated with the lease are eliminated at the consolidated level.

During the six months ended June 30, 2019, $76.4 million of operating and maintenance costs were billed to or incurred by WE related to the We Power generation units, with the difference in costs billed or incurred and expenses recognized, either deferred or deducted from the regulatory asset. During the six months ended June 30, 2018, $236.7 million of both lease and operating and maintenance costs were billed to or incurred by WE related to the We Power generation units, with the difference in costs billed or incurred and expenses recognized, either deferred or deducted from the regulatory asset.

⁽²⁾  Represents transmission expense that we are authorized to collect in rates, in accordance with the PSCW's approval of escrow accounting for ATC and MISO network transmission expenses for our Wisconsin electric utilities. As a result, WE and WPS defer as a regulatory asset or liability the difference between actual transmission costs and those included in rates until recovery or refund is authorized in a future rate proceeding. During the six months ended June 30, 2019 and 2018, $238.1 million and $191.6 million, respectively, of costs were billed to our electric utilities by transmission providers.

⁽³⁾  Represents additional transmission expense associated with WE's flow through of tax benefits of its repair-related deferred tax liabilities starting in 2018 in accordance with a settlement agreement with the PSCW, to maintain certain regulatory asset balances at their December 31, 2017 levels. See Note 23, Regulatory Environment, for more information.

⁽⁴⁾  Represents additional transmission expense associated with the May 2018 PSCW order requiring WE to use 80% of its current 2018 tax benefit, including the amortization associated with the revaluation of deferred taxes, to reduce its transmission regulatory asset balance.

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⁽⁵⁾  Regulatory amortizations and other pass through expenses are substantially offset in margins and therefore do not have a significant impact on operating income.

⁽⁶⁾  See Note 23, Regulatory Environment, for more information about our earnings sharing mechanisms.

The following tables provide information on sales volumes by customer class and weather statistics:

	Six Months Ended June 30
	MWh (in thousands)
Electric Sales Volumes	2019	2018	B (W)
Customer Class
Residential	5,147.5	5,282.5	(135.0	)
Small commercial and industrial *	6,235.9	6,415.3	(179.4	)
Large commercial and industrial *	6,241.9	6,376.7	(134.8	)
Other	84.2	84.3	(0.1	)
Total retail *	17,709.5	18,158.8	(449.3	)
Wholesale	1,664.5	1,732.8	(68.3	)
Resale	3,144.7	3,236.7	(92.0	)
Total sales in MWh *	22,518.7	23,128.3	(609.6	)

* Includes distribution sales for customers who have purchased power from an alternative electric supplier in Michigan.

	Six Months Ended June 30
	Therms (in millions)
Natural Gas Sales Volumes	2019	2018	B (W)
Customer Class
Residential	747.2	693.8	53.4
Commercial and industrial	446.2	438.7	7.5
Total retail	1,193.4	1,132.5	60.9
Transport	752.1	735.2	16.9
Total sales in therms	1,945.5	1,867.7	77.8

	Six Months Ended June 30
	Degree Days
Weather	2019	2018	B (W)
WE and WG (1)
Heating (4,192 normal)	4,456	4,248	4.9	%
Cooling (166 normal)	76	217	(65.0	)%
WPS (2)
Heating (4,597 normal)	4,881	4,717	3.5	%
Cooling (136 normal)	78	215	(63.7	)%
UMERC (3)
Heating (5,131 normal)	5,637	5,242	7.5	%
Cooling (79 normal)	49	138	(64.5	)%

⁽¹⁾  Normal degree days are based on a 20-year moving average of monthly temperatures from Mitchell International Airport in Milwaukee, Wisconsin.

⁽²⁾  Normal degree days are based on a 20-year moving average of monthly temperatures from the Green Bay, Wisconsin weather station.

⁽³⁾  Normal degree days are based on a 20-year moving average of monthly temperatures from the Iron Mountain, Michigan weather station.

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Electric Utility Margins

Electric utility margins at the Wisconsin segment decreased $34.6 million during the six months ended June 30, 2019, compared with the same period in 2018. The significant factors impacting the lower electric utility margins were:

• A $27.6 million decrease related to lower retail sales volumes during the six months ended June 30, 2019, primarily driven by unfavorable weather during the second quarter of 2019. As measured by cooling degree days, the six months ended June 30, 2019, were 65.0% and 63.7% cooler than the same period in 2018 in the Milwaukee area and Green Bay area, respectively.

• A $9.6 million decrease in margins associated with WE's flow through of tax benefits of its repair-related deferred tax liabilities starting in 2018 in accordance with a settlement agreement with the PSCW to maintain certain regulatory assets at their December 31, 2017 levels. See Note 23, Regulatory Environment, for more information.

Natural Gas Utility Margins

Natural gas utility margins at the Wisconsin segment increased $13.3 million during the six months ended June 30, 2019, compared with the same period in 2018. The most significant factor impacting the higher natural gas utility margins was higher sales volumes, primarily driven by colder winter weather, customer growth, and higher use per residential customer during the six months ended June 30, 2019, compared with the same period in 2018.

Operating Income

Operating income at the Wisconsin segment increased $163.2 million during the six months ended June 30, 2019, compared with the same period in 2018. This increase was driven by $184.5 million of lower operating expenses (which include other operation and maintenance, depreciation and amortization, and property and revenue taxes), partially offset by the $21.3 million net decrease in margins discussed above.

The significant factors impacting the decrease in operating expenses during the six months ended June 30, 2019, compared with the same period in 2018, were:

• A $182.4 million decrease in other operation and maintenance resulting from the adoption of the new lease guidance. As discussed in the other operation and maintenance table above, the adoption of Topic 842, effective January 1, 2019, required WE to change the income statement classification of its lease payments related to the We Power leases. For the six months ended June 30, 2019, the minimum lease payments that were billed from We Power to WE were no longer classified within other operation and maintenance, but were instead recorded as a component of depreciation and amortization and interest expense in accordance with Topic 842.

• A $32.1 million decrease in operation and maintenance expenses across all of our plants, in part due to the retirements of the Pleasant Prairie power plant in April 2018, Edgewater Unit 4 in September 2018, Pulliam Units 7 and 8 in October 2018, and the PIPP in March 2019. This resulted in lower maintenance and labor costs during the six months ended June 30, 2019. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP.

• A $9.9 million decrease in operation and maintenance expense due to a 2018 item that was offset in other income, net and had no impact on net income for the six months ended June 30, 2019.

• A $3.7 million decrease in operation and maintenance expense related to the earnings sharing mechanism in place at WG. See Note 23, Regulatory Environment, for more information.

These decreases in operating expenses were partially offset by:

• A $34.2 million increase in depreciation and amortization, driven by capital expenditures as we continue to execute on our capital plan, an increase related to the reduction of certain regulatory assets as a result of the PSCW's May 2018 order addressing the Tax legislation, and additional expense recognized related to the adoption of Topic 842, as discussed in the other operation and maintenance table above.

• A $22.7 million increase in benefit costs, primarily related to deferred compensation.

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• A $7.1 million increase in transmission expense related to the flow through of tax repairs, as discussed in the other operation and maintenance table above.

Illinois Segment Contribution to Operating Income

Since the majority of PGL and NSG customers use natural gas for heating, operating income is sensitive to weather and is generally higher during the winter months.

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Natural gas revenues	$	779.4	$	775.3	$	4.1
Cost of natural gas sold	262.6		277.0		14.4
Total natural gas margins	516.8		498.3		18.5
Other operation and maintenance	235.2		216.3		(18.9		)
Depreciation and amortization	89.5		82.7		(6.8		)
Property and revenue taxes	11.6		10.0		(1.6		)
Operating income	$	180.5	$	189.3	$	(8.8	)

The following table shows a breakdown of other operation and maintenance:

	Six Months Ended June 30
(in millions)	2019			2018			B (W)
Operation and maintenance not included in the line items below	$	179.5		$	159.4		$	(20.1	)
Riders *	56.1			56.6			0.5
Regulatory amortizations *	(0.7		)	(0.7		)	—
Other	0.3			1.0			0.7
Total other operation and maintenance	$	235.2		$	216.3		$	(18.9	)

* These riders and regulatory amortizations are substantially offset in margins and therefore do not have a significant impact on operating income.

The following tables provide information on sales volumes by customer class and weather statistics:

	Six Months Ended June 30
	Therms (in millions)
Natural Gas Sales Volumes	2019	2018	B (W)
Customer Class
Residential	575.7	567.0	8.7
Commercial and industrial	232.3	227.9	4.4
Total retail	808.0	794.9	13.1
Transport	528.9	525.7	3.2
Total sales in therms	1,336.9	1,320.6	16.3

	Six Months Ended June 30
	Degree Days
Weather *	2019	2018	B (W)
Heating (3,878 Normal)	4,158	3,949	5.3	%

* Normal heating degree days are based on a 12-year moving average of monthly temperatures from Chicago's O'Hare Airport.

Natural Gas Utility Margins

Natural gas utility margins at the Illinois segment, net of the $0.5 million impact of the riders referenced in the table above, increased $19.0 million during the six months ended June 30, 2019, compared with the same period in 2018, driven by a $15.3 million increase in revenue at PGL due to continued capital investment in the SMP project under its QIP rider. PGL currently recovers the costs related

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to the SMP through a surcharge on customer bills pursuant to an ICC approved QIP rider, which is in effect through 2023. See Note 23, Regulatory Environment, for more information.

Operating Income

Operating income at the Illinois segment decreased $8.8 million during the six months ended June 30, 2019, compared with the same period in 2018. This decrease was driven by a $27.8 million increase in operating expenses (which include other operation and maintenance, depreciation and amortization, and property and revenue taxes), net of the impact of the riders referenced in the table above. This increase in operating expenses was partially offset by the $19.0 million net increase in margins discussed above.

The significant factors impacting the increase in operating expenses during the six months ended June 30, 2019, compared with the same period in 2018 were:

• A $10.5 million increase in benefit costs, primarily related to deferred compensation.

• An $8.8 million increase in natural gas maintenance costs, primarily due to maintenance work resulting from colder than normal weather during the six months ended June 30, 2019, compared with the same period in 2018.

• A $6.8 million increase in depreciation expense, primarily driven by PGL's continued capital investment in the SMP project.

Other States Segment Contribution to Operating Income

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Natural gas revenues	$	254.0	$	242.3	$	11.7
Cost of natural gas sold	135.4		127.4		(8.0		)
Total natural gas margins	118.6		114.9		3.7
Other operation and maintenance	51.0		51.5		0.5
Depreciation and amortization	13.2		11.1		(2.1		)
Property and revenue taxes	8.3		8.0		(0.3		)
Operating income	$	46.1	$	44.3	$	1.8

The following table shows a breakdown of other operation and maintenance:

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Operation and maintenance not included in line item below	$	37.7	$	36.3	$	(1.4	)
Regulatory amortizations and other pass through expenses *	13.3		15.2		1.9
Total other operation and maintenance	$	51.0	$	51.5	$	0.5

* Regulatory amortizations and other pass through expenses are substantially offset in margins and therefore do not have a significant impact on operating income.

The following tables provide information on sales volumes by customer class and weather statistics:

	Six Months Ended June 30
	Therms (in millions)
Natural Gas Sales Volumes	2019	2018	B (W)
Customer Class
Residential	219.8	217.4	2.4
Commercial and industrial	144.1	135.1	9.0
Total retail	363.9	352.5	11.4
Transport	403.5	392.3	11.2
Total sales in therms	767.4	744.8	22.6

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	Six Months Ended June 30
	Degree Days
Weather *	2019	2018	B (W)
MERC
Heating (4,843 Normal)	5,456	5,149	6.0	%
MGU
Heating (3,974 Normal)	4,103	3,993	2.8	%

* Normal heating degree days for MERC and MGU are based on a 20-year moving average and 15-year moving average, respectively, of monthly temperatures from various weather stations throughout their respective service territories.

Natural Gas Utility Margins

Natural gas utility margins increased $3.7 million during the six months ended June 30, 2019, compared to the same period in 2018. The increase was primarily driven by higher sales volumes as a result of colder winter weather and customer growth.

Operating Income

Operating income at the other states segment increased $1.8 million during the six months ended June 30, 2019, compared with the same period in 2018. The increase was driven by the $3.7 million increase in margins discussed above, partially offset by a $1.9 million increase in operating expenses (which include other operation and maintenance, depreciation and amortization, and property and revenue taxes). The increase in operating expenses is primarily due to the positive impact on 2018 depreciation and amortization expense of a depreciation study approved by the MPUC in the second quarter of 2018. These rates were effective retroactive to January 2017.

Non-Utility Energy Infrastructure Segment Contribution to Operating Income

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Operating income	$	184.0	$	185.4	$	(1.4	)

Corporate and Other Segment Contribution to Operating Income

	Six Months Ended June 30
(in millions)	2019			2018			B (W)
Operating loss	$	(11.0	)	$	(11.9	)	$	0.9

Electric Transmission Segment Operations

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Equity in earnings of transmission affiliates	$	73.0	$	61.5	$	11.5

Earnings from our ownership interests in transmission affiliates increased $11.5 million during the six months ended June 30, 2019, compared with the same period in 2018, primarily due to continued capital investment by ATC. Also contributing to the increase in our equity earnings was the impact of the refund ATC was required to provide customers in the second quarter of 2018 as a result of the FERC financial audit completed in February 2018.

Consolidated Other Income, Net

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
AFUDC – Equity	$	7.3	$	7.0	$	0.3
Non-service components of net periodic benefit costs	17.9		12.5		5.4
Other, net	29.3		19.4		9.9
Other income, net	$	54.5	$	38.9	$	15.6

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Other income, net increased $15.6 million during the six months ended June 30, 2019, compared with the same period in 2018. The increase was primarily driven by higher gains on the investments held in the Integrys rabbi trust. These investment gains partially offset benefits costs related to deferred compensation included in operating income. See Note 13, Fair Value Measurements, for more information on our investments held in the Integrys rabbi trust. Also contributing to the increase in other income were higher net credits from the non-service components of our net periodic pension and OPEB costs. See Note 16, Employee Benefits, for more information on our pension and OPEB costs.

Consolidated Interest Expense

	Six Months Ended June 30
(in millions)	2019		2018		B (W)
Interest expense	$	248.5	$	215.2	$	(33.3	)

Interest expense increased $33.3 million during the six months ended June 30, 2019, compared with the same period in 2018, primarily due to higher debt balances and higher interest rates on short-term debt. This increase in debt balances is primarily related to continued capital investments.

Consolidated Income Tax Expense

	Six Months Ended June 30
	2019		2018		B (W)
Effective tax rate	10.9	%	18.3	%	7.4	%

Our effective tax rate decreased by 7.4% when compared with the six months ended June 30, 2018, primarily due to the increased benefit from the flow through of tax repairs in connection with the Wisconsin rate settlement, an increase in wind production tax credits related to recent acquisitions of wind generation facilities in our non-utility energy infrastructure segment, the impact of the Tax Legislation, and the recognition of deferred investment tax credits related to the sale of certain PDL solar power generation facilities completed during the second quarter of 2019. See Note 3, Disposition, Note 12, Income Taxes, and Note 23, Regulatory Environment, for more information.

We expect our 2019 annual effective tax rate to be between 10.5% and 11.5%, which includes an estimated 9.5% effective tax rate benefit due to the flow through of tax repairs in connection with the Wisconsin rate settlement. Excluding the impact of the tax repairs, the expected 2019 effective tax rate would be between 20% and 21%.

LIQUIDITY AND CAPITAL RESOURCES

Cash Flows

The following table summarizes our cash flows during the six months ended June 30:

(in millions)	2019			2018			Change in 2019 Over 2018
Cash provided by (used in):
Operating activities	$	1,291.2		$	1,513.4		$	(222.2	)
Investing activities	(1,066.4		)	(996.8		)	(69.6		)
Financing activities	(280.2		)	(523.2		)	243.0

Operating Activities

Net cash provided by operating activities decreased $222.2 million during the six months ended June 30, 2019, compared with the same period in 2018, driven by:

• A $222.1 million decrease in cash from higher payments for other operation and maintenance expenses. During the six months ended June 30, 2019, our payments were higher for accounts payable, transmission, and benefits, compared with the same period in 2018.

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• A $48.0 million decrease in cash due to higher collateral requirements during the six months ended June 30, 2019, compared with the same period in 2018, driven by an increase in our derivative liabilities.

• A $32.3 million decrease in cash due to an increase in payments for interest related to higher long-term debt balances and higher interest rates on short-term debt during the six months ended June 30, 2019, compared with the same period in 2018.

These decreases in net cash provided by operating activities were partially offset by:

• A $32.5 million net increase in cash paid for income taxes during the six months ended June 30, 2019, compared with the same period in 2018. This increase in cash was primarily due to the uncertainty of bonus depreciation eligibility for our regulated utilities as a result of the Tax Legislation which, increased our 2017 extension payment made in 2018.

• A $29.6 million increase in cash primarily related to lower payments for fuel and purchased power during the six months ended June 30, 2019, compared with the same period in 2018, due to the retirements of the Pleasant Prairie power plant in April 2018, Edgewater Unit 4 in September 2018, Pulliam Units 7 and 8 in October 2018, and the PIPP in March 2019.

Investing Activities

Net cash used in investing activities increased $69.6 million during the six months ended June 30, 2019, compared with the same period in 2018. The increase in net cash used in investing activities was driven by the acquisition of an 80% ownership interest in Upstream in January 2019 for $268.2 million, which is net of cash and restricted cash acquired of $9.2 million. See Note 2, Acquisitions, for more information.

This increase in net cash used in investing activities was partially offset by:

• The acquisition of Forward Wind Energy Center in April 2018 for $77.1 million. See Note 2, Acquisitions, for more information.

• A $60.3 million decrease in cash paid for capital expenditures during the six months ended June 30, 2019, compared with the same period in 2018, which is discussed in more detail below.

• A $32.4 million increase in cash related to a reimbursement from ATC for construction costs during the six months ended June 30, 2019. See Note 18, Investment in Transmission Affiliates, for more information.

• A $22.1 million increase in proceeds received from the sale of assets and businesses during the six months ended June 30, 2019, compared with the same period in 2018. See Note 3, Disposition, for more information on the sale of the three power generation facilities previously owned by PDL.

Capital Expenditures

Capital expenditures by segment for the six months ended June 30 were as follows:

Reportable Segment (in millions)	2019		2018		Change in 2019 Over 2018
Wisconsin	$	541.2	$	612.3	$	(71.1	)
Illinois	242.5		228.1		14.4
Other states	45.0		35.9		9.1
Non-utility energy infrastructure	19.7		16.7		3.0
Corporate and other	6.8		22.5		(15.7		)
Total capital expenditures	$	855.2	$	915.5	$	(60.3	)

The decrease in cash paid for capital expenditures at the Wisconsin segment during the six months ended June 30, 2019, compared with the same period in 2018, was primarily driven by the implementation of an enterprise resource planning system, our AMI program and various other software projects, projects at the OCPP, and upgrades to WE's electric distribution system during the six months ended June 30, 2018. These decreases in cash paid for capital expenditures were partially offset by increased capital expenditures related to upgrades to WPS's natural gas distribution system and an information technology project created to improve WE's and WG's billing, call center, and credit collection functions during the six months ended June 30, 2019.

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The increase in cash paid for capital expenditures at the Illinois segment during the six months ended June 30, 2019, compared with the same period in 2018, was driven by an increase in facilities projects at PGL during the six months ended June 30, 2019.

The decrease in cash paid for capital expenditures at the corporate and other segment during the six months ended June 30, 2019, compared with the same period in 2018, was primarily driven by the implementation of an enterprise resource planning system during the six months ended June 30, 2018.

See Capital Resources and Requirements – Capital Requirements – Significant Capital Projects for more information.

Financing Activities

Net cash used in financing activities decreased $243.0 million during the six months ended June 30, 2019, compared with the same period in 2018, driven by:

• A $664.1 million increase in cash related to lower long-term debt repayments during the six months ended June 30, 2019, compared with the same period in 2018.

• A $45.0 million increase in cash from stock options exercised during the six months ended June 30, 2019, compared with the same period in 2018.

These increases in cash were partially offset by:

• A $250.0 million decrease in cash due to lower issuances of long-term debt during the six months ended June 30, 2019, compared with the same period in 2018.

• A $102.8 million decrease in cash related to higher net repayments of commercial paper during the six months ended June 30, 2019, compared with the same period in 2018.

• An $86.5 million decrease in cash due to an increase in shares of our common stock purchased during the six months ended June 30, 2019, compared with the same period in 2018, to satisfy requirements of our stock-based compensation plans.

• A $23.6 million decrease in cash due to higher dividends paid on our common stock during the six months ended June 30, 2019, compared with the same period in 2018. In January 2019, our Board of Directors increased our quarterly dividend by $0.0375 per share (6.79%) effective with the first quarter of 2019 dividend payment.

Significant Financing Activities

For more information on our financing activities, see Note 8, Short-Term Debt and Lines of Credit, and Note 9, Long-Term Debt.

Capital Resources and Requirements

Capital Resources

Liquidity

We anticipate meeting our capital requirements for our existing operations through internally generated funds and short-term borrowings, supplemented by the issuance of intermediate or long-term debt securities, depending on market conditions and other factors.

We currently have access to the capital markets and have been able to generate funds internally and externally to meet our capital requirements. Our ability to attract the necessary financial capital at reasonable terms is critical to our overall strategic plan. We currently believe that we have adequate capacity to fund our operations for the foreseeable future through our existing borrowing arrangements, access to capital markets, and internally generated cash.

WEC Energy Group, WE, WG, WPS, and PGL maintain bank back-up credit facilities, which provide liquidity support for each company's obligations with respect to commercial paper and for general corporate purposes. We review our bank back-up credit

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facility needs on an ongoing basis and expect to be able to maintain adequate credit facilities to support our operations. See Note 8, Short-Term Debt and Lines of Credit, for more information about these credit facilities.

The following table shows our capitalization structure as of June 30, 2019, as well as an adjusted capitalization structure that we believe is consistent with how a majority of the rating agencies currently view our 2007 Junior Notes:

(in millions)	Actual			Adjusted
Common shareholders' equity	$	10,016.2		$	10,266.2
Preferred stock of subsidiary	30.4			30.4
Long-term debt (including current portion)	10,687.5			10,437.5
Short-term debt	1,262.7			1,262.7
Total capitalization	$	21,996.8		$	21,996.8
Total debt	$	11,950.2		$	11,700.2
Ratio of debt to total capitalization	54.3		%	53.2		%

Included in long-term debt on our balance sheet as of June 30, 2019, is $500.0 million principal amount of the 2007 Junior Notes. The adjusted presentation attributes $250.0 million of the 2007 Junior Notes to common shareholders' equity and $250.0 million to long-term debt.

The adjusted presentation of our consolidated capitalization structure is included as a complement to our capitalization structure presented in accordance with GAAP. Management evaluates and manages our capitalization structure, including our total debt to total capitalization ratio, using the GAAP calculation as adjusted by the rating agency treatment of the 2007 Junior Notes. Therefore, we believe the non-GAAP adjusted presentation reflecting this treatment is useful and relevant to investors in understanding how management and the rating agencies evaluate our capitalization structure.

Working Capital

As of June 30, 2019, our current liabilities exceeded our current assets by $1,523.3 million. We do not expect this to have any impact on our liquidity since we believe we have adequate back-up lines of credit in place for our ongoing operations. We also believe that we can access the capital markets to finance our construction programs and to refinance current maturities of long-term debt, if necessary.

Credit Rating Risk

We do not have any credit agreements that would require material changes in payment schedules or terminations as a result of a credit rating downgrade. However, we have certain agreements in the form of commodity contracts and employee benefit plans that could require collateral or a termination payment in the event of a credit rating change to below BBB- at S&P Global Ratings and/or Baa3 at Moody's Investors Service. We also have other commodity contracts that, in the event of a credit rating downgrade, could result in a reduction of our unsecured credit granted by counterparties.

In addition, access to capital markets at a reasonable cost is determined in large part by credit quality. Any credit ratings downgrade could impact our ability to access capital markets.

Subject to other factors affecting the credit markets as a whole, we believe our current ratings should provide a significant degree of flexibility in obtaining funds on competitive terms. However, these security ratings reflect the views of the rating agency only. An explanation of the significance of these ratings may be obtained from the rating agency. Such ratings are not a recommendation to buy, sell, or hold securities. Any rating can be revised upward or downward or withdrawn at any time by a rating agency.

If we are unable to successfully take actions to manage any additional adverse impacts of the Tax Legislation, or if additional interpretations, regulations, amendments or technical corrections exacerbate the adverse impacts of the Tax Legislation, the legislation could result in credit rating agencies placing our or our subsidiaries’ credit ratings on negative outlook or additional downgrading of our or our subsidiaries' credit ratings. Any such actions by credit rating agencies may make it more difficult and costly for us and our subsidiaries to issue future debt securities and certain other types of financing and could increase borrowing costs under our and our subsidiaries’ credit facilities.

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Capital Requirements

Significant Capital Projects

We have several capital projects that will require significant capital expenditures over the next three years and beyond. All projected capital requirements are subject to periodic review and may vary significantly from estimates, depending on a number of factors. These factors include environmental requirements, regulatory restraints and requirements, impacts from the Tax Legislation, additional changes in tax laws and regulations, acquisition and development opportunities, market volatility, and economic trends. Our estimated capital expenditures and acquisitions for the next three years are as follows:

(in millions)	2019		2020		2021
Wisconsin	$	1,344.9	$	1,677.5	$	1,559.1
Illinois	765.2		684.0		602.4
Other states	155.4		135.8		105.5
Non-utility energy infrastructure	424.2		418.8		242.8
Corporate and other	15.7		11.0		1.1
Total	$	2,705.4	$	2,927.1	$	2,510.9

WPS is continuing work on the SMRP. This project includes modernizing parts of its electric distribution system, including burying or upgrading lines. The project focuses on constructing facilities to improve the reliability of electric service WPS provides to its customers. WPS expects to invest approximately $185 million between 2019 and 2021 on this project. WE, WPS, and WG will also continue to upgrade their electric and natural gas distribution systems to enhance reliability. These upgrades include the AMI program. AMI is an integrated system of smart meters, communication networks and data management systems that enable two-way communication between utilities and customers.

As part of our commitment to invest in zero-carbon generation, we plan to invest in utility scale solar of up to 350 MW within our Wisconsin segment. WPS has partnered with an unaffiliated utility to acquire ownership interests in two proposed solar projects in Wisconsin. Badger Hollow I will be located in Iowa County, Wisconsin, and Two Creeks Solar Project will be located in Manitowoc County, Wisconsin. WPS will own 100 MW of the output of each project for a total of 200 MW. WPS's share of the cost of both projects is estimated to be $260 million. Commercial operation for both projects is targeted for the end of 2020. WE has partnered with an unaffiliated utility to acquire an ownership interest in Badger Hollow II, a solar project that will be located in Iowa County, Wisconsin. WE will own 100 MW of the output of the project. WE's share of the cost of this project is estimated to be $130 million. Commercial operation is targeted for the end of 2021. Solar generation technology has greatly improved, has become more cost-effective, and it complements our summer demand curve.

In connection with the formation of UMERC, we entered into an agreement with Tilden under which it will purchase electric power from UMERC for 20 years, contingent upon UMERC's construction of approximately 180 MW of natural gas-fired generation in the Upper Peninsula of Michigan. The new generation began commercial operation on March 31, 2019. The estimated cost of this project is approximately $242 million ($255 million including AFUDC), 50% of which is expected to be recovered from Tilden, with the remaining 50% expected to be recovered from UMERC's other utility customers.

PGL is continuing work on the SMP, a project under which PGL is replacing approximately 2,000 miles of Chicago's aging natural gas pipeline infrastructure. PGL currently recovers these costs through a surcharge on customer bills pursuant to an ICC approved QIP rider, which is in effect through 2023. PGL's projected average annual investment through 2021 is between $280 million and $300 million. See Note 23, Regulatory Environment, for more information on the SMP.

The non-utility energy infrastructure line item in the table above includes our investments in Coyote Ridge and Upstream. See Note 2, Acquisitions, for more information on these wind projects.

We expect to provide total capital contributions to ATC and ATC Holdco (not included in the above table) of approximately $185 million from 2019 through 2021.

Common Stock Dividends

Our current quarterly dividend rate is $0.59 per share, which equates to an annual dividend of $2.36 per share. For information related to our most recent common stock dividend declared, see Note 7, Common Equity.

06/30/2019 Form 10-Q 64 WEC Energy Group, Inc.

Off-Balance Sheet Arrangements

We are a party to various financial instruments with off-balance sheet risk as a part of our normal course of business, including financial guarantees and letters of credit that support construction projects, commodity contracts, and other payment obligations. We believe that these agreements do not have, and are not reasonably likely to have, a current or future material effect on our financial condition, changes in financial condition, revenues or expenses, results of operations, liquidity, capital expenditures, or capital resources. For additional information, see Note 8, Short-Term Debt and Lines of Credit, Note 15, Guarantees, and Note 20, Variable Interest Entities.

Contractual Obligations

For information about our commitments, see Contractual Obligations in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations – Capital Resources and Requirements in our 2018 Annual Report on Form 10-K. There were no material changes to our commitments outside the ordinary course of business during the six months ended June 30, 2019.

FACTORS AFFECTING RESULTS, LIQUIDITY, AND CAPITAL RESOURCES

The following is a discussion of certain factors that may affect our results of operations, liquidity, and capital resources. The following discussion should be read together with the information in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations – Factors Affecting Results, Liquidity, and Capital Resources in our 2018 Annual Report on Form 10-K, which provides a more complete discussion of factors affecting us, including market risks and other significant risks, competitive markets, environmental matters, critical accounting policies and estimates, and other matters.

Market Risks and Other Significant Risks

We are exposed to market and other significant risks as a result of the nature of our businesses and the environments in which those businesses operate. These risks include, but are not limited to, the regulatory recovery risk described below. See Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations – Factors Affecting Results, Liquidity, and Capital Resources – Market Risks and Other Significant Risks in our 2018 Annual Report on Form 10-K for a discussion of other significant risks applicable to us.

Regulatory Recovery

Regulated entities are allowed to defer certain costs that would otherwise be charged to expense if the regulated entity believes the recovery of those costs is probable. We record regulatory assets pursuant to specific orders or by a generic order issued by our regulators. Recovery of the deferred costs in future rates is subject to the review and approval by those regulators. We assume the risks and benefits of ultimate recovery of these items in future rates. If the recovery of the deferred costs, including those referenced below, is not approved by our regulators, the costs would be charged to income in the current period. Regulators can impose liabilities on a prospective basis for amounts previously collected from customers and for amounts that are expected to be refunded to customers. We record these items as regulatory liabilities.

Due to the Tax Legislation signed into law in December 2017, our regulated utilities remeasured their deferred taxes and recorded a tax benefit of $2,529 million. Our utilities have been returning the amortization of this tax benefit to ratepayers through refunds, bill credits, riders, and reductions to other regulatory assets, which we expect to continue.

We expect to request or have requested recovery of the costs related to the following projects in recent or pending rate proceedings, orders, and investigations involving our utilities:

• In June 2016, the PSCW approved the deferral of costs related to WPS's ReACT™ project above the originally authorized $275.0 million level through 2017. The total cost of the ReACT™ project, excluding $51 million of AFUDC, was $342 million. In September 2017, the PSCW approved an extension of this deferral through 2019 as part of a settlement agreement. WPS cannot collect these deferred costs without prior approval from the PSCW. WPS has requested approval for collection of these deferred costs in the rate proposal it filed with the PSCW in March 2019. See Note 23, Regulatory Environment, for more information.

• Prior to its acquisition by us, Integrys initiated an information technology project with the goal of improving the customer experience at its subsidiaries. Specifically, the project is expected to provide functional and technological benefits to the billing,

06/30/2019 Form 10-Q 65 WEC Energy Group, Inc.

call center, and credit collection functions. As of June 30, 2019, we had not received any significant disallowances of the costs incurred for this project. We will be required to obtain approval for the recovery of additional costs incurred through the completion of this long-term project. WPS has requested recovery of these costs in the rate proposal it filed with the PSCW in March 2019.

• In January 2014, the ICC approved PGL's use of the QIP rider as a recovery mechanism for costs incurred related to investments in QIP. This rider is subject to an annual reconciliation whereby costs are reviewed for accuracy and prudency. In March 2019, PGL filed its 2018 reconciliation with the ICC, which, along with the 2017 and 2016 reconciliations, are still pending. In June 2019, PGL agreed to a settlement of the 2015 reconciliation, which includes a rate base reduction of $7.0 million and a $7.3 million refund to ratepayers. The ICC approved the settlement on July 17, 2019. It will not have a material impact on earnings. As of June 30, 2019, there can be no assurance that all costs incurred under the QIP rider during the open reconciliation years will be deemed recoverable by the ICC.

See Note 23, Regulatory Environment, for more information regarding our pending rate proceedings, previously issued rate orders, and investigations involving our utilities.

Environmental Matters

See Note 21, Commitments and Contingencies, for a discussion of certain environmental matters affecting us, including rules and regulations relating to air quality, water quality, land quality, and climate change.

Other Matters

Tax Cuts and Jobs Act of 2017

In December 2017, the Tax Legislation was signed into law. In 2018 and 2019, the PSCW and the MPSC issued written orders regarding how to refund certain tax savings from the Tax Legislation to our ratepayers in Wisconsin and Michigan, respectively. We expect that the various remaining impacts of the Tax Legislation on our Wisconsin operations will be addressed in the pending rate case we filed with the PSCW in March 2019. In addition, the ICC approved the Variable Income Tax Adjustment Rider in Illinois during April 2018, and, in Minnesota, the MPUC included the various impacts of the Tax Legislation in MERC's final 2018 rate order. In July 2019, the FERC approved WPS's formula rate tariff, which incorporated the impact of the Tax Legislation. Formula rate customers of WPS will receive a monthly bill credit through the end of 2019, which will include the customer's tax savings, including interest. We are also working with the FERC to modify WE's formula rate tariffs for the impacts of the Tax Legislation, and we expect to receive FERC approval for the modified tariffs in 2019. See Note 23, Regulatory Environment, for more information.

American Transmission Company Allowed Return on Equity Complaints

In November 2013, a group of MISO industrial customer organizations filed a complaint with the FERC requesting to reduce the base ROE used by MISO transmission owners, including ATC, from 12.2% to 9.15%. In October 2014, the FERC issued an order to hear the complaint on ROE and set a refund effective date retroactive to November 2013. In December 2015, the ALJ issued an initial decision recommending that ATC and all other MISO transmission owners be authorized to collect a base ROE of 10.32%, as well as the 0.5% incentive adder approved by the FERC in January 2015 for MISO transmission owners. The incentive adder only applies to revenues collected after January 6, 2015. In September 2016, the FERC issued an order related to this complaint affirming the use of the ROE stated in the ALJ's initial decision, effective as of the order date, on a going-forward basis. The order also required ATC to provide refunds, with interest, for the 15-month refund period from November 12, 2013, through February 11, 2015. The $28.3 million refund that ATC provided to WE and WPS for transmission costs paid during the refund period reduced the regulatory assets recorded under the PSCW-approved escrow accounting for transmission expense and resulted in a net regulatory liability for WPS.

In February 2015, a second complaint was filed with the FERC requesting a reduction in the base ROE used by MISO transmission owners, including ATC, to 8.67%, with a refund effective date retroactive to February 12, 2015. In June 2016, the ALJ issued an initial decision recommending that ATC and all other MISO transmission owners be authorized to collect a base ROE of 9.7%, as well as the 0.5% incentive adder approved for MISO transmission owners. The ALJ's initial decision is not binding on the FERC and applies to revenues collected from February 12, 2015, through May 11, 2016. We are uncertain when a FERC order related to this matter will be issued.

06/30/2019 Form 10-Q 66 WEC Energy Group, Inc.

The MISO transmission owners have filed various appeals related to several of the FERC orders with the United States Court of Appeals for the District of Columbia Circuit as well as requests for rehearing.

In November 2018, the FERC issued an order directing MISO transmission owners, including ATC, to submit briefs on a proposed change to the methodology used to calculate their base ROE. In March 2019, the FERC issued two new orders expanding its ROE inquiries to solicit comments from all potential stakeholders, including those outside of MISO. If the proposed methodology is approved, ATC’s base ROE for the period from November 12, 2013 through February 11, 2015 would be 10.28% instead of the 10.32% approved by the FERC in September 2016. The proposed methodology would also impact the second complaint filed in February 2015 and ATC’s base ROE going forward. We are uncertain when a final FERC order related to the proposed methodology will be issued.

06/30/2019 Form 10-Q 67 WEC Energy Group, Inc.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes related to market risk from the disclosures presented in our 2018 Annual Report on Form 10-K. In addition to the Form 10-K disclosures, see Management's Discussion and Analysis of Financial Condition and Results of Operations – Factors Affecting Results, Liquidity, and Capital Resources – Market Risks and Other Significant Risks in Item 2 of Part I of this report, as well as Note 13, Fair Value Measurements, Note 14, Derivative Instruments, and Note 15, Guarantees, in this report for information concerning our market risk exposures.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management, with the participation of our principal executive officer and principal financial officer, has evaluated the effectiveness of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based upon such evaluation, our principal executive officer and principal financial officer have concluded that, as of the end of such period, our disclosure controls and procedures are effective: (i) in recording, processing, summarizing, and reporting, on a timely basis, information required to be disclosed by us in the reports that we file or submit under the Exchange Act; and (ii) to ensure that information required to be disclosed in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting (as such term is defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) during the second quarter of 2019 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

06/30/2019 Form 10-Q 68 WEC Energy Group, Inc.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The following should be read in conjunction with Item 3. Legal Proceedings in Part I of our 2018 Annual Report on Form 10-K. See Note 21, Commitments and Contingencies, and Note 23, Regulatory Environment, in this report for more information on material legal proceedings and matters related to us and our subsidiaries.

In addition to those legal proceedings discussed in Note 21, Commitments and Contingencies, Note 23, Regulatory Environment, and below, we are currently, and from time to time, subject to claims and suits arising in the ordinary course of business. Although the results of these additional legal proceedings cannot be predicted with certainty, management believes, after consultation with legal counsel, that the ultimate resolution of these proceedings will not have a material effect on our financial statements.

Environmental Matters

Manlove Field Matter

In September 2017, the Illinois Department of Natural Resources, Office of Oil and Gas Resource Management, issued a VN to PGL related to a leak of natural gas from a well located at the PGL Manlove Gas Storage Field in December 2016. PGL quickly shut down and permanently plugged the well to contain the leak after it was discovered. The leak resulted in the migration of natural gas from the well to the Mahomet Aquifer located in central Illinois and impacted residential freshwater wells. PGL has been working with residents potentially impacted by the natural gas leak, and the Illinois state agencies to investigate and remediate the impacts of the natural gas leak to the Mahomet Aquifer. In October 2017, the Illinois AG filed a complaint against PGL alleging certain violations of the Illinois Environmental Protection Act and the Oil and Gas Act. PGL entered into an interim agreed order with the State of Illinois in October 2017 whereby PGL agreed, among other things, to continue actions it was already undertaking proactively.

In addition, in December 2017, the IEPA issued a VN to PGL alleging the same violations as the AG. Lastly, in January 2018, the IEPA issued a VN alleging certain violations of Illinois air emission rules arising from the construction and operation of flaring equipment at the leak site. Both of the IEPA VN matters have been referred to the AG for enforcement.

In the complaint, as is customary in these types of actions, the AG cited to the statutory penalties allowed by law. Ultimately, the pursuit of any civil penalties is at the AG’s discretion. In the event the AG wishes to consider such penalties, we believe that PGL's high level of cooperation and quick action to remedy the situation and to work with the potentially impacted homeowners would be taken into account. At this time, we believe that civil penalties, if any, will not have a material impact on our financial statements.

ITEM 1A. RISK FACTORS

There were no material changes from the risk factors presented in our 2018 Annual Report on Form 10-K. See Item 1A. Risk Factors in Part I of our Form 10-K for a discussion of certain risk factors applicable to us.

06/30/2019 Form 10-Q 69 WEC Energy Group, Inc.

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

The following table sets forth information regarding the purchases of our equity securities made by or on behalf of us or any affiliated purchaser (as defined in Exchange Act Rule 10b-18) during the three months ended June 30, 2019:

Issuer Purchases of Equity Securities

2019	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs
April 1 – April 30	—	$	—	—	$	—
May 1 – May 31	500	77.70		—	—
June 1 – June 30	—	—		—	—
Total *	500	$	77.70	—

* All shares were surrendered by employees to satisfy tax withholding obligations upon vesting of restricted stock.

ITEM 6. EXHIBITS

Number	Exhibit
31	Rule 13a-14(a) / 15d-14(a) Certifications
	31.1	Certification Pursuant to Rule 13a-14(a) or 15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
	31.2	Certification Pursuant to Rule 13a-14(a) or 15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32	Section 1350 Certifications
	32.1	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
	32.2	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	Interactive Data Files
	101.INS	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
	101.SCH	Inline XBRL Taxonomy Extension Schema
	101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase
	101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase
	101.LAB	Inline XBRL Taxonomy Extension Label Linkbase
	101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

06/30/2019 Form 10-Q 70 WEC Energy Group, Inc.

SIGNATURE

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.

		WEC ENERGY GROUP, INC.
		(Registrant)
		/s/ WILLIAM J. GUC
Date:	August 6, 2019	William J. Guc
		Vice President and Controller
		(Duly Authorized Officer and Chief Accounting Officer)

06/30/2019 Form 10-Q 71 WEC Energy Group, Inc.

EX-31.1

Exhibit 31.1

Certification Pursuant to

Rule 13a-14(a) or 15d-14(a),

as Adopted Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, J. Kevin Fletcher, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of WEC Energy Group, Inc.;

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

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

4. The registrant's other certifying officer(s) 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(s) 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:	August 6, 2019
	/s/ J. KEVIN FLETCHER
	J. Kevin Fletcher
	President and Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification Pursuant to

Rule 13a-14(a) or 15d-14(a),

as Adopted Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Scott J. Lauber, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of WEC Energy Group, Inc.;

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

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

4. The registrant's other certifying officer(s) 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(s) 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:	August 6, 2019
	/s/ SCOTT J. LAUBER
	Scott J. Lauber
	Senior Executive Vice President, Chief Financial Officer and Treasurer
	(Principal Financial Officer)

EX-32.1

Exhibit 32.1

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 WEC Energy Group, Inc. (the "Company") on Form 10-Q for the quarter ended June 30, 2019, as filed with the Securities and Exchange Commission on August 6, 2019 (the "Report"), I, J. Kevin Fletcher, President and Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

(1) The Report 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 Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ J. KEVIN FLETCHER

J. Kevin Fletcher

President and Chief Executive Officer

August 6, 2019

EX-32.2

Exhibit 32.2

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 WEC Energy Group, Inc. (the "Company") on Form 10-Q for the quarter ended June 30, 2019, as filed with the Securities and Exchange Commission on August 6, 2019 (the "Report"), I, Scott J. Lauber, Senior Executive Vice President, Chief Financial Officer and Treasurer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge, that:

(1) The Report 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 Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ SCOTT J. LAUBER

Scott J. Lauber

Senior Executive Vice President, Chief Financial Officer and Treasurer

August 6, 2019

XML

COVER PAGE	6 Months Ended
	Jun. 30, 2019 shares
Cover page.
Document type	10-Q
Document Quarterly Report	true
Document period end date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-09057
Entity registrant name	WEC ENERGY GROUP, INC.
Entity Tax Identification Number	39-1391525
Entity Incorporation, State or Country Code	WI
Entity Address, Address Line One	231 West Michigan Street
Entity Address, Address Line Two	P. O. Box 1331
Entity Address, City or Town	Milwaukee
Entity Address, State or Province	WI
Entity Address, Postal Zip Code	53201
City Area Code	414
Local Phone Number	221-2345
Title of 12(b) Security	Common Stock, $.01 Par Value
Trading Symbol	WEC
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity filer category	Large Accelerated Filer
Small company	false
Emerging growth company	false
Entity Shell Company	false
Entity common stock, shares outstanding	315,435,820
Entity central index key	0000783325
Current fiscal year end date	--12-31
Document fiscal year focus	2019
Document fiscal period focus	Q2
Amendment flag	false

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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Operating revenues	$ 1,590.2	$ 1,672.5	$ 3,967.6	$ 3,959.0
Operating expenses
Cost of sales	491.9	547.7	1,501.5	1,519.8
Other operation and maintenance	503.6	537.7	1,054.2	1,049.6
Depreciation and amortization	229.9	206.7	456.3	415.3
Property and revenue taxes	50.2	49.6	98.2	98.4
Total operating expenses	1,275.6	1,341.7	3,110.2	3,083.1
Operating income	314.6	330.8	857.4	875.9
Equity in earnings of transmission affiliates	36.9	28.7	73.0	61.5
Other income, net	23.6	31.4	54.5	38.9
Interest expense	124.1	108.5	248.5	215.2
Other expense	(63.6)	(48.4)	(121.0)	(114.8)
Income before income taxes	251.0	282.4	736.4	761.1
Income tax expense	15.2	51.1	80.2	139.4
Net income	235.8	231.3	656.2	621.7
Preferred stock dividends of subsidiary	0.3	0.3	0.6	0.6
Net loss attributed to noncontrolling interests	0.2	0.0	0.2	0.0
Net income attributed to common shareholders	$ 235.7	$ 231.0	$ 655.8	$ 621.1
Earnings per share
Basic (in dollars per share)	$ 0.75	$ 0.73	$ 2.08	$ 1.97
Diluted (in dollars per share)	$ 0.74	$ 0.73	$ 2.07	$ 1.96
Weighted average common shares outstanding
Basic (in shares)	315.4	315.5	315.4	315.5
Diluted (in shares)	316.7	316.9	316.7	316.9

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Other Comprehensive Income [Abstract]
Net income	$ 235.8	$ 231.3	$ 656.2	$ 621.7
Derivatives accounted for as cash flow hedges
Derivative losses, net of tax benefit of $(0.9), $0, $(1.3), and $0, respectively	(2.3)	0.0	(3.5)	0.0
Reclassification of net gains to net income, net of tax	(0.3)	(0.4)	(0.6)	(0.6)
Cash flow hedges, net	(2.6)	(0.4)	(4.1)	(0.6)
Defined benefit plans
Amortization of pension and OPEB costs (credits) included in net periodic benefit cost, net of tax	0.0	(1.7)	0.1	0.2
Other comprehensive loss, net of tax	(2.6)	(2.1)	(4.0)	(0.4)
Comprehensive income	233.2	229.2	652.2	621.3
Preferred stock dividends of subsidiary	0.3	0.3	0.6	0.6
Net loss attributed to noncontrolling interests	0.2	0.0	0.2	0.0
Comprehensive income attributed to common shareholders	$ 233.1	$ 228.9	$ 651.8	$ 620.7

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Derivative losses, net of tax benefit	$ (0.9)	$ 0.0	$ (1.3)	$ 0.0

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 37.9	$ 84.5
Accounts receivable and unbilled revenues, net of reserves of $143.3 and $149.2, respectively	1,004.3	1,280.9
Materials, supplies, and inventories	461.4	548.2
Prepayments	254.8	256.8
Other	80.3	77.2
Current assets	1,838.7	2,247.6
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $8,705.0 and $8,636.6, respectively	22,535.8	22,000.9
Regulatory assets	4,007.0	3,805.1
Equity investment in transmission affiliates	1,696.5	1,665.3
Goodwill	3,052.8	3,052.8
Other	803.5	704.1
Long-term assets	32,095.6	31,228.2
Total assets	33,934.3	33,475.8
Current liabilities
Short-term debt	1,262.7	1,440.1
Current portion of long-term debt	766.5	365.0
Accounts payable	715.6	876.4
Accrued payroll and benefits	159.3	185.4
Other	457.9	464.8
Current liabilities	3,362.0	3,331.7
Long-term liabilities
Long-term debt	9,921.0	9,994.0
Deferred income taxes	3,598.1	3,388.1
Deferred revenue, net	508.7	520.4
Regulatory liabilities	4,243.6	4,251.6
Environmental remediation liabilities	631.8	616.4
Pension and OPEB obligations	414.0	422.8
Other	1,106.8	1,108.1
Long-term liabilities	20,424.0	20,301.4
Commitments and contingencies (Note 21)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,435,820 and 315,523,192 shares outstanding, respectively	3.2	3.2
Additional paid in capital	4,197.9	4,250.1
Retained earnings	5,821.7	5,538.2
Accumulated other comprehensive loss	(6.6)	(2.6)
Common shareholders' equity	10,016.2	9,788.9
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	101.7	23.4
Total liabilities and equity	$ 33,934.3	$ 33,475.8

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable and accrued unbilled revenues, reserves	$ 143.3	$ 149.2
Property, plant, and equipment, accumulated depreciation	$ 8,705.0	$ 8,636.6
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	325,000,000	325,000,000
Common stock, shares outstanding	315,435,820	315,523,192

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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Total Common Shareholders' Equity	Common stock	Additional paid in capital	Retained earnings	Accumulated other comprehensive income	Preferred stock of subsidiary	Noncontrolling interests
Balance at Dec. 31, 2017	$ 9,491.8	$ 9,461.4	$ 3.2	$ 4,278.5	$ 5,176.8	$ 2.9	$ 30.4	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributed to common shareholders	390.1	390.1	0.0	0.0	390.1	0.0	0.0	0.0
Other comprehensive income (loss)	1.7	1.7	0.0	0.0	0.0	1.7	0.0	0.0
Common stock dividends	(174.2)	(174.2)	0.0	0.0	(174.2)	0.0	0.0	0.0
Exercise of stock options	2.1	2.1	0.0	2.1	0.0	0.0	0.0	0.0
Purchase of common stock	(15.8)	(15.8)	0.0	(15.8)	0.0	0.0	0.0	0.0
Stock-based compensation and other	2.5	2.5	0.0	2.5	0.0	0.0	0.0	0.0
Balance at Mar. 31, 2018	9,698.2	9,667.8	3.2	4,267.3	5,392.7	4.6	30.4	0.0
Balance at Dec. 31, 2017	9,491.8	9,461.4	3.2	4,278.5	5,176.8	2.9	30.4	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributed to common shareholders	621.1
Other comprehensive income (loss)	(0.4)
Balance at Jun. 30, 2018	9,756.2	9,725.8	3.2	4,271.0	5,449.1	2.5	30.4	0.0
Balance at Mar. 31, 2018	9,698.2	9,667.8	3.2	4,267.3	5,392.7	4.6	30.4	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributed to common shareholders	231.0	231.0	0.0	0.0	231.0	0.0	0.0	0.0
Other comprehensive income (loss)	(2.1)	(2.1)	0.0	0.0	0.0	(2.1)	0.0	0.0
Common stock dividends	(174.5)	(174.5)	0.0	0.0	(174.5)	0.0	0.0	0.0
Exercise of stock options	3.0	3.0	0.0	3.0	0.0	0.0	0.0	0.0
Purchase of common stock	(4.0)	(4.0)	0.0	(4.0)	0.0	0.0	0.0	0.0
Stock-based compensation and other	4.6	4.6	0.0	4.7	(0.1)	0.0	0.0	0.0
Balance at Jun. 30, 2018	9,756.2	9,725.8	3.2	4,271.0	5,449.1	2.5	30.4	0.0
Balance at Dec. 31, 2018	9,842.7	9,788.9	3.2	4,250.1	5,538.2	(2.6)	30.4	23.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributed to common shareholders	420.1	420.1	0.0	0.0	420.1	0.0	0.0	0.0
Other comprehensive income (loss)	(1.4)	(1.4)	0.0	0.0	0.0	(1.4)	0.0	0.0
Common stock dividends	(186.2)	(186.2)	0.0	0.0	(186.2)	0.0	0.0	0.0
Exercise of stock options	32.6	32.6	0.0	32.6	0.0	0.0	0.0	0.0
Purchase of common stock	(70.7)	(70.7)	0.0	(70.7)	0.0	0.0	0.0	0.0
Acquisition of a noncontrolling interest	69.0	0.0	0.0	0.0	0.0	0.0	0.0	69.0
Capital contributions from noncontrolling interest	4.8	0.0	0.0	0.0	0.0	0.0	0.0	4.8
Stock-based compensation and other	1.2	1.2	0.0	1.2	0.0	0.0	0.0	0.0
Balance at Mar. 31, 2019	10,112.1	9,984.5	3.2	4,213.2	5,772.1	(4.0)	30.4	97.2
Balance at Dec. 31, 2018	9,842.7	9,788.9	3.2	4,250.1	5,538.2	(2.6)	30.4	23.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributed to common shareholders	655.8
Other comprehensive income (loss)	(4.0)
Balance at Jun. 30, 2019	10,148.3	10,016.2	3.2	4,197.9	5,821.7	(6.6)	30.4	101.7
Balance at Mar. 31, 2019	10,112.1	9,984.5	3.2	4,213.2	5,772.1	(4.0)	30.4	97.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributed to common shareholders	235.7	235.7	0.0	0.0	235.7	0.0	0.0	0.0
Other comprehensive income (loss)	(2.6)	(2.6)	0.0	0.0	0.0	(2.6)	0.0	0.0
Common stock dividends	(186.1)	(186.1)	0.0	0.0	(186.1)	0.0	0.0	0.0
Exercise of stock options	17.5	17.5	0.0	17.5	0.0	0.0	0.0	0.0
Purchase of common stock	(35.6)	(35.6)	0.0	(35.6)	0.0	0.0	0.0	0.0
Capital contributions from noncontrolling interest	5.4	0.0	0.0	0.0	0.0	0.0	0.0	5.4
Distributions to noncontrolling interests	(0.9)	0.0	0.0	0.0	0.0	0.0	0.0	(0.9)
Stock-based compensation and other	2.8	2.8	0.0	2.8	0.0	0.0	0.0	0.0
Balance at Jun. 30, 2019	$ 10,148.3	$ 10,016.2	$ 3.2	$ 4,197.9	$ 5,821.7	$ (6.6)	$ 30.4	$ 101.7

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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Quarterly cash dividend declared (in dollars per share)	$ 0.59	$ 0.5525

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net income	$ 656.2	$ 621.7
Reconciliation to cash provided by operating activities
Depreciation and amortization	456.3	415.3
Deferred income taxes and investment tax credits, net	96.1	31.7
Contributions and payments related to pension and OPEB plans	(8.3)	(9.7)
Equity income in transmission affiliates, net of distributions	(9.4)	4.9
Change in –
Accounts receivable and unbilled revenues	267.9	235.5
Materials, supplies, and inventories	87.0	72.6
Other current assets	20.0	78.8
Accounts payable	(222.7)	(85.0)
Other current liabilities	(55.1)	0.1
Other, net	3.2	147.5
Net cash provided by operating activities	1,291.2	1,513.4
Investing Activities
Capital expenditures	(855.2)	(915.5)
Acquisition of Upstream, net of cash and restricted cash acquired of $9.2	(268.2)	0.0
Acquisition of Forward Wind Energy Center	0.0	(77.1)
Capital contributions to transmission affiliates	(21.9)	(32.4)
Proceeds from the sale of assets and businesses	30.0	7.9
Proceeds from the sale of investments held in rabbi trust	0.1	16.5
Reimbursement for ATC's construction costs	32.4	0.0
Other, net	16.4	3.8
Net cash used in investing activities	(1,066.4)	(996.8)
Financing Activities
Exercise of stock options	50.1	5.1
Purchase of common stock	(106.3)	(19.8)
Dividends paid on common stock	(372.3)	(348.7)
Issuance of long-term debt	350.0	600.0
Retirement of long-term debt	(17.3)	(681.4)
Change in short-term debt	(177.4)	(74.6)
Other, net	(7.0)	(3.8)
Net cash used in financing activities	(280.2)	(523.2)
Net change in cash, cash equivalents, and restricted cash	(55.4)	(6.6)
Cash, cash equivalents, and restricted cash at beginning of period	146.1	58.6
Cash, cash equivalents, and restricted cash at end of period	$ 90.7	$ 52.0

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Statement of Cash Flows [Abstract]
Cash and restricted cash acquired	$ 9.2	$ 0.0

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GENERAL INFORMATION

6 Months Ended

Jun. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

GENERAL INFORMATION

GENERAL INFORMATION

WEC Energy Group serves approximately 1.6 million electric customers and 2.9 million natural gas customers, and owns approximately 60% of ATC.

As used in these notes, the term "financial statements" refers to the condensed consolidated financial statements. This includes the income statements, statements of comprehensive income, balance sheets, statements of cash flows, and statements of equity, unless otherwise noted. In this report, when we refer to "the Company," "us," "we," "our," or "ours," we are referring to WEC Energy Group and all of its subsidiaries.

On our financial statements, we consolidate our majority-owned subsidiaries and reflect noncontrolling interests for the portion of entities that we do not own as a component of consolidated equity separate from the equity attributable to our shareholders. The noncontrolling interests that we reported as equity on our balance sheet as of June 30, 2019 related to the minority interests at Bishop Hill III, Coyote Ridge, and Upstream held by third parties. We completed the acquisition of an 80% membership interest in Upstream during January 2019. See Note 2, Acquisitions, for more information.

We use the equity method to account for investments in companies we do not control but over which we exercise significant influence regarding their operating and financial policies. As a result of our limited voting rights, we account for ATC and ATC Holdco as equity method investments. See Note 18, Investment in Transmission Affiliates, for more information.

We have prepared the unaudited interim financial statements presented in this Form 10-Q pursuant to the rules and regulations of the SEC and GAAP. Accordingly, these financial statements do not include all of the information and footnotes required by GAAP for annual financial statements. These financial statements should be read in conjunction with the consolidated financial statements and footnotes in our Annual Report on Form 10-K for the year ended December 31, 2018. Financial results for an interim period may not give a true indication of results for the year. In particular, the results of operations for the three and six months ended June 30, 2019, are not necessarily indicative of expected results for 2019 due to seasonal variations and other factors.

In management's opinion, we have included all adjustments, normal and recurring in nature, necessary for a fair presentation of our financial results.

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ACQUISITIONS

6 Months Ended

Jun. 30, 2019

Business Combinations [Abstract]

ACQUISITIONS

ACQUISITIONS

All the acquisitions discussed below were accounted for as asset acquisitions.

Acquisition of a Wind Generation Facility in Nebraska

In January 2019, we completed the acquisition of an 80% membership interest in Upstream, a commercially operational 202.5 MW wind generating facility, for $268.2 million, which included transactions costs and is net of cash and restricted cash acquired of $9.2 million. Upstream is located in Antelope County, Nebraska and supplies energy to the Southwest Power Pool. Upstream's revenue will be substantially fixed over a 10-year period through an agreement with an unaffiliated third party. Under the Tax Legislation, our investment in Upstream qualifies for production tax credits and 100% bonus depreciation. Upstream is included in the non-utility energy infrastructure segment.

Acquisition of a Wind Generation Facility in South Dakota

In December 2018, we acquired an 80% ownership interest in Coyote Ridge, a 97.5 MW wind generating facility under construction in Brookings County, South Dakota, for $61.6 million, which included transaction costs. This wind generating facility is expected to be in service by the end of 2019. Upon completion, we expect our total investment in Coyote Ridge to be $145 million. The project has a 12-year offtake agreement with an unaffiliated third party for all of the energy produced by the facility. Under the Tax Legislation, our investment in Coyote Ridge is expected to qualify for production tax credits and 100% bonus depreciation. We are entitled to 99% of the tax benefits related to this facility for the first 11 years of commercial operation, after which we will be entitled to tax benefits equal to our ownership interest. Coyote Ridge is included in the non-utility energy infrastructure segment.

Acquisition of a Wind Energy Generation Facility in Illinois

In August 2018, we completed the acquisition of an 80% membership interest in a commercially operational 132 MW wind generating facility located in Henry County, Illinois, known as Bishop Hill III, for $144.7 million, which included transaction costs and was net of restricted cash acquired of $4.5 million. In December 2018, we completed the acquisition of an additional 10% membership interest in Bishop Hill III, for $18.2 million. Bishop Hill III has a 22-year offtake agreement with an unaffiliated third party for all of the energy produced by the facility. Under the Tax Legislation, our investment in Bishop Hill III qualifies for production tax credits and 100% bonus depreciation. Bishop Hill III is included in the non-utility energy infrastructure segment.

Acquisition of a Wind Energy Generation Facility in Wisconsin

In April 2018, WPS, along with two unaffiliated utilities, completed the purchase of Forward Wind Energy Center, which consists of 86 wind turbines located in Wisconsin with a total capacity of 138 MW. The aggregate purchase price was $172.9 million of which WPS’s proportionate share was 44.6%, or $77.1 million. In addition, we incurred transaction costs that are recorded to a regulatory asset. Since 2008 and up until the acquisition, WPS purchased 44.6% of the facility’s energy output under a power purchase agreement.

Under a joint ownership agreement with the two other utilities, WPS is entitled to its share of generating capability and output of the facility equal to its ownership interest. WPS is also paying its ownership share of additional capital expenditures and operating expenses. Forward Wind Energy Center is included in the Wisconsin segment.

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DISPOSITION

6 Months Ended

Jun. 30, 2019

Discontinued Operations and Disposal Groups [Abstract]

DISPOSITION

DISPOSITION

Corporate and Other Segment – Sale of Certain WPS Power Development, LLC Solar Power Generation Facilities

In June 2019, we sold three solar power generation facilities owned by PDL for $20.0 million. These solar facilities were located in Massachusetts. During the second quarter of 2019, we recorded an after-tax gain on the sale of $4.9 million primarily related to the recognition of deferred investment tax credits. This was included in income tax expense on our income statements. The assets included in the sale were not material and, therefore, were not presented as held for sale. The results of operations of these facilities remained in continuing operations through the sale date as the sale did not represent a shift in our corporate strategy and did not have a major effect on our operations and financial results.

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OPERATING REVENUES

6 Months Ended

Jun. 30, 2019

Revenue from Contract with Customer [Abstract]

OPERATING REVENUES

OPERATING REVENUES

For more information about our significant accounting policies related to operating revenues, see Note 1(d), Operating Revenues, in our 2018 Annual Report on Form 10-K.

Disaggregation of Operating Revenues

The following tables present our operating revenues disaggregated by revenue source. We do not have any revenues associated with our electric transmission segment, which includes investments accounted for using the equity method. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. For our segments, revenues are further disaggregated by electric and natural gas operations and then by customer class. Each customer class within our electric and natural gas operations have different expectations of service, energy and demand requirements, and are impacted by regulatory activities within their jurisdictions.

(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended June 30, 2019
Electric	$	1,021.9	$	—	$	—	$	1,021.9	$	—	$	—	$	—		$	1,021.9
Natural gas	227.3		232.8		64.0		524.1		9.8		—		(9.1		)	524.8
Total regulated revenues	1,249.2		232.8		64.0		1,546.0		9.8		—		(9.1		)	1,546.7
Other non-utility revenues	—		—		4.2		4.2		15.3		0.8		(3.1		)	17.2
Total revenues from contracts with customers	1,249.2		232.8		68.2		1,550.2		25.1		0.8		(12.2		)	1,563.9
Other operating revenues	4.1		10.1		0.6		14.8		98.2		0.1		(86.8		)	26.3
Total operating revenues	$	1,253.3	$	242.9	$	68.8	$	1,565.0	$	123.3	$	0.9	$	(99.0	)	$	1,590.2

(in millions)	Wisconsin		Illinois			Other States			Total Utility Operations			Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended June 30, 2018
Electric	$	1,084.2	$	—		$	—		$	1,084.2		$	—	$	—	$	—		$	1,084.2
Natural gas	236.4		273.8			68.9			579.1			10.0		—		(12.7		)	576.4
Total regulated revenues	1,320.6		273.8			68.9			1,663.3			10.0		—		(12.7		)	1,660.6
Other non-utility revenues	—		0.1			3.9			4.0			9.3		2.8		(3.1		)	13.0
Total revenues from contracts with customers	1,320.6		273.9			72.8			1,667.3			19.3		2.8		(15.8		)	1,673.6
Other operating revenues	4.9		(5.9		)	(0.4		)	(1.4		)	97.7		0.3		(97.7		)	(1.1		)
Total operating revenues	$	1,325.5	$	268.0		$	72.4		$	1,665.9		$	117.0	$	3.1	$	(113.5	)	$	1,672.5

(in millions)	Wisconsin		Illinois		Other States			Total Utility Operations		Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended June 30, 2019
Electric	$	2,083.7	$	—	$	—		$	2,083.7	$	—	$	—	$	—		$	2,083.7
Natural gas	792.2		777.4		249.2			1,818.8		26.2		—		(23.8		)	1,821.2
Total regulated revenues	2,875.9		777.4		249.2			3,902.5		26.2		—		(23.8		)	3,904.9
Other non-utility revenues	—		0.1		8.3			8.4		28.6		2.3		(3.8		)	35.5
Total revenues from contracts with customers	2,875.9		777.5		257.5			3,910.9		54.8		2.3		(27.6		)	3,940.4
Other operating revenues	10.8		1.9		(3.5		)	9.2		196.3		0.3		(178.6		)	27.2
Total operating revenues	$	2,886.7	$	779.4	$	254.0		$	3,920.1	$	251.1	$	2.6	$	(206.2	)	$	3,967.6

(in millions)	Wisconsin		Illinois			Other States			Total Utility Operations			Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended June 30, 2018
Electric	$	2,151.9	$	—		$	—		$	2,151.9		$	—	$	—	$	—		$	2,151.9
Natural gas	754.4		781.4			241.6			1,777.4			24.9		—		(15.2		)	1,787.1
Total regulated revenues	2,906.3		781.4			241.6			3,929.3			24.9		—		(15.2		)	3,939.0
Other non-utility revenues	—		0.1			7.8			7.9			16.4		4.1		(3.8		)	24.6
Total revenues from contracts with customers	2,906.3		781.5			249.4			3,937.2			41.3		4.1		(19.0		)	3,963.6
Other operating revenues	8.3		(6.2		)	(7.1		)	(5.0		)	193.8		0.4		(193.8		)	(4.6		)
Total operating revenues	$	2,914.6	$	775.3		$	242.3		$	3,932.2		$	235.1	$	4.5	$	(212.8	)	$	3,959.0

Revenues from Contracts with Customers

Electric Utility Operating Revenues

The following table disaggregates electric utility operating revenues into customer class:

	Electric Utility Operating Revenues
	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Residential	$	356.7	$	393.7	$	763.4	$	778.0
Small commercial and industrial	331.3		353.3		665.2		684.0
Large commercial and industrial	217.8		241.6		430.1		445.5
Other	7.3		7.2		15.1		14.9
Total retail revenues	913.1		995.8		1,873.8		1,922.4
Wholesale	44.6		58.4		92.3		113.3
Resale	49.4		25.1		90.2		98.9
Steam	4.3		4.5		14.4		14.2
Other utility revenues	10.5		0.4		13.0		3.1
Total electric utility operating revenues	$	1,021.9	$	1,084.2	$	2,083.7	$	2,151.9

Natural Gas Utility Operating Revenues

The following tables disaggregate natural gas utility operating revenues into customer class:

(in millions)	Wisconsin		Illinois			Other States			Total Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2019
Residential	$	126.2	$	154.1		$	39.3		$	319.6
Commercial and industrial	55.8		45.1			20.5			121.4
Total retail revenues	182.0		199.2			59.8			441.0
Transport	16.2		46.8			6.3			69.3
Other utility revenues *	29.1		(13.2		)	(2.1		)	13.8
Total natural gas utility operating revenues	$	227.3	$	232.8		$	64.0		$	524.1

(in millions)	Wisconsin		Illinois		Other States		Total Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2018
Residential	$	128.1	$	163.7	$	37.9	$	329.7
Commercial and industrial	63.5		47.3		18.7		129.5
Total retail revenues	191.6		211.0		56.6		459.2
Transport	16.4		54.6		6.8		77.8
Other utility revenues *	28.4		8.2		5.5		42.1
Total natural gas utility operating revenues	$	236.4	$	273.8	$	68.9	$	579.1

(in millions)	Wisconsin			Illinois			Other States			Total Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2019
Residential	$	510.1		$	508.1		$	164.5		$	1,182.7
Commercial and industrial	255.5			161.3			92.5			509.3
Total retail revenues	765.6			669.4			257.0			1,692.0
Transport	38.1			134.0			17.4			189.5
Other utility revenues *	(11.5		)	(26.0		)	(25.2		)	(62.7		)
Total natural gas utility operating revenues	$	792.2		$	777.4		$	249.2		$	1,818.8

(in millions)	Wisconsin			Illinois			Other States			Total Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2018
Residential	$	484.8		$	496.3		$	161.1		$	1,142.2
Commercial and industrial	251.4			156.7			83.4			491.5
Total retail revenues	736.2			653.0			244.5			1,633.7
Transport	37.4			132.3			16.7			186.4
Other utility revenues *	(19.2		)	(3.9		)	(19.6		)	(42.7		)
Total natural gas utility operating revenues	$	754.4		$	781.4		$	241.6		$	1,777.4

* Includes amounts collected from (refunded to) customers for purchased gas adjustment costs.

Other Non-Utility Operating Revenues

Other non-utility operating revenues consist primarily of the following:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
We Power revenues	$	6.3	$	6.2	$	12.7	$	12.6
Appliance service revenues	4.2		3.9		8.3		7.8
Distributed renewable solar project revenues	0.8		2.8		2.3		4.1
Wind generation revenues *	5.9		—		12.1		—
Other	—		0.1		0.1		0.1
Total other non-utility operating revenues	$	17.2	$	13.0	$	35.5	$	24.6

* In 2019, we continued to invest in wind generation facilities and recognize revenues from these wind generation facilities as energy is produced and delivered to the customer within the production month.

As part of the construction of the We Power electric generating units, we capitalized interest during construction, which is included in property, plant, and equipment. As allowed by the PSCW, we collected carrying costs from WE's utility customers during construction. The equity portion of these carrying costs was recorded as deferred revenue, net on our balance sheets and we continually amortize this contract liability to revenues over the life of the related lease term that We Power has with WE.

During the three and six months ended June 30, 2019, we recorded $6.3 million and $12.7 million of revenue, respectively, related to amortization of these deferred carrying costs. During the three and six months ended June 30, 2018, we recorded $6.2 million and $12.6 million of revenue, respectively, related to amortization of these deferred carrying costs.

Other Operating Revenues

Other operating revenues consist primarily of the following:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2019		2018			2019			2018
Alternative revenues *	$	1.1	$	(14.2	)	$	(18.6	)	$	(30.3	)
Late payment charges	12.0		11.1			25.2			22.5
Rental revenues	13.2		2.0			20.6			3.2
Total other operating revenues	$	26.3	$	(1.1	)	$	27.2		$	(4.6	)

*

Negative amounts can result from alternative revenues being reversed to revenues from contracts with customers as the customer is billed for these alternative revenues. Negative amounts can also result from revenues to be refunded to customers subject to decoupling mechanisms and wholesale true-ups.

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REGULATORY ASSETS AND LIABILITIES

6 Months Ended

Jun. 30, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

REGULATORY ASSETS AND LIABILITIES

REGULATORY ASSETS AND LIABILITIES

The following regulatory assets and liabilities were reflected on our balance sheets at June 30, 2019 and December 31, 2018. For more information on our regulatory assets and liabilities, see Note 5, Regulatory Assets and Liabilities, in our 2018 Annual Report on Form 10-K.

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	1,153.3	$	1,193.5
Plant retirements *	1,031.7		832.3
Environmental remediation costs	707.6		687.1
Income tax related items	424.6		369.1
SSR	319.0		316.7
Asset retirement obligations	212.2		185.4
Uncollectible expense	43.6		38.7
We Power generation	38.6		43.0
Electric transmission costs	25.6		58.1
Energy efficiency programs	8.9		14.0
Other, net	70.2		117.9
Total regulatory assets	$	4,035.3	$	3,855.8
Balance sheet presentation
Other current assets	$	28.3	$	50.7
Regulatory assets	4,007.0		3,805.1
Total regulatory assets	$	4,035.3	$	3,855.8

* On March 31, 2019, the PIPP generating units were retired by WE. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP units.

(in millions)	June 30, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	2,389.6	$	2,406.6
Removal costs	1,304.7		1,329.6
Pension and OPEB costs	231.2		238.3
Mines deferral	130.5		120.8
Energy costs refundable through rate adjustments	90.1		39.6
Decoupling	48.7		30.5
Energy efficiency programs	42.0		31.7
Uncollectible expense	31.9		30.5
Earnings sharing mechanisms	30.0		30.0
Derivatives	17.5		16.4
Other, net	14.2		14.4
Total regulatory liabilities	$	4,330.4	$	4,288.4
Balance sheet presentation
Other current liabilities	$	86.8	$	36.8
Regulatory liabilities	4,243.6		4,251.6
Total regulatory liabilities	$	4,330.4	$	4,288.4

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PROPERTY, PLANT, AND EQUIPMENT

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT

PROPERTY, PLANT, AND EQUIPMENT

Presque Isle Power Plant

Pursuant to MISO's April 2018 approval of the retirement of the PIPP, these units were retired on March 31, 2019. The carrying value of the PIPP units was $167.2 million at June 30, 2019. This amount included the net book value of $178.5 million, which was classified as a regulatory asset on our balance sheets as a result of the retirement of the plant. In addition, an $11.3 million cost of removal reserve related to the PIPP units remained classified as a regulatory liability at June 30, 2019. After the retirement of the PIPP, a portion of the regulatory asset and related cost of removal reserve was transferred to UMERC for recovery from their retail customers. WE has FERC approval to continue to collect the carrying value of the PIPP units using the approved composite depreciation rates, in addition to a return on the remaining carrying value. However, this approval is subject to refund pending the outcome of settlement procedures. WE and UMERC will amortize the regulatory assets on a straight-line basis using the composite depreciation rates approved by the PSCW before the units were retired.

Severance Liability for Plant Retirements

We have evaluated future plans for our older and less efficient fossil fuel generating units and have retired several plants within the Wisconsin segment. In addition, a severance liability was recorded in other current liabilities on our balance sheets related to these plant retirements.

(in millions)
Severance liability at December 31, 2018	$	15.7
Severance payments	(6.7		)
Other	(3.1		)
Total severance liability at June 30, 2019	$	5.9

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COMMON EQUITY

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

COMMON EQUITY

COMMON EQUITY

Stock-Based Compensation

During the first quarter of 2019, the Compensation Committee of our Board of Directors awarded the following stock-based compensation awards to our directors, officers, and certain other key employees:

Award Type	Number of Awards
Stock options (1)	476,418
Restricted shares (2)	73,571
Performance units	148,036

⁽¹⁾  Stock options awarded had a weighted-average exercise price of $68.18 and a weighted-average grant date fair value of $8.60 per option.

⁽²⁾  Restricted shares awarded had a weighted-average grant date fair value of $68.18 per share.

Restrictions

Our ability as a holding company to pay common stock dividends primarily depends on the availability of funds received from our utility subsidiaries, We Power, and ATC Holding. Various financing arrangements and regulatory requirements impose certain restrictions on the ability of our subsidiaries to transfer funds to us in the form of cash dividends, loans, or advances. All of our utility subsidiaries, with the exception of UMERC and MGU, are prohibited from loaning funds to us, either directly or indirectly. See Note 10, Common Equity, in our 2018 Annual Report on Form 10-K for additional information on these and other restrictions.

We do not believe that these restrictions will materially affect our operations or limit any dividend payments in the foreseeable future.

Common Stock Dividends

On July 18, 2019, our Board of Directors declared a quarterly cash dividend of $0.59 per share, payable on September 1, 2019, to shareholders of record on August 14, 2019.

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SHORT-TERM DEBT AND LINES OF CREDIT

6 Months Ended

Jun. 30, 2019

Short-term Debt [Abstract]

SHORT-TERM DEBT AND LINES OF CREDIT

SHORT-TERM DEBT AND LINES OF CREDIT

The following table shows our short-term borrowings and their corresponding weighted-average interest rates:

(in millions, except percentages)	June 30, 2019			December 31, 2018
Commercial paper
Amount outstanding	$	1,262.7		$	1,440.1
Weighted-average interest rate on amounts outstanding	2.58		%	2.92		%

Our average amount of commercial paper borrowings based on daily outstanding balances during the six months ended June 30, 2019 was $1,267.3 million with a weighted-average interest rate during the period of 2.76%.

The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including available capacity under these facilities:

(in millions)	Maturity	June 30, 2019
WEC Energy Group	October 2022	$	1,200.0
WE	October 2022	500.0
WPS	October 2022	400.0
WG	October 2022	350.0
PGL	October 2022	350.0
Total short-term credit capacity		$	2,800.0
Less:
Letters of credit issued inside credit facilities		$	2.5
Commercial paper outstanding		1,262.7
Available capacity under existing agreements		$	1,534.8

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LONG-TERM DEBT

6 Months Ended

Jun. 30, 2019

Long-term Debt, Unclassified [Abstract]

Long-Term Debt

LONG-TERM DEBT

WEC Energy Group, Inc.

In March 2019, we issued $350.0 million of 3.10% Senior Notes due March 8, 2022. We used the net proceeds to repay short-term debt, and for working capital and other general corporate purposes.

ATC Holding LLC

In July 2019, ATC Holding secured commitments for $235.0 million of 3.75% Senior Notes due September 16, 2029. ATC Holding expects to issue the Senior Notes in September 2019. The net proceeds are expected to be used to make a special distribution to WEC Energy Group in order to balance ATC Holding’s capital structure.

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LEASES

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

LEASES

LEASES

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which revised the previous guidance (Topic 840) regarding accounting for leases. Revisions include requiring a lessee to recognize a lease asset and a lease liability on its balance sheet for each lease, including operating leases with an initial term greater than 12 months. In addition, required quantitative and qualitative disclosures related to lease agreements were expanded.

As required, we adopted Topic 842 effective January 1, 2019. We utilized the following practical expedients, which were available under ASU 2016-02, in our adoption of the new lease guidance.

• We did not reassess whether any expired or existing contracts were leases or contained leases.

• We did not reassess the lease classification for any expired or existing leases (that is, all leases that were classified as operating leases in accordance with Topic 840 continue to be classified as operating leases, and all leases that were classified as capital leases in accordance with Topic 840 are classified as finance leases).

• We did not reassess the accounting for initial direct costs for any existing leases.

We did not elect the practical expedient allowing entities to account for the nonlease components in lease contracts as part of the single lease component to which they were related. Instead, in accordance with Accounting Standards Codification 842-10-15-31, our policy is to account for each lease component separately from the nonlease components of the contract.

We did not elect the practical expedient to use hindsight in determining the lease term and in assessing impairment of our right of use assets. No impairment losses were included in the measurement of our right of use assets upon our adoption of Topic 842.

In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842, which is an amendment to ASU 2016-02. Land easements (also commonly referred to as rights of way) represent the right to use, access or cross another entity's land for a specified purpose. This new guidance permits an entity to elect a transitional practical expedient, to be applied consistently, to not evaluate under Topic 842 land easements that were already in existence or had expired at the time of the entity's adoption of Topic 842. Once Topic 842 is adopted, an entity is required to apply Topic 842 prospectively to

all new (or modified) land easements to determine whether the arrangement should be accounted for as a lease. We elected this practical expedient, resulting in none of our land easements being treated as leases upon our adoption of Topic 842.

In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements, which amends ASU 2016-02 and allows entities the option to initially apply Topic 842 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption, if required. We used the optional transition method to apply the new guidance as of January 1, 2019, rather than as of the earliest period presented. We did not require a cumulative-effect adjustment upon adoption of Topic 842.

Right of use assets and related lease liabilities related to our operating leases that were recorded upon adoption of Topic 842 were $49.0 million and $48.8 million, respectively. Regarding our finance lease, while the adoption of Topic 842 changed the classification of expense related to this lease on a prospective basis, it had no impact on the total amount of lease expense recorded, and did not impact the lease asset and related liability amounts recorded on our balance sheets.

Obligations Under Operating Leases

We have recorded right of use assets and lease liabilities associated with the following operating leases.

• Leases of office space, primarily related to several floors we are leasing in the Aon Center office building in Chicago, Illinois, through April 2029.

• Land we are leasing related to our Rothschild biomass plant through June 2051, and also a land lease related to a non-utility solar facility through December 2034.

• Rail cars we are leasing to transport coal to various generating facilities through February 2021.

The operating leases generally require us to pay property taxes, insurance premiums, and operating and maintenance costs associated with the leased property. Many of our leases contain options to renew past the initial term, as set forth in the lease agreement.

Obligations Under Finance Lease

In 1997, we entered into a 25-year power purchase contract with an unaffiliated independent power producer. The contract, for 236 MWs of firm capacity from a natural gas-fired cogeneration facility, includes zero minimum energy requirements. When the contract expires in 2022, we may, at our option and with proper notice, renew for another ten years, purchase the generating facility at fair market value, or allow the contract to expire. We originally recorded this leased facility and corresponding obligation on our balance sheets at the estimated fair value of the plant's electric generating facilities. Minimum lease payments are a function of the 236 MWs of firm capacity we receive from the plant and the fixed monthly capacity rate published in the lease.

Prior to our adoption of Topic 842 on January 1, 2019, we accounted for this finance lease under Topic 980-840, Regulated Operations – Leases, as follows:

• We recorded our minimum lease payments as purchased power expense on our income statement.

• We recorded the difference between the minimum lease payments and the sum of imputed interest and amortization costs calculated under finance lease accounting rules as a deferred regulatory asset on our balance sheets.

In conjunction with our adoption of Topic 842, while the timing of expense recognition related to this finance lease did not change, classification of the lease expense changed as follows:

• Effective January 1, 2019, the minimum lease payments under the power purchase contract were no longer classified within purchased power expense, but were instead recorded as a component of depreciation and amortization and interest expense in accordance with Topic 980-842, Regulated Operations – Leases.

• In order to ensure the timing of lease expense did not change for this finance lease upon adoption of Topic 842, and still resembled the expense recognition pattern of an operating lease, in accordance with Topic 980-842 the amortization of the right of use assets was modified from what would typically be recorded for a finance lease under Topic 842.

• We continue to record the difference between the minimum lease payments and the sum of imputed interest and unadjusted amortization costs calculated under the finance lease accounting rules as a deferred regulatory asset on our balance sheets.

Due to the timing and the amounts of the minimum lease payments, the regulatory asset increased to $78.5 million in 2009, at which time the regulatory asset began to be reduced to zero over the remaining life of the contract. The total obligation under the finance lease was $21.0 million at June 30, 2019, and will decrease to zero over the remaining life of the contract.

Amounts Recognized in the Financial Statements

The components of lease expense and supplemental cash flow information related to our leases for the three and six months ended June 30 are as follows:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019			2018
Finance/capital lease expense (1)	$	2.1	$	1.9	$	4.1		$	3.8
Operating lease expense (2)	1.4		1.4		2.8			2.8
Short-term lease expense (2)	0.1		0.6		0.1			0.7
Total lease expense	$	3.6	$	3.9	$	7.0		$	7.3
Other information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for finance/capital lease (3)					$	1.8		$	3.8
Operating cash flows for operating leases					$	3.2		$	3.3
Financing cash flows for finance lease (3)					$	2.3		$	—
Non-cash activity – right of use assets obtained in exchange for operating lease liabilities					$	49.0
Remaining lease term – finance lease					2.9 years
Weighted-average remaining lease term – operating leases					13.1 years
Discount rate – finance lease (4)					15.8		%
Weighted average discount rate – operating leases (4)					4.4		%

⁽¹⁾  For the three and six months ended June 30, 2019, finance lease expense included amortization of right of use assets in the amount of $1.2 million and $2.3 million (included in depreciation and amortization expense), respectively and interest on lease liabilities of $0.9 million and $1.8 million (included in interest expense), respectively. For each of the three and six months ended June 30, 2018, total finance lease expense related to the long-term power purchase agreement was included in cost of sales.

⁽²⁾  Operating and short-term lease expense were included as a component of operation and maintenance for the three and six months ended June 30, 2019 and 2018.

⁽³⁾  Prior to our adoption of Topic 842 on January 1, 2019, all cash flows related to the finance lease were recorded as a component of operating cash flows.

⁽⁴⁾  Because our operating leases do not provide an implicit rate of return, we used the fully collateralized incremental borrowing rates based upon information available for similarly rated companies in determining the present value of lease payments for our operating leases. For our financing lease, the rate implicit in the lease was readily determinable.

The following table summarizes our finance lease right of use asset, which was included in property, plant and equipment on our balance sheets:

(in millions)	June 30, 2019			December 31, 2018
Long-term power purchase commitment	$	140.3		$	140.3
Accumulated amortization	(123.7		)	(120.9		)
Total finance lease right of use asset/capital lease asset	$	16.6		$	19.4

Right of use assets related to operating leases were $44.7 million at June 30, 2019, and were included in other long-term assets on our balance sheets.

Future minimum lease payments under our operating leases and our finance lease, and the present value of our net minimum lease payments as of June 30, 2019, were as follows:

(in millions)	Total Operating Leases			Power Purchase Commitment
Six months ending December 31, 2019	$	2.7		$	4.1
2020	6.9			8.8
2021	4.9			9.4
2022	4.9			4.2
2023	5.0			—
2024	4.8			—
Thereafter	30.5			—
Total minimum lease payments	59.7			26.5
Less: Interest	(15.3		)	(5.5		)
Present value of minimum lease payments	44.4			21.0
Less: Short-term lease liabilities	(4.3		)	(5.6		)
Long-term lease liabilities	$	40.1		$	15.4

Short-term and long-term lease liabilities related to operating leases were included in other current liabilities and other long-term liabilities on the balance sheets, respectively.

At December 31, 2018, short-term and long-term liabilities under our capital lease were $4.9 million and $18.4 million, respectively. Short-term and long-term lease liabilities related to our finance/capital lease were included in current portion of long-term debt and long-term debt on the balance sheets, respectively.

Significant Judgments and Other Information

We are currently party to several easement agreements that allow us access to land we do not own for the purpose of constructing and maintaining certain electric power and natural gas equipment. The majority of payments we make related to easements relate to our wind farms. We have not classified our easements as leases because we view the entire parcel of land specified in our easement agreements to be the identified asset, not just that portion of the parcel that contains our easement. As such, we have concluded that we do not control the use of an identified asset related to our easement agreements, nor do we obtain substantially all of the economic benefits associated with these shared-use assets.

Related to our investment in the Two Creeks Solar Project, WPS, along with an unaffiliated utility, entered into several land leases in Manitowoc County, Wisconsin that commenced in the third quarter of 2019. The leases with unaffiliated parties are for a total of approximately 600 acres of land. Each lease has an initial term of 30 years with two optional 10-year extensions.

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MATERIALS, SUPPLIES, AND INVENTORIES

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

MATERIALS, SUPPLIES, AND INVENTORIES

MATERIALS, SUPPLIES, AND INVENTORIES

Our inventory consisted of:

(in millions)	June 30, 2019		December 31, 2018
Materials and supplies	$	236.0	$	226.6
Natural gas in storage	130.5		232.9
Fossil fuel	94.9		88.7
Total	$	461.4	$	548.2

PGL and NSG price natural gas storage injections at the calendar year average of the costs of natural gas supply purchased. Withdrawals from storage are priced on the LIFO cost method. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of natural gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation debit or credit. At June 30, 2019, we had a temporary LIFO liquidation debit of $2.9 million recorded within other current assets on our balance sheet. Due to seasonality requirements, PGL and NSG expect these interim reductions in LIFO layers to be replenished by year end.

Substantially all other materials and supplies, natural gas in storage, and fossil fuel inventories are recorded using the weighted-average cost method of accounting.

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INCOME TAXES

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:

	Three Months Ended June 30, 2019					Three Months Ended June 30, 2018
(in millions)	Amount			Effective Tax Rate		Amount			Effective Tax Rate
Statutory federal income tax	$	52.7		21.0	%	$	59.2		21.0	%
State income taxes net of federal tax benefit	15.6			6.2	%	17.7			6.3	%
Tax repairs	(30.4		)	(12.1	)%	(22.5		)	(8.0	)%
Federal excess deferred tax amortization	(7.5		)	(3.0	)%	1.5			0.5	%
Wind production tax credits	(6.2		)	(2.5	)%	(2.1		)	(0.7	)%
Excess tax benefits – stock options	(4.4		)	(1.7	)%	(1.0		)	(0.3	)%
Other	(4.6		)	(1.8	)%	(1.7		)	(0.7	)%
Total income tax expense	$	15.2		6.1	%	$	51.1		18.1	%

	Six Months Ended June 30, 2019					Six Months Ended June 30, 2018
(in millions)	Amount			Effective Tax Rate		Amount			Effective Tax Rate
Statutory federal income tax	$	154.6		21.0	%	$	159.7		21.0	%
State income taxes net of federal tax benefit	46.5			6.3	%	47.6			6.3	%
Tax repairs	(60.0		)	(8.1	)%	(48.0		)	(6.3	)%
Federal excess deferred tax amortization	(20.7		)	(2.8	)%	(14.0		)	(1.8	)%
Wind production tax credits	(19.6		)	(2.7	)%	(5.9		)	(0.8	)%
Excess tax benefits – stock options	(11.6		)	(1.6	)%	(1.9		)	(0.3	)%
Other	(9.0		)	(1.2	)%	1.9			0.2	%
Total income tax expense	$	80.2		10.9	%	$	139.4		18.3	%

The effective tax rates of 6.1% and 10.9% for the three and six months ended June 30, 2019, respectively, differ from the United States statutory federal income tax rate of 21%, primarily due to the flow through of tax repairs in connection with the Wisconsin rate settlement, the impact of the Tax Legislation, and wind production tax credits generated from recent acquisitions of wind generation facilities in our non-utility energy infrastructure segment, partially offset by state income taxes.

The effective tax rates of 18.1% and 18.3% for the three and six months ended June 30, 2018, respectively, differ from the United States statutory federal income tax rate of 21%, primarily due to the flow through of tax repairs in connection with the Wisconsin rate settlement and the impact of the Tax Legislation, partially offset by state income taxes.

The Tax Legislation, signed into law in December 2017, required our regulated utilities to remeasure their deferred income taxes and we began to amortize the resulting excess deferred income taxes beginning in 2018 in accordance with normalization requirements (see federal excess deferred tax amortization line above). See Note 23, Regulatory Environment, for more information about the Wisconsin rate settlement.

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FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price).

Fair value accounting rules provide a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 – Pricing inputs are observable, either directly or indirectly, but are not quoted prices included within Level 1. Level 2 includes those financial instruments that are valued using external inputs within models or other valuation methods.

Level 3 – Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methods that result in management's best estimate of fair value. Level 3 instruments include those that may be more structured or otherwise tailored to customers' needs.

Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. We use a mid-market pricing convention (the mid-point between bid and ask prices) as a practical measure for valuing certain derivative assets and liabilities. We primarily use a market approach for recurring fair value measurements and attempt to use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs.

When possible, we base the valuations of our financial assets and liabilities on quoted prices for identical assets and liabilities in active markets. These valuations are classified in Level 1. The valuations of certain contracts not classified as Level 1 may be based on quoted market prices received from counterparties and/or observable inputs for similar instruments. Transactions valued using these inputs are classified in Level 2. Certain derivatives are categorized in Level 3 due to the significance of unobservable or internally-developed inputs.

We recognize transfers between levels of the fair value hierarchy at their value as of the end of the reporting period.

The following tables summarize our financial assets and liabilities that were accounted for at fair value on a recurring basis, categorized by level within the fair value hierarchy:

	June 30, 2019
(in millions)	Level 1		Level 2		Level 3		Total
Derivative assets
Natural gas contracts	$	2.6	$	2.0	$	—	$	4.6
FTRs	—		—		10.4		10.4
Coal contracts	—		0.8		—		0.8
Total derivative assets	$	2.6	$	2.8	$	10.4	$	15.8
Investments held in rabbi trust	$	77.1	$	—	$	—	$	77.1
Derivative liabilities
Natural gas contracts	$	23.8	$	0.5	$	—	$	24.3
Coal contracts	—		0.1		—		0.1
Interest rate swaps	—		6.7		—		6.7
Total derivative liabilities	$	23.8	$	7.3	$	—	$	31.1

	December 31, 2018
(in millions)	Level 1		Level 2		Level 3		Total
Derivative assets
Natural gas contracts	$	6.3	$	1.8	$	—	$	8.1
FTRs	—		—		7.4		7.4
Coal contracts	—		0.4		—		0.4
Total derivative assets	$	6.3	$	2.2	$	7.4	$	15.9
Investments held in rabbi trust	$	65.0	$	—	$	—	$	65.0
Derivative liabilities
Natural gas contracts	$	4.7	$	0.8	$	—	$	5.5
Coal contracts	—		0.1		—		0.1
Interest rate swaps	—		2.3		—		2.3
Total derivative liabilities	$	4.7	$	3.2	$	—	$	7.9

The derivative assets and liabilities listed in the tables above include options, swaps, futures, physical commodity contracts, and other instruments used to manage market risks related to changes in commodity prices and interest rates. They also include FTRs, which are used to manage electric transmission congestion costs in the MISO Energy and Operating Reserves Markets.

We hold investments in the Integrys rabbi trust. These investments are restricted as they can only be withdrawn from the trust to fund participants' benefits under the Integrys deferred compensation plan and certain Integrys non-qualified pension plans. These investments are included in other long-term assets on our balance sheets. For the three months ended June 30, 2019 and 2018, the net unrealized gains included in earnings related to the investments held at the end of the period were $2.8 million and $3.5 million, respectively. For the six months ended June 30, 2019 and 2018, the net unrealized gains included in earnings related to the investments held at the end of the period were $11.4 million and $0.4 million, respectively.

The following table summarizes the changes to derivatives classified as Level 3 in the fair value hierarchy:

	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Balance at the beginning of the period	$	3.1		$	1.5		$	7.4		$	4.4
Purchases	12.8			18.4			12.8			18.4
Settlements	(5.5		)	(3.2		)	(9.8		)	(6.1		)
Balance at the end of the period	$	10.4		$	16.7		$	10.4		$	16.7

Fair Value of Financial Instruments

The following table shows the financial instruments included on our balance sheets that were not recorded at fair value:

	June 30, 2019				December 31, 2018
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Preferred stock of subsidiary	$	30.4	$	28.2	$	30.4	$	28.3
Long-term debt, including current portion *	10,666.5		11,543.4		10,335.7		10,554.9

* The carrying amount of long-term debt excludes finance and capital lease obligations of $21.0 million and $23.3 million at June 30, 2019 and December 31, 2018, respectively.

The fair values of our long-term debt and preferred stock are categorized within Level 2 of the fair value hierarchy.

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DERIVATIVE INSTRUMENTS

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS

DERIVATIVE INSTRUMENTS

We use derivatives as part of our risk management program to manage the risks associated with the price volatility of interest rates, purchased power, generation, and natural gas costs for the benefit of our customers and shareholders. Our approach is non-speculative and designed to mitigate risk. Regulated hedging programs are approved by our state regulators.

We record derivative instruments on our balance sheets as an asset or liability measured at fair value unless they qualify for the normal purchases and sales exception and are so designated. We continually assess our contracts designated as normal and will discontinue the treatment of these contracts as normal if the required criteria are no longer met. Changes in the derivative's fair value are recognized currently in earnings unless specific hedge accounting criteria are met or we receive regulatory treatment for the derivative. For most energy-related physical and financial contracts in our regulated operations that qualify as derivatives, our regulators allow the effects of fair value accounting to be offset to regulatory assets and liabilities.

None of our derivatives are designated as hedging instruments, with the exception of our interest rate swaps, which have been designated as cash flow hedges. The following table shows our derivative assets and derivative liabilities:

	June 30, 2019				December 31, 2018
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
Other current
Natural gas contracts	$	4.6	$	22.5	$	7.7	$	5.3
FTRs	10.4		—		7.4		—
Coal contracts	0.5		0.1		0.2		0.1
Interest rate swaps	—		1.9		—		0.4
Total other current *	$	15.5	$	24.5	$	15.3	$	5.8
Other long-term
Natural gas contracts	$	—	$	1.8	$	0.4	$	0.2
Coal contracts	0.3		—		0.2		—
Interest rate swaps	—		4.8		—		1.9
Total other long-term *	$	0.3	$	6.6	$	0.6	$	2.1
Total	$	15.8	$	31.1	$	15.9	$	7.9

* On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.

Realized gains (losses) on derivatives not designated as hedging instruments are primarily recorded in cost of sales on the income statements. Our estimated notional sales volumes and realized gains (losses) were as follows:

	Three Months Ended June 30, 2019				Three Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	43.8 Dth	$	(3.1	)	39.9 Dth	$	(2.3	)
Petroleum products contracts	— gallons	—			1.7 gallons	0.3
FTRs	8.0 MWh	3.0			6.8 MWh	3.9
Total		$	(0.1	)		$	1.9

	Six Months Ended June 30, 2019				Six Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	99.9 Dth	$	(3.6	)	88.0 Dth	$	(7.5	)
Petroleum products contracts	— gallons	—			3.8 gallons	0.8
FTRs	16.1 MWh	5.3			15.0 MWh	7.6
Total		$	1.7			$	0.9

On our balance sheets, the amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral are not offset against the fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. At June 30, 2019 and December 31, 2018, we had posted cash collateral of $30.2 million and $2.7 million, respectively, in our margin accounts. These amounts were recorded on our balance sheets in other current assets. At December 31, 2018, we had also received cash collateral of $0.2 million in our margin accounts. This amount was recorded on our balance sheet in other current liabilities. We had not received any cash collateral at June 30, 2019.

The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:

	June 30, 2019							December 31, 2018
(in millions)	Derivative Assets			Derivative Liabilities				Derivative Assets				Derivative Liabilities
Gross amount recognized on the balance sheet	$	15.8		$	31.1			$	15.9			$	7.9
Gross amount not offset on the balance sheet	(3.0		)	(24.2		)	(1)	(4.0		)	(2)	(4.9		)	(3)
Net amount	$	12.8		$	6.9			$	11.9			$	3.0

⁽¹⁾   Includes cash collateral posted of $21.2 million.

⁽²⁾   Includes cash collateral received of $0.2 million.

⁽³⁾   Includes cash collateral posted of $1.1 million.

Cash Flow Hedges

Effective January 1, 2019, we adopted ASU 2017-12, Targeted Improvements to Accounting for Hedging Activities. The amendments in this update expand the strategies that qualify for hedge accounting, amend the presentation and disclosure requirements related to hedging activities, and provide overall targeted improvements to simplify hedge accounting in certain situations. The adoption of this standard did not have a significant impact on our financial statements.

As of June 30, 2019, we had two interest rate swaps with a combined notional value of $250.0 million to hedge the variable interest rate risk associated with our 2007 Junior Notes. The swaps provide a fixed interest rate of 4.9765% on $250.0 million of the $500.0 million of outstanding 2007 Junior Notes through November 15, 2021. As these swaps qualified for cash flow hedge accounting treatment, the related gains and losses are being deferred in accumulated other comprehensive loss and are being amortized to interest expense as interest is accrued on the 2007 Junior Notes.

We previously entered into forward interest rate swap agreements to mitigate the interest rate exposure associated with the issuance of long-term debt related to the acquisition of Integrys. These swap agreements were settled in 2015, and we continue to amortize amounts out of accumulated other comprehensive loss into interest expense over the periods in which the interest costs are recognized in earnings.

The table below shows the amounts related to these cash flow hedges recorded in other comprehensive loss and in earnings, along with our total interest expense on the income statements:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2019			2018		2019			2018
Derivative losses recognized in other comprehensive loss	$	(3.2	)	$	—	$	(4.8	)	$	—
Net derivative gains reclassified from accumulated other comprehensive loss to interest expense	0.4			0.5		0.8			1.1
Total interest expense line item on the income statements	124.1			108.5		248.5			215.2

We estimate that during the next twelve months $0.3 million will be reclassified from accumulated other comprehensive loss as a reduction to interest expense.

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GUARANTEES

6 Months Ended

Jun. 30, 2019

Guarantees [Abstract]

GUARANTEES

GUARANTEES

The following table shows our outstanding guarantees:

			Expiration
(in millions)	Total Amounts Committed at June 30, 2019		Less Than 1 Year		1 to 3 Years		Over 3 Years
Guarantees
Guarantees supporting commodity transactions of subsidiaries (1)	$	6.7	$	6.7	$	—	$	—
Standby letters of credit (2)	101.3		1.0		0.2		100.1
Surety bonds (3)	9.7		9.6		0.1		—
Other guarantees (4)	10.4		—		0.9		9.5
Total guarantees	$	128.1	$	17.3	$	1.2	$	109.6

⁽¹⁾  Includes $2.7 million and $4.0 million to support the business operations of Bluewater and UMERC, respectively.

⁽²⁾  At our request or the request of our subsidiaries, financial institutions have issued standby letters of credit for the benefit of third parties that have extended credit to our subsidiaries. These amounts are not reflected on our balance sheets.

⁽³⁾  Primarily for workers compensation self-insurance programs and obtaining various licenses, permits, and rights-of-way. These amounts are not reflected on our balance sheets.

⁽⁴⁾ 

Consists of $10.4 million related to other indemnifications, for which a liability of $9.5 million related to workers compensation coverage was recorded on our balance sheets.

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EMPLOYEE BENEFITS

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS

The following tables show the components of net periodic pension and OPEB costs for our benefit plans.

	Pension Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	11.8		$	11.8		$	23.1		$	23.8
Interest cost	30.2			28.7			60.8			57.0
Expected return on plan assets	(48.2		)	(48.8		)	(96.9		)	(98.4		)
Loss on plan settlement	1.0			0.3			1.8			0.7
Amortization of prior service cost	0.5			0.6			1.1			1.3
Amortization of net actuarial loss	18.7			23.9			37.7			47.0
Net periodic benefit cost	$	14.0		$	16.5		$	27.6		$	31.4

	OPEB Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	3.8		$	5.6		$	8.2		$	11.8
Interest cost	6.3			7.4			12.8			14.9
Expected return on plan assets	(13.6		)	(14.8		)	(27.3		)	(29.7		)
Amortization of prior service credit	(3.8		)	(3.9		)	(7.7		)	(7.7		)
Amortization of net actuarial (gain) loss	(2.0		)	0.2			(2.7		)	0.5
Net periodic benefit credit	$	(9.3	)	$	(5.5	)	$	(16.7	)	$	(10.2	)

During the six months ended June 30, 2019, we made contributions and payments of $6.9 million related to our pension plans and $1.4 million related to our OPEB plans. We expect to make contributions and payments of $4.9 million related to our pension plans and $5.3 million related to our OPEB plans during the remainder of 2019, dependent upon various factors affecting us, including our liquidity position and the effects of the Tax Legislation.

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GOODWILL

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL

GOODWILL

Goodwill represents the excess of the cost of an acquisition over the fair value of the identifiable net assets acquired. The table below shows our goodwill balances by segment for the six months ended June 30, 2019. We had no changes to the carrying amount of goodwill during the six months ended June 30, 2019.

(in millions)	Wisconsin		Illinois		Other States		Non-Utility Energy Infrastructure		Total
Goodwill balance *	$	2,104.3	$	758.7	$	183.2	$	6.6	$	3,052.8

*

We had no accumulated impairment losses related to our goodwill as of June 30, 2019.

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INVESTMENT IN TRANSMISSION AFFILIATES

6 Months Ended

Jun. 30, 2019

Equity Method Investments and Joint Ventures [Abstract]

INVESTMENT IN TRANSMISSION AFFILIATES

INVESTMENT IN TRANSMISSION AFFILIATES

We own approximately 60% of ATC, a for-profit, transmission-only company regulated by the FERC for cost of service and certain state regulatory commissions for routing and siting of transmission projects. We also own approximately 75% of ATC Holdco, a separate entity formed in December 2016 to invest in transmission-related projects outside of ATC's traditional footprint. The following tables provide a reconciliation of the changes in our investments in ATC and ATC Holdco:

	Three Months Ended June 30, 2019
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,630.6	$	40.0		$	1,670.6
Add: Earnings (loss) from equity method investment	37.4		(0.5		)	36.9
Add: Capital contributions	18.1		0.4			18.5
Less: Distributions	29.4		—			29.4
Less: Other	0.1		—			0.1
Balance at end of period	$	1,656.6	$	39.9		$	1,696.5

	Three Months Ended June 30, 2018
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,561.1	$	37.8		$	1,598.9
Add: Earnings (loss) from equity method investment	29.8		(1.1		)	28.7
Add: Capital contributions	18.1		1.5			19.6
Less: Distributions	50.7		—			50.7
Add: Other	0.1		—			0.1
Balance at end of period	$	1,558.4	$	38.2		$	1,596.6

	Six Months Ended June 30, 2019
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,625.3	$	40.0		$	1,665.3
Add: Earnings (loss) from equity method investment	73.9		(0.9		)	73.0
Add: Capital contributions	21.1		0.8			21.9
Less: Distributions	63.6		—			63.6
Less: Other	0.1		—			0.1
Balance at end of period	$	1,656.6	$	39.9		$	1,696.5

	Six Months Ended June 30, 2018
(in millions)	ATC			ATC Holdco			Total
Balance at beginning of period	$	1,515.8	(1)	$	37.6		$	1,553.4
Add: Earnings (loss) from equity method investment	63.2			(1.7		)	61.5
Add: Capital contributions	30.1			2.3			32.4
Less: Distributions	50.7		(2)	—			50.7
Balance at end of period	$	1,558.4		$	38.2		$	1,596.6

⁽¹⁾  Distributions of $39.9 million, received in the first quarter of 2018, were approved and recorded as a receivable from ATC in other current assets at December 31, 2017.

⁽²⁾  Distributions of $24.2 million, received in the third quarter of 2018, were approved and recorded as a receivable from ATC in accounts receivable at June 30, 2018.

We pay ATC for network transmission and other related services it provides. In addition, we provide a variety of operational, maintenance, and project management work for ATC, which is reimbursed by ATC. We are required to pay the cost of needed transmission infrastructure upgrades for new generation projects while the projects are under construction. ATC reimburses us for these costs when the new generation is placed in service.

The following table summarizes our significant related party transactions with ATC:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Charges to ATC for services and construction	$	3.3	$	4.1	$	7.3	$	8.7
Charges from ATC for network transmission services	87.0		84.6		174.1		169.1
Refund from ATC related to a FERC audit	—		22.0		—		22.0

Our balance sheets included the following receivables and payables for services received from or provided to ATC:

(in millions)	June 30, 2019		December 31, 2018
Accounts receivable for services provided to ATC	$	2.3	$	3.4
Accounts payable for services received from ATC	29.0		28.2
Amounts due from ATC for transmission infrastructure upgrades*	—		29.4

* In connection with UMERC's construction of the new natural gas-fired generation in the Upper Peninsula of Michigan, UMERC was required to initially fund the construction of the transmission infrastructure upgrades owned by ATC that are needed for the new generation. In the second quarter of 2019, ATC fully reimbursed UMERC for these costs.

Summarized financial data for ATC is included in the following tables:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Income statement data
Operating revenues	$	182.2	$	165.5	$	359.9	$	330.9
Operating expenses	93.6		91.5		184.0		176.4
Other expense, net	28.6		25.4		57.4		53.0
Net income	$	60.0	$	48.6	$	118.5	$	101.5

(in millions)	June 30, 2019		December 31, 2018
Balance sheet data
Current assets	$	88.8	$	87.2
Noncurrent assets	5,100.7		4,928.8
Total assets	$	5,189.5	$	5,016.0
Current liabilities	$	562.1	$	640.0
Long-term debt	2,213.0		2,014.0
Other noncurrent liabilities	294.4		295.3
Shareholders' equity	2,120.0		2,066.7
Total liabilities and shareholders' equity	$	5,189.5	$	5,016.0

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SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

We use operating income to measure segment profitability and to allocate resources to our businesses. At June 30, 2019, we reported six segments, which are described below.

• The Wisconsin segment includes the electric and natural gas utility operations of WE, WG, WPS, and UMERC.

• The Illinois segment includes the natural gas utility and non-utility operations of PGL and NSG.

• The other states segment includes the natural gas utility and non-utility operations of MERC and MGU.

• The electric transmission segment includes our approximate 60% ownership interest in ATC, a for-profit, transmission-only company regulated by the FERC for cost of service and certain state regulatory commissions for routing and siting of transmission projects, and our approximate 75% ownership interest in ATC Holdco, which invests in transmission-related projects outside of ATC's traditional footprint.

• The non-utility energy infrastructure segment includes:

◦ We Power, which owns and leases generating facilities to WE,

◦ Bluewater, which owns underground natural gas storage facilities in Michigan that provide approximately one-third of the current storage needs for our Wisconsin natural gas utilities,

◦ Our 90% membership interest in Bishop Hill III, a wind generating facility located in Henry County, Illinois,

◦ Our 80% membership interest in Coyote Ridge, a wind generating facility under construction in Brookings County, South Dakota, and

◦ Our 80% membership interest in Upstream, a wind generating facility located in Antelope County, Nebraska.

See Note 2, Acquisitions, for more information on Bishop Hill III, Coyote Ridge, and Upstream.

• The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the Peoples Energy, LLC holding company, Wispark LLC, Wisvest LLC, Wisconsin Energy Capital Corporation, WEC Business Services LLC, and PDL.

All of our operations are located within the United States. The following tables show summarized financial information related to our reportable segments for the three and six months ended June 30, 2019 and 2018:

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
June 30, 2019
External revenues	$	1,253.3	$	242.9	$	68.8	$	1,565.0	$	—	$	24.3	$	0.9		$	—		$	1,590.2
Intersegment revenues	—		—		—		—		—		99.0		—			(99.0		)	—
Other operation and maintenance	363.9		107.0		23.4		494.3		—		6.8		1.8			0.7			503.6
Depreciation and amortization	152.9		45.0		6.7		204.6		—		22.9		6.0			(3.6		)	229.9
Operating income (loss)	270.2		42.6		4.6		317.4		—		91.3		(7.1		)	(87.0		)	314.6
Equity in earnings of transmission affiliates	—		—		—		—		36.9		—		—			—			36.9
Interest expense	142.7		13.9		1.9		158.5		2.7		15.5		36.5			(89.1		)	124.1

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
June 30, 2018
External revenues	$	1,325.5	$	268.0	$	72.4	$	1,665.9	$	—	$	3.5	$	3.1		$	—		$	1,672.5
Intersegment revenues	—		—		—		—		—		113.5		—			(113.5		)	—
Other operation and maintenance	502.4		104.1		24.9		631.4		—		4.5		2.2			(100.4		)	537.7
Depreciation and amortization	134.6		41.8		4.5		180.9		—		18.3		7.5			—			206.7
Operating income (loss)	195.1		41.7		8.1		244.9		—		92.4		(6.5		)	—			330.8
Equity in earnings of transmission affiliates	—		—		—		—		28.7		—		—			—			28.7
Interest expense	48.5		12.3		2.1		62.9		—		16.0		30.3			(0.7		)	108.5

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended
June 30, 2019
External revenues	$	2,886.7	$	779.4	$	254.0	$	3,920.1	$	—	$	44.9	$	2.6		$	—		$	3,967.6
Intersegment revenues	—		—		—		—		—		206.2		—			(206.2		)	—
Other operation and maintenance	756.6		235.2		51.0		1,042.8		—		10.6		0.8			—			1,054.2
Depreciation and amortization	303.9		89.5		13.2		406.6		—		45.5		12.4			(8.2		)	456.3
Operating income (loss)	632.0		180.5		46.1		858.6		—		184.0		(11.0		)	(174.2		)	857.4
Equity in earnings of transmission affiliates	—		—		—		—		73.0		—		—			—			73.0
Interest expense	286.1		28.7		4.2		319.0		5.3		31.2		71.6			(178.6		)	248.5

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended
June 30, 2018
External revenues	$	2,914.6	$	775.3	$	242.3	$	3,932.2	$	—	$	22.3	$	4.5		$	—		$	3,959.0
Intersegment revenues	—		—		—		—		—		212.8		—			(212.8		)	—
Other operation and maintenance	970.9		216.3		51.5		1,238.7		—		6.2		1.9			(197.2		)	1,049.6
Depreciation and amortization	269.7		82.7		11.1		363.5		—		36.6		15.2			—			415.3
Operating income (loss)	468.8		189.3		44.3		702.4		—		185.4		(11.9		)	—			875.9
Equity in earnings of transmission affiliates	—		—		—		—		61.5		—		—			—			61.5
Interest expense	97.9		24.6		4.2		126.7		—		32.1		58.3			(1.9		)	215.2

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VARIABLE INTEREST ENTITIES

6 Months Ended

Jun. 30, 2019

Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Determination Methodology and Factors [Abstract]

VARIABLE INTEREST ENTITIES

VARIABLE INTEREST ENTITIES

The primary beneficiary of a variable interest entity must consolidate the entity's assets and liabilities. In addition, certain disclosures are required for significant interest holders in variable interest entities.

We assess our relationships with potential variable interest entities, such as our coal suppliers, natural gas suppliers, coal transporters, natural gas transporters, and other counterparties related to power purchase agreements, investments, and joint ventures. In making this assessment, we consider, along with other factors, the potential that our contracts or other arrangements provide subordinated financial support, the obligation to absorb the entity's losses, the right to receive residual returns of the entity, and the power to direct the activities that most significantly impact the entity's economic performance.

Investment in Transmission Affiliates

We own approximately 60% of ATC, a for-profit, electric transmission company regulated by the FERC and certain state regulatory commissions. We have determined that ATC is a variable interest entity but consolidation is not required since we are not ATC's primary beneficiary. As a result of our limited voting rights, we do not have the power to direct the activities that most significantly impact ATC's economic performance. Therefore, we account for ATC as an equity method investment. At June 30, 2019 and December 31, 2018, our equity investment in ATC was $1,656.6 million and $1,625.3 million, respectively, which approximates our maximum exposure to loss as a result of our involvement with ATC.

We also own approximately 75% of ATC Holdco, a separate entity formed in December 2016 to invest in transmission-related projects outside of ATC's traditional footprint. We have determined that ATC Holdco is a variable interest entity but consolidation is not required since we are not ATC Holdco's primary beneficiary. As a result of our limited voting rights, we do not have the power to direct the activities that most significantly impact ATC Holdco's economic performance. Therefore, we account for ATC Holdco as an equity method investment. At June 30, 2019 and December 31, 2018, our equity investment in ATC Holdco was $39.9 million and $40.0 million, respectively, which approximates our maximum exposure to loss as a result of our involvement with ATC Holdco.

See Note 18, Investment in Transmission Affiliates, for more information, including any significant assets and liabilities related to ATC and ATC Holdco recorded on our balance sheets.

Power Purchase Agreement

We have a power purchase agreement that represents a variable interest. This agreement is for 236 MWs of firm capacity from a natural gas-fired cogeneration facility, and we account for it as a finance lease. The agreement includes no minimum energy requirements over the remaining term of approximately three years. We have examined the risks of the entity, including operations, maintenance, dispatch, financing, fuel costs, and other factors, and have determined that we are not the primary beneficiary of the entity. We do not hold an equity or debt interest in the entity, and there is no residual guarantee associated with the power purchase agreement.

We have $26.5 million of required capacity payments over the remaining term of this agreement. We believe that the required capacity payments under this contract will continue to be recoverable in rates, and our maximum exposure to loss is limited to these capacity payments.

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

We and our subsidiaries have significant commitments and contingencies arising from our operations, including those related to unconditional purchase obligations, environmental matters, and enforcement and litigation matters.

Unconditional Purchase Obligations

Our electric utilities have obligations to distribute and sell electricity to their customers, and our natural gas utilities have obligations to distribute and sell natural gas to their customers. The utilities expect to recover costs related to these obligations in future customer rates. In order to meet these obligations, we routinely enter into long-term purchase and sale commitments for various quantities and lengths of time.

Our non-utility energy infrastructure generation facilities have obligations to distribute and sell electricity through long-term offtake agreements with their customers for all of the energy produced. These projects also enter into related easements and other agreements associated with the generating facilities.

Our minimum future commitments related to these purchase obligations as of June 30, 2019, including those of our subsidiaries, were approximately $11.9 billion.

Environmental Matters

Consistent with other companies in the energy industry, we face significant ongoing environmental compliance and remediation obligations related to current and past operations. Specific environmental issues affecting us include, but are not limited to, current and future regulation of air emissions such as sulfur dioxide, nitrogen oxide, fine particulates, mercury, and GHGs; water intake and discharges; disposal of coal combustion products such as fly ash; and remediation of impacted properties, including former manufactured gas plant sites.

Air Quality

National Ambient Air Quality Standards

After completing its review of the 2008 ozone standard, the EPA released a final rule in October 2015, which lowered the limit for ground-level ozone, creating a more stringent standard than the 2008 National Ambient Air Quality Standards. The EPA issued final nonattainment area designations on May 1, 2018. The following counties within our service territories were designated as partial nonattainment: Door, Kenosha, Manitowoc, Northern Milwaukee/Ozaukee, and Sheboygan shorelines. The state of Wisconsin will need to develop a state implementation plan to bring these areas back into attainment. We will be required to comply with this state implementation plan no earlier than 2020. We believe we are well positioned to meet the requirements associated with the ozone standard and do not expect to incur significant costs to comply.

Mercury and Air Toxics Standards

In December 2018, the EPA proposed to revise the Supplemental Cost Finding for the MATS rule as well as the CAA required RTR. The EPA was required by the United States Supreme Court to review both costs and benefits of complying with the MATS rule. After its review of costs, the EPA determined that it is not appropriate and necessary to regulate hazardous air pollutant emissions from power plants under Section 112 of the CAA. As a result, under the proposed rule, the emission standards and other requirements of the MATS rule first enacted in 2012 would remain in place. The EPA is not proposing to remove coal-and oil-fired power plants from the list of sources that are regulated under Section 112. The EPA also proposes that no revisions to MATS are warranted based on the results of the RTR. As a result, we do not expect the proposed rule to have a material impact on our financial condition or operations.

Climate Change

In July 2019, the EPA published the ACE rule, which provides existing coal-fired generating units with standards for achieving GHG emission reductions. The rule was finalized in conjunction with two other separate and distinct rulemakings, (1) the repeal of the Clean Power Plan, and (2) revised implementing regulations for ACE, ongoing emissions guidelines, and all future emission guidelines for existing sources issued under CAA section 111(d). Every state's plan to implement ACE would need to focus on reducing GHG emissions by improving the efficiency of fossil-fueled power plants. The rule is being litigated.

In December 2018, the EPA proposed to revise the New Source Performance Standards for GHG emissions from new, modified, and reconstructed fossil-fueled power plants. The EPA determined that the BSER for new, modified, and reconstructed coal units is highly efficient generation that would be equivalent to supercritical steam conditions for larger units and subcritical steam conditions for smaller units. This proposed BSER would replace the determination from the previous rule, which identified BSER as partial carbon capture and storage.

In April 2019, we issued a climate report, which analyzes our GHG reduction goals with respect to international efforts to limit future global temperature increases to less than two degrees Celsius. We will continue to update this analysis as climate-change policies and relevant technologies evolve over time with a focus on preserving fuel diversity, lowering costs for customers, and reducing long-term GHG emissions.

Our plan is to work with our industry peers, environmental groups, public policy makers, and customers, with goals of reducing CO₂ emissions by approximately 40% and 80% below 2005 levels by 2030 and 2050, respectively. As a result of our generation reshaping plan, we retired approximately 1,800 MW of coal generation since the beginning of 2018. This plan included the March 31, 2019 retirement of the PIPP as well as the 2018 retirements of the Pleasant Prairie power plant, the Pulliam power plant, and the jointly-owned Edgewater Unit 4 generating units. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP.

Water Quality

Clean Water Act Cooling Water Intake Structure Rule

In August 2014, the EPA issued a final regulation under Section 316(b) of the Clean Water Act that requires the location, design, construction, and capacity of cooling water intake structures at existing power plants to reflect the BTA for minimizing adverse environmental impacts. The rule became effective in October 2014 and applies to all of our existing generating facilities with cooling water intake structures, except for the ERGS units, which were permitted under the rules governing new facilities.

We have received BTA determinations for Weston Units 2, 3, and 4 and Valley power plant. Although we currently believe that existing technologies at Port Washington Generating Station and OC 5 through OC 8 satisfy the BTA requirements, final determinations will not be made until discharge permits are renewed for these units. Until that time, we cannot determine what, if any, intake structure or operational modifications will be required to meet the new BTA requirements for these units.

We also provided information to the Wisconsin Department of Natural Resources and the MDEQ about generating unit retirements. Following discussions with the MDEQ, in January 2019, we submitted a signed certification stating that the PIPP would be retired no later than June 1, 2019. The PIPP was retired on March 31, 2019.

As a result of past capital investments completed to address 316(b) compliance at WE and WPS, we believe our fleet overall is well positioned to meet the regulation and do not expect to incur significant costs to comply with this regulation.

Steam Electric Effluent Limitation Guidelines

The EPA's final ELG rule took effect in January 2016. This rule created new requirements for several types of power plant wastewaters. The two new requirements that affect WE and WPS relate to discharge limits for BATW and wet FGD wastewater.

This rule is being litigated, and various petitions challenging it were consolidated in the United States Court of Appeals for the Fifth Circuit. In April 2017, the EPA issued an administrative stay of certain compliance deadlines while further reviewing the rule. In September 2017, the EPA issued a final rule (Postponement Rule) to postpone the earliest compliance date to November 1, 2020 for the BATW and wet FGD wastewater requirements. The latest ELG rule compliance date remains December 31, 2023 for any new wastewater treatment requirements contained in power plant discharge permits.

As a result of past capital investments completed to address ELG compliance at WE and WPS, we believe our fleet overall is well positioned to meet the regulations. Our power plant facilities already have advanced wastewater treatment technologies installed that meet many of the discharge limits established by this rule. However, in its current form, the ELG rule would require additional wastewater treatment retrofits and the installation of other equipment to minimize process water use. Due to completed generating unit retirements, we believe the only facilities that would require bottom ash system modifications are Weston Unit 3 and OC 7 and OC 8. One wastewater treatment system modification may be required for the wet FGD discharges from the six units that make up the OCPP and ERGS. Based on preliminary engineering, the estimated rule compliance cost is approximately $70 million.

Land Quality

Manufactured Gas Plant Remediation

We have identified sites at which our utilities or a predecessor company owned or operated a manufactured gas plant or stored manufactured gas. We have also identified other sites that may have been impacted by historical manufactured gas plant activities. Our natural gas utilities are responsible for the environmental remediation of these sites, some of which are in the EPA Superfund Alternative Approach Program. We are also working with various state jurisdictions in our investigation and remediation planning. These sites are at various stages of investigation, monitoring, remediation, and closure.

In addition, we are coordinating the investigation and cleanup of some of these sites subject to the jurisdiction of the EPA under what is called a "multisite" program. This program involves prioritizing the work to be done at the sites, preparation and approval of documents common to all of the sites, and use of a consistent approach in selecting remedies. At this time, we cannot estimate future remediation costs associated with these sites beyond those described below.

The future costs for detailed site investigation, future remediation, and monitoring are dependent upon several variables including, among other things, the extent of remediation, changes in technology, and changes in regulation. Historically, our regulators have allowed us to recover incurred costs, net of insurance recoveries and recoveries from potentially responsible parties, associated with the remediation of manufactured gas plant sites. Accordingly, we have established regulatory assets for costs associated with these sites.

We have established the following regulatory assets and reserves related to manufactured gas plant sites:

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets	$	707.6	$	687.1
Reserves for future remediation	631.8		616.4

Consent Decrees

Wisconsin Public Service Corporation Consent Decree – Weston and Pulliam Power Plants

In November 2009, the EPA issued an NOV to WPS, which alleged violations of the CAA's New Source Review requirements relating to certain projects completed at the Weston and Pulliam power plants from 1994 to 2009. WPS entered into a Consent Decree with the EPA resolving this NOV. This Consent Decree was entered by the United States District Court for the Eastern District of Wisconsin in March 2013. WPS retired Pulliam Units 7 and 8 in October 2018. WPS also completed the mitigation projects required and received a completeness letter from the EPA in October 2018. We have started the process to terminate the WPS Consent Decree.

Joint Ownership Power Plants Consent Decree – Columbia and Edgewater

In December 2009, the EPA issued an NOV to Wisconsin Power and Light, the operator of the Columbia and Edgewater plants, and the other joint owners of these plants, including Madison Gas and Electric, WE (former co-owner of an Edgewater unit), and WPS. The NOV alleged violations of the CAA's New Source Review requirements related to certain projects completed at those plants. WPS, along with Wisconsin Power and Light, Madison Gas and Electric, and WE, entered into a Consent Decree with the EPA resolving this NOV. This Consent Decree was entered by the United States District Court for the Western District of Wisconsin in June 2013. As a result of the continued implementation of the Consent Decree related to the jointly owned Columbia and Edgewater plants, the Edgewater 4 generating unit was retired in September 2018.

Enforcement and Litigation Matters

We and our subsidiaries are involved in legal and administrative proceedings before various courts and agencies with respect to matters arising in the ordinary course of business. Although we are unable to predict the outcome of these matters, management believes that appropriate reserves have been established and that final settlement of these actions will not have a material effect on our financial condition or results of operations.

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SUPPLEMENTAL CASH FLOW INFORMATION

6 Months Ended

Jun. 30, 2019

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

SUPPLEMENTAL CASH FLOW INFORMATION

SUPPLEMENTAL CASH FLOW INFORMATION

	Six Months Ended June 30
(in millions)	2019			2018
Cash (paid) for interest, net of amount capitalized	$	(247.9	)	$	(215.6	)
Cash (paid) for income taxes, net	(15.1		)	(47.6		)
Significant non-cash investing and financing transactions:
Accounts payable related to construction costs	137.3			77.4
Non-cash capital contributions from noncontrolling interest	10.2			—

The statements of cash flows include our activity related to cash, cash equivalents, and restricted cash. Our restricted cash primarily consists of the cash held in the Integrys rabbi trust, which is used to fund participants' benefits under the Integrys deferred compensation plan and certain Integrys non-qualified pension plans. All assets held within the rabbi trust are restricted as they can only be withdrawn from the trust to make qualifying benefit payments. Our restricted cash also includes the restricted cash we received when we acquired ownership interests in Bishop Hill III and Upstream during August 2018 and January 2019, respectively. This cash is restricted as it can only be used to pay for any remaining costs associated with the construction of these wind generation facilities. See Note 2, Acquisitions, for more information on the acquisitions of Bishop Hill III and Upstream.

The following table reconciles the cash, cash equivalents, and restricted cash amounts reported within the balance sheets at June 30 to the total of these amounts shown on the statements of cash flows:

(in millions)	2019		2018
Cash and cash equivalents	$	37.9	$	29.8
Restricted cash included in other long term assets	52.8		22.2
Cash, cash equivalents, and restricted cash	$	90.7	$	52.0

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REGULATORY ENVIRONMENT

6 Months Ended

Jun. 30, 2019

Regulated Operations [Abstract]

REGULATORY ENVIRONMENT

REGULATORY ENVIRONMENT

Wisconsin Electric Power Company, Wisconsin Gas LLC, and Wisconsin Public Service Corporation

2020 and 2021 Rates

In March 2019, WE, WG, and WPS filed applications with the PSCW to increase their retail electric, natural gas, and steam rates, as applicable, effective January 1, 2020. The WE and WPS proposals are targeting effective electric rate increases of approximately $83 million (2.9%) and $49 million (4.9%), respectively, in 2020, and additional increases of $83 million (2.9%) and $49 million (4.9%), respectively, in 2021. For WE’s, WG’s, and WPS’s natural gas customers, the proposals are targeting effective rate increases of approximately $15 million (3.9%), $11 million (1.8%), and $7 million (2.4%), respectively, in 2020. WPS is proposing an additional effective natural gas rate increase of $7 million (2.4%) in 2021. The WE proposal also targets a $1 million (4.5%) effective increase in its steam rates in 2020. The proposals for WE, WG, and WPS reflect a ROE of 10.35%, 10.30%, and 10.35%, respectively. All three of these Wisconsin utilities proposed a common equity component average of 52.0% on a financial basis and proposed to continue having an earnings sharing mechanism through 2021.

The proposed increase in electric rates at WE was driven by higher transmission charges, recovery of SSR revenues that were assumed in WE's 2015 rate order but were not received, and an increase in costs associated with a purchased power agreement previously approved by the PSCW. WE's proposed electric rates reflect its request to partially offset these increases with approximately $111 million of previously deferred tax benefits from the Tax Legislation. WE's proposal also includes its request for approval to continue collecting the carrying value of the Pleasant Prairie power plant and the PIPP using the current approved composite depreciation rates, in addition to a return on the remaining carrying value of the plants.

The proposed increase in electric rates at WPS was driven by the inclusion of WPS's SMRP, the Forward Wind Energy Center, and WPS's investments in two solar projects in rates, along with continued investments in system reliability and the recovery of various regulatory deferrals, including the deferral of the revenue requirement for ReACT™ costs above a previously authorized level. WPS's proposed electric rates reflect its request to use $40 million of previously deferred tax benefits from the Tax Legislation to partially offset these increases. WPS's proposal also includes its request for approval to continue collecting the carrying value of Pulliam units 7 and 8 and the Edgewater 4 generating unit using the current approved composite depreciation rates, in addition to a return on the remaining carrying value of the units.

The proposed increases at our Wisconsin natural gas utilities were driven by continued investment in our natural gas distribution systems. WPS’s proposed 2020 natural gas rate increase is net of approximately $7 million of previously deferred tax benefits from the Tax Legislation.

Final orders are expected from the PSCW by the end of 2019, with rates effective January 1, 2020.

2018 and 2019 Rates

During April 2017, WE, WG, and WPS filed an application with the PSCW for approval of a settlement agreement they made with several of their commercial and industrial customers regarding 2018 and 2019 base rates. In September 2017, the PSCW issued an order that approved the settlement agreement, which freezes base rates through 2019 for electric, natural gas, and steam customers of WE, WG, and WPS. Based on the PSCW order, the authorized ROE for WE, WG, and WPS remains at 10.2%, 10.3%, and 10.0%, respectively, and the current capital cost structure for all of our Wisconsin utilities will remain unchanged through 2019.

In addition to freezing base rates, the settlement agreement extends and expands the electric real-time market pricing program options for large commercial and industrial customers and mitigates the continued growth of certain escrowed costs at WE during the base rate freeze period by accelerating the recognition of certain tax benefits. WE will flow through the tax benefit of its repair-related deferred tax liabilities in 2018 and 2019, to maintain certain regulatory asset balances at their December 31, 2017 levels.

While WE would typically follow the normalization accounting method and utilize the tax benefits of the deferred tax liabilities in rate-making as an offset to rate base, benefiting customers over time, the federal tax code does allow for passing these tax repair-related benefits to ratepayers much sooner using the flow through accounting method. The flow through treatment of the repair-related deferred tax liabilities offsets the negative income statement impact of holding the regulatory assets level, resulting in no change to net income.

The agreement also allows WPS to extend through 2019, the deferral for the revenue requirement of ReACT™ costs above the authorized $275.0 million level, and other deferrals related to WPS's electric real-time market pricing program and network transmission expenses. The total cost of the ReACT™ project, excluding $51 million of AFUDC, was $342 million.

Pursuant to the settlement agreement, WPS also agreed to adopt, beginning in 2018, the earnings sharing mechanism that has been in place for WE and WG since January 2016, and all three utilities agreed to keep the mechanism in place through 2019. Under this earnings sharing mechanism, if WE, WG, or WPS earns above its authorized ROE, 50% of the first 50 basis points of additional utility earnings must be shared with customers. All utility earnings above the first 50 basis points must also be shared with customers.

Solar Generation Projects

On August 1, 2019, WE, along with an unaffiliated utility, filed an application with the PSCW for approval to acquire an ownership interest in Badger Hollow II, a solar project that will be located in Iowa County, Wisconsin. Subject to receipt of the PSCW's approval, WE will own 100 MW of the output of this project. WE's share of the cost of this project is estimated to be $130 million. Commercial operation for Badger Hollow II is targeted for the end of 2021.

On May 31, 2018, WPS, along with an unaffiliated utility, filed an application with the PSCW for approval to acquire ownership interests in two solar projects in Wisconsin. Badger Hollow I will be located in Iowa County, Wisconsin, and Two Creeks Solar Project will be located in Manitowoc County, Wisconsin. WPS will own 100 MW of the output of each project for a total of 200 MW. WPS's share of the cost of both projects is estimated to be $260 million. The PSCW approved the acquisition of these two projects in April 2019. Commercial operation for both projects is targeted for the end of 2020.

The Peoples Gas Light and Coke Company and North Shore Gas Company

Illinois Proceedings

In December 2015, the ICC ordered a series of stakeholder workshops to evaluate PGL's SMP. This ICC action did not impact PGL's ongoing work to modernize and maintain the safety of its natural gas distribution system, but it instead provided the ICC with an opportunity to analyze long-term elements of the program through the stakeholder workshops. The workshops were completed in March 2016. In July 2016, the ICC initiated a proceeding to review, among other things, the planning, reporting, and monitoring of the program, including the target end date for the program, and issued a final order in January 2018. The order did not have a significant impact on PGL's existing SMP design and execution. An appeal related to the final order was filed by the Illinois AG in April 2018. On June 28, 2019, the Illinois Appellate Court issued its ruling affirming the ICC’s final order.

Qualifying Infrastructure Plant Rider

In July 2013, Illinois Public Act 98-0057, The Natural Gas Consumer, Safety & Reliability Act, became law. This law provides PGL with a cost recovery mechanism that allows collection, through a surcharge on customer bills, of prudently incurred costs to upgrade Illinois natural gas infrastructure. In September 2013, PGL filed with the ICC requesting the proposed rider, which was approved in January 2014.

PGL's QIP rider is subject to an annual reconciliation whereby costs are reviewed for accuracy and prudency. In March 2019, PGL filed its 2018 reconciliation with the ICC, which, along with the 2017 and 2016 reconciliations, are still pending. In June 2019, PGL agreed to a settlement of the 2015 reconciliation, which includes a rate base reduction of $7.0 million and a $7.3 million refund to ratepayers. The ICC approved the settlement on July 17, 2019. The settlement will not have a material impact on earnings.

As of June 30, 2019, there can be no assurance that all costs incurred under PGL's QIP rider during the open reconciliation years will be deemed recoverable by the ICC.

Minnesota Energy Resources Corporation

2018 Minnesota Rate Case

In October 2017, MERC initiated a rate proceeding with the MPUC. In December 2018, the MPUC issued a final written order for MERC. The order authorized a retail natural gas rate increase of $3.1 million (1.26%). The rates reflect a 9.7% ROE and a common equity component average of 50.9%. The final rates were implemented on July 1, 2019. The final approved rate increase was lower than the interim rates collected from customers during 2018 and through June 30, 2019. Therefore, as of June 30, 2019, we estimated that $7.6 million will be refunded to MERC's customers in September 2019.

The final order addressed the various impacts of the Tax Legislation, including the remeasurement of deferred tax balances. All of the impacts from the Tax Legislation have been included in base rates. The order also approved MERC's continued use of its decoupling mechanism for residential customers. Effective January 1, 2019, MERC's small commercial and industrial customers are no longer included in the decoupling mechanism.

Upper Michigan Energy Resources Corporation and Michigan Gas Utilities Corporation

Tax Cuts and Jobs Act of 2017

In February 2018, the MPSC issued an order requiring Michigan utilities to make three filings related to the Tax Legislation. The first of those filings, which was filed in March 2018, prospectively addressed the impact on base rates for the change in tax expense resulting from the federal tax rate reduction from 35% to 21%. UMERC and MGU proposed providing a volumetric bill credit, subject to reconciliation and true up. In May 2018, the MPSC issued orders approving settlements that resulted in volumetric bill credits for all of UMERC's and MGU's customers effective July 1, 2018. The bill credits will remain in effect until each company's next rate proceeding.

The second filing, which was filed in July 2018, addressed the impact on base rates for the change in tax expense resulting from the federal tax rate reduction from 35% to 21% from January 1, 2018 until July 1, 2018. UMERC and MGU proposed to return the tax savings from these months to customers via volumetric bill credits over multiple months. The MPSC issued orders approving settlements in September 2018. In accordance with the settlement orders, the savings were returned to UMERC's and MGU's customers via volumetric bill credits that were in effect from October 1, 2018 through December 31, 2018.

The third filing was filed in October 2018 and addressed the remaining impacts of the Tax Legislation on base rates – most notably the re-measurement of deferred tax balances. UMERC and MGU proposed providing a volumetric bill credit, subject to reconciliation and true up, to return these remaining impacts of the Tax Legislation to customers. The MPSC issued orders approving settlements in May 2019. The settlement orders provide for volumetric bill credits to UMERC’s and MGU’s customers effective June 1, 2019. The bill credits will remain in effect until each company's next rate proceeding.

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NEW ACCOUNTING PRONOUNCEMENTS

6 Months Ended

Jun. 30, 2019

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS

Financial Instruments Credit Losses

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. This ASU introduces a new impairment model known as the current expected credit loss model. The ASU requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. Previously, recognition of the full amount of credit losses was generally delayed until the loss was probable of occurring. We are currently assessing the effects this guidance may have on our financial statements.

Cloud Computing

In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The standard allows entities who are customers in hosting arrangements that are service contracts to apply the existing internal-use software guidance to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The guidance specifies classification for capitalizing implementation costs and related amortization expense within the financial statements and requires additional disclosures. The guidance will be effective for annual reporting periods, including interim reporting within those periods, beginning after December 15, 2019. Early adoption is permitted and can be applied either retrospectively or prospectively. We are currently evaluating the transition methods and the impact the adoption of this standard may have on our financial statements.

Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework: Changes to the Disclosure Requirements for Defined Benefit Plans. The pronouncement modifies the disclosure requirements for defined benefit pension and other postretirement benefit plans. The guidance removes disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures and adds disclosure requirements identified as relevant. The modifications affect annual period disclosures and must be applied on a retrospective basis to all periods presented. The guidance will be effective for annual reporting periods ending after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this pronouncement on our Notes to Consolidated Financial Statements.

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GENERAL INFORMATION (Policies)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Consolidation

As used in these notes, the term "financial statements" refers to the condensed consolidated financial statements. This includes the income statements, statements of comprehensive income, balance sheets, statements of cash flows, and statements of equity, unless otherwise noted. In this report, when we refer to "the Company," "us," "we," "our," or "ours," we are referring to WEC Energy Group and all of its subsidiaries.

On our financial statements, we consolidate our majority-owned subsidiaries and reflect noncontrolling interests for the portion of entities that we do not own as a component of consolidated equity separate from the equity attributable to our shareholders. The noncontrolling interests that we reported as equity on our balance sheet as of June 30, 2019 related to the minority interests at Bishop Hill III, Coyote Ridge, and Upstream held by third parties. We completed the acquisition of an 80% membership interest in Upstream during January 2019.

Basis of accounting

We have prepared the unaudited interim financial statements presented in this Form 10-Q pursuant to the rules and regulations of the SEC and GAAP. Accordingly, these financial statements do not include all of the information and footnotes required by GAAP for annual financial statements. These financial statements should be read in conjunction with the consolidated financial statements and footnotes in our Annual Report on Form 10-K for the year ended December 31, 2018. Financial results for an interim period may not give a true indication of results for the year. In particular, the results of operations for the three and six months ended June 30, 2019, are not necessarily indicative of expected results for 2019 due to seasonal variations and other factors.

In management's opinion, we have included all adjustments, normal and recurring in nature, necessary for a fair presentation of our financial results.

Leases

We are currently party to several easement agreements that allow us access to land we do not own for the purpose of constructing and maintaining certain electric power and natural gas equipment. The majority of payments we make related to easements relate to our wind farms. We have not classified our easements as leases because we view the entire parcel of land specified in our easement agreements to be the identified asset, not just that portion of the parcel that contains our easement. As such, we have concluded that we do not control the use of an identified asset related to our easement agreements, nor do we obtain substantially all of the economic benefits associated with these shared-use assets.Instead, in accordance with Accounting Standards Codification 842-10-15-31, our policy is to account for each lease component separately from the nonlease components of the contract.

Fair value measurement

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price).

Fair value accounting rules provide a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are defined as follows:

Level 1 – Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis.

Level 2 – Pricing inputs are observable, either directly or indirectly, but are not quoted prices included within Level 1. Level 2 includes those financial instruments that are valued using external inputs within models or other valuation methods.

Level 3 – Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methods that result in management's best estimate of fair value. Level 3 instruments include those that may be more structured or otherwise tailored to customers' needs.

Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. We use a mid-market pricing convention (the mid-point between bid and ask prices) as a practical measure for valuing certain derivative assets and liabilities. We primarily use a market approach for recurring fair value measurements and attempt to use valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs.

When possible, we base the valuations of our financial assets and liabilities on quoted prices for identical assets and liabilities in active markets. These valuations are classified in Level 1. The valuations of certain contracts not classified as Level 1 may be based on quoted market prices received from counterparties and/or observable inputs for similar instruments. Transactions valued using these inputs are classified in Level 2. Certain derivatives are categorized in Level 3 due to the significance of unobservable or internally-developed inputs.

We recognize transfers between levels of the fair value hierarchy at their value as of the end of the reporting period.

Derivative instruments

We use derivatives as part of our risk management program to manage the risks associated with the price volatility of interest rates, purchased power, generation, and natural gas costs for the benefit of our customers and shareholders. Our approach is non-speculative and designed to mitigate risk. Regulated hedging programs are approved by our state regulators.

We record derivative instruments on our balance sheets as an asset or liability measured at fair value unless they qualify for the normal purchases and sales exception and are so designated. We continually assess our contracts designated as normal and will discontinue the treatment of these contracts as normal if the required criteria are no longer met. Changes in the derivative's fair value are recognized currently in earnings unless specific hedge accounting criteria are met or we receive regulatory treatment for the derivative. For most energy-related physical and financial contracts in our regulated operations that qualify as derivatives, our regulators allow the effects of fair value accounting to be offset to regulatory assets and liabilities.

New accounting pronouncements

Financial Instruments Credit Losses

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. This ASU introduces a new impairment model known as the current expected credit loss model. The ASU requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. Previously, recognition of the full amount of credit losses was generally delayed until the loss was probable of occurring. We are currently assessing the effects this guidance may have on our financial statements.

Cloud Computing

In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The standard allows entities who are customers in hosting arrangements that are service contracts to apply the existing internal-use software guidance to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The guidance specifies classification for capitalizing implementation costs and related amortization expense within the financial statements and requires additional disclosures. The guidance will be effective for annual reporting periods, including interim reporting within those periods, beginning after December 15, 2019. Early adoption is permitted and can be applied either retrospectively or prospectively. We are currently evaluating the transition methods and the impact the adoption of this standard may have on our financial statements.

Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework: Changes to the Disclosure Requirements for Defined Benefit Plans. The pronouncement modifies the disclosure requirements for defined benefit pension and other postretirement benefit plans. The guidance removes disclosures that are no longer considered cost beneficial, clarifies the specific requirements of disclosures and adds disclosure requirements identified as relevant. The modifications affect annual period disclosures and must be applied on a retrospective basis to all periods presented. The guidance will be effective for annual reporting periods ending after December 15, 2020, with early adoption permitted. We are currently evaluating the effects of this pronouncement on our Notes to Consolidated Financial Statements.

Other non-utility revenues

Disaggregation of Operating Revenues

Revenue Recognition

As part of the construction of the We Power electric generating units, we capitalized interest during construction, which is included in property, plant, and equipment. As allowed by the PSCW, we collected carrying costs from WE's utility customers during construction. The equity portion of these carrying costs was recorded as deferred revenue, net on our balance sheets and we continually amortize this contract liability to revenues over the life of the related lease term that We Power has with WE.

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OPERATING REVENUES (Tables)

6 Months Ended

Jun. 30, 2019

Disaggregation of Operating Revenues

Operating revenues disaggregated by revenue source

The following tables present our operating revenues disaggregated by revenue source. We do not have any revenues associated with our electric transmission segment, which includes investments accounted for using the equity method. We disaggregate revenues into categories that depict how the nature, amount, timing, and uncertainty of revenues and cash flows are affected by economic factors. For our segments, revenues are further disaggregated by electric and natural gas operations and then by customer class. Each customer class within our electric and natural gas operations have different expectations of service, energy and demand requirements, and are impacted by regulatory activities within their jurisdictions.

(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended June 30, 2019
Electric	$	1,021.9	$	—	$	—	$	1,021.9	$	—	$	—	$	—		$	1,021.9
Natural gas	227.3		232.8		64.0		524.1		9.8		—		(9.1		)	524.8
Total regulated revenues	1,249.2		232.8		64.0		1,546.0		9.8		—		(9.1		)	1,546.7
Other non-utility revenues	—		—		4.2		4.2		15.3		0.8		(3.1		)	17.2
Total revenues from contracts with customers	1,249.2		232.8		68.2		1,550.2		25.1		0.8		(12.2		)	1,563.9
Other operating revenues	4.1		10.1		0.6		14.8		98.2		0.1		(86.8		)	26.3
Total operating revenues	$	1,253.3	$	242.9	$	68.8	$	1,565.0	$	123.3	$	0.9	$	(99.0	)	$	1,590.2

(in millions)	Wisconsin		Illinois			Other States			Total Utility Operations			Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended June 30, 2018
Electric	$	1,084.2	$	—		$	—		$	1,084.2		$	—	$	—	$	—		$	1,084.2
Natural gas	236.4		273.8			68.9			579.1			10.0		—		(12.7		)	576.4
Total regulated revenues	1,320.6		273.8			68.9			1,663.3			10.0		—		(12.7		)	1,660.6
Other non-utility revenues	—		0.1			3.9			4.0			9.3		2.8		(3.1		)	13.0
Total revenues from contracts with customers	1,320.6		273.9			72.8			1,667.3			19.3		2.8		(15.8		)	1,673.6
Other operating revenues	4.9		(5.9		)	(0.4		)	(1.4		)	97.7		0.3		(97.7		)	(1.1		)
Total operating revenues	$	1,325.5	$	268.0		$	72.4		$	1,665.9		$	117.0	$	3.1	$	(113.5	)	$	1,672.5

(in millions)	Wisconsin		Illinois		Other States			Total Utility Operations		Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended June 30, 2019
Electric	$	2,083.7	$	—	$	—		$	2,083.7	$	—	$	—	$	—		$	2,083.7
Natural gas	792.2		777.4		249.2			1,818.8		26.2		—		(23.8		)	1,821.2
Total regulated revenues	2,875.9		777.4		249.2			3,902.5		26.2		—		(23.8		)	3,904.9
Other non-utility revenues	—		0.1		8.3			8.4		28.6		2.3		(3.8		)	35.5
Total revenues from contracts with customers	2,875.9		777.5		257.5			3,910.9		54.8		2.3		(27.6		)	3,940.4
Other operating revenues	10.8		1.9		(3.5		)	9.2		196.3		0.3		(178.6		)	27.2
Total operating revenues	$	2,886.7	$	779.4	$	254.0		$	3,920.1	$	251.1	$	2.6	$	(206.2	)	$	3,967.6

(in millions)	Wisconsin		Illinois			Other States			Total Utility Operations			Non-Utility Energy Infrastructure		Corporate and Other		Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended June 30, 2018
Electric	$	2,151.9	$	—		$	—		$	2,151.9		$	—	$	—	$	—		$	2,151.9
Natural gas	754.4		781.4			241.6			1,777.4			24.9		—		(15.2		)	1,787.1
Total regulated revenues	2,906.3		781.4			241.6			3,929.3			24.9		—		(15.2		)	3,939.0
Other non-utility revenues	—		0.1			7.8			7.9			16.4		4.1		(3.8		)	24.6
Total revenues from contracts with customers	2,906.3		781.5			249.4			3,937.2			41.3		4.1		(19.0		)	3,963.6
Other operating revenues	8.3		(6.2		)	(7.1		)	(5.0		)	193.8		0.4		(193.8		)	(4.6		)
Total operating revenues	$	2,914.6	$	775.3		$	242.3		$	3,932.2		$	235.1	$	4.5	$	(212.8	)	$	3,959.0

Revenues from contracts with customers | Electric

Disaggregation of Operating Revenues

Operating revenues disaggregated by revenue source

The following table disaggregates electric utility operating revenues into customer class:

	Electric Utility Operating Revenues
	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Residential	$	356.7	$	393.7	$	763.4	$	778.0
Small commercial and industrial	331.3		353.3		665.2		684.0
Large commercial and industrial	217.8		241.6		430.1		445.5
Other	7.3		7.2		15.1		14.9
Total retail revenues	913.1		995.8		1,873.8		1,922.4
Wholesale	44.6		58.4		92.3		113.3
Resale	49.4		25.1		90.2		98.9
Steam	4.3		4.5		14.4		14.2
Other utility revenues	10.5		0.4		13.0		3.1
Total electric utility operating revenues	$	1,021.9	$	1,084.2	$	2,083.7	$	2,151.9

Revenues from contracts with customers | Natural gas

Disaggregation of Operating Revenues

Operating revenues disaggregated by revenue source

The following tables disaggregate natural gas utility operating revenues into customer class:

(in millions)	Wisconsin		Illinois			Other States			Total Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2019
Residential	$	126.2	$	154.1		$	39.3		$	319.6
Commercial and industrial	55.8		45.1			20.5			121.4
Total retail revenues	182.0		199.2			59.8			441.0
Transport	16.2		46.8			6.3			69.3
Other utility revenues *	29.1		(13.2		)	(2.1		)	13.8
Total natural gas utility operating revenues	$	227.3	$	232.8		$	64.0		$	524.1

(in millions)	Wisconsin		Illinois		Other States		Total Natural Gas Utility Operating Revenues
Three Months Ended June 30, 2018
Residential	$	128.1	$	163.7	$	37.9	$	329.7
Commercial and industrial	63.5		47.3		18.7		129.5
Total retail revenues	191.6		211.0		56.6		459.2
Transport	16.4		54.6		6.8		77.8
Other utility revenues *	28.4		8.2		5.5		42.1
Total natural gas utility operating revenues	$	236.4	$	273.8	$	68.9	$	579.1

(in millions)	Wisconsin			Illinois			Other States			Total Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2019
Residential	$	510.1		$	508.1		$	164.5		$	1,182.7
Commercial and industrial	255.5			161.3			92.5			509.3
Total retail revenues	765.6			669.4			257.0			1,692.0
Transport	38.1			134.0			17.4			189.5
Other utility revenues *	(11.5		)	(26.0		)	(25.2		)	(62.7		)
Total natural gas utility operating revenues	$	792.2		$	777.4		$	249.2		$	1,818.8

(in millions)	Wisconsin			Illinois			Other States			Total Natural Gas Utility Operating Revenues
Six Months Ended June 30, 2018
Residential	$	484.8		$	496.3		$	161.1		$	1,142.2
Commercial and industrial	251.4			156.7			83.4			491.5
Total retail revenues	736.2			653.0			244.5			1,633.7
Transport	37.4			132.3			16.7			186.4
Other utility revenues *	(19.2		)	(3.9		)	(19.6		)	(42.7		)
Total natural gas utility operating revenues	$	754.4		$	781.4		$	241.6		$	1,777.4

* Includes amounts collected from (refunded to) customers for purchased gas adjustment costs.

Revenues from contracts with customers | Other non-utility revenues

Disaggregation of Operating Revenues

Operating revenues disaggregated by revenue source

Other non-utility operating revenues consist primarily of the following:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
We Power revenues	$	6.3	$	6.2	$	12.7	$	12.6
Appliance service revenues	4.2		3.9		8.3		7.8
Distributed renewable solar project revenues	0.8		2.8		2.3		4.1
Wind generation revenues *	5.9		—		12.1		—
Other	—		0.1		0.1		0.1
Total other non-utility operating revenues	$	17.2	$	13.0	$	35.5	$	24.6

* In 2019, we continued to invest in wind generation facilities and recognize revenues from these wind generation facilities as energy is produced and delivered to the customer within the production month.

Other operating revenues

Disaggregation of Operating Revenues

Operating revenues disaggregated by revenue source

Other operating revenues consist primarily of the following:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2019		2018			2019			2018
Alternative revenues *	$	1.1	$	(14.2	)	$	(18.6	)	$	(30.3	)
Late payment charges	12.0		11.1			25.2			22.5
Rental revenues	13.2		2.0			20.6			3.2
Total other operating revenues	$	26.3	$	(1.1	)	$	27.2		$	(4.6	)

*

Negative amounts can result from alternative revenues being reversed to revenues from contracts with customers as the customer is billed for these alternative revenues. Negative amounts can also result from revenues to be refunded to customers subject to decoupling mechanisms and wholesale true-ups.

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REGULATORY ASSETS AND LIABILITIES (Tables)

6 Months Ended

Jun. 30, 2019

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of regulatory assets

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets
Pension and OPEB costs	$	1,153.3	$	1,193.5
Plant retirements *	1,031.7		832.3
Environmental remediation costs	707.6		687.1
Income tax related items	424.6		369.1
SSR	319.0		316.7
Asset retirement obligations	212.2		185.4
Uncollectible expense	43.6		38.7
We Power generation	38.6		43.0
Electric transmission costs	25.6		58.1
Energy efficiency programs	8.9		14.0
Other, net	70.2		117.9
Total regulatory assets	$	4,035.3	$	3,855.8
Balance sheet presentation
Other current assets	$	28.3	$	50.7
Regulatory assets	4,007.0		3,805.1
Total regulatory assets	$	4,035.3	$	3,855.8

*

On March 31, 2019, the PIPP generating units were retired by WE. See Note 6, Property, Plant, and Equipment, for more information on the retirement of the PIPP units.

Schedule of regulatory liabilities

(in millions)	June 30, 2019		December 31, 2018
Regulatory liabilities
Income tax related items	$	2,389.6	$	2,406.6
Removal costs	1,304.7		1,329.6
Pension and OPEB costs	231.2		238.3
Mines deferral	130.5		120.8
Energy costs refundable through rate adjustments	90.1		39.6
Decoupling	48.7		30.5
Energy efficiency programs	42.0		31.7
Uncollectible expense	31.9		30.5
Earnings sharing mechanisms	30.0		30.0
Derivatives	17.5		16.4
Other, net	14.2		14.4
Total regulatory liabilities	$	4,330.4	$	4,288.4
Balance sheet presentation
Other current liabilities	$	86.8	$	36.8
Regulatory liabilities	4,243.6		4,251.6
Total regulatory liabilities	$	4,330.4	$	4,288.4

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PROPERTY, PLANT, AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2019

Restructuring cost and reserve

Schedule of changes to our severance liability

In addition, a severance liability was recorded in other current liabilities on our balance sheets related to these plant retirements.

(in millions)
Severance liability at December 31, 2018	$	15.7
Severance payments	(6.7		)
Other	(3.1		)
Total severance liability at June 30, 2019	$	5.9

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COMMON EQUITY (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Schedule of stock-based compensation awards granted

During the first quarter of 2019, the Compensation Committee of our Board of Directors awarded the following stock-based compensation awards to our directors, officers, and certain other key employees:

Award Type	Number of Awards
Stock options (1)	476,418
Restricted shares (2)	73,571
Performance units	148,036

⁽¹⁾  Stock options awarded had a weighted-average exercise price of $68.18 and a weighted-average grant date fair value of $8.60 per option.

⁽²⁾  Restricted shares awarded had a weighted-average grant date fair value of $68.18 per share.

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SHORT-TERM DEBT AND LINES OF CREDIT (Tables)

6 Months Ended

Jun. 30, 2019

Short-term Debt [Abstract]

Schedule of short-term borrowings and weighted-average interest rates

The following table shows our short-term borrowings and their corresponding weighted-average interest rates:

(in millions, except percentages)	June 30, 2019			December 31, 2018
Commercial paper
Amount outstanding	$	1,262.7		$	1,440.1
Weighted-average interest rate on amounts outstanding	2.58		%	2.92		%

Schedule of revolving credit facilities and remaining available capacity

The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including available capacity under these facilities:

(in millions)	Maturity	June 30, 2019
WEC Energy Group	October 2022	$	1,200.0
WE	October 2022	500.0
WPS	October 2022	400.0
WG	October 2022	350.0
PGL	October 2022	350.0
Total short-term credit capacity		$	2,800.0
Less:
Letters of credit issued inside credit facilities		$	2.5
Commercial paper outstanding		1,262.7
Available capacity under existing agreements		$	1,534.8

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LEASES (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Schedule of lease expense and supplemental cash flow information for leases

The components of lease expense and supplemental cash flow information related to our leases for the three and six months ended June 30 are as follows:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019			2018
Finance/capital lease expense (1)	$	2.1	$	1.9	$	4.1		$	3.8
Operating lease expense (2)	1.4		1.4		2.8			2.8
Short-term lease expense (2)	0.1		0.6		0.1			0.7
Total lease expense	$	3.6	$	3.9	$	7.0		$	7.3
Other information
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows for finance/capital lease (3)					$	1.8		$	3.8
Operating cash flows for operating leases					$	3.2		$	3.3
Financing cash flows for finance lease (3)					$	2.3		$	—
Non-cash activity – right of use assets obtained in exchange for operating lease liabilities					$	49.0
Remaining lease term – finance lease					2.9 years
Weighted-average remaining lease term – operating leases					13.1 years
Discount rate – finance lease (4)					15.8		%
Weighted average discount rate – operating leases (4)					4.4		%

⁽¹⁾  For the three and six months ended June 30, 2019, finance lease expense included amortization of right of use assets in the amount of $1.2 million and $2.3 million (included in depreciation and amortization expense), respectively and interest on lease liabilities of $0.9 million and $1.8 million (included in interest expense), respectively. For each of the three and six months ended June 30, 2018, total finance lease expense related to the long-term power purchase agreement was included in cost of sales.

⁽²⁾  Operating and short-term lease expense were included as a component of operation and maintenance for the three and six months ended June 30, 2019 and 2018.

⁽³⁾  Prior to our adoption of Topic 842 on January 1, 2019, all cash flows related to the finance lease were recorded as a component of operating cash flows.

⁽⁴⁾ 

Because our operating leases do not provide an implicit rate of return, we used the fully collateralized incremental borrowing rates based upon information available for similarly rated companies in determining the present value of lease payments for our operating leases. For our financing lease, the rate implicit in the lease was readily determinable.

Schedule of finance lease right of use asset

The following table summarizes our finance lease right of use asset, which was included in property, plant and equipment on our balance sheets:

(in millions)	June 30, 2019			December 31, 2018
Long-term power purchase commitment	$	140.3		$	140.3
Accumulated amortization	(123.7		)	(120.9		)
Total finance lease right of use asset/capital lease asset	$	16.6		$	19.4

Schedule of future minimum lease payments for operating and finance leases

Future minimum lease payments under our operating leases and our finance lease, and the present value of our net minimum lease payments as of June 30, 2019, were as follows:

(in millions)	Total Operating Leases			Power Purchase Commitment
Six months ending December 31, 2019	$	2.7		$	4.1
2020	6.9			8.8
2021	4.9			9.4
2022	4.9			4.2
2023	5.0			—
2024	4.8			—
Thereafter	30.5			—
Total minimum lease payments	59.7			26.5
Less: Interest	(15.3		)	(5.5		)
Present value of minimum lease payments	44.4			21.0
Less: Short-term lease liabilities	(4.3		)	(5.6		)
Long-term lease liabilities	$	40.1		$	15.4

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MATERIALS, SUPPLIES, AND INVENTORIES (Tables)

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Schedule of inventory

Our inventory consisted of:

(in millions)	June 30, 2019		December 31, 2018
Materials and supplies	$	236.0	$	226.6
Natural gas in storage	130.5		232.9
Fossil fuel	94.9		88.7
Total	$	461.4	$	548.2

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INCOME TAXES (Tables)

6 Months Ended

Jun. 30, 2019

Income Tax Disclosure [Abstract]

Schedule of effective income tax rate reconciliation

The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:

	Three Months Ended June 30, 2019					Three Months Ended June 30, 2018
(in millions)	Amount			Effective Tax Rate		Amount			Effective Tax Rate
Statutory federal income tax	$	52.7		21.0	%	$	59.2		21.0	%
State income taxes net of federal tax benefit	15.6			6.2	%	17.7			6.3	%
Tax repairs	(30.4		)	(12.1	)%	(22.5		)	(8.0	)%
Federal excess deferred tax amortization	(7.5		)	(3.0	)%	1.5			0.5	%
Wind production tax credits	(6.2		)	(2.5	)%	(2.1		)	(0.7	)%
Excess tax benefits – stock options	(4.4		)	(1.7	)%	(1.0		)	(0.3	)%
Other	(4.6		)	(1.8	)%	(1.7		)	(0.7	)%
Total income tax expense	$	15.2		6.1	%	$	51.1		18.1	%

	Six Months Ended June 30, 2019					Six Months Ended June 30, 2018
(in millions)	Amount			Effective Tax Rate		Amount			Effective Tax Rate
Statutory federal income tax	$	154.6		21.0	%	$	159.7		21.0	%
State income taxes net of federal tax benefit	46.5			6.3	%	47.6			6.3	%
Tax repairs	(60.0		)	(8.1	)%	(48.0		)	(6.3	)%
Federal excess deferred tax amortization	(20.7		)	(2.8	)%	(14.0		)	(1.8	)%
Wind production tax credits	(19.6		)	(2.7	)%	(5.9		)	(0.8	)%
Excess tax benefits – stock options	(11.6		)	(1.6	)%	(1.9		)	(0.3	)%
Other	(9.0		)	(1.2	)%	1.9			0.2	%
Total income tax expense	$	80.2		10.9	%	$	139.4		18.3	%

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FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Fair value of assets and liabilities measured on a recurring basis, categorized by level within the fair value hierarchy

The following tables summarize our financial assets and liabilities that were accounted for at fair value on a recurring basis, categorized by level within the fair value hierarchy:

	June 30, 2019
(in millions)	Level 1		Level 2		Level 3		Total
Derivative assets
Natural gas contracts	$	2.6	$	2.0	$	—	$	4.6
FTRs	—		—		10.4		10.4
Coal contracts	—		0.8		—		0.8
Total derivative assets	$	2.6	$	2.8	$	10.4	$	15.8
Investments held in rabbi trust	$	77.1	$	—	$	—	$	77.1
Derivative liabilities
Natural gas contracts	$	23.8	$	0.5	$	—	$	24.3
Coal contracts	—		0.1		—		0.1
Interest rate swaps	—		6.7		—		6.7
Total derivative liabilities	$	23.8	$	7.3	$	—	$	31.1

	December 31, 2018
(in millions)	Level 1		Level 2		Level 3		Total
Derivative assets
Natural gas contracts	$	6.3	$	1.8	$	—	$	8.1
FTRs	—		—		7.4		7.4
Coal contracts	—		0.4		—		0.4
Total derivative assets	$	6.3	$	2.2	$	7.4	$	15.9
Investments held in rabbi trust	$	65.0	$	—	$	—	$	65.0
Derivative liabilities
Natural gas contracts	$	4.7	$	0.8	$	—	$	5.5
Coal contracts	—		0.1		—		0.1
Interest rate swaps	—		2.3		—		2.3
Total derivative liabilities	$	4.7	$	3.2	$	—	$	7.9

Reconciliation of changes in fair value of items categorized as level 3 measurements

The following table summarizes the changes to derivatives classified as Level 3 in the fair value hierarchy:

	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Balance at the beginning of the period	$	3.1		$	1.5		$	7.4		$	4.4
Purchases	12.8			18.4			12.8			18.4
Settlements	(5.5		)	(3.2		)	(9.8		)	(6.1		)
Balance at the end of the period	$	10.4		$	16.7		$	10.4		$	16.7

Schedule of carrying value and estimated fair value of financial instruments not recorded at fair value

The following table shows the financial instruments included on our balance sheets that were not recorded at fair value:

	June 30, 2019				December 31, 2018
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Preferred stock of subsidiary	$	30.4	$	28.2	$	30.4	$	28.3
Long-term debt, including current portion *	10,666.5		11,543.4		10,335.7		10,554.9

*

The carrying amount of long-term debt excludes finance and capital lease obligations of $21.0 million and $23.3 million at June 30, 2019 and December 31, 2018, respectively.

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DERIVATIVE INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative assets and derivative liabilities

The following table shows our derivative assets and derivative liabilities:

	June 30, 2019				December 31, 2018
(in millions)	Derivative Assets		Derivative Liabilities		Derivative Assets		Derivative Liabilities
Other current
Natural gas contracts	$	4.6	$	22.5	$	7.7	$	5.3
FTRs	10.4		—		7.4		—
Coal contracts	0.5		0.1		0.2		0.1
Interest rate swaps	—		1.9		—		0.4
Total other current *	$	15.5	$	24.5	$	15.3	$	5.8
Other long-term
Natural gas contracts	$	—	$	1.8	$	0.4	$	0.2
Coal contracts	0.3		—		0.2		—
Interest rate swaps	—		4.8		—		1.9
Total other long-term *	$	0.3	$	6.6	$	0.6	$	2.1
Total	$	15.8	$	31.1	$	15.9	$	7.9

*

On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.

Estimated notional sales volumes and realized gain (losses)

Our estimated notional sales volumes and realized gains (losses) were as follows:

	Three Months Ended June 30, 2019				Three Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	43.8 Dth	$	(3.1	)	39.9 Dth	$	(2.3	)
Petroleum products contracts	— gallons	—			1.7 gallons	0.3
FTRs	8.0 MWh	3.0			6.8 MWh	3.9
Total		$	(0.1	)		$	1.9

	Six Months Ended June 30, 2019				Six Months Ended June 30, 2018
(in millions)	Volumes	Gains (Losses)			Volumes	Gains (Losses)
Natural gas contracts	99.9 Dth	$	(3.6	)	88.0 Dth	$	(7.5	)
Petroleum products contracts	— gallons	—			3.8 gallons	0.8
FTRs	16.1 MWh	5.3			15.0 MWh	7.6
Total		$	1.7			$	0.9

Offsetting assets and liabilities

The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:

	June 30, 2019							December 31, 2018
(in millions)	Derivative Assets			Derivative Liabilities				Derivative Assets				Derivative Liabilities
Gross amount recognized on the balance sheet	$	15.8		$	31.1			$	15.9			$	7.9
Gross amount not offset on the balance sheet	(3.0		)	(24.2		)	(1)	(4.0		)	(2)	(4.9		)	(3)
Net amount	$	12.8		$	6.9			$	11.9			$	3.0

⁽¹⁾   Includes cash collateral posted of $21.2 million.

⁽²⁾   Includes cash collateral received of $0.2 million.

⁽³⁾   Includes cash collateral posted of $1.1 million.

Amounts related to cash flow hedges recorded in other comprehensive loss and earnings

The table below shows the amounts related to these cash flow hedges recorded in other comprehensive loss and in earnings, along with our total interest expense on the income statements:

	Three Months Ended June 30					Six Months Ended June 30
(in millions)	2019			2018		2019			2018
Derivative losses recognized in other comprehensive loss	$	(3.2	)	$	—	$	(4.8	)	$	—
Net derivative gains reclassified from accumulated other comprehensive loss to interest expense	0.4			0.5		0.8			1.1
Total interest expense line item on the income statements	124.1			108.5		248.5			215.2

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GUARANTEES (Tables)

6 Months Ended

Jun. 30, 2019

Guarantees [Abstract]

Schedule of outstanding guarantees

The following table shows our outstanding guarantees:

			Expiration
(in millions)	Total Amounts Committed at June 30, 2019		Less Than 1 Year		1 to 3 Years		Over 3 Years
Guarantees
Guarantees supporting commodity transactions of subsidiaries (1)	$	6.7	$	6.7	$	—	$	—
Standby letters of credit (2)	101.3		1.0		0.2		100.1
Surety bonds (3)	9.7		9.6		0.1		—
Other guarantees (4)	10.4		—		0.9		9.5
Total guarantees	$	128.1	$	17.3	$	1.2	$	109.6

⁽¹⁾  Includes $2.7 million and $4.0 million to support the business operations of Bluewater and UMERC, respectively.

⁽²⁾  At our request or the request of our subsidiaries, financial institutions have issued standby letters of credit for the benefit of third parties that have extended credit to our subsidiaries. These amounts are not reflected on our balance sheets.

⁽³⁾  Primarily for workers compensation self-insurance programs and obtaining various licenses, permits, and rights-of-way. These amounts are not reflected on our balance sheets.

⁽⁴⁾ 

Consists of $10.4 million related to other indemnifications, for which a liability of $9.5 million related to workers compensation coverage was recorded on our balance sheets.

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EMPLOYEE BENEFITS (Tables)

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Schedule of net benefit costs

The following tables show the components of net periodic pension and OPEB costs for our benefit plans.

	Pension Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	11.8		$	11.8		$	23.1		$	23.8
Interest cost	30.2			28.7			60.8			57.0
Expected return on plan assets	(48.2		)	(48.8		)	(96.9		)	(98.4		)
Loss on plan settlement	1.0			0.3			1.8			0.7
Amortization of prior service cost	0.5			0.6			1.1			1.3
Amortization of net actuarial loss	18.7			23.9			37.7			47.0
Net periodic benefit cost	$	14.0		$	16.5		$	27.6		$	31.4

	OPEB Costs
	Three Months Ended June 30						Six Months Ended June 30
(in millions)	2019			2018			2019			2018
Service cost	$	3.8		$	5.6		$	8.2		$	11.8
Interest cost	6.3			7.4			12.8			14.9
Expected return on plan assets	(13.6		)	(14.8		)	(27.3		)	(29.7		)
Amortization of prior service credit	(3.8		)	(3.9		)	(7.7		)	(7.7		)
Amortization of net actuarial (gain) loss	(2.0		)	0.2			(2.7		)	0.5
Net periodic benefit credit	$	(9.3	)	$	(5.5	)	$	(16.7	)	$	(10.2	)

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GOODWILL (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to our goodwill balances by segment

The table below shows our goodwill balances by segment for the six months ended June 30, 2019. We had no changes to the carrying amount of goodwill during the six months ended June 30, 2019.

(in millions)	Wisconsin		Illinois		Other States		Non-Utility Energy Infrastructure		Total
Goodwill balance *	$	2,104.3	$	758.7	$	183.2	$	6.6	$	3,052.8

*

We had no accumulated impairment losses related to our goodwill as of June 30, 2019.

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INVESTMENT IN TRANSMISSION AFFILIATES (Tables)

6 Months Ended

Jun. 30, 2019

Investment in transmission affiliates

Schedule of changes to our investments in transmission affiliates

The following tables provide a reconciliation of the changes in our investments in ATC and ATC Holdco:

	Three Months Ended June 30, 2019
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,630.6	$	40.0		$	1,670.6
Add: Earnings (loss) from equity method investment	37.4		(0.5		)	36.9
Add: Capital contributions	18.1		0.4			18.5
Less: Distributions	29.4		—			29.4
Less: Other	0.1		—			0.1
Balance at end of period	$	1,656.6	$	39.9		$	1,696.5

	Three Months Ended June 30, 2018
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,561.1	$	37.8		$	1,598.9
Add: Earnings (loss) from equity method investment	29.8		(1.1		)	28.7
Add: Capital contributions	18.1		1.5			19.6
Less: Distributions	50.7		—			50.7
Add: Other	0.1		—			0.1
Balance at end of period	$	1,558.4	$	38.2		$	1,596.6

	Six Months Ended June 30, 2019
(in millions)	ATC		ATC Holdco			Total
Balance at beginning of period	$	1,625.3	$	40.0		$	1,665.3
Add: Earnings (loss) from equity method investment	73.9		(0.9		)	73.0
Add: Capital contributions	21.1		0.8			21.9
Less: Distributions	63.6		—			63.6
Less: Other	0.1		—			0.1
Balance at end of period	$	1,656.6	$	39.9		$	1,696.5

	Six Months Ended June 30, 2018
(in millions)	ATC			ATC Holdco			Total
Balance at beginning of period	$	1,515.8	(1)	$	37.6		$	1,553.4
Add: Earnings (loss) from equity method investment	63.2			(1.7		)	61.5
Add: Capital contributions	30.1			2.3			32.4
Less: Distributions	50.7		(2)	—			50.7
Balance at end of period	$	1,558.4		$	38.2		$	1,596.6

⁽¹⁾  Distributions of $39.9 million, received in the first quarter of 2018, were approved and recorded as a receivable from ATC in other current assets at December 31, 2017.

⁽²⁾ 

Distributions of $24.2 million, received in the third quarter of 2018, were approved and recorded as a receivable from ATC in accounts receivable at June 30, 2018.

ATC

Investment in transmission affiliates

Schedule of significant transactions with ATC

The following table summarizes our significant related party transactions with ATC:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Charges to ATC for services and construction	$	3.3	$	4.1	$	7.3	$	8.7
Charges from ATC for network transmission services	87.0		84.6		174.1		169.1
Refund from ATC related to a FERC audit	—		22.0		—		22.0

Schedule of receivables and payables with ATC

Our balance sheets included the following receivables and payables for services received from or provided to ATC:

(in millions)	June 30, 2019		December 31, 2018
Accounts receivable for services provided to ATC	$	2.3	$	3.4
Accounts payable for services received from ATC	29.0		28.2
Amounts due from ATC for transmission infrastructure upgrades*	—		29.4

*

In connection with UMERC's construction of the new natural gas-fired generation in the Upper Peninsula of Michigan, UMERC was required to initially fund the construction of the transmission infrastructure upgrades owned by ATC that are needed for the new generation. In the second quarter of 2019, ATC fully reimbursed UMERC for these costs.

Schedule of summarized income statement data for ATC

Summarized financial data for ATC is included in the following tables:

	Three Months Ended June 30				Six Months Ended June 30
(in millions)	2019		2018		2019		2018
Income statement data
Operating revenues	$	182.2	$	165.5	$	359.9	$	330.9
Operating expenses	93.6		91.5		184.0		176.4
Other expense, net	28.6		25.4		57.4		53.0
Net income	$	60.0	$	48.6	$	118.5	$	101.5

Schedule of summarized balance sheet data for ATC

(in millions)	June 30, 2019		December 31, 2018
Balance sheet data
Current assets	$	88.8	$	87.2
Noncurrent assets	5,100.7		4,928.8
Total assets	$	5,189.5	$	5,016.0
Current liabilities	$	562.1	$	640.0
Long-term debt	2,213.0		2,014.0
Other noncurrent liabilities	294.4		295.3
Shareholders' equity	2,120.0		2,066.7
Total liabilities and shareholders' equity	$	5,189.5	$	5,016.0

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SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

Financial information of reportable segments

The following tables show summarized financial information related to our reportable segments for the three and six months ended June 30, 2019 and 2018:

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
June 30, 2019
External revenues	$	1,253.3	$	242.9	$	68.8	$	1,565.0	$	—	$	24.3	$	0.9		$	—		$	1,590.2
Intersegment revenues	—		—		—		—		—		99.0		—			(99.0		)	—
Other operation and maintenance	363.9		107.0		23.4		494.3		—		6.8		1.8			0.7			503.6
Depreciation and amortization	152.9		45.0		6.7		204.6		—		22.9		6.0			(3.6		)	229.9
Operating income (loss)	270.2		42.6		4.6		317.4		—		91.3		(7.1		)	(87.0		)	314.6
Equity in earnings of transmission affiliates	—		—		—		—		36.9		—		—			—			36.9
Interest expense	142.7		13.9		1.9		158.5		2.7		15.5		36.5			(89.1		)	124.1

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
June 30, 2018
External revenues	$	1,325.5	$	268.0	$	72.4	$	1,665.9	$	—	$	3.5	$	3.1		$	—		$	1,672.5
Intersegment revenues	—		—		—		—		—		113.5		—			(113.5		)	—
Other operation and maintenance	502.4		104.1		24.9		631.4		—		4.5		2.2			(100.4		)	537.7
Depreciation and amortization	134.6		41.8		4.5		180.9		—		18.3		7.5			—			206.7
Operating income (loss)	195.1		41.7		8.1		244.9		—		92.4		(6.5		)	—			330.8
Equity in earnings of transmission affiliates	—		—		—		—		28.7		—		—			—			28.7
Interest expense	48.5		12.3		2.1		62.9		—		16.0		30.3			(0.7		)	108.5

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended
June 30, 2019
External revenues	$	2,886.7	$	779.4	$	254.0	$	3,920.1	$	—	$	44.9	$	2.6		$	—		$	3,967.6
Intersegment revenues	—		—		—		—		—		206.2		—			(206.2		)	—
Other operation and maintenance	756.6		235.2		51.0		1,042.8		—		10.6		0.8			—			1,054.2
Depreciation and amortization	303.9		89.5		13.2		406.6		—		45.5		12.4			(8.2		)	456.3
Operating income (loss)	632.0		180.5		46.1		858.6		—		184.0		(11.0		)	(174.2		)	857.4
Equity in earnings of transmission affiliates	—		—		—		—		73.0		—		—			—			73.0
Interest expense	286.1		28.7		4.2		319.0		5.3		31.2		71.6			(178.6		)	248.5

	Utility Operations
(in millions)	Wisconsin		Illinois		Other States		Total Utility Operations		Electric Transmission		Non-Utility Energy Infrastructure		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Six Months Ended
June 30, 2018
External revenues	$	2,914.6	$	775.3	$	242.3	$	3,932.2	$	—	$	22.3	$	4.5		$	—		$	3,959.0
Intersegment revenues	—		—		—		—		—		212.8		—			(212.8		)	—
Other operation and maintenance	970.9		216.3		51.5		1,238.7		—		6.2		1.9			(197.2		)	1,049.6
Depreciation and amortization	269.7		82.7		11.1		363.5		—		36.6		15.2			—			415.3
Operating income (loss)	468.8		189.3		44.3		702.4		—		185.4		(11.9		)	—			875.9
Equity in earnings of transmission affiliates	—		—		—		—		61.5		—		—			—			61.5
Interest expense	97.9		24.6		4.2		126.7		—		32.1		58.3			(1.9		)	215.2

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COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 2019

Commitments and Contingencies Disclosure [Abstract]

Schedule of regulatory assets and reserves related to manufactured gas plant sites

We have established the following regulatory assets and reserves related to manufactured gas plant sites:

(in millions)	June 30, 2019		December 31, 2018
Regulatory assets	$	707.6	$	687.1
Reserves for future remediation	631.8		616.4

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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

6 Months Ended

Jun. 30, 2019

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

Schedule of supplemental cash flow information

	Six Months Ended June 30
(in millions)	2019			2018
Cash (paid) for interest, net of amount capitalized	$	(247.9	)	$	(215.6	)
Cash (paid) for income taxes, net	(15.1		)	(47.6		)
Significant non-cash investing and financing transactions:
Accounts payable related to construction costs	137.3			77.4
Non-cash capital contributions from noncontrolling interest	10.2			—

Reconciliation of cash and cash equivalents and restricted cash

The following table reconciles the cash, cash equivalents, and restricted cash amounts reported within the balance sheets at June 30 to the total of these amounts shown on the statements of cash flows:

(in millions)	2019		2018
Cash and cash equivalents	$	37.9	$	29.8
Restricted cash included in other long term assets	52.8		22.2
Cash, cash equivalents, and restricted cash	$	90.7	$	52.0

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GENERAL INFORMATION - GENERAL (Details) customer in Millions	Jun. 30, 2019 customer
Electric
Product information [Line Items]
Number Of Customers	1.6
Natural gas
Product information [Line Items]
Number Of Customers	2.9

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GENERAL INFORMATION - INVESTMENTS (Details)	Jun. 30, 2019
ATC
Schedule of Investments [Line Items]
Equity method investment, ownership interest (as a percent)	60.00%
Upstream
Schedule of Investments [Line Items]
WEC's ownership interest in Upstream Wind Energy Center	80.00%

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ACQUISITIONS - UPSTREAM ACQUISITION (Details) - Upstream $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) MW
Business Acquisition [Line Items]
WEC's ownership interest in Upstream Wind Energy Center	80.00%
Capacity of Upstream Wind Energy Center | MW	202.5
Acquisition purchase price	$ 268.2
Cash and restricted cash acquired	$ 9.2
Number of years Upstream will receive fixed payment	10 years
Bonus depreciation percentage	100.00%

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ACQUISITIONS - COYOTE RIDGE (Details) - Coyote Ridge Wind $ in Millions	1 Months Ended	6 Months Ended
	Dec. 31, 2018 USD ($) MW	Jun. 30, 2019 USD ($) Years
Business Acquisition [Line Items]
WEC's ownership interest in Coyote Ridge Wind, LLC	80.00%
Capacity of Coyote Ridge | MW	97.5
Acquisition purchase price	$ 61.6
Total expected investment		$ 145.0
Duration of offtake agreement for the sale of energy produced	12 years
Bonus depreciation percentage		100.00%
Percent of tax benefits entitled to		99.00%
Years Entitled to 99 Percent of Tax Benefits | Years		11

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ACQUISITIONS - BISHOP HILL III (Details) - Bishop Hill III Wind Energy Center $ in Millions	1 Months Ended
	Aug. 31, 2018 USD ($) MW	Jun. 30, 2019	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
WEC's ownership interest in Bishop Hill III Wind Energy Center		80.00%
Capacity of Bishop Hill III Wind Energy Center | MW	132
Acquisition purchase price	$ 144.7		$ 18.2
Restricted cash acquired	$ 4.5
Additional Ownership Interest in Bishop Hill III Wind Energy Center			10.00%
Duration of offtake agreement for the sale of energy produced	22 years
Bonus depreciation percentage		100.00%

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ACQUISITIONS - FORWARD WIND ENERGY CENTER (Details) - Forward Wind Energy Center Acquisition $ in Millions	1 Months Ended	6 Months Ended
	Apr. 30, 2018 wind_turbines utility MW	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Number of utilities along with WPS that entered in an agreement to purchase Forward Wind Energy Center | utility	2
Number of wind turbines at Forward Wind Energy Center | wind_turbines	86
Capacity of Foward Wind Energy Center | MW	138
Purchase price | $		$ 172.9
WPS
Business Acquisition [Line Items]
Number of utilities along with WPS that entered in an agreement to purchase Forward Wind Energy Center | utility	2
Purchase price | $		$ 77.1
WPS's share of Forward Wind Energy Center's purchase price	44.60%
Percentage of Forward Wind Energy Center's output purchased by WPS	44.60%

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DISPOSITIONS - PDL (Details) $ in Millions	3 Months Ended
	Jun. 30, 2019 USD ($) solar_projects
Discontinued Operations and Disposal Groups [Abstract]
Number of PDL Solar Power Facilities Sold | solar_projects	3
Proceeds from sale	$ 20.0
Gain on sale	$ 4.9

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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Operating Revenues
Operating revenues	$ 1,590.2	$ 1,672.5	$ 3,967.6	$ 3,959.0
Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,563.9	1,673.6	3,940.4	3,963.6
Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	26.3	(1.1)	27.2	(4.6)
Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,546.7	1,660.6	3,904.9	3,939.0
Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,021.9	1,084.2	2,083.7	2,151.9
Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	524.8	576.4	1,821.2	1,787.1
Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	524.1	579.1	1,818.8	1,777.4
Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	17.2	13.0	35.5	24.6
Total Utility Operations
Disaggregation of Operating Revenues
Operating revenues	1,565.0	1,665.9	3,920.1	3,932.2
Total Utility Operations | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	14.8	(1.4)	9.2	(5.0)
Total Utility Operations | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,550.2	1,667.3	3,910.9	3,937.2
Total Utility Operations | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,546.0	1,663.3	3,902.5	3,929.3
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,021.9	1,084.2	2,083.7	2,151.9
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	524.1	579.1	1,818.8	1,777.4
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.2	4.0	8.4	7.9
Wisconsin
Disaggregation of Operating Revenues
Operating revenues	1,253.3	1,325.5	2,886.7	2,914.6
Wisconsin | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	4.1	4.9	10.8	8.3
Wisconsin | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,249.2	1,320.6	2,875.9	2,906.3
Wisconsin | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,249.2	1,320.6	2,875.9	2,906.3
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,021.9	1,084.2	2,083.7	2,151.9
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	227.3	236.4	792.2	754.4
Wisconsin | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Illinois
Disaggregation of Operating Revenues
Operating revenues	242.9	268.0	779.4	775.3
Illinois | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	10.1	(5.9)	1.9	(6.2)
Illinois | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	232.8	273.9	777.5	781.5
Illinois | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	232.8	273.8	777.4	781.4
Illinois | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	232.8	273.8	777.4	781.4
Illinois | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.1	0.1	0.1
Other States
Disaggregation of Operating Revenues
Operating revenues	68.8	72.4	254.0	242.3
Other States | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	0.6	(0.4)	(3.5)	(7.1)
Other States | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	68.2	72.8	257.5	249.4
Other States | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	64.0	68.9	249.2	241.6
Other States | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Other States | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	64.0	68.9	249.2	241.6
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.2	3.9	8.3	7.8
Non-Utility Energy Infrastructure
Disaggregation of Operating Revenues
Operating revenues	123.3	117.0	251.1	235.1
Non-Utility Energy Infrastructure | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	25.1	19.3	54.8	41.3
Non-Utility Energy Infrastructure | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	98.2	97.7	196.3	193.8
Non-Utility Energy Infrastructure | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	9.8	10.0	26.2	24.9
Non-Utility Energy Infrastructure | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	9.8	10.0	26.2	24.9
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	15.3	9.3	28.6	16.4
Corporate and Other
Disaggregation of Operating Revenues
Operating revenues	0.9	3.1	2.6	4.5
Corporate and Other | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.8	2.8	2.3	4.1
Corporate and Other | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	0.1	0.3	0.3	0.4
Corporate and Other | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Corporate and Other | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Corporate and Other | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Corporate and Other | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.8	2.8	2.3	4.1
Reconciling Eliminations
Disaggregation of Operating Revenues
Operating revenues	(99.0)	(113.5)	(206.2)	(212.8)
Reconciling Eliminations | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	(12.2)	(15.8)	(27.6)	(19.0)
Reconciling Eliminations | Other operating revenues
Disaggregation of Operating Revenues
Other operating revenues	(86.8)	(97.7)	(178.6)	(193.8)
Reconciling Eliminations | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	(9.1)	(12.7)	(23.8)	(15.2)
Reconciling Eliminations | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.0	0.0	0.0
Reconciling Eliminations | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	(9.1)	(12.7)	(23.8)	(15.2)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ (3.1)	$ (3.1)	$ (3.8)	$ (3.8)

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OPERATING REVENUES - DISAGGREGATION OF ELECTRIC UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - Revenues from contracts with customers - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 1,563.9	$ 1,673.6	$ 3,940.4	$ 3,963.6
Electric
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,021.9	1,084.2	2,083.7	2,151.9
Wisconsin | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,249.2	1,320.6	2,875.9	2,906.3
Wisconsin | Electric | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,021.9	1,084.2	2,083.7	2,151.9
Wisconsin | Electric | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	913.1	995.8	1,873.8	1,922.4
Wisconsin | Electric | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	356.7	393.7	763.4	778.0
Wisconsin | Electric | Transferred over time | Small commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	331.3	353.3	665.2	684.0
Wisconsin | Electric | Transferred over time | Large commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	217.8	241.6	430.1	445.5
Wisconsin | Electric | Transferred over time | Other
Disaggregation of Operating Revenues
Revenues from contracts with customers	7.3	7.2	15.1	14.9
Wisconsin | Electric | Transferred over time | Wholesale
Disaggregation of Operating Revenues
Revenues from contracts with customers	44.6	58.4	92.3	113.3
Wisconsin | Electric | Transferred over time | Resale
Disaggregation of Operating Revenues
Revenues from contracts with customers	49.4	25.1	90.2	98.9
Wisconsin | Electric | Transferred over time | Steam
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.3	4.5	14.4	14.2
Wisconsin | Electric | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 10.5	$ 0.4	$ 13.0	$ 3.1

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OPERATING REVENUES - DISAGGREGATION OF NATURAL GAS UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - Revenues from contracts with customers - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 1,563.9	$ 1,673.6	$ 3,940.4	$ 3,963.6
Natural gas
Disaggregation of Operating Revenues
Revenues from contracts with customers	524.8	576.4	1,821.2	1,787.1
Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	524.1	579.1	1,818.8	1,777.4
Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	441.0	459.2	1,692.0	1,633.7
Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	319.6	329.7	1,182.7	1,142.2
Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	121.4	129.5	509.3	491.5
Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	69.3	77.8	189.5	186.4
Total Utility Operations | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,550.2	1,667.3	3,910.9	3,937.2
Total Utility Operations | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	524.1	579.1	1,818.8	1,777.4
Total Utility Operations | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	13.8	42.1	(62.7)	(42.7)
Wisconsin | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,249.2	1,320.6	2,875.9	2,906.3
Wisconsin | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	227.3	236.4	792.2	754.4
Wisconsin | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	182.0	191.6	765.6	736.2
Wisconsin | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	126.2	128.1	510.1	484.8
Wisconsin | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	55.8	63.5	255.5	251.4
Wisconsin | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	16.2	16.4	38.1	37.4
Wisconsin | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	29.1	28.4	(11.5)	(19.2)
Illinois | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	232.8	273.9	777.5	781.5
Illinois | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	232.8	273.8	777.4	781.4
Illinois | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	199.2	211.0	669.4	653.0
Illinois | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	154.1	163.7	508.1	496.3
Illinois | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	45.1	47.3	161.3	156.7
Illinois | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	46.8	54.6	134.0	132.3
Illinois | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	(13.2)	8.2	(26.0)	(3.9)
Other States | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	68.2	72.8	257.5	249.4
Other States | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	64.0	68.9	249.2	241.6
Other States | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	59.8	56.6	257.0	244.5
Other States | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	39.3	37.9	164.5	161.1
Other States | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	20.5	18.7	92.5	83.4
Other States | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	6.3	6.8	17.4	16.7
Other States | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ (2.1)	$ 5.5	$ (25.2)	$ (19.6)

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OPERATING REVENUES - OTHER NON-UTILITY OPERATING REVENUES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
We Power revenues
Disaggregation of Operating Revenues
Revenues amortized from deferred revenue during the period	$ 6.3	$ 6.2	$ 12.7	$ 12.6
Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,563.9	1,673.6	3,940.4	3,963.6
Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	17.2	13.0	35.5	24.6
Other non-utility revenues | Revenues from contracts with customers | We Power revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	6.3	6.2	12.7	12.6
Other non-utility revenues | Revenues from contracts with customers | Distributed renewable solar project revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.8	2.8	2.3	4.1
Other non-utility revenues | Revenues from contracts with customers | Wind generation revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	5.9	0.0	12.1	0.0
Other non-utility revenues | Revenues from contracts with customers | Other
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.1	0.1	0.1
Transferred over time | Other non-utility revenues | Revenues from contracts with customers | Appliance service repairs
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 4.2	$ 3.9	$ 8.3	$ 7.8

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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Operating Revenues
Other operating revenues	$ 26.3	$ (1.1)	$ 27.2	$ (4.6)
Alternative revenues
Disaggregation of Operating Revenues
Other operating revenues	1.1	(14.2)	(18.6)	(30.3)
Late payment charges
Disaggregation of Operating Revenues
Other operating revenues	12.0	11.1	25.2	22.5
Rental revenues
Disaggregation of Operating Revenues
Other operating revenues	$ 13.2	$ 2.0	$ 20.6	$ 3.2

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REGULATORY ASSETS AND LIABILITIES - REGULATORY ASSETS (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Regulatory assets
Current assets	$ 28.3	$ 50.7
Regulatory assets	4,007.0	3,805.1
Total regulatory assets	4,035.3	3,855.8
Pension and OPEB costs
Regulatory assets
Total regulatory assets	1,153.3	1,193.5
Plant retirements
Regulatory assets
Total regulatory assets	1,031.7	832.3
Environmental remediation costs
Regulatory assets
Total regulatory assets	707.6	687.1
Income tax related items
Regulatory assets
Total regulatory assets	424.6	369.1
System support resource
Regulatory assets
Total regulatory assets	319.0	316.7
Asset retirement obligations
Regulatory assets
Total regulatory assets	212.2	185.4
Uncollectible expense
Regulatory assets
Total regulatory assets	43.6	38.7
We Power generation
Regulatory assets
Total regulatory assets	38.6	43.0
Electric transmission costs
Regulatory assets
Total regulatory assets	25.6	58.1
Energy efficiency programs
Regulatory assets
Total regulatory assets	8.9	14.0
Other, net
Regulatory assets
Total regulatory assets	$ 70.2	$ 117.9

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REGULATORY ASSETS AND LIABILITIES - REGULATORY LIABILITIES (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Regulatory liabilities
Current liabilities	$ 86.8	$ 36.8
Regulatory liabilities	4,243.6	4,251.6
Total regulatory liabilities	4,330.4	4,288.4
Income tax related items
Regulatory liabilities
Total regulatory liabilities	2,389.6	2,406.6
Removal costs
Regulatory liabilities
Total regulatory liabilities	1,304.7	1,329.6
Pension and OPEB costs
Regulatory liabilities
Total regulatory liabilities	231.2	238.3
Mines deferral
Regulatory liabilities
Total regulatory liabilities	130.5	120.8
Energy costs refundable through rate adjustments
Regulatory liabilities
Total regulatory liabilities	90.1	39.6
Decoupling
Regulatory liabilities
Total regulatory liabilities	48.7	30.5
Energy efficiency programs
Regulatory liabilities
Total regulatory liabilities	42.0	31.7
Uncollectible expense
Regulatory liabilities
Total regulatory liabilities	31.9	30.5
Earnings sharing mechanisms
Regulatory liabilities
Total regulatory liabilities	30.0	30.0
Derivatives
Regulatory liabilities
Total regulatory liabilities	17.5	16.4
Other, net
Regulatory liabilities
Total regulatory liabilities	$ 14.2	$ 14.4

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PROPERTY, PLANT, AND EQUIPMENT (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Property, plant, and equipment
Net book value of plant classified as a regulatory asset	$ 4,035.3	$ 3,855.8
Cost of removal reserve classified as a regulatory liability	4,330.4	$ 4,288.4
Presque Isle power plant
Property, plant, and equipment
Plant to be retired, at carrying value	167.2
Net book value of plant classified as a regulatory asset	178.5
Cost of removal reserve classified as a regulatory liability	11.3
Wisconsin
Changes to severance liability
Severance liability, balance at beginning of period	15.7
Severance payments	(6.7)
Other	(3.1)
Severance liability, balance at end of period	$ 5.9

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COMMON EQUITY - STOCK-BASED COMPENSATION AWARDS GRANTED (Details)	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Stock options
Stock-based compensation
Stock options granted | shares	476,418
Stock options granted, weighted average exercise price | $ / shares	$ 68.18
Stock options granted, weighted-average grant date fair value | $ / shares	$ 8.60
Restricted shares
Stock-based compensation
Awards granted | shares	73,571
Restricted shares granted, weighted-average grant date fair value | $ / shares	$ 68.18
Performance units
Stock-based compensation
Awards granted | shares	148,036

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COMMON EQUITY - COMMON STOCK DIVIDENDS (Details) - $ / shares	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Dividends payable
Quarterly cash dividend declared (in dollars per share)		$ 0.59	$ 0.5525
Subsequent event
Dividends payable
Quarterly cash dividend declared (in dollars per share)	$ 0.59

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SHORT-TERM DEBT AND LINES OF CREDIT - SHORT-TERM BORROWINGS (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Short-term borrowings
Commercial paper outstanding	$ 1,262.7	$ 1,440.1
Commercial paper
Short-term borrowings
Commercial paper outstanding	$ 1,262.7	$ 1,440.1
Weighted-average interest rate on amounts outstanding	2.58%	2.92%
Average amount outstanding during the period	$ 1,267.3
Weighted-average interest rate during the period	2.76%

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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Revolving credit facilities
Short-term credit capacity	$ 2,800.0
Letters of credit issued inside credit facilities	2.5
Commercial paper outstanding	1,262.7	$ 1,440.1
Available capacity under existing agreements	1,534.8
WEC Energy Group | Credit facility maturing during October 2022
Revolving credit facilities
Short-term credit capacity	1,200.0
WE | Credit facility maturing during October 2022
Revolving credit facilities
Short-term credit capacity	500.0
WPS | Credit facility maturing during October 2022
Revolving credit facilities
Short-term credit capacity	400.0
WG | Credit facility maturing during October 2022
Revolving credit facilities
Short-term credit capacity	350.0
PGL | Credit facility maturing during October 2022
Revolving credit facilities
Short-term credit capacity	$ 350.0

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LONG-TERM DEBT (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jul. 24, 2019
WEC Energy Group | WEC Senior Notes due 2022
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 350.0
Debt instrument stated interest rate percentage	3.10%
Subsequent event | ATC Holding LLC | ATC Holding Senior Notes due September 2029
Debt Instrument [Line Items]
Debt instrument stated interest rate percentage		3.75%
Secured commitment		$ 235.0

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LEASES - ADOPTION OF ASU 2016-02 (Details) $ in Millions	1 Months Ended
	Jan. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($) land_easement
Leases [Abstract]
Impairment losses recorded upon adoption of ASU 2016-02	$ 0.0
Number of land easements treated as leases upon adoption of ASU 2016-02 | land_easement			0
Operating lease right of use assets		$ 44.7	$ 49.0
Operating lease liabilities		$ 44.4	$ 48.8
Finance lease expense impact of adoption of ASU 2016-02	$ 0.0

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LEASES - OBLIGATIONS UNDER FINANCE LEASE (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) MW	Dec. 31, 2009 USD ($)
Leases [Abstract]
Power purchase contract period	25 years
Firm capacity from power purchase contract (in megawatts) | MW	236
Minimum energy requirements over remaining term of power purchase contract (in megawatts) | MW	0
Power purchase contract renewal period	10 years
Maximum regulatory asset for power purchase contract		$ 78.5
Regulatory asset at end of life of power purchase contract	$ 0.0
Finance lease obligation	21.0
Finance lease obligation at end of life of power purchase contract	$ 0.0

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LEASES - LEASE EXPENSE AND SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Lease expense
Operating lease expense	$ 1.4	$ 1.4	$ 2.8	$ 2.8
Short-term lease expense	0.1	0.6	0.1	0.7
Lease expense	3.6	3.9	7.0	7.3
Amortization of finance lease right of use assets	1.2		2.3
Interest on finance lease liabilities	$ 0.9		1.8
Other information
Operating cash flows from finance/capital lease			1.8	3.8
Operating cash flows from operating leases			3.2	3.3
Financing cash flows from finance lease			2.3	0.0
Noncash activity - right of use assets obtained in exchange for new operating lease liabilities			$ 49.0
Remaining lease term - finance lease	2 years 10 months 24 days		2 years 10 months 24 days
Weighted average remaining lease term - operating leases	13 years 1 month 6 days		13 years 1 month 6 days
Discount rate - finance lease	15.80%		15.80%
Weighted average discount rate - operating leases	4.40%		4.40%
Finance and capital leases
Lease expense
Lease expense	$ 2.1	$ 1.9	$ 4.1	$ 3.8

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LEASES - RIGHT OF USE ASSETS (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease right of use assets	$ 44.7	$ 49.0
Finance lease
Lessee, Lease, Description [Line Items]
Long-term power purchase commitment	140.3		$ 140.3
Accumulated amortization	(123.7)		(120.9)
Total finance lease right of use asset/capital lease asset	$ 16.6		$ 19.4

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LEASES - FUTURE MINIMUM LEASE PAYMENTS (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Total operating leases
Six months ended December 31, 2019	$ 2.7
2020	6.9
2021	4.9
2022	4.9
2023	5.0
2024	4.8
Thereafter	30.5
Total minimum lease payments	59.7
Less: interest	(15.3)
Present value of minimum lease payments	44.4	$ 48.8
Less: short-term lease liabilities	(4.3)
Long-term lease liabilities	40.1
Power purchase commitment
Six months ended December 31, 2019	4.1
2020	8.8
2021	9.4
2022	4.2
2023	0.0
2024	0.0
Thereafter	0.0
Total minimum lease payments	26.5
Less: interest	(5.5)
Present value of minimum lease payments	21.0
Less: short-term lease liabilities	(5.6)
Long-term lease liabilities	$ 15.4
Capital lease
Short-term liabilities under capital lease			$ 4.9
Long-term liabilities under capital lease			$ 18.4

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LEASES - SUBSEQUENT EVENTS (Details) - Subsequent event	Jul. 01, 2019 a extension
Lessee, Lease, Description [Line Items]
Solar land lease acreage | a	600
Lease initial term	30 years
Number of contract extensions | extension	2
Renewal term	10 years

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MATERIALS, SUPPLIES, AND INVENTORIES (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Energy Related Inventory
Materials and supplies	$ 236.0	$ 226.6
Natural gas in storage	130.5	232.9
Fossil fuel	94.9	88.7
Total	461.4	$ 548.2
LIFO Method Related Items
LIFO liquidation debit	$ 2.9

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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Effective Income Tax Rate Reconciliation, Amount
Statutory federal income tax, amount	$ 52.7	$ 59.2	$ 154.6	$ 159.7
State income taxes net of federal tax benefit, amount	15.6	17.7	46.5	47.6
Tax repairs, amount	(30.4)	(22.5)	(60.0)	(48.0)
Federal excess deferred tax amortization, amount	(7.5)	1.5	(20.7)	(14.0)
Wind production tax credit, amount	(6.2)	(2.1)	(19.6)	(5.9)
Excess tax benefits-stock options, amount	(4.4)	(1.0)	(11.6)	(1.9)
Other, amount	(4.6)	(1.7)	(9.0)	1.9
Total income tax expense, amount	$ 15.2	$ 51.1	$ 80.2	$ 139.4
Effective Income Tax Rate Reconciliation, Percent
Statutory federal income tax, percentage	21.00%	21.00%	21.00%	21.00%
State income taxes net of federal tax benefit, percentage	6.20%	6.30%	6.30%	6.30%
Tax repairs, percentage	(12.10%)	(8.00%)	(8.10%)	(6.30%)
Federal excess deferred tax amortization, percentage	(3.00%)	0.50%	(2.80%)	(1.80%)
Wind production tax credits, percent	(2.50%)	(0.70%)	(2.70%)	(0.80%)
Excess tax benefits-stock options, percent	(1.70%)	(0.30%)	(1.60%)	(0.30%)
Other, percentage	(1.80%)	(0.70%)	(1.20%)	0.20%
Total income tax expense, percentage	6.10%	18.10%	10.90%	18.30%

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FAIR VALUE MEASUREMENTS - ASSETS AND LIABILITIES MEASURED ON A RECURRING BASIS (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets
Derivative asset	$ 15.8	$ 15.9
Liabilities
Derivative liability	31.1	7.9
Fair value measurements on a recurring basis
Assets
Derivative asset	15.8	15.9
Investments held in rabbi trust	77.1	65.0
Liabilities
Derivative liability	31.1	7.9
Fair value measurements on a recurring basis | Level 1
Assets
Derivative asset	2.6	6.3
Investments held in rabbi trust	77.1	65.0
Liabilities
Derivative liability	23.8	4.7
Fair value measurements on a recurring basis | Level 2
Assets
Derivative asset	2.8	2.2
Investments held in rabbi trust	0.0	0.0
Liabilities
Derivative liability	7.3	3.2
Fair value measurements on a recurring basis | Level 3
Assets
Derivative asset	10.4	7.4
Investments held in rabbi trust	0.0	0.0
Liabilities
Derivative liability	0.0	0.0
Fair value measurements on a recurring basis | Natural gas contracts
Assets
Derivative asset	4.6	8.1
Liabilities
Derivative liability	24.3	5.5
Fair value measurements on a recurring basis | Natural gas contracts | Level 1
Assets
Derivative asset	2.6	6.3
Liabilities
Derivative liability	23.8	4.7
Fair value measurements on a recurring basis | Natural gas contracts | Level 2
Assets
Derivative asset	2.0	1.8
Liabilities
Derivative liability	0.5	0.8
Fair value measurements on a recurring basis | Natural gas contracts | Level 3
Assets
Derivative asset	0.0	0.0
Liabilities
Derivative liability	0.0	0.0
Fair value measurements on a recurring basis | FTRs
Assets
Derivative asset	10.4	7.4
Fair value measurements on a recurring basis | FTRs | Level 1
Assets
Derivative asset	0.0	0.0
Fair value measurements on a recurring basis | FTRs | Level 2
Assets
Derivative asset	0.0	0.0
Fair value measurements on a recurring basis | FTRs | Level 3
Assets
Derivative asset	10.4	7.4
Fair value measurements on a recurring basis | Coal contracts
Assets
Derivative asset	0.8	0.4
Liabilities
Derivative liability	0.1	0.1
Fair value measurements on a recurring basis | Coal contracts | Level 1
Assets
Derivative asset	0.0	0.0
Liabilities
Derivative liability	0.0	0.0
Fair value measurements on a recurring basis | Coal contracts | Level 2
Assets
Derivative asset	0.8	0.4
Liabilities
Derivative liability	0.1	0.1
Fair value measurements on a recurring basis | Coal contracts | Level 3
Assets
Derivative asset	0.0	0.0
Liabilities
Derivative liability	0.0	0.0
Fair value measurements on a recurring basis | Interest rate swaps
Liabilities
Derivative liability	6.7	2.3
Fair value measurements on a recurring basis | Interest rate swaps | Level 1
Liabilities
Derivative liability	0.0	0.0
Fair value measurements on a recurring basis | Interest rate swaps | Level 2
Liabilities
Derivative liability	6.7	2.3
Fair value measurements on a recurring basis | Interest rate swaps | Level 3
Liabilities
Derivative liability	$ 0.0	$ 0.0

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FAIR VALUE MEASUREMENTS - UNREALIZED GAIN (LOSS) ON INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Net unrealized gains included in earnings related to investments held in rabbi trust	$ 2.8	$ 3.5	$ 11.4	$ 0.4

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FAIR VALUE MEASUREMENTS - LEVEL 3 RECONCILIATION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Balance at the beginning of the period	$ 3.1	$ 1.5	$ 7.4	$ 4.4
Purchases	12.8	18.4	12.8	18.4
Settlements	(5.5)	(3.2)	(9.8)	(6.1)
Balance at the end of period	$ 10.4	$ 16.7	$ 10.4	$ 16.7

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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Financial Instruments
Preferred stock	$ 30.4	$ 30.4
Finance lease obligation	21.0
Carrying Amount
Financial Instruments
Preferred stock	30.4	30.4
Long-term debt, including current portion	10,666.5	10,335.7
Capital lease obligations		23.3
Finance lease obligation	21.0
Fair Value
Financial Instruments
Preferred stock	28.2	28.3
Long-term debt, including current portion	$ 11,543.4	$ 10,554.9

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DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Asset
Other current derivative assets	$ 15.5	$ 15.3
Other long-term derivative assets	0.3	0.6
Derivative asset	15.8	15.9
Derivative Liability
Other current derivative liabilities	24.5	5.8
Other long-term derivative liabilities	6.6	2.1
Derivative liability	31.1	7.9
Natural gas contracts
Derivative Asset
Other current derivative assets	4.6	7.7
Other long-term derivative assets	0.0	0.4
Derivative Liability
Other current derivative liabilities	22.5	5.3
Other long-term derivative liabilities	1.8	0.2
FTRs
Derivative Asset
Other current derivative assets	10.4	7.4
Derivative Liability
Other current derivative liabilities	0.0	0.0
Coal contracts
Derivative Asset
Other current derivative assets	0.5	0.2
Other long-term derivative assets	0.3	0.2
Derivative Liability
Other current derivative liabilities	0.1	0.1
Other long-term derivative liabilities	0.0	0.0
Interest rate swaps
Derivative Asset
Other current derivative assets	0.0	0.0
Other long-term derivative assets	0.0	0.0
Derivative Liability
Other current derivative liabilities	1.9	0.4
Other long-term derivative liabilities	$ 4.8	$ 1.9

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DERIVATIVE INSTRUMENTS - GAINS (LOSSES) AND NOTIONAL VOLUMES (Details) gal in Millions, MWh in Millions, MMBTU in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) MMBTU MWh gal	Jun. 30, 2018 USD ($) MMBTU MWh gal	Jun. 30, 2019 USD ($) MMBTU MWh gal	Jun. 30, 2018 USD ($) MMBTU MWh gal
Realized Gain (Loss) on Derivatives, Net
Gains (Losses)	$ (0.1)	$ 1.9	$ 1.7	$ 0.9
Natural gas contracts
Realized Gain (Loss) on Derivatives, Net
Gains (Losses)	$ (3.1)	$ (2.3)	$ (3.6)	$ (7.5)
Notional Sales Volumes
Notional sales volumes | MMBTU	43.8	39.9	99.9	88.0
Petroleum products contracts
Realized Gain (Loss) on Derivatives, Net
Gains (Losses)	$ 0.0	$ 0.3	$ 0.0	$ 0.8
Notional Sales Volumes
Notional sales volumes (gallons) | gal	0.0	1.7	0.0	3.8
FTRs
Realized Gain (Loss) on Derivatives, Net
Gains (Losses)	$ 3.0	$ 3.9	$ 5.3	$ 7.6
Notional Sales Volumes
Notional sales volumes | MWh	8.0	6.8	16.1	15.0

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DERIVATIVE INSTRUMENTS - BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Cash collateral
Cash collateral in margin account	$ 30.2	$ 2.7
Cash collateral received in margin account		0.2
Offsetting Derivative Assets
Gross amount recognized on the balance sheet	15.8	15.9
Gross amount not offset on the balance sheet	(3.0)	(4.0)
Net amount	12.8	11.9
Collateral received		0.2
Offsetting Derivative Liabilities
Gross amount recognized on the balance sheet	31.1	7.9
Gross amount not offset on the balance sheet	(24.2)	(4.9)
Net amount	6.9	3.0
Collateral posted	$ 21.2	$ 1.1

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DERIVATIVE INSTRUMENTS - CASH FLOW HEDGES (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) number_of_interest_rate_swaps	Jun. 30, 2018 USD ($)
Derivative [Line Items]
Interest expense	$ 124.1	$ 108.5	$ 248.5	$ 215.2
WEC Energy Group | WEC 2007 Junior Notes due 2067
Derivative [Line Items]
Long-term debt outstanding	500.0		$ 500.0
WEC Energy Group | Interest rate swaps
Derivative [Line Items]
Number of interest rate swaps executed | number_of_interest_rate_swaps			2
Interest rate swap notional value	$ 250.0		$ 250.0
Interest rate swap fixed interest rate	4.9765%		4.9765%
Derivative losses recognized in other comprehensive loss	$ (3.2)	0.0	$ (4.8)	0.0
Net derivative gains reclassified from accumulated other comprehensive loss to interest expense	0.4	$ 0.5	0.8	$ 1.1
Amount to be reclassified from accumulated other comprehensive loss to interest expense	$ 0.3		$ 0.3

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GUARANTEES (Details) $ in Millions	Jun. 30, 2019 USD ($)
Guarantees
Total guarantees	$ 128.1
Guarantees expiring in less than 1 year	17.3
Guarantees expiring within 1 to 3 years	1.2
Guarantees with expiration over 3 years	109.6
Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	6.7
Guarantees expiring in less than 1 year	6.7
Guarantees expiring within 1 to 3 years	0.0
Guarantees with expiration over 3 years	0.0
Standby letters of credit
Guarantees
Total guarantees	101.3
Guarantees expiring in less than 1 year	1.0
Guarantees expiring within 1 to 3 years	0.2
Guarantees with expiration over 3 years	100.1
Surety bonds
Guarantees
Total guarantees	9.7
Guarantees expiring in less than 1 year	9.6
Guarantees expiring within 1 to 3 years	0.1
Guarantees with expiration over 3 years	0.0
Other guarantees
Guarantees
Total guarantees	10.4
Guarantees expiring in less than 1 year	0.0
Guarantees expiring within 1 to 3 years	0.9
Guarantees with expiration over 3 years	9.5
Other indemnifications
Guarantees
Total guarantees	10.4
Liability related to workers compensation coverage	9.5
Bluewater | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	2.7
UMERC | Guarantees supporting commodity transactions of subsidiaries
Guarantees
Total guarantees	$ 4.0

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EMPLOYEE BENEFITS-COSTS AND CONTRIBUTIONS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Components of net periodic benefit cost
Contributions and payments related to pension and OPEB plans			$ 8.3	$ 9.7
Pension Costs
Components of net periodic benefit cost
Service cost	$ 11.8	$ 11.8	23.1	23.8
Interest cost	30.2	28.7	60.8	57.0
Expected return on plan assets	(48.2)	(48.8)	(96.9)	(98.4)
Loss on plan settlement	1.0	0.3	1.8	0.7
Amortization of prior service (credit) cost	0.5	0.6	1.1	1.3
Amortization of net actuarial (gain) loss	18.7	23.9	37.7	47.0
Net periodic benefit (credit) cost	14.0	16.5	27.6	31.4
Contributions and payments related to pension and OPEB plans			6.9
Estimated future employer contributions for the remainder of the year	4.9		4.9
Other Postretirement Benefit Costs
Components of net periodic benefit cost
Service cost	3.8	5.6	8.2	11.8
Interest cost	6.3	7.4	12.8	14.9
Expected return on plan assets	(13.6)	(14.8)	(27.3)	(29.7)
Amortization of prior service (credit) cost	(3.8)	(3.9)	(7.7)	(7.7)
Amortization of net actuarial (gain) loss	(2.0)	0.2	(2.7)	0.5
Net periodic benefit (credit) cost	(9.3)	$ (5.5)	(16.7)	$ (10.2)
Contributions and payments related to pension and OPEB plans			1.4
Estimated future employer contributions for the remainder of the year	$ 5.3		$ 5.3

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GOODWILL (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill
Changes to the carrying amount of goodwill	$ 0.0
Changes to our goodwill balances by segment
Goodwill balance by segment	3,052.8
Accumulated impairment losses	0.0
Wisconsin
Changes to our goodwill balances by segment
Goodwill balance by segment	2,104.3
Illinois
Changes to our goodwill balances by segment
Goodwill balance by segment	758.7
Other States
Changes to our goodwill balances by segment
Goodwill balance by segment	183.2
Non-Utility Energy Infrastructure
Changes to our goodwill balances by segment
Goodwill balance by segment	$ 6.6

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INVESTMENT IN TRANSMISSION AFFILIATES - CHANGES TO INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,670.6	$ 1,598.9	$ 1,665.3	$ 1,553.4
Add: Earnings (loss) from equity method investment	36.9	28.7	73.0	61.5
Add: Capital contributions	18.5	19.6	21.9	32.4
Less: Distributions	29.4	50.7	63.6	50.7
Less: Other	0.1	0.1	0.1
Investment in transmission affiliates, balance at end of period	$ 1,696.5	1,596.6	$ 1,696.5	1,596.6
ATC
Investment in transmission affiliates
Equity method investment, ownership interest (as a percent)	60.00%		60.00%
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 1,630.6	1,561.1	$ 1,625.3	1,515.8
Add: Earnings (loss) from equity method investment	37.4	29.8	73.9	63.2
Add: Capital contributions	18.1	18.1	21.1	30.1
Less: Distributions	29.4	50.7	63.6	50.7
Less: Other	0.1	0.1	0.1
Investment in transmission affiliates, balance at end of period	$ 1,656.6	1,558.4	$ 1,656.6	1,558.4
Dividends receivable from ATC		24.2		24.2	$ 39.9
ATC Holdco
Investment in transmission affiliates
Equity method investment, ownership interest (as a percent)	75.00%		75.00%
Changes to investments in transmission affiliates
Investment in transmission affiliates, balance at beginning of period	$ 40.0	37.8	$ 40.0	37.6
Add: Earnings (loss) from equity method investment	(0.5)	(1.1)	(0.9)	(1.7)
Add: Capital contributions	0.4	1.5	0.8	2.3
Less: Distributions	0.0	0.0	0.0	0.0
Less: Other	0.0	0.0	0.0
Investment in transmission affiliates, balance at end of period	$ 39.9	$ 38.2	$ 39.9	$ 38.2

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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS (Details) - ATC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investment in transmission affiliates
Charges to ATC for services and construction	$ 3.3	$ 4.1	$ 7.3	$ 8.7
Charges from ATC for network transmission services	87.0	84.6	174.1	169.1
Refund from ATC related to a FERC audit	$ 0.0	$ 22.0	$ 0.0	$ 22.0

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INVESTMENT IN TRANSMISSION AFFILIATES - RELATED PARTY TRANSACTIONS BALANCE SHEET INFORMATION (Details) - ATC - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Investment in transmission affiliates
Accounts receivable for services provided to ATC	$ 2.3	$ 3.4
Accounts payable for services received from ATC	29.0	28.2
Amounts due from ATC for transmission infrastructure upgrades	$ 0.0	$ 29.4

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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income statement data
Operating revenues	$ 182.2	$ 165.5	$ 359.9	$ 330.9
Operating expenses	93.6	91.5	184.0	176.4
Other expense, net	28.6	25.4	57.4	53.0
Net income	60.0	$ 48.6	118.5	$ 101.5
Balance sheet data
Current assets	88.8		88.8		$ 87.2
Noncurrent assets	5,100.7		5,100.7		4,928.8
Total assets	5,189.5		5,189.5		5,016.0
Current liabilities	562.1		562.1		640.0
Long-term debt	2,213.0		2,213.0		2,014.0
Other noncurrent liabilities	294.4		294.4		295.3
Shareholders' equity	2,120.0		2,120.0		2,066.7
Total liabilities and shareholders' equity	$ 5,189.5		$ 5,189.5		$ 5,016.0

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SEGMENT INFORMATION (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)
Segment information
Number of reportable segments | segment			6
Operating revenues	$ 1,590.2	$ 1,672.5	$ 3,967.6	$ 3,959.0
Other operation and maintenance	503.6	537.7	1,054.2	1,049.6
Depreciation and amortization	229.9	206.7	456.3	415.3
Operating income (loss)	314.6	330.8	857.4	875.9
Equity in earnings of transmission affiliates	36.9	28.7	73.0	61.5
Interest expense	124.1	108.5	248.5	215.2
Wisconsin
Segment information
Operating revenues	1,253.3	1,325.5	2,886.7	2,914.6
Illinois
Segment information
Operating revenues	242.9	268.0	779.4	775.3
Other States
Segment information
Operating revenues	68.8	72.4	254.0	242.3
Electric Transmission
Segment information
Other operation and maintenance	0.0	0.0	0.0	0.0
Depreciation and amortization	0.0	0.0	0.0	0.0
Operating income (loss)	0.0	0.0	0.0	0.0
Equity in earnings of transmission affiliates	36.9	28.7	73.0	61.5
Interest expense	2.7	0.0	$ 5.3	0.0
Non-Utility Energy Infrastructure
Segment information
Natural gas storage needs provided to Wisconsin utilities			33.00%
Operating revenues	123.3	117.0	$ 251.1	235.1
Other operation and maintenance	6.8	4.5	10.6	6.2
Depreciation and amortization	22.9	18.3	45.5	36.6
Operating income (loss)	91.3	92.4	184.0	185.4
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	15.5	16.0	31.2	32.1
Corporate and Other
Segment information
Operating revenues	0.9	3.1	2.6	4.5
Other operation and maintenance	1.8	2.2	0.8	1.9
Depreciation and amortization	6.0	7.5	12.4	15.2
Operating income (loss)	(7.1)	(6.5)	(11.0)	(11.9)
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	36.5	30.3	71.6	58.3
Reconciling Eliminations
Segment information
Other operation and maintenance	0.7	(100.4)	0.0	(197.2)
Depreciation and amortization	(3.6)	0.0	(8.2)	0.0
Operating income (loss)	(87.0)	0.0	(174.2)	0.0
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	$ (89.1)	(0.7)	$ (178.6)	(1.9)
ATC | Electric Transmission
Segment information
Equity method investment, ownership interest (as a percent)	60.00%		60.00%
ATC Holdco
Segment information
Equity method investment, ownership interest (as a percent)	75.00%		75.00%
Equity in earnings of transmission affiliates	$ (0.5)	(1.1)	$ (0.9)	(1.7)
ATC Holdco | Electric Transmission
Segment information
Equity method investment, ownership interest (as a percent)	75.00%		75.00%
Bishop Hill III Wind Energy Center | Non-Utility Energy Infrastructure
Segment information
WEC's ownership interest in Bishop Hill III Wind Energy Center	90.00%		90.00%
Coyote Ridge Wind | Non-Utility Energy Infrastructure
Segment information
WEC's ownership interest in Coyote Ridge Wind, LLC	80.00%		80.00%
Upstream
Segment information
WEC's ownership interest in Upstream Wind Energy Center	80.00%		80.00%
Upstream | Non-Utility Energy Infrastructure
Segment information
WEC's ownership interest in Upstream Wind Energy Center	80.00%		80.00%
Total utility revenues
Segment information
Other operation and maintenance	$ 494.3	631.4	$ 1,042.8	1,238.7
Depreciation and amortization	204.6	180.9	406.6	363.5
Operating income (loss)	317.4	244.9	858.6	702.4
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	158.5	62.9	319.0	126.7
Total utility revenues | Wisconsin
Segment information
Other operation and maintenance	363.9	502.4	756.6	970.9
Depreciation and amortization	152.9	134.6	303.9	269.7
Operating income (loss)	270.2	195.1	632.0	468.8
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	142.7	48.5	286.1	97.9
Total utility revenues | Illinois
Segment information
Other operation and maintenance	107.0	104.1	235.2	216.3
Depreciation and amortization	45.0	41.8	89.5	82.7
Operating income (loss)	42.6	41.7	180.5	189.3
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	13.9	12.3	28.7	24.6
Total utility revenues | Other States
Segment information
Other operation and maintenance	23.4	24.9	51.0	51.5
Depreciation and amortization	6.7	4.5	13.2	11.1
Operating income (loss)	4.6	8.1	46.1	44.3
Equity in earnings of transmission affiliates	0.0	0.0	0.0	0.0
Interest expense	1.9	2.1	4.2	4.2
External Revenues
Segment information
Operating revenues	1,590.2	1,672.5	3,967.6	3,959.0
External Revenues | Electric Transmission
Segment information
Operating revenues	0.0	0.0	0.0	0.0
External Revenues | Non-Utility Energy Infrastructure
Segment information
Operating revenues	24.3	3.5	44.9	22.3
External Revenues | Corporate and Other
Segment information
Operating revenues	0.9	3.1	2.6	4.5
External Revenues | Reconciling Eliminations
Segment information
Operating revenues	0.0	0.0	0.0	0.0
External Revenues | Total utility revenues
Segment information
Operating revenues	1,565.0	1,665.9	3,920.1	3,932.2
External Revenues | Total utility revenues | Wisconsin
Segment information
Operating revenues	1,253.3	1,325.5	2,886.7	2,914.6
External Revenues | Total utility revenues | Illinois
Segment information
Operating revenues	242.9	268.0	779.4	775.3
External Revenues | Total utility revenues | Other States
Segment information
Operating revenues	68.8	72.4	254.0	242.3
Intersegment Transactions [Member]
Segment information
Operating revenues	0.0	0.0	0.0	0.0
Intersegment Transactions [Member] | Electric Transmission
Segment information
Operating revenues	0.0	0.0	0.0	0.0
Intersegment Transactions [Member] | Non-Utility Energy Infrastructure
Segment information
Operating revenues	99.0	113.5	206.2	212.8
Intersegment Transactions [Member] | Corporate and Other
Segment information
Operating revenues	0.0	0.0	0.0	0.0
Intersegment Transactions [Member] | Reconciling Eliminations
Segment information
Operating revenues	(99.0)	(113.5)	(206.2)	(212.8)
Intersegment Transactions [Member] | Total utility revenues
Segment information
Operating revenues	0.0	0.0	0.0	0.0
Intersegment Transactions [Member] | Total utility revenues | Wisconsin
Segment information
Operating revenues	0.0	0.0	0.0	0.0
Intersegment Transactions [Member] | Total utility revenues | Illinois
Segment information
Operating revenues	0.0	0.0	0.0	0.0
Intersegment Transactions [Member] | Total utility revenues | Other States
Segment information
Operating revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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VARIABLE INTEREST ENTITIES (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) MW	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Variable interest entities
Equity investment	$ 1,696.5	$ 1,670.6	$ 1,665.3	$ 1,596.6	$ 1,598.9	$ 1,553.4
Firm capacity from purchased power agreement (in megawatts) | MW	236
Minimum energy requirements over remaining term of purchased power agreement (in megawatts) | MW	0
ATC
Variable interest entities
Ownership interest (as a percent)	60.00%
Equity investment	$ 1,656.6		1,625.3
ATC Holdco
Variable interest entities
Ownership interest (as a percent)	75.00%
Equity investment	$ 39.9		$ 40.0
Purchased power agreement
Variable interest entities
Firm capacity from purchased power agreement (in megawatts) | MW	236
Minimum energy requirements over remaining term of purchased power agreement (in megawatts) | MW	0
Remaining term of purchased power agreement (in years)	3 years
Residual guarantee associated with purchased power agreement	$ 0.0
Required payments over remaining term of purchased power agreement	$ 26.5

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COMMITMENTS AND CONTINGENCIES - UNCONDITIONAL PURCHASE OBLIGATIONS (Details) $ in Billions	Jun. 30, 2019 USD ($)
Minimum future commitments for purchase obligations
Purchase obligations	$ 11.9

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COMMITMENTS AND CONTINGENCIES - ENVIRONMENTAL MATTERS (Details) $ in Millions	1 Months Ended		6 Months Ended
	Apr. 30, 2019 degreecelsius	Dec. 31, 2018 USD ($) change	Jun. 30, 2019 USD ($) generating_units MW
Manufactured gas plant remediation
Regulatory assets		$ 3,855.8	$ 4,035.3
Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets		$ 687.1	$ 707.6
Mercury and Air Toxics Standards | Electric
Air quality
Revisions to Mercury and Air Toxics Standards | change		0
Climate Change | Electric
Air quality
Company goal for percentage of carbon dioxide emissions reduction by 2030			40.00%
Long-term company goal for percentage of carbon dioxide emissions reduction by 2050			80.00%
Capacity of coal generation retired since the beginning of 2018 | MW			1,800
Climate Change | Electric | Maximum
Air quality
Global temperature increases limit | degreecelsius	2
Steam Electric Effluent Limitation Guidelines | Electric
Water quality
Number of generating units of OCPP and ERGS | generating_units			6
Expected cost to achieve required emissions reductions			$ 70.0
Manufactured Gas Plant Remediation | Natural gas
Manufactured gas plant remediation
Reserves for future remediation		$ 616.4	631.8
Manufactured Gas Plant Remediation | Natural gas | Environmental remediation costs
Manufactured gas plant remediation
Regulatory assets		$ 687.1	$ 707.6

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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Supplemental cash flow information
Cash (paid) for interest, net of amount capitalized	$ (247.9)	$ (215.6)
Cash (paid) for income taxes, net	(15.1)	(47.6)
Significant non-cash investing and financing transactions
Accounts payable related to construction costs	137.3	77.4
Non-cash capital contributions from noncontrolling interest	$ 10.2	$ 0.0

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SUPPLEMENTAL CASH FLOW INFORMATION - RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 37.9	$ 84.5	$ 29.8
Restricted cash included in other long term assets	52.8		22.2
Cash, cash equivalents, and restricted cash	$ 90.7	$ 146.1	$ 52.0	$ 58.6

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REGULATORY ENVIRONMENT (Details) $ in Millions	1 Months Ended					6 Months Ended
	Jun. 30, 2019 USD ($) Assurance	Mar. 31, 2019 USD ($) company	Dec. 31, 2018 USD ($)	Feb. 28, 2018 Filings	Sep. 30, 2017 USD ($) utility	Jun. 30, 2019 USD ($) Assurance	Aug. 01, 2019 USD ($) MW	May 31, 2018 USD ($) solar_projects MW
WE | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Electric rates
Regulatory environment
Requested rate increase		$ 83.0
Requested rate increase (as a percent)		2.90%
WE | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Natural gas rates
Regulatory environment
Requested rate increase		$ 15.0
Requested rate increase (as a percent)		3.90%
WE | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Steam rates
Regulatory environment
Requested rate increase		$ 1.0
Requested rate increase (as a percent)		4.50%
WE | Public Service Commission of Wisconsin (PSCW) | 2021 rates | Electric rates
Regulatory environment
Requested rate increase		$ 83.0
Requested rate increase (as a percent)		2.90%
WE | Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates
Regulatory environment
Requested return on equity (as a percent)		10.35%
WE | Public Service Commission of Wisconsin (PSCW) | 2018 and 2019 rates
Regulatory environment
Approved return on equity (as a percent)					10.20%
Income statement impact of flow through of repair-related deferred tax liabilities						$ 0.0
WG | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Natural gas rates
Regulatory environment
Requested rate increase		$ 11.0
Requested rate increase (as a percent)		1.80%
WG | Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates
Regulatory environment
Requested return on equity (as a percent)		10.30%
WG | Public Service Commission of Wisconsin (PSCW) | 2018 and 2019 rates
Regulatory environment
Approved return on equity (as a percent)					10.30%
WPS | Public Service Commission of Wisconsin (PSCW) | Badger hollow solar farm and two creeks solar project
Regulatory environment
Number of solar projects for which approval has been requested | solar_projects								2
Total output of two solar projects owned by WPS (in megawatts) | MW								200
WPS share of cost for certain solar projects								$ 260.0
WPS | Public Service Commission of Wisconsin (PSCW) | Two creeks solar project
Regulatory environment
Solar project output owned by WPS (in megawatts) | MW								100
WPS | Public Service Commission of Wisconsin (PSCW) | Badger hollow I solar farm
Regulatory environment
Solar project output owned by WPS (in megawatts) | MW								100
WPS | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Electric rates
Regulatory environment
Requested rate increase		$ 49.0
Requested rate increase (as a percent)		4.90%
WPS | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Natural gas rates
Regulatory environment
Requested rate increase		$ 7.0
Requested rate increase (as a percent)		2.40%
WPS | Public Service Commission of Wisconsin (PSCW) | 2021 rates | Electric rates
Regulatory environment
Requested rate increase		$ 49.0
Requested rate increase (as a percent)		4.90%
WPS | Public Service Commission of Wisconsin (PSCW) | 2021 rates | Natural gas rates
Regulatory environment
Requested rate increase		$ 7.0
Requested rate increase (as a percent)		2.40%
WPS | Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates
Regulatory environment
Requested return on equity (as a percent)		10.35%
WPS | Public Service Commission of Wisconsin (PSCW) | 2018 and 2019 rates
Regulatory environment
Approved return on equity (as a percent)					10.00%
Authorized revenue requirement for the ReACT project					$ 275.0
AFUDC					51.0
Estimated cost of the ReACT project, excluding AFUDC					$ 342.0
WE, WG, and WPS | Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates
Regulatory environment
Number of companies filing rate increase request | company		3
Requested common equity component average (as a percent)		52.00%
WE, WG, and WPS | Public Service Commission of Wisconsin (PSCW) | 2018 and 2019 rates
Regulatory environment
Number of utilities with earnings sharing mechanism | utility					3
Percentage of first 50 basis points of additional utility earnings shared with customers					50.00%
Return on equity in excess of authorized amount (as a percent)					0.50%
PGL | Illinois Commerce Commission (ICC)
Regulatory environment
Rate base reduction from settlement of 2015 reconciliation	$ 7.0					$ 7.0
Refund to ratepayers from settlement of 2015 reconciliation	$ 7.3
Amount of assurance that PGL's QIP rider costs will be recoverable | Assurance	0					0
MERC | Minnesota Public Utilities Commission (MPUC) | 2018 rates | Natural gas rates
Regulatory environment
Change in regulatory liabilities from tax legislation						$ 7.6
Approved return on equity (as a percent)			9.70%
Approved rate increase			$ 3.1
Approved rate increase (as a percent)			1.26%
Approved common equity component average (as a percent)			50.90%
MGU and UMERC | Michigan Public Service Commission (MPSC)
Regulatory environment
Number of filings required related to the Tax Cuts and Jobs Act of 2017 | Filings				3
Tax Cuts and Jobs Act of 2017 | WE | Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | Electric rates
Regulatory environment
Change in regulatory liabilities from tax legislation		$ 111.0
Tax Cuts and Jobs Act of 2017 | WPS | Public Service Commission of Wisconsin (PSCW) | 2020 rates | Natural gas rates
Regulatory environment
Change in regulatory liabilities from tax legislation		7.0
Tax Cuts and Jobs Act of 2017 | WPS | Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | Electric rates
Regulatory environment
Change in regulatory liabilities from tax legislation		$ 40.0
Subsequent event | WE | Public Service Commission of Wisconsin (PSCW) | Badger hollow II solar farm
Regulatory environment
Solar project output that approval was requested for from the PSCW (in megawatts) | MW							100
WE share of cost of badger hollow II							$ 130.0