Segment Information

9 Months Ended

Sep. 30, 2015

Segment Information [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

We reorganized our business segments during the third quarter of 2015 to reflect our new internal organization and management structure following the acquisition of Integrys. We use operating income to measure segment profitability and allocate resources to our businesses. All prior period amounts impacted by this change were reclassified to conform to the new presentation. At September 30, 2015, we reported six segments, which are described below.

• The Wisconsin segment includes the electric and natural gas utility and nonutility operations of Wisconsin Electric, Wisconsin Gas, and WPS, including Wisconsin Electric's and WPS's electric and natural gas operations in the state of Michigan.

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

• The Other States segment includes the natural gas utility and nonutility operations of MERC and MGU.

• The Electric Transmission segment includes our approximate 60% ownership interest in ATC, a federally regulated electric transmission company.

• We Power is our non-regulated entity that owns and leases generating facilities to Wisconsin Electric.

• The Corporate and Other segment includes all other nonutility activities of the holding company, Wispark LLC, Bostco LLC, Wisconsin Energy Capital Corporation (WECC), ITF, PDL, Integrys, Peoples Energy, LLC holding company, and WBS.

Summarized financial information concerning our reportable segments for the three and nine months ended September 30, 2015 and 2014, is shown in the following tables:

	Regulated Operations
(in millions)	Wisconsin		Illinois		Other States			Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
September 30, 2015
Operating revenues	$	1,442.3	$	171.8	$	49.6		$	—	$	1,663.7	$	110.7	$	27.9		$	(103.6	)	$	1,698.7
Other operation and maintenance	501.9		101.0		23.1			—		626.0		0.6		12.9			(103.6		)	535.9
Depreciation and amortization	117.5		31.2		4.9			—		153.6		16.9		6.0			—			176.5
Operating income (loss)	256.6		3.5		(3.7		)	—		256.4		93.2		(3.9		)	—			345.7
Equity in earnings of unconsolidated affiliates	0.2		—		—			40.0		40.2		—		(0.3		)	0.1			40.0
Interest expense	46.5		9.7		2.6			—		58.8		15.8		31.6			(2.4		)	103.8

	Regulated Operations
(in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Three Months Ended
September 30, 2014
Operating revenues	$	1,017.7	$	—	$	—	$	—	$	1,017.7	$	109.0	$	5.3		$	(98.7	)	$	1,033.3
Other operation and maintenance	337.4		—		—		—		337.4		0.4		9.0			(97.4		)	249.4
Depreciation and amortization	82.8		—		—		—		82.8		16.7		0.4			(0.1		)	99.8
Operating income (loss)	158.4		—		—		—		158.4		92.0		(4.3		)	—			246.1
Equity in earnings of unconsolidated affiliates	—		—		—		18.0		18.0		—		—			—			18.0
Interest expense	32.1		—		—		—		32.1		16.1		12.4			(0.2		)	60.4

	Regulated Operations
(in millions)	Wisconsin		Illinois		Other States			Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Nine Months Ended
September 30, 2015
Operating revenues	$	3,799.1	$	171.8	$	49.6		$	—	$	4,020.5	$	333.1	$	31.3		$	(307.1	)	$	4,077.8
Other operation and maintenance	1,239.3		101.0		23.1			—		1,363.4		3.7		93.1			(306.6		)	1,153.6
Depreciation and amortization	289.2		31.2		4.9			—		325.3		50.6		6.8			(0.1		)	382.6
Operating income (loss)	673.5		3.5		(3.7		)	—		673.3		278.9		(81.9		)	—			870.3
Equity in earnings of unconsolidated affiliates	0.2		—		—			70.4		70.6		—		(0.4		)	0.2			70.4
Interest expense	110.6		9.7		2.6			—		122.9		47.6		57.5			(2.4		)	225.6

	Regulated Operations
(in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
Nine Months Ended
September 30, 2014
Operating revenues	$	3,729.6	$	—	$	—	$	—	$	3,729.6	$	328.1	$	8.6		$	(294.3	)	$	3,772.0
Other operation and maintenance	1,048.6		—		—		—		1,048.6		3.6		19.1			(290.5		)	780.8
Depreciation and amortization	244.1		—		—		—		244.1		49.9		1.2			—			295.2
Operating income (loss)	606.3		—		—		—		606.3		274.6		(12.3		)	—			868.6
Equity in earnings of unconsolidated affiliates	—		—		—		52.8		52.8		—		—			—			52.8
Interest expense	96.8		—		—		—		96.8		48.6		36.8			(0.5		)	181.7