Segment Information

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

During the third quarter of 2015, following the acquisition of Integrys, we reorganized our business segments to reflect our new internal organization and management structure. All prior period amounts impacted by this change were reclassified to conform to the new presentation. We use operating income to measure segment profitability and to allocate resources to our businesses. At December 31, 2015, we reported six segments, which are described below.

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

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

• 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 federally regulated electric transmission company.

• The We Power segment includes our nonregulated entity that owns and leases generating facilities to Wisconsin Electric.

• The corporate and other segment includes the operations of the WEC Energy Group holding company, the Integrys holding company, the PELLC holding company, Wispark, Bostco, Wisvest, WECC, WBS, PDL, and ITF.

All of our operations and assets are located within the United States. The following tables show summarized financial information concerning our reportable segments for the years ended December 31, 2015, 2014, and 2013.

	Regulated Operations
2015 (in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
External revenues	$	5,186.1	$	503.4	$	149.3	$	—	$	5,838.8	$	40.0	$	47.3		$	—		$	5,926.1
Intersegment revenues	5.0		—		—		—		5.0		405.2		—			(410.2		)	—
Other operation and maintenance	1,741.0		219.6		50.0		—		2,010.6		4.3		103.7			(409.3		)	1,709.3
Depreciation and amortization	408.6		63.3		10.0		—		481.9		67.5		12.4			—			561.8
Operating income (loss)	884.2		78.1		6.0		—		968.3		373.4		(91.2		)	—			1,250.5
Equity in earnings of transmission affiliate	—		—		—		96.1		96.1		—		—			—			96.1
Interest expense	157.1		19.9		5.1		—		182.1		63.4		91.0			(5.1		)	331.4
Capital expenditures	950.3		194.4		34.7		—		1,179.4		53.4		33.4			—			1,266.2
Total assets *	21,113.5		5,462.9		918.0		1,381.0		28,875.4		2,779.0		1,132.5			(3,431.7		)	29,355.2

* Total assets at December 31, 2015 reflect an elimination of $2,105.3 million for all PTF activity between We Power and Wisconsin Electric.

	Regulated Operations
2014 (in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
External revenues	$	4,932.1	$	—	$	—	$	—	$	4,932.1	$	55.7	$	9.3		$	—		$	4,997.1
Intersegment revenues	9.2		—		—		—		9.2		383.4		—			(392.6		)	—
Other operation and maintenance	1,462.7		—		—		—		1,462.7		4.4		33.0			(387.7		)	1,112.4
Depreciation and amortization	323.2		—		—		—		323.2		66.7		1.5			—			391.4
Operating income (loss)	770.2		—		—		—		770.2		368.0		(26.1		)	—			1,112.1
Equity in earnings of transmission affiliate	—		—		—		66.0		66.0		—		—			—			66.0
Interest expense	127.6		—		—		—		127.6		64.6		48.8			(0.7		)	240.3
Capital expenditures	715.0		—		—		—		715.0		41.0		5.2			—			761.2
Total assets *	14,403.8		—		—		424.1		14,827.9		2,789.9		253.3			(2,966.1		)	14,905.0

* Total assets at December 31, 2014 reflect an elimination of $2,172.9 million for all PTF activity between We Power and Wisconsin Electric.

	Regulated Operations
2013 (in millions)	Wisconsin		Illinois		Other States		Electric Transmission		Total Regulated Operations		We Power		Corporate and Other			Reconciling Eliminations			WEC Energy Group Consolidated
External revenues	$	4,451.9	$	—	$	—	$	—	$	4,451.9	$	56.6	$	10.5		$	—		$	4,519.0
Intersegment revenues	10.1		—		—		—		10.1		380.9		—			(391.0		)	—
Other operation and maintenance	1,522.0		—		—		—		1,522.0		4.6		14.2			(385.8		)	1,155.0
Depreciation and amortization	272.2		—		—		—		272.2		66.3		1.6			—			340.1
Operating income	719.4		—		—		—		719.4		366.6		(5.9		)	—			1,080.1
Equity in earnings of transmission affiliate	—		—		—		68.5		68.5		—		—			—			68.5
Interest expense	135.0		—		—		—		135.0		65.7		50.8			(0.6		)	250.9
Capital expenditures	695.7		—		—		—		695.7		25.8		3.7			—			725.2
Total assets *	13,934.6		—		—		402.7		14,337.3		2,814.6		213.6			(2,922.3		)	14,443.2

* Total assets at December 31, 2013 reflect an elimination of $2,231.2 million for all PTF activity between We Power and Wisconsin Electric.