Segment Information

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

SEGMENT INFORMATION

SEGMENT INFORMATION

During the second quarter of 2016, 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, 2016, we reported two segments, which are described below.

Our utility segment includes our electric and natural gas utility operations. Our electric utility operations are engaged in the generation, distribution, and sale of electricity in southeastern Wisconsin (including metropolitan Milwaukee), east central Wisconsin, northern Wisconsin, and the Upper Peninsula of Michigan. Effective January 1, 2017, we transferred all of our electric distribution assets and customers located in the Upper Peninsula of Michigan to UMERC, with the exception of the Tilden Mining Company. See Note 4, Related Parties, and Note 20, Regulatory Environment, for additional information. Our electric utility operations also include our steam operations which produce, distribute, and sell steam to customers in metropolitan Milwaukee, Wisconsin. Our natural gas utility operations are engaged in the purchase, distribution, and sale of natural gas to retail customers and the transportation of customer-owned natural gas in our three service areas within southeastern, east central, and northern Wisconsin.

At December 31, 2016, our other segment included our approximate 23% ownership interest in ATC, a for-profit, electric transmission company regulated by the FERC and certain state regulatory commissions, and Bostco, our non-utility subsidiary, that develops and invests in real estate. Effective January 1, 2017, we transferred our investment in ATC to another subsidiary of WEC Energy Group. See Note 5, Investment in American Transmission Company, for more information.

All of our operations and assets are located within the United States. The following tables show summarized financial information related to our reportable segments for the years ended December 31, 2016, 2015, and 2014.

2016 (in millions)	Utility		Other		Wisconsin Electric Power Company Consolidated
Operating revenues	$	3,792.8	$	—	$	3,792.8
Other operation and maintenance	1,430.2		—		1,430.2
Depreciation and amortization	325.4		—		325.4
Operating income	629.5		—		629.5
Equity in earnings of transmission affiliate	—		55.5		55.5
Interest expense	116.6		1.0		117.6
Capital expenditures	468.9		0.6		469.5
Total assets	12,945.1		426.4		13,371.5

2015 (in millions)	Utility		Other		Wisconsin Electric Power Company Consolidated
Operating revenues	$	3,854.1	$	—	$	3,854.1
Other operation and maintenance	1,384.9		—		1,384.9
Depreciation and amortization	304.0		—		304.0
Operating income	648.9		—		648.9
Equity in earnings of transmission affiliate	—		47.8		47.8
Interest expense	117.7		1.3		119.0
Capital expenditures	518.8		0.4		519.2
Total assets	12,727.6		412.0		13,139.6

2014 (in millions)	Utility		Other		Wisconsin Electric Power Company Consolidated
Operating revenues	$	4,059.4	$	—	$	4,059.4
Other operation and maintenance	1,356.4		—		1,356.4
Depreciation and amortization	278.3		—		278.3
Operating income	650.4		—		650.4
Equity in earnings of transmission affiliate	—		57.9		57.9
Interest expense	114.9		1.6		116.5
Capital expenditures	561.8		—		561.8
Total assets	12,195.9		401.3		12,597.2