SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2019

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

Our utility segment includes our electric and natural gas utility operations, which serve customers in northeastern and central Wisconsin. Our electric utility operations are engaged in the generation, distribution, and sale of electricity. Our natural gas utility operations are engaged in the purchase, distribution, and sale of natural gas to retail customers as well as the transportation of customer-owned natural gas.

Our other segment includes equity earnings from our investment in Wisconsin River Power Company.

The following tables show summarized financial information for the three and six months ended June 30, 2019 and 2018, related to our reportable segments:



(in millions)	Utility		Other		Wisconsin Public Service Corporation
Three Months Ended June 30, 2019
Operating revenues	$	320.9	$	—	$	320.9
Other operation and maintenance	96.9		—		96.9
Depreciation and amortization	40.8		—		40.8
Operating income	59.8		—		59.8
Other income, net	9.5		0.4		9.9
Interest expense	15.3		—		15.3



(in millions)	Utility		Other			Wisconsin Public Service Corporation
Three Months Ended June 30, 2018
Operating revenues	$	350.1	$	—		$	350.1
Other operation and maintenance	105.2		0.2			105.4
Depreciation and amortization	33.6		—			33.6
Operating income (loss)	72.6		(0.2		)	72.4
Other income, net	7.9		0.9			8.8
Interest expense	13.2		—			13.2



(in millions)	Utility		Other		Wisconsin Public Service Corporation
Six Months Ended June 30, 2019
Operating revenues	$	716.7	$	—	$	716.7
Other operation and maintenance	201.3		—		201.3
Depreciation and amortization	81.1		—		81.1
Operating income	120.4		—		120.4
Other income, net	18.5		0.7		19.2
Interest expense	31.4		—		31.4



(in millions)	Utility		Other			Wisconsin Public Service Corporation
Six Months Ended June 30, 2018
Operating revenues	$	743.7	$	—		$	743.7
Other operation and maintenance	207.9		0.2			208.1
Depreciation and amortization	69.5		—			69.5
Operating income (loss)	141.9		(0.3		)	141.6
Other income, net	16.8		1.3			18.1
Interest expense	26.0		—			26.0