Investment in ATC and ATC Holdco (Tables)

6 Months Ended

Jun. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments Financial Data

MGE Transco and MGEE Transco have accounted for their investment in ATC and ATC Holdco, respectively, under the equity method of accounting.Equity earnings from investments are recorded as "Other income" on MGE Energy's consolidated statements of income. For the three and six months endedJune 30,2017 and 2016, MGE Transco recorded the following:

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(In thousands)		2017		2016		2017		2016
Equity earnings from investment in ATC	$	2,486	$	1,767	$	5,094	$	4,000
Dividends from ATC(a)		2,000		1,863		2,000		2,728
Capital contributions to ATC		888		177		2,308		710

(a)As of December 31, 2016, MGE Transco recorded a $2.1 million receivable from ATC for a cash dividend received in January 2017.

ATC's summarized financial data for the three and six months endedJune 30,2017 and 2016, is as follows:

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(In thousands)		2017		2016		2017		2016
Operating revenues	$	176,610	$	154,225	$	351,279	$	318,465
Operating expenses		(82,665)		(81,698)		(165,053)		(160,763)
Other income, net		612		1,308		819		1,435
Interest expense, net		(26,299)		(24,882)		(52,915)		(49,090)
Earnings before members' income taxes	$	68,258	$	48,953	$	134,130	$	110,047