Investment in ATC and ATC Holdco (Tables)

9 Months Ended

Sep. 30, 2021

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments Financial Data

MGE Transco and MGEE Transco have accounted for their investments in ATC and ATC Holdco, respectively, under the equity method of accounting. Equity earnings from investments are recorded as "Other income" on the consolidated statements of income of MGE Energy. MGE Transco recorded the following amounts related to its investment in ATC:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands)	2021		2020		2021		2020
Equity earnings from investment in ATC	$	2,500	$	2,319	$	7,333	$	7,724
Dividends from investments		1,942		2,349		5,842		6,620
Capital contributions to ATC		—		359		—		892

ATC's summarized financial data is as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In thousands)	2021			2020			2021			2020
Operating revenues	$	186,785		$	187,833		$	561,379		$	577,705
Operating expenses		(91,340	)		(92,975	)		(278,828	)		(285,697	)
Other income, net		123			643			1,164			1,924
Interest expense, net		(28,674	)		(28,801	)		(86,337	)		(83,947	)
Earnings before members' income taxes	$	66,894		$	66,700		$	197,378		$	209,985