Investment in ATC and ATC Holdco (Tables)

3 Months Ended

Mar. 31, 2022

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
	March 31,
(In thousands)	2022		2021
Equity earnings from investment in ATC	$	2,478	$	2,420
Dividends received from ATC		2,001		1,967
Capital contributions to ATC		1,243		—

ATC's summarized financial data is as follows:

	Three Months Ended
	March 31,
(In thousands)	2022			2021
Operating revenues	$	190,999		$	188,694
Operating expenses		(95,491	)		(95,104	)
Other income, net		404			378
Interest expense, net		(28,440	)		(28,871	)
Earnings before members' income taxes	$	67,472		$	65,097