Segment Information

9 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Segment Information

14.Segment Information - MGE Energy and MGE.

MGE Energy operates in the following business segments: electric utility, gas utility, nonregulated energy, transmission investment, and all other. See the 2022 Annual Report on Form 10-K for additional discussion of each of these segments.

(In thousands) MGE Energy	Electric		Gas			Non-Regulated Energy		Transmission Investment		All Others			Consolidation/ Elimination			Consolidated Total
Three Months Ended September 30, 2023
Operating revenues	$	138,891	$	21,424		$	213	$	—	$	—		$	—		$	160,528
Interdepartmental revenues		512		3,547			10,398		—		—			(14,457	)		—
Total operating revenues		139,403		24,971			10,611		—		—			(14,457	)		160,528
Equity in earnings of investments		—		—			—		2,690		—			—			2,690
Net income (loss)		31,126		(801	)		5,627		1,957		(52	)		—			37,857
Three Months Ended September 30, 2022
Operating revenues	$	132,876	$	30,310		$	214	$	—	$	—		$	—		$	163,400
Interdepartmental revenues		24		12,465			10,405		—		—			(22,894	)		—
Total operating revenues		132,900		42,775			10,619		—		—			(22,894	)		163,400
Equity in earnings of investments		—		—			—		1,499		—			—			1,499
Net income (loss)		27,619		(394	)		5,576		1,091		(172	)		—			33,720
Nine Months Ended September 30, 2023
Operating revenues	$	377,627	$	147,677		$	475	$	—	$	—		$	—		$	525,779
Interdepartmental revenues		653		12,978			31,143		—		—			(44,774	)		—
Total operating revenues		378,280		160,655			31,618		—		—			(44,774	)		525,779
Equity in earnings of investments		—		—			—		7,930		—			—			7,930
Net income (loss)		65,996		10,539			16,667		5,770		(1,356	)		—			97,616
Nine Months Ended September 30, 2022
Operating revenues	$	354,915	$	169,305		$	466	$	—	$	—		$	—		$	524,686
Interdepartmental revenues		76		26,645			31,073		—		—			(57,794	)		—
Total operating revenues		354,991		195,950			31,539		—		—			(57,794	)		524,686
Equity in earnings of investments		—		—			—		6,626		—			—			6,626
Net income		55,248		12,782			16,451		4,821		599			—			89,901

(In thousands) MGE	Electric		Gas			Non-Regulated Energy		Consolidation/ Elimination			Consolidated Total
Three Months Ended September 30, 2023
Operating revenues	$	138,891	$	21,424		$	213	$	—		$	160,528
Interdepartmental revenues		512		3,547			10,398		(14,457	)		—
Total operating revenues		139,403		24,971			10,611		(14,457	)		160,528
Net income (loss) attributable to MGE		31,126		(801	)		5,627		(5,487	)		30,465
Three Months Ended September 30, 2022
Operating revenues	$	132,876	$	30,310		$	214	$	—		$	163,400
Interdepartmental revenues		24		12,465			10,405		(22,894	)		—
Total operating revenues		132,900		42,775			10,619		(22,894	)		163,400
Net income (loss) attributable to MGE		27,619		(394	)		5,576		(5,603	)		27,198
Nine Months Ended September 30, 2023
Operating revenues	$	377,627	$	147,677		$	475	$	—		$	525,779
Interdepartmental revenues		653		12,978			31,143		(44,774	)		—
Total operating revenues		378,280		160,655			31,618		(44,774	)		525,779
Net income attributable to MGE		65,996		10,539			16,667		(16,382	)		76,820
Nine Months Ended September 30, 2022
Operating revenues	$	354,915	$	169,305		$	466	$	—		$	524,686
Interdepartmental revenues		76		26,645			31,073		(57,794	)		—
Total operating revenues		354,991		195,950			31,539		(57,794	)		524,686
Net income attributable to MGE		55,248		12,782			16,451		(15,947	)		68,534