Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 22,807	$ 17,438
Accounts receivable, less reserves	41,190	46,205
Other accounts receivables, less reserves	10,033	16,094
Unbilled revenues	27,389	34,812
Materials and supplies, at average cost	31,178	29,863
Fuel for electric generation, at average cost	7,259	6,429
Stored natural gas, at average cost	22,299	15,668
Prepaid taxes	17,820	20,214
Regulatory assets - current	3,095	1,465
Other current assets	11,570	11,183
Total Current Assets	194,640	199,371
Other long-term receivables	824	1,155
Regulatory assets	111,469	107,547
Pension benefit asset	66,988	58,757
Other deferred assets and other	25,108	27,548
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,844,658	1,828,171
Construction work in progress	89,659	50,603
Total Property, Plant, and Equipment	1,934,317	1,878,774
Investments	103,885	98,754
Total Assets	2,437,231	2,371,906
Current Liabilities:
Long-term debt due within one year	24,251	4,889
Short-term debt	0	5,500
Accounts payable	88,833	64,149
Accrued interest and taxes	9,217	10,385
Accrued payroll related items	9,611	12,951
Regulatory liabilities - current	21,406	9,365
Derivative liabilities	0	2,140
Other current liabilities	7,389	8,468
Total Current Liabilities	160,707	117,847
Other Credits:
Deferred income taxes	240,423	231,149
Investment tax credit - deferred	48,304	44,836
Regulatory liabilities	155,067	154,298
Accrued pension and other postretirement benefits	72,388	73,085
Finance lease liabilities	16,941	17,322
Other deferred liabilities and other	94,655	91,690
Total Other Credits	627,778	612,380
Capitalization:
Common shareholders equity	1,056,057	1,027,468
Long-term debt	592,689	614,211
Total Capitalization	1,648,746	1,641,679
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	2,437,231	2,371,906
MGE [Member]
Current Assets:
Cash and cash equivalents	15,583	6,401
Accounts receivable, less reserves	41,190	46,205
Affiliate receivables	530	558
Other accounts receivables, less reserves	10,031	16,092
Unbilled revenues	27,389	34,812
Materials and supplies, at average cost	31,178	29,863
Fuel for electric generation, at average cost	7,259	6,429
Stored natural gas, at average cost	22,299	15,668
Prepaid taxes	18,233	19,379
Regulatory assets - current	3,095	1,465
Other current assets	11,432	11,071
Total Current Assets	188,219	187,943
Affiliate receivable long-term	1,324	1,589
Regulatory assets	111,469	107,547
Pension benefit asset	66,988	58,757
Other deferred assets and other	25,413	27,907
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,844,686	1,828,199
Construction work in progress	89,659	50,603
Total Property, Plant, and Equipment	1,934,345	1,878,802
Investments	126	230
Total Assets	2,327,884	2,262,775
Current Liabilities:
Long-term debt due within one year	24,251	4,889
Short-term debt	0	5,500
Accounts payable	88,801	64,130
Accrued interest and taxes	9,172	10,649
Accrued payroll related items	9,611	12,951
Regulatory liabilities - current	21,406	9,365
Derivative liabilities	0	2,140
Other current liabilities	7,440	5,968
Total Current Liabilities	160,681	115,592
Other Credits:
Deferred income taxes	207,418	198,885
Investment tax credit - deferred	48,304	44,836
Regulatory liabilities	155,067	154,298
Accrued pension and other postretirement benefits	72,388	73,085
Finance lease liabilities	16,941	17,322
Other deferred liabilities and other	95,572	92,152
Total Other Credits	595,690	580,578
Capitalization:
Common shareholders equity	833,143	803,807
Noncontrolling interest	145,681	148,587
Total Equity	978,824	952,394
Long-term debt	592,689	614,211
Total Capitalization	1,571,513	1,566,605
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	$ 2,327,884	$ 2,262,775