Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 26,374	$ 17,438
Accounts receivable, less reserves	50,167	46,205
Other accounts receivables, less reserves	15,244	16,094
Unbilled revenues	30,839	34,812
Materials and supplies, at average cost	30,951	29,863
Fuel for electric generation, at average cost	6,331	6,429
Stored natural gas, at average cost	5,580	15,668
Prepaid taxes	15,487	20,214
Regulatory assets - current	2,205	1,465
Other current assets	11,255	11,183
Total Current Assets	194,433	199,371
Other long-term receivables	691	1,155
Regulatory assets	108,271	107,547
Pension benefit asset	62,806	58,757
Other deferred assets and other	26,697	27,548
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,843,122	1,828,171
Construction work in progress	40,156	50,603
Total Property, Plant, and Equipment	1,883,278	1,878,774
Investments	101,365	98,754
Total Assets	2,377,541	2,371,906
Current Liabilities:
Long-term debt due within one year	4,920	4,889
Short-term debt	0	5,500
Accounts payable	44,690	64,149
Accrued interest and taxes	9,265	10,385
Accrued payroll related items	9,296	12,951
Regulatory liabilities - current	24,557	9,365
Derivative liabilities	130	2,140
Other current liabilities	5,246	8,468
Total Current Liabilities	98,104	117,847
Other Credits:
Deferred income taxes	233,146	231,149
Investment tax credit - deferred	48,773	44,836
Regulatory liabilities	155,096	154,298
Accrued pension and other postretirement benefits	72,881	73,085
Finance lease liabilities	16,920	17,322
Other deferred liabilities and other	91,363	91,690
Total Other Credits	618,179	612,380
Capitalization:
Common shareholders equity	1,048,153	1,027,468
Long-term debt	613,105	614,211
Total Capitalization	1,661,258	1,641,679
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	2,377,541	2,371,906
MGE [Member]
Current Assets:
Cash and cash equivalents	17,159	6,401
Accounts receivable, less reserves	50,167	46,205
Affiliate receivables	530	558
Other accounts receivables, less reserves	15,242	16,092
Unbilled revenues	30,839	34,812
Materials and supplies, at average cost	30,951	29,863
Fuel for electric generation, at average cost	6,331	6,429
Stored natural gas, at average cost	5,580	15,668
Prepaid taxes	15,193	19,379
Regulatory assets - current	2,205	1,465
Other current assets	11,152	11,071
Total Current Assets	185,349	187,943
Affiliate receivable long-term	1,456	1,589
Regulatory assets	108,271	107,547
Pension benefit asset	62,806	58,757
Other deferred assets and other	26,806	27,907
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,843,150	1,828,199
Construction work in progress	40,156	50,603
Total Property, Plant, and Equipment	1,883,306	1,878,802
Investments	177	230
Total Assets	2,268,171	2,262,775
Current Liabilities:
Long-term debt due within one year	4,920	4,889
Short-term debt	0	5,500
Accounts payable	44,672	64,130
Accrued interest and taxes	9,417	10,649
Accrued payroll related items	9,296	12,951
Regulatory liabilities - current	24,557	9,365
Derivative liabilities	130	2,140
Other current liabilities	5,324	5,968
Total Current Liabilities	98,316	115,592
Other Credits:
Deferred income taxes	200,507	198,885
Investment tax credit - deferred	48,773	44,836
Regulatory liabilities	155,096	154,298
Accrued pension and other postretirement benefits	72,881	73,085
Finance lease liabilities	16,920	17,322
Other deferred liabilities and other	92,126	92,152
Total Other Credits	586,303	580,578
Capitalization:
Common shareholders equity	826,104	803,807
Noncontrolling interest	144,343	148,587
Total Equity	970,447	952,394
Long-term debt	613,105	614,211
Total Capitalization	1,583,552	1,566,605
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	$ 2,268,171	$ 2,262,775