Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 53,058	$ 23,481
Accounts receivable, less reserves	39,177	40,482
Other accounts receivables, less reserves	9,828	7,940
Unbilled revenues	20,029	25,899
Materials and supplies, at average cost	33,608	26,287
Fuel for electric generation, at average cost	5,793	8,358
Stored natural gas, at average cost	10,022	10,637
Prepaid taxes	11,759	16,892
Regulatory assets - current	7,845	11,432
Other current assets	8,814	10,233
Total Current Assets	199,933	181,641
Other long-term receivables	1,662	1,811
Regulatory assets	126,929	134,314
Pension benefit asset	21,848	13,630
Other deferred assets and other	18,087	19,093
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,536,567	1,530,199
Construction work in progress	197,594	112,484
Total Property, Plant, and Equipment	1,734,161	1,642,683
Investments	93,106	88,492
Total Assets	2,195,726	2,081,664
Current Liabilities:
Long-term debt due within one year	19,742	19,659
Accounts payable	56,054	55,161
Accrued interest and taxes	5,789	7,244
Accrued payroll related items	11,625	12,752
Regulatory liabilities - current	3,585	9,228
Derivative liabilities	9,640	10,100
Other current liabilities	9,045	14,676
Total Current Liabilities	115,480	128,820
Other Credits:
Deferred income taxes	253,411	243,302
Investment tax credit - deferred	2,692	763
Regulatory liabilities	171,637	164,965
Accrued pension and other postretirement benefits	68,632	68,665
Derivative liabilities	6,340	15,340
Finance lease liabilities	17,795	17,379
Other deferred liabilities and other	65,772	63,013
Total Other Credits	586,279	573,427
Capitalization:
Common shareholders equity	973,584	855,676
Long-term debt	520,383	523,741
Total Capitalization	1,493,967	1,379,417
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	2,195,726	2,081,664
MGE [Member]
Current Assets:
Cash and cash equivalents	5,171	3,196
Accounts receivable, less reserves	39,177	40,482
Affiliate receivables	530	530
Other accounts receivables, less reserves	9,824	7,936
Unbilled revenues	20,029	25,899
Materials and supplies, at average cost	33,608	26,287
Fuel for electric generation, at average cost	5,793	8,358
Stored natural gas, at average cost	10,022	10,637
Prepaid taxes	12,373	15,463
Regulatory assets - current	7,845	11,432
Other current assets	8,746	10,065
Total Current Assets	153,118	160,285
Affiliate receivable long-term	2,251	2,648
Regulatory assets	126,929	134,314
Pension benefit asset	21,848	13,630
Other deferred assets and other	18,509	19,680
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,536,595	1,530,227
Construction work in progress	197,594	112,484
Total Property, Plant, and Equipment	1,734,189	1,642,711
Investments	461	209
Total Assets	2,057,305	1,973,477
Current Liabilities:
Long-term debt due within one year	19,742	19,659
Accounts payable	56,035	54,845
Accrued interest and taxes	8,602	8,754
Accrued payroll related items	11,625	12,752
Regulatory liabilities - current	3,585	9,228
Derivative liabilities	9,640	10,100
Other current liabilities	9,048	12,683
Total Current Liabilities	118,277	128,021
Other Credits:
Deferred income taxes	223,021	214,041
Investment tax credit - deferred	2,692	763
Regulatory liabilities	171,637	164,965
Accrued pension and other postretirement benefits	68,632	68,665
Derivative liabilities	6,340	15,340
Finance lease liabilities	17,795	17,379
Other deferred liabilities and other	65,748	62,973
Total Other Credits	555,865	544,126
Capitalization:
Common shareholders equity	721,723	637,286
Noncontrolling interest	141,057	140,303
Total Equity	862,780	777,589
Long-term debt	520,383	523,741
Total Capitalization	1,383,163	1,301,330
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	$ 2,057,305	$ 1,973,477