Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 75,791	$ 65,755
Accounts receivable, less reserves	34,599	41,614
Other accounts receivables, less reserves	6,030	7,610
Unbilled revenues	23,159	31,262
Materials and supplies, at average cost	19,696	17,121
Fossil fuel	15,446	8,098
Stored natural gas, at average cost	12,712	21,036
Prepaid taxes	24,656	38,910
Regulatory assets - current	7,850	8,360
Deferred income taxes - current	0	3,482
Other current assets	10,895	10,711
Total Current Assets	230,834	253,959
Regulatory assets	156,139	156,823
Other deferred assets and other	9,723	7,018
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,193,965	1,189,077
Construction work in progress	29,204	19,029
Total Property, Plant, and Equipment	1,223,169	1,208,106
Investments	73,363	71,760
Total Assets	1,693,228	1,697,666
Current Liabilities:
Long-term debt due within one year	4,224	4,182
Short-term debt	0	7,000
Accounts payable	34,555	41,655
Accrued interest and taxes	4,905	5,086
Accrued payroll related items	8,733	11,241
Deferred income taxes	907	0
Regulatory liabilities - current	6,282	0
Derivative liabilities	7,863	6,901
Other current liabilities	8,682	13,931
Total Current Liabilities	76,151	89,996
Other Credits:
Deferred income taxes	343,942	342,045
Investment tax credit - deferred	1,136	1,223
Regulatory liabilities	21,542	22,715
Accrued pension and other postretirement benefits	79,324	90,201
Derivative liabilities	48,090	46,560
Other deferred liabilities and other	58,565	50,269
Total Other Credits	552,599	553,013
Capitalization:
Common shareholders equity	671,332	659,401
Long-term debt	393,146	395,256
Total Capitalization	$ 1,064,478	$ 1,054,657
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	$ 1,693,228	$ 1,697,666
MGE [Member]
Current Assets:
Cash and cash equivalents	23,323	4,562
Accounts receivable, less reserves	34,599	41,614
Affiliate receivables	583	7,112
Other accounts receivables, less reserves	5,980	7,524
Unbilled revenues	23,159	31,262
Materials and supplies, at average cost	19,696	17,121
Fossil fuel	15,446	8,098
Stored natural gas, at average cost	12,712	21,035
Prepaid taxes	25,638	39,103
Regulatory assets - current	7,850	8,360
Deferred income taxes - current	0	1,271
Other current assets	10,887	10,683
Total Current Assets	179,873	197,745
Affiliate receivable long-term	5,031	5,295
Regulatory assets	156,139	156,823
Other deferred assets and other	7,599	4,977
Property, Plant, and Equipment:
Property, plant, and equipment, net	1,193,262	1,188,351
Construction work in progress	29,204	19,029
Total Property, Plant, and Equipment	1,222,466	1,207,380
Investments	69,846	68,402
Total Assets	1,640,954	1,640,622
Current Liabilities:
Long-term debt due within one year	4,224	4,182
Short-term debt	0	7,000
Accounts payable	34,542	41,654
Accrued interest and taxes	4,860	5,039
Accrued payroll related items	8,733	11,241
Deferred income taxes	1,151	0
Regulatory liabilities - current	6,282	0
Derivative liabilities	7,863	6,901
Other current liabilities	8,531	11,350
Total Current Liabilities	76,186	87,367
Other Credits:
Deferred income taxes	336,336	334,773
Investment tax credit - deferred	1,136	1,223
Regulatory liabilities	21,542	22,715
Accrued pension and other postretirement benefits	79,324	90,201
Derivative liabilities	48,090	46,560
Other deferred liabilities and other	58,565	50,267
Total Other Credits	544,993	545,739
Capitalization:
Common shareholders equity	494,970	486,571
Noncontrolling interest	131,659	125,689
Total Equity	626,629	612,260
Long-term debt	393,146	395,256
Total Capitalization	$ 1,019,775	$ 1,007,516
Commitments and contingencies (see Footnote 8)
Total Liabilities and Capitalization	$ 1,640,954	$ 1,640,622