Madison Gas and Electric Company Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Revenues:
Regulated electric revenues		$ 412,528	$ 394,849	$ 403,957
Regulated gas revenues		143,737	221,720	181,462
Nonregulated revenues		7,763	3,283	5,468
Total Operating Revenues		564,028	619,852	590,887
Operating Expenses:
Fuel for electric generation		53,858	42,828	46,062
Purchased power		81,224	73,232	80,830
Cost of gas sold		76,109	143,644	107,315
Other operations and maintenance		164,478	161,703	171,248
Depreciation and amortization		44,225	40,695	38,838
Other general taxes		19,879	19,652	18,607
Total Operating Expenses		439,773	481,754	462,900
Operating Income (Loss)		124,255	138,098	127,987
Other Income and Deductions:
Equity in earnings in ATC		7,728	9,150	9,434
Total Other Income and Deductions		8,613	10,079	10,701
Interest Expense:
Net Interest Expense		20,162	19,673	18,924
Net Income		71,343	80,319	74,905
MGE [Member]
Operating Revenues:
Regulated electric revenues		412,550	394,871	403,980
Regulated gas revenues		143,752	221,741	181,477
Nonregulated revenues		7,763	3,283	5,468
Total Operating Revenues		564,065	619,895	590,925
Operating Expenses:
Fuel for electric generation		53,866	42,836	46,070
Purchased power		81,237	73,245	80,844
Cost of gas sold		76,124	143,665	107,330
Other operations and maintenance		163,622	160,831	170,498
Depreciation and amortization		44,178	40,648	38,834
Other general taxes		19,879	19,652	18,607
Income tax provision		38,159	45,090	41,519
Total Operating Expenses		477,065	525,967	503,702
Operating Income (Loss)	[1]	87,000	93,928	87,223
Other Income and Deductions:
AFUDC - equity funds		712	3,466	3,140
Equity in earnings in ATC		7,728	9,150	9,434
Income tax provision		(3,247)	(4,055)	(4,303)
Other deductions, net		(345)	(704)	(18)
Total Other Income and Deductions	[1]	4,848	7,857	8,253
Income before interest expense		91,848	101,785	95,476
Interest Expense:
Interest on long-term debt		20,520	20,927	20,087
Other interest, net		94	62	(21)
AFUDC - borrowed funds		(231)	(1,142)	(1,035)
Net Interest Expense		20,383	19,847	19,031
Net Income Including Noncontrolling Interest		71,465	81,938	76,445
Less Net Income Attributable to Noncontrolling Interest, net of tax		(26,097)	(26,310)	(27,438)
Net Income		$ 45,368	$ 55,628	$ 49,007

[1] *Amounts are shown net of the related tax expense, consistent with the presentation on the MGE Consolidated Statements of Income.