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Long-Term Debt (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt due within one year $ (4,266) $ (4,182)
Unamortized discount (228) (252)
Total Long-Term Debt 391,014 395,256
Long-Term Debt Maturities [Abstract]    
Long term debt maturities in 2016 4,266  
Long term debt maturities in 2017 34,358  
Long term debt maturities in 2018 24,452  
Long term debt maturities in 2019 4,553  
Long term debt maturities in 2020 19,659  
Long term debt maturities in future years 308,220  
Total 395,508  
First Mortgage Bonds [Member] | 7.70%, 2028 Series    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 1,200 $ 1,200
Interest rate [1] 7.70% 7.70%
Debt covenant, allowable amount available for payment of dividends $ 353,000  
Tax Exempt Debt [Member] | 3.45%, 2027 Series, Industrial Development Revenue Bonds    
Debt Instrument [Line Items]    
Long-term debt, gross $ 19,300 $ 19,300
Interest rate 3.45% 3.45%
Medium-Term Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 100,000 $ 100,000
Medium-Term Notes [Member] | 5.25%, due 2017    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 30,000 $ 30,000
Interest rate [2] 5.25% 5.25%
Medium-Term Notes [Member] | 6.12%, due 2028    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 20,000 $ 20,000
Interest rate [2] 6.12% 6.12%
Medium-Term Notes [Member] | 7.12%, due 2032    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 25,000 $ 25,000
Interest rate [2] 7.12% 7.12%
Medium-Term Notes [Member] | 6.247%, due 2037    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 25,000 $ 25,000
Interest rate [2] 6.247% 6.247%
Other Long-Term Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [3] $ 275,008 $ 279,190
Other Long-Term Debt [Member] | 5.59%, due 2018    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 20,000 $ 20,000
Interest rate [3],[4] 5.59% 5.59%
Other Long-Term Debt [Member] | 5.59%, due 2018 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 5.59%, due 2018 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 3.38%, due 2020    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 15,000 $ 15,000
Interest rate [3],[4] 3.38% 3.38%
Other Long-Term Debt [Member] | 3.38%, due 2020 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 3.38%, due 2020 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 3.09%, due 2023    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 30,000 $ 30,000
Interest rate [3],[4] 3.09% 3.09%
Other Long-Term Debt [Member] | 3.09%, due 2023 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 3.09%, due 2023 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 3.29%, due 2026    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 15,000 $ 15,000
Interest rate [3],[4] 3.29% 3.29%
Other Long-Term Debt [Member] | 3.29%, due 2026 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 3.29%, due 2026 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 5.68%, due 2033    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[5] $ 28,063 $ 28,954
Interest rate [3],[5] 5.68% 5.68%
Other Long-Term Debt [Member] | 5.19%, due 2033    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[5] $ 18,640 $ 19,264
Interest rate [3],[5] 5.19% 5.19%
Other Long-Term Debt [Member] | 5.26%, due 2040    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 15,000 $ 15,000
Interest rate [3],[4] 5.26% 5.26%
Other Long-Term Debt [Member] | 5.26%, due 2040 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 5.26%, due 2040 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 5.04%, due 2040    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[6] $ 40,138 $ 41,805
Interest rate [3],[6] 5.04% 5.04%
Other Long-Term Debt [Member] | 4.74%, due 2041    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[6] $ 25,167 $ 26,167
Interest rate [3],[6] 4.74% 4.74%
Other Long-Term Debt [Member] | 4.38%, due 2042    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 28,000 $ 28,000
Interest rate [3],[4] 4.38% 4.38%
Other Long-Term Debt [Member] | 4.38%, due 2042 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 4.38%, due 2042 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 4.42%, due 2043    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 20,000 $ 20,000
Interest rate [3],[4] 4.42% 4.42%
Other Long-Term Debt [Member] | 4.42%, due 2043 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 4.42%, due 2043 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
Other Long-Term Debt [Member] | 4.47%, due 2048    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 20,000 $ 20,000
Interest rate [3],[4] 4.47% 4.47%
Other Long-Term Debt [Member] | 4.47%, due 2048 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
Other Long-Term Debt [Member] | 4.47%, due 2048 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member]    
Debt Instrument [Line Items]    
Long-term debt due within one year $ (4,266) $ (4,182)
Unamortized discount (228) (252)
Total Long-Term Debt 391,014 395,256
Long-Term Debt Maturities [Abstract]    
Long term debt maturities in 2016 [7] 4,266  
Long term debt maturities in 2017 [7] 34,358  
Long term debt maturities in 2018 [7] 24,452  
Long term debt maturities in 2019 [7] 4,553  
Long term debt maturities in 2020 [7] 19,659  
Long term debt maturities in future years [7] 308,220  
Total [7] 395,508  
MGE [Member] | First Mortgage Bonds [Member] | 7.70%, 2028 Series    
Debt Instrument [Line Items]    
Long-term debt, gross [1] $ 1,200 $ 1,200
Interest rate [1] 7.70% 7.70%
Debt covenant, allowable amount available for payment of dividends $ 353,000  
MGE [Member] | Tax Exempt Debt [Member] | 3.45%, 2027 Series, Industrial Development Revenue Bonds    
Debt Instrument [Line Items]    
Long-term debt, gross $ 19,300 $ 19,300
Interest rate 3.45% 3.45%
MGE [Member] | Medium-Term Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 100,000 $ 100,000
MGE [Member] | Medium-Term Notes [Member] | 5.25%, due 2017    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 30,000 $ 30,000
Interest rate [2] 5.25% 5.25%
MGE [Member] | Medium-Term Notes [Member] | 6.12%, due 2028    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 20,000 $ 20,000
Interest rate [2] 6.12% 6.12%
MGE [Member] | Medium-Term Notes [Member] | 7.12%, due 2032    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 25,000 $ 25,000
Interest rate [2] 7.12% 7.12%
MGE [Member] | Medium-Term Notes [Member] | 6.247%, due 2037    
Debt Instrument [Line Items]    
Long-term debt, gross [2] $ 25,000 $ 25,000
Interest rate [2] 6.247% 6.247%
MGE [Member] | Other Long-Term Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross [3] $ 275,008 $ 279,190
MGE [Member] | Other Long-Term Debt [Member] | 5.59%, due 2018    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 20,000 $ 20,000
Interest rate [3],[4] 5.59% 5.59%
MGE [Member] | Other Long-Term Debt [Member] | 5.59%, due 2018 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 5.59%, due 2018 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 3.38%, due 2020    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 15,000 $ 15,000
Interest rate [3],[4] 3.38% 3.38%
MGE [Member] | Other Long-Term Debt [Member] | 3.38%, due 2020 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 3.38%, due 2020 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 3.09%, due 2023    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 30,000 $ 30,000
Interest rate [3],[4] 3.09% 3.09%
MGE [Member] | Other Long-Term Debt [Member] | 3.09%, due 2023 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 3.09%, due 2023 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 3.29%, due 2026    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 15,000 $ 15,000
Interest rate [3],[4] 3.29% 3.29%
MGE [Member] | Other Long-Term Debt [Member] | 3.29%, due 2026 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 3.29%, due 2026 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 5.68%, due 2033    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[5] $ 28,063 $ 28,954
Interest rate [3],[5] 5.68% 5.68%
MGE [Member] | Other Long-Term Debt [Member] | 5.19%, due 2033    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[5] $ 18,640 $ 19,264
Interest rate [3],[5] 5.19% 5.19%
MGE [Member] | Other Long-Term Debt [Member] | 5.26%, due 2040    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 15,000 $ 15,000
Interest rate [3],[4] 5.26% 5.26%
MGE [Member] | Other Long-Term Debt [Member] | 5.26%, due 2040 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 5.26%, due 2040 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 5.04%, due 2040    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[6] $ 40,138 $ 41,805
Interest rate [3],[6] 5.04% 5.04%
MGE [Member] | Other Long-Term Debt [Member] | 4.74%, due 2041    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[6] $ 25,167 $ 26,167
Interest rate [3],[6] 4.74% 4.74%
MGE [Member] | Other Long-Term Debt [Member] | 4.38%, due 2042    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 28,000 $ 28,000
Interest rate [3],[4] 4.38% 4.38%
MGE [Member] | Other Long-Term Debt [Member] | 4.38%, due 2042 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 4.38%, due 2042 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 4.42%, due 2043    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 20,000 $ 20,000
Interest rate [3],[4] 4.42% 4.42%
MGE [Member] | Other Long-Term Debt [Member] | 4.42%, due 2043 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 4.42%, due 2043 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE [Member] | Other Long-Term Debt [Member] | 4.47%, due 2048    
Debt Instrument [Line Items]    
Long-term debt, gross [3],[4] $ 20,000 $ 20,000
Interest rate [3],[4] 4.47% 4.47%
MGE [Member] | Other Long-Term Debt [Member] | 4.47%, due 2048 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value 30.00%  
MGE [Member] | Other Long-Term Debt [Member] | 4.47%, due 2048 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
Priority debt to assets ratio 0.2  
MGE Power Elm Road [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 65,305 $ 67,972
MGE Power Elm Road [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt service coverage ratio 1.25  
MGE Power Elm Road [Member] | Other Long-Term Debt [Member] | 5.04%, due 2040 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt service coverage ratio 1.25  
MGE Power Elm Road [Member] | Other Long-Term Debt [Member] | 4.74%, due 2041 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt service coverage ratio 1.25  
MGE Power West Campus [Member]    
Debt Instrument [Line Items]    
Long-term debt, gross $ 46,703 $ 48,218
MGE Power West Campus [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Debt service coverage ratio 1.25  
MGE Power West Campus [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
MGE Power West Campus [Member] | Other Long-Term Debt [Member] | 5.68%, due 2033 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt service coverage ratio 1.25  
MGE Power West Campus [Member] | Other Long-Term Debt [Member] | 5.68%, due 2033 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
MGE Power West Campus [Member] | Other Long-Term Debt [Member] | 5.19%, due 2033 | Minimum [Member]    
Debt Instrument [Line Items]    
Debt service coverage ratio 1.25  
MGE Power West Campus [Member] | Other Long-Term Debt [Member] | 5.19%, due 2033 | Maximum [Member]    
Debt Instrument [Line Items]    
Debt to total capitalization ratio 0.65  
[1] MGE's utility plant is subject to the lien of its Indenture of Mortgage and Deed of Trust, under which its first mortgage bonds are issued. The Mortgage Indenture provides that dividends or any other distribution or purchase of shares may not be made if the aggregate amount thereof since December 31, 1945 would exceed the earned surplus (retained earnings) accumulated subsequent to December 31, 1945. As of December 31, 2015 , approximately $ 353.0 million was available for the payment of dividends under this covenant.
[2] T he indenture under which MGE's Medium-T erm notes are issued provides that those notes will be entitled to be equally and ratably secured in the event that MGE issues any additional first mortgage bonds.
[3] Unsecured notes issued pursuant to various Note Purchase Agreements with one or more purchasers. The notes are not issued under, or governed by, MGE ' s Indenture dated as of September 1, 1998, which governs MGE ' s Medium-Term Notes.
[4] Issued by MGE. Under that Note Purchase Agreement: ( i ) note holders have the right to require MGE to repurchase their notes at par in the event of an acquisition of beneficial ownership of 30 % or more of the outstanding v oting stock of MGE Energy, (ii) MGE must maintain a ratio of its consolidated indebtedness to consolidated total capitalization not to exceed a maximum of 65 % , and (iii) MGE cannot issue "Priority Debt" in an amount exceeding 20 % of its consolidated assets. Priority Debt is defined as any indebtedness of MGE secured by liens other than specified liens permitted by the Note Purchase Agreement and certain unsecured indebtedness of certain subsidiarie s. As of December 31, 2015 , MGE was in compliance with the covenant requirements.
[5] Issued by MGE Power West Campus. The Note Purchase Agreements require it to maintain a projected debt service coverage ratio of not less than 1.25 to 1.00 , and debt to total capitalization ratio of not more tha n 0.65 to 1.00 . The notes are secured by a collateral assignment of lease payments th at MGE is making to MGE Power West Campus for use of its ownership interest in the West Campus Cogeneration Facility pursuant to a long-term lease. As of December 31, 2015 , MGE Power West Campus was in compliance with the covenant requirements.
[6] Issued by MGE Power Elm Road. The Note Purchase Agreement requires MGE Power Elm Road to maintain a projected and actual debt service coverage ratio at the end of any calendar quarter of not less than 1.25 to 1.00 for the trailing 12-month period. The notes are secured by a collateral assignment of lease payments that MGE is making to MGE Power Elm Road for use of its ownership interest in the Elm Road Units pursuant to long-term lease s . As of December 31, 2015 , MGE Power Elm Road was in compliance with the covenant requirements.
[7] Includes $ 46.7 million for MGE Power West Campus and $ 65.3 million for MGE Power Elm Road, all of which are consolidated wi th MGE's debt (see Footnote 2 for further information) .