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Long-Term Debt (Details) (USD $) | 12 Months Ended |  |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 First Mortgage Bonds [Member] 7.70%, 2028 Series | Dec. 31, 2012 First Mortgage Bonds [Member] 7.70%, 2028 Series | Dec. 31, 2013 Tax Exempt Debt [Member] 3.45%, 2027 Series, Industrial Development Revenue Bonds | Dec. 31, 2012 Tax Exempt Debt [Member] 3.45%, 2027 Series, Industrial Development Revenue Bonds | Dec. 31, 2013 Medium-Term Notes [Member] | Dec. 31, 2012 Medium-Term Notes [Member] | Jul. 18, 2013 Medium-Term Notes [Member] 5.26%, due 2017 | Dec. 31, 2013 Medium-Term Notes [Member] 5.26%, due 2017 | Dec. 31, 2012 Medium-Term Notes [Member] 5.26%, due 2017 | Dec. 31, 2013 Medium-Term Notes [Member] 5.25%, due 2017 | Dec. 31, 2012 Medium-Term Notes [Member] 5.25%, due 2017 | Dec. 31, 2013 Medium-Term Notes [Member] 6.12%, due 2028 | Dec. 31, 2012 Medium-Term Notes [Member] 6.12%, due 2028 | Dec. 31, 2013 Medium-Term Notes [Member] 7.12%, due 2032 | Dec. 31, 2012 Medium-Term Notes [Member] 7.12%, due 2032 | Dec. 31, 2013 Medium-Term Notes [Member] 6.247%, due 2037 | Dec. 31, 2012 Medium-Term Notes [Member] 6.247%, due 2037 | Dec. 31, 2013 Other Long-Term Debt [Member] | Dec. 31, 2012 Other Long-Term Debt [Member] | Jul. 18, 2013 Other Long-Term Debt [Member] 5.59%, due 2018 | Dec. 31, 2013 Other Long-Term Debt [Member] 5.59%, due 2018 | Dec. 31, 2012 Other Long-Term Debt [Member] 5.59%, due 2018 | Dec. 31, 2013 Other Long-Term Debt [Member] 5.59%, due 2018 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 5.59%, due 2018 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 3.38%, due 2020 | Dec. 31, 2012 Other Long-Term Debt [Member] 3.38%, due 2020 | Dec. 31, 2013 Other Long-Term Debt [Member] 3.38%, due 2020 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 3.38%, due 2020 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 3.09%, due 2023 | Dec. 31, 2012 Other Long-Term Debt [Member] 3.09%, due 2023 | Dec. 31, 2013 Other Long-Term Debt [Member] 3.09%, due 2023 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 3.09%, due 2023 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 3.29%, due 2026 | Dec. 31, 2012 Other Long-Term Debt [Member] 3.29%, due 2026 | Dec. 31, 2013 Other Long-Term Debt [Member] 3.29%, due 2026 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 3.29%, due 2026 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 5.68%, due 2033 | Dec. 31, 2012 Other Long-Term Debt [Member] 5.68%, due 2033 | Dec. 31, 2013 Other Long-Term Debt [Member] 5.19%, due 2033 | Dec. 31, 2012 Other Long-Term Debt [Member] 5.19%, due 2033 | Dec. 31, 2013 Other Long-Term Debt [Member] 5.26%, due 2040 | Dec. 31, 2012 Other Long-Term Debt [Member] 5.26%, due 2040 | Dec. 31, 2013 Other Long-Term Debt [Member] 5.26%, due 2040 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 5.26%, due 2040 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 5.04%, due 2040 | Dec. 31, 2012 Other Long-Term Debt [Member] 5.04%, due 2040 | Dec. 31, 2013 Other Long-Term Debt [Member] 4.74%, due 2041 | Dec. 31, 2012 Other Long-Term Debt [Member] 4.74%, due 2041 | Dec. 31, 2013 Other Long-Term Debt [Member] 4.38%, due 2042 | Dec. 31, 2012 Other Long-Term Debt [Member] 4.38%, due 2042 | Dec. 31, 2013 Other Long-Term Debt [Member] 4.38%, due 2042 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 4.38%, due 2042 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 4.42%, due 2043 | Dec. 31, 2012 Other Long-Term Debt [Member] 4.42%, due 2043 | Dec. 31, 2013 Other Long-Term Debt [Member] 4.42%, due 2043 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 4.42%, due 2043 Maximum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 4.47%, due 2048 | Dec. 31, 2012 Other Long-Term Debt [Member] 4.47%, due 2048 | Dec. 31, 2013 Other Long-Term Debt [Member] 4.47%, due 2048 Minimum [Member] | Dec. 31, 2013 Other Long-Term Debt [Member] 4.47%, due 2048 Maximum [Member] | Dec. 31, 2013 MGE [Member] | Dec. 31, 2012 MGE [Member] | Dec. 31, 2011 MGE [Member] | Dec. 31, 2013 MGE [Member] First Mortgage Bonds [Member] 7.70%, 2028 Series | Dec. 31, 2012 MGE [Member] First Mortgage Bonds [Member] 7.70%, 2028 Series | Dec. 31, 2013 MGE [Member] Tax Exempt Debt [Member] 3.45%, 2027 Series, Industrial Development Revenue Bonds | Dec. 31, 2012 MGE [Member] Tax Exempt Debt [Member] 3.45%, 2027 Series, Industrial Development Revenue Bonds | Dec. 31, 2013 MGE [Member] Medium-Term Notes [Member] | Dec. 31, 2012 MGE [Member] Medium-Term Notes [Member] | Jul. 18, 2013 MGE [Member] Medium-Term Notes [Member] 5.26%, due 2017 | Dec. 31, 2013 MGE [Member] Medium-Term Notes [Member] 5.26%, due 2017 | Dec. 31, 2012 MGE [Member] Medium-Term Notes [Member] 5.26%, due 2017 | Dec. 31, 2013 MGE [Member] Medium-Term Notes [Member] 5.25%, due 2017 | Dec. 31, 2012 MGE [Member] Medium-Term Notes [Member] 5.25%, due 2017 | Dec. 31, 2013 MGE [Member] Medium-Term Notes [Member] 6.12%, due 2028 | Dec. 31, 2012 MGE [Member] Medium-Term Notes [Member] 6.12%, due 2028 | Dec. 31, 2013 MGE [Member] Medium-Term Notes [Member] 7.12%, due 2032 | Dec. 31, 2012 MGE [Member] Medium-Term Notes [Member] 7.12%, due 2032 | Dec. 31, 2013 MGE [Member] Medium-Term Notes [Member] 6.247%, due 2037 | Dec. 31, 2012 MGE [Member] Medium-Term Notes [Member] 6.247%, due 2037 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] | Jul. 18, 2013 MGE [Member] Other Long-Term Debt [Member] 5.59%, due 2018 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.59%, due 2018 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 5.59%, due 2018 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.59%, due 2018 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.59%, due 2018 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.38%, due 2020 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 3.38%, due 2020 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.38%, due 2020 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.38%, due 2020 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.09%, due 2023 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 3.09%, due 2023 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.09%, due 2023 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.09%, due 2023 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.29%, due 2026 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 3.29%, due 2026 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.29%, due 2026 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 3.29%, due 2026 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.68%, due 2033 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 5.68%, due 2033 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.19%, due 2033 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 5.19%, due 2033 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.26%, due 2040 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 5.26%, due 2040 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.26%, due 2040 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.26%, due 2040 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 5.04%, due 2040 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 5.04%, due 2040 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.74%, due 2041 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 4.74%, due 2041 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.38%, due 2042 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 4.38%, due 2042 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.38%, due 2042 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.38%, due 2042 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.42%, due 2043 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 4.42%, due 2043 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.42%, due 2043 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.42%, due 2043 Maximum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.47%, due 2048 | Dec. 31, 2012 MGE [Member] Other Long-Term Debt [Member] 4.47%, due 2048 | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.47%, due 2048 Minimum [Member] | Dec. 31, 2013 MGE [Member] Other Long-Term Debt [Member] 4.47%, due 2048 Maximum [Member] | Dec. 31, 2013 MGE Power Elm Road [Member] | Dec. 31, 2012 MGE Power Elm Road [Member] | Dec. 31, 2013 MGE Power Elm Road [Member] Minimum [Member] | Dec. 31, 2013 MGE Power Elm Road [Member] Other Long-Term Debt [Member] 5.04%, due 2040 Minimum [Member] | Dec. 31, 2013 MGE Power Elm Road [Member] Other Long-Term Debt [Member] 4.74%, due 2041 Minimum [Member] | Dec. 31, 2013 MGE Power West Campus [Member] | Dec. 31, 2012 MGE Power West Campus [Member] | Dec. 31, 2013 MGE Power West Campus [Member] Minimum [Member] | Dec. 31, 2013 MGE Power West Campus [Member] Maximum [Member] | Dec. 31, 2013 MGE Power West Campus [Member] Other Long-Term Debt [Member] 5.68%, due 2033 Minimum [Member] | Dec. 31, 2013 MGE Power West Campus [Member] Other Long-Term Debt [Member] 5.68%, due 2033 Maximum [Member] | Dec. 31, 2013 MGE Power West Campus [Member] Other Long-Term Debt [Member] 5.19%, due 2033 Minimum [Member] | Dec. 31, 2013 MGE Power West Campus [Member] Other Long-Term Debt [Member] 5.19%, due 2033 Maximum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 1,200,000 | [1] | $ 1,200,000 | [1] | $ 19,300,000 | $ 19,300,000 | $ 100,000,000 | [2] | $ 120,000,000 | [2] |  | $ 0 | [2],[3] | $ 20,000,000 | [2],[3] | $ 30,000,000 | [2] | $ 30,000,000 | [2] | $ 20,000,000 | [2] | $ 20,000,000 | [2] | $ 25,000,000 | [2] | $ 25,000,000 | [2] | $ 25,000,000 | [2] | $ 25,000,000 | [2] | $ 283,293,000 | [4] | $ 221,305,000 | [4] |  | $ 20,000,000 | [3],[4],[5] | $ 40,000,000 | [3],[4],[5] |  |  | $ 15,000,000 | [4],[5] | $ 15,000,000 | [4],[5] |  |  | $ 30,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 15,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 29,797,000 | [4],[6] | $ 30,000,000 | [4],[6] | $ 19,857,000 | [4],[6] | $ 20,000,000 | [4],[6] | $ 15,000,000 | [4],[5] | $ 15,000,000 | [4],[5] |  |  | $ 43,472,000 | [4],[7] | $ 45,138,000 | [4],[7] | $ 27,167,000 | [4],[7] | $ 28,167,000 | [4],[7] | $ 28,000,000 | [4],[5] | $ 28,000,000 | [4],[5] |  |  | $ 20,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 20,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  |  |  |  |  | $ 1,200,000 | [1] | $ 1,200,000 | [1] | $ 19,300,000 | $ 19,300,000 | $ 100,000,000 | [2] | $ 120,000,000 | [2] |  | $ 0 | [2],[3] | $ 20,000,000 | [2],[3] | $ 30,000,000 | [2] | $ 30,000,000 | [2] | $ 20,000,000 | [2] | $ 20,000,000 | [2] | $ 25,000,000 | [2] | $ 25,000,000 | [2] | $ 25,000,000 | [2] | $ 25,000,000 | [2] | $ 283,293,000 | [4] | $ 221,305,000 | [4] |  | $ 20,000,000 | [3],[4],[5] | $ 40,000,000 | [3],[4],[5] |  |  | $ 15,000,000 | [4],[5] | $ 15,000,000 | [4],[5] |  |  | $ 30,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 15,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 29,797,000 | [4],[6] | $ 30,000,000 | [4],[6] | $ 19,857,000 | [4],[6] | $ 20,000,000 | [4],[6] | $ 15,000,000 | [4],[5] | $ 15,000,000 | [4],[5] |  |  | $ 43,472,000 | [4],[7] | $ 45,138,000 | [4],[7] | $ 27,167,000 | [4],[7] | $ 28,167,000 | [4],[7] | $ 28,000,000 | [4],[5] | $ 28,000,000 | [4],[5] |  |  | $ 20,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 20,000,000 | [3],[4],[5] | $ 0 | [3],[4],[5] |  |  | $ 70,639,000 | $ 73,306,000 |  |  |  | $ 49,653,000 | $ 50,000,000 |  |  |  |  |  |
Long-term debt due within one year | (4,102,000) | (3,013,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,102,000) |  | (3,013,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount | (277,000) | (301,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (277,000) |  | (301,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Long-Term Debt | 399,414,000 | 358,491,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 399,414,000 |  | 358,491,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 7.70% |  | 7.70% |  | 3.45% | 3.45% |  |  |  |  |  | 5.26% |  | 5.26% |  | 5.25% |  | 5.25% |  | 6.12% |  | 6.12% |  | 7.12% |  | 7.12% |  | 6.247% |  | 6.247% |  |  |  |  |  |  | 5.59% |  | 5.59% |  |  |  | 3.38% |  | 3.38% |  |  |  | 3.09% |  | 0.00% |  |  |  | 3.29% |  | 0.00% |  |  |  | 5.68% |  | 5.68% |  | 5.19% |  | 5.19% |  | 5.26% |  | 5.26% |  |  |  | 5.04% |  | 5.04% |  | 4.74% |  | 4.74% |  | 4.38% |  | 4.38% |  |  |  | 4.42% |  | 0.00% |  |  |  | 4.47% |  | 0.00% |  |  |  |  |  |  |  | 7.70% |  | 7.70% |  | 3.45% | 3.45% |  |  |  |  |  | 5.26% |  | 5.26% |  | 5.25% |  | 5.25% |  | 6.12% |  | 6.12% |  | 7.12% |  | 7.12% |  | 6.247% |  | 6.247% |  |  |  |  |  |  | 5.59% |  | 5.59% |  |  |  | 3.38% |  | 3.38% |  |  |  | 3.09% |  | 0.00% |  |  |  | 3.29% |  | 0.00% |  |  |  | 5.68% |  | 5.68% |  | 5.19% |  | 5.19% |  | 5.26% |  | 5.26% |  |  |  | 5.04% |  | 5.04% |  | 4.74% |  | 4.74% |  | 4.38% |  | 4.38% |  |  |  | 4.42% |  | 0.00% |  |  |  | 4.47% |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, allowable amount available for payment of dividends |  |  |  | 305,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 305,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debt, amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt make-whole premium | 6,757,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,757,000 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, ownership interest by outside party resulting in repurchase of notes at par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to total capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  | 0.65 |  |  |  |  |  |  |  |  | 0.65 |  | 0.65 |  | 0.65
Priority debt to assets ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  | 0.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25 | 1.25 | 1.25 |  |  | 1.25 |  | 1.25 |  | 1.25 |
Long-Term Debt Maturities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities in 2014 | 4,102,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,102,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities in 2015 | 4,182,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,182,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities in 2016 | 4,268,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,268,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities in 2017 | 34,358,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,358,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities in 2018 | 24,452,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,452,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt maturities in future years | 332,431,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 332,431,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 403,793,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 403,793,000 | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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, 2013, approximately $305.6 million was available for the payment of dividends under this covenant.
[2] | The indenture under which MGE's Medium-Term 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] | On July 18, 2013, MGE issued $20 million in principal amount of 4.42% senior notes, Series A, due July 15, 2043 and $20 million in principal amount of 4.47% senior notes, Series B, due July 15, 2048. MGE used the net proceeds from the sale of the Notes to redeem on July 18, 2013, $20 million of its 5.26% Medium-Term Notes due September 29, 2017, and to make a $20 million partial redemption of its 5.59% Senior Notes due September 11, 2018. MGE paid a redemption price equal to the principal amount of the notes that were redeemed, plus accrued interest to the redemption date, plus a make-whole premium equal to $3.2 million and $3.6 million, for the 5.26% Medium-Term Notes due September 29, 2017 and 5.59% Senior Notes due September 11, 2018, respectively. The make-whole premiums are treated as a regulatory asset and will be amortized over the life of the Series A and Series B Notes. Any interest savings in 2013 will be deferred. There is $20 million principal amount of the 5.59% Senior Notes remaining outstanding after the redemption. The Note Purchase Agreement under which the Series A and Series B Notes were issued also included the issuance on September 16, 2013, of $30 million in principal amount of 3.09% Senior Notes, Series C, due September 15, 2023 and $15 million of 3.29% Senior Notes, Series D, due September 15, 2026. The Series C Notes and the Series D Notes carry interest rates of 3.09% per annum and 3.29% per annum, respectively. The proceeds of the Notes were used and are expected to continue to be used to help finance the Columbia environmental project.
[4] | 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.
[5] | 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 voting 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 subsidiaries. As of December 31, 2013, MGE is in compliance with the covenant requirements.
[6] | 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 than .65 to 1.00. The notes are secured by a collateral assignment of lease payments that 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, 2013, MGE Power West Campus is in compliance with the covenant requirements.
[7] | 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 leases. As of December 31, 2013, MGE Power Elm Road is in compliance with the covenant requirements.
[8] | Includes $29.8 million and $19.9 million for MGE Power West Campus, and $43.5 million and $27.2 million for MGE Power Elm Road, all of which are consolidated with MGE's debt (see Footnote 2 for further information).

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