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Long-Term Debt | 12 Months Ended
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Dec. 31, 2013
Debt Disclosure [Abstract] |
Long-Term Debt | Long-Term Debt - MGE Energy and MGE. a. Long-Term Debt.
|  |  | 2013 |  |  | 2012 |
| (In thousands) |  | MGE Energy |  | MGE |  |  | MGE Energy |  | MGE |
| First Mortgage Bonds: (a) |  |  |  |  |  |  |  |  |  |
| 7.70%, 2028 Series | $ | 1,200 | $ | 1,200 |  | $ | 1,200 | $ | 1,200 |
| Tax Exempt Debt: |  |  |  |  |  |  |  |  |  |
| 3.45%, 2027 Series, |  |  |  |  |  |  |  |  |  |
| Industrial Development Revenue Bonds |  | 19,300 |  | 19,300 |  |  | 19,300 |  | 19,300 |
| Medium-Term Notes: (b) |  |  |  |  |  |  |  |  |  |
| 5.26%, due 2017 (d) |  | 0 |  | 0 |  |  | 20,000 |  | 20,000 |
| 5.25%, due 2017 |  | 30,000 |  | 30,000 |  |  | 30,000 |  | 30,000 |
| 6.12%, due 2028 |  | 20,000 |  | 20,000 |  |  | 20,000 |  | 20,000 |
| 7.12%, due 2032 |  | 25,000 |  | 25,000 |  |  | 25,000 |  | 25,000 |
| 6.247%, due 2037 |  | 25,000 |  | 25,000 |  |  | 25,000 |  | 25,000 |
| Total Medium-Term Notes |  | 100,000 |  | 100,000 |  |  | 120,000 |  | 120,000 |
| Other Long-Term Debt: (c) |  |  |  |  |  |  |  |  |  |
| 5.59%, due 2018 (d), (e) |  | 20,000 |  | 20,000 |  |  | 40,000 |  | 40,000 |
| 3.38%, due 2020 (e) |  | 15,000 |  | 15,000 |  |  | 15,000 |  | 15,000 |
| 3.09%, due 2023 (d), (e) |  | 30,000 |  | 30,000 |  |  | 0 |  | 0 |
| 3.29%, due 2026 (d), (e) |  | 15,000 |  | 15,000 |  |  | 0 |  | 0 |
| 5.68%, due 2033 (f) |  | 29,797 |  | 29,797 |  |  | 30,000 |  | 30,000 |
| 5.19%, due 2033 (f) |  | 19,857 |  | 19,857 |  |  | 20,000 |  | 20,000 |
| 5.26%, due 2040 (e) |  | 15,000 |  | 15,000 |  |  | 15,000 |  | 15,000 |
| 5.04%, due 2040 (g) |  | 43,472 |  | 43,472 |  |  | 45,138 |  | 45,138 |
| 4.74%, due 2041 (g) |  | 27,167 |  | 27,167 |  |  | 28,167 |  | 28,167 |
| 4.38%, due 2042 (e) |  | 28,000 |  | 28,000 |  |  | 28,000 |  | 28,000 |
| 4.42%, due 2043 (d), (e) |  | 20,000 |  | 20,000 |  |  | 0 |  | 0 |
| 4.47%, due 2048 (d), (e) |  | 20,000 |  | 20,000 |  |  | 0 |  | 0 |
| Total Other Long-Term Debt |  | 283,293 |  | 283,293 |  |  | 221,305 |  | 221,305 |
| Long-term debt due within one year |  | (4,102) |  | (4,102) |  |  | (3,013) |  | (3,013) |
| Unamortized discount |  | (277) |  | (277) |  |  | (301) |  | (301) |
| Total Long-Term Debt | $ | 399,414 | $ | 399,414 |  | $ | 358,491 | $ | 358,491 |
(a) 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. (b) 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. (c) 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. (d) 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 1 6, 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. (e) 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. (f) 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 .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. (g) 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, 2013, MGE Power Elm Road is in compliance with the covenant requirements. b. Long-Term Debt Maturities. Below is MGE Energy's and MGE's aggregate maturities for all long-term debt for years following the December 31, 2013, consolidated balance sheet s.
|  |  | MGE |  |  |
| (In thousands) |  | Energy |  | MGE * |
| 2014 | $ | 4,102 | $ | 4,102 |
| 2015 |  | 4,182 |  | 4,182 |
| 2016 |  | 4,268 |  | 4,268 |
| 2017 |  | 34,358 |  | 34,358 |
| 2018 |  | 24,452 |  | 24,452 |
| Future years |  | 332,431 |  | 332,431 |
| Total | $ | 403,793 | $ | 403,793 |
*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 wi th MGE's debt (see Footnote 2 for further information).

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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