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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |
Contractual Obligation, Fiscal Year Maturity Schedule | As of December 31, 2013, the future minimum commitments related to these pur chase contracts were as follows:
| (In thousands) |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |
| Coal(a) | $ | 22,109 | $ | 14,633 | $ | 10,938 | $ | 5,073 | $ | 2,710 |
| Natural Gas |  |  |  |  |  |  |  |  |  |  |
| Transportation and storage(b) |  | 17,211 |  | 16,857 |  | 9,288 |  | 272 |  | 191 |
| Supply(c) |  | 19,511 |  | 0 |  | 0 |  | 0 |  | 0 |
| Purchase Power(d) |  | 47,241 |  | 45,711 |  | 46,467 |  | 46,928 |  | 47,911 |
| Other |  | 2,314 |  | 498 |  | 498 |  | 498 |  | 124 |
|  | $ | 108,386 | $ | 77,699 | $ | 67,191 | $ | 52,771 | $ | 50,936 |
(a) Total coal commitments for the Columbia and Elm Road Units, including transportation. Fuel procurement for MGE's jointly owned Columbia and Elm Road Units are handled by WPL and WEPCO, respectively, who are the operators of those facilities. If any minimum purchase obligations must be paid under these contracts, management believes these obligations would be considered costs of service and recoverable in rates. (b) MGE's natural gas transportation and storage contracts require fixed monthly payments for firm supply pipeline transportation and storage capacity. The pricing components of the fixed monthly payments for the transportation and storage contracts are established by FERC but may be subject to change. (c) These commitments include market-based pricing. Management expects to recover these costs in future customer rates. (d) MGE has several purchase power agreements to help meet future electric supply requirements. Management expects to recover these costs in future customer rates. In October 2008, MGE entered into a ten-year purchase power agreement to help meet future electric supply requirements. Under this agreement, MGE has agreed to purchase 50 MW of wind power from Osceola Windpower II, LLC, which is located in Iowa. This facility became operational in October 2008. MGE does not have any capacity payment commitments under this agreement. However, MGE is obligated to purchase its ratable share of the energy produced by the project. MGE's commitment related to its ratable share of energy produced by the project has been estimated and is included in the above numbers.
Guarantor Obligations, Fiscal Year Maturity Schedule | Principal payments for the next five years on the loans are:
| (In thousands) |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |
| Principal payments | $ | 714 | $ | 1,007 | $ | 910 | $ | 506 | $ | 449 |
Operating Leases, Future Minimum Rental Payments | Future minimum rental payments at December 31, 2013, under agreements classified as operating leases with noncancelable terms in excess of one year are as follows:
| (In thousands) |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | Thereafter |
| Minimum lease payments | $ | 1,668 | $ | 1,478 | $ | 983 | $ | 718 | $ | 418 | $ | 8,179 |
Other Commitments | MGE has several other commitments related to various projects. Payments for these commitments are expected to be as follows:
| (In thousands) |  | 2014 |  | 2015 |  | 2016 |  | 2017 |  | 2018 |  | Thereafter |
| Other Commitments | $ | 1,473 | $ | 474 | $ | 475 | $ | 433 | $ | 435 | $ | 6,961 |

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- Definition Tabular disclosure of the aggregate amount of payments due on known guarantor obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known guarantor obligations. + References No definition available. + Details
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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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