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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2013
Regulatory Assets and Liabilities Disclosure [Abstract] |
Regulatory Assets and Liabilities | The following regulatory assets and liab ilities are reflected in MGE's c onsolidated b alance s heet as of December 31:
| (In thousands) |  |  | 2013 |  |  | 2012 |
| Regulatory Assets |  |  |  |  |  |  |
| Asset retirement obligation |  | $ | 4,863 |  | $ | 4,608 |
| Debt related costs |  |  | 11,786 |  |  | 5,468 |
| Derivatives |  |  | 63,893 |  |  | 72,328 |
| Elm Road |  |  | 0 |  |  | 2,614 |
| Environmental costs |  |  | 920 |  |  | 1,154 |
| Pension and OPRB costs |  |  | 0 |  |  | 1,234 |
| Tax recovery related to AFUDC equity |  |  | 6,956 |  |  | 5,241 |
| Unfunded pension and other postretirement liability |  |  | 24,591 |  |  | 134,839 |
| Other |  |  | 534 |  |  | 1,694 |
| Total regulatory assets |  | $ | 113,543 |  | $ | 229,180 |
| Regulatory Liabilities |  |  |  |  |  |  |
| Conservation costs |  | $ | 455 |  | $ | 455 |
| Deferred fuel savings |  |  | 13,386 |  |  | 6,163 |
| Elm Road |  |  | 607 |  |  | 0 |
| Income taxes |  |  | 2,082 |  |  | 2,346 |
| Non-ARO removal cost |  |  | 15,182 |  |  | 13,957 |
| Renewable energy credits |  |  | 574 |  |  | 480 |
| Other |  |  | 1,044 |  |  | 1,137 |
| Total regulatory liabilities |  | $ | 33,330 |  | $ | 24,538 |

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- Definition Tabular disclosure of regulatory assets and liabilities. Assets are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Liabillities are the result of rate actions a regulator can impose on a regulated enterprise resulting in a regulatory liability. + References No definition available. + Details
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- Details
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