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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2015
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 s as of December 31:
| (In thousands) |  |  | 2015 |  |  | 2014 |
| Regulatory Assets |  |  |  |  |  |  |
| Asset retirement obligation |  | $ | 4,849 |  | $ | 4,532 |
| Debt related costs |  |  | 10,672 |  |  | 11,133 |
| Derivatives |  |  | 54,083 |  |  | 54,998 |
| Environmental costs |  |  | 368 |  |  | 700 |
| Tax recovery related to AFUDC equity |  |  | 8,950 |  |  | 8,821 |
| Unfunded pension and other postretirement liability |  |  | 78,181 |  |  | 84,551 |
| Other |  |  | 634 |  |  | 448 |
| Total Regulatory Assets |  | $ | 157,737 |  | $ | 165,183 |
| Regulatory Liabilities |  |  |  |  |  |  |
| Conservation costs |  | $ | 231 |  | $ | 680 |
| Deferred fuel savings |  |  | 9,515 |  |  | 755 |
| Elm Road |  |  | 643 |  |  | 1,497 |
| Income taxes |  |  | 1,559 |  |  | 1,794 |
| Non-ARO removal costs |  |  | 17,137 |  |  | 16,129 |
| Renewable energy credits |  |  | 327 |  |  | 753 |
| Other |  |  | 888 |  |  | 1,107 |
| Total Regulatory Liabilities |  | $ | 30,300 |  | $ | 22,715 |

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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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- References No definition available. + Details
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