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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Estimated Fair Market Value of Financial Instruments | The estimated fair market value of MGE Energy's and MGE's financial instruments are as follows:
|  |  | 2013 |  |  | 2012 |
|  |  | Carrying |  | Fair |  |  | Carrying |  | Fair |
| (In thousands) |  | Amount |  | Value |  | Amount |  | Value |
| MGE Energy |  |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |  |
| Cash and cash equivalents | $ | 68,813 | $ | 68,813 |  | $ | 46,357 | $ | 46,357 |
| Liabilities: |  |  |  |  |  |  |  |  |  |
| Long-term debt* |  | 403,793 |  | 432,010 |  |  | 361,805 |  | 427,456 |
| MGE |  |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |  |
| Cash and cash equivalents | $ | 14,808 | $ | 14,808 |  | $ | 6,350 | $ | 6,350 |
| Liabilities: |  |  |  |  |  |  |  |  |  |
| Long-term debt* |  | 403,793 |  | 432,010 |  |  | 361,805 |  | 427,456 |
| *Includes long-term debt due within one year. |  |  |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table presents the balances of assets and liabilities measured at fair value on a recurring basis for MGE Energy and MGE.
|  | Fair Value as of December 31, 2013 |
| (In thousands) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
| MGE Energy |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |
| Exchange-traded investments | $ | 792 | $ | 792 | $ | 0 | $ | 0 |
| Total Assets | $ | 792 | $ | 792 | $ | 0 | $ | 0 |
| Liabilities: |  |  |  |  |  |  |  |  |
| Derivatives, net(a) | $ | 63,893 | $ | (735) | $ | 0 | $ | 64,628 |
| Deferred compensation |  | 2,364 |  | 0 |  | 2,364 |  | 0 |
| Total Liabilities | $ | 66,257 | $ | (735) | $ | 2,364 | $ | 64,628 |
| MGE |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |
| Exchange-traded investments | $ | 431 | $ | 431 | $ | 0 | $ | 0 |
| Total Assets | $ | 431 | $ | 431 | $ | 0 | $ | 0 |
| Liabilities: |  |  |  |  |  |  |  |  |
| Derivatives, net(a) | $ | 63,893 | $ | (735) | $ | 0 | $ | 64,628 |
| Deferred compensation |  | 2,364 |  | 0 |  | 2,364 |  | 0 |
| Total Liabilities | $ | 66,257 | $ | (735) | $ | 2,364 | $ | 64,628 |
| (a) These amounts are shown gross and exclude $0.2 million of collateral that was posted |
| against derivative positions with counterparties. |
|  | Fair Value as of December 31, 2012 |
| (In thousands) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
| MGE Energy |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |
| Exchange-traded investments | $ | 320 | $ | 320 | $ | 0 | $ | 0 |
| Total Assets | $ | 320 | $ | 320 | $ | 0 | $ | 0 |
| Liabilities: |  |  |  |  |  |  |  |  |
| Derivatives, net | $ | 72,329 | $ | (17) | $ | 0 | $ | 72,346 |
| Deferred compensation |  | 2,010 |  | 0 |  | 2,010 |  | 0 |
| Total Liabilities | $ | 74,339 | $ | (17) | $ | 2,010 | $ | 72,346 |
| MGE |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |
| Exchange-traded investments | $ | 117 | $ | 117 | $ | 0 | $ | 0 |
| Total Assets | $ | 117 | $ | 117 | $ | 0 | $ | 0 |
| Liabilities: |  |  |  |  |  |  |  |  |
| Derivatives, net | $ | 72,329 | $ | (17) | $ | 0 | $ | 72,346 |
| Deferred compensation |  | 2,010 |  | 0 |  | 2,010 |  | 0 |
| Total Liabilities | $ | 74,339 | $ | (17) | $ | 2,010 | $ | 72,346 |
Significant Unobservable Inputs | The following table presents the significant unobservable inputs used in the pricing model.
| Significant Unobservable Inputs |  | Model Input |
| Basis adjustment: |  |  |
| On peak |  | 94.2% |
| Off peak |  | 92.6% |
| Counterparty fuel mix: |  |  |
| Internal generation |  | 50%-70% |
| Purchased power |  | 50%-30% |
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table summarizes the changes in Level 3 assets and liabilities measured at fair value on a recurring basis for both MGE Energy and MGE.
| (In thousands) |  | 2013 |  | 2012 |  | 2011 |
| Balance as of January 1, | $ | (72,346) | $ | (40,661) | $ | (19,216) |
| Realized and unrealized gains (losses): |  |  |  |  |  |  |
| Included in regulatory liabilities (assets) |  | 7,718 |  | (31,685) |  | (21,445) |
| Included in other comprehensive income |  | 0 |  | 0 |  | 0 |
| Included in earnings |  | (2,618) |  | (5,005) |  | 868 |
| Included in current assets |  | (108) |  | 0 |  | 0 |
| Purchases |  | 23,726 |  | 13,370 |  | 341 |
| Sales |  | (2) |  | 92 |  | 144 |
| Issuances |  | 0 |  | 0 |  | 0 |
| Settlements |  | (20,998) |  | (8,457) |  | (1,353) |
| Transfers in and/or out of Level 3 |  | 0 |  | 0 |  | 0 |
| Balance as of December 31, | $ | (64,628) | $ | (72,346) | $ | (40,661) |
| Total gains (losses) included in earnings attributed to the |  |  |  |  |  |  |
| change in unrealized gains (losses) related to assets and |  |  |  |  |  |  |
| liabilities held at December 31,(b) | $ | 0 | $ | 0 | $ | 0 |
(b) MGE's exchange-traded derivative contracts, over-the-count er party transactions, ten-year purchased power agreement, and FTRs are subject to regulatory deferral. These derivatives are therefore marked to fair value and are offset with a corresponding regulatory asset or liability.
Gains and Losses Included in Income for Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table presents total realized and unrealized gains (losses) included in income for Level 3 assets and liabilities measured at fair value on a recurring basis for both MGE Energy and MGE (b).
| (In thousands) |  |  |  |  |  |  |
| Year Ended December 31, |  | 2013 |  | 2012 |  | 2011 |
| Purchased Power Expense | $ | (2,618) | $ | (5,005) | $ | 868 |
(b) MGE's exchange-traded derivative contracts, over-the-count er party transactions, ten-year purchased power agreement, and FTRs are subject to regulatory deferral. These derivatives are therefore marked to fair value and are offset with a corresponding regulatory asset or liability.

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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph c(2), d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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