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Fair Value of Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Fair Value of Financial Instruments (Tables) [Abstract] |
Estimated Fair Market Value of Financial Instruments |
|  |  | March 31, 2013 |  |  | December 31, 2012 |
|  |  | Carrying |  | Fair |  |  | Carrying |  | Fair |
| (In thousands) |  | Amount |  | Value |  | Amount |  | Value |
| MGE Energy |  |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |  |
| Cash and cash equivalents | $ | 45,894 | $ | 45,894 |  | $ | 46,357 | $ | 46,357 |
| Liabilities: |  |  |  |  |  |  |  |  |  |
| Short-term debt - commercial paper |  | 10,500 |  | 10,500 |  |  | 0 |  | 0 |
| Long-term debt* |  | 361,138 |  | 432,430 |  |  | 361,805 |  | 427,456 |
| MGE |  |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |  |
| Cash and cash equivalents |  | 9,856 |  | 9,856 |  |  | 6,350 |  | 6,350 |
| Liabilities: |  |  |  |  |  |  |  |  |  |
| Short-term debt - commercial paper |  | 10,500 |  | 10,500 |  |  | 0 |  | 0 |
| Long-term debt* |  | 361,138 |  | 432,430 |  |  | 361,805 |  | 427,456 |
| *Includes long-term debt due within one year. |  |  |  |  |  |  |  |
Assets and Liabilities Measured at Fair Value on a Recurring Basis |
|  | Fair Value as of March 31, 2013 |
| (In thousands) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
| MGE Energy |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |
| Exchange-traded investments | $ | 428 | $ | 428 | $ | 0 | $ | 0 |
| Total Assets | $ | 428 | $ | 428 | $ | 0 | $ | 0 |
| Liabilities: |  |  |  |  |  |  |  |  |
| Derivatives, net(a) | $ | 69,197 | $ | (401) | $ | 0 | $ | 69,598 |
| Deferred compensation |  | 2,085 |  | 0 |  | 2,085 |  | 0 |
| Total Liabilities | $ | 71,282 | $ | (401) | $ | 2,085 | $ | 69,598 |
| MGE |  |  |  |  |  |  |  |  |
| Assets: |  |  |  |  |  |  |  |  |
| Exchange-traded investments | $ | 161 | $ | 161 | $ | 0 | $ | 0 |
| Total Assets | $ | 161 | $ | 161 | $ | 0 | $ | 0 |
| Liabilities: |  |  |  |  |  |  |  |  |
| Derivatives, net(a) | $ | 69,197 | $ | (401) | $ | 0 | $ | 69,598 |
| Deferred compensation |  | 2,085 |  | 0 |  | 2,085 |  | 0 |
| Total Liabilities | $ | 71,282 | $ | (401) | $ | 2,085 | $ | 69,598 |
| (a) These amounts are shown gross and exclude $0.5 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 |
| Significant Unobservable Inputs |  | Model Input |
| Basis adjustment: |  |  |
| On peak |  | 97.1% |
| Off peak |  | 96.0% |
| 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 |
|  |  | Three Months Ended |
|  |  | March 31, |
| (In thousands) |  | 2013 |  | 2012 |
| Beginning balance, | $ | (72,346) | $ | (40,661) |
| Realized and unrealized gains (losses): |  |  |  |  |
| Included in regulatory liabilities (assets) |  | 2,748 |  | (30,527) |
| Included in other comprehensive income |  | 0 |  | 0 |
| Included in earnings |  | (1,148) |  | (1,502) |
| Included in current assets |  | 0 |  | (50) |
| Purchases |  | 5,562 |  | 50 |
| Sales |  | (3) |  | 31 |
| Issuances |  | 0 |  | 0 |
| Settlements |  | (4,411) |  | 1,471 |
| Transfers in and/or out of Level 3 |  | 0 |  | 0 |
| Balance as of March 31, | $ | (69,598) | $ | (71,188) |
| Total gains (losses) included in earnings attributed to |  |  |  |  |
| the change in unrealized gains (losses) related to |  |  |  |  |
| assets and liabilities held at March 31,(b) | $ | 0 | $ | 0 |
Gains and Losses Included in Income for Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis |
|  |  | Three Months Ended |
|  |  | March 31, |
| (In thousands) |  | 2013 |  | 2012 |
| Purchased Power Expense | $ | (1,148) | $ | (1,502) |
| Cost of Gas Sold Expense |  | 0 |  | 0 |
| Regulated Gas Revenues |  | 0 |  | 0 |
| Total | $ | (1,148) | $ | (1,502) |

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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 No definition available. + Details
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- Definition Tabular disclosure of the total amount of gains or losses for the period which are included in earnings or resulted in a change to net assets which gains or losses have arisen from the use of significant unobservable inputs (Level 3) to measure the fair value of assets and liabilities. Such gains or losses are attributable to the change in unrealized gains or losses relating to those assets and liabilities so valued which are still held at the reporting date and which change are also considered for disclosure; it may be expected that a description of where those unrealized gains or losses are reported in the statement of income or the statement of financial position would also be disclosed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph 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 157 -Paragraph 32 -Subparagraph c(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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1),(d) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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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 Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 Reference 2: 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=6925170&loc=d3e19207-110258 Reference 3: 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 4: 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 5: 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 6: 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=6947722&loc=d3e13476-108611 Reference 7: 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 8: 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=6947722&loc=d3e13467-108611 Reference 9: 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 10: 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 11: 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 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 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 -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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