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Fair Value of Financial Instruments | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Fair Value of Financial Instruments | Fair Value of Financial Instruments - MGE Energy and MGE. Fair value is defined as the price that would be received to sell an asset or would be paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. The standard clarifies that fair value should be based on the assumptions market participants would use when pricing the asset or liability including assumptions about risk. The standard also establishes a three level fair value hierarchy based upon the observability of the assumptions used and requires the use of observable market data when available. The levels are: Level 1 - Pricing inputs are quoted prices within active markets for identical assets or liabilities. Level 2 - Pricing inputs are quoted prices within active markets for similar assets or liabilities; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations that are correlated with or otherwise verifiable by observable market data. Level 3 - Pricing inputs are unobservable and reflect management's best estimate of what market participants would use in pricing the asset or liability. a. Fair Value of Financial Assets and Liabilities Recorded at the Carrying Amount. At December 31, 2013 and 2012, the carrying amount of cash and cash equivalents approximates fair market value due to the short maturity of those investments and obligations. The estimated fair market value of MGE Energy's and MGE long-term debt is based on quoted market prices for similar financial instru ments at December 31. Since long-term debt is not traded in an active market, it is cl assified as Level 2. 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. |  |  |  |  |  |  |  |
b. Recurring Fair Value Measurements. 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 |
No transfers were made in or out of Level 1 or Level 2 for the year ended December 31, 2013. I nvestments include exchange-traded investment securities valued using quoted prices on active exchanges and are therefore classified as Level 1. Derivatives include exchange-traded derivative c ontracts, over-the-counter transactions, a ten-year purchased power agreement, and FTRs. Most exchange-traded derivative contracts are valued based on unadjusted quoted prices in active markets and are therefore classified as Level 1. A small number of exchange-traded derivative contracts are valued using quoted market pricing in markets with insufficient volumes and are therefore considered unobservable and classified as Level 3. Transactions done with an over-the-counter party are on inactive markets and are therefore classified as Level 3. These transactions are valued based on quoted prices from markets with similar exchange traded transactions. FTRs are priced based upon monthly auction results for identical or similar instruments in a closed market with limited data available and are therefore classified as Level 3. The ten-year purchased power agreement (see Footnote 16) was valued using an internally-developed pricing model and therefore is classified as Level 3. The model projects future market energy prices and compares those prices to the projected power costs to be incurred under the contract. Inputs to the model require significant management judgment and estimation. Future energy prices are based on a forward power pricing curve using exchange-traded contracts in the electric futures market, where such exchange-traded contracts exist, and upon calculations based on forward gas prices, where such exchange-traded contracts do not exist. A basis adjustment is applied to the market energy price to reflect the price differential between the market price delivery point and the counterparty delivery point. The historical relationship between the delivery points is reviewed and a discount (below 100%) or premium (above 100%) is derived. This comparison is done for both peak times when demand is high and off peak times when demand is low. If the basis adjustment is lowered, the fair value measurement will decrease and if the basis adjustment is increased, the fair value measurement will increase. The projected power costs anticipated to be incurred under the purchased power agreement are determined using many factors, including historical generating costs, future prices, and expected fuel mix of the counterparty. An increase in the projected fuel costs would result in a decrease in the fair value measurement of the purchased power agreement. A significant input that MGE estimates is the counterparty's fuel mix in determining the projected power cost. MGE also considers the assumptions that market participants would use in valuing the asset or liability. This consideration includes assumptions about market risk such as liquidity, volatility, and contract duration. The fair value model uses a discount rate that incorporates discounting, credit, and model risks. This model is prepared by members of MGE's Energy Supply group. It is reviewed on a quarterly basis by management in Energy Supply and Finance to review the assumptions, inputs, and fair value measurements. 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% |
The deferred compensation plan allows participants to defer certain cash compensation into a notional investment account. These amounts are included within other deferred liabilities in the consolidated balance sheets of MGE Energy and MGE. The notional investments earn interest based upon the semiannual rate of U.S. Treasury Bills having a 26 week maturity increased by 1% compounded monthly with a minimum annual rate of 7%, compounded monthly. The notional investments are based upon observable market data, however since the deferred compensation obligations themselves are not exchanged in an active market they are classified as Level 2. 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 |
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 The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -Subparagraph a-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 107 -Paragraph 15C, 15D -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 107 -Paragraph 3, 10, 14, 15 -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 Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32, 33, 34 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15B -Subparagraph a, b -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 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 17-22, 27, 28 -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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