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Derivative and Hedging Instruments (Tables)
9 Months Ended
Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Gross Notional Volume of Open Derivatives

The gross notional volume of open derivatives is as follows:

  September 30, 2013 December 31, 2012 
 Commodity derivative contracts300,195 MWh 444,650 MWh 
 Commodity derivative contracts5,970,000 Dth 1,980,000 Dth 
 FTRs3,099 MW 2,670 MW 
Fair Value of Derivative Instruments on the Balance Sheet

The following table summarizes the fair value of the derivative instruments on the consolidated balance sheet. All derivative instruments in this table are presented on a gross basis and are calculated prior to the netting of instruments with the same counterparty under a master netting agreement as well as the netting of collateral. For financial statement purposes, MGE Energy and MGE have netted instruments with the same counterparty under a master netting agreement as well as the netting of collateral.

 Asset Derivatives Liability Derivatives
(In thousands)Balance Sheet Location Fair Value Balance Sheet Location Fair Value
September 30, 2013       
Commodity derivative contractsOther current assets$608Derivative liability (current)$213
Commodity derivative contractsOther deferred charges 32 Derivative liability (long-term) 18
FTRsOther current assets 528 Derivative liability (current) 0
Ten-year PPAN/A N/A Derivative liability (current) 9,310
Ten-year PPAN/A N/A Derivative liability (long-term) 59,710
        
December 31, 2012       
Commodity derivative contractsOther current assets$365 Derivative liability (current)$394
Commodity derivative contractsOther deferred charges 95 Derivative liability (long-term) 11
FTRsOther current assets 206 Derivative liability (current) 0
Ten-year PPAN/A N/A Derivative liability (current) 9,270
Ten-year PPAN/A N/A Derivative liability (long-term) 63,320
Offsetting Assets

The following tables show the effect of netting arrangements for recognized derivative assets and liabilities that are subject to a master netting arrangement or similar arrangement on the balance sheet.

 Offsetting of Derivative Assets 
           
     Gross amounts Collateral Net amount 
     offset in posted against presented in 
 (In thousands) Gross amounts balance sheet derivative positions balance sheet 
 September 30, 2013         
 Commodity derivative contracts$ 640$ (231)$ - $ 409 
 FTRs  528  -   -   528 
           
 December 31, 2012         
 Commodity derivative contracts$ 460$ (405)$ - $ 55 
 FTRs  206  -   -   206 
Offsetting Liabilities
 Offsetting of Derivative Liabilities 
           
     Gross amounts Collateral Net amount 
     offset in posted against presented in 
 (In thousands) Gross amounts balance sheet derivative positions balance sheet 
 September 30, 2013         
 Commodity derivative contracts$ 231$ (231)$ - $ -  
 Ten-year PPA  69,020  -   -   69,020 
           
 December 31, 2012         
 Commodity derivative contracts$ 405$ (405)$ - $ -  
 Ten-year PPA  72,590  -   -   72,590 
Derivative Gains and Losses in Balance Sheet

The following tables summarize the unrealized and realized gains and losses related to the derivative instruments on the consolidated balance sheet at September 30, 2013 and 2012, and the consolidated income statement for the three and nine months ended September 30, 2013 and 2012.

  2013  2012
(In thousands) Current and long-term regulatory asset Other current assets  Current and long-term regulatory asset Other current assets
Three Months Ended September 30:         
Balance at July 1,$66,649$658 $79,362$718
Change in unrealized loss (gain) 2,330 0  (468) 0
Realized loss reclassified to a deferred account (275) 275  (223) 223
Realized loss reclassified to income         
statement (621) (111)  (3,414) (161)
Balance at September 30,$68,083$822 $75,257$780
          
Nine Months Ended September 30:         
Balance at January 1,$72,329$574 $42,356$1,604
Change in unrealized loss (gain) (1,330) 0  42,633 0
Realized loss reclassified to a deferred account (953) 953  (3,103) 3,103
Realized loss reclassified to income         
statement (1,963) (705)  (6,629) (3,927)
Balance at September 30,$68,083$822 $75,257$780
Derivative Gains and Losses in Income Statement
   Realized losses (gains) 
     Fuel for electric    
   Regulated generation/ Cost of  
 (In thousands) gas revenues purchased power gas sold 
 Three Months Ended September 30, 2013:       
 Commodity derivative contracts$0$(7)$0 
 FTRs 0 (387) 0 
 Ten-year PPA 0 1,126 0 
         
 Three Months Ended September 30, 2012:       
 Commodity derivative contracts$0$176$0 
 FTRs 0 (256) 0 
 Ten-year PPA 0 3,655 0 
         
 Nine Months Ended September 30, 2013:       
 Commodity derivative contracts$0$(523)$608 
 FTRs 0 (896) 0 
 Ten-year PPA 0 3,479 0 
         
 Nine Months Ended September 30, 2012:       
 Commodity derivative contracts$0$2,685$3,090 
 FTRs 0 (93) 0 
 Ten-year PPA 0 4,874 0