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Commitments And Contingencies (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
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Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Beluga Power Plant [Member]
Dec. 31, 2011
Beluga Power Plant [Member]
Dec. 31, 2010
Beluga Power Plant [Member]
Dec. 31, 2012
Cooper Lake Hydroelectric Project [Member]
Dec. 31, 2013
Forecast [Member]
Dec. 31, 2012
Homer Electric Association, Inc. And Matanuska Electric Association, Inc. [Member]
Dec. 31, 2011
Homer Electric Association, Inc. And Matanuska Electric Association, Inc. [Member]
Dec. 31, 2010
Homer Electric Association, Inc. And Matanuska Electric Association, Inc. [Member]
Dec. 31, 2012
Homer Electric Association, Inc. [Member]
Dec. 31, 2011
Homer Electric Association, Inc. [Member]
Dec. 31, 2010
Homer Electric Association, Inc. [Member]
Dec. 31, 2012
ConocoPhillips (COP) [Member]
MMcf
Dec. 31, 2012
Marathon Alaska Production, LLC [Member]
MMcf
Percentage of employees belonging to unions                 70.00%                              
Number of collective bargaining agreements with IBEW                 3                              
Operating revenues $ 74,483,455 $ 62,675,511 $ 58,631,729 $ 71,180,773 $ 76,828,268 $ 68,778,352 $ 68,517,526 $ 69,494,223 $ 266,971,468 $ 283,618,369 $ 258,325,345         $ 2,000,000 $ 100,600,000 $ 104,000,000 $ 89,100,000          
Customer percentage of operating revenue                                 39.00% 37.00% 35.00%          
Estimated amount of gas under contract                                             60,000 40,000
Expiration date of long term contract for purchase of gas supply                                             December 31, 2016 December 31, 2014
Percentage of fuel supply needs filled by contracts, through 2014                 100.00%                              
Percentage of fuel supply needs filled by contracts, in 2015                 70.00%                              
Percentage of fuel supply needs filled by contracts, in 2016                 40.00%                              
Percentage of power generated from gas                 89.00% 92.00% 89.00% 83.00% 79.00% 78.00%                    
Number of years to return patronage capital after expiration of power agreement                                       5 years        
Patronage Capital 153,832,674       148,355,246       153,832,674 148,355,246                   6,900,000 6,600,000 6,500,000    
Regulatory initial cost charge per KWH                 0.000626                              
Regulatory current cost charge per KWH                 0.000568                              
Percentage of retail bill collected to move existing overhead lines underground                 2.00%                              
Liability for moving overhead lines underground 3,786,031       2,611,110       3,786,031 2,611,110                            
Percentage ownership in natural gas-fired generation plant on land owned by Chugach 70.00%               70.00%                              
Number of gas turbines                 3                              
Payments made on contracts associated with power project                 85,700,000 130,500,000           13,000,000                
Duration of license agreement with FERC                             50 years                  
Estimated cost to complete project at time of relicense                             12,000,000                  
Estimated project costs                             21,900,000                  
Grants received from state                             600,000                  
Grants authorized from state                             5,800,000                  
Grants requested from state                             $ 3,500,000