Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended		12 Months Ended	3 Months Ended			3 Months Ended
	Mar. 31, 2014 item	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Hotel Employees and Restaurant Employees [Member]	Mar. 31, 2014 International Brotherhood of Electrical Workers [Member] item	Dec. 31, 2013 Homer Electric Association, Inc. And Matanuska Electric Association, Inc. [Member]	Mar. 31, 2014 Matanuska Electric Association, Inc. [Member]	Mar. 31, 2014 Homer Electric Association, Inc. [Member]	Dec. 31, 2013 Homer Electric Association, Inc. [Member]	Mar. 31, 2014 GVEA Economy Energy Sales [Member]	Mar. 31, 2013 GVEA Economy Energy Sales [Member]	Mar. 31, 2014 ConocoPhillips (COP) [Member] MMcf	Mar. 31, 2014 Marathon Alaska Production, LLC [Member]	Mar. 31, 2014 Hilcorp Alaska - Cook Inlet [Member] MMcf
Commitments And Contingencies [Line Items]
Percentage of employees belonging to unions	70.00%
Number of collective bargaining agreements					3
Expiration date of collective bargaining agreements				Jun. 30, 2016	Jun. 30, 2017
Operating revenues	$ 76,098,886	$ 77,748,517				$ 103,100,000	$ 19,200,000			$ 10,400,000	$ 8,900,000
Customer percentage of operating revenue						34.00%	26.00%
Contract expiration for power							Dec. 31, 2014	Dec. 31, 2013
Number of contract extensions	2
Commencement date of long term contract for purchase of gas supply												Aug. 21, 2009	May 17, 2010	Jul. 01, 2013
Expiration date of long term contract for purchase of gas supply												Dec. 31, 2016
Estimated amount of gas under contract												60,000		57,600
Percentage of fuel supply needs filled by contracts	100.00%
Commencement date of long term contract for economy energy sales										Oct. 05, 2012
Expiration date of long term contract for economy energy sales										Mar. 31, 2015
Number of years to return patronage capital after expiration of power agreement								5 years
Patronage capital payable	$ 7,931,295		$ 7,931,295					$ 7,900,000	$ 7,900,000
Name of plaintiff	Matanuska Electric Association
Date of summons and complaint	May 14, 2013
Description of complaint	MEA fundamentally asks that Chugach be required to repatriate MEA's capital credits on the same basis as it promised, in a 2007 settlement, that it would repatriate HEA capital credits.