Patronage Capital (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Patronage Capital [Line Items]
Patronage capital	$ 169,996,436	$ 167,447,781
Patronage capital assigned	164,182,580	160,944,929
Patronage capital to be assigned to members	5,813,856	6,502,852
Patronage capital payable	12,008,499	11,108,071
Retirement of capital credits	3,265,201	3,190,124	$ 5,130,381
Excluding Homer Electric Association Retirement [Member]
Patronage Capital [Line Items]
Retirement of capital credits	3,265,201	3,190,124	5,130,381
Excluding Matanuska Electric Association And Homer Electric Association Patronage Capital [Member]
Patronage Capital [Line Items]
Liability of capital credits	$ 2,014,080	2,105,440	$ 1,042,064
Assignable Margins [Member]
Patronage Capital [Line Items]
Secured debt covenant restriction during period	50.00%
Homer Electric Association, Inc. [Member]
Patronage Capital [Line Items]
Return of patronage capital term after expiration date of Power Sales Agreement	5 years
Expiration date of power sales agreement	Dec. 31, 2013
Patronage capital payable	$ 7,900,000	7,900,000
Matanuska Electric Association, Inc. [Member]
Patronage Capital [Line Items]
Patronage capital payable	$ 4,100,000	$ 3,200,000
Minimum [Member] | Aggregate Equities And Margins To Total Liabilities And Equities And Margins [Member]
Patronage Capital [Line Items]
Secured debt covenant restriction during period	30.00%
Patronage Capital [Member]
Patronage Capital [Line Items]
Secured debt covenant restriction at period end	5.00%