Consolidated Statements Of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Assignable margins	$ 1,309,991	$ 181,768
Adjustments to reconcile assignable margins to net cash provided by operating activities:
Depreciation and amortization	26,936,964	26,435,059
Amortization and depreciation cleared to operating expenses	3,548,294	3,799,494
Allowance for funds used during construction	(45,219)	(117,189)
Write off of inventory, deferred charges and projects	393,341	774,190
Other	(52,782)	42,267
(Increase) decrease in assets:
Accounts receivable, net	1,955,518	1,242,132
Fuel cost under-recovery	(1,443,967)	0
Materials and supplies	2,183,548	792,607
Fuel stock	(4,452,097)	(1,436,315)
Prepayments	(3,514,464)	(1,588,834)
Other assets	4	(56,821)
Deferred charges	(432,465)	(3,186,363)
Increase (decrease) in liabilities:
Accounts payable	(1,282,462)	(828,693)
Consumer deposits	12,158	115,384
Fuel cost over-recovery	(3,824,722)	76,906
Accrued interest	(4,777,716)	(4,822,053)
Salaries, wages and benefits	(5,801)	(8,242)
Fuel	3,217,295	393,451
Other current liabilities	131,182	(586,163)
Deferred liabilities	0	6,131
Net cash provided by operating activities	19,856,600	21,228,716
Cash flows from investing activities:
Return of capital from investment in associated organizations	370,010	319,233
Investment in restricted cash equivalents	(2,967)	(199)
Investment in marketable securitiesand investments-other	(1,158,521)	(8,895,871)
Investment in Beluga River Unit	0	(44,421,161)
Proceeds from capital grants	115,452	387,692
Extension and replacement of plant	(21,844,914)	(26,494,465)
Net cash used in investing activities	(22,520,940)	(79,104,771)
Cash flows from financing activities:
Payments for debt issue costs	(208,498)	(274,373)
Net increase (decrease) in short-term obligations	(17,200,000)	45,200,000
Proceeds from long-term obligations	40,000,000	45,600,000
Repayments of long-term obligations	(24,038,667)	(47,269,832)
Memberships and donations received	209,899	102,806
Retirement of patronage capital and estate payments	(484,345)	(209,043)
Net receipts on consumer advances for construction	3,679,338	2,817,862
Net cash provided by financing activities	1,957,727	45,967,420
Net change in cash and cash equivalents	(706,613)	(11,908,635)
Cash and cash equivalents at beginning of period	4,672,935	15,626,919
Cash and cash equivalents at end of period	3,966,322	3,718,284
Supplemental disclosure of non-cash investing and financing activities:
Cost of removal obligation	743,256	5,776,366
Extension and replacement of plant included in accounts payable	1,291,167	2,195,012
Supplemental disclosure of cash flow information - interest expense paid, net of amounts capitalized	$ 20,518,560	$ 19,980,489