Consolidated Statements of Financial Position - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Electric Plant
In service	$ 5,802,844	$ 5,682,613
Construction work in progress	175,567	212,081
Total electric plant	5,978,411	5,894,694
Less allowances for depreciation and amortization	(2,409,020)	(2,361,555)
Net electric plant	3,569,391	3,533,139
Other plant	283,546	234,457
Less allowances for depreciation, amortization, and depletion	(105,660)	(89,809)
Net other plant	177,886	144,648
Total property, plant and equipment	3,747,277	3,677,787
Other assets and investments
Investment in other associations	143,608	139,350
Investments in and advances to coal mines	18,274	18,176
Restricted cash and investments	5,979	1,000
Intangible assets, net of accumulated amortization	10,986	18,310
Other noncurrent assets	9,604	11,542
Total other assets and investments	188,451	188,378
Current assets
Cash and cash equivalents	143,694	165,893
Restricted cash and investments	1,292	997
Deposits and advances	27,881	25,141
Accounts receivable—Members	102,035	97,925
Other accounts receivable	16,034	24,837
Coal inventory	46,849	63,945
Materials and supplies	89,459	87,768
Total current assets	427,244	466,506
Deferred charges
Regulatory assets	454,523	395,615
Prepayment—NRECA Retirement Security Plan	37,607	43,627
Other	38,492	139,378
Total deferred charges	530,622	578,620
Total assets	4,893,594	4,911,291
Capitalization
Patronage capital equity	1,003,020	961,364
Accumulated other comprehensive income (loss)	(210)	(286)
Noncontrolling interest	111,295	109,147
Total equity	1,114,105	1,070,225
Long-term debt	3,120,286	3,139,705
Total capitalization	4,234,391	4,209,930
Current liabilities
Member advances	8,447	11,363
Accounts payable	117,510	105,511
Short-term borrowing	144,667	119,901
Accrued expenses	32,484	32,719
Current asset retirement obligation	3,087	6,237
Accrued interest	32,852	34,166
Accrued property taxes	27,137	27,584
Current maturities of long-term debt	78,004	107,903
Total current liabilities	444,188	445,384
Deferred credits and other liabilities
Regulatory liabilities	81,824	95,512
Deferred income tax liability	17,205	30,517
Intangible liabilities		3,263
Asset retirement obligations	53,768	52,346
Other	53,396	66,164
Total deferred credits and other liabilities	206,193	247,802
Accumulated postretirement benefit and postemployment obligations	8,822	8,175
Total equity and liabilities	$ 4,893,594	$ 4,911,291