Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Electric plant:
In service	$ 8,805,272	$ 8,786,839
Less: Accumulated provision for depreciation	(4,164,233)	(4,115,339)
Net in service	4,641,039	4,671,500
Nuclear fuel, at amortized cost	377,593	377,653
Construction work in progress	3,401,701	3,228,214
Total electric plant	8,420,333	8,277,367
Investments and funds:
Nuclear decommissioning trust fund	400,022	386,029
Investment in associated companies	73,503	72,783
Long-term investments	106,444	99,874
Restricted investments	184,132	221,122
Other	21,045	20,730
Total investments and funds	785,146	800,538
Current assets:
Cash and cash equivalents	278,551	366,290
Restricted short-term investments	247,009	247,006
Receivables	149,359	155,042
Inventories, at average cost	271,859	259,831
Prepayments and other current assets	24,181	32,919
Total current assets	970,959	1,061,088
Deferred charges:
Regulatory assets	564,314	545,387
Other	15,476	16,733
Total deferred charges	579,790	562,120
Total assets	10,756,228	10,701,113
Capitalization:
Patronage capital and membership fees	881,264	859,810
Accumulated other comprehensive margin	(409)	(370)
Total patronage capital and membership fees and accumulated other comprehensive margin	880,855	859,440
Long-term debt	7,876,337	7,892,836
Obligations under capital lease	92,096	92,096
Other	19,081	18,765
Total capitalization	8,868,369	8,863,137
Current liabilities:
Long-term debt and capital lease due within one year	153,305	316,861
Short-term borrowings	328,890	102,168
Accounts payable	93,300	73,801
Accrued interest	58,342	93,634
Member power bill prepayments, current	173,705	176,988
Other current liabilities	42,713	59,979
Total current liabilities	850,255	823,431
Deferred credits and other liabilities:
Asset retirement obligations	706,913	698,051
Member power bill prepayments, non-current	53,115	48,115
Contract retainage	40,374	40,008
Regulatory liabilities	205,603	197,748
Other	31,599	30,623
Total deferred credits and other liabilities	1,037,604	1,014,545
Total equity and liabilities	$ 10,756,228	$ 10,701,113