Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Electric plant:
In service	$ 8,630,779	$ 8,596,148
Less: Accumulated provision for depreciation	(3,968,968)	(3,925,838)
Total in service	4,661,811	4,670,310
Nuclear fuel, at amortized cost	387,207	373,145
Construction work in progress	2,958,677	2,868,669
Total electric plant	8,007,695	7,912,124
Investments and funds:
Nuclear decommissioning trust fund	369,441	363,829
Investment in associated companies	73,197	72,010
Long-term investments	90,470	86,771
Restricted cash and investments, noncurrent	144,109	134,690
Other	19,394	19,097
Total investments and funds	696,611	676,397
Current assets:
Cash and cash equivalents	111,093	213,038
Restricted short-term investments	250,541	253,204
Receivables	126,420	130,464
Inventories, at average cost	293,999	299,252
Prepayments and other current assets	16,640	16,913
Total current assets	798,693	912,871
Deferred charges:
Regulatory assets	554,494	530,254
Other	22,910	28,137
Total deferred charges	577,404	558,391
Total assets	10,080,403	10,059,783
Capitalization:
Patronage capital and membership fees	830,063	809,465
Accumulated other comprehensive margin	342	58
Total patronage capital and membership fees and accumulated other comprehensive margin	830,405	809,523
Long-term debt	7,403,407	7,291,154
Obligations under capital leases	96,501	96,501
Other	17,857	17,561
Total capitalization	8,348,170	8,214,739
Current liabilities:
Long-term debt and capital leases due within one year	189,938	189,840
Short-term borrowings	303,020	261,478
Accounts payable	44,241	157,432
Accrued interest	53,302	58,830
Members power bill prepayments, current	173,004	174,743
Other current liabilities	56,566	86,746
Total current liabilities	820,071	929,069
Deferred credits and other liabilities:
Asset retirement obligations	599,631	602,230
Member power bill prepayments, non-current	39,165	44,205
Contract retainage	62,552	66,515
Regulatory liabilities	177,351	166,967
Other	33,463	36,058
Total deferred credits and other liabilities	912,162	915,975
Total equity and liabilities	$ 10,080,403	$ 10,059,783