CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 53,696	$ 42,605
Accounts receivable, net	332,976	292,806
Accounts receivable from affiliates	23,188	32,850
Accrued unbilled revenues	186,780	227,102
Inventories	308,578	343,916
Regulatory assets	178,943	187,793
Derivative instruments	12,638	18,941
Deferred income taxes	34,561	15,577
Prepayments and other	102,220	89,559
Total current assets	1,233,580	1,251,149
Property, plant and equipment, net	12,828,607	12,807,338
Other assets
Nuclear decommissioning fund and other investments	1,769,992	1,758,208
Regulatory assets	1,199,305	1,159,217
Derivative instruments	28,038	22,334
Other	1,428	1,385
Total other assets	2,998,763	2,941,144
Total assets	17,060,950	16,999,631
Current liabilities
Current portion of long-term debt	11	11
Short-term debt	73,000	223,000
Borrowings under utility money pool arrangement	93,000	0
Accounts payable	298,918	350,660
Accounts payable to affiliates	54,889	59,785
Regulatory liabilities	50,435	43,920
Taxes accrued	282,379	225,361
Accrued interest	47,122	66,979
Dividends payable to parent	82,228	73,498
Derivative instruments	18,239	17,211
Customer Deposits, Current	78,477	94,388
Other	142,440	177,795
Total current liabilities	1,221,138	1,332,608
Deferred credits and other liabilities
Deferred income taxes	2,637,057	2,572,087
Deferred investment tax credits	25,418	25,838
Regulatory liabilities	506,044	491,887
Asset retirement obligations	2,359,476	2,331,092
Derivative instruments	129,383	128,213
Pension and employee benefit obligations	290,885	339,663
Other	139,409	114,768
Total deferred credits and other liabilities	$ 6,087,672	$ 6,003,548
Commitments and contingencies
Capitalization
Long-term debt	$ 4,497,432	$ 4,496,410
Common stock — authorized 5,000,000 shares of $0.01 par value; 1,000,000 shares outstanding at March 31, 2016 and Dec. 31, 2015, respectively	10	10
Additional paid in capital	3,398,810	3,323,810
Retained earnings	1,876,728	1,864,326
Accumulated other comprehensive loss	(20,840)	(21,081)
Total common stockholder’s equity	5,254,708	5,167,065
Total liabilities and equity	$ 17,060,950	$ 16,999,631