BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 490	$ 834
Accounts receivable, net	73,460	71,166
Accounts receivable from affiliates	1,200	1,079
Accrued unbilled revenues	102,429	103,781
Inventories	31,271	37,546
Regulatory assets	27,332	31,541
Derivative instruments	8,439	12,952
Deferred income taxes	46,109	35,686
Prepaid taxes	48,253	35,666
Prepayments and other	20,360	20,520
Total current assets	359,343	350,771
Property, plant and equipment, net	4,440,167	4,348,823
Other assets
Regulatory assets	299,862	301,814
Derivative instruments	24,482	25,272
Other	4,101	3,449
Total other assets	328,445	330,535
Total assets	5,127,955	5,030,129
Current liabilities
Current portion of long-term debt	200,000	200,000
Short-term debt	80,000	15,000
Accounts payable	133,335	146,794
Accounts payable to affiliates	17,992	29,135
Regulatory liabilities	95,436	98,305
Taxes accrued	27,314	33,374
Accrued interest	29,619	17,781
Dividends payable	25,645	12,538
Derivative instruments	3,565	3,565
Other	31,430	35,654
Total current liabilities	644,336	592,146
Deferred credits and other liabilities
Deferred income taxes	931,686	896,430
Regulatory liabilities	235,300	229,584
Asset retirement obligations	27,588	27,233
Derivative instruments	26,187	27,078
Pension and employee benefit obligations	75,997	93,346
Other	18,137	17,841
Total deferred credits and other liabilities	$ 1,314,895	$ 1,291,512
Commitments and contingencies
Capitalization
Long-term debt	$ 1,338,842	$ 1,338,522
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at March 31, 2016 and Dec. 31, 2015, respectively	0	0
Additional paid in capital	1,396,223	1,371,223
Retained earnings	434,886	438,007
Accumulated other comprehensive loss	(1,227)	(1,281)
Total common stockholder’s equity	1,829,882	1,807,949
Total liabilities and equity	$ 5,127,955	$ 5,030,129