BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 731	$ 596
Accounts receivable, net	95,928	71,626
Accounts receivable from affiliates	2,097	1,983
Accrued unbilled revenues	111,001	129,287
Inventories	39,880	43,231
Regulatory assets	34,467	52,006
Derivative instruments	15,252	23,776
Deferred income taxes	79,368	51,854
Prepayments and other	46,065	31,476
Total current assets	424,789	405,835
Property, plant and equipment, net	4,061,619	3,743,141
Other assets
Regulatory assets	307,811	323,305
Derivative instruments	27,245	33,164
Other	15,977	15,859
Total other assets	351,033	372,328
Total assets	4,837,441	4,521,304
Current liabilities
Short-term debt	0	37,000
Borrowings under utility money pool arrangement	18,000	16,000
Accounts payable	153,144	160,762
Accounts payable to affiliates	17,169	19,790
Regulatory liabilities	115,925	87,723
Taxes accrued	35,772	27,208
Accrued interest	29,550	17,057
Dividends payable	24,352	27,828
Derivative instruments	3,565	3,565
Other	96,378	80,211
Total current liabilities	493,855	477,144
Deferred credits and other liabilities
Deferred income taxes	912,343	849,145
Regulatory liabilities	94,799	115,188
Asset retirement obligations	27,061	26,031
Derivative instruments	27,969	30,643
Pension and employee benefit obligations	93,640	103,670
Other	10,179	9,320
Total deferred credits and other liabilities	$ 1,165,991	$ 1,133,997
Commitments and contingencies
Capitalization
Long-term debt	$ 1,550,537	$ 1,349,691
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at Sept. 30, 2015 and Dec. 31, 2014, respectively	0	0
Additional paid in capital	1,199,998	1,165,463
Retained earnings	427,920	395,998
Accumulated other comprehensive loss	(860)	(989)
Total common stockholder’s equity	1,627,058	1,560,472
Total liabilities and equity	$ 4,837,441	$ 4,521,304