CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 4,495	$ 7,635
Accounts receivable, net	251,750	322,885
Accounts receivable from affiliates	45,958	50,842
Investments in utility money pool arrangement	0	16,000
Accrued unbilled revenues	213,328	294,049
Inventories	198,665	238,979
Regulatory assets	97,362	120,120
Deferred income taxes	124,005	64,587
Derivative instruments	1,751	1,731
Prepaid taxes	19,519	90,365
Prepayments and other	21,871	23,979
Total current assets	978,704	1,231,172
Property, plant and equipment, net	11,796,866	11,626,956
Other assets
Regulatory assets	906,030	903,973
Derivative instruments	4,319	5,176
Other	47,614	48,506
Total other assets	957,963	957,655
Total assets	13,733,533	13,815,783
Current liabilities
Current portion of long-term debt	8,666	8,178
Short-term Debt	53,000	382,000
Accounts payable	271,780	425,133
Accounts payable to affiliates	32,756	46,736
Regulatory liabilities	187,945	134,459
Taxes accrued	92,626	159,470
Accrued interest	49,425	48,409
Dividends payable to parent	82,871	83,652
Derivative instruments	5,967	5,774
Other	69,737	72,002
Total current liabilities	854,773	1,365,813
Deferred credits and other liabilities
Deferred income taxes	2,587,936	2,437,641
Deferred investment tax credits	34,806	36,273
Regulatory liabilities	462,737	464,421
Asset retirement obligations	229,998	225,296
Derivative instruments	15,629	18,257
Customer advances	213,089	229,990
Pension and employee benefit obligations	180,017	202,031
Other	68,031	68,171
Total deferred credits and other liabilities	$ 3,792,243	$ 3,682,080
Commitments and contingencies
Capitalization
Long-term debt	$ 4,127,235	$ 3,882,051
Common stock — 100 shares authorized at $0.01 par value; 100 shares outstanding at June 30, 2015 and Dec. 31, 2014, respectively	0	0
Additional paid in capital	3,550,495	3,522,788
Retained earnings	1,432,873	1,386,929
Accumulated other comprehensive loss	(24,086)	(23,878)
Total common stockholder’s equity	4,959,282	4,885,839
Total liabilities and equity	$ 13,733,533	$ 13,815,783