CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 10,634	$ 21,089
Accounts receivable, net	272,651	328,675
Accounts receivable from affiliates	20,091	19,136
Investments in utility money pool arrangement	0	72,000
Accrued unbilled revenues	212,160	270,917
Inventories	264,416	238,007
Regulatory assets	108,033	150,163
Deferred income taxes	78,243	87,267
Derivative instruments	7,166	6,576
Prepayments and other	31,628	32,629
Total current assets	1,005,022	1,226,459
Property, plant and equipment, net	11,313,360	10,742,397
Other assets
Regulatory assets	839,823	826,037
Derivative instruments	5,605	6,905
Other	48,955	52,520
Total other assets	894,383	885,462
Total assets	13,212,765	12,854,318
Current liabilities
Current portion of long-term debt	7,854	282,143
Short-term Debt	253,000	0
Borrowings Payable Under Utility Money Pool Arrangement	11,000	0
Accounts payable	360,768	451,243
Accounts payable to affiliates	32,789	45,902
Regulatory liabilities	120,842	79,499
Taxes accrued	133,609	154,194
Accrued interest	24,243	48,492
Dividends payable to parent	78,241	65,134
Derivative instruments	5,190	6,734
Other	74,529	89,571
Total current liabilities	1,102,065	1,222,912
Deferred credits and other liabilities
Deferred income taxes	2,338,296	2,206,179
Deferred investment tax credits	37,011	39,230
Regulatory liabilities	470,746	424,690
Asset retirement obligations	98,961	60,398
Derivative instruments	19,546	23,366
Customer advances	236,014	251,062
Pension and employee benefit obligations	129,358	167,127
Other	65,903	66,855
Total deferred credits and other liabilities	3,395,835	3,238,907
Commitments and contingencies
Capitalization
Long-term debt	3,884,051	3,590,500
Common stock — 100 shares authorized at $0.01 par value; 100 shares outstanding at Sept. 30, 2014 and Dec. 31, 2013, respectively	0	0
Additional paid in capital	3,476,776	3,441,290
Retained earnings	1,377,747	1,384,047
Accumulated other comprehensive loss	(23,709)	(23,338)
Total common stockholder’s equity	4,830,814	4,801,999
Total liabilities and equity	$ 13,212,765	$ 12,854,318