CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 23,673	$ 7,513
Accounts receivable, net	312,526	294,403
Accounts receivable from affiliates	9,446	14,719
Investments in utility money pool arrangement	0	20,000
Accrued unbilled revenues	237,432	295,801
Inventories	153,926	214,489
Regulatory assets	68,164	77,337
Derivative instruments	4,897	3,197
Prepayments and other	34,390	35,720
Total current assets	844,454	963,179
Property, plant and equipment, net	14,291,475	14,025,751
Other assets
Regulatory assets	945,739	950,258
Derivative instruments	1,093	1,009
Other	24,494	27,429
Total other assets	971,326	978,696
Total assets	16,107,255	15,967,626
Current liabilities
Current portion of long-term debt	305,721	305,577
Short-term debt	95,000	0
Borrowings Payable Under Utility Money Pool Arrangement	48,000	0
Accounts payable	430,515	492,829
Accounts payable to affiliates	38,830	58,749
Regulatory liabilities	79,080	66,126
Taxes accrued	249,359	222,517
Accrued interest	33,640	48,552
Dividends payable to parent	95,351	76,195
Derivative instruments	7,344	7,348
Other	82,041	92,333
Total current liabilities	1,464,881	1,370,226
Deferred credits and other liabilities
Deferred income taxes	1,661,220	1,644,476
Deferred investment tax credits	27,158	27,858
Regulatory liabilities	1,943,401	1,933,488
Asset retirement obligations	351,379	347,769
Derivative instruments	2,367	3,468
Customer Advances for Construction	170,262	162,614
Pension and employee benefit obligations	264,668	287,783
Other	52,819	58,923
Total deferred credits and other liabilities	4,473,274	4,466,379
Commitments and contingencies
Capitalization
Long-term debt	4,302,104	4,302,698
Common stock — 100 shares authorized at $0.01 par value; 100 shares outstanding at March 31, 2018 and Dec. 31, 2017, respectively	0	0
Additional paid in capital	4,032,826	4,032,826
Retained earnings	1,860,600	1,822,229
Accumulated other comprehensive loss	(26,430)	(26,732)
Total common stockholder’s equity	5,866,996	5,828,323
Total liabilities and equity	$ 16,107,255	$ 15,967,626