CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 73,985	$ 84,476
Accounts receivable, net	781,248	776,289
Accrued unbilled revenues	555,445	729,832
Inventories	519,081	604,226
Regulatory assets	360,309	363,655
Derivative instruments	20,885	38,224
Prepaid taxes	176,998	106,697
Prepayments and other	145,203	138,682
Total current assets	2,633,154	2,842,081
Property, plant and equipment, net	33,158,384	32,841,750
Other assets
Nuclear decommissioning fund and other investments	2,187,946	2,091,858
Regulatory assets	3,009,825	3,080,867
Derivative instruments	48,681	50,189
Other	247,351	248,532
Total other assets	5,493,803	5,471,446
Total assets	41,285,341	41,155,277
Current liabilities
Current portion of long-term debt	755,448	255,529
Short-term debt	605,000	392,000
Accounts payable	861,506	1,044,959
Regulatory liabilities	186,926	220,894
Taxes accrued	544,177	457,392
Accrued interest	151,929	172,901
Dividends payable	182,795	172,456
Derivative instruments	26,706	26,959
Other	393,489	503,953
Total current liabilities	3,707,976	3,247,043
Deferred credits and other liabilities
Deferred income taxes	6,999,546	6,784,319
Deferred investment tax credits	61,937	63,216
Regulatory liabilities	1,400,234	1,383,212
Asset retirement obligations	2,815,677	2,782,229
Derivative instruments	143,684	148,146
Customer advances	189,984	195,214
Pension and employee benefit obligations	964,398	1,112,366
Other	235,333	223,965
Total deferred credits and other liabilities	12,810,793	12,692,667
Commitments and contingencies
Capitalization
Long-term debt	13,696,461	14,194,718
Common stock — 1,000,000,000 shares authorized of $2.50 par value; 507,762,881 and 507,222,795 shares outstanding at March 31, 2017 and Dec. 31, 2016, respectively	1,269,407	1,268,057
Additional paid in capital	5,872,933	5,881,494
Retained earnings	4,036,352	3,981,652
Accumulated other comprehensive loss	(108,581)	(110,354)
Total common stockholders’ equity	11,070,111	11,020,849
Total liabilities and equity	$ 41,285,341	$ 41,155,277

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.