Consolidated Balance Sheets - HECO (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other long-term assets
Total assets	$ 10,298,569	$ 10,149,132
Capitalization
Retained earnings	220,049	216,804
Accumulated other comprehensive loss, net of income taxes-retirement benefit plans	(35,716)	(36,424)
Cumulative preferred stock - not subject to mandatory redemption
Commitments and contingencies (Note 5)
Current liabilities
Interest and preferred dividends payable	26,358	26,258
Deferred credits and other liabilities
Deferred income taxes	459,249	439,329
Contributions in aid of construction	415,795	405,520
Total liabilities and shareholders' equity	10,298,569	10,149,132
Hawaiian Electric Company, Inc. and Subsidiaries
Utility plant, at cost
Land	51,598	51,568
Plant and equipment	5,427,933	5,364,400
Less accumulated depreciation	(2,062,810)	(2,040,789)
Construction in progress	153,669	151,378
Net utility plant	3,570,390	3,526,557
Current assets
Cash and cash equivalents	36,940	17,159
Customer accounts receivable, net	194,457	210,779
Accrued unbilled revenues, net	135,615	134,298
Other accounts receivable, net	5,795	28,176
Fuel oil stock, at average cost	190,691	161,419
Materials and supplies, at average cost	54,430	51,085
Prepayments and other	32,255	32,865
Regulatory assets	61,804	51,267
Total current assets	711,987	687,048
Other long-term assets
Regulatory assets	812,347	813,329
Unamortized debt expense	10,245	10,554
Other	69,266	71,305
Total other long-term assets	891,858	895,188
Total assets	5,174,235	5,108,793
Capitalization
Common stock ($6 2/3 par value, authorized 50,000,000 shares; outstanding 14,665,264 shares)	97,788	97,788
Premium on capital stock	468,045	468,045
Retained earnings	911,632	907,273
Accumulated other comprehensive loss, net of income taxes-retirement benefit plans	(952)	(970)
Common stock equity	1,476,513	1,472,136
Cumulative preferred stock - not subject to mandatory redemption	34,293	34,293
Long-term debt, net	1,147,875	1,147,872
Total capitalization	2,658,681	2,654,301
Commitments and contingencies (Note 5)
Current liabilities
Short-term borrowings from nonaffiliates	43,052
Accounts payable	228,426	186,824
Interest and preferred dividends payable	21,693	21,092
Taxes accrued	199,350	251,066
Other	67,930	62,879
Total current liabilities	560,451	521,861
Deferred credits and other liabilities
Deferred income taxes	435,598	417,611
Regulatory liabilities	325,527	322,074
Unamortized tax credits	67,939	66,584
Retirement benefits liability	611,678	620,205
Other	98,566	100,637
Total deferred credits and other liabilities	1,539,308	1,527,111
Contributions in aid of construction	415,795	405,520
Total liabilities and shareholders' equity	$ 5,174,235	$ 5,108,793