Consolidated Statements of Cash Flows - HECO (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net income	$ 140,120	$ 115,425	$ 84,901
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of utility plant	148,152	154,523	151,282
Other amortization	19,318	4,605	5,389
Impairment of utility plant	9,215
Changes in deferred income taxes	79,444	97,791	12,787
Allowance for equity funds used during construction	(5,964)	(6,016)	(12,222)
Change in cash overdraft	(2,688)	(141)
Changes in assets and liabilities
Increase in fuel oil stock	(18,843)	(74,044)	(946)
Changes in prepaid and accrued income taxes and revenue taxes	73,153	(5,252)	(61,977)
Contributions to defined benefit pension and other postretirement benefit plans	(74,961)	(31,792)	(25,354)
Other	(26,094)	36,270	(39,491)
Net cash provided by operating activities	250,366	340,717	268,586
Cash flows from investing activities
Capital expenditures	(235,116)	(182,125)	(288,879)
Contributions in aid of construction	23,534	22,555	14,170
Other	(2,974)	5,092	1,199
Net cash used in investing activities	(326,787)	(278,734)	457,508
Cash flows from financing activities
Common stock dividends	(106,812)	(93,034)	(96,843)
Proceeds from issuance of common stock	15,979	22,706	15,329
Proceeds from issuance of long-term debt	125,000		153,186
Net increase (decrease) in short-term borrowings from nonaffiliates and affiliate with original maturities of three months or less	43,898	(17,066)	41,989
Decrease in cash overdraft			(9,545)
Other	(675)	(2,229)	(2,762)
Net cash provided by (used in) financing activities	16,035	(235,254)	(405,607)
Net increase (decrease) in cash and cash equivalents	(60,386)	(173,271)	320,487
Hawaiian Electric Company, Inc. and Subsidiaries
Cash flows from operating activities
Net income	101,981	78,584	81,441
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation of utility plant	142,975	149,708	144,533
Other amortization	17,378	7,725	10,045
Impairment of utility plant	9,215
Changes in deferred income taxes	69,091	95,685	14,762
Changes in tax credits, net	2,087	2,841	(1,332)
Allowance for equity funds used during construction	(5,964)	(6,016)	(12,222)
Change in cash overdraft	(2,688)	(141)
Changes in assets and liabilities
Decrease (increase) in accounts receivable	(44,404)	(5,812)	32,605
Decrease (increase) in accrued unbilled revenues	(33,442)	(20,108)	22,268
Increase in fuel oil stock	(18,843)	(74,044)	(946)
Increase in materials and supplies	(6,471)	(809)	(1,376)
Increase in regulatory assets	(40,132)	(2,936)	(17,597)
Increase (decrease) in accounts payable	(35,815)	25,392	(6,165)
Changes in prepaid and accrued income taxes and revenue taxes	69,736	(10,170)	(61,951)
Contributions to defined benefit pension and other postretirement benefit plans	(73,176)	(31,068)	(24,086)
Other	9,866	38,958	21,515
Net cash provided by operating activities	161,394	247,789	201,494
Cash flows from investing activities
Capital expenditures	(226,022)	(174,344)	(286,445)
Contributions in aid of construction	23,534	22,555	14,170
Other	77	1,327	340
Net cash used in investing activities	(202,411)	(150,462)	(271,935)
Cash flows from financing activities
Common stock dividends	(70,558)	(48,769)	(55,000)
Preferred stock dividends of HECO and subsidiaries	(1,995)	(1,995)	(1,995)
Proceeds from issuance of common stock	40,000	4,250	61,914
Proceeds from issuance of long-term debt			153,186
Net increase (decrease) in short-term borrowings from nonaffiliates and affiliate with original maturities of three months or less			(10,464)
Decrease in cash overdraft			(9,545)
Other	(560)	(1,455)	(978)
Net cash provided by (used in) financing activities	(33,113)	(47,969)	137,118
Net increase (decrease) in cash and cash equivalents	(74,130)	49,358	66,677
Cash and cash equivalents, January 1	122,936	73,578	6,901
Cash and cash equivalents, December 31	$ 48,806	$ 122,936	$ 73,578