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Electric utility segment (Details 11) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income (loss) $ 39,486 $ 48,707 $ 41,061 $ 34,152 $ 14,309 $ 48,177 $ 39,273 $ 38,789 $ 163,406 $ 140,548 $ 140,120  
Depreciation of property, plant and equipment                 160,061 150,389 148,152  
Other amortization                 4,667 7,958 19,318  
Impairment of utility plant                 0 40,000 9,215  
Increase in deferred income taxes                 80,399 90,848 79,444  
Allowance for equity funds used during construction                 (5,561) (7,007) (5,964)  
Change in cash overdraft                 1,038 0 (2,688)  
Decrease (increase) in fuel oil stock                 27,332 10,129 (18,843)  
Increase in regulatory assets                 (65,461) (72,401) (40,132)  
Change in prepaid and accrued income taxes and revenue taxes                 (19,406) 21,079 73,153  
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability                 (33,014) (228) (6,922)  
Net cash provided by operating activities                 327,146 234,542 250,366  
Capital expenditures                 (353,879) (325,480) (235,116)  
Contributions in aid of construction                 32,160 45,982 23,534  
Other                 3,516 2,677 (2,974)  
Net cash used in investing activities                 (563,760) (427,047) (326,787)  
Common stock dividends                 (98,383) (96,202) (106,812)  
Proceeds from issuance of long-term debt                 286,000 457,000 125,000  
Proceeds from issuance of common stock                 55,086 23,613 15,979  
Repayment of long-term debt                 (216,000) (375,500) (150,000)  
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less                 21,789 14,872 43,898  
Other                 (1,187) (2,645) (710)  
Net cash provided by (used in) financing activities                 236,988 141,902 16,035  
Net increase (decrease) in cash and cash equivalents                 374 (50,603) (60,386)  
HECO
                        
Net income (loss)                 124,009 100,356 101,066  
Equity in earnings                 (41,510) (28,936) (44,716)  
Common stock dividends received from subsidiaries                 28,505 47,035 28,228  
Depreciation of property, plant and equipment                 99,738 90,783 89,324  
Other amortization                 554 1,508 9,890  
Impairment of utility plant                   29,000 9,215  
Increase in deferred income taxes                 41,409 66,968 38,548  
Change in tax credits, net                 5,152 5,006 1,464  
Allowance for equity funds used during construction                 (4,495) (5,735) (4,572)  
Decrease (increase) in accounts receivable                 49,974 (48,451) (34,167)  
Decrease (increase) in accrued unbilled revenues                 (7,152) 2,728 (31,616)  
Decrease (increase) in fuel oil stock                 23,563 4,861 (6,757)  
Increase in materials and supplies                 (5,598) (6,683) (6,206)  
Increase in regulatory assets                 (46,047) (55,605) (31,774)  
Increase (decrease) in accounts payable                 (6,136) (31,743) (34,515)  
Change in prepaid and accrued income taxes and revenue taxes                 4,632 19,871 51,593  
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability                 2,325 (434) (20,439)  
Changes in other assets and liabilities                 (17,941) (44,880) (17,432)  
Net cash provided by operating activities                 250,982 145,649 97,134  
Capital expenditures                 (237,899) (233,792) (160,528)  
Contributions in aid of construction                 21,686 32,285 15,003  
Advances from affiliates                 2,561 (9,400) 0  
Other                 0   77  
Investment in consolidated subsidiary                 (12,461)   (25)  
Net cash used in investing activities                 (226,113) (210,907) (145,473)  
Common stock dividends                 (81,578) (73,044) (70,558)  
Preferred stock dividends of Hawaiian Electric and subsidiaries                 (1,080) (1,080) (1,080)  
Proceeds from issuance of long-term debt                 140,000 367,000    
Proceeds from issuance of common stock                 78,500 44,000 40,000  
Repayment of long-term debt                 (90,000) (259,580)    
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less                 (17,050) (46,600) 4,200  
Other                 (681) (1,992) (423)  
Net cash provided by (used in) financing activities                 28,111 28,704 (27,861)  
Net increase (decrease) in cash and cash equivalents                 52,980 (36,554) (76,200)  
Cash and cash equivalents 61,245       8,265       61,245 8,265 44,819 121,019
HELCO
                        
Net income (loss)                 20,670 16,746 27,185  
Depreciation of property, plant and equipment                 34,188 33,337 32,767  
Other amortization                 1,979 3,252 2,528  
Impairment of utility plant                   5,500    
Increase in deferred income taxes                 10,569 7,457 16,101  
Change in tax credits, net                 818 522 117  
Allowance for equity funds used during construction                 (643) (585) (592)  
Change in cash overdraft                     (2,527)  
Decrease (increase) in accounts receivable                 (1,459) (1,106) (2,985)  
Decrease (increase) in accrued unbilled revenues                 (2,707) 4,106 (2,481)  
Decrease (increase) in fuel oil stock                 1,307 3,732 (3,466)  
Increase in materials and supplies                 (1,547) (636) (202)  
Increase in regulatory assets                 (9,237) (9,649) (2,025)  
Increase (decrease) in accounts payable                 (4,756) (8,110) 4,391  
Change in prepaid and accrued income taxes and revenue taxes                 (4,114) 1,935 9,641  
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability                 (1) (191) (3,241)  
Changes in other assets and liabilities                 (6,262) (11,143) (13,124)  
Net cash provided by operating activities                 38,805 45,167 62,087  
Capital expenditures                 (52,135) (41,060) (34,230)  
Contributions in aid of construction                 7,590 8,184 6,271  
Advances from affiliates                 17,050 28,100 (15,200)  
Other                 (230)      
Net cash used in investing activities                 (27,725) (4,776) (43,159)  
Common stock dividends                 (14,388) (27,738) (16,124)  
Preferred stock dividends of Hawaiian Electric and subsidiaries                 (534) (534) (534)  
Proceeds from issuance of long-term debt                 56,000 31,000    
Proceeds from issuance of common stock                     0  
Repayment of long-term debt                 (56,000) (41,200)    
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less                     0  
Other                 (273) 139 (116)  
Net cash provided by (used in) financing activities                 (15,195) (38,333) (16,774)  
Net increase (decrease) in cash and cash equivalents                 (4,115) 2,058 2,154  
Cash and cash equivalents 1,326       5,441       1,326 5,441 3,383 1,229
MECO
                        
Net income (loss)                 21,658 13,008 18,355  
Depreciation of property, plant and equipment                 20,099 20,378 20,884  
Other amortization                 2,544 2,238 4,960  
Impairment of utility plant                   5,500    
Increase in deferred income taxes                 12,529 12,453 14,442  
Change in tax credits, net                 1,047 547 506  
Allowance for equity funds used during construction                 (423) (687) (800)  
Change in cash overdraft                 1,038   (161)  
Decrease (increase) in accounts receivable                 1,178 (2,164) (5,663)  
Decrease (increase) in accrued unbilled revenues                 33 (3,306) 655  
Decrease (increase) in fuel oil stock                 2,462 1,536 (8,620)  
Increase in materials and supplies                 (814) (578) (63)  
Increase in regulatory assets                 (10,177) (7,147) (6,333)  
Increase (decrease) in accounts payable                 (9,936) 940 (5,691)  
Change in prepaid and accrued income taxes and revenue taxes                 (2,546) 3,433 8,502  
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability                 (84) (119) (3,324)  
Changes in other assets and liabilities                 (7,544) (12,678) (7,337)  
Net cash provided by operating activities                 31,064 33,354 30,312  
Capital expenditures                 (52,451) (35,239) (31,264)  
Contributions in aid of construction                 2,884 5,513 2,260  
Advances from affiliates                 0 18,500 11,000  
Other                 0      
Net cash used in investing activities                 (49,567) (11,226) (18,004)  
Common stock dividends                 (14,017) (19,197) (12,004)  
Preferred stock dividends of Hawaiian Electric and subsidiaries                 (381) (381) (381)  
Proceeds from issuance of long-term debt                 40,000 59,000    
Proceeds from issuance of common stock                 12,461   0  
Repayment of long-term debt                 (20,000) (67,720)    
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less                 (2,561) 9,400    
Other                 (195) (377) (21)  
Net cash provided by (used in) financing activities                 15,307 (19,275) (12,406)  
Net increase (decrease) in cash and cash equivalents                 (3,196) 2,853 (98)  
Cash and cash equivalents 153       3,349       153 3,349 496 594
RHI
                        
Net income (loss)                 (3) (3) (9)  
Changes in other assets and liabilities                 0 (1) (2)  
Net cash provided by operating activities                 (3) (4) (11)  
Proceeds from issuance of common stock                     25  
Net cash provided by (used in) financing activities                     25  
Net increase (decrease) in cash and cash equivalents                 (3) (4) 14  
Cash and cash equivalents 101       104       101 104 108 94
Consolidating adjustments
                        
Net income (loss)                 (41,410) (28,836) (44,616)  
Equity in earnings                 41,410 28,836 44,616  
Common stock dividends received from subsidiaries                 (28,405) (46,935) (28,128)  
Decrease (increase) in accounts receivable                 (248) 4,717 (1,589)  
Changes in other assets and liabilities                 248 (4,717) 1,589  
Net cash provided by operating activities                 (28,405) (46,935) (28,128)  
Advances from affiliates                 (19,611) (37,200) 4,200  
Other                 0      
Investment in consolidated subsidiary                 12,461   25  
Net cash used in investing activities                 (7,150) (37,200) 4,225  
Common stock dividends                 28,405 46,935 28,128  
Proceeds from issuance of common stock                 (12,461)   (25)  
Net increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less                 19,611 37,200 (4,200)  
Net cash provided by (used in) financing activities                 35,555 84,135 23,903  
HECO Consolidated
                        
Net income (loss) 32,489 38,315 29,192 24,928 4,724 38,873 29,875 27,799 124,924 101,271 101,981  
Equity in earnings                 (100) (100) (100)  
Common stock dividends received from subsidiaries                 100 100 100  
Depreciation of property, plant and equipment                 154,025 144,498 142,975  
Other amortization                 5,077 6,998 17,378  
Impairment of utility plant                 0 40,000 9,215  
Increase in deferred income taxes                 64,507 86,878 69,091  
Change in tax credits, net                 7,017 6,075 2,087  
Allowance for equity funds used during construction                 (5,561) (7,007) (5,964)  
Change in cash overdraft                 1,038 0 (2,688)  
Decrease (increase) in accounts receivable                 49,445 (47,004) (44,404)  
Decrease (increase) in accrued unbilled revenues                 (9,826) 3,528 (33,442)  
Decrease (increase) in fuel oil stock                 27,332 10,129 (18,843)  
Increase in materials and supplies                 (7,959) (7,897) (6,471)  
Increase in regulatory assets                 (65,461) (72,401) (40,132)  
Increase (decrease) in accounts payable                 (20,828) (38,913) (35,815)  
Change in prepaid and accrued income taxes and revenue taxes                 (2,028) 25,239 69,736  
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability                 2,240 (744) (27,004)  
Changes in other assets and liabilities                 (31,499) (73,419) (36,306)  
Net cash provided by operating activities                 292,443 177,231 161,394  
Capital expenditures                 (342,485) (310,091) (226,022)  
Contributions in aid of construction                 32,160 45,982 23,534  
Other                 (230) 0 77  
Net cash used in investing activities                 (310,555) (264,109) (202,411)  
Common stock dividends                 (81,578) (73,044) (70,558)  
Preferred stock dividends of Hawaiian Electric and subsidiaries                 (1,995) (1,995) (1,995)  
Proceeds from issuance of long-term debt                 236,000 457,000 0  
Proceeds from issuance of common stock                 78,500 44,000 40,000  
Repayment of long-term debt                 (166,000) (368,500) 0  
Other                 (1,149) (2,230) (560)  
Net cash provided by (used in) financing activities                 63,778 55,231 (33,113)  
Net increase (decrease) in cash and cash equivalents                 45,666 (31,647) (74,130)  
Cash and cash equivalents $ 62,825       $ 17,159       $ 62,825 $ 17,159 $ 48,806 $ 122,936