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Electric utility segment - Consolidating statement of cash flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities        
Net income $ 127,613 $ 51,144 $ 205,039 $ 118,974
Adjustments to reconcile net income to net cash provided by operating activities        
Depreciation of property, plant and equipment     145,684 137,721
Other amortization     7,368 7,252
Deferred income taxes     30,667 2,723
Allowance for equity funds used during construction (2,274) (2,057) (6,010) (5,366)
Impairment of utility assets     0 4,828
Other     3,234 3,921
Changes in assets and liabilities        
Decrease in fuel oil stock     6,736 35,942
Increase in regulatory assets     (2,251) (23,458)
Change in prepaid and accrued income and utility revenue taxes     52,558 (8,458)
Increase in defined benefit pension and other postretirement benefit plans liability     150 418
Net cash provided by operating activities     408,902 221,252
Cash flows from investing activities        
Capital expenditures     (259,207) (276,186)
Contributions in aid of construction     23,568 34,627
Other     112 4,084
Net cash used in investing activities     (535,744) (502,997)
Cash flows from financing activities        
Common stock dividends     (83,620) (98,452)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     (103,063) 53,020
Other     (4,759) (4,453)
Net cash provided by financing activities     110,719 334,620
Net increase (decrease) in cash and cash equivalents     (16,123) 52,875
Hawaiian Electric Company        
Cash flows from operating activities        
Net income 47,244 43,276 109,008 103,531
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in earnings of subsidiaries     (33,616) (29,249)
Common stock dividends received from subsidiaries     19,776 18,972
Depreciation of property, plant and equipment     94,564 88,167
Other amortization     2,462 2,029
Deferred income taxes     41,005 46,493
Tax credits, net     4,314 3,680
Allowance for equity funds used during construction (1,806) (1,714) (4,771) (4,418)
Impairment of utility assets       3,380
Other     (1,389) 221
Changes in assets and liabilities        
Decrease (increase) in accounts receivable     328 (4,226)
Increase in accrued unbilled revenues     (9,673) 6,283
Decrease in fuel oil stock     4,157 25,019
Increase in materials and supplies     (1,755) (759)
Increase in regulatory assets     (2,474) (19,138)
Decrease in accounts payable     (2,628) (34,476)
Change in prepaid and accrued income and utility revenue taxes     (7,324) (52,505)
Increase in defined benefit pension and other postretirement benefit plans liability     449 0
Change in other assets and liabilities     (10,548) (16,847)
Net cash provided by operating activities     201,885 136,157
Cash flows from investing activities        
Capital expenditures     (188,415) (204,406)
Contributions in aid of construction     18,181 30,153
Other     901 583
Advances from affiliates     0 4,100
Net cash used in investing activities     (169,333) (169,570)
Cash flows from financing activities        
Common stock dividends     (70,199) (67,804)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (810) (810)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     32,000 97,495
Other     (3) (219)
Net cash provided by financing activities     (39,012) 28,662
Net increase (decrease) in cash and cash equivalents     (6,460) (4,751)
Cash and cash equivalents, beginning of period     16,281 12,416
Cash and cash equivalents, end of period 9,821 7,665 9,821 7,665
HELCO        
Cash flows from operating activities        
Net income 7,437 4,322 16,886 12,861
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in earnings of subsidiaries     0 0
Common stock dividends received from subsidiaries     0 0
Depreciation of property, plant and equipment     28,347 27,938
Other amortization     1,366 1,331
Deferred income taxes     4,529 907
Tax credits, net     464 372
Allowance for equity funds used during construction (238) (148) (571) (458)
Impairment of utility assets       724
Other     (302) (286)
Changes in assets and liabilities        
Decrease (increase) in accounts receivable     (2,716) (2,071)
Increase in accrued unbilled revenues     (373) 3,696
Decrease in fuel oil stock     1,425 5,358
Increase in materials and supplies     (1,559) (1,615)
Increase in regulatory assets     (150) (3,944)
Decrease in accounts payable     143 (4,070)
Change in prepaid and accrued income and utility revenue taxes     2,230 (2,276)
Increase in defined benefit pension and other postretirement benefit plans liability     40 0
Change in other assets and liabilities     2,856 722
Net cash provided by operating activities     52,615 39,189
Cash flows from investing activities        
Capital expenditures     (37,835) (34,048)
Contributions in aid of construction     2,691 2,940
Other     169 124
Advances from affiliates     (3,000) 0
Net cash used in investing activities     (37,975) (30,984)
Cash flows from financing activities        
Common stock dividends     (9,906) (7,515)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (400) (400)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     0 1,500
Other     (8) (3)
Net cash provided by financing activities     (10,314) (6,418)
Net increase (decrease) in cash and cash equivalents     4,326 1,787
Cash and cash equivalents, beginning of period     2,682 612
Cash and cash equivalents, end of period 7,008 2,399 7,008 2,399
Maui Electric        
Cash flows from operating activities        
Net income 7,520 7,764 17,341 16,999
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in earnings of subsidiaries     0 0
Common stock dividends received from subsidiaries     0 0
Depreciation of property, plant and equipment     17,389 16,735
Other amortization     1,552 1,639
Deferred income taxes     10,085 10,497
Tax credits, net     478 195
Allowance for equity funds used during construction (230) (195) (668) (490)
Impairment of utility assets       724
Other     (331) (261)
Changes in assets and liabilities        
Decrease (increase) in accounts receivable     (1,313) 43
Increase in accrued unbilled revenues     (612) 3,817
Decrease in fuel oil stock     1,154 5,565
Increase in materials and supplies     387 651
Increase in regulatory assets     373 (376)
Decrease in accounts payable     1,809 (1,829)
Change in prepaid and accrued income and utility revenue taxes     (4,472) (6,540)
Increase in defined benefit pension and other postretirement benefit plans liability     (129) 331
Change in other assets and liabilities     (2,571) (2,563)
Net cash provided by operating activities     40,472 45,137
Cash flows from investing activities        
Capital expenditures     (24,454) (27,067)
Contributions in aid of construction     2,696 1,534
Other     30 71
Advances from affiliates     (8,000) (2,500)
Net cash used in investing activities     (29,728) (27,962)
Cash flows from financing activities        
Common stock dividends     (9,795) (11,382)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (286) (286)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     0 (5,600)
Other     (1) (1)
Net cash provided by financing activities     (10,082) (17,269)
Net increase (decrease) in cash and cash equivalents     662 (94)
Cash and cash equivalents, beginning of period     5,385 633
Cash and cash equivalents, end of period 6,047 539 6,047 539
Other subsidiaries        
Cash flows from operating activities        
Net income 0 0 0 0
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in earnings of subsidiaries     0 0
Common stock dividends received from subsidiaries     0 0
Depreciation of property, plant and equipment     0 0
Other amortization     0 0
Deferred income taxes     0 0
Tax credits, net     0 0
Allowance for equity funds used during construction 0 0 0 0
Other     0
Changes in assets and liabilities        
Decrease (increase) in accounts receivable     0 0
Increase in accrued unbilled revenues     0 0
Decrease in fuel oil stock     0 0
Increase in materials and supplies     0 0
Increase in regulatory assets     0 0
Decrease in accounts payable     0 0
Change in prepaid and accrued income and utility revenue taxes     0 0
Increase in defined benefit pension and other postretirement benefit plans liability     0 0
Change in other assets and liabilities     0 0
Net cash provided by operating activities     0 0
Cash flows from investing activities        
Capital expenditures     0 0
Contributions in aid of construction     0 0
Other     0 0
Advances from affiliates     0 0
Net cash used in investing activities     0 0
Cash flows from financing activities        
Common stock dividends     0 0
Preferred stock dividends of Hawaiian Electric and subsidiaries     0 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     0 0
Other     0 0
Net cash provided by financing activities     0 0
Net increase (decrease) in cash and cash equivalents     0 0
Cash and cash equivalents, beginning of period     101 101
Cash and cash equivalents, end of period 101 101 101 101
Consolidating adjustments        
Cash flows from operating activities        
Net income (14,729) (11,858) (33,541) (29,174)
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in earnings of subsidiaries     33,541 29,174
Common stock dividends received from subsidiaries     (19,701) (18,897)
Depreciation of property, plant and equipment     0 0
Other amortization     0 0
Deferred income taxes     29 314
Tax credits, net     0 0
Allowance for equity funds used during construction 0 0 0 0
Other     0
Changes in assets and liabilities        
Decrease (increase) in accounts receivable     3,046 1,790
Increase in accrued unbilled revenues     0 0
Decrease in fuel oil stock     0 0
Increase in materials and supplies     0 0
Increase in regulatory assets     0 0
Decrease in accounts payable     0 0
Change in prepaid and accrued income and utility revenue taxes     (29) (314)
Increase in defined benefit pension and other postretirement benefit plans liability     0 0
Change in other assets and liabilities     (3,046) (1,790)
Net cash provided by operating activities     (19,701) (18,897)
Cash flows from investing activities        
Capital expenditures     0 0
Contributions in aid of construction     0 0
Other     0 0
Advances from affiliates     11,000 (1,600)
Net cash used in investing activities     11,000 (1,600)
Cash flows from financing activities        
Common stock dividends     19,701 18,897
Preferred stock dividends of Hawaiian Electric and subsidiaries     0 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     (11,000) 1,600
Other     0 0
Net cash provided by financing activities     8,701 20,497
Net increase (decrease) in cash and cash equivalents     0 0
Cash and cash equivalents, beginning of period     0 0
Cash and cash equivalents, end of period 0 0 0 0
Hawaiian Electric Company, Inc. and Subsidiaries        
Cash flows from operating activities        
Net income 47,472 43,504 109,694 104,217
Adjustments to reconcile net income to net cash provided by operating activities        
Equity in earnings of subsidiaries     (75) (75)
Common stock dividends received from subsidiaries     75 75
Depreciation of property, plant and equipment     140,300 132,840
Other amortization     5,380 4,999
Deferred income taxes     55,648 58,211
Tax credits, net     5,256 4,247
Allowance for equity funds used during construction (2,274) (2,057) (6,010) (5,366)
Impairment of utility assets     0 4,828
Other     (2,022) (326)
Changes in assets and liabilities        
Decrease (increase) in accounts receivable     (655) (4,464)
Increase in accrued unbilled revenues     (10,658) 13,796
Decrease in fuel oil stock     6,736 35,942
Increase in materials and supplies     (2,927) (1,723)
Increase in regulatory assets     (2,251) (23,458)
Decrease in accounts payable     (676) (40,375)
Change in prepaid and accrued income and utility revenue taxes     (9,595) (61,635)
Increase in defined benefit pension and other postretirement benefit plans liability     360 331
Change in other assets and liabilities     (13,309) (20,478)
Net cash provided by operating activities     275,271 201,586
Cash flows from investing activities        
Capital expenditures     (250,704) (265,521)
Contributions in aid of construction     23,568 34,627
Other     1,100 778
Advances from affiliates     0 0
Net cash used in investing activities     (226,036) (230,116)
Cash flows from financing activities        
Common stock dividends     (70,199) (67,804)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (1,496) (1,496)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less     21,000 94,995
Other     (12) (223)
Net cash provided by financing activities     (50,707) 25,472
Net increase (decrease) in cash and cash equivalents     (1,472) (3,058)
Cash and cash equivalents, beginning of period     24,449 13,762
Cash and cash equivalents, end of period $ 22,977 $ 10,704 $ 22,977 $ 10,704