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Electric utility segment - Consolidating statement of cash flows (unaudited) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities    
Net income $ 32,825 $ 32,339
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation of property, plant and equipment 48,594 45,865
Other amortization 1,928 2,371
Increase in deferred income taxes 13,008 3,828
Allowance for equity funds used during construction (1,739) (1,413)
Changes in assets and liabilities    
Decrease in fuel oil stock 22,812 20,731
Decrease (increase) in regulatory assets 1,585 (10,827)
Change in prepaid and accrued income and utility revenue taxes (14,343) (9,461)
Increase in defined benefit pension and other postretirement benefit plans liability 137 123
Net cash provided by operating activities 170,592 138,610
Cash flows from investing activities    
Capital expenditures (127,818) (123,527)
Contributions in aid of construction 13,761 9,145
Other 819 3,549
Net cash used in investing activities (215,251) (152,045)
Cash flows from financing activities    
Common stock dividends (27,716) (31,829)
Net decrease in short-term borrowings with original maturities of three months or less (7,578) (88,472)
Other (3,896) (3,965)
Net cash provided by financing activities 78,924 130,061
Net increase in cash and cash equivalents 34,265 116,626
Hawaiian Electric Company    
Cash flows from operating activities    
Net income 25,637 27,144
Adjustments to reconcile net income to net cash provided by operating activities    
Equity in earnings of subsidiaries (7,954) (7,717)
Common stock dividends received from subsidiaries 6,592 6,324
Depreciation of property, plant and equipment 31,522 29,389
Other amortization 1,045 590
Increase in deferred income taxes 9,764 12,048
Change in tax credits, net 1,386 2,246
Allowance for equity funds used during construction (1,406) (1,123)
Changes in assets and liabilities    
Decrease in accounts receivable 22,606 21,703
Decrease (increase) in accrued unbilled revenues 58 21,726
Decrease in fuel oil stock 14,902 8,654
Decrease (increase) in materials and supplies 378 (1,115)
Decrease (increase) in regulatory assets 79 (8,903)
Increase in accounts payable 24,827 16,520
Change in prepaid and accrued income and utility revenue taxes (31,916) (52,273)
Increase in defined benefit pension and other postretirement benefit plans liability 177 0
Change in other assets and liabilities 15,249 (8,614)
Net cash provided by operating activities 112,946 66,599
Cash flows from investing activities    
Capital expenditures (97,363) (92,242)
Contributions in aid of construction 11,585 8,121
Other 22 175
Advances from affiliates 0 3,500
Net cash used in investing activities (85,756) (80,446)
Cash flows from financing activities    
Common stock dividends (23,400) (22,601)
Preferred stock dividends of Hawaiian Electric and subsidiaries (270) (270)
Net decrease in short-term borrowings with original maturities of three months or less 9,498 30,000
Other 8 (214)
Net cash provided by financing activities (14,164) 6,915
Net increase in cash and cash equivalents 13,026 (6,932)
Cash and cash equivalents, beginning of period 16,281 12,416
Cash and cash equivalents, end of period 29,307 5,484
HELCO    
Cash flows from operating activities    
Net income 4,096 3,922
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation of property, plant and equipment 9,449 9,313
Other amortization 268 500
Increase in deferred income taxes 1,277 719
Change in tax credits, net 154 200
Allowance for equity funds used during construction (127) (145)
Changes in assets and liabilities    
Decrease in accounts receivable 2,113 2,147
Decrease (increase) in accrued unbilled revenues (326) 1,426
Decrease in fuel oil stock 2,622 5,817
Decrease (increase) in materials and supplies (27) 75
Decrease (increase) in regulatory assets 397 (1,522)
Increase in accounts payable 1,652 (2,548)
Change in prepaid and accrued income and utility revenue taxes (1,634) (1,807)
Increase in defined benefit pension and other postretirement benefit plans liability 13 0
Change in other assets and liabilities 5,562 203
Net cash provided by operating activities 25,489 18,300
Cash flows from investing activities    
Capital expenditures (16,649) (14,902)
Contributions in aid of construction 969 758
Other 23 26
Advances from affiliates 3,000 0
Net cash used in investing activities (12,657) (14,118)
Cash flows from financing activities    
Common stock dividends (3,302) (2,505)
Preferred stock dividends of Hawaiian Electric and subsidiaries (134) (134)
Net decrease in short-term borrowings with original maturities of three months or less 0 (500)
Other (8) (1)
Net cash provided by financing activities (3,444) (3,140)
Net increase in cash and cash equivalents 9,388 1,042
Cash and cash equivalents, beginning of period 2,682 612
Cash and cash equivalents, end of period 12,070 1,654
Maui Electric    
Cash flows from operating activities    
Net income 4,062 3,999
Adjustments to reconcile net income to net cash provided by operating activities    
Depreciation of property, plant and equipment 5,810 5,541
Other amortization 461 608
Increase in deferred income taxes 2,517 2,365
Change in tax credits, net 162 130
Allowance for equity funds used during construction (206) (145)
Changes in assets and liabilities    
Decrease in accounts receivable 3,563 4,408
Decrease (increase) in accrued unbilled revenues (590) 4,728
Decrease in fuel oil stock 5,288 6,260
Decrease (increase) in materials and supplies (178) (317)
Decrease (increase) in regulatory assets 1,109 (402)
Increase in accounts payable 1,287 1,408
Change in prepaid and accrued income and utility revenue taxes (8,466) (9,616)
Increase in defined benefit pension and other postretirement benefit plans liability 15 110
Change in other assets and liabilities 169 (517)
Net cash provided by operating activities 15,003 18,560
Cash flows from investing activities    
Capital expenditures (11,171) (11,730)
Contributions in aid of construction 1,207 266
Other 0 42
Advances from affiliates 500 0
Net cash used in investing activities (9,464) (11,422)
Cash flows from financing activities    
Common stock dividends (3,265) (3,794)
Preferred stock dividends of Hawaiian Electric and subsidiaries (95) (95)
Net decrease in short-term borrowings with original maturities of three months or less 0 (3,000)
Other 0 (1)
Net cash provided by financing activities (3,360) (6,890)
Net increase in cash and cash equivalents 2,179 248
Cash and cash equivalents, beginning of period 5,385 633
Cash and cash equivalents, end of period 7,564 881
Other subsidiaries    
Cash flows from operating activities    
Net income 0 0
Changes in assets and liabilities    
Net cash provided by operating activities 0 0
Cash flows from investing activities    
Capital expenditures 0 0
Contributions in aid of construction 0 0
Advances from affiliates 0 0
Net cash used in investing activities 0 0
Cash flows from financing activities    
Net increase 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
Consolidating adjustments    
Cash flows from operating activities    
Net income (7,929) (7,692)
Adjustments to reconcile net income to net cash provided by operating activities    
Equity in earnings of subsidiaries 7,929 7,692
Common stock dividends received from subsidiaries (6,567) (6,299)
Increase in deferred income taxes 0  
Changes in assets and liabilities    
Decrease in accounts receivable 15 846
Change in prepaid and accrued income and utility revenue taxes (2)  
Change in other assets and liabilities (13) (846)
Net cash provided by operating activities (6,567) (6,299)
Cash flows from investing activities    
Capital expenditures 0 0
Contributions in aid of construction 0 0
Advances from affiliates (3,500) (3,500)
Net cash used in investing activities (3,500) (3,500)
Cash flows from financing activities    
Common stock dividends 6,567 6,299
Net decrease in short-term borrowings with original maturities of three months or less 3,500 3,500
Net cash provided by financing activities 10,067 9,799
Net increase 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
Hawaiian Electric Company, Inc. and Subsidiaries    
Cash flows from operating activities    
Net income 25,866 27,373
Adjustments to reconcile net income to net cash provided by operating activities    
Equity in earnings of subsidiaries (25) (25)
Common stock dividends received from subsidiaries 25 25
Depreciation of property, plant and equipment 46,781 44,243
Other amortization 1,774 1,698
Increase in deferred income taxes 13,558 15,132
Change in tax credits, net 1,702 2,576
Allowance for equity funds used during construction (1,739) (1,413)
Changes in assets and liabilities    
Decrease in accounts receivable 28,297 29,104
Decrease (increase) in accrued unbilled revenues (858) 27,880
Decrease in fuel oil stock 22,812 20,731
Decrease (increase) in materials and supplies 173 (1,357)
Decrease (increase) in regulatory assets 1,585 (10,827)
Increase in accounts payable 27,766 15,380
Change in prepaid and accrued income and utility revenue taxes (42,018) (63,696)
Increase in defined benefit pension and other postretirement benefit plans liability 205 110
Change in other assets and liabilities 20,967 (9,774)
Net cash provided by operating activities 146,871 97,160
Cash flows from investing activities    
Capital expenditures (125,183) (118,874)
Contributions in aid of construction 13,761 9,145
Other 45 243
Advances from affiliates 0 0
Net cash used in investing activities (111,377) (109,486)
Cash flows from financing activities    
Common stock dividends (23,400) (22,601)
Preferred stock dividends of Hawaiian Electric and subsidiaries (499) (499)
Net decrease in short-term borrowings with original maturities of three months or less 12,998 30,000
Other 0 (216)
Net cash provided by financing activities (10,901) 6,684
Net increase in cash and cash equivalents 24,593 (5,642)
Cash and cash equivalents, beginning of period 24,449 13,762
Cash and cash equivalents, end of period $ 49,042 $ 8,120