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Consolidated Statements of Cash Flows - HECO - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 167,187 $ 250,146 $ 161,767
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation of property, plant and equipment 200,658 194,273 183,966
Other amortization 21,340 10,473 11,619
Impairment of utility assets 0 0 6,021
Deferred income taxes 37,835 47,118 41,432
Allowance for equity funds used during construction (12,483) (8,325) (6,928)
Other (3,324) (12,422) 1,672
Changes in assets and liabilities      
Decrease (increase) in fuel oil stock (20,794) 4,786 34,830
Increase in regulatory assets (17,256) (18,273) (24,182)
Change in prepaid and accrued income taxes, tax credits and revenue taxes 20,685 39,109 (42,596)
Increase in defined benefit pension and other postretirement benefit plans liability 882 1,587 852
Change in other assets and liabilities (25,551) (23,118) (41,070)
Net cash provided by operating activities 420,441 495,658 356,858
Cash flows from investing activities      
Capital expenditures (495,187) (330,043) (363,804)
Contributions in aid of construction 64,733 30,100 40,239
Other 6,468 856 7,940
Net cash used in investing activities (815,299) (736,465) (705,724)
Cash flows from financing activities      
Common stock dividends (134,873) (117,274) (131,765)
Proceeds from issuance of common stock 0 13,220 104,435
Proceeds from issuance of long-term debt 532,325 115,000 80,000
Funds transferred for redemption of special purpose revenue bonds (465,000) (75,000) 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less 67,992 (103,063) (15,909)
Other (6,349) 2,197 2,427
Net cash used in financing activities 378,287 218,781 473,802
Net increase (decrease) in cash and equivalents (16,571) (22,026) 124,936
Hawaiian Electric Company, Inc. and Subsidiaries      
Cash flows from operating activities      
Net income 121,946 144,312 137,709
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation of property, plant and equipment 192,784 187,061 177,380
Other amortization 8,498 6,935 8,939
Impairment of utility assets 0 0 6,021
Deferred income taxes 38,037 74,386 75,626
Allowance for equity funds used during construction (12,483) (8,325) (6,928)
Other (1,066) (3,700) 6,516
Changes in assets and liabilities      
Decrease in accounts receivable 2,914 8,551 23,727
Decrease (increase) in accrued unbilled revenues (15,361) (7,184) 40,093
Decrease (increase) in fuel oil stock (20,443) 4,786 34,830
Decrease (increase) in materials and supplies (718) 750 2,821
Increase in regulatory assets (17,256) (18,273) (24,182)
Increase (decrease) in accounts payable 25,734 (10,614) (54,555)
Change in prepaid and accrued income taxes, tax credits and revenue taxes 29,862 2,123 (63,096)
Increase in defined benefit pension and other postretirement benefit plans liability 604 484 1,125
Change in other assets and liabilities (17,866) (11,375) (32,620)
Net cash provided by operating activities 335,186 369,917 333,406
Cash flows from investing activities      
Capital expenditures (441,598) (320,437) (350,161)
Contributions in aid of construction 64,733 30,100 40,239
Other 4,578 2,138 1,140
Net cash used in investing activities (372,287) (288,199) (308,782)
Cash flows from financing activities      
Common stock dividends (87,767) (93,599) (90,405)
Preferred stock dividends of Hawaiian Electric and subsidiaries (1,995) (1,995) (1,995)
Proceeds from issuance of common stock 14,000 24,000 0
Proceeds from issuance of long-term debt 315,000 40,000 80,000
Funds transferred for redemption of special purpose revenue bonds (265,000) 0 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less 4,999 0 0
Other (3,905) (287) (1,537)
Net cash used in financing activities (24,668) (31,881) (13,937)
Net increase (decrease) in cash and equivalents (61,769) 49,837 10,687
Cash and cash equivalents, beginning of period 74,286 24,449 13,762
Cash and cash equivalents, end of period $ 12,517 $ 74,286 $ 24,449