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Consolidated Statements of Cash Flows - HECO - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities      
Net income $ 250,146 $ 161,767 $ 170,019
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation of property, plant and equipment 194,273 183,966 172,762
Other amortization 10,473 11,619 10,282
Impairment of utility assets 0 6,021 1,866
Deferred income taxes 47,118 41,432 104,225
Allowance for equity funds used during construction (8,325) (6,928) (6,771)
Other (12,422) 1,672 (280)
Changes in assets and liabilities      
Decrease in fuel oil stock 4,786 34,830 28,041
Increase in regulatory assets (18,273) (24,182) (17,000)
Change in prepaid and accrued income taxes, tax credits and revenue taxes 39,109 (42,596) (39,091)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 1,587 852 22,251
Change in other assets and liabilities (23,118) (41,070) (101,195)
Net cash provided by operating activities 495,254 355,880 325,420
Cash flows from investing activities      
Capital expenditures (330,043) (363,804) (364,826)
Contributions in aid of construction 30,100 40,239 41,806
Other 856 7,940 1,125
Net cash used in investing activities (736,465) (705,724) (592,449)
Cash flows from financing activities      
Common stock dividends (117,274) (131,765) (126,458)
Net proceeds from issuance of common stock 13,220 104,435 26,898
Proceeds from issuance of long-term debt 115,000 80,000 125,000
Repayment of long-term debt (75,000) 0 (111,400)
Other (219) (833) (456)
Net cash used in financing activities 219,185 474,780 222,535
Net increase (decrease) in cash and equivalents (22,026) 124,936 (44,494)
Hawaiian Electric Company, Inc. and Subsidiaries      
Cash flows from operating activities      
Net income 144,312 137,709 139,636
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation of property, plant and equipment 187,061 177,380 166,387
Other amortization 6,935 8,939 9,897
Impairment of utility assets 0 6,021 1,866
Deferred income taxes 74,386 75,626 82,947
Income tax credits, net 231 4,844 6,062
Allowance for equity funds used during construction (8,325) (6,928) (6,771)
Change in cash overdraft 0 0 (1,038)
Other (3,931) 1,672 758
Changes in assets and liabilities      
Decrease in accounts receivable 8,551 23,727 26,743
Decrease (increase) in accrued unbilled revenues (7,184) 40,093 6,750
Decrease in fuel oil stock 4,786 34,830 28,041
Decrease (increase) in materials and supplies 750 2,821 (72)
Increase in regulatory assets (18,273) (24,182) (17,000)
Decrease in accounts payable (10,614) (54,555) (65,527)
Change in prepaid and accrued income taxes, tax credits and revenue taxes 2,123 (63,096) (4,036)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability 484 1,125 (961)
Change in other assets and liabilities (11,375) (32,620) (66,687)
Net cash provided by operating activities 369,917 333,406 306,995
Cash flows from investing activities      
Capital expenditures (320,437) (350,161) (336,679)
Contributions in aid of construction 30,100 40,239 41,806
Other 2,138 1,140 1,164
Net cash used in investing activities (288,199) (308,782) (293,709)
Cash flows from financing activities      
Common stock dividends (93,599) (90,405) (88,492)
Preferred stock dividends of Hawaiian Electric and subsidiaries (1,995) (1,995) (1,995)
Net proceeds from issuance of common stock 24,000 0 40,000
Proceeds from issuance of long-term debt 40,000 80,000 0
Repayment of long-term debt 0 0 (11,400)
Other (287) (1,537) (462)
Net cash used in financing activities (31,881) (13,937) (62,349)
Net increase (decrease) in cash and equivalents 49,837 10,687 (49,063)
Cash and cash equivalents, beginning of period 24,449 13,762 62,825
Cash and cash equivalents, end of period $ 74,286 $ 24,449 $ 13,762