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Consolidated Statements of Cash Flows (unaudited) - HECO - 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 taxes and revenue taxes (14,343) (9,461)
Increase in defined benefit pension and other postretirement benefit plans liability 137 123
Change in other assets and liabilities 4,499 (25,992)
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 increase in short-term borrowings from non-affiliates and affiliate 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, 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    
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 taxes and 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
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 increase in short-term borrowings from non-affiliates and affiliate 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