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Consolidated Statements of Cash Flows (unaudited) - HECO - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities    
Net income $ 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 (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 taxes and revenue taxes 52,558 (8,458)
Increase in defined benefit pension and other postretirement benefit plans liability 150 418
Change in other assets and liabilities (39,850) (41,954)
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, Inc. and Subsidiaries    
Cash flows from operating activities    
Net income 109,694 104,217
Adjustments to reconcile net income to net cash provided by operating activities    
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 (6,010) (5,366)
Impairment of utility assets 0 4,828
Other (2,022) (326)
Changes in assets and liabilities    
Increase in accounts receivable (655) (4,464)
Decrease (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 taxes and 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
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