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Electric utility segment - Condensed consolidating statement of cash flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Cash flows from operating activities |  |  |  |
Net income | $ 46,527 | $ 39,134 | $ 87,247 | $ 73,800
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation of property, plant and equipment |  |  | 106,063 | 100,062
Other amortization |  |  | 20,603 | 6,101
Deferred income taxes |  |  | (9,672) | 17,047
Allowance for equity funds used during construction | (2,983) | (3,027) | (6,277) | (5,426)
Other |  |  | (147) | 246
Changes in assets and liabilities |  |  |  |
Increase in fuel oil stock |  |  | (19,867) | (5,962)
Increase in regulatory assets |  |  | (19,600) | 8,179
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (26,558) | (37,954)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (871) | 420
Net cash provided by operating activities |  |  | 108,271 | 174,102
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (259,898) | (210,325)
Contributions in aid of construction |  |  | 13,573 | 17,571
Other |  |  | 5,919 | 8,216
Net cash used in investing activities |  |  | (391,420) | (387,521)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (67,481) | (67,426)
Proceeds from issuance of long-term debt |  |  | 100,000 | 265,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  | (878) | (265,000)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 84,881 | 49,789
Other |  |  | (230) | (3,253)
Net cash provided by financing activities |  |  | 275,933 | 145,348
Net decrease in cash and cash equivalents |  |  | (7,216) | (68,071)
Cash and cash equivalents, beginning of period |  |  | 261,881 | 278,452
Cash and cash equivalents, end of period | 254,665 | 210,381 | 254,665 | 210,381
Consolidating adjustments |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | (9,080) | (7,936) | (18,405) | (16,539)
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | 18,405 | 16,539
Common stock dividends received from subsidiaries |  |  | (13,654) | (13,721)
Depreciation of property, plant and equipment |  |  | 0 | 0
Other amortization |  |  | 0 | 0
Deferred income taxes |  |  | 0 | (39)
Allowance for equity funds used during construction | 0 | 0 | 0 | 0
Other |  |  | 0 | 0
Changes in assets and liabilities |  |  |  |
Increase in accounts receivable |  |  | (245) | 3,256
Decrease (increase) in accrued unbilled revenues |  |  | 0 | 0
Increase in fuel oil stock |  |  | 0 | 0
Increase in materials and supplies |  |  | 0 | 0
Increase in regulatory assets |  |  | 0 | 0
Increase in accounts payable |  |  | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (601) | (465)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | 0 | 0
Change in other assets and liabilities |  |  | 245 | (3,256)
Net cash provided by operating activities |  |  | (14,255) | (14,225)
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | 0 | 0
Contributions in aid of construction |  |  | 0 | 0
Other |  |  | 601 | 504
Advances (to) from affiliates |  |  | (5,400) | (8,400)
Net cash used in investing activities |  |  | (4,799) | (7,896)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | 13,654 | 13,721
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | 0 | 0
Proceeds from issuance of long-term debt |  |  | 0 |
Proceeds from issuance of special purpose revenue bonds |  |  |  | 0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  |  | 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 5,400 | 8,400
Other |  |  | 0 | 0
Net cash provided by financing activities |  |  | 19,054 | 22,121
Net decrease 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 | 0 | 0
Hawaiian Electric (parent only) | Reportable Legal Entities |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 31,439 | 25,914 | 59,184 | 47,649
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | (18,455) | (16,589)
Common stock dividends received from subsidiaries |  |  | 13,679 | 13,771
Depreciation of property, plant and equipment |  |  | 68,830 | 65,445
Other amortization |  |  | 9,200 | 1,875
Deferred income taxes |  |  | (6,708) | 15,060
Allowance for equity funds used during construction | (2,588) | (2,659) | (5,475) | (4,715)
Other |  |  | 1,469 | 1,089
Changes in assets and liabilities |  |  |  |
Increase in accounts receivable |  |  | (25,673) | (5,100)
Decrease (increase) in accrued unbilled revenues |  |  | (3,063) | (8,819)
Increase in fuel oil stock |  |  | (9,513) | (4,250)
Increase in materials and supplies |  |  | (2,752) | (788)
Increase in regulatory assets |  |  | (14,728) | 11,378
Increase in accounts payable |  |  | 13,093 | 33,121
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (15,343) | (29,430)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (1,117) | 355
Change in other assets and liabilities |  |  | 1,116 | (12,727)
Net cash provided by operating activities |  |  | 63,744 | 107,325
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (156,600) | (146,721)
Contributions in aid of construction |  |  | 9,680 | 14,078
Other |  |  | 2,241 | 4,820
Advances (to) from affiliates |  |  | (5,600) | 0
Net cash used in investing activities |  |  | (150,279) | (127,823)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (51,652) | (43,884)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (540) | (540)
Proceeds from issuance of long-term debt |  |  | 75,000 |
Proceeds from issuance of special purpose revenue bonds |  |  |  | 162,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  |  | (162,000)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 75,881 | 35,590
Other |  |  | (291) | (2,068)
Net cash provided by financing activities |  |  | 98,398 | (10,902)
Net decrease in cash and cash equivalents |  |  | 11,863 | (31,400)
Cash and cash equivalents, beginning of period |  |  | 2,059 | 61,388
Cash and cash equivalents, end of period | 13,922 | 29,988 | 13,922 | 29,988
HELCO | Reportable Legal Entities |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 3,896 | 3,765 | 10,131 | 8,483
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | 0 | 0
Common stock dividends received from subsidiaries |  |  | 0 | 0
Depreciation of property, plant and equipment |  |  | 20,093 | 19,371
Other amortization |  |  | 2,976 | 905
Deferred income taxes |  |  | (2,429) | 3,590
Allowance for equity funds used during construction | (124) | (134) | (235) | (249)
Other |  |  | (322) | 699
Changes in assets and liabilities |  |  |  |
Increase in accounts receivable |  |  | (2,387) | 1,182
Decrease (increase) in accrued unbilled revenues |  |  | 697 | (602)
Increase in fuel oil stock |  |  | (3,934) | 94
Increase in materials and supplies |  |  | (559) | (1,472)
Increase in regulatory assets |  |  | (1,974) | (1,575)
Increase in accounts payable |  |  | 3,096 | 970
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (9,952) | (6,290)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (380) | 26
Change in other assets and liabilities |  |  | 3,173 | 129
Net cash provided by operating activities |  |  | 17,994 | 25,261
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (26,667) | (22,423)
Contributions in aid of construction |  |  | 2,243 | 1,870
Other |  |  | 884 | 619
Advances (to) from affiliates |  |  | (1,000) | (600)
Net cash used in investing activities |  |  | (24,540) | (20,534)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (7,644) | (7,748)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (267) | (267)
Proceeds from issuance of long-term debt |  |  | 15,000 |
Proceeds from issuance of special purpose revenue bonds |  |  |  | 28,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  |  | (28,000)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 0 | 0
Other |  |  | (52) | (357)
Net cash provided by financing activities |  |  | 7,037 | (8,372)
Net decrease in cash and cash equivalents |  |  | 491 | (3,645)
Cash and cash equivalents, beginning of period |  |  | 4,025 | 10,749
Cash and cash equivalents, end of period | 4,516 | 7,104 | 4,516 | 7,104
Maui Electric | Reportable Legal Entities |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 5,413 | 4,400 | 8,732 | 8,514
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | 0 | 0
Common stock dividends received from subsidiaries |  |  | 0 | 0
Depreciation of property, plant and equipment |  |  | 11,904 | 11,556
Other amortization |  |  | 845 | 1,482
Deferred income taxes |  |  | 794 | 4,988
Allowance for equity funds used during construction | (271) | (234) | (567) | (462)
Other |  |  | (169) | (173)
Changes in assets and liabilities |  |  |  |
Increase in accounts receivable |  |  | (5,763) | (1,067)
Decrease (increase) in accrued unbilled revenues |  |  | (1,419) | (2,482)
Increase in fuel oil stock |  |  | (6,696) | (1,806)
Increase in materials and supplies |  |  | (233) | (1,160)
Increase in regulatory assets |  |  | (2,898) | (1,624)
Increase in accounts payable |  |  | 2,095 | 5,625
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (5,165) | (4,725)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (464) | (79)
Change in other assets and liabilities |  |  | 1,357 | 1,807
Net cash provided by operating activities |  |  | 2,353 | 20,394
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (29,953) | (21,015)
Contributions in aid of construction |  |  | 1,650 | 1,623
Other |  |  | 575 | 307
Advances (to) from affiliates |  |  | 12,000 | 9,000
Net cash used in investing activities |  |  | (15,728) | (10,085)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (6,010) | (5,973)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (191) | (191)
Proceeds from issuance of long-term debt |  |  | 10,000 |
Proceeds from issuance of special purpose revenue bonds |  |  |  | 75,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  |  | (75,000)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 5,600 | 0
Other |  |  | (35) | (804)
Net cash provided by financing activities |  |  | 9,364 | (6,968)
Net decrease in cash and cash equivalents |  |  | (4,011) | 3,341
Cash and cash equivalents, beginning of period |  |  | 6,332 | 2,048
Cash and cash equivalents, end of period | 2,321 | 5,389 | 2,321 | 5,389
Other subsidiaries | Reportable Legal Entities |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 0 | 0 | 0 | 0
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | 0 | 0
Common stock dividends received from subsidiaries |  |  | 0 | 0
Depreciation of property, plant and equipment |  |  | 0 | 0
Other amortization |  |  | 0 | 0
Deferred income taxes |  |  | 0 | 0
Allowance for equity funds used during construction | 0 | 0 | 0 | 0
Other |  |  | 0 | 0
Changes in assets and liabilities |  |  |  |
Increase in accounts receivable |  |  | 0 | 0
Decrease (increase) in accrued unbilled revenues |  |  | 0 | 0
Increase in fuel oil stock |  |  | 0 | 0
Increase in materials and supplies |  |  | 0 | 0
Increase in regulatory assets |  |  | 0 | 0
Increase in accounts payable |  |  | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | 0 | 0
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | 0 | 0
Change in other assets and liabilities |  |  | 0 | 0
Net cash provided by operating activities |  |  | 0 | 0
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | 0 | 0
Contributions in aid of construction |  |  | 0 | 0
Other |  |  | 0 | 0
Advances (to) from affiliates |  |  | 0 | 0
Net cash used in investing activities |  |  | 0 | 0
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | 0 | 0
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | 0 | 0
Proceeds from issuance of long-term debt |  |  | 0 |
Proceeds from issuance of special purpose revenue bonds |  |  |  | 0
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  |  | 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 0 | 0
Other |  |  | 0 | 0
Net cash provided by financing activities |  |  | 0 | 0
Net decrease 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 | 101 | 101
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 31,668 | 26,143 | 59,642 | 48,107
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | (50) | (50)
Common stock dividends received from subsidiaries |  |  | 25 | 50
Depreciation of property, plant and equipment |  |  | 100,827 | 96,372
Other amortization |  |  | 13,021 | 4,262
Deferred income taxes |  |  | (8,343) | 23,599
Allowance for equity funds used during construction | (2,983) | (3,027) | (6,277) | (5,426)
Other |  |  | 978 | 1,615
Changes in assets and liabilities |  |  |  |
Increase in accounts receivable |  |  | (34,068) | (1,729)
Decrease (increase) in accrued unbilled revenues |  |  | (3,785) | (11,903)
Increase in fuel oil stock |  |  | (20,143) | (5,962)
Increase in materials and supplies |  |  | (3,544) | (3,420)
Increase in regulatory assets |  |  | (19,600) | 8,179
Increase in accounts payable |  |  | 18,284 | 39,716
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (31,061) | (40,910)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (1,961) | 302
Change in other assets and liabilities |  |  | 5,891 | (14,047)
Net cash provided by operating activities |  |  | 69,836 | 138,755
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (213,220) | (190,159)
Contributions in aid of construction |  |  | 13,573 | 17,571
Other |  |  | 4,301 | 6,250
Advances (to) from affiliates |  |  | 0 | 0
Net cash used in investing activities |  |  | (195,346) | (166,338)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (51,652) | (43,884)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (998) | (998)
Proceeds from issuance of long-term debt |  |  | 100,000 | 265,000
Proceeds from issuance of special purpose revenue bonds |  |  |  | 265,000
Repayment of long-term debt and funds transferred for redemption of special purpose revenue bonds |  |  | 0 | (265,000)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 86,881 | 43,990
Other |  |  | (378) | (3,229)
Net cash provided by financing activities |  |  | 133,853 | (4,121)
Net decrease in cash and cash equivalents |  |  | 8,343 | (31,704)
Cash and cash equivalents, beginning of period |  |  | 12,517 | 74,286
Cash and cash equivalents, end of period | $ 20,860 | $ 42,582 | $ 20,860 | $ 42,582

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