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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Cash flows from operating activities |  |  |  |
Net income | $ 42,985 | $ 46,527 | $ 89,146 | $ 87,247
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation of property, plant and equipment |  |  | 114,863 | 106,063
Other amortization |  |  | 22,439 | 20,603
Deferred income taxes |  |  | (6,662) | (9,672)
Allowance for equity funds used during construction | (3,175) | (2,983) | (6,085) | (6,277)
Other |  |  | (7,320) | (147)
Changes in assets and liabilities |  |  |  |
Decrease (increase) in fuel oil stock |  |  | (40,557) | (19,867)
Decrease (increase) in regulatory assets |  |  | 25,392 | (19,600)
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (45,977) | (26,558)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (1,774) | (871)
Net cash provided by operating activities |  |  | 133,406 | 108,271
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (229,282) | (246,325)
Other |  |  | 6,143 | 13,657
Net cash used in investing activities |  |  | (275,130) | (391,420)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (69,720) | (67,481)
Proceeds from issuance of long-term debt |  |  | 56,150 | 100,000
Repayment of long-term debt |  |  | (52,489) | (878)
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 112,901 | 84,881
Net increase in other bank borrowings with original maturities of three months or less |  |  | 1,445 | 38,446
Other |  |  | 1,189 | (230)
Net cash provided by financing activities |  |  | 171,065 | 275,933
Net increase (decrease) in cash and cash equivalents |  |  | 29,341 | (7,216)
Cash and cash equivalents, beginning of period |  |  | 169,208 | 261,881
Cash and cash equivalents, end of period | 198,549 | 254,665 | 198,549 | 254,665
Consolidating adjustments |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | (8,086) | (9,080) | (19,935) | (18,405)
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | 19,935 | 18,405
Common stock dividends received from subsidiaries |  |  | (12,624) | (13,654)
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 |  |  |  |
Decrease (increase) in accounts receivable |  |  | (2,341) | (245)
Decrease (increase) in accrued unbilled revenues |  |  | 0 | 0
Decrease (increase) in fuel oil stock |  |  | 0 | 0
Decrease (increase) in materials and supplies |  |  | 0 | 0
Decrease (increase) in regulatory assets |  |  | 0 | 0
Increase (decrease) in accounts payable |  |  | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | 0 | (601)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | 0 | 0
Change in other assets and liabilities |  |  | 2,341 | 245
Net cash provided by operating activities |  |  | (12,624) | (14,255)
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | 0 | 0
Advances to affiliates |  |  | 30,300 | (5,400)
Other |  |  | 0 | 601
Net cash used in investing activities |  |  | 30,300 | (4,799)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | 12,624 | 13,654
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | 0 | 0
Proceeds from issuance of long-term debt |  |  | 0 | 0
Repayment of long-term debt |  |  | 0 |
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 0 | 5,400
Net increase in other bank borrowings with original maturities of three months or less |  |  | (30,300) |
Other |  |  | 0 | 0
Net cash provided by financing activities |  |  | (17,676) | 19,054
Net increase (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 | 32,844 | 31,439 | 65,240 | 59,184
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | (19,972) | (18,455)
Common stock dividends received from subsidiaries |  |  | 12,661 | 13,679
Depreciation of property, plant and equipment |  |  | 71,735 | 68,830
Other amortization |  |  | 11,444 | 9,200
Deferred income taxes |  |  | (5,354) | (6,708)
Allowance for equity funds used during construction | (2,614) | (2,588) | (5,061) | (5,475)
Other |  |  | (2,494) | 1,469
Changes in assets and liabilities |  |  |  |
Decrease (increase) in accounts receivable |  |  | 19,969 | (25,673)
Decrease (increase) in accrued unbilled revenues |  |  | 1,769 | (3,063)
Decrease (increase) in fuel oil stock |  |  | (46,641) | (9,513)
Decrease (increase) in materials and supplies |  |  | (3,583) | (2,752)
Decrease (increase) in regulatory assets |  |  | 24,318 | (14,728)
Increase (decrease) in accounts payable |  |  | 5,804 | 13,093
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (34,328) | (15,343)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (1,205) | (1,117)
Change in other assets and liabilities |  |  | (9,875) | 1,116
Net cash provided by operating activities |  |  | 84,427 | 63,744
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (150,945) | (146,920)
Advances to affiliates |  |  | (25,300) | (5,600)
Other |  |  | 2,821 | 2,241
Net cash used in investing activities |  |  | (173,424) | (150,279)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (50,626) | (51,652)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (540) | (540)
Proceeds from issuance of long-term debt |  |  | 30,000 | 75,000
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 25,000 | 75,881
Net increase in other bank borrowings with original maturities of three months or less |  |  | 116,901 |
Other |  |  | 197 | (291)
Net cash provided by financing activities |  |  | 89,386 | 98,398
Net increase (decrease) in cash and cash equivalents |  |  | 389 | 11,863
Cash and cash equivalents, beginning of period |  |  | 16,732 | 2,059
Cash and cash equivalents, end of period | 17,121 | 13,922 | 17,121 | 13,922
HELCO |  |  |  |
Cash flows from financing activities |  |  |  |
Repayment of long-term debt |  |  | (10,000) |
HELCO | Reportable Legal Entities |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 4,799 | 3,896 | 10,102 | 10,131
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 |  |  | 20,906 | 20,093
Other amortization |  |  | 2,142 | 2,976
Deferred income taxes |  |  | (1,554) | (2,429)
Allowance for equity funds used during construction | (218) | (124) | (350) | (235)
Other |  |  | (292) | (322)
Changes in assets and liabilities |  |  |  |
Decrease (increase) in accounts receivable |  |  | (6,446) | (2,387)
Decrease (increase) in accrued unbilled revenues |  |  | 1,622 | 697
Decrease (increase) in fuel oil stock |  |  | (349) | (3,934)
Decrease (increase) in materials and supplies |  |  | (2,456) | (559)
Decrease (increase) in regulatory assets |  |  | 2,288 | (1,974)
Increase (decrease) in accounts payable |  |  | (3,454) | 3,096
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (5,111) | (9,952)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (377) | (380)
Change in other assets and liabilities |  |  | (265) | 3,173
Net cash provided by operating activities |  |  | 16,406 | 17,994
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (18,083) | (24,424)
Advances to affiliates |  |  | (5,000) | (1,000)
Other |  |  | (280) | 884
Net cash used in investing activities |  |  | (23,363) | (24,540)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (5,090) | (7,644)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (267) | (267)
Proceeds from issuance of long-term debt |  |  | 10,000 | 15,000
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 0 | 0
Net increase in other bank borrowings with original maturities of three months or less |  |  | 0 |
Other |  |  | 43 | (52)
Net cash provided by financing activities |  |  | (5,314) | 7,037
Net increase (decrease) in cash and cash equivalents |  |  | (12,271) | 491
Cash and cash equivalents, beginning of period |  |  | 15,623 | 4,025
Cash and cash equivalents, end of period | 3,352 | 4,516 | 3,352 | 4,516
Maui Electric |  |  |  |
Cash flows from financing activities |  |  |  |
Repayment of long-term debt |  |  | (10,000) |
Maui Electric | Reportable Legal Entities |  |  |  |
Cash flows from operating activities |  |  |  |
Net income | 3,516 | 5,413 | 10,291 | 8,732
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 |  |  | 15,219 | 11,904
Other amortization |  |  | 75 | 845
Deferred income taxes |  |  | 297 | 794
Allowance for equity funds used during construction | (343) | (271) | (674) | (567)
Other |  |  | (767) | (169)
Changes in assets and liabilities |  |  |  |
Decrease (increase) in accounts receivable |  |  | (1,188) | (5,763)
Decrease (increase) in accrued unbilled revenues |  |  | (801) | (1,419)
Decrease (increase) in fuel oil stock |  |  | 5,284 | (6,696)
Decrease (increase) in materials and supplies |  |  | 149 | (233)
Decrease (increase) in regulatory assets |  |  | (1,214) | (2,898)
Increase (decrease) in accounts payable |  |  | (2,395) | 2,095
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (6,346) | (5,165)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (317) | (464)
Change in other assets and liabilities |  |  | (5,006) | 1,357
Net cash provided by operating activities |  |  | 12,607 | 2,353
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (30,868) | (28,303)
Advances to affiliates |  |  | 0 | 12,000
Other |  |  | (31) | 575
Net cash used in investing activities |  |  | (30,899) | (15,728)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (7,534) | (6,010)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (191) | (191)
Proceeds from issuance of long-term debt |  |  | 10,000 | 10,000
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 0 | 5,600
Net increase in other bank borrowings with original maturities of three months or less |  |  | 25,300 |
Other |  |  | 83 | (35)
Net cash provided by financing activities |  |  | 17,658 | 9,364
Net increase (decrease) in cash and cash equivalents |  |  | (634) | (4,011)
Cash and cash equivalents, beginning of period |  |  | 3,421 | 6,332
Cash and cash equivalents, end of period | 2,787 | 2,321 | 2,787 | 2,321
Other subsidiaries |  |  |  |
Cash flows from financing activities |  |  |  |
Repayment of long-term debt |  |  | 0 |
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 |  |  |  |
Decrease (increase) in accounts receivable |  |  | 0 | 0
Decrease (increase) in accrued unbilled revenues |  |  | 0 | 0
Decrease (increase) in fuel oil stock |  |  | 0 | 0
Decrease (increase) in materials and supplies |  |  | 0 | 0
Decrease (increase) in regulatory assets |  |  | 0 | 0
Increase (decrease) 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
Advances to affiliates |  |  | 0 | 0
Other |  |  | 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 | 0
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 0 | 0
Net increase in other bank borrowings with original maturities of three months or less |  |  | 0 |
Other |  |  | 0 | 0
Net cash provided by financing activities |  |  | 0 | 0
Net increase (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 | 33,073 | 31,668 | 65,698 | 59,642
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Equity in earnings of subsidiaries |  |  | (37) | (50)
Common stock dividends received from subsidiaries |  |  | 37 | 25
Depreciation of property, plant and equipment |  |  | 107,860 | 100,827
Other amortization |  |  | 13,661 | 13,021
Deferred income taxes |  |  | (6,611) | (8,343)
Allowance for equity funds used during construction | (3,175) | (2,983) | (6,085) | (6,277)
Other |  |  | (3,553) | 978
Changes in assets and liabilities |  |  |  |
Decrease (increase) in accounts receivable |  |  | 9,994 | (34,068)
Decrease (increase) in accrued unbilled revenues |  |  | 2,590 | (3,785)
Decrease (increase) in fuel oil stock |  |  | (41,706) | (20,143)
Decrease (increase) in materials and supplies |  |  | (5,890) | (3,544)
Decrease (increase) in regulatory assets |  |  | 25,392 | (19,600)
Increase (decrease) in accounts payable |  |  | (45) | 18,284
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  | (45,785) | (31,061)
Decrease in defined benefit pension and other postretirement benefit plans liability |  |  | (1,899) | (1,961)
Change in other assets and liabilities |  |  | (12,805) | 5,891
Net cash provided by operating activities |  |  | 100,816 | 69,836
Cash flows from investing activities |  |  |  |
Capital expenditures |  |  | (199,896) | (199,647)
Advances to affiliates |  |  | 0 | 0
Other |  |  | 2,510 | 4,301
Net cash used in investing activities |  |  | (197,386) | (195,346)
Cash flows from financing activities |  |  |  |
Common stock dividends |  |  | (50,626) | (51,652)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  | (998) | (998)
Proceeds from issuance of long-term debt |  |  | 50,000 | 100,000
Repayment of long-term debt |  |  | (51,546) | 0
Increase (decrease) in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  | 25,000 | 86,881
Net increase in other bank borrowings with original maturities of three months or less |  |  | 111,901 | 86,881
Other |  |  | 323 | (378)
Net cash provided by financing activities |  |  | 84,054 | 133,853
Net increase (decrease) in cash and cash equivalents |  |  | (12,516) | 8,343
Cash and cash equivalents, beginning of period |  |  | 35,877 | 12,517
Cash and cash equivalents, end of period | $ 23,361 | $ 20,860 | 23,361 | $ 20,860
Hawaiian Electric Company |  |  |  |
Cash flows from financing activities |  |  |  |
Repayment of long-term debt |  |  | $ (31,546) |

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