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Electric utility segment - Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 32,843 | $ 60,544 | $ 39,134 | $ 34,666 | $ 45,107 | $ 127,613 | $ 44,601 | $ 32,825 | $ 167,187 | $ 250,146 | $ 161,767
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 200,658 | 194,273 | 183,966
Other amortization |  |  |  |  |  |  |  |  | 21,340 | 10,473 | 11,619
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 0 | 6,021
Deferred income taxes |  |  |  |  |  |  |  |  | 37,835 | 47,118 | 41,432
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | (12,483) | (8,325) | (6,928)
Other |  |  |  |  |  |  |  |  | (3,324) | (12,422) | 1,672
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Increase in fuel oil stock |  |  |  |  |  |  |  |  | (20,794) | 4,786 | 34,830
Increase in regulatory assets |  |  |  |  |  |  |  |  | (17,256) | (18,273) | (24,182)
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | 20,685 | 39,109 | (42,596)
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | 882 | 1,587 | 852
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 420,441 | 495,658 | 356,858
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (495,187) | (330,043) | (363,804)
Contributions in aid of construction |  |  |  |  |  |  |  |  | 64,733 | 30,100 | 40,239
Other |  |  |  |  |  |  |  |  | 6,468 | 856 | 7,940
Net cash used in investing activities |  |  |  |  |  |  |  |  | (815,299) | (736,465) | (705,724)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | (134,873) | (117,274) | (131,765)
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 0 | 13,220 | 104,435
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 532,325 | 115,000 | 80,000
Funds transferred for redemption of special purpose revenue bonds |  |  |  |  |  |  |  |  | (465,000) | (75,000) | 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  |  |  |  |  |  |  | 67,992 | (103,063) | (15,909)
Other |  |  |  |  |  |  |  |  | (6,349) | 2,197 | 2,427
Net cash used in financing activities |  |  |  |  |  |  |  |  | 378,287 | 218,781 | 473,802
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | (16,571) | (22,026) | 124,936
Hawaiian Electric Company, Inc (HECO) |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 121,031 | 143,397 | 136,794
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings |  |  |  |  |  |  |  |  | (38,157) | (42,491) | (43,020)
Common stock dividends received from subsidiaries |  |  |  |  |  |  |  |  | 36,867 | 47,843 | 25,296
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 130,889 | 126,086 | 117,682
Other amortization |  |  |  |  |  |  |  |  | 2,398 | 2,979 | 4,678
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 4,573
Deferred income taxes |  |  |  |  |  |  |  |  | 26,342 | 54,721 | 53,338
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | (10,896) | (6,659) | (5,641)
Other |  |  |  |  |  |  |  |  | (1,154) | (2,517) | 8,687
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts receivable |  |  |  |  |  |  |  |  | 1,817 | 10,175 | 15,652
Decrease (increase) in accrued unbilled revenues |  |  |  |  |  |  |  |  | (11,355) | (5,741) | 29,733
Increase in fuel oil stock |  |  |  |  |  |  |  |  | (17,733) | 2,216 | 25,060
Decrease (increase) in materials and supplies |  |  |  |  |  |  |  |  | 1,603 | 993 | 2,233
Increase in regulatory assets |  |  |  |  |  |  |  |  | (8,395) | (16,161) | (20,356)
Increase (decrease) in accounts payable |  |  |  |  |  |  |  |  | 23,519 | (10,247) | (42,751)
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | 16,716 | 2,933 | (50,382)
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | 709 | 599 | 870
Changes in other assets and liabilities |  |  |  |  |  |  |  |  | (16,213) | (11,682) | (24,197)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 257,988 | 296,444 | 238,249
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (339,279) | (236,425) | (267,621)
Contributions in aid of construction |  |  |  |  |  |  |  |  | 57,527 | 23,611 | 35,955
Advances from (to) affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 16,100
Other |  |  |  |  |  |  |  |  | (1,711) | 1,932 | 924
Net cash used in investing activities |  |  |  |  |  |  |  |  | (283,463) | (210,882) | (214,642)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | (87,767) | (93,599) | (90,405)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  |  |  |  |  |  |  | (1,080) | (1,080) | (1,080)
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 14,000 | 24,000 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 202,000 | 40,000 | 50,000
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 |  |  |  |  |  |  |  |  | 3,499 | (9,500) | 23,000
Other |  |  |  |  |  |  |  |  | (2,506) | (276) | (1,257)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (33,854) | (40,455) | (19,742)
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | (59,329) | 45,107 | 3,865
Cash and cash equivalents, beginning of period |  |  |  | 61,388 |  |  |  | 16,281 | 61,388 | 16,281 | 12,416
Cash and cash equivalents, end of period | 2,059 |  |  |  | 61,388 |  |  |  | 2,059 | 61,388 | 16,281
Hawaii Electric Light Company, Inc. (HELCO) |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 20,680 | 21,789 | 21,289
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Common stock dividends received from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 38,741 | 37,797 | 37,250
Other amortization |  |  |  |  |  |  |  |  | 3,225 | 1,817 | 2,124
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 724
Deferred income taxes |  |  |  |  |  |  |  |  | 3,954 | 7,027 | 8,295
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | (554) | (765) | (604)
Other |  |  |  |  |  |  |  |  | 430 | (750) | (1,949)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts receivable |  |  |  |  |  |  |  |  | (359) | (718) | 3,420
Decrease (increase) in accrued unbilled revenues |  |  |  |  |  |  |  |  | (2,376) | (1,033) | 4,593
Increase in fuel oil stock |  |  |  |  |  |  |  |  | (469) | 81 | 5,490
Decrease (increase) in materials and supplies |  |  |  |  |  |  |  |  | (661) | (515) | (201)
Increase in regulatory assets |  |  |  |  |  |  |  |  | (4,007) | (1,243) | (3,930)
Increase (decrease) in accounts payable |  |  |  |  |  |  |  |  | (3,547) | 768 | (6,425)
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | 7,961 | 2,645 | (6,166)
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | 52 | 53 | (161)
Changes in other assets and liabilities |  |  |  |  |  |  |  |  | (433) | (78) | (3,545)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 62,637 | 66,875 | 60,204
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (52,077) | (51,344) | (48,645)
Contributions in aid of construction |  |  |  |  |  |  |  |  | 4,293 | 3,412 | 2,160
Advances from (to) affiliates |  |  |  |  |  |  |  |  | 3,500 | 12,000 | (15,500)
Other |  |  |  |  |  |  |  |  | 649 | 175 | 132
Net cash used in investing activities |  |  |  |  |  |  |  |  | (43,635) | (35,757) | (61,853)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | (24,796) | (22,507) | (10,021)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  |  |  |  |  |  |  | (534) | (534) | (534)
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 0 | 0 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 28,000 | 0 | 25,000
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 | (10,500)
Other |  |  |  |  |  |  |  |  | (396) | (10) | (226)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (25,726) | (23,051) | 3,719
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | (6,724) | 8,067 | 2,070
Cash and cash equivalents, beginning of period |  |  |  | 10,749 |  |  |  | 2,682 | 10,749 | 2,682 | 612
Cash and cash equivalents, end of period | 4,025 |  |  |  | 10,749 |  |  |  | 4,025 | 10,749 | 2,682
Maui Electric Company, Limited (MECO) |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 18,292 | 21,517 | 22,546
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Common stock dividends received from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 23,154 | 23,178 | 22,448
Other amortization |  |  |  |  |  |  |  |  | 2,875 | 2,139 | 2,137
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 724
Deferred income taxes |  |  |  |  |  |  |  |  | 8,004 | 12,661 | 13,707
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | (1,033) | (901) | (683)
Other |  |  |  |  |  |  |  |  | (342) | (433) | (222)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts receivable |  |  |  |  |  |  |  |  | 45 | 1,776 | 4,617
Decrease (increase) in accrued unbilled revenues |  |  |  |  |  |  |  |  | (1,630) | (410) | 5,767
Increase in fuel oil stock |  |  |  |  |  |  |  |  | (2,241) | 2,489 | 4,280
Decrease (increase) in materials and supplies |  |  |  |  |  |  |  |  | (1,660) | 272 | 789
Increase in regulatory assets |  |  |  |  |  |  |  |  | (4,854) | (869) | 104
Increase (decrease) in accounts payable |  |  |  |  |  |  |  |  | 5,762 | (1,135) | (5,379)
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | 5,362 | (3,478) | (6,548)
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | (157) | (168) | 416
Changes in other assets and liabilities |  |  |  |  |  |  |  |  | 166 | (2,272) | (4,554)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 51,743 | 54,366 | 60,149
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (50,242) | (32,668) | (33,895)
Contributions in aid of construction |  |  |  |  |  |  |  |  | 2,913 | 3,077 | 2,124
Advances from (to) affiliates |  |  |  |  |  |  |  |  | (2,000) | (2,500) | (7,500)
Other |  |  |  |  |  |  |  |  | 400 | 31 | 84
Net cash used in investing activities |  |  |  |  |  |  |  |  | (48,929) | (32,060) | (39,187)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | (11,946) | (25,261) | (15,175)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  |  |  |  |  |  |  | (381) | (381) | (381)
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 4,800 | 0 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 85,000 | 0 | 5,000
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 |  |  |  |  |  |  |  |  | 0 | 0 | (5,600)
Other |  |  |  |  |  |  |  |  | (1,003) | (1) | (54)
Net cash used in financing activities |  |  |  |  |  |  |  |  | 1,470 | (25,643) | (16,210)
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | 4,284 | (3,337) | 4,752
Cash and cash equivalents, beginning of period |  |  |  | 2,048 |  |  |  | 5,385 | 2,048 | 5,385 | 633
Cash and cash equivalents, end of period | 6,332 |  |  |  | 2,048 |  |  |  | 6,332 | 2,048 | 5,385
Other subsidiaries |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings |  |  |  |  |  |  |  |  | 0 | 0 | 0
Common stock dividends received from subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 0
Deferred income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts receivable |  |  |  |  |  |  |  |  | 0 | 0 | 0
Decrease (increase) in accrued unbilled revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase in fuel oil stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Decrease (increase) in materials and supplies |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase in regulatory assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase (decrease) in accounts payable |  |  |  |  |  |  |  |  | 0 | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | 0 | 0 | 0
Changes in other assets and liabilities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Contributions in aid of construction |  |  |  |  |  |  |  |  | 0 | 0 | 0
Advances from (to) affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 0 | 0 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 0
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 | 0
Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net cash used in financing activities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash and cash equivalents, beginning of period |  |  |  | 101 |  |  |  | 101 | 101 | 101 | 101
Cash and cash equivalents, end of period | 101 |  |  |  | 101 |  |  |  | 101 | 101 | 101
Consolidating adjustments |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (38,057) | (42,391) | (42,920)
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings |  |  |  |  |  |  |  |  | 38,057 | 42,391 | 42,920
Common stock dividends received from subsidiaries |  |  |  |  |  |  |  |  | (36,742) | (47,768) | (25,196)
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment of assets |  |  |  |  |  |  |  |  |  |  | 0
Deferred income taxes |  |  |  |  |  |  |  |  | (263) | (23) | 286
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts receivable |  |  |  |  |  |  |  |  | 1,411 | (2,682) | 38
Decrease (increase) in accrued unbilled revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase in fuel oil stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Decrease (increase) in materials and supplies |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase in regulatory assets |  |  |  |  |  |  |  |  | 0 | 0 | 0
Increase (decrease) in accounts payable |  |  |  |  |  |  |  |  | 0 | 0 | 0
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | (177) | 23 | 0
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | 0 | 0 | 0
Changes in other assets and liabilities |  |  |  |  |  |  |  |  | (1,411) | 2,682 | (324)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | (37,182) | (47,768) | (25,196)
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 0 | 0
Contributions in aid of construction |  |  |  |  |  |  |  |  | 0 | 0 | 0
Advances from (to) affiliates |  |  |  |  |  |  |  |  | (1,500) | (9,500) | 6,900
Other |  |  |  |  |  |  |  |  | 5,240 | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | 3,740 | (9,500) | 6,900
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | 36,742 | 47,768 | 25,196
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | (4,800) | 0 |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 0 | 0 | 0
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 |  |  |  |  |  |  |  |  | 1,500 | 9,500 | (6,900)
Other |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net cash used in financing activities |  |  |  |  |  |  |  |  | 33,442 | 57,268 | 18,296
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash and cash equivalents, beginning of period |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0
Cash and cash equivalents, end of period | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
HECO Consolidated |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 25,854 | $ 47,985 | $ 26,143 | 21,964 | 34,618 | $ 47,472 | $ 36,356 | 25,866 | 121,946 | 144,312 | 137,709
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in earnings |  |  |  |  |  |  |  |  | (100) | (100) | (100)
Common stock dividends received from subsidiaries |  |  |  |  |  |  |  |  | 125 | 75 | 100
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 192,784 | 187,061 | 177,380
Other amortization |  |  |  |  |  |  |  |  | 8,498 | 6,935 | 8,939
Impairment of assets |  |  |  |  |  |  |  |  | 0 | 0 | 6,021
Deferred income taxes |  |  |  |  |  |  |  |  | 38,037 | 74,386 | 75,626
Allowance for equity funds used during construction |  |  |  |  |  |  |  |  | (12,483) | (8,325) | (6,928)
Other |  |  |  |  |  |  |  |  | (1,066) | (3,700) | 6,516
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts receivable |  |  |  |  |  |  |  |  | 2,914 | 8,551 | 23,727
Decrease (increase) in accrued unbilled revenues |  |  |  |  |  |  |  |  | (15,361) | (7,184) | 40,093
Increase in fuel oil stock |  |  |  |  |  |  |  |  | (20,443) | 4,786 | 34,830
Decrease (increase) in materials and supplies |  |  |  |  |  |  |  |  | (718) | 750 | 2,821
Increase in regulatory assets |  |  |  |  |  |  |  |  | (17,256) | (18,273) | (24,182)
Increase (decrease) in accounts payable |  |  |  |  |  |  |  |  | 25,734 | (10,614) | (54,555)
Change in prepaid and accrued income taxes, tax credits and revenue taxes |  |  |  |  |  |  |  |  | 29,862 | 2,123 | (63,096)
Increase in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | 604 | 484 | 1,125
Changes in other assets and liabilities |  |  |  |  |  |  |  |  | (17,891) | (11,350) | (32,620)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 335,186 | 369,917 | 333,406
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (441,598) | (320,437) | (350,161)
Contributions in aid of construction |  |  |  |  |  |  |  |  | 64,733 | 30,100 | 40,239
Advances from (to) affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  | 4,578 | 2,138 | 1,140
Net cash used in investing activities |  |  |  |  |  |  |  |  | (372,287) | (288,199) | (308,782)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Common stock dividends |  |  |  |  |  |  |  |  | (87,767) | (93,599) | (90,405)
Preferred stock dividends of Hawaiian Electric and subsidiaries |  |  |  |  |  |  |  |  | (1,995) | (1,995) | (1,995)
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 14,000 | 24,000 | 0
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 315,000 | 40,000 | 80,000
Funds transferred for redemption of special purpose revenue bonds |  |  |  |  |  |  |  |  | (265,000) | 0 | 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less |  |  |  |  |  |  |  |  | 4,999 | 0 | 0
Other |  |  |  |  |  |  |  |  | (3,905) | (287) | (1,537)
Net cash used in financing activities |  |  |  |  |  |  |  |  | (24,668) | (31,881) | (13,937)
Net increase (decrease) in cash and equivalents |  |  |  |  |  |  |  |  | (61,769) | 49,837 | 10,687
Cash and cash equivalents, beginning of period |  |  |  | $ 74,286 |  |  |  | $ 24,449 | 74,286 | 24,449 | 13,762
Cash and cash equivalents, end of period | $ 12,517 |  |  |  | $ 74,286 |  |  |  | $ 12,517 | $ 74,286 | $ 24,449

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition Dividends received on equity and other investments during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 + Details
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