XML 59 R43.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Electric utility segment - Condensed consolidating statement of cash flows (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities |  |
Net income | $ 40,720 | $ 34,666
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation of property, plant and equipment | 53,091 | 50,051
Other amortization | 8,745 | 2,372
Deferred income taxes | (2,889) | 10,096
Allowance for equity funds used during construction | (3,294) | (2,399)
Other | 2,150 | (347)
Changes in assets and liabilities |  |
Decrease (increase) in fuel oil stock | (1,704) | (7,444)
Increase in regulatory assets | (16,900) | 5,909
Change in prepaid and accrued income taxes, tax credits and revenue taxes | (29,842) | (42,175)
Decrease in defined benefit pension and other postretirement benefit plans liability | (390) | 1,012
Net cash provided by operating activities | 34,677 | 46,991
Cash flows from investing activities |  |
Capital expenditures | (133,352) | (91,242)
Contributions in aid of construction | 4,330 | 10,650
Other | 2,593 | 5,709
Net cash used in investing activities | (231,051) | (184,481)
Cash flows from financing activities |  |
Common stock dividends | (33,741) | (33,713)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 120,485 | 2,300
Other | (4,043) | (4,857)
Net cash provided by financing activities | 179,278 | 93,268
Net decrease in cash and cash equivalents | (17,096) | (44,222)
Cash and cash equivalents, beginning of period | 261,881 | 278,452
Cash and cash equivalents, end of period | 244,785 | 234,230
Hawaiian Electric Company |  |
Cash flows from operating activities |  |
Net income | 27,745 | 21,735
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Equity in earnings of subsidiaries | (9,350) | (8,628)
Common stock dividends received from subsidiaries | 6,827 | 6,910
Depreciation of property, plant and equipment | 34,439 | 32,722
Other amortization | 3,237 | 914
Deferred income taxes | (271) | 6,810
Allowance for equity funds used during construction | (2,887) | (2,056)
Other | 2,868 | 661
Changes in assets and liabilities |  |
Increase in accounts receivable | (13,255) | (10,724)
Decrease in accrued unbilled revenues | 6,558 | (4,577)
Decrease (increase) in fuel oil stock | (1,322) | (9,234)
Decrease (increase) in materials and supplies | (1,095) | (2,267)
Increase in regulatory assets | (13,256) | 7,711
Increase (decrease) in accounts payable | (2,028) | 21,943
Change in prepaid and accrued income taxes, tax credits and revenue taxes | (25,892) | (32,272)
Decrease in defined benefit pension and other postretirement benefit plans liability | (592) | 240
Change in other assets and liabilities | 2,976 | (4,249)
Net cash provided by operating activities | 14,702 | 25,639
Cash flows from investing activities |  |
Capital expenditures | (84,226) | (64,035)
Contributions in aid of construction | 3,327 | 8,934
Other | 269 | 2,352
Advances (to) from affiliates | (3,000) | 0
Net cash used in investing activities | (83,630) | (52,749)
Cash flows from financing activities |  |
Common stock dividends | (25,826) | (21,942)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (270) | (270)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 104,984 | (3,000)
Other | (31) | (449)
Net cash provided by financing activities | 78,857 | (25,661)
Net decrease in cash and cash equivalents | 9,929 | (52,771)
Cash and cash equivalents, beginning of period | 2,059 | 61,388
Cash and cash equivalents, end of period | 11,988 | 8,617
HELCO |  |
Cash flows from operating activities |  |
Net income | 6,235 | 4,718
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 | 10,055 | 9,685
Other amortization | 1,554 | 442
Deferred income taxes | (1,806) | 1,700
Allowance for equity funds used during construction | (111) | (115)
Other | (103) | (138)
Changes in assets and liabilities |  |
Increase in accounts receivable | (2,048) | 1,239
Decrease in accrued unbilled revenues | 758 | (319)
Decrease (increase) in fuel oil stock | (803) | 1,485
Decrease (increase) in materials and supplies | (550) | (1,114)
Increase in regulatory assets | (1,773) | (677)
Increase (decrease) in accounts payable | 4,050 | (1,721)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | (1,882) | (5,352)
Decrease in defined benefit pension and other postretirement benefit plans liability | (198) | 14
Change in other assets and liabilities | 2,875 | 805
Net cash provided by operating activities | 16,253 | 10,652
Cash flows from investing activities |  |
Capital expenditures | (15,161) | (12,434)
Contributions in aid of construction | 656 | 915
Other | 264 | 78
Advances (to) from affiliates | 0 | (3,000)
Net cash used in investing activities | (14,241) | (14,441)
Cash flows from financing activities |  |
Common stock dividends | (3,821) | (3,874)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (134) | (134)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 3,000 | 0
Other | (2) | 0
Net cash provided by financing activities | (957) | (4,008)
Net decrease in cash and cash equivalents | 1,055 | (7,797)
Cash and cash equivalents, beginning of period | 4,025 | 10,749
Cash and cash equivalents, end of period | 5,080 | 2,952
Maui Electric |  |
Cash flows from operating activities |  |
Net income | 3,319 | 4,114
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 | 5,972 | 5,809
Other amortization | 553 | 593
Deferred income taxes | 497 | 2,602
Allowance for equity funds used during construction | (296) | (228)
Other | (84) | (87)
Changes in assets and liabilities |  |
Increase in accounts receivable | (1,396) | 685
Decrease in accrued unbilled revenues | 103 | (1,043)
Decrease (increase) in fuel oil stock | 275 | 305
Decrease (increase) in materials and supplies | 350 | 15
Increase in regulatory assets | (1,871) | (1,125)
Increase (decrease) in accounts payable | 3,121 | (2,991)
Change in prepaid and accrued income taxes, tax credits and revenue taxes | (5,532) | (6,408)
Decrease in defined benefit pension and other postretirement benefit plans liability | (148) | 10
Change in other assets and liabilities | 349 | 197
Net cash provided by operating activities | 5,212 | 2,448
Cash flows from investing activities |  |
Capital expenditures | (15,070) | (8,243)
Contributions in aid of construction | 347 | 801
Other | 510 | 272
Advances (to) from affiliates | 12,000 | 7,500
Net cash used in investing activities | (2,213) | 330
Cash flows from financing activities |  |
Common stock dividends | (3,006) | (2,986)
Preferred stock dividends of Hawaiian Electric and subsidiaries | (95) | (95)
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 0 | 0
Other | 0 | (208)
Net cash provided by financing activities | (3,101) | (3,289)
Net decrease in cash and cash equivalents | (102) | (511)
Cash and cash equivalents, beginning of period | 6,332 | 2,048
Cash and cash equivalents, end of period | 6,230 | 1,537
Other subsidiaries |  |
Cash flows from operating activities |  |
Net income | 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
Other | 0 | 0
Changes in assets and liabilities |  |
Increase in accounts receivable | 0 | 0
Decrease in accrued unbilled revenues | 0 | 0
Decrease (increase) in fuel oil stock | 0 | 0
Decrease (increase) in materials and supplies | 0 | 0
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
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
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
Consolidating adjustments |  |
Cash flows from operating activities |  |
Net income | (9,325) | (8,603)
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Equity in earnings of subsidiaries | 9,325 | 8,603
Common stock dividends received from subsidiaries | (6,827) | (6,860)
Depreciation of property, plant and equipment | 0 | 0
Other amortization | 0 | 0
Deferred income taxes | 0 | (48)
Allowance for equity funds used during construction | 0 | 0
Other | 0 | 0
Changes in assets and liabilities |  |
Increase in accounts receivable | 1,662 | 1,472
Decrease in accrued unbilled revenues | 0 | 0
Decrease (increase) in fuel oil stock | 0 | 0
Decrease (increase) in materials and supplies | 0 | 0
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 | 440 | 48
Decrease in defined benefit pension and other postretirement benefit plans liability | 0 | 0
Change in other assets and liabilities | (1,662) | (1,472)
Net cash provided by operating activities | (6,387) | (6,860)
Cash flows from investing activities |  |
Capital expenditures | 0 | 0
Contributions in aid of construction | 0 | 0
Other | (440) | 0
Advances (to) from affiliates | (9,000) | (4,500)
Net cash used in investing activities | (9,440) | (4,500)
Cash flows from financing activities |  |
Common stock dividends | 6,827 | 6,860
Preferred stock dividends of Hawaiian Electric and subsidiaries | 0 | 0
Net increase in short-term borrowings from non-affiliates and affiliate with original maturities of three months or less | 9,000 | 4,500
Other | 0 | 0
Net cash provided by financing activities | 15,827 | 11,360
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
Hawaiian Electric Company, Inc. and Subsidiaries |  |
Cash flows from operating activities |  |
Net income | 27,974 | 21,964
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Equity in earnings of subsidiaries | (25) | (25)
Common stock dividends received from subsidiaries | 0 | 50
Depreciation of property, plant and equipment | 50,466 | 48,216
Other amortization | 5,344 | 1,949
Deferred income taxes | (1,580) | 11,064
Allowance for equity funds used during construction | (3,294) | (2,399)
Other | 2,681 | 436
Changes in assets and liabilities |  |
Increase in accounts receivable | (15,037) | (7,328)
Decrease in accrued unbilled revenues | 7,419 | (5,939)
Decrease (increase) in fuel oil stock | (1,850) | (7,444)
Decrease (increase) in materials and supplies | (1,295) | (3,366)
Increase in regulatory assets | (16,900) | 5,909
Increase (decrease) in accounts payable | 5,143 | 17,231
Change in prepaid and accrued income taxes, tax credits and revenue taxes | (32,866) | (43,984)
Decrease in defined benefit pension and other postretirement benefit plans liability | (938) | 264
Change in other assets and liabilities | 4,538 | (4,719)
Net cash provided by operating activities | 29,780 | 31,879
Cash flows from investing activities |  |
Capital expenditures | (114,457) | (84,712)
Contributions in aid of construction | 4,330 | 10,650
Other | 603 | 2,702
Advances (to) from affiliates | 0 | 0
Net cash used in investing activities | (109,524) | (71,360)
Cash flows from financing activities |  |
Common stock dividends | (25,826) | (21,942)
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 | 116,984 | 1,500
Other | (33) | (657)
Net cash provided by financing activities | 90,626 | (21,598)
Net decrease in cash and cash equivalents | 10,882 | (61,079)
Cash and cash equivalents, beginning of period | 12,517 | 74,286
Cash and cash equivalents, end of period | $ 23,399 | $ 13,207

X
- Definition This element represents Equity in earnings. + References No definition available. + Details
Name: | he_EquityInEarnings
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (Decrease) In Other Operating Assets And Liabilities, Net Excluding Dividends Received From Subsidiaries And Equity In Earnings Of Subsidiaries + References No definition available. + Details
Name: | he_IncreaseDecreaseInOtherOperatingAssetsAndLiabilitiesNetExcludingDividendsReceivedFromSubsidiariesAndEquityInEarningsOfSubsidiaries
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the amount due to fund defined benefit pension and other postretirement benefit plans liability. + References No definition available. + Details
Name: | he_IncreaseDecreaseInPensionAndOtherPostretirementDefinedBenefitPlansLiability
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net changes in cash flows resulting from changes in prepaid and accrued income taxes and utility revenue taxes. + References No definition available. + Details
Name: | he_IncreaseDecreaseInPrepaidAndAccruedIncomeTaxesAndUtilityRevenueTaxes
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_AdjustmentForAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
Name: | us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=63044130 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
Name: | us-gaap_DeferredIncomeTaxExpenseBenefit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccountsPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the value of fuel held in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInFuelInventories
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncreaseDecreaseInOperatingCapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the value of other assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInOtherRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period in the value of raw materials, packaging materials and supplies held in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInRawMaterialsPackagingMaterialsAndSuppliesInventories
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInUnbilledReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities). + References No definition available. + Details
Name: | us-gaap_OtherOperatingActivitiesCashFlowStatement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
Name: | us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash (inflow) outflow from investing activities classified as other. + 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 9 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 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 + Details
Name: | us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_PaymentsOfDividendsCommonStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
Name: | us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties. + 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 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromContributionInAidOfConstruction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_ProceedsFromDividendsReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow (outflow) from financing activities classified as other. + 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 8 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 + Details
Name: | us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=65897068&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 + Details
Name: | us-gaap_ProfitLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501569&loc=d3e55921-110430 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
Name: | us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiiElectricLightCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_MauiElectricCompanyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_RenewableHawaiiAndUluwehiokamaBiofuelsCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_ConsolidationReclassificationsAndEliminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=he_HawaiianElectricCompanyAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |