XML 61 R35.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Electric utility segment - Annual decoupling filings summary (Details) | Mar. 31, 2017 USD ($) kWh
--- | ---
Hawaiian Electric Company |
Regulatory projects and legal obligations |
2017 Annual incremental RAM adjusted revenues | $ 12,700,000
Annual change in accrued earnings sharing credits | 0
Annual change in accrued RBA balance as of December 31, 2016 (and associated revenue taxes) (refunded) | (2,400,000)
Net annual incremental amount to be collected under the tariffs | 10,300,000
Impact on typical residential customer monthly bill (in dollars) | $ 0.60
Monthly utility usage assumption (in kilowatt hours) | kWh | 500
HELCO |
Regulatory projects and legal obligations |
2017 Annual incremental RAM adjusted revenues | $ 3,200,000
Annual change in accrued earnings sharing credits | 0
Annual change in accrued RBA balance as of December 31, 2016 (and associated revenue taxes) (refunded) | (2,500,000)
Net annual incremental amount to be collected under the tariffs | 700,000
Impact on typical residential customer monthly bill (in dollars) | $ 0.15
Monthly utility usage assumption (in kilowatt hours) | kWh | 500
Maui Electric |
Regulatory projects and legal obligations |
2017 Annual incremental RAM adjusted revenues | $ 1,600,000
Annual change in accrued earnings sharing credits | 0
Annual change in accrued RBA balance as of December 31, 2016 (and associated revenue taxes) (refunded) | (200,000)
Net annual incremental amount to be collected under the tariffs | 1,400,000
Impact on typical residential customer monthly bill (in dollars) | $ 0.79
Monthly utility usage assumption (in kilowatt hours) | kWh | 500
Lanai and Molokai |
Regulatory projects and legal obligations |
Impact on typical residential customer monthly bill (in dollars) | $ 0.63
Monthly utility usage assumption (in kilowatt hours) | kWh | 400

X
- Definition Public Utilities, Increase (Decrease) In Customer Monthly Bill + References No definition available. + Details
Name: | he_PublicUtilitiesIncreaseDecreaseInCustomerMonthlyBill
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Monthly Utility Usage Assumption + References No definition available. + Details
Name: | he_PublicUtilitiesMonthlyUtilityUsageAssumption
Namespace Prefix: | he_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utility, Annual Incremental Rate Adjustment Mechanism Adjusted Revenue + References No definition available. + Details
Name: | he_PublicUtilityAnnualIncrementalRateAdjustmentMechanismAdjustedRevenue
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utility, Increase (Decrease) In Accrued Earnings Sharing Credits To Be Refunded + References No definition available. + Details
Name: | he_PublicUtilityIncreaseDecreaseInAccruedEarningsSharingCreditsToBeRefunded
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utility, Increase (Decrease) In Accrued Revenue Balancing Account To Be Collected + References No definition available. + Details
Name: | he_PublicUtilityIncreaseDecreaseInAccruedRevenueBalancingAccountToBeCollected
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utility, Net Receivable Under Tariff + References No definition available. + Details
Name: | he_PublicUtilityNetReceivableUnderTariff
Namespace Prefix: | he_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | he_RegulatoryProjectsAndLegalObligationsLineItems
Namespace Prefix: | he_
Data Type: | xbrli:stringItemType
Balance Type: | na
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_LanaiandMolokaiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |