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Electric utility segment - Regulatory Proceedings (Details) |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 15, 2020 agreement | Jun. 05, 2020 USD ($) | Apr. 27, 2017 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) agreement | Dec. 31, 2018 $ / kWh | Oct. 22, 2020 | Jul. 09, 2020 entity
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Decoupling order, service reliability performance, historical measurement period (in years) |  |  |  |  | 10 years |  |  |  |
Service reliability, pending adjusted maximum penalty amount |  |  |  |  | $ 6,800,000 |  |  |  |
Dead band percentage above or below the target |  |  |  |  | 3.00% |  |  |  |
Call center performance, pending adjusted maximum penalty |  |  |  |  | $ 1,400,000 |  |  |  |
Energy price, renewable projects with storage capacity (in dollars per kilowatt hour) | $ / kWh |  |  |  |  |  |  | 0.115 |  |
Energy price, renewable energy-only projects (in dollars per kilowatt hour) | $ / kWh |  |  |  |  |  |  | 0.095 |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Threshold of capital expenditures in excess of contributions |  |  | $ 2,500,000 |  |  |  |  |  |
MPIR requested amount |  | $ 23,600,000 |  |  |  | $ 19,800,000 |  |  |
Percentage cap on cost recovery |  |  |  | 90.00% |  | 90.00% |  |  |
Maximum penalty, percent of ROE |  |  |  |  | 0.20% |  |  |  |
Call center performance, maximum penalty percentage |  |  |  |  | 0.08% |  |  |  |
Call center performance, maximum penalty amount |  |  |  | $ 300,000 |  |  |  |  |
Performance incentive mechanism, incentive cap |  |  |  |  |  | $ 3,500,000 |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement | 8 |  |  |  |  | 7 |  |  |
Incentives accrued |  |  |  | $ 1,700,000 |  | $ 1,700,000 |  |  |
Number of grid service purchase agreements | entity |  |  |  |  |  |  |  |  | 2
Number of power purchase agreements qualifying for potential payout | agreement | 1 |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
Percentage cap on cost recovery |  |  |  |  |  |  |  | 90.00% |
Percentage of allowed project costs to flow through MPIR mechanism |  |  |  |  |  |  |  | 100.00% |
Schofield Generation Station | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
MPIR requested amount |  | 19,200,000 |  |  |  |  |  |  |
West Loch PV Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
MPIR requested amount |  | 3,800,000 |  |  |  |  |  |  |
Grid Modernization Strategy Phase 1 Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |
MPIR requested amount |  | $ 600,000 |  |  |  |  |  |  |

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