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Electric utility segment - Regulatory Proceedings (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 26, 2021 USD ($) | Dec. 23, 2020 USD ($) | Apr. 27, 2017 USD ($) | Nov. 30, 2021 agreement | Dec. 31, 2021 USD ($) MWh contract project | Dec. 31, 2019 USD ($) contract | Mar. 23, 2021 mechanism | Feb. 16, 2021 contract | Dec. 31, 2020 agreement | Jul. 09, 2020 agreement
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Pilot process annual cap |  | $ 10,000,000 |  |  |  |  |  |  |  |
PUC proposal period |  | 45 days |  |  |  |  |  |  |  |
Advanced metering infrastructure utilization PIM, annual maximum reward |  |  |  |  | $ 2,000,000 |  |  |  |  |
Advanced metering infrastructure utilization PIM, duration |  |  |  |  | 3 years |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Multi-year rate period |  | 5 years |  |  |  |  |  |  |  |
Customer dividend, negative adjustment percentage |  | 0.0022% |  |  |  |  |  |  |  |
Savings commitment liability, annual rate |  | $ 6,600,000 |  |  |  |  |  |  |  |
ERP system benefits savings, liability |  | $ 3,900,000 |  |  |  |  |  |  |  |
Actual return on equity, dead band percentage, above or below target |  |  |  |  | 3.00% |  |  |  |  |
Authorized ROE |  |  |  |  | 9.50% |  |  |  |  |
Actual earnings, above or below dead band |  |  |  |  | 1.50% |  |  |  |  |
Percentage sharing between customers and utilities |  |  |  |  | 0.5 |  |  |  |  |
Percentage sharing for any further difference |  |  |  |  | 9 |  |  |  |  |
Threshold of capital expenditures in excess of customer contributions for qualification for major project interim recovery |  |  | $ 2,500,000 |  |  |  |  |  |  |
Major project interim recovery requested amount | $ 21,800,000 |  |  |  |  |  |  |  |  |
EPRM number of projects approved | contract |  |  |  |  | 2 |  |  |  |  |
EPRM project costs |  |  |  |  | $ 41,000,000 |  |  |  |  |
EPRM number of projects | project |  |  |  |  | 5 |  |  |  |  |
EPRM total project costs |  |  |  |  | $ 264,000,000 |  |  |  |  |
Target performance historical measurement period |  |  |  |  | 10 years |  |  |  |  |
Service reliability, maximum penalty, percent of return on equity |  |  |  |  | 20.00% |  |  |  |  |
Maximum penalty, pending adjusted amount |  |  |  |  | $ 6,800,000 |  |  |  |  |
Service reliability, estimated penalties |  |  |  |  | $ 200,000 |  |  |  |  |
Dead band percentage above or below target |  |  |  |  | 3.00% |  |  |  |  |
Call center performance, maximum penalty, percent |  |  |  |  | 8.00% |  |  |  |  |
Call center performance, maximum penalty, pending adjusted amount |  |  |  |  | $ 1,400,000 |  |  |  |  |
Number of contracts which qualified for incentives | contract |  |  |  |  |  | 7 |  |  |  |
Public utility, incentives accrued |  |  |  |  | $ 100,000 | $ 1,700,000 |  |  |  |
Number of grid service purchase agreements | agreement |  |  |  |  |  |  |  |  | 2 | 2
Number of additional power purchase contracts | contract |  |  |  |  |  |  |  | 1 |  |
Number of power purchase contracts approved | agreement |  |  |  | 2 |  |  |  |  |  |
Number of performance incentive mechanisms | mechanism |  |  |  |  |  |  | 2 |  |  |
Interpolated statutory RPS goal rate, years 2021 and 2022 | MWh |  |  |  |  | 20 |  |  |  |  |
Interpolated statutory RPS goal rate, year 2023 | MWh |  |  |  |  | 15 |  |  |  |  |
Interpolated statutory RPS goal rate, remainder of MRP | MWh |  |  |  |  | 10 |  |  |  |  |
RPS-A PIM estimated reward amount |  |  |  |  | $ 700,000 |  |  |  |  |
Penalty rate for failure to meet RPS targets (megawatt per hour) | MWh |  |  |  |  | 20 |  |  |  |  |
Grid services procurement PIM, maximum reward |  |  |  |  | $ 1,500,000 |  |  |  |  |
Interconnection approval PIM, annual maximum reward |  |  |  |  | 3,000,000 |  |  |  |  |
Interconnection approval PIM, annual maximum penalty |  |  |  |  | 900,000 |  |  |  |  |
Interconnection approval PIM, accrued estimated rewards |  |  |  |  | 2,800,000 |  |  |  |  |
Low-to-moderate income energy efficiency PIM, rewards cap |  |  |  |  | $ 2,000,000 |  |  |  |  |
Low-to-moderate income energy efficiency PIM, duration |  |  |  |  | 3 years |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  | $ 3,400,000 |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Schofield Generation Station |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Major project interim recovery requested amount | 17,600,000 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | West Loch PV Project |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Major project interim recovery requested amount | 3,300,000 |  |  |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Grid Modernization Strategy Phase 1 Project |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Major project interim recovery requested amount | $ 900,000 |  |  |  |  |  |  |  |  |
Hawaiian Electric |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  | 2,600,000 |  |  |  |  |
HELCO |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  | 300,000 |  |  |  |  |
Maui Electric |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  | $ 500,000 |  |  |  |  |

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