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Electric utility segment - Regulatory proceedings (Details) $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) project contract | Nov. 12, 2021 | Feb. 16, 2021 agreement | Dec. 23, 2020 USD ($) | Mar. 31, 2022 USD ($) MWh project contract | Nov. 30, 2021 agreement | Dec. 31, 2021 USD ($) | Dec. 31, 2019 USD ($) agreement | Feb. 28, 2022 USD ($) | Jun. 01, 2021 mechanism | Mar. 23, 2021 mechanism | Jul. 09, 2020 entity
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Propose pilots annual cap |  |  |  | $ 10.0 |  |  |  |  |  |  |  |
Potential total annual maximum reward | $ 2.0 |  |  |  | $ 2.0 |  |  |  |  |  |  |
Advanced metering infrastructure term |  |  |  |  | 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 |  |  |  | 0.22% |  |  |  |  |  |  |  |
Savings commitment liability, annual rate |  |  |  | $ 6.6 |  |  |  |  |  |  |  |
Earnings sharing mechanism, actual return on equity, dead band percentage above or below target |  |  |  |  | 3.00% |  |  |  |  |  |  |
Approved return on equity, percentage |  |  |  |  | 9.50% |  |  |  |  |  |  |
Earnings sharing mechanism, actual earning, above or below dead band |  |  |  |  | 1.50% |  |  |  |  |  |  |
MPIR requested amount | $ 25.9 |  |  |  |  |  |  |  |  |  |  |
EPRM approved projects | contract | 2 |  |  |  | 2 |  |  |  |  |  |  |
EPRM approved projects, capital costs |  |  |  |  | $ 41.0 |  |  |  |  |  |  |
Number of projects | project | 5 |  |  |  | 5 |  |  |  |  |  |  |
Estimated capital costs |  |  |  |  | $ 264.0 |  |  |  |  |  |  |
Development period |  | 3 years |  |  |  |  |  |  |  |  |  |
2021 deferred costs to be reviewed by the PUC |  |  |  |  |  |  |  |  | $ 0.1 |  |  |
Decoupling order, service reliability performance, historical measurement period (in years) |  |  |  |  | 10 years |  |  |  |  |  |  |
Maximum penalty, percent of ROE |  |  |  |  | 0.20% |  |  |  |  |  |  |
Service reliability, pending adjusted maximum penalty amount |  |  |  |  | $ 6.8 |  |  |  |  |  |  |
Service reliability, estimated penalties |  |  |  |  | $ 0.2 |  |  |  |  |  |  |
Dead band percentage above or below the target |  |  |  |  | 3.00% |  |  |  |  |  |  |
Call center performance, maximum penalty percentage |  |  |  |  | 0.08% |  |  |  |  |  |  |
Call center performance, pending adjusted maximum penalty |  |  |  |  | $ 1.4 |  |  |  |  |  |  |
Number of power purchase agreements (PPAs) (in agreements) | agreement |  |  | 1 |  |  |  |  | 7 |  |  |  |
Incentives accrued |  |  |  |  |  |  | $ 0.1 | $ 1.7 |  |  |  |
Number of grid service purchase agreements | entity |  |  |  |  |  |  |  |  |  |  |  | 2
Number of PPAs approved | agreement |  |  |  |  |  | 2 |  |  |  |  |  |
Number of performance incentive mechanisms | mechanism |  |  |  |  |  |  |  |  |  | 3 | 2 |
Interpolated RPS rate goal, year one and two (dollars per MWh) | MWh |  |  |  |  | 20 |  |  |  |  |  |  |
Interpolated RPS rate goal, year three (dollars per MWh) | MWh |  |  |  |  | 15 |  |  |  |  |  |  |
Interpolated RPS rate goal, after year three (dollars per MWh) | MWh |  |  |  |  | 10 |  |  |  |  |  |  |
Failure to meet RPS targets, penalty rate (dollars per MWh) | MWh |  |  |  |  | 20 |  |  |  |  |  |  |
Estimated rewards |  |  |  |  |  |  | 1.0 |  |  |  |  |
Potential total annual maximum reward | $ 1.5 |  |  |  | $ 1.5 |  |  |  |  |  |  |
Potential total annual maximum reward | 3.0 |  |  |  | 3.0 |  |  |  |  |  |  |
Total annual maximum penalty | 0.9 |  |  |  | 0.9 |  |  |  |  |  |  |
Interconnection approval PIM, accrued estimated rewards |  |  |  |  | 2.8 |  |  |  |  |  |  |
Performance incentive mechanism, maximum reward | 2.0 |  |  |  | $ 2.0 |  |  |  |  |  |  |
Performance incentive mechanism, term |  |  |  |  | 3 years |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  |  |  | 3.7 |  |  |  |  |
Hawaiian Electric, Parent |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  |  |  | 2.8 |  |  |  |  |
HELCO |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  |  |  | 0.4 |  |  |  |  |
Maui Electric |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrued estimated rewards, net of penalties |  |  |  |  |  |  | $ 0.5 |  |  |  |  |
Schofield Generation Station | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
MPIR requested amount | 16.5 |  |  |  |  |  |  |  |  |  |  |
West Loch PV Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
MPIR requested amount | 3.3 |  |  |  |  |  |  |  |  |  |  |
Grid Modernization Strategy Phase 1 Project | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Projects and Legal Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
MPIR requested amount | $ 6.1 |  |  |  |  |  |  |  |  |  |  |

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