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Electric utility segment - Annual Decoupling Filings (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
Regulatory Projects and Legal Obligations [Line Items] |
2022 ARA revenues | $ 29.5
Management Audit savings commitment | (6.6)
Net 2022 ARA revenues | 22.9
Incremental RAM revenues and ARA revenues | 61.5
Incremental accrued RBA balance through September 30, 2021 (and associated revenue taxes) | 24.3
Incremental MPIR/EPRM Revenue Adjustment | 0.1
Incremental MPIR/EPRM Revenue Adjustment | 10.4
Net incremental amount to be collected under the RBA rate tariffs | 96.2
Hawaiian Electric |
Regulatory Projects and Legal Obligations [Line Items] |
2022 ARA revenues | 19.8
Management Audit savings commitment | (4.6)
Net 2022 ARA revenues | 15.2
Incremental RAM revenues and ARA revenues | 41.7
Incremental accrued RBA balance through September 30, 2021 (and associated revenue taxes) | 21.9
Incremental MPIR/EPRM Revenue Adjustment | 0.0
Incremental MPIR/EPRM Revenue Adjustment | 9.8
Net incremental amount to be collected under the RBA rate tariffs | 73.4
Hawaii Electric Light |
Regulatory Projects and Legal Obligations [Line Items] |
2022 ARA revenues | 4.9
Management Audit savings commitment | (1.0)
Net 2022 ARA revenues | 3.9
Incremental RAM revenues and ARA revenues | 8.9
Incremental accrued RBA balance through September 30, 2021 (and associated revenue taxes) | 2.5
Incremental MPIR/EPRM Revenue Adjustment | 0.0
Incremental MPIR/EPRM Revenue Adjustment | 0.3
Net incremental amount to be collected under the RBA rate tariffs | 11.7
Maui Electric |
Regulatory Projects and Legal Obligations [Line Items] |
2022 ARA revenues | 4.8
Management Audit savings commitment | (1.0)
Net 2022 ARA revenues | 3.8
Incremental RAM revenues and ARA revenues | 10.9
Incremental accrued RBA balance through September 30, 2021 (and associated revenue taxes) | (0.1)
Incremental MPIR/EPRM Revenue Adjustment | 0.1
Incremental MPIR/EPRM Revenue Adjustment | 0.3
Net incremental amount to be collected under the RBA rate tariffs | $ 11.1

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