XML 102 R75.htm IDEA: XBRL DOCUMENT v3.24.0.1
Electric utility segment - Annual Decoupling Filings (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2023
Dec. 31, 2023
Regulatory Projects and Legal Obligations [Line Items]    
2024 ARA revenues $ 24.7  
Management Audit savings commitment (6.6)  
Net 2024 ARA revenues 18.1  
Incremental RAM revenues and ARA revenues   $ 24.7
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes)   3.4
Incremental Performance Incentive Mechanisms (net)   0.1
Incremental MPIR/EPRM Revenue Adjustment   2.0
Net incremental amount to be collected under the RBA rate tariffs   30.2
Hawaiian Electric    
Regulatory Projects and Legal Obligations [Line Items]    
2024 ARA revenues 16.6  
Management Audit savings commitment (4.6)  
Net 2024 ARA revenues 12.0  
Incremental RAM revenues and ARA revenues   16.6
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes)   3.6
Incremental Performance Incentive Mechanisms (net)   0.1
Incremental MPIR/EPRM Revenue Adjustment   0.0
Net incremental amount to be collected under the RBA rate tariffs   20.3
Hawaii Electric Light    
Regulatory Projects and Legal Obligations [Line Items]    
2024 ARA revenues 4.1  
Management Audit savings commitment (1.0)  
Net 2024 ARA revenues 3.1  
Incremental RAM revenues and ARA revenues   4.1
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes)   (0.3)
Incremental Performance Incentive Mechanisms (net)   0.0
Incremental MPIR/EPRM Revenue Adjustment   0.0
Net incremental amount to be collected under the RBA rate tariffs   3.8
Maui Electric    
Regulatory Projects and Legal Obligations [Line Items]    
2024 ARA revenues 4.0  
Management Audit savings commitment (1.0)  
Net 2024 ARA revenues $ 3.0  
Incremental RAM revenues and ARA revenues   4.0
Annual change in accrued RBA balance through September 30, 2023 (and associated revenue taxes)   0.1
Incremental Performance Incentive Mechanisms (net)   0.0
Incremental MPIR/EPRM Revenue Adjustment   2.0
Net incremental amount to be collected under the RBA rate tariffs   $ 6.1