XML 70 R55.htm IDEA: XBRL DOCUMENT v3.25.2
Electric utility segment - Public Utility, Measured under Performance (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
MWh
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Regulatory Projects and Legal Obligations [Line Items]      
Interconnection requirements study PIM, estimated rewards   $ 0.0  
Hawaiian Electric Company, Inc. and Subsidiaries      
Regulatory Projects and Legal Obligations [Line Items]      
Service reliability, maximum penalty $ 3.6    
Service reliability, estimated penalties     $ (1.0)
Call center performance, pending adjusted maximum penalty 1.4    
Call center PIM, accrued estimated rewards $ 0.0    
Interpolated RPS rate goal, after year three (in dollars per MWh) | MWh 10    
Failure to meet RPS targets, penalty rate (in dollars per MWh) | MWh 20    
Accrued estimated rewards     1.9
Potential total annual maximum reward $ 3.0    
Total annual maximum penalty 0.9    
Interconnection approval PIM, accrued estimated rewards     2.4
Pending adjusted amount 1.0    
Accrued earned rewards, net of penalties $ 0.3   6.2
Hawaii Electric Light Company, Inc      
Regulatory Projects and Legal Obligations [Line Items]      
Incentives accrued     0.2
Interconnection approval PIM, accrued estimated rewards     2.8
Accrued penalties     (0.1)
Accrued earned rewards, net of penalties     3.4
Hawaiian Electric, Parent      
Regulatory Projects and Legal Obligations [Line Items]      
Public utilities retained percentage 20.00%    
Accrued earned rewards, net of penalties     2.5
Maui Electric      
Regulatory Projects and Legal Obligations [Line Items]      
Incentives accrued $ 0.3    
Accrued earned rewards, net of penalties     $ 0.3