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Electric utility segment - Regulatory Proceedings (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 23, 2020
USD ($)
Nov. 30, 2021
agreement
Dec. 31, 2022
USD ($)
MWh
project
contract
Dec. 31, 2019
USD ($)
contract
Jun. 30, 2022
USD ($)
Jun. 17, 2022
mechanism
staff
Feb. 28, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 23, 2021
mechanism
Feb. 16, 2021
contract
Dec. 31, 2020
entity
Jul. 09, 2020
agreement
Regulatory Projects and Legal Obligations [Line Items]                        
PUC proposal period 45 days                      
Public utilities, modified pilot process proposal period     15 days                  
Pilot process annual cap     $ 10,000                  
Advanced metering infrastructure utilization PIM, annual maximum reward     $ 2,000                  
Advanced metering infrastructure utilization PIM, duration     3 years                  
Hawaiian Electric Company, Inc. and Subsidiaries                        
Regulatory Projects and Legal Obligations [Line Items]                        
Number of performance incentive mechanisms of concern | mechanism           11            
Number of staff proposing penalty-only PIMs | staff           7            
Number of performance incentive mechanisms | mechanism           2     2      
Number of performance incentive mechanisms, penalty-only | mechanism           1            
Multi-year rate period 5 years                      
Customer dividend, negative adjustment percentage 0.0022%                      
Savings commitment liability, annual rate $ 6,600                      
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     0.50                  
Percentage sharing for any further difference     0.90                  
MPIR and EPRM requested amount     $ 26,200                  
EPRM number of projects approved | contract     2                  
EPRM project costs     $ 41,000                  
EPRM number of projects | project     6                  
EPRM total project costs     $ 472,000                  
2021 deferred cost recovery approved             $ 100          
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                  
Service reliability, estimated penalties     $ (100)                  
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                  
Number of contracts which qualified for incentives | contract       7                
Public utility, incentives accrued       $ 1,700       $ 100        
Number of grid service purchase agreements | agreement                       2
Number of additional power purchase contracts | contract                   1    
Number of power purchase contracts approved | agreement   2                    
Number of GSPAs approved | entity                     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                  
Penalty rate for failure to meet RPS targets (megawatt per hour) | MWh     20                  
Grid services procurement PIM, maximum reward     $ 1,500                  
Public utilities, grid services procurement performance incentive mechanism, accrued estimated rewards     40                  
Interconnection approval PIM, annual maximum reward     3,000                  
Interconnection approval PIM, annual maximum penalty     900                  
Interconnection approval PIM, accrued estimated rewards     3,000                  
Low-to-moderate income energy efficiency PIM, rewards cap     $ 2,000                  
Low-to-moderate income energy efficiency PIM, duration     3 years                  
Performance incentive mechanism, accrued estimated rewards         $ 400              
Target performance historical measurement period     10 years                  
Pending adjusted amount     $ 1,000                  
Target performance period     10 months                  
Target deadband period     2 months                  
Accrued estimated rewards, net of penalties     $ 3,400                  
Hawaiian Electric Company, Inc. and Subsidiaries | Schofield Generation Station                        
Regulatory Projects and Legal Obligations [Line Items]                        
Major project interim recovery requested amount     16,500                  
Hawaiian Electric Company, Inc. and Subsidiaries | West Loch PV Project                        
Regulatory Projects and Legal Obligations [Line Items]                        
Major project interim recovery requested amount     3,500                  
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     6,100                  
Hawaiian Electric Company, Inc. and Subsidiaries | Waiawa UFLS Project                        
Regulatory Projects and Legal Obligations [Line Items]                        
EPRM requested amount     $ 100                  
Hawaiian Electric                        
Regulatory Projects and Legal Obligations [Line Items]                        
Public utilities retained percentage     20.00%                  
Accrued estimated rewards, net of penalties     $ 2,400                  
Hawaii Electric Light                        
Regulatory Projects and Legal Obligations [Line Items]                        
Accrued estimated rewards, net of penalties     500                  
Maui Electric                        
Regulatory Projects and Legal Obligations [Line Items]                        
Accrued estimated rewards, net of penalties     $ 500