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Credit agreements (Details)
May 14, 2021
USD ($)
extensionOption
institution
Apr. 19, 2021
USD ($)
Jun. 30, 2021
USD ($)
May 13, 2021
USD ($)
Dec. 31, 2020
USD ($)
HEI Facility          
Credit agreement          
Annual fees 0.20%        
HEI Facility | LIBOR          
Credit agreement          
Basis spread on variable rate 1.375%        
Hawaiian Electric Facility          
Credit agreement          
Credit agreement $ 200,000,000     $ 275,000,000  
Number of extension options | extensionOption 2        
Extension period 1 year        
Annual fees 0.175%        
Hawaiian Electric Facility | LIBOR          
Credit agreement          
Basis spread on variable rate 1.25%        
Hawaiian Electric Company, Inc. and Subsidiaries          
Credit agreement          
Short-term borrowings from non-affiliates     $ 37,999,000   $ 49,979,000
Hawaiian Electric Company, Inc. and Subsidiaries | Credit Facilities          
Credit agreement          
Number of financial institutions | institution 9        
Line of credit outstanding     $ 0   $ 0
Debt to capitalization ratios 0.65        
Capitalization ratio 0.50        
Consolidation capitalization ratio 0.35        
Hawaiian Electric Company, Inc. and Subsidiaries | HEI Facility          
Credit agreement          
Credit agreement $ 175,000,000     $ 150,000,000  
Hawaiian Electric, Parent | 364-Day Revolver | Revolving Credit Facility | Line of credit facility          
Credit agreement          
Maximum borrowing   $ 75,000,000      
Debt term   364 days      
Short-term borrowings from non-affiliates   $ 0