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Short-term borrowings (Details)
12 Months Ended
May 14, 2021
USD ($)
extensionOption
institution
Jan. 29, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 29, 2020
USD ($)
May 19, 2020
USD ($)
Apr. 20, 2020
USD ($)
Dec. 31, 2021
USD ($)
instrument
Dec. 31, 2020
USD ($)
instrument
Short-term borrowings                
Outstanding amount     $ 129,379,000       $ 53,998,000 $ 129,379,000
Letter of Credit | Hamakua Energy                
Short-term borrowings                
Number of letters of credit entered into during the period | instrument             5 3
Letters of credit outstanding     6,000,000       $ 10,000,000 $ 6,000,000
HEI Facility                
Short-term borrowings                
Commitment fee percentage 0.20%              
HEI Facility | Maximum                
Short-term borrowings                
Capitalization ratio required to be maintained as per the debt covenant             50.00%  
Hawaiian Electric Facility                
Short-term borrowings                
Credit agreement $ 275,000,000              
Number of extension options | extensionOption 2              
Extension period 1 year              
Commitment fee percentage 0.175%              
Hawaiian Electric Facility | LIBOR                
Short-term borrowings                
Line of credit facility basis point spread 1.25%              
Commercial paper                
Short-term borrowings                
Outstanding amount     $ 65,000,000       $ 54,000,000 $ 65,000,000
Weighted-average interest rate     0.75%       0.55% 0.75%
Line of credit facility | Credit Facilities Effective July 2017                
Short-term borrowings                
Number of financial institutions | institution 9              
Line of credit facility basis point spread 1.375%              
Line of credit facility | HEI Facility                
Short-term borrowings                
Credit agreement $ 175,000,000              
Short-term debt, net     $ 0       $ 0 $ 0
Hawaiian Electric Company, Inc. and Subsidiaries                
Short-term borrowings                
Weighted-average interest rate     1.90%         1.90%
Short-term debt, net     $ 49,979,000       $ 0 $ 49,979,000
Hawaiian Electric Company, Inc. and Subsidiaries | Credit Facilities Effective July 2017                
Short-term borrowings                
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant 65.00%              
Hawaiian Electric Company, Inc. and Subsidiaries | HEI Facility                
Short-term borrowings                
Credit agreement $ 150,000,000              
Ratio of consolidated capitalization required to be maintained as per the debt covenant             35.00%  
Hawaiian Electric Company, Inc. and Subsidiaries | Commercial paper                
Short-term borrowings                
Outstanding amount             $ 0  
Hawaiian Electric Company, Inc. and Subsidiaries | Line of credit facility | Credit Facilities Effective July 2017                
Short-term borrowings                
Number of financial institutions | institution 9              
Hawaiian Electric Company, Inc. and Subsidiaries | Line of credit facility | Hawaiian Electric Facility                
Short-term borrowings                
Credit agreement $ 200,000,000              
Short-term debt, net     0       $ 0 $ 0
Hawaiian Electric | 364-Day Revolver | Revolving Credit Facility                
Short-term borrowings                
Credit agreement           $ 75,000,000    
Debt instrument term           364 days    
Line of credit outstanding           $ 0    
Hawaiian Electric | Term Loan | 364-Day Term Loan Credit Agreement                
Short-term borrowings                
Credit agreement         $ 50,000,000 $ 65,000,000    
Debt instrument term         364 days 364 days    
Payment of term laon     $ 50,000,000          
Proceeds from private placement       $ 50,000,000        
Extinguishment of debt amount   $ 15,000,000