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Fair value measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Carrying or notional amount    
Financial assets    
Derivative assets $ 28,460 $ 29,312
Financial liabilities    
Short-term borrowings, net 49,312 48,623
Long-term debt, net 2,007,374 2,799,558
Carrying or notional amount | Money Market Funds    
Financial assets    
Money market mutual funds 579,156 1,162,259
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings, net 49,312 48,623
Long-term debt, net 1,731,632 1,901,214
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries | Money Market Funds    
Financial assets    
Money market mutual funds 53,481 115,599
Estimated fair value    
Financial assets    
Derivative assets $ 811 $ 1,629
Derivative asset, statement of financial position Other Other
Financial liabilities    
Short-term borrowings, net $ 49,312 $ 48,623
Long-term debt, net 1,677,039 2,196,403
Estimated fair value | Money Market Funds    
Financial assets    
Money market mutual funds 579,156 1,162,259
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings, net 49,312 48,623
Long-term debt, net 1,428,577 1,446,316
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries | Money Market Funds    
Financial assets    
Money market mutual funds 53,481 115,599
Estimated fair value | Quoted prices in active markets for identical assets (Level 1)    
Financial assets    
Derivative assets 0 0
Financial liabilities    
Short-term borrowings, net 0 0
Long-term debt, net 0 0
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) | Money Market Funds    
Financial assets    
Money market mutual funds 579,156 1,162,259
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings, net 0 0
Long-term debt, net 0 0
Estimated fair value | Quoted prices in active markets for identical assets (Level 1) | Hawaiian Electric Company, Inc. and Subsidiaries | Money Market Funds    
Financial assets    
Money market mutual funds 53,481 115,599
Estimated fair value | Significant  other observable  inputs (Level 2)    
Financial assets    
Derivative assets 811 1,629
Financial liabilities    
Short-term borrowings, net 49,312 48,623
Long-term debt, net 1,677,039 2,196,403
Estimated fair value | Significant  other observable  inputs (Level 2) | Money Market Funds    
Financial assets    
Money market mutual funds 0 0
Estimated fair value | Significant  other observable  inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial liabilities    
Short-term borrowings, net 49,312 48,623
Long-term debt, net 1,428,577 1,446,316
Estimated fair value | Significant  other observable  inputs (Level 2) | Hawaiian Electric Company, Inc. and Subsidiaries | Money Market Funds    
Financial assets    
Money market mutual funds $ 0 $ 0