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Fair value measurements (Tables)
 3 Months Ended
Mar. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Carrying or Notional Amount, Fair Value and Placement in the Fair Value Hierarchy of the Company’s Financial Instruments
The following table presents the carrying or notional amount, fair value and placement in the fair value hierarchy of the Company’s financial instruments.
Estimated fair value
(in thousands)Carrying or notional amountQuoted prices in
active markets
for identical assets
 (Level 1)		Significant
 other observable
 inputs
 (Level 2)		Total
March 31, 2025    
Financial assets    
HEI consolidated
Money market mutual funds$1,049,070 $1,049,070 $— $1,049,070 
Derivative assets28,892 — 1,114 1,114 
Hawaiian Electric consolidated
Money market mutual funds72,329 72,329 — 72,329 
Financial liabilities   
HEI consolidated
Short-term borrowings, net
48,738 — 48,738 48,738 
Long-term debt, net
2,617,963 — 2,131,016 2,131,016 
Hawaiian Electric consolidated
Short-term borrowings, net
48,738 — 48,738 48,738 
Long-term debt, net 1,809,424 — 1,377,233 1,377,233 
December 31, 2024    
Financial assets    
HEI consolidated
Money market mutual funds$1,162,259 $1,162,259 $— $1,162,259 
Derivative assets29,312 — 1,629 1,629 
Hawaiian Electric consolidated
Money market mutual funds115,599 115,599 — 115,599 
Financial liabilities   
HEI consolidated
Short-term borrowings, net
48,623 — 48,623 48,623 
Long-term debt, net
2,799,558 — 2,196,403 2,196,403 
Hawaiian Electric consolidated
Short-term borrowings, net
48,623 — 48,623 48,623 
Long-term debt, net 1,901,214 — 1,446,316 1,446,316