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Fair value measurements (Tables)
 6 Months Ended
Jun. 30, 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
June 30, 2025    
Financial assets    
HEI consolidated
Money market mutual funds$579,156 $579,156 $— $579,156 
Derivative assets28,460 — 811 811 
Hawaiian Electric consolidated
Money market mutual funds53,481 53,481 — 53,481 
Financial liabilities   
HEI consolidated
Short-term borrowings, net
49,312 — 49,312 49,312 
Long-term debt, net
2,007,374 — 1,677,039 1,677,039 
Hawaiian Electric consolidated
Short-term borrowings, net
49,312 — 49,312 49,312 
Long-term debt, net 1,731,632 — 1,428,577 1,428,577 
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