Fair value measurements (Tables)

12 Months Ended

Dec. 31, 2024

Fair Value Disclosures [Abstract]

Schedule of Estimated Fair Values of Certain 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 amount		Quoted prices in active markets for identical assets  (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
December 31, 2024
Financial assets
HEI consolidated
Money market mutual funds	$	1,162,259	$	1,162,259	$	—	$	—	$	1,162,259
Derivative assets	29,312		—		1,629		—		1,629
Hawaiian Electric consolidated
Money market mutual funds	115,599		115,599		—		—		115,599
Financial liabilities
HEI consolidated
Short-term borrowings	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	48,623		—		48,623		—		48,623
Long-term debt, net	1,901,214		—		1,446,316		—		1,446,316
December 31, 2023
Financial assets
HEI consolidated
Money market mutual funds	$	226,085	$	226,085	$	—	$	—	$	226,085
Derivative assets	10,634		—		972		—		972
Hawaiian Electric consolidated
Money market mutual funds	85,807		85,807		—		—		85,807
Financial liabilities
HEI consolidated
Long-term debt, net	2,842,429		—		2,133,225		—		2,133,225
Derivative liabilities	22,949		—		303		—		303
Hawaiian Electric consolidated
Long-term debt, net	1,934,277		—		1,385,025		—		1,385,025