Consolidated Statements of Capitalization - HECO - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Common stock equity
Retained earnings	$ (788,916)	$ 926,720
Accumulated other comprehensive income, net of taxes-retirement benefit plans	1,341	(8,025)
Total shareholders’ equity	1,479,089	2,344,841
Cumulative preferred stock – not subject to mandatory redemption	34,293	34,293
Less current portion long-term debt, net of unamortized debt issuance costs	$ 109,171	$ 16,496
Common stock, outstanding shares (in shares)	172,465,608	110,151,798
Hawaiian Electric Company, Inc. and Subsidiaries
Common stock equity
Common stock of $6 2/3 par value, Authorized: 50,000,000 shares. Outstanding: 17,854,278 shares at December 31, 2024 and 2023	$ 119,048	$ 119,048
Premium on capital stock	810,955	810,955
Retained earnings	223,896	1,476,258
Additional paid-in capital	270	0
Accumulated other comprehensive income, net of taxes-retirement benefit plans	2,786	2,849
Total shareholders’ equity	$ 1,156,955	$ 2,409,110
Shares outstanding (in shares)	1,234,657	1,234,657
Cumulative preferred stock – not subject to mandatory redemption	$ 34,293	$ 34,293
Long-term debt	1,908,000	1,942,000
Less unamortized debt issuance costs	6,786	7,723
Less current portion long-term debt, net of unamortized debt issuance costs	47,000	0
Long-term debt, net	1,854,214	1,934,277
Total capitalization	$ 3,045,462	$ 4,377,680
Common stock, outstanding shares (in shares)	17,854,278	17,854,278
Hawaiian Electric Company, Inc. and Subsidiaries | Special Purpose Revenue Bonds
Common stock equity
Long-term debt	$ 542,000	$ 542,000
Hawaiian Electric Company, Inc. and Subsidiaries | Special Purpose Revenue Bonds | 3.50%, Series 2019, due 2049
Common stock equity
Long-term debt	$ 80,000	80,000
Debt instrument, stated interest rate (as percent)	3.50%
Hawaiian Electric Company, Inc. and Subsidiaries | Special Purpose Revenue Bonds | 3.20%, Refunding series 2019, due 2039
Common stock equity
Long-term debt	$ 150,000	150,000
Debt instrument, stated interest rate (as percent)	3.20%
Hawaiian Electric Company, Inc. and Subsidiaries | Special Purpose Revenue Bonds | 3.10%, Refunding series 2017A, due 2026
Common stock equity
Long-term debt	$ 125,000	125,000
Debt instrument, stated interest rate (as percent)	3.10%
Hawaiian Electric Company, Inc. and Subsidiaries | Special Purpose Revenue Bonds | 4.00%, Refunding series 2017B, due 2037
Common stock equity
Long-term debt	$ 140,000	140,000
Debt instrument, stated interest rate (as percent)	4.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Special Purpose Revenue Bonds | 3.25%, Refunding series 2015, due 2025
Common stock equity
Long-term debt	$ 47,000	47,000
Debt instrument, stated interest rate (as percent)	3.25%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes
Common stock equity
Long-term debt	$ 1,200,000	1,200,000
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 6.11%, Series 2023A, due 2030
Common stock equity
Long-term debt	$ 40,000	40,000
Debt instrument, stated interest rate (as percent)	6.11%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 6.25%, Series 2023A and 2023B, due 2033
Common stock equity
Long-term debt	$ 90,000	90,000
Debt instrument, stated interest rate (as percent)	6.25%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 6.70%, Series 2023C, due 2053
Common stock equity
Long-term debt	$ 20,000	20,000
Debt instrument, stated interest rate (as percent)	6.70%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 3.70%, Series 2022A, due 2032
Common stock equity
Long-term debt	$ 60,000	60,000
Debt instrument, stated interest rate (as percent)	3.70%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 3.51%, Series 2020C and 2020E, due 2050
Common stock equity
Long-term debt	$ 70,000	70,000
Debt instrument, stated interest rate (as percent)	3.51%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 3.28%, Series 2020B and 2020D, due 2040
Common stock equity
Long-term debt	$ 45,000	45,000
Debt instrument, stated interest rate (as percent)	3.28%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 3.96%, Series 2020A, 2020B and 2020C, due 2050
Common stock equity
Long-term debt	$ 50,000	50,000
Debt instrument, stated interest rate (as percent)	3.96%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 3.31%, Series 2020A and 2020B, due 2030
Common stock equity
Long-term debt	$ 110,000	110,000
Debt instrument, stated interest rate (as percent)	3.31%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.21%, Series 2019A, due 2034
Common stock equity
Long-term debt	$ 50,000	50,000
Debt instrument, stated interest rate (as percent)	4.21%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.38%, Series 2018A, due 2028
Common stock equity
Long-term debt	$ 67,500	67,500
Debt instrument, stated interest rate (as percent)	4.38%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.53%, Series 2018B, due 2033
Common stock equity
Long-term debt	$ 17,500	17,500
Debt instrument, stated interest rate (as percent)	4.53%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.72%, Series 2018C, due 2048
Common stock equity
Long-term debt	$ 15,000	15,000
Debt instrument, stated interest rate (as percent)	4.72%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.31%, Series 2017A, due 2047
Common stock equity
Long-term debt	$ 50,000	50,000
Debt instrument, stated interest rate (as percent)	4.31%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.54%, Series 2016A, due 2046
Common stock equity
Long-term debt	$ 40,000	40,000
Debt instrument, stated interest rate (as percent)	4.54%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 5.23%, Series 2015A, due 2045
Common stock equity
Long-term debt	$ 80,000	80,000
Debt instrument, stated interest rate (as percent)	5.23%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.84%, Series 2013A, 2013B and 2013C, due 2027
Common stock equity
Long-term debt	$ 100,000	100,000
Debt instrument, stated interest rate (as percent)	4.84%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 5.65%, Series 2013B and 2013C, due 2043
Common stock equity
Long-term debt	$ 70,000	70,000
Debt instrument, stated interest rate (as percent)	5.65%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.72%, Series 2012D, due 2029
Common stock equity
Long-term debt	$ 35,000	35,000
Debt instrument, stated interest rate (as percent)	4.72%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 5.39%, Series 2012E, due 2042
Common stock equity
Long-term debt	$ 150,000	150,000
Debt instrument, stated interest rate (as percent)	5.39%
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes | 4.53%, Series 2012F, due 2032
Common stock equity
Long-term debt	$ 40,000	40,000
Debt instrument, stated interest rate (as percent)	4.53%
Hawaiian Electric Company, Inc. and Subsidiaries | Line of credit facility | Revolving credit facility SOFR +1.80%, due 2026 and 2027
Common stock equity
Long-term debt	$ 166,000	$ 200,000
Debt instrument, stated interest rate (as percent)	1.80%
Hawaiian Electric Company, Inc. and Subsidiaries | Preferred Stock $20 Par Value
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Hawaiian Electric Company, Inc. and Subsidiaries | Preferred Stock $100 Par Value
Common stock equity
Par value (in dollars per share)	100	100
Hawaiian Electric | Series C, 4.25% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	150,000	150,000
Cumulative preferred stock – not subject to mandatory redemption	$ 3,000	$ 3,000
Hawaiian Electric | Series D, 5.00% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	50,000	50,000
Cumulative preferred stock – not subject to mandatory redemption	$ 1,000	$ 1,000
Hawaiian Electric | Series E, 5.00% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	150,000	150,000
Cumulative preferred stock – not subject to mandatory redemption	$ 3,000	$ 3,000
Hawaiian Electric | Series H, 5.25% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	250,000	250,000
Cumulative preferred stock – not subject to mandatory redemption	$ 5,000	$ 5,000
Hawaiian Electric | Series I, 5.00% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	89,657	89,657
Cumulative preferred stock – not subject to mandatory redemption	$ 1,793	$ 1,793
Hawaiian Electric | Series J, 4.75% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	250,000	250,000
Cumulative preferred stock – not subject to mandatory redemption	$ 5,000	$ 5,000
Hawaiian Electric | Series K, 4.65% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 20	$ 20
Shares outstanding (in shares)	175,000	175,000
Cumulative preferred stock – not subject to mandatory redemption	$ 3,500	$ 3,500
Hawaii Electric Light | Series G, 7.625% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 100	$ 100
Shares outstanding (in shares)	70,000	70,000
Cumulative preferred stock – not subject to mandatory redemption	$ 7,000	$ 7,000
Maui Electric | Series H, 7.625% Preferred Stock
Common stock equity
Par value (in dollars per share)	$ 100	$ 100
Shares outstanding (in shares)	50,000	50,000
Cumulative preferred stock – not subject to mandatory redemption	$ 5,000	$ 5,000