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Credit agreements, long-term debt and changes in long-term debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Less current portion long-term debt, net of unamortized debt issuance cost and debt discount $ (143,438) $ (109,171)
Long-term debt, net 1,863,936 2,690,387
All Other    
Debt Instrument [Line Items]    
Less unamortized debt issuance costs and debt discount (1,044) (6,681)
Less current portion long-term debt, net of unamortized debt issuance cost and debt discount (18,541) (62,171)
Long-term debt, net 257,201 836,173
Hawaiian Electric Company, Inc. and Subsidiaries    
Debt Instrument [Line Items]    
Less unamortized debt issuance costs and debt discount (6,368) (6,786)
Less current portion long-term debt, net of unamortized debt issuance cost and debt discount (124,897) (47,000)
Long-term debt, net $ 1,606,735 1,854,214
HEI 2.48%-6.10% senior notes due 2025-2052 | Senior Notes | Minimum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 2.48%  
HEI 2.48%-6.10% senior notes due 2025-2052 | Senior Notes | Maximum    
Debt Instrument [Line Items]    
Stated interest rate (as percent) 6.10%  
HEI 2.48%-6.10% senior notes due 2025-2052 | Senior Notes | All Other    
Debt Instrument [Line Items]    
Gross long-term debt $ 226,286 610,000
Pacific Current subsidiaries nonrecourse debt | All Other    
Debt Instrument [Line Items]    
Gross long-term debt 0 122,025
HEI revolving credit facility SOFR + 1.80%, due 2026 to 2027 | Line of credit facility | All Other    
Debt Instrument [Line Items]    
Gross long-term debt $ 50,500 173,000
Line of credit facility basis point spread (as percent) 1.80%  
HEI revolving credit facility SOFR + 1.80%, due 2026 to 2027 | Line of credit facility | Hawaiian Electric Company, Inc. and Subsidiaries    
Debt Instrument [Line Items]    
Gross long-term debt $ 43,000 166,000
Line of credit facility basis point spread (as percent) 1.80%  
Special purpose revenue bonds and unsecured senior notes | Hawaiian Electric Company, Inc. and Subsidiaries    
Debt Instrument [Line Items]    
Gross long-term debt $ 1,695,000 $ 1,742,000