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Credit agreements, long-term debt and changes in long-term debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Less current portion long-term debt, net of unamortized debt issuance cost and debt discount $ (414,897) $ (109,171)
Long-term debt, net 2,203,066 2,690,387
All other    
Debt Instrument [Line Items]    
Less unamortized debt issuance costs and debt discount (4,461) (6,681)
Less current portion long-term debt, net of unamortized debt issuance cost and debt discount (414,897) (62,171)
Long-term debt, net 393,642 836,173
Hawaiian Electric Company, Inc. and Subsidiaries    
Debt Instrument [Line Items]    
Less unamortized debt issuance costs and debt discount (6,576) (6,786)
Less current portion long-term debt, net of unamortized debt issuance cost and debt discount 0 (47,000)
Long-term debt, net $ 1,809,424 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 $ 610,000 610,000
Pacific Current subsidiaries nonrecourse debt | All other    
Debt Instrument [Line Items]    
Gross long-term debt 82,500 122,025
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 $ 120,500 173,000
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 $ 121,000 166,000
HEI revolving credit facility SOFR + 1.80%, due 2026 to 2027 | Line of credit facility | Hawaiian Electric Company, Inc. and Subsidiaries | All other    
Debt Instrument [Line Items]    
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