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Electric utility segment - Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Nov. 01, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Utility property, plant and equipment                  
Total property, plant and equipment, net $ 6,155,343     $ 6,134,318          
Current assets                  
Cash and cash equivalents 548,242     750,535   $ 826,982      
Regulatory assets 36,032     53,895          
Total current assets 1,913,700     2,134,326          
Other long-term assets                  
Operating lease right-of-use assets 58,197     66,553          
Total assets 8,813,636     8,931,416          
Capitalization                  
Common stock equity 1,563,836 $ 1,534,432 $ 1,505,876 1,479,089   1,577,041 $ 1,085,273 $ 2,377,380 $ 2,344,841
Preferred stock of subsidiaries - not subject to mandatory redemption 34,293     34,293          
Current liabilities                  
Current portion of long-term debt, net 143,472     109,171          
Accounts payable 217,329     203,452          
Interest and dividends payable 34,691     27,203          
Regulatory liabilities 37,642     26,568          
Wildfire tort-related claims 526,500     478,750          
Other 402,034     430,824          
Total current liabilities 1,420,743     1,324,591          
Deferred credits and other liabilities                  
Operating lease liabilities 45,610     56,523          
Finance lease liabilities 509,776     426,598          
Regulatory liabilities 1,285,879     1,217,515          
Defined benefit plans liability 23,080     23,213          
Wildfire tort-related claims 1,436,250     1,436,250          
Other 198,950     242,957          
Total liabilities and shareholders’ equity 8,813,636     8,931,416          
Hawaiian Electric Consolidated                  
Utility property, plant and equipment                  
Land 52,109     52,019          
Plant and equipment 8,636,686     8,421,501          
Right-of-use assets - finance lease 540,679     447,101          
Less accumulated depreciation (3,487,595)     (3,326,624)          
Construction in progress 409,735     365,709          
Utility property, plant and equipment, net 6,151,614     5,959,706          
Nonutility property, plant and equipment, less accumulated depreciation 2,705     2,792          
Total property, plant and equipment, net 6,154,319     5,962,498          
Investment in wholly owned subsidiaries, at equity 0     0          
Current assets                  
Cash and cash equivalents 503,871     184,148   147,624      
Advances to affiliates 0     0          
Customer accounts receivable, net 192,187     199,898          
Accrued unbilled revenues, net 184,347     178,721          
Other accounts receivable, net 70,598     69,637          
Fuel oil stock, at average cost 111,203     98,903          
Materials and supplies, at average cost 132,782     118,466          
Prepayments and other 49,387     151,220          
Regulatory assets 36,032     53,895          
Total current assets 1,280,407     1,054,888          
Other long-term assets                  
Operating lease right-of-use assets 57,179     59,281          
Regulatory assets 251,205     227,424          
Defined benefit pension and other postretirement benefit plans asset 112,142     108,819          
Investment in unconsolidated affiliate 287,250     0          
Other 248,457     200,694          
Total other long-term assets 956,233     596,218          
Total assets 8,390,959     7,613,604          
Capitalization                  
Common stock equity 1,548,581 $ 1,521,617 $ 1,492,244 1,156,955   1,110,259 $ 1,192,842 $ 2,435,282 2,409,110
Preferred stock of subsidiaries - not subject to mandatory redemption 34,293     34,293          
Long-term debt, net 2,057,605     1,854,214          
Total capitalization 3,640,479     3,045,462          
Current liabilities                  
Current portion of operating lease liabilities 16,839     15,202          
Current portion of long-term debt, net 124,928     47,000          
Accounts payable 214,944     196,980          
Interest and dividends payable 28,857     21,536          
Taxes accrued, including revenue taxes 245,756     272,001          
Regulatory liabilities 37,642     26,568          
Wildfire tort-related claims 478,750     478,750 $ 479,000        
Other 123,627     121,011          
Total current liabilities 1,271,343     1,227,671          
Deferred credits and other liabilities                  
Operating lease liabilities 44,803     49,135          
Finance lease liabilities 509,776     425,625          
Deferred income taxes 0     0          
Regulatory liabilities 1,285,879     1,217,515          
Unamortized tax credits 69,839     76,676          
Defined benefit plans liability 6,444     6,428          
Wildfire tort-related claims 1,436,250     1,436,250          
Other 126,146     128,842          
Total deferred credits and other liabilities 3,479,137     3,340,471          
Total liabilities and shareholders’ equity 8,390,959     7,613,604          
Hawaiian Electric Consolidated | Nonrelated Party                  
Current liabilities                  
Short-term borrowings from non-affiliates, net 0     48,623          
Hawaiian Electric Consolidated | Affiliated Entity                  
Current liabilities                  
Short-term borrowings from non-affiliates, net 0     0          
Consolidating adjustments | Hawaiian Electric Consolidated                  
Utility property, plant and equipment                  
Land 0     0          
Plant and equipment 0     0          
Right-of-use assets - finance lease 0     0          
Less accumulated depreciation 0     0          
Construction in progress 0     0          
Utility property, plant and equipment, net 0     0          
Nonutility property, plant and equipment, less accumulated depreciation 0     0          
Total property, plant and equipment, net 0     0          
Investment in wholly owned subsidiaries, at equity (704,679)     (680,414)          
Current assets                  
Cash and cash equivalents 0     0   0      
Advances to affiliates (82,700)     (62,200)          
Customer accounts receivable, net 0     0          
Accrued unbilled revenues, net 0     0          
Other accounts receivable, net (209,959)     (249,946)          
Fuel oil stock, at average cost 0     0          
Materials and supplies, at average cost 0     0          
Prepayments and other (11,356)     (6,705)          
Regulatory assets 0     0          
Total current assets (304,015)     (318,851)          
Other long-term assets                  
Operating lease right-of-use assets 0     0          
Regulatory assets 0     0          
Defined benefit pension and other postretirement benefit plans asset (14,211)     (11,998)          
Investment in unconsolidated affiliate 0                
Other (39,300)     (33,626)          
Total other long-term assets (53,511)     (45,624)          
Total assets (1,062,205)     (1,044,889)          
Capitalization                  
Common stock equity (704,679)     (680,414)   (669,450)     (722,211)
Preferred stock of subsidiaries - not subject to mandatory redemption 0     0          
Long-term debt, net 0     0          
Total capitalization (704,679)     (680,414)          
Current liabilities                  
Current portion of operating lease liabilities 0     0          
Current portion of long-term debt, net 0     0          
Accounts payable 0     0          
Interest and dividends payable (452)     (350)          
Taxes accrued, including revenue taxes (11,356)     (6,705)          
Regulatory liabilities 0     0          
Wildfire tort-related claims 0     0          
Other (209,507)     (249,597)          
Total current liabilities (304,015)     (318,852)          
Deferred credits and other liabilities                  
Operating lease liabilities 0     0          
Finance lease liabilities 0     0          
Deferred income taxes (39,300)     (33,625)          
Regulatory liabilities 0     0          
Unamortized tax credits 0     0          
Defined benefit plans liability (14,211)     (11,998)          
Wildfire tort-related claims 0     0          
Other 0     0          
Total deferred credits and other liabilities (53,511)     (45,623)          
Total liabilities and shareholders’ equity (1,062,205)     (1,044,889)          
Consolidating adjustments | Hawaiian Electric Consolidated | Nonrelated Party                  
Current liabilities                  
Short-term borrowings from non-affiliates, net       0          
Consolidating adjustments | Hawaiian Electric Consolidated | Affiliated Entity                  
Current liabilities                  
Short-term borrowings from non-affiliates, net (82,700)     (62,200)          
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated                  
Utility property, plant and equipment                  
Land 42,860     42,860          
Plant and equipment 5,626,713     5,502,198          
Right-of-use assets - finance lease 411,545     360,270          
Less accumulated depreciation (2,146,647)     (2,029,719)          
Construction in progress 296,046     282,150          
Utility property, plant and equipment, net 4,230,517     4,157,759          
Nonutility property, plant and equipment, less accumulated depreciation 1,146     1,145          
Total property, plant and equipment, net 4,231,663     4,158,904          
Investment in wholly owned subsidiaries, at equity 704,679     680,414          
Current assets                  
Cash and cash equivalents 449,024     118,367   99,392      
Advances to affiliates 82,700     62,200          
Customer accounts receivable, net 18,205     19,050          
Accrued unbilled revenues, net 18,393     12,738          
Other accounts receivable, net 177,464     209,752          
Fuel oil stock, at average cost 79,663     70,800          
Materials and supplies, at average cost 75,551     69,602          
Prepayments and other 32,991     110,516          
Regulatory assets 26,049     36,520          
Total current assets 960,040     709,545          
Other long-term assets                  
Operating lease right-of-use assets 33,285     29,868          
Regulatory assets 182,734     172,257          
Defined benefit pension and other postretirement benefit plans asset 70,503     66,292          
Investment in unconsolidated affiliate 287,250                
Other 236,148     194,006          
Total other long-term assets 809,920     462,423          
Total assets 6,706,302     6,011,286          
Capitalization                  
Common stock equity 1,548,581     1,156,955   1,110,259     2,409,110
Preferred stock of subsidiaries - not subject to mandatory redemption 22,293     22,293          
Long-term debt, net 1,619,250     1,353,173          
Total capitalization 3,190,124     2,532,421          
Current liabilities                  
Current portion of operating lease liabilities 5,199     4,430          
Current portion of long-term debt, net 61,964     40,000          
Accounts payable 136,272     137,837          
Interest and dividends payable 21,257     15,994          
Taxes accrued, including revenue taxes 181,990     197,768          
Regulatory liabilities 14,936     11,701          
Wildfire tort-related claims 383,000     383,000          
Other 94,425     103,415          
Total current liabilities 899,043     942,768          
Deferred credits and other liabilities                  
Operating lease liabilities 31,988     29,830          
Finance lease liabilities 384,785     341,364          
Deferred income taxes 0     0          
Regulatory liabilities 906,257     864,259          
Unamortized tax credits 49,387     54,950          
Defined benefit plans liability 20,531     18,301          
Wildfire tort-related claims 1,149,000     1,149,000          
Other 75,187     78,393          
Total deferred credits and other liabilities 2,617,135     2,536,097          
Total liabilities and shareholders’ equity 6,706,302     6,011,286          
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party                  
Current liabilities                  
Short-term borrowings from non-affiliates, net       48,623          
Hawaiian Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity                  
Current liabilities                  
Short-term borrowings from non-affiliates, net 0     0          
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated                  
Utility property, plant and equipment                  
Land 5,646     5,645          
Plant and equipment 1,539,937     1,501,947          
Right-of-use assets - finance lease 78,377     36,074          
Less accumulated depreciation (715,344)     (691,161)          
Construction in progress 45,987     31,341          
Utility property, plant and equipment, net 954,603     883,846          
Nonutility property, plant and equipment, less accumulated depreciation 115     115          
Total property, plant and equipment, net 954,718     883,961          
Investment in wholly owned subsidiaries, at equity 0     0          
Current assets                  
Cash and cash equivalents 36,737     31,534   25,734      
Advances to affiliates 0     0          
Customer accounts receivable, net 3,618     7,245          
Accrued unbilled revenues, net 5,597     4,046          
Other accounts receivable, net 54,672     58,366          
Fuel oil stock, at average cost 13,587     13,764          
Materials and supplies, at average cost 18,107     15,506          
Prepayments and other 7,578     16,662          
Regulatory assets 6,019     8,211          
Total current assets 145,915     155,334          
Other long-term assets                  
Operating lease right-of-use assets 18,232     22,672          
Regulatory assets 22,385     18,875          
Defined benefit pension and other postretirement benefit plans asset 31,162     30,397          
Investment in unconsolidated affiliate 0                
Other 21,282     18,612          
Total other long-term assets 93,061     90,556          
Total assets 1,193,694     1,129,851          
Capitalization                  
Common stock equity 258,653     243,964   237,105     359,790
Preferred stock of subsidiaries - not subject to mandatory redemption 7,000     7,000          
Long-term debt, net 236,594     244,466          
Total capitalization 502,247     495,430          
Current liabilities                  
Current portion of operating lease liabilities 8,410     7,802          
Current portion of long-term debt, net 7,995     5,000          
Accounts payable 40,629     27,077          
Interest and dividends payable 3,698     3,191          
Taxes accrued, including revenue taxes 37,853     42,692          
Regulatory liabilities 10,897     10,039          
Wildfire tort-related claims 47,875     47,875          
Other 32,763     35,492          
Total current liabilities 190,120     179,168          
Deferred credits and other liabilities                  
Operating lease liabilities 10,132     15,230          
Finance lease liabilities 75,556     34,370          
Deferred income taxes 8,711     5,368          
Regulatory liabilities 231,965     222,834          
Unamortized tax credits 10,017     10,757          
Defined benefit plans liability 124     125          
Wildfire tort-related claims 143,625     143,625          
Other 21,197     22,944          
Total deferred credits and other liabilities 501,327     455,253          
Total liabilities and shareholders’ equity 1,193,694     1,129,851          
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party                  
Current liabilities                  
Short-term borrowings from non-affiliates, net       0          
Hawaii Electric Light | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity                  
Current liabilities                  
Short-term borrowings from non-affiliates, net 0     0          
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated                  
Utility property, plant and equipment                  
Land 3,603     3,514          
Plant and equipment 1,470,036     1,417,356          
Right-of-use assets - finance lease 50,757     50,757          
Less accumulated depreciation (625,604)     (605,744)          
Construction in progress 67,702     52,218          
Utility property, plant and equipment, net 966,494     918,101          
Nonutility property, plant and equipment, less accumulated depreciation 1,444     1,532          
Total property, plant and equipment, net 967,938     919,633          
Investment in wholly owned subsidiaries, at equity 0     0          
Current assets                  
Cash and cash equivalents 3,834     16,456   11,833      
Advances to affiliates 0     0          
Customer accounts receivable, net 7,105     8,941          
Accrued unbilled revenues, net 1,212     1,890          
Other accounts receivable, net 48,421     51,465          
Fuel oil stock, at average cost 17,953     14,339          
Materials and supplies, at average cost 39,124     33,358          
Prepayments and other 20,174     30,747          
Regulatory assets 3,964     9,164          
Total current assets 141,787     166,360          
Other long-term assets                  
Operating lease right-of-use assets 5,662     6,741          
Regulatory assets 46,086     36,292          
Defined benefit pension and other postretirement benefit plans asset 24,688     24,128          
Investment in unconsolidated affiliate 0                
Other 30,327     21,702          
Total other long-term assets 106,763     88,863          
Total assets 1,216,488     1,174,856          
Capitalization                  
Common stock equity 288,206     282,876   280,629     362,344
Preferred stock of subsidiaries - not subject to mandatory redemption 5,000     5,000          
Long-term debt, net 201,761     256,575          
Total capitalization 494,967     544,451          
Current liabilities                  
Current portion of operating lease liabilities 3,230     2,970          
Current portion of long-term debt, net 54,969     2,000          
Accounts payable 38,043     32,066          
Interest and dividends payable 4,354     2,701          
Taxes accrued, including revenue taxes 34,658     37,108          
Regulatory liabilities 11,809     4,828          
Wildfire tort-related claims 47,875     47,875          
Other 29,697     43,913          
Total current liabilities 307,335     235,661          
Deferred credits and other liabilities                  
Operating lease liabilities 2,683     4,075          
Finance lease liabilities 49,435     49,891          
Deferred income taxes 30,589     28,257          
Regulatory liabilities 147,657     130,422          
Unamortized tax credits 10,435     10,969          
Defined benefit plans liability 0     0          
Wildfire tort-related claims 143,625     143,625          
Other 29,762     27,505          
Total deferred credits and other liabilities 414,186     394,744          
Total liabilities and shareholders’ equity 1,216,488     1,174,856          
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party                  
Current liabilities                  
Short-term borrowings from non-affiliates, net       0          
Maui Electric | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity                  
Current liabilities                  
Short-term borrowings from non-affiliates, net 82,700     62,200          
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated                  
Utility property, plant and equipment                  
Land 0     0          
Plant and equipment 0     0          
Right-of-use assets - finance lease 0     0          
Less accumulated depreciation 0     0          
Construction in progress 0     0          
Utility property, plant and equipment, net 0     0          
Nonutility property, plant and equipment, less accumulated depreciation 0     0          
Total property, plant and equipment, net 0     0          
Investment in wholly owned subsidiaries, at equity 0     0          
Current assets                  
Cash and cash equivalents 14,276     17,791   10,665      
Advances to affiliates 0     0          
Customer accounts receivable, net 163,259     164,662          
Accrued unbilled revenues, net 159,145     160,047          
Other accounts receivable, net 0     0          
Fuel oil stock, at average cost 0     0          
Materials and supplies, at average cost 0     0          
Prepayments and other 0     0          
Regulatory assets 0     0          
Total current assets 336,680     342,500          
Other long-term assets                  
Operating lease right-of-use assets 0     0          
Regulatory assets 0     0          
Defined benefit pension and other postretirement benefit plans asset 0     0          
Investment in unconsolidated affiliate 0                
Other 0     0          
Total other long-term assets 0     0          
Total assets 336,680     342,500          
Capitalization                  
Common stock equity 157,820     153,574   $ 151,716     $ 77
Preferred stock of subsidiaries - not subject to mandatory redemption 0     0          
Long-term debt, net 0     0          
Total capitalization 157,820     153,574          
Current liabilities                  
Current portion of operating lease liabilities 0     0          
Current portion of long-term debt, net 0     0          
Accounts payable 0     0          
Interest and dividends payable 0     0          
Taxes accrued, including revenue taxes 2,611     1,138          
Regulatory liabilities 0     0          
Wildfire tort-related claims 0     0          
Other 176,249     187,788          
Total current liabilities 178,860     188,926          
Deferred credits and other liabilities                  
Operating lease liabilities 0     0          
Finance lease liabilities 0     0          
Deferred income taxes 0     0          
Regulatory liabilities 0     0          
Unamortized tax credits 0     0          
Defined benefit plans liability 0     0          
Wildfire tort-related claims 0     0          
Other 0     0          
Total deferred credits and other liabilities 0     0          
Total liabilities and shareholders’ equity 336,680     342,500          
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated | Nonrelated Party                  
Current liabilities                  
Short-term borrowings from non-affiliates, net       0          
Other subsidiaries | Reportable Legal Entities | Hawaiian Electric Consolidated | Affiliated Entity                  
Current liabilities                  
Short-term borrowings from non-affiliates, net $ 0     $ 0