v3.26.1
Segment Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
mi²
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
mi²
segment
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Segment Reporting [Line Items]              
Number of Reportable Segments | segment         1    
Number of Operating Segments | segment         1    
Area of Service Territory (in sqmi) | mi² 6,000       6,000    
Revenue $ 1,312,804   $ 1,120,465   $ 3,161,061 $ 2,722,468  
Depreciation and amortization 212,665   209,536   425,028 419,912  
Income tax (benefit) expense 10,382   (935)   36,111 19,563  
Non-utility expense and other 8,289   17,414   21,042 32,741  
Interest expense 134,603   116,201   257,870 228,863  
Net income (loss) 49,699 $ 222,832 44,174 $ 167,556 272,531 211,730  
Total assets 21,643,268   19,236,321   21,643,268 19,236,321 $ 20,906,793
Construction expenditures 438,976   376,743   851,190 730,325  
Natural gas 287,903   270,370   867,053 835,297  
Puget LNG              
Segment Reporting [Line Items]              
Natural gas         1,500 2,000  
Reportable Segment, Aggregation before Other Operating Segment              
Segment Reporting [Line Items]              
Revenue 1,303,916   1,110,972   3,144,434 2,703,992  
Depreciation and amortization 210,996   207,852   421,684 416,545  
Income tax (benefit) expense 16,515   4,410   54,368 32,225  
Non-utility expense and other 4,192   10,470   9,818 19,245  
Interest expense 92,257   84,637   183,141 169,557  
Net income (loss) 79,745   68,320   326,183 254,334  
Total assets 19,195,602   17,310,818   19,195,602 17,310,818  
Construction expenditures 438,912   376,611   851,110 730,046  
Other Operating Segment              
Segment Reporting [Line Items]              
Revenue 8,888   9,493   16,627 18,476  
Depreciation and amortization 1,669   1,684   3,344 3,367  
Income tax (benefit) expense (6,133)   (5,345)   (18,257) (12,662)  
Non-utility expense and other 4,097   6,944   11,224 13,496  
Interest expense 42,346   31,564   74,729 59,306  
Net income (loss) (30,046)   (24,146)   (53,652) (42,604)  
Total assets 2,447,666   1,925,503   2,447,666 1,925,503  
Construction expenditures $ 64   $ 132   $ 80 $ 279