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Revenue from contracts with customers - Schedule of Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 678,020 $ 588,204
Other revenues (3,187) 71
Total external operating revenues 674,833 588,275
Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (33,787) (30,364)
Total external operating revenues (33,787) (30,364)
Operating Segments    
Disaggregation of Revenue [Line Items]    
Total external operating revenues 708,441 618,602
Natural gas transportation    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 66,963 58,228
Natural gas storage    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,030 5,382
Other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 42,610 21,124
Residential utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 328,920 302,325
Commercial utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 240,808 203,645
Industrial utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 24,626 25,928
Other utility sales    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,850 1,936
Electric | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (178) (12)
Total external operating revenues (178) (12)
Electric | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 116,589 109,640
Other revenues (4,328) (1,897)
Total external operating revenues 112,261 107,743
Electric | Natural gas transportation | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Electric | Natural gas storage | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Electric | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 17,591 15,630
Electric | Residential utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 39,685 39,222
Electric | Commercial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 48,477 41,515
Electric | Industrial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 9,164 11,349
Electric | Other utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,850 1,936
Natural gas distribution | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (94) (41)
Total external operating revenues (94) (41)
Natural gas distribution | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 538,122 457,563
Other revenues 1,126 1,921
Total external operating revenues 539,248 459,484
Natural gas distribution | Natural gas transportation | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 17,710 14,591
Natural gas distribution | Natural gas storage | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Natural gas distribution | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 23,478 3,201
Natural gas distribution | Residential utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 289,235 263,103
Natural gas distribution | Commercial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 192,331 162,130
Natural gas distribution | Industrial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 15,462 14,579
Natural gas distribution | Other utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Pipeline | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (33,337) (30,290)
Total external operating revenues (33,337) (30,290)
Pipeline | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 23,308 20,985
Other revenues 15 47
Total external operating revenues 23,323 21,032
Pipeline | Natural gas transportation | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 49,253 43,637
Pipeline | Natural gas storage | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 6,030 5,382
Pipeline | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,362 2,256
Pipeline | Residential utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Pipeline | Commercial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Pipeline | Industrial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Pipeline | Other utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other | Intersegment eliminations    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers (178) (21)
Total external operating revenues (178) (21)
Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1 16
Other revenues 0 0
Total external operating revenues 1 16
Other | Natural gas transportation | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other | Natural gas storage | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other | Other | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 179 37
Other | Residential utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other | Commercial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other | Industrial utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Other | Other utility sales | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 0 $ 0