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Business segment data (Tables) | 6 Months Ended
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Jun. 30, 2025
Segment Reporting [Abstract] |
Schedule of Information on the Company's Businesses | Information on the Company's segments was as follows:
Three Months Ended June 30, 2025 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 97,886 |  |  | $ | 206,794 |  |  | $ | 46,507 |  |  | $ | (1) |  |  | $ | 351,186 |
Intersegment operating revenues | 140 |  |  | 92 |  |  | 9,796 |  |  | 180 |  |  | 10,208 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 96,057 |  |  | — |  |  | — |  |  | 96,057 |
Intersegment purchased natural gas sold | — |  |  | 9,751 |  |  | — |  |  | — |  |  | 9,751 |
Electric fuel and purchased power | 34,891 |  |  | — |  |  | — |  |  | — |  |  | 34,891 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 29,823 |  |  | 60,456 |  |  | 22,352 |  |  | 256 |  |  | 112,887 |
Intersegment operation and maintenance | 140 |  |  | 92 |  |  | 45 |  |  | 180 |  |  | 457 |
Depreciation and amortization | 17,393 |  |  | 26,471 |  |  | 7,989 |  |  | — |  |  | 51,853 |
Taxes, other than income | 4,648 |  |  | 16,935 |  |  | 3,583 |  |  | — |  |  | 25,166 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 2,726 |  |  | 5,095 |  |  | 1,616 |  |  | 508 |  |  | 9,945 |
Intersegment other income | — |  |  | — |  |  | 90 |  |  | 1,061 |  |  | 1,151 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 7,614 |  |  | 13,745 |  |  | 3,135 |  |  | 951 |  |  | 25,445 |
Intersegment interest expense | — |  |  | — |  |  | 1,151 |  |  | — |  |  | 1,151 |
Income tax expense (benefit) | (4,254) |  |  | (4,170) |  |  | 4,337 |  |  | 4,742 |  |  | 655 |
Income (loss) from continuing operations | 10,497 |  |  | (7,356) |  |  | 15,417 |  |  | (4,381) |  |  | 14,177 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | (397) |  |  | (397) |
Net income (loss) | $ | 10,497 |  |  | $ | (7,356) |  |  | $ | 15,417 |  |  | $ | (4,778) |  |  | $ | 13,780 |
Three Months Ended June 30, 2024 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 99,173 |  |  | $ | 201,445 |  |  | $ | 43,851 |  |  | $ | 2 |  |  | $ | 344,471 |
Intersegment operating revenues | 48 |  |  | 35 |  |  | 9,035 |  |  | 20 |  |  | 9,138 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 94,591 |  |  | — |  |  | — |  |  | 94,591 |
Intersegment purchased natural gas sold | — |  |  | 8,825 |  |  | — |  |  | — |  |  | 8,825 |
Electric fuel and purchased power | 36,692 |  |  | — |  |  | — |  |  | — |  |  | 36,692 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 23,100 |  |  | 54,919 |  |  | 19,079 |  |  | 2,857 |  |  | 99,955 |
Intersegment operation and maintenance | 48 |  |  | 35 |  |  | 210 |  |  | 20 |  |  | 313 |
Depreciation and amortization | 16,220 |  |  | 25,548 |  |  | 7,318 |  |  | 604 |  |  | 49,690 |
Taxes, other than income | 4,530 |  |  | 16,358 |  |  | 3,007 |  |  | 74 |  |  | 23,969 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 2,065 |  |  | 5,350 |  |  | 2,729 |  |  | 219 |  |  | 10,363 |
Intersegment other income | — |  |  | — |  |  | 332 |  |  | 4,071 |  |  | 4,403 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 7,226 |  |  | 15,364 |  |  | 2,708 |  |  | 1,202 |  |  | 26,500 |
Intersegment interest expense | — |  |  | — |  |  | 1,071 |  |  | 3,332 |  |  | 4,403 |
Income tax expense (benefit) | (2,057) |  |  | (3,803) |  |  | 5,295 |  |  | 3,760 |  |  | 3,195 |
Income (loss) from continuing operations | 15,527 |  |  | (5,007) |  |  | 17,259 |  |  | (7,537) |  |  | 20,242 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | 40,194 |  |  | 40,194 |
Net income (loss) | $ | 15,527 |  |  | $ | (5,007) |  |  | $ | 17,259 |  |  | $ | 32,657 |  |  | $ | 60,436 |
Six Months Ended June 30, 2025 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 210,147 |  |  | $ | 746,041 |  |  | $ | 69,831 |  |  | $ | — |  |  | $ | 1,026,019 |
Intersegment operating revenues | 318 |  |  | 187 |  |  | 43,132 |  |  | 358 |  |  | 43,995 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 413,214 |  |  | — |  |  | — |  |  | 413,214 |
Intersegment purchased natural gas sold | — |  |  | 43,074 |  |  | — |  |  | — |  |  | 43,074 |
Electric fuel and purchased power | 78,639 |  |  | — |  |  | — |  |  | — |  |  | 78,639 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 58,230 |  |  | 123,939 |  |  | 41,592 |  |  | 173 |  |  | 223,934 |
Intersegment operation and maintenance | 318 |  |  | 187 |  |  | 58 |  |  | 358 |  |  | 921 |
Depreciation and amortization | 34,576 |  |  | 52,593 |  |  | 15,945 |  |  | — |  |  | 103,114 |
Taxes, other than income | 9,463 |  |  | 47,563 |  |  | 6,897 |  |  | — |  |  | 63,923 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 3,718 |  |  | 8,396 |  |  | 1,923 |  |  | 905 |  |  | 14,942 |
Intersegment other income | — |  |  | — |  |  | 213 |  |  | 2,047 |  |  | 2,260 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 15,501 |  |  | 28,621 |  |  | 6,256 |  |  | 1,889 |  |  | 52,267 |
Intersegment interest expense | — |  |  | — |  |  | 2,260 |  |  | — |  |  | 2,260 |
Income tax expense (benefit) | (7,985) |  |  | 8,131 |  |  | 9,464 |  |  | (384) |  |  | 9,226 |
Income from continuing operations | 25,441 |  |  | 37,302 |  |  | 32,627 |  |  | 1,274 |  |  | 96,644 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | (899) |  |  | (899) |
Net income | $ | 25,441 |  |  | $ | 37,302 |  |  | $ | 32,627 |  |  | $ | 375 |  |  | $ | 95,745 |
Six Months Ended June 30, 2024 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 206,916 |  |  | $ | 660,930 |  |  | $ | 64,883 |  |  | $ | 17 |  |  | $ | 932,746 |
Intersegment operating revenues | 60 |  |  | 76 |  |  | 39,325 |  |  | 42 |  |  | 39,503 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 353,192 |  |  | — |  |  | — |  |  | 353,192 |
Intersegment purchased natural gas sold | — |  |  | 39,071 |  |  | — |  |  | — |  |  | 39,071 |
Electric fuel and purchased power | 76,415 |  |  | — |  |  | — |  |  | — |  |  | 76,415 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 46,631 |  |  | 114,249 |  |  | 37,494 |  |  | 9,196 |  |  | 207,570 |
Intersegment operation and maintenance | 59 |  |  | 76 |  |  | 254 |  |  | 43 |  |  | 432 |
Depreciation and amortization | 32,836 |  |  | 51,026 |  |  | 14,436 |  |  | 1,158 |  |  | 99,456 |
Taxes, other than income | 9,616 |  |  | 43,950 |  |  | 6,102 |  |  | 215 |  |  | 59,883 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 4,047 |  |  | 13,521 |  |  | 3,498 |  |  | 1,207 |  |  | 22,273 |
Intersegment other income | — |  |  | — |  |  | 455 |  |  | 8,459 |  |  | 8,914 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 14,722 |  |  | 31,024 |  |  | 4,901 |  |  | 2,365 |  |  | 53,012 |
Intersegment interest expense | — |  |  | — |  |  | 2,852 |  |  | 6,062 |  |  | 8,914 |
Income tax expense (benefit) | (2,652) |  |  | 6,876 |  |  | 9,805 |  |  | (3,515) |  |  | 10,514 |
Income (loss) from continuing operations | 33,396 |  |  | 35,063 |  |  | 32,317 |  |  | (5,799) |  |  | 94,977 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | 66,357 |  |  | 66,357 |
Net income | $ | 33,396 |  |  | $ | 35,063 |  |  | $ | 32,317 |  |  | $ | 60,558 |  |  | $ | 161,334 |
Schedule of Reconciliation of Revenue from Segments to Consolidated | A reconciliation of reportable segment operating revenues to consolidated operating revenues is as follows:
| Three Months Ended | Six Months Ended
| June 30, | June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |
| (In thousands)
Operating revenues reconciliation: |  |  |  |
Total reportable segment operating revenues | $ | 361,215 |  | $ | 353,587 |  | $ | 1,069,656 |  | $ | 972,190 |
Other revenue | 179 |  | 22 |  | 358 |  | 59 |
Elimination of intersegment operating revenues | (10,208) |  | (9,138) |  | (43,995) |  | (39,503) |
Total consolidated operating revenues | $ | 351,186 |  | $ | 344,471 |  | $ | 1,026,019 |  | $ | 932,746 |

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