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Business segment data (Tables) | 9 Months Ended
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Sep. 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 September 30, 2025 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 117,662 |  |  | $ | 144,215 |  |  | $ | 53,159 |  |  | $ | — |  |  | $ | 315,036 |
Intersegment operating revenues | 138 |  |  | 92 |  |  | 4,269 |  |  | 182 |  |  | 4,681 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 58,514 |  |  | — |  |  | — |  |  | 58,514 |
Intersegment purchased natural gas sold | — |  |  | 4,226 |  |  | — |  |  | — |  |  | 4,226 |
Electric fuel and purchased power | 41,098 |  |  | — |  |  | — |  |  | — |  |  | 41,098 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 25,957 |  |  | 56,531 |  |  | 21,016 |  |  | (1,742) |  |  | 101,762 |
Intersegment operation and maintenance | 138 |  |  | 92 |  |  | 43 |  |  | 182 |  |  | 455 |
Depreciation and amortization | 17,479 |  |  | 26,558 |  |  | 8,009 |  |  | — |  |  | 52,046 |
Taxes, other than income | 4,713 |  |  | 13,375 |  |  | 3,688 |  |  | — |  |  | 21,776 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 2,027 |  |  | 3,850 |  |  | 880 |  |  | 541 |  |  | 7,298 |
Intersegment other income | — |  |  | — |  |  | 122 |  |  | 1,565 |  |  | 1,687 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 7,639 |  |  | 14,686 |  |  | 2,447 |  |  | 1,645 |  |  | 26,417 |
Intersegment interest expense | — |  |  | — |  |  | 1,687 |  |  | — |  |  | 1,687 |
Income tax expense (benefit) | 1,339 |  |  | (7,612) |  |  | 4,782 |  |  | 3,862 |  |  | 2,371 |
Income (loss) from continuing operations | 21,464 |  |  | (18,213) |  |  | 16,758 |  |  | (1,659) |  |  | 18,350 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | (39) |  |  | (39) |
Net income (loss) | $ | 21,464 |  |  | $ | (18,213) |  |  | $ | 16,758 |  |  | $ | (1,698) |  |  | $ | 18,311 |
Three Months Ended September 30, 2024 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 108,468 |  |  | $ | 133,590 |  |  | $ | 47,635 |  |  | $ | 1 |  |  | $ | 289,694 |
Intersegment operating revenues | 12 |  |  | 31 |  |  | 3,924 |  |  | 21 |  |  | 3,988 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 53,377 |  |  | — |  |  | — |  |  | 53,377 |
Intersegment purchased natural gas sold | — |  |  | 3,888 |  |  | — |  |  | — |  |  | 3,888 |
Electric fuel and purchased power | 32,576 |  |  | — |  |  | — |  |  | — |  |  | 32,576 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 23,359 |  |  | 54,785 |  |  | 18,969 |  |  | 4,098 |  |  | 101,211 |
Intersegment operation and maintenance | 12 |  |  | 31 |  |  | 36 |  |  | 21 |  |  | 100 |
Depreciation and amortization | 16,848 |  |  | 25,055 |  |  | 7,369 |  |  | 563 |  |  | 49,835 |
Taxes, other than income | 3,606 |  |  | 11,180 |  |  | 3,006 |  |  | 57 |  |  | 17,849 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 1,403 |  |  | 5,985 |  |  | 1,117 |  |  | 465 |  |  | 8,970 |
Intersegment other income | — |  |  | — |  |  | 237 |  |  | 3,794 |  |  | 4,031 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 7,646 |  |  | 15,901 |  |  | 2,564 |  |  | 1,226 |  |  | 27,337 |
Intersegment interest expense | — |  |  | — |  |  | 1,097 |  |  | 2,934 |  |  | 4,031 |
Income tax expense (benefit) | 1,544 |  |  | (7,130) |  |  | 4,688 |  |  | 1,774 |  |  | 876 |
Income (loss) from continuing operations | 24,292 |  |  | (17,481) |  |  | 15,184 |  |  | (6,392) |  |  | 15,603 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | 49,012 |  |  | 49,012 |
Net income (loss) | $ | 24,292 |  |  | $ | (17,481) |  |  | $ | 15,184 |  |  | $ | 42,620 |  |  | $ | 64,615 |
Nine Months Ended September 30, 2025 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 327,808 |  |  | $ | 890,257 |  |  | $ | 122,990 |  |  | $ | — |  |  | $ | 1,341,055 |
Intersegment operating revenues | 457 |  |  | 278 |  |  | 47,401 |  |  | 540 |  |  | 48,676 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 471,728 |  |  | — |  |  | — |  |  | 471,728 |
Intersegment purchased natural gas sold | — |  |  | 47,300 |  |  | — |  |  | — |  |  | 47,300 |
Electric fuel and purchased power | 119,737 |  |  | — |  |  | — |  |  | — |  |  | 119,737 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 84,186 |  |  | 180,471 |  |  | 62,608 |  |  | (1,569) |  |  | 325,696 |
Intersegment operation and maintenance | 457 |  |  | 278 |  |  | 101 |  |  | 540 |  |  | 1,376 |
Depreciation and amortization | 52,055 |  |  | 79,151 |  |  | 23,954 |  |  | — |  |  | 155,160 |
Taxes, other than income | 14,176 |  |  | 60,938 |  |  | 10,585 |  |  | — |  |  | 85,699 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 5,745 |  |  | 12,246 |  |  | 2,804 |  |  | 1,445 |  |  | 22,240 |
Intersegment other income | — |  |  | — |  |  | 334 |  |  | 3,613 |  |  | 3,947 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 23,140 |  |  | 43,307 |  |  | 8,703 |  |  | 3,534 |  |  | 78,684 |
Intersegment interest expense | — |  |  | — |  |  | 3,947 |  |  | — |  |  | 3,947 |
Income tax expense (benefit) | (6,646) |  |  | 519 |  |  | 14,246 |  |  | 3,478 |  |  | 11,597 |
Income from continuing operations | 46,905 |  |  | 19,089 |  |  | 49,385 |  |  | (385) |  |  | 114,994 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | (938) |  |  | (938) |
Net income | $ | 46,905 |  |  | $ | 19,089 |  |  | $ | 49,385 |  |  | $ | (1,323) |  |  | $ | 114,056 |
Nine Months Ended September 30, 2024 | Electric |  | Natural gas distribution |  | Pipeline |  | Other |  | Consolidated
| (In thousands)
Operating revenues: |  |  |  |  |  |  |  |  |
External operating revenues | $ | 315,385 |  |  | $ | 794,519 |  |  | $ | 112,518 |  |  | $ | 18 |  |  | $ | 1,222,440 |
Intersegment operating revenues | 71 |  |  | 108 |  |  | 43,249 |  |  | 64 |  |  | 43,492 |
Purchased natural gas sold: |  |  |  |  |  |  |  |  |
External purchased natural gas sold | — |  |  | 406,569 |  |  | — |  |  | — |  |  | 406,569 |
Intersegment purchased natural gas sold | — |  |  | 42,958 |  |  | — |  |  | — |  |  | 42,958 |
Electric fuel and purchased power | 108,991 |  |  | — |  |  | — |  |  | — |  |  | 108,991 |
Operation and maintenance: |  |  |  |  |  |  |  |  |
External operation and maintenance | 69,989 |  |  | 169,034 |  |  | 56,461 |  |  | 13,296 |  |  | 308,780 |
Intersegment operation and maintenance | 71 |  |  | 108 |  |  | 291 |  |  | 64 |  |  | 534 |
Depreciation and amortization | 49,685 |  |  | 76,081 |  |  | 21,806 |  |  | 1,720 |  |  | 149,292 |
Taxes, other than income | 13,222 |  |  | 55,130 |  |  | 9,108 |  |  | 271 |  |  | 77,731 |
Other income: |  |  |  |  |  |  |  |  |
External other income | 5,449 |  |  | 19,506 |  |  | 4,616 |  |  | 1,671 |  |  | 31,242 |
Intersegment other income | — |  |  | — |  |  | 692 |  |  | 12,253 |  |  | 12,945 |
Interest expense: |  |  |  |  |  |  |  |  |
External interest expense | 22,367 |  |  | 46,925 |  |  | 7,466 |  |  | 3,591 |  |  | 80,349 |
Intersegment interest expense | — |  |  | — |  |  | 3,949 |  |  | 8,996 |  |  | 12,945 |
Income tax expense (benefit) | (1,109) |  |  | (253) |  |  | 14,493 |  |  | (1,741) |  |  | 11,390 |
Income (loss) from continuing operations | 57,689 |  |  | 17,581 |  |  | 47,501 |  |  | (12,191) |  |  | 110,580 |
Discontinued operations, net of tax | — |  |  | — |  |  | — |  |  | 115,370 |  |  | 115,370 |
Net income | $ | 57,689 |  |  | $ | 17,581 |  |  | $ | 47,501 |  |  | $ | 103,179 |  |  | $ | 225,950 |
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 | Nine Months Ended
| September 30, | September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024 |
| (In thousands)
Operating revenues reconciliation: |  |  |  |
Total reportable segment operating revenues | $ | 319,535 |  | $ | 293,660 |  | $ | 1,389,191 |  | $ | 1,265,850 |
Other revenue | 182 |  | 22 |  | 540 |  | 82 |
Elimination of intersegment operating revenues | (4,681) |  | (3,988) |  | (48,676) |  | (43,492) |
Total consolidated operating revenues | $ | 315,036 |  | $ | 289,694 |  | $ | 1,341,055 |  | $ | 1,222,440 |

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