| Segment Reporting [Table Text Block] |
Financial data for the reportable segments are as follows (in thousands): | | | | | | | | | | | | | | | | | | | Three Months Ended | | | | | | | June 30, 2026 | Electric | | Gas | | Total | | Operating revenues | $ | 324,254 | | | $ | 68,345 | | | $ | 392,599 | | | Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below) | 72,836 | | | 16,987 | | | 89,823 | | | Operating, general, and administrative | 91,739 | | | 25,551 | | | 117,290 | | | Property and other taxes | 39,056 | | | 11,044 | | | 50,100 | | | Depreciation and depletion | 55,562 | | | 11,416 | | | 66,978 | | | Interest expense, net | (30,589) | | | (8,086) | | | (38,675) | | | Other income, net | 2,941 | | | 1,167 | | | 4,108 | | | Income tax (expense) benefit | (5,451) | | | 304 | | | (5,147) | | | Segment net income (loss) | $ | 31,962 | | | $ | (3,268) | | | $ | 28,694 | | | Reconciliation to consolidated net income | | | | | | Other, net(1) | | | | | (3,700) | | | Consolidated net income | | | | | $ | 24,994 | |
| | | | | | | | | | | | | | | | | | | Three Months Ended | | | | | | | June 30, 2025 | Electric | | Gas | | Total | | Operating revenues | $ | 279,468 | | | $ | 63,245 | | | $ | 342,713 | | | Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below) | 59,603 | | | 15,668 | | | 75,271 | | | Operating, general, and administrative | 73,615 | | | 22,773 | | | 96,388 | | | Property and other taxes | 37,318 | | | 10,850 | | | 48,168 | | | Depreciation and depletion | 52,387 | | | 9,992 | | | 62,379 | | | Interest expense, net | (27,562) | | | (7,297) | | | (34,859) | | | Other income, net | 121 | | | 456 | | | 577 | | | Income tax (expense) benefit | (4,230) | | | 201 | | | (4,029) | | | Segment net income (loss) | $ | 24,874 | | | $ | (2,678) | | | $ | 22,196 | | | Reconciliation to consolidated net income | | | | | | Other, net(1) | | | | | (968) | | | Consolidated net income | | | | | $ | 21,228 | |
| | | | | | | | | | | | | | | | | | | Six Months Ended | | | | | | | June 30, 2026 | Electric | | Gas | | Total | | Operating revenues | $ | 686,308 | | | $ | 203,861 | | | $ | 890,169 | | | Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below) | 163,111 | | | 72,277 | | | 235,388 | | | Operating, general, and administrative | 181,340 | | | 52,682 | | | 234,022 | | | Property and other taxes | 78,267 | | | 22,196 | | | 100,463 | | | Depreciation and depletion | 111,031 | | | 22,778 | | | 133,809 | | | Interest expense, net | (60,774) | | | (15,957) | | | (76,731) | | | Other income, net | 4,486 | | | 1,791 | | | 6,277 | | | Income tax expense | (16,934) | | | (2,831) | | | (19,765) | | | Segment net income | $ | 79,337 | | | $ | 16,931 | | | $ | 96,268 | | | Reconciliation to consolidated net income | | | | | | Other, net(1) | | | | | (7,818) | | | Consolidated net income | | | | | $ | 88,450 | | | | | | | |
| | | | | | | | | | | | | | | | | | | Six Months Ended | | | | | | | June 30, 2025 | Electric | | Gas | | Total | | Operating revenues | $ | 614,951 | | | $ | 194,392 | | | $ | 809,343 | | | Fuel, purchased supply and direct transmission expense (exclusive of depreciation and depletion shown separately below) | 152,355 | | | 61,113 | | | 213,468 | | | Operating, general, and administrative | 146,094 | | | 47,943 | | | 194,037 | | | Property and other taxes | 70,604 | | | 20,645 | | | 91,249 | | | Depreciation and depletion | 104,875 | | | 19,904 | | | 124,779 | | | Interest expense, net | (55,318) | | | (14,331) | | | (69,649) | | | Other income, net | 2,611 | | | 1,547 | | | 4,158 | | | Income tax expense | (14,102) | | | (4,226) | | | (18,328) | | | Segment net income | $ | 74,214 | | | $ | 27,777 | | | $ | 101,991 | | | Reconciliation to consolidated net income | | | | | | Other, net(1) | | | | | (3,823) | | | Consolidated net income | | | | | $ | 98,168 | | | | | | | |
(1) Consists of unallocated corporate costs, including merger-related costs, and certain limited unregulated activity within the energy industry.
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