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v3.25.2

Segment Information - Schedule of Segment Reporting Information by Segment (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  | 2 |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | $ 192,800 |  | $ 166,300 |  | $ 491,500 |  | $ 412,000 |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | 50,300 |  | 40,800 |  | 137,100 |  | 120,400 |  |
Other expense, net | 400 |  | 1,000 |  | 1,000 |  | 1,200 |  |
Interest | 17,800 |  | 16,800 |  | 35,900 |  | 33,800 |  |
Income Before Income Taxes | 32,900 |  | 25,000 |  | 102,200 |  | 87,800 |  |
Income taxes | 9,000 |  | 6,800 |  | 27,400 |  | 23,400 |  |
Net Income | 23,900 |  | 18,200 |  | 74,800 |  | 64,400 |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 3,737,800 |  |  |  | 3,737,800 |  |  |  | $ 3,577,000
Cost of Sales | 50,000 |  | 39,700 |  | 166,300 |  | 120,900 |  |
Utilities Operating Expense, Maintenance and Operations | 60,900 |  | 57,900 |  | 124,300 |  | 115,400 |  |
Depreciation and amortization | 21,900 |  | 17,900 |  | 44,400 |  | 34,900 |  |
Segment Reporting, Other Segment Item, Amount | 9,700 | [1] | 10,000 | [1] | 19,400 | [2] | 20,400 | [2] |
Regulated natural gas and electric costs | 34,100 |  | 27,400 |  | 105,600 |  | 77,300 |  |
Unregulated Energy Cost of Sales | 22,900 |  | 18,000 |  | 75,100 |  | 55,100 |  |
Other Cost of Sales | (7,000) | [3] | (5,700) | [3] | (14,400) | [4] | (11,500) | [4] |
Payments to Acquire Productive Assets | 99,900 |  | 88,900 |  | 212,800 |  | 159,500 |  |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 0 | [5] | 0 | [5] | 0 | [6] | 0 | [6] |
Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 192,800 |  | 166,300 |  | 491,500 |  | 412,000 |  |
Regulated Energy [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 151,800 |  | 130,700 |  | 351,400 |  | 299,100 |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | 51,800 |  | 40,500 |  | 112,300 |  | 98,600 |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 3,212,800 |  |  |  | 3,212,800 |  |  |  | 3,042,900
Utilities Operating Expense, Maintenance and Operations | 40,700 |  | 39,300 |  | 82,400 |  | 78,300 |  |
Depreciation and amortization | 16,800 |  | 14,700 |  | 34,400 |  | 27,200 |  |
Segment Reporting, Other Segment Item, Amount | 8,400 | [1] | 8,800 | [1] | 16,700 | [2] | 17,700 | [2] |
Payments to Acquire Productive Assets | 91,500 |  | 82,000 |  | 187,600 |  | 141,900 |  |
Regulated Energy [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 400 | [5] | 3,700 | [5] | 800 | [6] | 4,200 | [6] |
Regulated Energy [Member] | Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 151,400 |  | 127,000 |  | 350,600 |  | 294,900 |  |
Unregulated Energy [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 47,900 |  | 41,400 |  | 154,600 |  | 124,500 |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | (1,500) |  | 400 |  | 24,800 |  | 21,800 |  |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 466,700 |  |  |  | 466,700 |  |  |  | 486,400
Utilities Operating Expense, Maintenance and Operations | 20,200 |  | 18,600 |  | 42,000 |  | 37,200 |  |
Depreciation and amortization | 5,100 |  | 3,200 |  | 10,000 |  | 7,700 |  |
Segment Reporting, Other Segment Item, Amount | 1,200 | [1] | 1,200 | [1] | 2,700 | [2] | 2,700 | [2] |
Payments to Acquire Productive Assets | 7,700 |  | 6,500 |  | 22,500 |  | 16,300 |  |
Unregulated Energy [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 6,500 | [5] | 2,100 | [5] | 13,700 | [6] | 7,400 | [6] |
Unregulated Energy [Member] | Operating Revenues, Unaffiliated Customers [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | 41,400 |  | 39,300 |  | 140,900 |  | 117,100 |  |
Other [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | (6,900) | [3] | (5,800) | [3] | (14,500) | [4] | (11,600) | [4] |
Identifiable Assets |  |  |  |  |  |  |  |  |
Total identifiable assets | 58,300 |  |  |  | 58,300 |  |  |  | $ 47,700
Utilities Operating Expense, Maintenance and Operations | 0 | [3] | 0 | [3] | (100) | [4] | (100) | [4] |
Segment Reporting, Other Segment Item, Amount | 100 | [1],[3] | 0 | [1],[3] | 0 | [2],[4] | 0 | [2],[4] |
Payments to Acquire Productive Assets | 700 | [3] | 400 | [3] | 2,700 | [4] | 1,300 | [4] |
Other [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Revenues, Unaffiliated Customers |  |  |  |  |  |  |  |  |
Total operating revenues, unaffiliated customers | (6,900) | [3],[5] | (5,800) | [3],[5] | (14,500) | [4],[6] | (11,600) | [4],[6] |
Other and eliminations [Member] |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |
Total operating income | 0 | [3] | $ (100) | [3] | 0 | [4] | 0 | [4] |
Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |
Net Income | $ 23,900 |  |  |  | $ 74,800 |  | $ 64,400 |  |
[1] | (3) Other segment items for each reportable segment include: Regulated - Other taxes and transaction and transition costs related to the integration of FCG; Unregulated - Other taxes
[2] | 3) Other segment items for each reportable segment include: Regulated - Other taxes and transaction and transition costs related to the integration of FCG; Unregulated - Other taxes.
[3] | (1) Other revenues and other operating income (loss) amounts are attributable to eliminations and unregulated subsidiaries that own real estate leased to the Company.
[4] | (1) Other revenues and other operating income (loss) amounts are attributable to eliminations and unregulated subsidiaries that own real estate leased to the Company.
[5] | (2) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.
[6] | (2) All significant intersegment revenues are billed at market rates and have been eliminated from consolidated revenues.

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