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Select Balance Sheet Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Receivables | Receivables as of September 30, 2025 and December 31, 2024 are as follows:
(in thousands) | September 30, 2025 |  | December 31, 2024
Receivables |  |  |
Trade | $ | 140,890 |  |  | $ | 112,169 |
Other | 10,593 |  |  | 13,799 |
Unbilled Receivables | 16,968 |  |  | 21,916 |
Total Receivables | 168,451 |  |  | 147,884 |
Less: Allowance for Credit Losses | 1,757 |  |  | 1,920 |
Receivables, net of allowance for credit losses | $ | 166,694 |  |  | $ | 145,964 |
Schedule of Activity in Allowance for Credit Losses | The following is a summary of activity in the allowance for credit losses for the nine months ended September 30, 2025 and 2024:
(in thousands) | 2025 |  | 2024
Beginning Balance, January 1 | $ | 1,920 |  |  | $ | 2,522 |
Additions Charged to Expense | 1,134 |  |  | 904 |
Reductions for Amounts Written Off, Net of Recoveries | (1,297) |  |  | (1,476) |
Ending Balance, September 30 | $ | 1,757 |  |  | $ | 1,950 |
Schedule of Inventories | Inventories consist of the following as of September 30, 2025 and December 31, 2024:
(in thousands) | September 30, 2025 |  | December 31, 2024
Finished Goods | $ | 39,146 |  |  | $ | 43,345 |
Work in Process | 24,174 |  |  | 22,637 |
Raw Material, Fuel and Supplies | 92,445 |  |  | 82,903 |
Total Inventories | $ | 155,765 |  |  | $ | 148,885 |
Schedule of Investments | The following is a summary of our investments as of September 30, 2025 and December 31, 2024:
(in thousands) | September 30, 2025 |  | December 31, 2024
Short-term Investments |  |  |
Government Debt Securities | $ | 53,482 |  |  | $ | 753 |
Corporate Debt Securities | 395 |  |  | — |
Total Short-term Investments | 53,877 |  |  | 753 |
Long-term Investments |  |  |
Corporate-Owned Life Insurance Policies | 50,027 |  |  | 47,895 |
Government Debt Securities | 9,022 |  |  | 60,378 |
Corporate Debt Securities | 895 |  |  | 1,628 |
Mutual Funds | 16,454 |  |  | 10,653 |
Money Market Funds | 1,237 |  |  | 596 |
Other Investments | 27 |  |  | 27 |
Total Long-term Investments | 77,662 |  |  | 121,177 |
Total Investments | $ | 131,539 |  |  | $ | 121,930 |
Schedule of Amortized Costs and Fair Value of Debt Securities, Available-for-Sale | The following table summarizes the amortized cost and fair value of available-for-sale debt securities and the corresponding amounts of gross unrealized gains and losses as of September 30, 2025 and December 31, 2024:
| September 30, 2025
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Government Debt Securities | $ | 61,967 |  |  | $ | 586 |  |  | $ | (49) |  |  | $ | 62,504 |
Corporate Debt Securities | 1,280 |  |  | 12 |  |  | (2) |  |  | 1,290 |
Total | $ | 63,247 |  |  | $ | 598 |  |  | $ | (51) |  |  | $ | 63,794 |
| December 31, 2024
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized (Losses) |  | Fair Value
Government Debt Securities | $ | 60,891 |  |  | $ | 424 |  |  | $ | (184) |  |  | $ | 61,131 |
Corporate Debt Securities | 1,629 |  |  | 9 |  |  | (10) |  |  | 1,628 |
Total | $ | 62,520 |  |  | $ | 433 |  |  | $ | (194) |  |  | $ | 62,759 |
Schedule of Investments Classified by Contractual Maturity Date | The following table summarizes the fair value of available-for-sale debt securities by contractual maturity date as of September 30, 2025:
(in thousands) | September 30, 2025
Due in one year or less | $ | 53,877 |
Due in one to five years | 9,917 |
Total | $ | 63,794 |
Schedule of Property, Plant and Equipment | Major classes of property, plant and equipment as of September 30, 2025 and December 31, 2024 include:
(in thousands) | September 30, 2025 |  | December 31, 2024
Electric Plant |  |  |
Electric Plant in Service | $ | 3,234,585 |  |  | $ | 3,180,943 |
Construction Work in Progress | 334,457 |  |  | 231,890 |
Total Gross Electric Plant | 3,569,042 |  |  | 3,412,833 |
Less Accumulated Depreciation and Amortization | 921,038 |  |  | 899,049 |
Net Electric Plant | 2,648,004 |  |  | 2,513,784 |
Nonelectric Property, Plant and Equipment |  |  |
Nonelectric Property, Plant and Equipment in Service | 401,193 |  |  | 362,565 |
Construction Work in Progress | 12,223 |  |  | 40,536 |
Total Gross Nonelectric Property, Plant and Equipment | 413,416 |  |  | 403,101 |
Less Accumulated Depreciation and Amortization | 240,731 |  |  | 224,425 |
Net Nonelectric Property, Plant and Equipment | 172,685 |  |  | 178,676 |
Net Property, Plant and Equipment | $ | 2,820,689 |  |  | $ | 2,692,460 |

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