Select Balance Sheet Information (Tables)
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6 Months Ended |
Jun. 30, 2026 |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] |
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| Schedule of Restricted and Unrestricted Cash |
The following table reconciles the amounts presented for cash, both unrestricted and restricted, in the consolidated balance sheets to the amounts presented in the consolidated statements of cash flows as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | (in thousands) | June 30, 2026 | | December 31, 2025 | | | | | | Cash and Cash Equivalents | $ | 278,383 | | | $ | 386,193 | | Restricted Cash(1) | 73,500 | | | — | | | Total Cash, Cash Equivalents and Restricted Cash | $ | 351,883 | | | $ | 386,193 | | (1) Represents the amounts held in the escrow accounts as part of the pending legal settlements of certain class-action lawsuits. These amounts will remain restricted until such time the related settlement agreements receive final court approval and the funds are disbursed to the class members or settlement agreements are terminated, at which point the funds would be returned to the Company. See Note 10, Commitments and Contingencies, for additional information. |
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| Schedule of Restricted and Unrestricted Cash |
The following table reconciles the amounts presented for cash, both unrestricted and restricted, in the consolidated balance sheets to the amounts presented in the consolidated statements of cash flows as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | (in thousands) | June 30, 2026 | | December 31, 2025 | | | | | | Cash and Cash Equivalents | $ | 278,383 | | | $ | 386,193 | | Restricted Cash(1) | 73,500 | | | — | | | Total Cash, Cash Equivalents and Restricted Cash | $ | 351,883 | | | $ | 386,193 | | (1) Represents the amounts held in the escrow accounts as part of the pending legal settlements of certain class-action lawsuits. These amounts will remain restricted until such time the related settlement agreements receive final court approval and the funds are disbursed to the class members or settlement agreements are terminated, at which point the funds would be returned to the Company. See Note 10, Commitments and Contingencies, for additional information. |
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| Schedule of Receivables |
Receivables as of June 30, 2026 and December 31, 2025 are as follows: | | | | | | | | | | | | | (in thousands) | June 30, 2026 | | December 31, 2025 | | | | | | Receivables | | | | | Trade | $ | 169,019 | | | $ | 110,180 | | | Other | 10,653 | | | 12,094 | | | Unbilled Receivables | 21,270 | | | 24,868 | | | Total Receivables | 200,942 | | | 147,142 | | | Less: Allowance for Credit Losses | 1,908 | | | 1,646 | | | Receivables, net of allowance for credit losses | $ | 199,034 | | | $ | 145,496 | |
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| Schedule of Activity in Allowance for Credit Losses |
The following is a summary of activity in the allowance for credit losses for the six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | (in thousands) | 2026 | | 2025 | | | | | | Beginning Balance, January 1 | $ | 1,646 | | | $ | 1,920 | | | Additions Charged to Expense | 729 | | | 880 | | | Reductions for Amounts Written Off, Net of Recoveries | (467) | | | (443) | | Ending Balance, June 30 | $ | 1,908 | | | $ | 2,357 | |
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| Schedule of Inventories |
Inventories consist of the following as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | (in thousands) | June 30, 2026 | | December 31, 2025 | | | | | Raw Material, Fuel and Supplies | $ | 101,547 | | | $ | 90,720 | | | Work in Process | 26,224 | | | 25,381 | | | Finished Goods | 42,209 | | | 42,497 | | | Total Inventories | $ | 169,980 | | | $ | 158,598 | |
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| Schedule of Investments |
The following is a summary of our investments as of June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | (in thousands) | June 30, 2026 | | December 31, 2025 | | | | | Short-term Investments | | | | Government Debt Securities | $ | 54,921 | | | $ | 53,915 | | Corporate Debt Securities | 399 | | | 396 | | Total Short-term Investments | 55,320 | | | 54,311 | | Long-term Investments | | | | | Corporate-Owned Life Insurance Policies | 49,872 | | | 49,258 | | Government Debt Securities | 8,687 | | | 9,221 | | Corporate Debt Securities | 931 | | | 924 | | | Mutual Funds | 20,542 | | | 16,727 | | | Money Market Funds | 2,607 | | | 2,666 | | | Other Investments | 27 | | | 27 | | Total Long-term Investments | 82,666 | | | 78,823 | | | Total Investments | $ | 137,986 | | | $ | 133,134 | |
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| 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 June 30, 2026 and December 31, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | | | | | | | | | (in thousands) | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized (Losses) | | Fair Value | | | | | | | | | | Government Debt Securities | $ | 63,519 | | | $ | 133 | | | $ | (44) | | | $ | 63,608 | | | Corporate Debt Securities | 1,334 | | | 1 | | | (5) | | | 1,330 | | Total Debt Securities | $ | 64,853 | | | $ | 134 | | | $ | (49) | | | $ | 64,938 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | | | | | | | | | (in thousands) | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized (Losses) | | Fair Value | | | | | | | | | | Government Debt Securities | $ | 62,617 | | | $ | 527 | | | $ | (8) | | | $ | 63,136 | | | Corporate Debt Securities | 1,309 | | | 12 | | | (1) | | | 1,320 | | Total Debt Securities | $ | 63,926 | | | $ | 539 | | | $ | (9) | | | $ | 64,456 | |
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| 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 June 30, 2026: | | | | | | | (in thousands) | June 30, 2026 | | | Due in one year or less | $ | 55,320 | | Due in one to five years | 9,091 | | Due in five to ten years | 527 | | Total Debt Securities | $ | 64,938 | |
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| Schedule of Property, Plant and Equipment |
Major classes of property, plant and equipment as of June 30, 2026 and December 31, 2025 include: | | | | | | | | | | | | | (in thousands) | June 30, 2026 | | December 31, 2025 | | | | | | Electric Plant | | | | | Electric Plant in Service | $ | 3,461,933 | | | $ | 3,370,677 | | | Construction Work in Progress | 400,844 | | | 233,978 | | | Total Gross Electric Plant | 3,862,777 | | | 3,604,655 | | Less Accumulated Depreciation | 897,871 | | | 899,401 | | | Net Electric Plant | 2,964,906 | | | 2,705,254 | | | Nonelectric Property, Plant and Equipment | | | | Nonelectric Property, Plant and Equipment | 412,845 | | | 404,922 | | | Construction Work in Progress | 14,989 | | | 12,389 | | | Total Gross Nonelectric Property, Plant and Equipment | 427,834 | | | 417,311 | | Less Accumulated Depreciation | 254,310 | | | 245,880 | | | Net Nonelectric Property, Plant and Equipment | 173,524 | | | 171,431 | | Total Net Property, Plant and Equipment | $ | 3,138,430 | | | $ | 2,876,685 | |
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