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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. |
Schedule of Asset Retirement Obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ |  | 2024 |  | 2023
Balance, beginning of year | ​ | $ | 16,688 | ​ | $ | 20,834
Accretion | ​ |  | 1,628 | ​ |  | 1,804
Change in estimate | ​ |  | — | ​ |  | (2,566)
Payments | ​ |  | (1,407) | ​ |  | (3,384)
Balance, end of year | ​ |  | 16,909 | ​ |  | 16,688
Less current portion | ​ |  | (1,952) | ​ |  | (2,150)
Long-term balance, end of year | ​ | $ | 14,957 | ​ | $ | 14,538
Schedule of committed to supply the long-term delivered energy and capacity | As of December 31, 2024, we are committed to supply the following long-term delivered energy and capacity related to Hoosier and third-party customers:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2025 | ​ | 2026 | ​ | 2027 | ​ | 2028 | ​ | 2029
Annual plant energy generation (in MWh) (in millions) |  | 6.0 |  | 6.0 |  | 6.0 |  | 6.0 |  | 6.0
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Hoosier PPA delivered energy (in MWh) (in millions) | ​ | 1.7 | ​ | 1.6 | ​ | 1.3 | ​ | 0.4 | ​ | -
Percentage of annual plant energy generation | ​ | 28% | ​ | 27% | ​ | 22% | ​ | 7% | ​ | 0%
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other customers delivered energy (in MWh) (in millions) | ​ | 0.6 | ​ | 1.8 | ​ | 0.5 | ​ | 0.7 | ​ | 0.3
Percentage of annual plant energy generation | ​ | 10% | ​ | 30% | ​ | 8% | ​ | 12% | ​ | 5%
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Plant capacity (in MW) | ​ | 775 | ​ | 800 | ​ | 800 | ​ | 800 | ​ | 800
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Hoosier PPA Capacity (in MW) | ​ | 97 | ​ | 105 | ​ | 110 | ​ | 46 | ​ | -
Percentage of annual plant capacity | ​ | 13% | ​ | 13% | ​ | 14% | ​ | 6% | ​ | 0%
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other customers capacity (in MW) | ​ | 68 | ​ | 89 | ​ | 118 | ​ | 120 | ​ | 15
Percentage of annual plant capacity | ​ | 9% | ​ | 11% | ​ | 15% | ​ | 15% | ​ | 2%

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- Definition Tabular disclosure of arrangements in which the entity has committed resources to supply goods or services to a customer. May include identification of the goods or services to be furnished, identity of the purchasing party, pricing, effects on pricing for failing to deliver the [minimum] quantities required to be furnished, cancellation rights, and termination provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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