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REVENUE - Remaining performance obligations (Details) - Operating Segment $ in Thousands | Jun. 30, 2025 USD ($)
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 991,270
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 197,330
Unsatisfied or partially unsatisfied performance obligation, period | 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 361,590
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 290,530
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 124,580
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 17,240
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Delivered energy |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 436,530
Electric Operations | Delivered energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 95,510
Unsatisfied or partially unsatisfied performance obligation, period | 6 months
Electric Operations | Delivered energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 172,220
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Delivered energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 97,280
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Delivered energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 57,750
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Delivered energy | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 13,770
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Energy Capacity |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 183,200
Electric Operations | Energy Capacity | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 29,460
Unsatisfied or partially unsatisfied performance obligation, period | 6 months
Electric Operations | Energy Capacity | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 61,540
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Energy Capacity | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 51,400
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Energy Capacity | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 37,330
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Electric Operations | Energy Capacity | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 3,470
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Coal Operations |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 371,540
Coal Operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 72,360
Unsatisfied or partially unsatisfied performance obligation, period | 6 months
Coal Operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 127,830
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Coal Operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 141,850
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Coal Operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Revenue expected to be recognized | $ 29,500
Unsatisfied or partially unsatisfied performance obligation, period | 1 year
Coal Operations | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |
Unsatisfied or partially unsatisfied performance obligation, period | 1 year

X
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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- Definition Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(1) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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