v3.26.3
Power Supply Agreements (Tables)
9 Months Ended
Sep. 30, 2026
Derivative Instruments, Gain (Loss) [Line Items]  
Schedule of realized and unrealized gains and losses recognized by the company

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Three Months Ended

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Nine Months Ended

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September 30, 

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September 30, 

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2026

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2025

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2026

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2025

Realized gain (loss)

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$

(0.2)

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$

(0.9)

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$

0.8

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$

(1.0)

Unrealized gain (loss)

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$

(0.4)

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$

-

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$

(1.6)

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$

(0.2)

Schedule of unobservable inputs used in the valuation of derivative assets

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Valuation Date

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Significant Unobservable Input

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Range

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Average

September 30, 2026

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Forward prices (per MWh)

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$

30.46

-

$

84.54

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$

44.59

December 31, 2025

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Forward prices (per MWh)

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$

36.09

-

$

106.51

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$

55.70

Rockdale PPA  
Derivative Instruments, Gain (Loss) [Line Items]  
Schedule of changes in estimated fair value of derivative asset

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Derivative asset balance as of January 1, 2025

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$

148,673

Change in fair value:

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Change due to future price curve

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22,023

Change due to passage of time and settlements

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(12,884)

Total change in fair value

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9,139

Derivative asset balance as of September 30, 2025

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$

157,812

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Derivative asset balance as of January 1, 2026

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$

147,026

Change in fair value:

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Change due to future price curve

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​

(68,594)

Change due to passage of time and settlements

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​

(15,944)

Total change in fair value

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​

(84,538)

Derivative asset balance as of September 30, 2026

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$

62,488

Corsicana PPA  
Derivative Instruments, Gain (Loss) [Line Items]  
Schedule of changes in estimated fair value of derivative asset

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Derivative asset balance as of January 1, 2025

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$

822

Change in fair value:

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Change due to future price curve

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761

Change due to passage of time and settlements

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39

Total change in fair value

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​

800

Derivative asset balance as of September 30, 2025

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$

1,622

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Derivative asset balance as of January 1, 2026

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$

1,022

Change in fair value:

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Change due to future price curve

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(2,182)

Change due to passage of time and settlements

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183

Total change in fair value

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​

(1,999)

Derivative liability balance as of September 30, 2026

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$

(977)