Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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DERIVATIVE ASSETS (Details) $ in Millions	3 Months Ended		9 Months Ended
DERIVATIVE ASSETS (Details) $ in Millions	Sep. 30, 2025 USD ($) $ / Unit	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) $ / Unit	Sep. 30, 2024 USD ($)
Luminant Power Agreement
Derivative Instruments, Gain (Loss) [Line Items]
Termination notice period			6 months
Capped Call Transactions
Derivative Instruments, Gain (Loss) [Line Items]
Cap price (in dollars per unit) \| $ / Unit	23.32		23.32
Purchase of capped calls			$ 82.7
Luminant Power Agreement
Derivative Instruments, Gain (Loss) [Line Items]
Power sales	$ 2.3	$ 1.4	$ 4.7	$ 3.7
Luminant Power Agreement \| Luminant ET Services Company LLC
Derivative Instruments, Gain (Loss) [Line Items]
Term of power agreement			5 years