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LEASES -OPERATING LEASES (Details) - WECI - Hardin Solar III Energy Center - USD ($) $ in Millions	Sep. 30, 2025	Feb. 28, 2025
Leases
Ownership interest of generating facility acquired		90.00%
Operating lease obligation	$ 29.6
Operating lease right of use asset	$ 28.8
Weighted average discount rate - operating lease	6.32%
Term 1
Leases
Initial term	25 years
Renewal term	25 years
Term 2
Leases
Initial term	35 years
Renewal term	15 years

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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