ACQUISITIONS - WHITETAIL (Details) - Whitetail Wind Energy Generating Facility $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($) MW
WE
Asset Acquisition [Line Items]
Capacity of generation unit \| MW	67.2
Joint plant ownership percentage	80.00%
Acquisition purchase price, expected	$ 178.0
WPS
Asset Acquisition [Line Items]
Joint plant ownership percentage	10.00%
Acquisition purchase price, expected	$ 22.0

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Purchase price of expected asset acquisition prior to consideration being transferred. Excludes business acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 50
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-Section 15
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- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The capacity, in megawatts, of a generation unit.

+ References

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