REGULATORY ENVIRONMENT - 2025 AND 2026 RATES (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions	1 Months Ended
	Dec. 31, 2024 USD ($)
2025 and 2026 Rates
Public Utilities, General Disclosures
Approved return on equity (as a percent)	9.80%
Approved common equity component average (as a percent)	53.00%
Percentage of first 15 basis points of additional earnings retained by the utility	100.00%
Return on equity in excess of authorized amount (as a percent)	0.15%
Percentage of additional earnings between 15 and 75 basis points refunded to customers	50.00%
Return on equity in excess of first 15 basis points above authorized amount (as a percent)	0.60%
Percentage of earnings in excess of 75 basis points refunded to customers	100.00%
2025 Rates \| Electric
Public Utilities, General Disclosures
Approved rate increase	$ 55.1
Approved rate increase (as a percent)	4.50%
2025 Rates \| Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 14.9
Approved rate increase (as a percent)	3.80%
2026 Rates \| Electric
Public Utilities, General Disclosures
Approved rate increase	$ 30.0
Approved rate increase (as a percent)	2.30%
2026 Rates \| Natural gas
Public Utilities, General Disclosures
Approved rate increase	$ 13.5
Approved rate increase (as a percent)	3.10%

WISCONSIN PUBLIC SERVICE CORP 10-K