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SHORT-TERM DEBT AND LINES OF CREDIT (Tables)
 6 Months Ended
Jun. 30, 2025
Short-Term Debt [Abstract]  
Schedule of short-term borrowings and weighted-average interest rates
The following table shows our short-term borrowings and their corresponding weighted-average interest rates:
(in millions, except percentages)June 30, 2025December 31, 2024
Commercial paper
Amount outstanding$806.4 $1,114.4 
Weighted-average interest rate on amounts outstanding 4.53 %4.63 %
Operating expense loans
Amount outstanding (1)
$3.9 $2.2 

(1)Coyote Ridge Wind, LLC, Tatanka Ridge, Jayhawk, and Samson I have entered into operating expense loans. In accordance with their limited liability company operating agreements, they received loans from the holders of their noncontrolling interests in proportion to their ownership interests.
Schedule of credit agreements and remaining available capacity
The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including remaining available capacity under these facilities:
(in millions)MaturityJune 30, 2025
WEC Energy GroupSeptember 2026$1,500.0 
WEC Energy GroupOctober 2025200.0 
WESeptember 2026500.0 
WPSSeptember 2026400.0 
WGSeptember 2026350.0 
PGLSeptember 2026350.0 
Total short-term credit capacity$3,300.0 
Less: 
Letters of credit issued inside credit facilities$2.3 
Commercial paper outstanding806.4 
Available capacity under existing agreements$2,491.3