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Short-Term Debt and Lines of Credit (Tables)
 12 Months Ended
Dec. 31, 2023
Short-Term Debt [Abstract]  
Short-term debt balances and their corresponding weighted-average interest rates
The following table shows our short-term borrowings and their corresponding weighted-average interest rates as of December 31:
(in millions, except percentages)20232022
Commercial paper
Amount outstanding at December 31$2,017.2 $1,643.5 
Average interest rate on amounts outstanding at December 315.49 %4.64 %
Operating expense loans
Amount outstanding at December 31 (1)
$3.7 $3.6 

(1)    Coyote Ridge, Tatanka Ridge, and Jayhawk 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 revolving credit facilities
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 as of December 31:
(in millions)Maturity2023
Revolving credit facility (WEC Energy Group) (1)
September 2026$1,500.0 
Revolving credit facility (WEC Energy Group)October 2024200.0 
Revolving credit facility (WE) (1)
September 2026500.0 
Revolving credit facility (WPS) (1)
September 2026400.0 
Revolving credit facility (WG) (1)
September 2026350.0 
Revolving credit facility (PGL) (1)
September 2026350.0 
Total short-term credit capacity $3,300.0 
Less:  
Letters of credit issued inside credit facilities $2.3 
Commercial paper outstanding 2,017.2 
Available capacity under existing facilities $1,280.5 

(1)    These revolving credit facilities have a renewal provision for two extensions, subject to lender approval. Each extension is for a period of one year.