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Short-Term Debt and Lines of Credit (Tables)
 12 Months Ended
Dec. 31, 2021
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)20212020
Commercial paper
Amount outstanding at December 31$1,896.1 $1,436.9 
Average interest rate on amounts outstanding at December 310.26 %0.21 %
Term loan
Amount outstanding at December 31$— $340.0 
Average interest rate on amounts outstanding at December 31N/A0.99 %
Operating expense loans
Amount outstanding at December 31 (1)
$0.9 $— 

(1)Coyote Ridge and Tatanka Ridge entered into operating expense loans. In accordance with their limited liability company operating agreements, they received loans from their owners 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)Maturity2021
Revolving credit facility (WEC Energy Group) (1)
September 2026$1,500.0 
Revolving credit facility (WE) (1)
September 2026500.0 
Revolving credit facility (WPS) (2)
October 2022400.0 
Revolving credit facility (WG) (1)
September 2026350.0 
Revolving credit facility (PGL) (1)
September 2026350.0 
Total short-term credit capacity $3,100.0 
Less:  
Letters of credit issued inside credit facilities $2.3 
Commercial paper outstanding 1,896.1 
Available capacity under existing facilities $1,201.6 

(1)    In September 2021, WEC Energy Group increased its credit facility to $1,500.0 million, and each of WEC Energy Group, WE, WG, and PGL extended the maturities of their credit facilities to September 2026.

(2)    WPS intends to request approval from the PSCW to extend the maturity of its credit facility to September 2026. Lenders have agreed to the extension, subject to WPS's receipt of PSCW approval.