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Short-term Debt and Lines of Credit
9 Months Ended
Sep. 30, 2015
Short-term Debt [Abstract]  
Short-term Debt and Lines of Credit
SHORT-TERM DEBT AND LINES OF CREDIT

Our outstanding short-term borrowings were as follows:
(in millions, except percentages)
 
September 30, 2015
 
December 31, 2014
Commercial paper
 
$
661.5

 
$
617.6

Weighted-average interest rate on commercial paper outstanding
 
0.32
%
 
0.22
%


Our average amount of commercial paper borrowings based on daily outstanding balances during the nine months ended September 30, 2015, was $785.6 million with a weighted-average interest rate during the period of 0.27%.

We manage our liquidity by maintaining what we believe to be adequate external financing commitments. The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing program, including remaining available capacity under these facilities:
(in millions)
 
Maturity
 
September 30, 2015
WEC Energy Group
 
December 2019
 
$
400.0

Wisconsin Electric
 
December 2019
 
500.0

Wisconsin Gas
 
December 2019
 
350.0

Integrys
 
June 2017
 
285.0

Integrys
 
May 2019
 
265.0

WPS
 
May 2019
 
135.0

WPS
 
June 2017
 
115.0

PGL
 
June 2017
 
250.0

Total short-term credit capacity
 
 
 
$
2,300.0

 
 
 
 
 
Less:
 
 
 
 

Letters of credit issued inside credit facilities
 
 
 
$
18.0

Commercial paper outstanding
 
 
 
661.5

Available capacity under existing agreements
 
 
 
$
1,620.5