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SHORT-TERM DEBT AND LINES OF CREDIT | 9 Months Ended
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Sep. 30, 2017
Short-term Debt [Abstract] |
SHORT-TERM DEBT AND LINES OF CREDIT | SHORT-TERM DEBT AND LINES OF CREDIT The following table shows our short-term borrowings and their corresponding weighted-average interest rates:
(in millions, except percentages) |  | September 30, 2017 |  | December 31, 2016
Commercial paper |  |  |  |
Amount outstanding |  | $ | 993.5 |  |  | $ | 860.2 |
Weighted-average interest rate on amounts outstanding |  | 1.38 | % |  | 0.96 | %
Our average amount of commercial paper borrowings based on daily outstanding balances during the nine months ended September 30, 2017, was $705.0 million with a weighted-average interest rate during the period of 1.21%. The information in the table below relates to our revolving credit facilities used to support our commercial paper borrowing programs, including available capacity under these facilities:
(in millions) |  | Maturity |  | September 30, 2017
WEC Energy Group (1) |  | December 2020 |  | $ | 1,050.0 |
WE (2) |  | December 2020 |  | 500.0 |
WPS (3) |  | December 2020 |  | 250.0 |
WG (2) |  | December 2020 |  | 350.0 |
PGL (2) |  | December 2020 |  | 350.0 |
Total short-term credit capacity |  |  |  | $ | 2,500.0 |
Less: |  |  |  |  |
Letters of credit issued inside credit facilities |  |  |  | $ | 32.9 |
Commercial paper outstanding |  |  |  | 993.5 |
Available capacity under existing agreements |  |  |  | $ | 1,473.6 |
(1) | In October 2017, WEC Energy Group increased its credit facility to $1,200.0 million, and extended the maturity to October 2022.
(2) | In October 2017, WE, WG, and PGL extended the maturities of their credit facilities to October 2022.
(3) | In October 2017, WPS increased its credit facility to $400.0 million. WPS intends to request approval from the PSCW to extend the maturity of its facility to October 2022.

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- Definition The entire disclosure for short-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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