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Debt
3 Months Ended
Mar. 31, 2020
Debt [Line Items]  
Debt DEBT
NOTE 6(a) Short-term Debt - Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):
March 31, 2020
Alliant Energy
 
IPL
 
WPL
Amount outstanding
$270.5
 
$—
 
$182.0
Weighted average interest rates
1.6%
 
N/A
 
1.7%
Available credit facility capacity
$729.5
 
$250.0
 
$118.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended March 31
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Maximum amount outstanding (based on daily outstanding balances)
$462.5
 
$600.6
 
$0.8
 
$50.4
 
$212.0
 
$195.1
Average amount outstanding (based on daily outstanding balances)
$382.3
 
$498.8
 
$—
 
$0.6
 
$167.0
 
$138.1
Weighted average interest rates
1.8%
 
2.7%
 
1.8%
 
2.8%
 
1.8%
 
2.5%


NOTE 6(b) Long-term Debt - In March 2020, AEF entered into a $300 million variable rate (1% as of March 31, 2020) term loan credit agreement (with Alliant Energy as guarantor) and used the borrowings under this agreement to retire its $300 million variable rate term loan credit agreement that would have expired in April 2020. AEF’s current term loan credit agreement expires in March 2022 and includes substantially the same financial covenants that are included in Alliant Energy’s credit facility agreement.

In April 2020, WPL issued $350 million of 3.65% debentures due 2050. The net proceeds from the issuance were used by WPL to reduce borrowings under the single credit facility and for general corporate purposes.
IPL [Member]  
Debt [Line Items]  
Debt DEBT
NOTE 6(a) Short-term Debt - Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):
March 31, 2020
Alliant Energy
 
IPL
 
WPL
Amount outstanding
$270.5
 
$—
 
$182.0
Weighted average interest rates
1.6%
 
N/A
 
1.7%
Available credit facility capacity
$729.5
 
$250.0
 
$118.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended March 31
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Maximum amount outstanding (based on daily outstanding balances)
$462.5
 
$600.6
 
$0.8
 
$50.4
 
$212.0
 
$195.1
Average amount outstanding (based on daily outstanding balances)
$382.3
 
$498.8
 
$—
 
$0.6
 
$167.0
 
$138.1
Weighted average interest rates
1.8%
 
2.7%
 
1.8%
 
2.8%
 
1.8%
 
2.5%

WPL [Member]  
Debt [Line Items]  
Debt DEBT
NOTE 6(a) Short-term Debt - Information regarding Alliant Energy’s, IPL’s and WPL’s commercial paper, and Alliant Energy’s and WPL’s borrowings under the single credit facility, which currently expires in August 2023, classified as short-term debt was as follows (dollars in millions):
March 31, 2020
Alliant Energy
 
IPL
 
WPL
Amount outstanding
$270.5
 
$—
 
$182.0
Weighted average interest rates
1.6%
 
N/A
 
1.7%
Available credit facility capacity
$729.5
 
$250.0
 
$118.0

 
Alliant Energy
 
IPL
 
WPL
Three Months Ended March 31
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Maximum amount outstanding (based on daily outstanding balances)
$462.5
 
$600.6
 
$0.8
 
$50.4
 
$212.0
 
$195.1
Average amount outstanding (based on daily outstanding balances)
$382.3
 
$498.8
 
$—
 
$0.6
 
$167.0
 
$138.1
Weighted average interest rates
1.8%
 
2.7%
 
1.8%
 
2.8%
 
1.8%
 
2.5%


NOTE 6(b) Long-term Debt - In March 2020, AEF entered into a $300 million variable rate (1% as of March 31, 2020) term loan credit agreement (with Alliant Energy as guarantor) and used the borrowings under this agreement to retire its $300 million variable rate term loan credit agreement that would have expired in April 2020. AEF’s current term loan credit agreement expires in March 2022 and includes substantially the same financial covenants that are included in Alliant Energy’s credit facility agreement.

In April 2020, WPL issued $350 million of 3.65% debentures due 2050. The net proceeds from the issuance were used by WPL to reduce borrowings under the single credit facility and for general corporate purposes.