Debt

3 Months Ended

Mar. 31, 2018

Debt [Line Items]

Debt

DEBT

Note 7(a) Short-term Debt - Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2018	Alliant Energy	IPL	WPL
Commercial paper outstanding	$336.4	$—	$30.6
Commercial paper weighted average interest rates	2.3%	N/A	1.8%
Available credit facility capacity (a)	$617.7	$204.1	$319.4

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2018	2017	2018	2017	2018	2017
Maximum amount outstanding (based on daily outstanding balances)	$336.4	$325.5	$3.0	$9.2	$36.7	$113.6
Average amount outstanding (based on daily outstanding balances)	$310.1	$276.5	$—	$0.1	$11.5	$79.1
Weighted average interest rates	1.9%	0.9%	1.8%	1.1%	1.6%	0.7%

(a) Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at March 31, 2018.

NOTE 7(b) Long-term Debt - As of March 31, 2018, $45.9 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s balance sheets due to the existence of a long-term credit facility that back-stops this commercial paper balance, along with Alliant Energy’s and IPL’s intent and ability to refinance these balances on a long-term basis. As of March 31, 2018, this commercial paper balance had a 2.3% interest rate.

In April 2018, AEF entered into a $300 million variable-rate (2.3% at April 30, 2018) term loan credit agreement (with Alliant Energy as guarantor) and used the proceeds from borrowings under this agreement for general corporate purposes. AEF’s term loan credit agreement expires in April 2020 and includes substantially the same financial covenants that are included in Alliant Energy’s credit facility agreement.

IPL [Member]

Debt [Line Items]

Debt

DEBT

Note 7(a) Short-term Debt - Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2018	Alliant Energy	IPL	WPL
Commercial paper outstanding	$336.4	$—	$30.6
Commercial paper weighted average interest rates	2.3%	N/A	1.8%
Available credit facility capacity (a)	$617.7	$204.1	$319.4

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2018	2017	2018	2017	2018	2017
Maximum amount outstanding (based on daily outstanding balances)	$336.4	$325.5	$3.0	$9.2	$36.7	$113.6
Average amount outstanding (based on daily outstanding balances)	$310.1	$276.5	$—	$0.1	$11.5	$79.1
Weighted average interest rates	1.9%	0.9%	1.8%	1.1%	1.6%	0.7%

(a) Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at March 31, 2018.

NOTE 7(b) Long-term Debt - As of March 31, 2018, $45.9 million of commercial paper was recorded in “Long-term debt, net” on Alliant Energy’s and IPL’s balance sheets due to the existence of a long-term credit facility that back-stops this commercial paper balance, along with Alliant Energy’s and IPL’s intent and ability to refinance these balances on a long-term basis. As of March 31, 2018, this commercial paper balance had a 2.3% interest rate.

WPL [Member]

Debt [Line Items]

Debt

DEBT

Note 7(a) Short-term Debt - Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2018	Alliant Energy	IPL	WPL
Commercial paper outstanding	$336.4	$—	$30.6
Commercial paper weighted average interest rates	2.3%	N/A	1.8%
Available credit facility capacity (a)	$617.7	$204.1	$319.4

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2018	2017	2018	2017	2018	2017
Maximum amount outstanding (based on daily outstanding balances)	$336.4	$325.5	$3.0	$9.2	$36.7	$113.6
Average amount outstanding (based on daily outstanding balances)	$310.1	$276.5	$—	$0.1	$11.5	$79.1
Weighted average interest rates	1.9%	0.9%	1.8%	1.1%	1.6%	0.7%

(a) Alliant Energy’s and IPL’s available credit facility capacities reflect outstanding commercial paper classified as both short- and long-term debt at March 31, 2018.