Debt

3 Months Ended

Mar. 31, 2019

Debt [Line Items]

Debt

DEBT

NOTE 6(a) Short-term Debt - In March 2019, Alliant Energy, IPL and WPL extended their single credit facility agreement by one year, which currently expires in August 2023. As of March 31, 2019, the short-term borrowing capacity under the agreement totaled $1 billion ($450 million for Alliant Energy at the parent company, $250 million for IPL and $300 million for WPL). Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2019	Alliant Energy	IPL	WPL
Commercial paper outstanding	$514.7	$—	$138.4
Commercial paper weighted average interest rates	2.6%	N/A	2.5%
Available credit facility capacity (a)	$370.3	$135.0	$161.6

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2019	2018	2019	2018	2019	2018
Maximum amount outstanding (based on daily outstanding balances)	$600.6	$336.4	$50.4	$3.0	$195.1	$36.7
Average amount outstanding (based on daily outstanding balances)	$498.8	$310.1	$0.6	$—	$138.1	$11.5
Weighted average interest rates	2.7%	1.9%	2.8%	1.8%	2.5%	1.6%

(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, 2019.

NOTE 6(b) Long-term Debt - As of March 31, 2019, $115.0 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, 2019, this commercial paper balance had a 2.7% interest rate.

In April 2019, IPL issued $300 million of 3.6% senior debentures due 2029. The senior debentures were issued as green bonds, and all of the net proceeds were allocated for the construction and development of IPL’s wind projects.

IPL [Member]

Debt [Line Items]

Debt

DEBT

NOTE 6(a) Short-term Debt - In March 2019, Alliant Energy, IPL and WPL extended their single credit facility agreement by one year, which currently expires in August 2023. As of March 31, 2019, the short-term borrowing capacity under the agreement totaled $1 billion ($450 million for Alliant Energy at the parent company, $250 million for IPL and $300 million for WPL). Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2019	Alliant Energy	IPL	WPL
Commercial paper outstanding	$514.7	$—	$138.4
Commercial paper weighted average interest rates	2.6%	N/A	2.5%
Available credit facility capacity (a)	$370.3	$135.0	$161.6

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2019	2018	2019	2018	2019	2018
Maximum amount outstanding (based on daily outstanding balances)	$600.6	$336.4	$50.4	$3.0	$195.1	$36.7
Average amount outstanding (based on daily outstanding balances)	$498.8	$310.1	$0.6	$—	$138.1	$11.5
Weighted average interest rates	2.7%	1.9%	2.8%	1.8%	2.5%	1.6%

(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, 2019.

NOTE 6(b) Long-term Debt - As of March 31, 2019, $115.0 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, 2019, this commercial paper balance had a 2.7% interest rate.

In April 2019, IPL issued $300 million of 3.6% senior debentures due 2029. The senior debentures were issued as green bonds, and all of the net proceeds were allocated for the construction and development of IPL’s wind projects.

WPL [Member]

Debt [Line Items]

Debt

DEBT

NOTE 6(a) Short-term Debt - In March 2019, Alliant Energy, IPL and WPL extended their single credit facility agreement by one year, which currently expires in August 2023. As of March 31, 2019, the short-term borrowing capacity under the agreement totaled $1 billion ($450 million for Alliant Energy at the parent company, $250 million for IPL and $300 million for WPL). Information regarding commercial paper classified as short-term debt was as follows (dollars in millions):

March 31, 2019	Alliant Energy	IPL	WPL
Commercial paper outstanding	$514.7	$—	$138.4
Commercial paper weighted average interest rates	2.6%	N/A	2.5%
Available credit facility capacity (a)	$370.3	$135.0	$161.6

	Alliant Energy		IPL		WPL
Three Months Ended March 31	2019	2018	2019	2018	2019	2018
Maximum amount outstanding (based on daily outstanding balances)	$600.6	$336.4	$50.4	$3.0	$195.1	$36.7
Average amount outstanding (based on daily outstanding balances)	$498.8	$310.1	$0.6	$—	$138.1	$11.5
Weighted average interest rates	2.7%	1.9%	2.8%	1.8%	2.5%	1.6%

(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, 2019.