Short-Term Debt

6 Months Ended

Jun. 30, 2011

Short-Term Debt

(7) SHORT-TERM DEBT

At June 30, 2011, there was no commercial paper outstanding at IPL, WPL or the Alliant Energy parent company. Information regarding commercial paper issued under Alliant Energy's, IPL's and WPL's credit facilities and other short-term borrowings was as follows (dollars in millions):

	Alliant Energy		Parent
At June 30, 2011:	(Consolidated)		Company		IPL		WPL
Available credit facility capacity	$	623	$	96	$	287	$	240

	Alliant Energy						IPL						WPL
	2011			2010			2011			2010			2011			2010
Three months ended June 30:
Maximum amount of total short-term debt outstanding (based on daily outstanding balances)	$	94.3		$	264.0		$	54.4		$	133.0		$	44.3		$	152.0
Average amount of total short-term debt outstanding (based on daily outstanding balances)	$	28.7		$	129.5		$	18.3		$	68.4		$	14.2		$	77.4
Weighted average interest rates - total short-term debt		0.31	%		0.34	%		0.32	%		0.38	%		0.30	%		0.31	%
Six months ended June 30:
Maximum amount of total short-term debt outstanding (based on daily outstanding balances)	$	96.5		$	350.3		$	54.4		$	219.1		$	96.5		$	170.2
Average amount of total short-term debt outstanding (based on daily outstanding balances)	$	42.0		$	178.3		$	9.8		$	125.2		$	34.7		$	66.5
Weighted average interest rates - total short-term debt		0.31	%		0.32	%		0.32	%		0.34	%		0.31	%		0.29	%

IPL [Member]

Short-Term Debt

(7) SHORT-TERM DEBT

At June 30, 2011, there was no commercial paper outstanding at IPL, WPL or the Alliant Energy parent company. Information regarding commercial paper issued under Alliant Energy's, IPL's and WPL's credit facilities and other short-term borrowings was as follows (dollars in millions):

	Alliant Energy		Parent
At June 30, 2011:	(Consolidated)		Company		IPL		WPL
Available credit facility capacity	$	623	$	96	$	287	$	240

	Alliant Energy						IPL						WPL
	2011			2010			2011			2010			2011			2010
Three months ended June 30:
Maximum amount of total short-term debt outstanding (based on daily outstanding balances)	$	94.3		$	264.0		$	54.4		$	133.0		$	44.3		$	152.0
Average amount of total short-term debt outstanding (based on daily outstanding balances)	$	28.7		$	129.5		$	18.3		$	68.4		$	14.2		$	77.4
Weighted average interest rates - total short-term debt		0.31	%		0.34	%		0.32	%		0.38	%		0.30	%		0.31	%
Six months ended June 30:
Maximum amount of total short-term debt outstanding (based on daily outstanding balances)	$	96.5		$	350.3		$	54.4		$	219.1		$	96.5		$	170.2
Average amount of total short-term debt outstanding (based on daily outstanding balances)	$	42.0		$	178.3		$	9.8		$	125.2		$	34.7		$	66.5
Weighted average interest rates - total short-term debt		0.31	%		0.32	%		0.32	%		0.34	%		0.31	%		0.29	%

WPL [Member]

Short-Term Debt

(7) SHORT-TERM DEBT

At June 30, 2011, there was no commercial paper outstanding at IPL, WPL or the Alliant Energy parent company. Information regarding commercial paper issued under Alliant Energy's, IPL's and WPL's credit facilities and other short-term borrowings was as follows (dollars in millions):

	Alliant Energy		Parent
At June 30, 2011:	(Consolidated)		Company		IPL		WPL
Available credit facility capacity	$	623	$	96	$	287	$	240

	Alliant Energy						IPL						WPL
	2011			2010			2011			2010			2011			2010
Three months ended June 30:
Maximum amount of total short-term debt outstanding (based on daily outstanding balances)	$	94.3		$	264.0		$	54.4		$	133.0		$	44.3		$	152.0
Average amount of total short-term debt outstanding (based on daily outstanding balances)	$	28.7		$	129.5		$	18.3		$	68.4		$	14.2		$	77.4
Weighted average interest rates - total short-term debt		0.31	%		0.34	%		0.32	%		0.38	%		0.30	%		0.31	%
Six months ended June 30:
Maximum amount of total short-term debt outstanding (based on daily outstanding balances)	$	96.5		$	350.3		$	54.4		$	219.1		$	96.5		$	170.2
Average amount of total short-term debt outstanding (based on daily outstanding balances)	$	42.0		$	178.3		$	9.8		$	125.2		$	34.7		$	66.5
Weighted average interest rates - total short-term debt		0.31	%		0.32	%		0.32	%		0.34	%		0.31	%		0.29	%