Receivables (Tables)

12 Months Ended

Dec. 31, 2012

Accounts, Notes, Loans and Financing Receivable [Line Items]

Maximum And Average Outstanding Cash Proceeds

IPL’s maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program were as follows (in millions):

	2012	2011	2010
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances)	$160.0	$160.0	$160.0
Average outstanding aggregate cash proceeds (based on daily outstanding balances)	119.8	118.1	78.1
Costs incurred	1.4	1.5	1.4

Receivables Sold Under The Agreement

As of December 31, the attributes of IPL’s receivables sold under the Agreement were as follows (in millions):

	2012	2011
Customer accounts receivable	$118.2	$122.4
Unbilled utility revenues	77.4	65.4
Other receivables	2.8	7.5
Receivables sold	198.4	195.3
Less: cash proceeds (a)	130.0	140.0
Deferred proceeds	68.4	55.3
Less: allowance for doubtful accounts	1.6	1.6
Fair value of deferred proceeds	$66.8	$53.7
Outstanding receivables past due	$16.1	$15.9

(a) Changes in cash proceeds are recorded in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s Consolidated Statements of Cash Flows.

Additional Attributes Of Receivables Sold Under The Agreement

Additional attributes of IPL’s receivables sold under the Agreement were as follows (in millions):

	2012	2011	2010
Collections reinvested in receivables	$1,771.6	$1,795.7	$1,354.2
Credit losses, net of recoveries	10.0	10.9	7.9

Advances For Customer Energy Efficiency Projects

At December 31, outstanding advances for customer energy efficiency projects were as follows (in millions):

	Alliant Energy				IPL				WPL
	2012		2011		2012		2011		2012		2011
Current portion		$14.9		$22.2		$0.8		$1.7		$14.1		$20.5
Non-current portion	13.0		28.2		0.6		1.7		12.4		26.5
		$27.9		$50.4		$1.4		$3.4		$26.5		$47.0

IPL [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Maximum And Average Outstanding Cash Proceeds

IPL’s maximum and average outstanding cash proceeds, and costs incurred related to the sales of accounts receivable program were as follows (in millions):

	2012	2011	2010
Maximum outstanding aggregate cash proceeds (based on daily outstanding balances)	$160.0	$160.0	$160.0
Average outstanding aggregate cash proceeds (based on daily outstanding balances)	119.8	118.1	78.1
Costs incurred	1.4	1.5	1.4

Receivables Sold Under The Agreement

As of December 31, the attributes of IPL’s receivables sold under the Agreement were as follows (in millions):

	2012	2011
Customer accounts receivable	$118.2	$122.4
Unbilled utility revenues	77.4	65.4
Other receivables	2.8	7.5
Receivables sold	198.4	195.3
Less: cash proceeds (a)	130.0	140.0
Deferred proceeds	68.4	55.3
Less: allowance for doubtful accounts	1.6	1.6
Fair value of deferred proceeds	$66.8	$53.7
Outstanding receivables past due	$16.1	$15.9

(a) Changes in cash proceeds are recorded in “Sales of accounts receivable” in operating activities in Alliant Energy’s and IPL’s Consolidated Statements of Cash Flows.

Additional Attributes Of Receivables Sold Under The Agreement

Additional attributes of IPL’s receivables sold under the Agreement were as follows (in millions):

	2012	2011	2010
Collections reinvested in receivables	$1,771.6	$1,795.7	$1,354.2
Credit losses, net of recoveries	10.0	10.9	7.9

Advances For Customer Energy Efficiency Projects

At December 31, outstanding advances for customer energy efficiency projects were as follows (in millions):

	Alliant Energy				IPL				WPL
	2012		2011		2012		2011		2012		2011
Current portion		$14.9		$22.2		$0.8		$1.7		$14.1		$20.5
Non-current portion	13.0		28.2		0.6		1.7		12.4		26.5
		$27.9		$50.4		$1.4		$3.4		$26.5		$47.0

WPL [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Advances For Customer Energy Efficiency Projects

At December 31, outstanding advances for customer energy efficiency projects were as follows (in millions):

	Alliant Energy				IPL				WPL
	2012		2011		2012		2011		2012		2011
Current portion		$14.9		$22.2		$0.8		$1.7		$14.1		$20.5
Non-current portion	13.0		28.2		0.6		1.7		12.4		26.5
		$27.9		$50.4		$1.4		$3.4		$26.5		$47.0