Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Line Items]

Schedule Of Electric Plant

At December 31, details of electric plant were as follows (in millions):

	Alliant Energy				IPL				WPL
	2013		2012		2013		2012		2013		2012
Plant in service:
Generation (a)		$4,792.0		$4,798.9		$2,513.2		$2,393.0		$2,278.8		$2,405.9
Distribution	4,179.6		3,981.5		2,311.2		2,205.9		1,868.4		1,775.6
Other	286.3		290.3		210.5		216.3		75.8		74.0
Plant anticipated to be retired early (b)	157.8		—		—		—		157.8		—
		$9,415.7		$9,070.7		$5,034.9		$4,815.2		$4,380.8		$4,255.5

(a) The decrease in Alliant Energy’s and WPL’s generation portion of electric plant in service was primarily due to classifying Edgewater Unit 3 and Nelson Dewey Units 1 and 2 as “Plant anticipated to be retired early” as of December 31, 2013, which is discussed below. Partially offsetting this decrease at Alliant Energy, and contributing to the increase in IPL’s generation portion of electric plant in service, was an increase at IPL due to a scrubber and baghouse at George Neal Unit 4 being placed in service in the fourth quarter of 2013. As of December 31, 2013, the capitalized project costs for the George Neal Unit 4 scrubber and baghouse were $61 million.

(b) In 2013, WPL received approval from MISO to retire Edgewater Unit 3, and Nelson Dewey Units 1 and 2. WPL currently anticipates retiring these EGUs by December 31, 2015, contingent on completion of transmission network upgrades needed for system reliability. WPL is recovering the remaining net book value of these EGUs over a 10-year period beginning January 1, 2013 pursuant to a May 2012 PSCW order.

Schedule Of Allowance For Funds Used During Construction

The amount of AFUDC generated by equity and debt components was as follows (in millions):

	Alliant Energy						IPL						WPL
	2013		2012		2011		2013		2012		2011		2013		2012		2011
Equity		$20.3		$14.1		$7.6		$13.8		$5.2		$3.5		$6.5		$8.9		$4.1
Debt	10.5		7.8		4.4		7.2		3.2		2.3		3.3		4.6		2.1
		$30.8		$21.9		$12.0		$21.0		$8.4		$5.8		$9.8		$13.5		$6.2

Schedule Of Allowance for Funds Used During Construction By Project

AFUDC related to various construction projects was recognized in Alliant Energy’s, IPL’s and WPL’s Consolidated Statements of Income as follows (in millions):

	2013		2012		2011
IPL:
Emission controls - Ottumwa Unit 1		$8.0		$2.0		$—
Emission controls - George Neal Units 3 and 4	5.1		0.9		—
Other	7.9		5.5		5.8
	21.0		8.4		5.8
WPL:
Emission controls - Columbia Units 1 and 2	7.2		3.9		0.2
Emission controls - Edgewater Unit 5	—		7.2		2.9
Other	2.6		2.4		3.1
	9.8		13.5		6.2
Alliant Energy		$30.8		$21.9		$12.0

IPL [Member]

Property, Plant and Equipment [Line Items]

Schedule Of Electric Plant

At December 31, details of electric plant were as follows (in millions):

	Alliant Energy				IPL				WPL
	2013		2012		2013		2012		2013		2012
Plant in service:
Generation (a)		$4,792.0		$4,798.9		$2,513.2		$2,393.0		$2,278.8		$2,405.9
Distribution	4,179.6		3,981.5		2,311.2		2,205.9		1,868.4		1,775.6
Other	286.3		290.3		210.5		216.3		75.8		74.0
Plant anticipated to be retired early (b)	157.8		—		—		—		157.8		—
		$9,415.7		$9,070.7		$5,034.9		$4,815.2		$4,380.8		$4,255.5

(a) The decrease in Alliant Energy’s and WPL’s generation portion of electric plant in service was primarily due to classifying Edgewater Unit 3 and Nelson Dewey Units 1 and 2 as “Plant anticipated to be retired early” as of December 31, 2013, which is discussed below. Partially offsetting this decrease at Alliant Energy, and contributing to the increase in IPL’s generation portion of electric plant in service, was an increase at IPL due to a scrubber and baghouse at George Neal Unit 4 being placed in service in the fourth quarter of 2013. As of December 31, 2013, the capitalized project costs for the George Neal Unit 4 scrubber and baghouse were $61 million.

(b) In 2013, WPL received approval from MISO to retire Edgewater Unit 3, and Nelson Dewey Units 1 and 2. WPL currently anticipates retiring these EGUs by December 31, 2015, contingent on completion of transmission network upgrades needed for system reliability. WPL is recovering the remaining net book value of these EGUs over a 10-year period beginning January 1, 2013 pursuant to a May 2012 PSCW order.

Schedule Of Allowance For Funds Used During Construction

The amount of AFUDC generated by equity and debt components was as follows (in millions):

	Alliant Energy						IPL						WPL
	2013		2012		2011		2013		2012		2011		2013		2012		2011
Equity		$20.3		$14.1		$7.6		$13.8		$5.2		$3.5		$6.5		$8.9		$4.1
Debt	10.5		7.8		4.4		7.2		3.2		2.3		3.3		4.6		2.1
		$30.8		$21.9		$12.0		$21.0		$8.4		$5.8		$9.8		$13.5		$6.2

Schedule Of Allowance for Funds Used During Construction By Project

AFUDC related to various construction projects was recognized in Alliant Energy’s, IPL’s and WPL’s Consolidated Statements of Income as follows (in millions):

	2013		2012		2011
IPL:
Emission controls - Ottumwa Unit 1		$8.0		$2.0		$—
Emission controls - George Neal Units 3 and 4	5.1		0.9		—
Other	7.9		5.5		5.8
	21.0		8.4		5.8
WPL:
Emission controls - Columbia Units 1 and 2	7.2		3.9		0.2
Emission controls - Edgewater Unit 5	—		7.2		2.9
Other	2.6		2.4		3.1
	9.8		13.5		6.2
Alliant Energy		$30.8		$21.9		$12.0

WPL [Member]

Property, Plant and Equipment [Line Items]

Schedule Of Electric Plant

At December 31, details of electric plant were as follows (in millions):

	Alliant Energy				IPL				WPL
	2013		2012		2013		2012		2013		2012
Plant in service:
Generation (a)		$4,792.0		$4,798.9		$2,513.2		$2,393.0		$2,278.8		$2,405.9
Distribution	4,179.6		3,981.5		2,311.2		2,205.9		1,868.4		1,775.6
Other	286.3		290.3		210.5		216.3		75.8		74.0
Plant anticipated to be retired early (b)	157.8		—		—		—		157.8		—
		$9,415.7		$9,070.7		$5,034.9		$4,815.2		$4,380.8		$4,255.5

(a) The decrease in Alliant Energy’s and WPL’s generation portion of electric plant in service was primarily due to classifying Edgewater Unit 3 and Nelson Dewey Units 1 and 2 as “Plant anticipated to be retired early” as of December 31, 2013, which is discussed below. Partially offsetting this decrease at Alliant Energy, and contributing to the increase in IPL’s generation portion of electric plant in service, was an increase at IPL due to a scrubber and baghouse at George Neal Unit 4 being placed in service in the fourth quarter of 2013. As of December 31, 2013, the capitalized project costs for the George Neal Unit 4 scrubber and baghouse were $61 million.

(b) In 2013, WPL received approval from MISO to retire Edgewater Unit 3, and Nelson Dewey Units 1 and 2. WPL currently anticipates retiring these EGUs by December 31, 2015, contingent on completion of transmission network upgrades needed for system reliability. WPL is recovering the remaining net book value of these EGUs over a 10-year period beginning January 1, 2013 pursuant to a May 2012 PSCW order.

Schedule Of Allowance For Funds Used During Construction

The amount of AFUDC generated by equity and debt components was as follows (in millions):

	Alliant Energy						IPL						WPL
	2013		2012		2011		2013		2012		2011		2013		2012		2011
Equity		$20.3		$14.1		$7.6		$13.8		$5.2		$3.5		$6.5		$8.9		$4.1
Debt	10.5		7.8		4.4		7.2		3.2		2.3		3.3		4.6		2.1
		$30.8		$21.9		$12.0		$21.0		$8.4		$5.8		$9.8		$13.5		$6.2

Schedule Of Allowance for Funds Used During Construction By Project

AFUDC related to various construction projects was recognized in Alliant Energy’s, IPL’s and WPL’s Consolidated Statements of Income as follows (in millions):

	2013		2012		2011
IPL:
Emission controls - Ottumwa Unit 1		$8.0		$2.0		$—
Emission controls - George Neal Units 3 and 4	5.1		0.9		—
Other	7.9		5.5		5.8
	21.0		8.4		5.8
WPL:
Emission controls - Columbia Units 1 and 2	7.2		3.9		0.2
Emission controls - Edgewater Unit 5	—		7.2		2.9
Other	2.6		2.4		3.1
	9.8		13.5		6.2
Alliant Energy		$30.8		$21.9		$12.0