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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax [Line Items]  
Schedule Of Effective Income Tax Rates
The overall income tax rates shown in the following table for the three and nine months ended September 30 were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes.
 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.9
)
 
(10.3
)
 
(38.9
)
 
(34.2
)
 
—

 
—

Production tax credits
(7.7
)
 
(5.5
)
 
(10.6
)
 
(8.6
)
 
(6.6
)
 
(4.3
)
Effect of rate-making on property-related differences
(6.2
)
 
(4.7
)
 
(16.5
)
 
(11.2
)
 
(1.4
)
 
(1.1
)
Other items, net
1.6

 
5.9

 
0.4

 
6.4

 
3.7

 
5.9

Overall income tax rate
9.8
%
 
20.4
%
 
(30.6
%)
 
(12.6
%)
 
30.7
%
 
35.5
%
 
Alliant Energy
 
IPL
 
WPL
Nine Months Ended September 30
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.6
)
 
(11.0
)
 
(37.8
)
 
(34.5
)
 
—

 
—

Production tax credits
(7.7
)
 
(6.0
)
 
(10.4
)
 
(8.6
)
 
(6.9
)
 
(5.5
)
Effect of rate-making on property-related differences
(5.9
)
 
(4.3
)
 
(16.1
)
 
(10.6
)
 
(0.8
)
 
(1.5
)
State apportionment change due to planned sale of RMT
—

 
4.3

 
—

 
6.9

 
—

 
3.5

Other items, net
2.6

 
6.0

 
0.8

 
6.2

 
4.4

 
6.2

Overall income tax rate
11.4
%
 
24.0
%
 
(28.5
%)
 
(5.6
%)
 
31.7
%
 
37.7
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and nine months ended September 30, production tax credits (net of state tax impacts) resulting from these wind projects are included in the table below (in millions). Production tax credits for Bent Tree - Phase I and Whispering Willow - East increased for the three- and nine-month periods primarily due to higher levels of electricity output generated by the wind projects.
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Cedar Ridge (WPL)

$0.6

 

$0.7

 

$2.9

 

$3.0

Bent Tree - Phase I (WPL)
2.2

 
1.8

 
9.2

 
6.0

Subtotal (WPL)
2.8

 
2.5

 
12.1

 
9.0

Whispering Willow - East (IPL)
2.3

 
2.0

 
10.3

 
8.7

 

$5.1

 

$4.5

 

$22.4

 

$17.7
Summary Of Tax Credit Carryforwards
At September 30, 2013, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions):
Alliant Energy
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$775

 

$266

 
2029
State net operating losses
753

 
39

 
2018
Federal tax credits
161

 
159

 
2022
 
 
 

$464

 
 

IPL
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$344

 

$118

 
2029
State net operating losses
189

 
10

 
2018
Federal tax credits
49

 
48

 
2022
 
 
 

$176

 
 

WPL
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$321

 

$110

 
2029
State net operating losses
177

 
9

 
2018
Federal tax credits
54

 
53

 
2022
 
 
 

$172

 
 
IPL [Member]
  
Income Tax [Line Items]  
Schedule Of Effective Income Tax Rates
The overall income tax rates shown in the following table for the three and nine months ended September 30 were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes.
 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.9
)
 
(10.3
)
 
(38.9
)
 
(34.2
)
 
—

 
—

Production tax credits
(7.7
)
 
(5.5
)
 
(10.6
)
 
(8.6
)
 
(6.6
)
 
(4.3
)
Effect of rate-making on property-related differences
(6.2
)
 
(4.7
)
 
(16.5
)
 
(11.2
)
 
(1.4
)
 
(1.1
)
Other items, net
1.6

 
5.9

 
0.4

 
6.4

 
3.7

 
5.9

Overall income tax rate
9.8
%
 
20.4
%
 
(30.6
%)
 
(12.6
%)
 
30.7
%
 
35.5
%
 
Alliant Energy
 
IPL
 
WPL
Nine Months Ended September 30
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.6
)
 
(11.0
)
 
(37.8
)
 
(34.5
)
 
—

 
—

Production tax credits
(7.7
)
 
(6.0
)
 
(10.4
)
 
(8.6
)
 
(6.9
)
 
(5.5
)
Effect of rate-making on property-related differences
(5.9
)
 
(4.3
)
 
(16.1
)
 
(10.6
)
 
(0.8
)
 
(1.5
)
State apportionment change due to planned sale of RMT
—

 
4.3

 
—

 
6.9

 
—

 
3.5

Other items, net
2.6

 
6.0

 
0.8

 
6.2

 
4.4

 
6.2

Overall income tax rate
11.4
%
 
24.0
%
 
(28.5
%)
 
(5.6
%)
 
31.7
%
 
37.7
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and nine months ended September 30, production tax credits (net of state tax impacts) resulting from these wind projects are included in the table below (in millions). Production tax credits for Bent Tree - Phase I and Whispering Willow - East increased for the three- and nine-month periods primarily due to higher levels of electricity output generated by the wind projects.
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Cedar Ridge (WPL)

$0.6

 

$0.7

 

$2.9

 

$3.0

Bent Tree - Phase I (WPL)
2.2

 
1.8

 
9.2

 
6.0

Subtotal (WPL)
2.8

 
2.5

 
12.1

 
9.0

Whispering Willow - East (IPL)
2.3

 
2.0

 
10.3

 
8.7

 

$5.1

 

$4.5

 

$22.4

 

$17.7
Summary Of Tax Credit Carryforwards
At September 30, 2013, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions):
Alliant Energy
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$775

 

$266

 
2029
State net operating losses
753

 
39

 
2018
Federal tax credits
161

 
159

 
2022
 
 
 

$464

 
 

IPL
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$344

 

$118

 
2029
State net operating losses
189

 
10

 
2018
Federal tax credits
49

 
48

 
2022
 
 
 

$176

 
 

WPL
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$321

 

$110

 
2029
State net operating losses
177

 
9

 
2018
Federal tax credits
54

 
53

 
2022
 
 
 

$172

 
 
WPL [Member]
  
Income Tax [Line Items]  
Schedule Of Effective Income Tax Rates
The overall income tax rates shown in the following table for the three and nine months ended September 30 were computed by dividing income tax expense (benefit) by income from continuing operations before income taxes.
 
Alliant Energy
 
IPL
 
WPL
Three Months Ended September 30
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.9
)
 
(10.3
)
 
(38.9
)
 
(34.2
)
 
—

 
—

Production tax credits
(7.7
)
 
(5.5
)
 
(10.6
)
 
(8.6
)
 
(6.6
)
 
(4.3
)
Effect of rate-making on property-related differences
(6.2
)
 
(4.7
)
 
(16.5
)
 
(11.2
)
 
(1.4
)
 
(1.1
)
Other items, net
1.6

 
5.9

 
0.4

 
6.4

 
3.7

 
5.9

Overall income tax rate
9.8
%
 
20.4
%
 
(30.6
%)
 
(12.6
%)
 
30.7
%
 
35.5
%
 
Alliant Energy
 
IPL
 
WPL
Nine Months Ended September 30
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.6
)
 
(11.0
)
 
(37.8
)
 
(34.5
)
 
—

 
—

Production tax credits
(7.7
)
 
(6.0
)
 
(10.4
)
 
(8.6
)
 
(6.9
)
 
(5.5
)
Effect of rate-making on property-related differences
(5.9
)
 
(4.3
)
 
(16.1
)
 
(10.6
)
 
(0.8
)
 
(1.5
)
State apportionment change due to planned sale of RMT
—

 
4.3

 
—

 
6.9

 
—

 
3.5

Other items, net
2.6

 
6.0

 
0.8

 
6.2

 
4.4

 
6.2

Overall income tax rate
11.4
%
 
24.0
%
 
(28.5
%)
 
(5.6
%)
 
31.7
%
 
37.7
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and nine months ended September 30, production tax credits (net of state tax impacts) resulting from these wind projects are included in the table below (in millions). Production tax credits for Bent Tree - Phase I and Whispering Willow - East increased for the three- and nine-month periods primarily due to higher levels of electricity output generated by the wind projects.
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Cedar Ridge (WPL)

$0.6

 

$0.7

 

$2.9

 

$3.0

Bent Tree - Phase I (WPL)
2.2

 
1.8

 
9.2

 
6.0

Subtotal (WPL)
2.8

 
2.5

 
12.1

 
9.0

Whispering Willow - East (IPL)
2.3

 
2.0

 
10.3

 
8.7

 

$5.1

 

$4.5

 

$22.4

 

$17.7
Summary Of Tax Credit Carryforwards
At September 30, 2013, tax carryforwards and associated deferred tax assets and expiration dates were estimated as follows (dollars in millions):
Alliant Energy
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$775

 

$266

 
2029
State net operating losses
753

 
39

 
2018
Federal tax credits
161

 
159

 
2022
 
 
 

$464

 
 

IPL
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$344

 

$118

 
2029
State net operating losses
189

 
10

 
2018
Federal tax credits
49

 
48

 
2022
 
 
 

$176

 
 

WPL
Carryforward
Amount
 
Deferred
Tax Assets
 
Earliest
Expiration Date
Federal net operating losses

$321

 

$110

 
2029
State net operating losses
177

 
9

 
2018
Federal tax credits
54

 
53

 
2022
 
 
 

$172