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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2014
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates
The overall income tax rates shown in the following table 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
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(13.0
)
 
(12.9
)
 
(39.2
)
 
(38.9
)
 
—

 
—

Effect of rate-making on property-related differences
(8.6
)
 
(6.2
)
 
(22.4
)
 
(16.5
)
 
(0.8
)
 
(1.4
)
Production tax credits
(6.8
)
 
(7.7
)
 
(9.3
)
 
(10.6
)
 
(6.2
)
 
(6.6
)
Other items, net
0.7

 
1.6

 
2.2

 
0.4

 
—

 
3.7

Overall income tax rate
7.3
%
 
9.8
%
 
(33.7
%)
 
(30.6
%)
 
28.0
%
 
30.7
%
 
Alliant Energy
 
IPL
 
WPL
Nine Months Ended September 30
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.4
)
 
(12.6
)
 
(36.5
)
 
(37.8
)
 
—

 
—

Effect of rate-making on property-related differences
(6.7
)
 
(5.9
)
 
(18.4
)
 
(16.1
)
 
(0.7
)
 
(0.8
)
Production tax credits
(6.6
)
 
(7.7
)
 
(8.8
)
 
(10.4
)
 
(6.2
)
 
(6.9
)
Other items, net
2.9

 
2.6

 
3.2

 
0.8

 
3.0

 
4.4

Overall income tax rate
12.2
%
 
11.4
%
 
(25.5
%)
 
(28.5
%)
 
31.1
%
 
31.7
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions):
 
End of Production
 
Nameplate
 
Three Months
 
Nine Months
 
Tax Credit Generation
 
Capacity in MW
 
2014
 
2013
 
2014
 
2013
Cedar Ridge (WPL)
December 2018
 
68

 

$0.6

 

$0.6

 

$2.8

 

$2.9

Bent Tree - Phase I (WPL)
February 2021
 
201

 
2.0

 
2.2

 
9.4

 
9.2

Subtotal (WPL)
 
 
 
 
2.6

 
2.8

 
12.2

 
12.1

Whispering Willow - East (IPL)
December 2019
 
200

 
2.0

 
2.3

 
9.8

 
10.3

 
 
 
 
 

$4.6

 

$5.1

 

$22.0

 

$22.4
Summary Of Tax Credit Carryforwards
At September 30, 2014, 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

$710

 

$244

 
2029
State net operating losses
744

 
37

 
2018
Federal tax credits
193

 
190

 
2022
 
 
 

$471

 
 

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

$310

 

$106

 
2029
State net operating losses
217

 
11

 
2018
Federal tax credits
64

 
63

 
2022
 
 
 

$180

 
 

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

$305

 

$105

 
2029
State net operating losses
116

 
6

 
2018
Federal tax credits
71

 
69

 
2022
 
 
 

$180

 
 
IPL [Member]
  
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates
The overall income tax rates shown in the following table 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
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(13.0
)
 
(12.9
)
 
(39.2
)
 
(38.9
)
 
—

 
—

Effect of rate-making on property-related differences
(8.6
)
 
(6.2
)
 
(22.4
)
 
(16.5
)
 
(0.8
)
 
(1.4
)
Production tax credits
(6.8
)
 
(7.7
)
 
(9.3
)
 
(10.6
)
 
(6.2
)
 
(6.6
)
Other items, net
0.7

 
1.6

 
2.2

 
0.4

 
—

 
3.7

Overall income tax rate
7.3
%
 
9.8
%
 
(33.7
%)
 
(30.6
%)
 
28.0
%
 
30.7
%
 
Alliant Energy
 
IPL
 
WPL
Nine Months Ended September 30
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.4
)
 
(12.6
)
 
(36.5
)
 
(37.8
)
 
—

 
—

Effect of rate-making on property-related differences
(6.7
)
 
(5.9
)
 
(18.4
)
 
(16.1
)
 
(0.7
)
 
(0.8
)
Production tax credits
(6.6
)
 
(7.7
)
 
(8.8
)
 
(10.4
)
 
(6.2
)
 
(6.9
)
Other items, net
2.9

 
2.6

 
3.2

 
0.8

 
3.0

 
4.4

Overall income tax rate
12.2
%
 
11.4
%
 
(25.5
%)
 
(28.5
%)
 
31.1
%
 
31.7
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions):
 
End of Production
 
Nameplate
 
Three Months
 
Nine Months
 
Tax Credit Generation
 
Capacity in MW
 
2014
 
2013
 
2014
 
2013
Cedar Ridge (WPL)
December 2018
 
68

 

$0.6

 

$0.6

 

$2.8

 

$2.9

Bent Tree - Phase I (WPL)
February 2021
 
201

 
2.0

 
2.2

 
9.4

 
9.2

Subtotal (WPL)
 
 
 
 
2.6

 
2.8

 
12.2

 
12.1

Whispering Willow - East (IPL)
December 2019
 
200

 
2.0

 
2.3

 
9.8

 
10.3

 
 
 
 
 

$4.6

 

$5.1

 

$22.0

 

$22.4
Summary Of Tax Credit Carryforwards
At September 30, 2014, 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

$710

 

$244

 
2029
State net operating losses
744

 
37

 
2018
Federal tax credits
193

 
190

 
2022
 
 
 

$471

 
 

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

$310

 

$106

 
2029
State net operating losses
217

 
11

 
2018
Federal tax credits
64

 
63

 
2022
 
 
 

$180

 
 

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

$305

 

$105

 
2029
State net operating losses
116

 
6

 
2018
Federal tax credits
71

 
69

 
2022
 
 
 

$180

 
 
WPL [Member]
  
Income Taxes [Line Items]  
Schedule Of Effective Income Tax Rates
The overall income tax rates shown in the following table 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
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(13.0
)
 
(12.9
)
 
(39.2
)
 
(38.9
)
 
—

 
—

Effect of rate-making on property-related differences
(8.6
)
 
(6.2
)
 
(22.4
)
 
(16.5
)
 
(0.8
)
 
(1.4
)
Production tax credits
(6.8
)
 
(7.7
)
 
(9.3
)
 
(10.6
)
 
(6.2
)
 
(6.6
)
Other items, net
0.7

 
1.6

 
2.2

 
0.4

 
—

 
3.7

Overall income tax rate
7.3
%
 
9.8
%
 
(33.7
%)
 
(30.6
%)
 
28.0
%
 
30.7
%
 
Alliant Energy
 
IPL
 
WPL
Nine Months Ended September 30
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Statutory federal income tax rate
35.0
 %
 
35.0
 %
 
35.0
%
 
35.0
%
 
35.0
 %
 
35.0
 %
IPL’s tax benefit riders
(12.4
)
 
(12.6
)
 
(36.5
)
 
(37.8
)
 
—

 
—

Effect of rate-making on property-related differences
(6.7
)
 
(5.9
)
 
(18.4
)
 
(16.1
)
 
(0.7
)
 
(0.8
)
Production tax credits
(6.6
)
 
(7.7
)
 
(8.8
)
 
(10.4
)
 
(6.2
)
 
(6.9
)
Other items, net
2.9

 
2.6

 
3.2

 
0.8

 
3.0

 
4.4

Overall income tax rate
12.2
%
 
11.4
%
 
(25.5
%)
 
(28.5
%)
 
31.1
%
 
31.7
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and nine months ended September 30, details regarding production tax credits (net of state tax impacts) related to various wind projects are as follows (dollars in millions):
 
End of Production
 
Nameplate
 
Three Months
 
Nine Months
 
Tax Credit Generation
 
Capacity in MW
 
2014
 
2013
 
2014
 
2013
Cedar Ridge (WPL)
December 2018
 
68

 

$0.6

 

$0.6

 

$2.8

 

$2.9

Bent Tree - Phase I (WPL)
February 2021
 
201

 
2.0

 
2.2

 
9.4

 
9.2

Subtotal (WPL)
 
 
 
 
2.6

 
2.8

 
12.2

 
12.1

Whispering Willow - East (IPL)
December 2019
 
200

 
2.0

 
2.3

 
9.8

 
10.3

 
 
 
 
 

$4.6

 

$5.1

 

$22.0

 

$22.4
Summary Of Tax Credit Carryforwards
At September 30, 2014, 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

$710

 

$244

 
2029
State net operating losses
744

 
37

 
2018
Federal tax credits
193

 
190

 
2022
 
 
 

$471

 
 

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

$310

 

$106

 
2029
State net operating losses
217

 
11

 
2018
Federal tax credits
64

 
63

 
2022
 
 
 

$180

 
 

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

$305

 

$105

 
2029
State net operating losses
116

 
6

 
2018
Federal tax credits
71

 
69

 
2022
 
 
 

$180