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Income Taxes (Tables)
 6 Months Ended
Jun. 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 June 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
(11.9
)
 
(11.7
)
 
(36.6
)
 
(33.3
)
 
—

 
—

Production tax credits
(6.1
)
 
(7.9
)
 
(8.0
)
 
(10.5
)
 
(5.8
)
 
(7.2
)
Effect of rate-making on property-related differences
(4.8
)
 
(6.4
)
 
(14.4
)
 
(17.4
)
 
(0.2
)
 
(0.5
)
Other items, net
4.8

 
4.3

 
4.6

 
1.5

 
5.0

 
5.8

Overall income tax rate
17.0
%
 
13.3
%
 
(19.4
%)
 
(24.7
%)
 
34.0
%
 
33.1
%
 
Alliant Energy
 
IPL
 
WPL
Six Months Ended June 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
(11.9
)
 
(12.3
)
 
(32.8
)
 
(35.6
)
 
—

 
—

Production tax credits
(6.5
)
 
(7.7
)
 
(8.2
)
 
(10.1
)
 
(6.2
)
 
(7.0
)
Effect of rate-making on property-related differences
(5.1
)
 
(5.6
)
 
(13.0
)
 
(15.5
)
 
(0.7
)
 
(0.4
)
Other items, net
4.7

 
3.6

 
4.6

 
1.9

 
4.9

 
4.9

Overall income tax rate
16.2
%
 
13.0
%
 
(14.4
%)
 
(24.3
%)
 
33.0
%
 
32.5
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and six months ended June 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
 
Six Months
 
Tax Credit Generation
 
Capacity in MW
 
2014
 
2013
 
2014
 
2013
Cedar Ridge (WPL)
December 2018
 
68

 

$1.0

 

$1.1

 

$2.2

 

$2.3

Bent Tree - Phase I (WPL)
February 2021
 
201

 
3.2

 
3.5

 
7.4

 
7.0

Subtotal (WPL)
 
 
 
 
4.2

 
4.6

 
9.6

 
9.3

Whispering Willow - East (IPL)
December 2019
 
200

 
3.2

 
4.1

 
7.8

 
8.0

 
 
 
 
 

$7.4

 

$8.7

 

$17.4

 

$17.3
Summary Of Tax Credit Carryforwards
At June 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

$721

 

$248

 
2029
State net operating losses
747

 
38

 
2018
Federal tax credits
188

 
185

 
2022
 
 
 

$471

 
 

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

$317

 

$109

 
2029
State net operating losses
222

 
11

 
2018
Federal tax credits
62

 
61

 
2022
 
 
 

$181

 
 

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

$308

 

$106

 
2029
State net operating losses
114

 
6

 
2018
Federal tax credits
68

 
67

 
2022
 
 
 

$179

 
 
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 June 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
(11.9
)
 
(11.7
)
 
(36.6
)
 
(33.3
)
 
—

 
—

Production tax credits
(6.1
)
 
(7.9
)
 
(8.0
)
 
(10.5
)
 
(5.8
)
 
(7.2
)
Effect of rate-making on property-related differences
(4.8
)
 
(6.4
)
 
(14.4
)
 
(17.4
)
 
(0.2
)
 
(0.5
)
Other items, net
4.8

 
4.3

 
4.6

 
1.5

 
5.0

 
5.8

Overall income tax rate
17.0
%
 
13.3
%
 
(19.4
%)
 
(24.7
%)
 
34.0
%
 
33.1
%
 
Alliant Energy
 
IPL
 
WPL
Six Months Ended June 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
(11.9
)
 
(12.3
)
 
(32.8
)
 
(35.6
)
 
—

 
—

Production tax credits
(6.5
)
 
(7.7
)
 
(8.2
)
 
(10.1
)
 
(6.2
)
 
(7.0
)
Effect of rate-making on property-related differences
(5.1
)
 
(5.6
)
 
(13.0
)
 
(15.5
)
 
(0.7
)
 
(0.4
)
Other items, net
4.7

 
3.6

 
4.6

 
1.9

 
4.9

 
4.9

Overall income tax rate
16.2
%
 
13.0
%
 
(14.4
%)
 
(24.3
%)
 
33.0
%
 
32.5
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and six months ended June 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
 
Six Months
 
Tax Credit Generation
 
Capacity in MW
 
2014
 
2013
 
2014
 
2013
Cedar Ridge (WPL)
December 2018
 
68

 

$1.0

 

$1.1

 

$2.2

 

$2.3

Bent Tree - Phase I (WPL)
February 2021
 
201

 
3.2

 
3.5

 
7.4

 
7.0

Subtotal (WPL)
 
 
 
 
4.2

 
4.6

 
9.6

 
9.3

Whispering Willow - East (IPL)
December 2019
 
200

 
3.2

 
4.1

 
7.8

 
8.0

 
 
 
 
 

$7.4

 

$8.7

 

$17.4

 

$17.3
Summary Of Tax Credit Carryforwards
At June 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

$721

 

$248

 
2029
State net operating losses
747

 
38

 
2018
Federal tax credits
188

 
185

 
2022
 
 
 

$471

 
 

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

$317

 

$109

 
2029
State net operating losses
222

 
11

 
2018
Federal tax credits
62

 
61

 
2022
 
 
 

$181

 
 

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

$308

 

$106

 
2029
State net operating losses
114

 
6

 
2018
Federal tax credits
68

 
67

 
2022
 
 
 

$179

 
 
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 June 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
(11.9
)
 
(11.7
)
 
(36.6
)
 
(33.3
)
 
—

 
—

Production tax credits
(6.1
)
 
(7.9
)
 
(8.0
)
 
(10.5
)
 
(5.8
)
 
(7.2
)
Effect of rate-making on property-related differences
(4.8
)
 
(6.4
)
 
(14.4
)
 
(17.4
)
 
(0.2
)
 
(0.5
)
Other items, net
4.8

 
4.3

 
4.6

 
1.5

 
5.0

 
5.8

Overall income tax rate
17.0
%
 
13.3
%
 
(19.4
%)
 
(24.7
%)
 
34.0
%
 
33.1
%
 
Alliant Energy
 
IPL
 
WPL
Six Months Ended June 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
(11.9
)
 
(12.3
)
 
(32.8
)
 
(35.6
)
 
—

 
—

Production tax credits
(6.5
)
 
(7.7
)
 
(8.2
)
 
(10.1
)
 
(6.2
)
 
(7.0
)
Effect of rate-making on property-related differences
(5.1
)
 
(5.6
)
 
(13.0
)
 
(15.5
)
 
(0.7
)
 
(0.4
)
Other items, net
4.7

 
3.6

 
4.6

 
1.9

 
4.9

 
4.9

Overall income tax rate
16.2
%
 
13.0
%
 
(14.4
%)
 
(24.3
%)
 
33.0
%
 
32.5
%
Production Tax Credits (Net Of State Tax Impacts)
For the three and six months ended June 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
 
Six Months
 
Tax Credit Generation
 
Capacity in MW
 
2014
 
2013
 
2014
 
2013
Cedar Ridge (WPL)
December 2018
 
68

 

$1.0

 

$1.1

 

$2.2

 

$2.3

Bent Tree - Phase I (WPL)
February 2021
 
201

 
3.2

 
3.5

 
7.4

 
7.0

Subtotal (WPL)
 
 
 
 
4.2

 
4.6

 
9.6

 
9.3

Whispering Willow - East (IPL)
December 2019
 
200

 
3.2

 
4.1

 
7.8

 
8.0

 
 
 
 
 

$7.4

 

$8.7

 

$17.4

 

$17.3
Summary Of Tax Credit Carryforwards
At June 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

$721

 

$248

 
2029
State net operating losses
747

 
38

 
2018
Federal tax credits
188

 
185

 
2022
 
 
 

$471

 
 

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

$317

 

$109

 
2029
State net operating losses
222

 
11

 
2018
Federal tax credits
62

 
61

 
2022
 
 
 

$181

 
 

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

$308

 

$106

 
2029
State net operating losses
114

 
6

 
2018
Federal tax credits
68

 
67

 
2022
 
 
 

$179