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Commitments And Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2013
Long-term Purchase Commitment [Line Items] |
Operating Expense Purchase Obligations | At September 30, 2013, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Purchased power (a): |  |  |  |  |
DAEC (IPL) (b) |  | $1,698 |  |  |  | $1,698 |  |  |  | $— |
Kewaunee (WPL) | 18 |  |  | — |  |  | 18 |
Other (c) | 259 |  |  | 1 |  |  | 258 |
| 1,975 |  |  | 1,699 |  |  | 276 |
Natural gas | 336 |  |  | 203 |  |  | 133 |
Coal (d) | 328 |  |  | 151 |  |  | 177 |
SO2 emission allowances | 34 |  |  | 34 |  |  | — |
Other (e) | 19 |  |  | 9 |  |  | 6 |
|  | $2,692 |  |  |  | $2,096 |  |  |  | $592 |
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
(b) | Includes commitments incurred under an existing PPA that expires February 2014 and a new PPA completed in March 2013. The new PPA grants IPL rights to purchase 431 MWs of capacity and the resulting energy from DAEC for a term from the expiration of the existing PPA in February 2014 through December 31, 2025. If energy delivered under the new PPA is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s energy adjustment clause.
(c) | In June 2013, WPL entered into a new PPA for a term from January 1, 2014 through December 31, 2018.
(d) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2013 regarding expected future usage, which is subject to change.
(e) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2013.
IPL [Member] |
Long-term Purchase Commitment [Line Items] |
Operating Expense Purchase Obligations | At September 30, 2013, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Purchased power (a): |  |  |  |  |
DAEC (IPL) (b) |  | $1,698 |  |  |  | $1,698 |  |  |  | $— |
Kewaunee (WPL) | 18 |  |  | — |  |  | 18 |
Other (c) | 259 |  |  | 1 |  |  | 258 |
| 1,975 |  |  | 1,699 |  |  | 276 |
Natural gas | 336 |  |  | 203 |  |  | 133 |
Coal (d) | 328 |  |  | 151 |  |  | 177 |
SO2 emission allowances | 34 |  |  | 34 |  |  | — |
Other (e) | 19 |  |  | 9 |  |  | 6 |
|  | $2,692 |  |  |  | $2,096 |  |  |  | $592 |
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
(b) | Includes commitments incurred under an existing PPA that expires February 2014 and a new PPA completed in March 2013. The new PPA grants IPL rights to purchase 431 MWs of capacity and the resulting energy from DAEC for a term from the expiration of the existing PPA in February 2014 through December 31, 2025. If energy delivered under the new PPA is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s energy adjustment clause.
(c) | In June 2013, WPL entered into a new PPA for a term from January 1, 2014 through December 31, 2018.
(d) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2013 regarding expected future usage, which is subject to change.
(e) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2013.
WPL [Member] |
Long-term Purchase Commitment [Line Items] |
Operating Expense Purchase Obligations | At September 30, 2013, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Purchased power (a): |  |  |  |  |
DAEC (IPL) (b) |  | $1,698 |  |  |  | $1,698 |  |  |  | $— |
Kewaunee (WPL) | 18 |  |  | — |  |  | 18 |
Other (c) | 259 |  |  | 1 |  |  | 258 |
| 1,975 |  |  | 1,699 |  |  | 276 |
Natural gas | 336 |  |  | 203 |  |  | 133 |
Coal (d) | 328 |  |  | 151 |  |  | 177 |
SO2 emission allowances | 34 |  |  | 34 |  |  | — |
Other (e) | 19 |  |  | 9 |  |  | 6 |
|  | $2,692 |  |  |  | $2,096 |  |  |  | $592 |
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
(b) | Includes commitments incurred under an existing PPA that expires February 2014 and a new PPA completed in March 2013. The new PPA grants IPL rights to purchase 431 MWs of capacity and the resulting energy from DAEC for a term from the expiration of the existing PPA in February 2014 through December 31, 2025. If energy delivered under the new PPA is less than the targeted energy amount, an adjustment payment will be made to IPL, which will be reflected in IPL’s energy adjustment clause.
(c) | In June 2013, WPL entered into a new PPA for a term from January 1, 2014 through December 31, 2018.
(d) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of September 30, 2013 regarding expected future usage, which is subject to change.
(e) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2013.

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