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Derivative Instruments
 6 Months Ended
Jun. 30, 2012
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Alliant Energy, IPL and WPL periodically use derivative instruments for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 9 for detailed discussion of Alliant Energy’s, IPL’s and WPL’s derivative instruments as of June 30, 2012 and December 31, 2011.

Notional Amounts - As of June 30, 2012, notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2012
 
2013
 
2014
 
Total
Alliant Energy
 
 
 
 
 
 
 
Electricity (megawatt-hours (MWhs))
2,726

 
3,652

 
509

 
6,887

FTRs (MWs)
31

 
28

 
—

 
59

Natural gas (dekatherms (Dths))
33,281

 
21,089

 
5,200

 
59,570

IPL
 
 
 
 
 
 
 
Electricity (MWhs)
1,600

 
1,847

 
71

 
3,518

FTRs (MWs)
17

 
15

 
—

 
32

Natural gas (Dths)
22,703

 
10,937

 
2,025

 
35,665

WPL
 
 
 
 
 
 
 
Electricity (MWhs)
1,126

 
1,805

 
438

 
3,369

FTRs (MWs)
14

 
13

 
—

 
27

Natural gas (Dths)
10,578

 
10,152

 
3,175

 
23,905



The notional amounts in the above table were computed by aggregating the absolute value of purchase and sale positions within commodities for each delivery year.

Financial Statement Presentation - Alliant Energy, IPL and WPL record derivative instruments at fair value each reporting date on the balance sheet as assets or liabilities. At June 30, 2012 and December 31, 2011, the fair values of current derivative assets were included in “Derivative assets,” non-current derivative assets were included in “Deferred charges and other,” current derivative liabilities were included in “Derivative liabilities” and non-current derivative liabilities were included in “Other long-term liabilities and deferred credits” on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
June 30,
2012
 
December 31,
2011
 
June 30,
2012
 
December 31,
2011
 
June 30,
2012
 
December 31,
2011
Commodity contracts
 
 
 
 
 
Current derivative assets

$40.7

 

$12.7

 

$29.8

 

$9.2

 

$10.9

 

$3.5

Non-current derivative assets
3.7

 
3.0

 
1.7

 
1.4

 
2.0

 
1.6

Current derivative liabilities
48.4

 
55.9

 
23.2

 
24.5

 
25.2

 
31.4

Non-current derivative liabilities
16.9

 
22.1

 
6.1

 
9.1

 
10.8

 
13.0



Alliant Energy, IPL and WPL generally record gains and losses from IPL’s and WPL’s derivative instruments with offsets to regulatory assets or regulatory liabilities, based on their fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Three Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$7.7

 

($5.3
)
 

$5.0

 

($3.0
)
 

$2.7

 

($2.3
)
Regulatory liabilities
4.1

 
3.4

 
4.4

 
2.4

 
(0.3
)
 
1.0

Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets
(32.0
)
 
(9.3
)
 
(17.2
)
 
(5.4
)
 
(14.8
)
 
(3.9
)
Regulatory liabilities
5.5

 
4.9

 
4.4

 
3.2

 
1.1

 
1.7



Losses from commodity contracts during the six months ended June 30, 2012 were primarily due to impacts of decreases in electricity and natural gas prices during the first quarter of 2012.

Credit Risk-related Contingent Features - Alliant Energy, IPL and WPL have entered into various agreements that contain credit risk-related contingent features including requirements for them to maintain certain credit ratings from each of the major credit rating agencies and limitations on their liability positions under the various agreements based upon their credit ratings. In the event of a downgrade in their credit ratings or if their liability positions exceed certain contractual limits, Alliant Energy, IPL or WPL may need to provide credit support in the form of letters of credit or cash collateral up to the amount of their exposure under the contracts, or may need to unwind the contracts and pay the underlying liability positions.

Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. The aggregate fair value of all derivatives with credit risk-related contingent features that were in a net liability position on June 30, 2012 was $65.3 million, $29.3 million and $36.0 million for Alliant Energy, IPL and WPL, respectively. At June 30, 2012, Alliant Energy, IPL and WPL all had investment-grade credit ratings. If the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered on June 30, 2012, Alliant Energy, IPL and WPL would be required to post $65.3 million, $29.3 million and $36.0 million, respectively, of credit support to their counterparties.
IPL [Member]
  
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Alliant Energy, IPL and WPL periodically use derivative instruments for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 9 for detailed discussion of Alliant Energy’s, IPL’s and WPL’s derivative instruments as of June 30, 2012 and December 31, 2011.

Notional Amounts - As of June 30, 2012, notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2012
 
2013
 
2014
 
Total
Alliant Energy
 
 
 
 
 
 
 
Electricity (megawatt-hours (MWhs))
2,726

 
3,652

 
509

 
6,887

FTRs (MWs)
31

 
28

 
—

 
59

Natural gas (dekatherms (Dths))
33,281

 
21,089

 
5,200

 
59,570

IPL
 
 
 
 
 
 
 
Electricity (MWhs)
1,600

 
1,847

 
71

 
3,518

FTRs (MWs)
17

 
15

 
—

 
32

Natural gas (Dths)
22,703

 
10,937

 
2,025

 
35,665

WPL
 
 
 
 
 
 
 
Electricity (MWhs)
1,126

 
1,805

 
438

 
3,369

FTRs (MWs)
14

 
13

 
—

 
27

Natural gas (Dths)
10,578

 
10,152

 
3,175

 
23,905



The notional amounts in the above table were computed by aggregating the absolute value of purchase and sale positions within commodities for each delivery year.

Financial Statement Presentation - Alliant Energy, IPL and WPL record derivative instruments at fair value each reporting date on the balance sheet as assets or liabilities. At June 30, 2012 and December 31, 2011, the fair values of current derivative assets were included in “Derivative assets,” non-current derivative assets were included in “Deferred charges and other,” current derivative liabilities were included in “Derivative liabilities” and non-current derivative liabilities were included in “Other long-term liabilities and deferred credits” on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
June 30,
2012
 
December 31,
2011
 
June 30,
2012
 
December 31,
2011
 
June 30,
2012
 
December 31,
2011
Commodity contracts
 
 
 
 
 
Current derivative assets

$40.7

 

$12.7

 

$29.8

 

$9.2

 

$10.9

 

$3.5

Non-current derivative assets
3.7

 
3.0

 
1.7

 
1.4

 
2.0

 
1.6

Current derivative liabilities
48.4

 
55.9

 
23.2

 
24.5

 
25.2

 
31.4

Non-current derivative liabilities
16.9

 
22.1

 
6.1

 
9.1

 
10.8

 
13.0



Alliant Energy, IPL and WPL generally record gains and losses from IPL’s and WPL’s derivative instruments with offsets to regulatory assets or regulatory liabilities, based on their fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Three Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$7.7

 

($5.3
)
 

$5.0

 

($3.0
)
 

$2.7

 

($2.3
)
Regulatory liabilities
4.1

 
3.4

 
4.4

 
2.4

 
(0.3
)
 
1.0

Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets
(32.0
)
 
(9.3
)
 
(17.2
)
 
(5.4
)
 
(14.8
)
 
(3.9
)
Regulatory liabilities
5.5

 
4.9

 
4.4

 
3.2

 
1.1

 
1.7



Losses from commodity contracts during the six months ended June 30, 2012 were primarily due to impacts of decreases in electricity and natural gas prices during the first quarter of 2012.

Credit Risk-related Contingent Features - Alliant Energy, IPL and WPL have entered into various agreements that contain credit risk-related contingent features including requirements for them to maintain certain credit ratings from each of the major credit rating agencies and limitations on their liability positions under the various agreements based upon their credit ratings. In the event of a downgrade in their credit ratings or if their liability positions exceed certain contractual limits, Alliant Energy, IPL or WPL may need to provide credit support in the form of letters of credit or cash collateral up to the amount of their exposure under the contracts, or may need to unwind the contracts and pay the underlying liability positions.

Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. The aggregate fair value of all derivatives with credit risk-related contingent features that were in a net liability position on June 30, 2012 was $65.3 million, $29.3 million and $36.0 million for Alliant Energy, IPL and WPL, respectively. At June 30, 2012, Alliant Energy, IPL and WPL all had investment-grade credit ratings. If the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered on June 30, 2012, Alliant Energy, IPL and WPL would be required to post $65.3 million, $29.3 million and $36.0 million, respectively, of credit support to their counterparties.
WPL [Member]
  
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Alliant Energy, IPL and WPL periodically use derivative instruments for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 9 for detailed discussion of Alliant Energy’s, IPL’s and WPL’s derivative instruments as of June 30, 2012 and December 31, 2011.

Notional Amounts - As of June 30, 2012, notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts and FTRs that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2012
 
2013
 
2014
 
Total
Alliant Energy
 
 
 
 
 
 
 
Electricity (megawatt-hours (MWhs))
2,726

 
3,652

 
509

 
6,887

FTRs (MWs)
31

 
28

 
—

 
59

Natural gas (dekatherms (Dths))
33,281

 
21,089

 
5,200

 
59,570

IPL
 
 
 
 
 
 
 
Electricity (MWhs)
1,600

 
1,847

 
71

 
3,518

FTRs (MWs)
17

 
15

 
—

 
32

Natural gas (Dths)
22,703

 
10,937

 
2,025

 
35,665

WPL
 
 
 
 
 
 
 
Electricity (MWhs)
1,126

 
1,805

 
438

 
3,369

FTRs (MWs)
14

 
13

 
—

 
27

Natural gas (Dths)
10,578

 
10,152

 
3,175

 
23,905



The notional amounts in the above table were computed by aggregating the absolute value of purchase and sale positions within commodities for each delivery year.

Financial Statement Presentation - Alliant Energy, IPL and WPL record derivative instruments at fair value each reporting date on the balance sheet as assets or liabilities. At June 30, 2012 and December 31, 2011, the fair values of current derivative assets were included in “Derivative assets,” non-current derivative assets were included in “Deferred charges and other,” current derivative liabilities were included in “Derivative liabilities” and non-current derivative liabilities were included in “Other long-term liabilities and deferred credits” on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
June 30,
2012
 
December 31,
2011
 
June 30,
2012
 
December 31,
2011
 
June 30,
2012
 
December 31,
2011
Commodity contracts
 
 
 
 
 
Current derivative assets

$40.7

 

$12.7

 

$29.8

 

$9.2

 

$10.9

 

$3.5

Non-current derivative assets
3.7

 
3.0

 
1.7

 
1.4

 
2.0

 
1.6

Current derivative liabilities
48.4

 
55.9

 
23.2

 
24.5

 
25.2

 
31.4

Non-current derivative liabilities
16.9

 
22.1

 
6.1

 
9.1

 
10.8

 
13.0



Alliant Energy, IPL and WPL generally record gains and losses from IPL’s and WPL’s derivative instruments with offsets to regulatory assets or regulatory liabilities, based on their fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded on the Condensed Consolidated Balance Sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Three Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$7.7

 

($5.3
)
 

$5.0

 

($3.0
)
 

$2.7

 

($2.3
)
Regulatory liabilities
4.1

 
3.4

 
4.4

 
2.4

 
(0.3
)
 
1.0

Six Months Ended June 30
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets
(32.0
)
 
(9.3
)
 
(17.2
)
 
(5.4
)
 
(14.8
)
 
(3.9
)
Regulatory liabilities
5.5

 
4.9

 
4.4

 
3.2

 
1.1

 
1.7



Losses from commodity contracts during the six months ended June 30, 2012 were primarily due to impacts of decreases in electricity and natural gas prices during the first quarter of 2012.

Credit Risk-related Contingent Features - Alliant Energy, IPL and WPL have entered into various agreements that contain credit risk-related contingent features including requirements for them to maintain certain credit ratings from each of the major credit rating agencies and limitations on their liability positions under the various agreements based upon their credit ratings. In the event of a downgrade in their credit ratings or if their liability positions exceed certain contractual limits, Alliant Energy, IPL or WPL may need to provide credit support in the form of letters of credit or cash collateral up to the amount of their exposure under the contracts, or may need to unwind the contracts and pay the underlying liability positions.

Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. The aggregate fair value of all derivatives with credit risk-related contingent features that were in a net liability position on June 30, 2012 was $65.3 million, $29.3 million and $36.0 million for Alliant Energy, IPL and WPL, respectively. At June 30, 2012, Alliant Energy, IPL and WPL all had investment-grade credit ratings. If the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered on June 30, 2012, Alliant Energy, IPL and WPL would be required to post $65.3 million, $29.3 million and $36.0 million, respectively, of credit support to their counterparties.