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Derivative Instruments
 3 Months Ended
Mar. 31, 2014
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 11 for detailed discussion of derivative instruments.

Notional Amounts - As of March 31, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2014
 
2015
 
2016
 
2017
 
2018
 
Total
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
4,895

 
2,912

 
1,318

 
1,314

 
1,314

 
11,753

FTRs (MWhs)
3,037

 
—

 
—

 
—

 
—

 
3,037

Natural gas (Dths)
29,496

 
10,842

 
2,959

 
—

 
—

 
43,297

Coal (tons)
1,194

 
936

 
955

 
868

 
714

 
4,667

IPL
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,955

 
722

 
—

 
—

 
—

 
2,677

FTRs (MWhs)
1,963

 
—

 
—

 
—

 
—

 
1,963

Natural gas (Dths)
20,185

 
8,815

 
2,504

 
—

 
—

 
31,504

Coal (tons)
203

 
—

 
216

 
129

 
184

 
732

WPL
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
2,940

 
2,190

 
1,318

 
1,314

 
1,314

 
9,076

FTRs (MWhs)
1,074

 
—

 
—

 
—

 
—

 
1,074

Natural gas (Dths)
9,311

 
2,027

 
455

 
—

 
—

 
11,793

Coal (tons)
991

 
936

 
739

 
739

 
530

 
3,935



Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
March 31,
2014
 
December 31,
2013
 
March 31,
2014
 
December 31,
2013
 
March 31,
2014
 
December 31,
2013
Current derivative assets

$31.5

 

$25.6

 

$15.4

 

$20.2

 

$16.1

 

$5.4

Non-current derivative assets
9.8

 
1.1

 
0.5

 
0.9

 
9.3

 
0.2

Current derivative liabilities
4.2

 
6.7

 
1.1

 
3.0

 
3.1

 
3.7

Non-current derivative liabilities
4.8

 
14.1

 
1.1

 
2.2

 
3.7

 
11.9



Changes in unrealized gains from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Three Months Ended March 31
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$10.1

 

$9.5

 

$5.5

 

$2.7

 

$4.6

 

$6.8

Regulatory liabilities
48.1

 
16.4

 
12.1

 
8.8

 
36.0

 
7.6



Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions):
 
March 31, 2014
 
December 31, 2013
 
Alliant Energy
 
IPL
 
WPL
 
Alliant Energy
 
IPL
 
WPL
Aggregate fair value

$9.0

 

$2.2

 

$6.8

 

$20.8

 

$5.2

 

$15.6

Credit support to be posted if triggered
9.0

 
2.2

 
6.8

 
20.8

 
5.2

 
15.6



Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Gross
 
 
 
Gross
 
 
 
Gross
 
 
 
(as reported)
 
Net
 
(as reported)
 
Net
 
(as reported)
 
Net
March 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Derivative assets

$41.3

 

$32.3

 

$15.9

 

$9.7

 

$25.4

 

$22.6

Derivative liabilities
9.0

 
4.9

 
2.2

 
0.9

 
6.8

 
4.0

December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
26.7

 
23.5

 
21.1

 
19.5

 
5.6

 
4.0

Derivative liabilities
20.8

 
17.6

 
5.2

 
3.6

 
15.6

 
14.0



Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. As of March 31, 2014, both Alliant Energy’s and IPL’s net derivative assets in the above table exclude $4.9 million of cash collateral posted by one counterparty.

In addition, trade receivables and payables associated with derivative assets and derivative liabilities are also subject to a master netting arrangement. At March 31, 2014 and December 31, 2013, the related cash collateral and trade payables and receivables were not material and were not included in the above table.
IPL [Member]
  
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 11 for detailed discussion of derivative instruments.

Notional Amounts - As of March 31, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2014
 
2015
 
2016
 
2017
 
2018
 
Total
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
4,895

 
2,912

 
1,318

 
1,314

 
1,314

 
11,753

FTRs (MWhs)
3,037

 
—

 
—

 
—

 
—

 
3,037

Natural gas (Dths)
29,496

 
10,842

 
2,959

 
—

 
—

 
43,297

Coal (tons)
1,194

 
936

 
955

 
868

 
714

 
4,667

IPL
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,955

 
722

 
—

 
—

 
—

 
2,677

FTRs (MWhs)
1,963

 
—

 
—

 
—

 
—

 
1,963

Natural gas (Dths)
20,185

 
8,815

 
2,504

 
—

 
—

 
31,504

Coal (tons)
203

 
—

 
216

 
129

 
184

 
732

WPL
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
2,940

 
2,190

 
1,318

 
1,314

 
1,314

 
9,076

FTRs (MWhs)
1,074

 
—

 
—

 
—

 
—

 
1,074

Natural gas (Dths)
9,311

 
2,027

 
455

 
—

 
—

 
11,793

Coal (tons)
991

 
936

 
739

 
739

 
530

 
3,935



Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
March 31,
2014
 
December 31,
2013
 
March 31,
2014
 
December 31,
2013
 
March 31,
2014
 
December 31,
2013
Current derivative assets

$31.5

 

$25.6

 

$15.4

 

$20.2

 

$16.1

 

$5.4

Non-current derivative assets
9.8

 
1.1

 
0.5

 
0.9

 
9.3

 
0.2

Current derivative liabilities
4.2

 
6.7

 
1.1

 
3.0

 
3.1

 
3.7

Non-current derivative liabilities
4.8

 
14.1

 
1.1

 
2.2

 
3.7

 
11.9



Changes in unrealized gains from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Three Months Ended March 31
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$10.1

 

$9.5

 

$5.5

 

$2.7

 

$4.6

 

$6.8

Regulatory liabilities
48.1

 
16.4

 
12.1

 
8.8

 
36.0

 
7.6



Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions):
 
March 31, 2014
 
December 31, 2013
 
Alliant Energy
 
IPL
 
WPL
 
Alliant Energy
 
IPL
 
WPL
Aggregate fair value

$9.0

 

$2.2

 

$6.8

 

$20.8

 

$5.2

 

$15.6

Credit support to be posted if triggered
9.0

 
2.2

 
6.8

 
20.8

 
5.2

 
15.6



Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Gross
 
 
 
Gross
 
 
 
Gross
 
 
 
(as reported)
 
Net
 
(as reported)
 
Net
 
(as reported)
 
Net
March 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Derivative assets

$41.3

 

$32.3

 

$15.9

 

$9.7

 

$25.4

 

$22.6

Derivative liabilities
9.0

 
4.9

 
2.2

 
0.9

 
6.8

 
4.0

December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
26.7

 
23.5

 
21.1

 
19.5

 
5.6

 
4.0

Derivative liabilities
20.8

 
17.6

 
5.2

 
3.6

 
15.6

 
14.0



Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. As of March 31, 2014, both Alliant Energy’s and IPL’s net derivative assets in the above table exclude $4.9 million of cash collateral posted by one counterparty.

In addition, trade receivables and payables associated with derivative assets and derivative liabilities are also subject to a master netting arrangement. At March 31, 2014 and December 31, 2013, the related cash collateral and trade payables and receivables were not material and were not included in the above table.
WPL [Member]
  
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are periodically used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 11 for detailed discussion of derivative instruments.

Notional Amounts - As of March 31, 2014, gross notional amounts by delivery year related to outstanding swap contracts, option contracts, physical forward contracts, FTRs and coal contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
2014
 
2015
 
2016
 
2017
 
2018
 
Total
Alliant Energy
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
4,895

 
2,912

 
1,318

 
1,314

 
1,314

 
11,753

FTRs (MWhs)
3,037

 
—

 
—

 
—

 
—

 
3,037

Natural gas (Dths)
29,496

 
10,842

 
2,959

 
—

 
—

 
43,297

Coal (tons)
1,194

 
936

 
955

 
868

 
714

 
4,667

IPL
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
1,955

 
722

 
—

 
—

 
—

 
2,677

FTRs (MWhs)
1,963

 
—

 
—

 
—

 
—

 
1,963

Natural gas (Dths)
20,185

 
8,815

 
2,504

 
—

 
—

 
31,504

Coal (tons)
203

 
—

 
216

 
129

 
184

 
732

WPL
 
 
 
 
 
 
 
 
 
 
 
Electricity (MWhs)
2,940

 
2,190

 
1,318

 
1,314

 
1,314

 
9,076

FTRs (MWhs)
1,074

 
—

 
—

 
—

 
—

 
1,074

Natural gas (Dths)
9,311

 
2,027

 
455

 
—

 
—

 
11,793

Coal (tons)
991

 
936

 
739

 
739

 
530

 
3,935



Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. The fair values of current derivative assets are included in “Other current assets,” non-current derivative assets are included in “Deferred charges and other,” current derivative liabilities are included in “Other current liabilities” and non-current derivative liabilities are included in “Other long-term liabilities and deferred credits” on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
March 31,
2014
 
December 31,
2013
 
March 31,
2014
 
December 31,
2013
 
March 31,
2014
 
December 31,
2013
Current derivative assets

$31.5

 

$25.6

 

$15.4

 

$20.2

 

$16.1

 

$5.4

Non-current derivative assets
9.8

 
1.1

 
0.5

 
0.9

 
9.3

 
0.2

Current derivative liabilities
4.2

 
6.7

 
1.1

 
3.0

 
3.1

 
3.7

Non-current derivative liabilities
4.8

 
14.1

 
1.1

 
2.2

 
3.7

 
11.9



Changes in unrealized gains from commodity derivative instruments were recorded with offsets to regulatory assets or regulatory liabilities on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Three Months Ended March 31
 
 
 
 
 
 
 
 
 
 
 
Regulatory assets

$10.1

 

$9.5

 

$5.5

 

$2.7

 

$4.6

 

$6.8

Regulatory liabilities
48.1

 
16.4

 
12.1

 
8.8

 
36.0

 
7.6



Credit Risk-related Contingent Features - Various agreements contain credit risk-related contingent features, including requirements to maintain certain credit ratings and/or limitations on liability positions under the agreements based on credit ratings. Certain of these agreements with credit risk-related contingency features are accounted for as derivative instruments. In the event of a material change in creditworthiness or if liability positions exceed certain contractual limits, credit support may need to be provided in the form of letters of credit or cash collateral up to the amount of exposure under the contracts, or the contracts may need to be unwound and underlying liability positions paid. The aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position, as well as amounts that would be required to be posted as credit support to counterparties by Alliant Energy, IPL or WPL if the most restrictive credit risk-related contingent features for derivative agreements in a net liability position were triggered, were as follows (in millions):
 
March 31, 2014
 
December 31, 2013
 
Alliant Energy
 
IPL
 
WPL
 
Alliant Energy
 
IPL
 
WPL
Aggregate fair value

$9.0

 

$2.2

 

$6.8

 

$20.8

 

$5.2

 

$15.6

Credit support to be posted if triggered
9.0

 
2.2

 
6.8

 
20.8

 
5.2

 
15.6



Balance Sheet Offsetting - The fair value amounts of derivative instruments subject to a master netting arrangement are not netted by counterparty on the balance sheets. However, if the fair value amounts of derivative instruments by counterparty were netted, derivative assets and derivative liabilities related to commodity contracts would have been presented on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
 
Gross
 
 
 
Gross
 
 
 
Gross
 
 
 
(as reported)
 
Net
 
(as reported)
 
Net
 
(as reported)
 
Net
March 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Derivative assets

$41.3

 

$32.3

 

$15.9

 

$9.7

 

$25.4

 

$22.6

Derivative liabilities
9.0

 
4.9

 
2.2

 
0.9

 
6.8

 
4.0

December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Derivative assets
26.7

 
23.5

 
21.1

 
19.5

 
5.6

 
4.0

Derivative liabilities
20.8

 
17.6

 
5.2

 
3.6

 
15.6

 
14.0



Fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) are not offset against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. As of March 31, 2014, both Alliant Energy’s and IPL’s net derivative assets in the above table exclude $4.9 million of cash collateral posted by one counterparty.

In addition, trade receivables and payables associated with derivative assets and derivative liabilities are also subject to a master netting arrangement. At March 31, 2014 and December 31, 2013, the related cash collateral and trade payables and receivables were not material and were not included in the above table.