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Derivative Instruments
 12 Months Ended
Dec. 31, 2016
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 14 for detailed discussion of derivative instruments.

Notional Amounts - As of December 31, 2016, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts, FTRs, coal contracts and diesel fuel contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
Electricity
 
FTRs
 
Natural Gas
 
Coal
 
Diesel Fuel
 
MWhs
 
Years
 
MWhs
 
Years
 
Dths
 
Years
 
Tons
 
Years
 
Gallons
 
Years
Alliant Energy
2,628

 
2017-2018
 
8,970

 
2017
 
139,865

 
2017-2023
 
4,239

 
2017-2019
 
6,552

 
2017-2018
IPL
—

 
—
 
5,465

 
2017
 
56,265

 
2017-2021
 
1,955

 
2017-2019
 
—

 
—
WPL
2,628

 
2017-2018
 
3,505

 
2017
 
83,600

 
2017-2023
 
2,284

 
2017-2018
 
6,552

 
2017-2018

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. At December 31, 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 liabilities” on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Current derivative assets

$29.4

 

$15.1

 

$19.1

 

$13.8

 

$10.3

 

$1.3

Non-current derivative assets
12.0

 
3.3

 
1.7

 
1.7

 
10.3

 
1.6

Current derivative liabilities
13.3

 
47.3

 
2.7

 
18.5

 
10.6

 
28.8

Non-current derivative liabilities
15.3

 
17.3

 
5.6

 
4.9

 
9.7

 
12.4



Unrealized gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. Refer to Note 2 for further discussion.

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. At December 31, 2016 and 2015, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than 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.

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, amounts would not be materially different from gross amounts of derivative assets and derivative liabilities at December 31, 2016 and 2015. 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.
IPL [Member]  
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 14 for detailed discussion of derivative instruments.

Notional Amounts - As of December 31, 2016, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts, FTRs, coal contracts and diesel fuel contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
Electricity
 
FTRs
 
Natural Gas
 
Coal
 
Diesel Fuel
 
MWhs
 
Years
 
MWhs
 
Years
 
Dths
 
Years
 
Tons
 
Years
 
Gallons
 
Years
Alliant Energy
2,628

 
2017-2018
 
8,970

 
2017
 
139,865

 
2017-2023
 
4,239

 
2017-2019
 
6,552

 
2017-2018
IPL
—

 
—
 
5,465

 
2017
 
56,265

 
2017-2021
 
1,955

 
2017-2019
 
—

 
—
WPL
2,628

 
2017-2018
 
3,505

 
2017
 
83,600

 
2017-2023
 
2,284

 
2017-2018
 
6,552

 
2017-2018

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. At December 31, 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 liabilities” on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Current derivative assets

$29.4

 

$15.1

 

$19.1

 

$13.8

 

$10.3

 

$1.3

Non-current derivative assets
12.0

 
3.3

 
1.7

 
1.7

 
10.3

 
1.6

Current derivative liabilities
13.3

 
47.3

 
2.7

 
18.5

 
10.6

 
28.8

Non-current derivative liabilities
15.3

 
17.3

 
5.6

 
4.9

 
9.7

 
12.4



Unrealized gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. Refer to Note 2 for further discussion.

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. At December 31, 2016 and 2015, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than 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.

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, amounts would not be materially different from gross amounts of derivative assets and derivative liabilities at December 31, 2016 and 2015. 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.
WPL [Member]  
Derivative [Line Items]  
Derivative Instruments
DERIVATIVE INSTRUMENTS
Commodity Derivatives -
Purpose - Derivative instruments are used for risk management purposes to mitigate exposures to fluctuations in certain commodity prices and transmission congestion costs. Refer to Note 14 for detailed discussion of derivative instruments.

Notional Amounts - As of December 31, 2016, gross notional amounts and settlement/delivery years related to outstanding swap contracts, option contracts, physical forward contracts, FTRs, coal contracts and diesel fuel contracts that were accounted for as commodity derivative instruments were as follows (units in thousands):
 
Electricity
 
FTRs
 
Natural Gas
 
Coal
 
Diesel Fuel
 
MWhs
 
Years
 
MWhs
 
Years
 
Dths
 
Years
 
Tons
 
Years
 
Gallons
 
Years
Alliant Energy
2,628

 
2017-2018
 
8,970

 
2017
 
139,865

 
2017-2023
 
4,239

 
2017-2019
 
6,552

 
2017-2018
IPL
—

 
—
 
5,465

 
2017
 
56,265

 
2017-2021
 
1,955

 
2017-2019
 
—

 
—
WPL
2,628

 
2017-2018
 
3,505

 
2017
 
83,600

 
2017-2023
 
2,284

 
2017-2018
 
6,552

 
2017-2018

Financial Statement Presentation - Derivative instruments are recorded at fair value each reporting date on the balance sheet as assets or liabilities. At December 31, 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 liabilities” on the balance sheets as follows (in millions):
 
Alliant Energy
 
IPL
 
WPL
Commodity contracts
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Current derivative assets

$29.4

 

$15.1

 

$19.1

 

$13.8

 

$10.3

 

$1.3

Non-current derivative assets
12.0

 
3.3

 
1.7

 
1.7

 
10.3

 
1.6

Current derivative liabilities
13.3

 
47.3

 
2.7

 
18.5

 
10.6

 
28.8

Non-current derivative liabilities
15.3

 
17.3

 
5.6

 
4.9

 
9.7

 
12.4



Unrealized gains and losses from derivative instruments are generally recorded with offsets to regulatory assets or regulatory liabilities, based on fuel and natural gas cost recovery mechanisms, as well as other specific regulatory authorizations. Based on these recovery mechanisms, the changes in the fair value of derivative liabilities resulted in comparable changes to regulatory assets, and the changes in the fair value of derivative assets resulted in comparable changes to regulatory liabilities. Refer to Note 2 for further discussion.

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. At December 31, 2016 and 2015, the aggregate fair value of all derivative instruments with credit risk-related contingent features in a net liability position was not materially different than 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.

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, amounts would not be materially different from gross amounts of derivative assets and derivative liabilities at December 31, 2016 and 2015. 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.