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Derivative Instruments | 12 Months Ended
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Dec. 31, 2013
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 14 for detailed discussion of Alliant Energy’s, IPL’s and WPL’s derivative instruments as of December 31, 2013 and 2012. Notional Amounts - As of December 31, 2013, 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) | 5,895 |  |  | 2,717 |  |  | 1,318 |  |  | 1,314 |  |  | 1,314 |  |  | 12,558 |
FTRs (MWhs) | 7,707 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,707 |
Natural gas (Dths) | 47,669 |  |  | 8,956 |  |  | 1,639 |  |  | — |  |  | — |  |  | 58,264 |
Coal (tons) | 1,591 |  |  | 936 |  |  | 955 |  |  | 868 |  |  | 714 |  |  | 5,064 |
IPL |  |  |  |  |  |  |  |  |  |  |
Electricity (MWhs) | 2,159 |  |  | 527 |  |  | — |  |  | — |  |  | — |  |  | 2,686 |
FTRs (MWhs) | 4,923 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,923 |
Natural gas (Dths) | 37,535 |  |  | 7,381 |  |  | 1,639 |  |  | — |  |  | — |  |  | 46,555 |
Coal (tons) | 270 |  |  | — |  |  | 216 |  |  | 129 |  |  | 184 |  |  | 799 |
WPL |  |  |  |  |  |  |  |  |  |  |
Electricity (MWhs) | 3,736 |  |  | 2,190 |  |  | 1,318 |  |  | 1,314 |  |  | 1,314 |  |  | 9,872 |
FTRs (MWhs) | 2,784 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,784 |
Natural gas (Dths) | 10,134 |  |  | 1,575 |  |  | — |  |  | — |  |  | — |  |  | 11,709 |
Coal (tons) | 1,321 |  |  | 936 |  |  | 739 |  |  | 739 |  |  | 530 |  |  | 4,265 |
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 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 long-term liabilities and deferred credits” on the Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Commodity contracts | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Current derivative assets |  | $25.6 |  |  |  | $23.5 |  |  |  | $20.2 |  |  |  | $17.0 |  |  |  | $5.4 |  |  |  | $6.5 |
Non-current derivative assets | 1.1 |  |  | 2.7 |  |  | 0.9 |  |  | 0.5 |  |  | 0.2 |  |  | 2.2 |
Current derivative liabilities | 6.7 |  |  | 31.1 |  |  | 3.0 |  |  | 14.1 |  |  | 3.7 |  |  | 17.0 |
Non-current derivative liabilities | 14.1 |  |  | 9.3 |  |  | 2.2 |  |  | 2.0 |  |  | 11.9 |  |  | 7.3 |
Changes in unrealized gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded with offsets to regulatory assets or regulatory liabilities on the Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011
Regulatory assets |  | ($14.7 | ) |  |  | ($37.9 | ) |  |  | ($79.6 | ) |  |  | ($6.6 | ) |  |  | ($16.8 | ) |  |  | ($42.4 | ) |  |  | ($8.1 | ) |  |  | ($21.1 | ) |  |  | ($37.2 | )
Regulatory liabilities | 22.2 |  |  | 20.3 |  |  | 9.3 |  |  | 11.8 |  |  | 13.5 |  |  | 6.4 |  |  | 10.4 |  |  | 6.8 |  |  | 2.9 |
Net unrealized gains (losses) from commodity contracts during 2013, 2012 and 2011 were primarily due to changes in electricity and natural gas prices during such periods. 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/or 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 December 31, 2013 was $20.8 million, $5.2 million and $15.6 million for Alliant Energy, IPL and WPL, respectively. At December 31, 2013, 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 December 31, 2013, Alliant Energy, IPL and WPL would be required to post $20.8 million, $5.2 million and $15.6 million, respectively, of credit support to their counterparties. Balance Sheet Offsetting - Alliant Energy, IPL and WPL do not net the fair value amounts of derivative instruments subject to a master netting arrangement by counterparty on the Consolidated Balance Sheets. However, if Alliant Energy, IPL and WPL did net the fair value amounts of derivative instruments by counterparty, derivative assets and derivative liabilities related to commodity contracts would have been presented on their Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| Gross |  |  |  | Gross |  |  |  | Gross |  |
| (as reported) |  | Net |  | (as reported) |  | Net |  | (as reported) |  | Net
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 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Derivative assets | 26.2 |  |  | 19.3 |  |  | 17.5 |  |  | 14.5 |  |  | 8.7 |  |  | 4.8 |
Derivative liabilities | 40.4 |  |  | 33.5 |  |  | 16.1 |  |  | 13.1 |  |  | 24.3 |  |  | 20.4 |
Alliant Energy, IPL and WPL also do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. In addition, trade receivables and payables associated with derivative assets and derivative liabilities are also subject to a master netting arrangement. As of December 31, 2013 and 2012, the related cash collateral and trade receivables and payables were not material and were not included in the above table.
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 14 for detailed discussion of Alliant Energy’s, IPL’s and WPL’s derivative instruments as of December 31, 2013 and 2012. Notional Amounts - As of December 31, 2013, 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) | 5,895 |  |  | 2,717 |  |  | 1,318 |  |  | 1,314 |  |  | 1,314 |  |  | 12,558 |
FTRs (MWhs) | 7,707 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,707 |
Natural gas (Dths) | 47,669 |  |  | 8,956 |  |  | 1,639 |  |  | — |  |  | — |  |  | 58,264 |
Coal (tons) | 1,591 |  |  | 936 |  |  | 955 |  |  | 868 |  |  | 714 |  |  | 5,064 |
IPL |  |  |  |  |  |  |  |  |  |  |
Electricity (MWhs) | 2,159 |  |  | 527 |  |  | — |  |  | — |  |  | — |  |  | 2,686 |
FTRs (MWhs) | 4,923 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,923 |
Natural gas (Dths) | 37,535 |  |  | 7,381 |  |  | 1,639 |  |  | — |  |  | — |  |  | 46,555 |
Coal (tons) | 270 |  |  | — |  |  | 216 |  |  | 129 |  |  | 184 |  |  | 799 |
WPL |  |  |  |  |  |  |  |  |  |  |
Electricity (MWhs) | 3,736 |  |  | 2,190 |  |  | 1,318 |  |  | 1,314 |  |  | 1,314 |  |  | 9,872 |
FTRs (MWhs) | 2,784 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,784 |
Natural gas (Dths) | 10,134 |  |  | 1,575 |  |  | — |  |  | — |  |  | — |  |  | 11,709 |
Coal (tons) | 1,321 |  |  | 936 |  |  | 739 |  |  | 739 |  |  | 530 |  |  | 4,265 |
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 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 long-term liabilities and deferred credits” on the Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Commodity contracts | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Current derivative assets |  | $25.6 |  |  |  | $23.5 |  |  |  | $20.2 |  |  |  | $17.0 |  |  |  | $5.4 |  |  |  | $6.5 |
Non-current derivative assets | 1.1 |  |  | 2.7 |  |  | 0.9 |  |  | 0.5 |  |  | 0.2 |  |  | 2.2 |
Current derivative liabilities | 6.7 |  |  | 31.1 |  |  | 3.0 |  |  | 14.1 |  |  | 3.7 |  |  | 17.0 |
Non-current derivative liabilities | 14.1 |  |  | 9.3 |  |  | 2.2 |  |  | 2.0 |  |  | 11.9 |  |  | 7.3 |
Changes in unrealized gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded with offsets to regulatory assets or regulatory liabilities on the Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011
Regulatory assets |  | ($14.7 | ) |  |  | ($37.9 | ) |  |  | ($79.6 | ) |  |  | ($6.6 | ) |  |  | ($16.8 | ) |  |  | ($42.4 | ) |  |  | ($8.1 | ) |  |  | ($21.1 | ) |  |  | ($37.2 | )
Regulatory liabilities | 22.2 |  |  | 20.3 |  |  | 9.3 |  |  | 11.8 |  |  | 13.5 |  |  | 6.4 |  |  | 10.4 |  |  | 6.8 |  |  | 2.9 |
Net unrealized gains (losses) from commodity contracts during 2013, 2012 and 2011 were primarily due to changes in electricity and natural gas prices during such periods. 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/or 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 December 31, 2013 was $20.8 million, $5.2 million and $15.6 million for Alliant Energy, IPL and WPL, respectively. At December 31, 2013, 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 December 31, 2013, Alliant Energy, IPL and WPL would be required to post $20.8 million, $5.2 million and $15.6 million, respectively, of credit support to their counterparties. Balance Sheet Offsetting - Alliant Energy, IPL and WPL do not net the fair value amounts of derivative instruments subject to a master netting arrangement by counterparty on the Consolidated Balance Sheets. However, if Alliant Energy, IPL and WPL did net the fair value amounts of derivative instruments by counterparty, derivative assets and derivative liabilities related to commodity contracts would have been presented on their Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| Gross |  |  |  | Gross |  |  |  | Gross |  |
| (as reported) |  | Net |  | (as reported) |  | Net |  | (as reported) |  | Net
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 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Derivative assets | 26.2 |  |  | 19.3 |  |  | 17.5 |  |  | 14.5 |  |  | 8.7 |  |  | 4.8 |
Derivative liabilities | 40.4 |  |  | 33.5 |  |  | 16.1 |  |  | 13.1 |  |  | 24.3 |  |  | 20.4 |
Alliant Energy, IPL and WPL also do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. In addition, trade receivables and payables associated with derivative assets and derivative liabilities are also subject to a master netting arrangement. As of December 31, 2013 and 2012, the related cash collateral and trade receivables and payables were not material and were not included in the above table.
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 14 for detailed discussion of Alliant Energy’s, IPL’s and WPL’s derivative instruments as of December 31, 2013 and 2012. Notional Amounts - As of December 31, 2013, 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) | 5,895 |  |  | 2,717 |  |  | 1,318 |  |  | 1,314 |  |  | 1,314 |  |  | 12,558 |
FTRs (MWhs) | 7,707 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,707 |
Natural gas (Dths) | 47,669 |  |  | 8,956 |  |  | 1,639 |  |  | — |  |  | — |  |  | 58,264 |
Coal (tons) | 1,591 |  |  | 936 |  |  | 955 |  |  | 868 |  |  | 714 |  |  | 5,064 |
IPL |  |  |  |  |  |  |  |  |  |  |
Electricity (MWhs) | 2,159 |  |  | 527 |  |  | — |  |  | — |  |  | — |  |  | 2,686 |
FTRs (MWhs) | 4,923 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,923 |
Natural gas (Dths) | 37,535 |  |  | 7,381 |  |  | 1,639 |  |  | — |  |  | — |  |  | 46,555 |
Coal (tons) | 270 |  |  | — |  |  | 216 |  |  | 129 |  |  | 184 |  |  | 799 |
WPL |  |  |  |  |  |  |  |  |  |  |
Electricity (MWhs) | 3,736 |  |  | 2,190 |  |  | 1,318 |  |  | 1,314 |  |  | 1,314 |  |  | 9,872 |
FTRs (MWhs) | 2,784 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,784 |
Natural gas (Dths) | 10,134 |  |  | 1,575 |  |  | — |  |  | — |  |  | — |  |  | 11,709 |
Coal (tons) | 1,321 |  |  | 936 |  |  | 739 |  |  | 739 |  |  | 530 |  |  | 4,265 |
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 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 long-term liabilities and deferred credits” on the Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Commodity contracts | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012
Current derivative assets |  | $25.6 |  |  |  | $23.5 |  |  |  | $20.2 |  |  |  | $17.0 |  |  |  | $5.4 |  |  |  | $6.5 |
Non-current derivative assets | 1.1 |  |  | 2.7 |  |  | 0.9 |  |  | 0.5 |  |  | 0.2 |  |  | 2.2 |
Current derivative liabilities | 6.7 |  |  | 31.1 |  |  | 3.0 |  |  | 14.1 |  |  | 3.7 |  |  | 17.0 |
Non-current derivative liabilities | 14.1 |  |  | 9.3 |  |  | 2.2 |  |  | 2.0 |  |  | 11.9 |  |  | 7.3 |
Changes in unrealized gains (losses) from commodity derivative instruments not designated as hedging instruments were recorded with offsets to regulatory assets or regulatory liabilities on the Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011 |  | 2013 |  | 2012 |  | 2011
Regulatory assets |  | ($14.7 | ) |  |  | ($37.9 | ) |  |  | ($79.6 | ) |  |  | ($6.6 | ) |  |  | ($16.8 | ) |  |  | ($42.4 | ) |  |  | ($8.1 | ) |  |  | ($21.1 | ) |  |  | ($37.2 | )
Regulatory liabilities | 22.2 |  |  | 20.3 |  |  | 9.3 |  |  | 11.8 |  |  | 13.5 |  |  | 6.4 |  |  | 10.4 |  |  | 6.8 |  |  | 2.9 |
Net unrealized gains (losses) from commodity contracts during 2013, 2012 and 2011 were primarily due to changes in electricity and natural gas prices during such periods. 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/or 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 December 31, 2013 was $20.8 million, $5.2 million and $15.6 million for Alliant Energy, IPL and WPL, respectively. At December 31, 2013, 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 December 31, 2013, Alliant Energy, IPL and WPL would be required to post $20.8 million, $5.2 million and $15.6 million, respectively, of credit support to their counterparties. Balance Sheet Offsetting - Alliant Energy, IPL and WPL do not net the fair value amounts of derivative instruments subject to a master netting arrangement by counterparty on the Consolidated Balance Sheets. However, if Alliant Energy, IPL and WPL did net the fair value amounts of derivative instruments by counterparty, derivative assets and derivative liabilities related to commodity contracts would have been presented on their Consolidated Balance Sheets as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
| Gross |  |  |  | Gross |  |  |  | Gross |  |
| (as reported) |  | Net |  | (as reported) |  | Net |  | (as reported) |  | Net
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 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Derivative assets | 26.2 |  |  | 19.3 |  |  | 17.5 |  |  | 14.5 |  |  | 8.7 |  |  | 4.8 |
Derivative liabilities | 40.4 |  |  | 33.5 |  |  | 16.1 |  |  | 13.1 |  |  | 24.3 |  |  | 20.4 |
Alliant Energy, IPL and WPL also do not offset fair value amounts recognized for the right to reclaim cash collateral (receivable) or the obligation to return cash collateral (payable) against fair value amounts recognized for derivative instruments executed with the same counterparty under the same master netting arrangement. In addition, trade receivables and payables associated with derivative assets and derivative liabilities are also subject to a master netting arrangement. As of December 31, 2013 and 2012, the related cash collateral and trade receivables and payables were not material and were not included in the above table.

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