Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2013

Derivative [Line Items]

Notional Amounts of Derivative Instruments

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

Fair Value of Financial Instruments

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

Gains and Losses from Derivative Instruments Not Designated as Hedging Instruments

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

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

IPL [Member]

Derivative [Line Items]

Notional Amounts of Derivative Instruments

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

Fair Value of Financial Instruments

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

Gains and Losses from Derivative Instruments Not Designated as Hedging Instruments

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

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

WPL [Member]

Derivative [Line Items]

Notional Amounts of Derivative Instruments

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

Fair Value of Financial Instruments

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

Gains and Losses from Derivative Instruments Not Designated as Hedging Instruments

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

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