Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Carrying Amount and Fair Value Of Financial Instruments

Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions):

	Alliant Energy				IPL				WPL
June 30, 2014	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Derivative assets (Note 13)		$119.0		$119.0		$73.0		$73.0		$46.0		$46.0
Deferred proceeds (sales of receivables) (Note 4(a))	193.7		193.7		193.7		193.7		—		—
Capitalization and liabilities:
Long-term debt (including current maturities) (Note 8(b))	3,338.9		3,907.4		1,558.7		1,821.3		1,332.3		1,627.1
Cumulative preferred stock (Note 7)	200.0		199.2		200.0		199.2		—		—
Derivative liabilities (Note 13)	13.3		13.3		6.3		6.3		7.0		7.0

	Alliant Energy				IPL				WPL
December 31, 2013	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Derivative assets (Note 13)		$26.7		$26.7		$21.1		$21.1		$5.6		$5.6
Deferred proceeds (sales of receivables) (Note 4(a))	203.5		203.5		203.5		203.5		—		—
Capitalization and liabilities:
Long-term debt (including current maturities) (Note 8(b))	3,336.3		3,712.3		1,558.4		1,726.4		1,332.1		1,532.9
Cumulative preferred stock (Note 7)	200.0		167.0		200.0		167.0		—		—
Derivative liabilities (Note 13)	20.8		20.8		5.2		5.2		15.6		15.6

Fair Value Measurements

Items subject to fair value measurement disclosure requirements were as follows (in millions):

Alliant Energy	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$119.0		$—		$10.6		$108.4		$26.7		$—		$4.7		$22.0
Deferred proceeds	193.7		—		—		193.7		203.5		—		—		203.5
Capitalization and liabilities:
Long-term debt (including current maturities)	3,907.4		—		3,904.1		3.3		3,712.3		—		3,711.8		0.5
Cumulative preferred stock	199.2		199.2		—		—		167.0		167.0		—		—
Derivatives - commodity contracts	13.3		—		6.1		7.2		20.8		—		3.2		17.6

IPL	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$73.0		$—		$6.7		$66.3		$21.1		$—		$3.0		$18.1
Deferred proceeds	193.7		—		—		193.7		203.5		—		—		203.5
Capitalization and liabilities:
Long-term debt (including current maturities)	1,821.3		—		1,821.3		—		1,726.4		—		1,726.4		—
Cumulative preferred stock	199.2		199.2		—		—		167.0		167.0		—		—
Derivatives - commodity contracts	6.3		—		4.2		2.1		5.2		—		1.7		3.5

WPL	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$46.0		$—		$3.9		$42.1		$5.6		$—		$1.7		$3.9
Capitalization and liabilities:
Long-term debt (including current maturities)	1,627.1		—		1,627.1		—		1,532.9		—		1,532.9		—
Derivatives - commodity contracts	7.0		—		1.9		5.1		15.6		—		1.5		14.1

Fair Value Measurements Using Significant Unobservable Inputs

Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):

Alliant Energy	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Three Months Ended June 30	2014			2013			2014		2013
Beginning balance, April 1		$23.9			$4.9			$170.8		$122.1
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	16.9			(1.2		)	—		—
Purchases	76.7			50.9			—		—
Settlements (b)	(16.3		)	(12.1		)	22.9		(52.8		)
Ending balance, June 30		$101.2			$42.5			$193.7		$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$16.3			($1.2	)		$—		$—

Alliant Energy	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Six Months Ended June 30	2014			2013			2014			2013
Beginning balance, January 1		$4.4			$11.9			$203.5			$66.8
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	54.7			(3.0		)	—			—
Transfers out of Level 3 (c)	—			3.6			—			—
Purchases	76.7			50.9			—			—
Settlements (b)	(34.6		)	(20.9		)	(9.8		)	2.5
Ending balance, June 30		$101.2			$42.5			$193.7			$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$46.0			($3.0	)		$—			$—

IPL	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Three Months Ended June 30	2014			2013			2014		2013
Beginning balance, April 1		$7.8			$4.3			$170.8		$122.1
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	0.6			(0.1		)	—		—
Purchases	68.8			46.1			—		—
Settlements (b)	(13.0		)	(9.7		)	22.9		(52.8		)
Ending balance, June 30		$64.2			$40.6			$193.7		$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$0.7			($0.1	)		$—		$—

IPL	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Six Months Ended June 30	2014			2013			2014			2013
Beginning balance, January 1		$14.6			$12.5			$203.5			$66.8
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	4.4			(3.0		)	—			—
Transfers out of Level 3 (c)	—			1.1			—			—
Purchases	68.8			46.1			—			—
Settlements (b)	(23.6		)	(16.1		)	(9.8		)	2.5
Ending balance, June 30		$64.2			$40.6			$193.7			$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$3.7			($3.0	)		$—			$—

WPL	Commodity Contract Derivative
	Assets and (Liabilities), net
Three Months Ended June 30	2014			2013
Beginning balance, April 1		$16.1			$0.6
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	16.3			(1.1		)
Purchases	7.9			4.8
Settlements	(3.3		)	(2.4		)
Ending balance, June 30		$37.0			$1.9
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$15.6			($1.1	)

WPL	Commodity Contract Derivative
	Assets and (Liabilities), net
Six Months Ended June 30	2014			2013
Beginning balance, January 1		($10.2	)		($0.6	)
Total net gains (realized/unrealized) included in changes in net assets (a)	50.3			—
Transfers out of Level 3 (c)	—			2.5
Purchases	7.9			4.8
Settlements	(11.0		)	(4.8		)
Ending balance, June 30		$37.0			$1.9
The amount of total net gains for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at June 30 (a)		$42.3			$—

(a) Gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets.

(b) Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold.

(c) Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period.

Fair Value Of Net Derivative Assets (Liabilities)

The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):

	Alliant Energy					IPL					WPL
	Excluding FTRs			FTRs		Excluding FTRs			FTRs		Excluding FTRs			FTRs
June 30, 2014		$31.6			$69.6		$1.7			$62.5		$29.9			$7.1
December 31, 2013	(13.9		)	18.3		(2.1		)	16.7		(11.8		)	1.6

IPL [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Carrying Amount and Fair Value Of Financial Instruments

Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions):

	Alliant Energy				IPL				WPL
June 30, 2014	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Derivative assets (Note 13)		$119.0		$119.0		$73.0		$73.0		$46.0		$46.0
Deferred proceeds (sales of receivables) (Note 4(a))	193.7		193.7		193.7		193.7		—		—
Capitalization and liabilities:
Long-term debt (including current maturities) (Note 8(b))	3,338.9		3,907.4		1,558.7		1,821.3		1,332.3		1,627.1
Cumulative preferred stock (Note 7)	200.0		199.2		200.0		199.2		—		—
Derivative liabilities (Note 13)	13.3		13.3		6.3		6.3		7.0		7.0

	Alliant Energy				IPL				WPL
December 31, 2013	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Derivative assets (Note 13)		$26.7		$26.7		$21.1		$21.1		$5.6		$5.6
Deferred proceeds (sales of receivables) (Note 4(a))	203.5		203.5		203.5		203.5		—		—
Capitalization and liabilities:
Long-term debt (including current maturities) (Note 8(b))	3,336.3		3,712.3		1,558.4		1,726.4		1,332.1		1,532.9
Cumulative preferred stock (Note 7)	200.0		167.0		200.0		167.0		—		—
Derivative liabilities (Note 13)	20.8		20.8		5.2		5.2		15.6		15.6

Fair Value Measurements

Items subject to fair value measurement disclosure requirements were as follows (in millions):

Alliant Energy	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$119.0		$—		$10.6		$108.4		$26.7		$—		$4.7		$22.0
Deferred proceeds	193.7		—		—		193.7		203.5		—		—		203.5
Capitalization and liabilities:
Long-term debt (including current maturities)	3,907.4		—		3,904.1		3.3		3,712.3		—		3,711.8		0.5
Cumulative preferred stock	199.2		199.2		—		—		167.0		167.0		—		—
Derivatives - commodity contracts	13.3		—		6.1		7.2		20.8		—		3.2		17.6

IPL	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$73.0		$—		$6.7		$66.3		$21.1		$—		$3.0		$18.1
Deferred proceeds	193.7		—		—		193.7		203.5		—		—		203.5
Capitalization and liabilities:
Long-term debt (including current maturities)	1,821.3		—		1,821.3		—		1,726.4		—		1,726.4		—
Cumulative preferred stock	199.2		199.2		—		—		167.0		167.0		—		—
Derivatives - commodity contracts	6.3		—		4.2		2.1		5.2		—		1.7		3.5

WPL	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$46.0		$—		$3.9		$42.1		$5.6		$—		$1.7		$3.9
Capitalization and liabilities:
Long-term debt (including current maturities)	1,627.1		—		1,627.1		—		1,532.9		—		1,532.9		—
Derivatives - commodity contracts	7.0		—		1.9		5.1		15.6		—		1.5		14.1

Fair Value Measurements Using Significant Unobservable Inputs

Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):

Alliant Energy	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Three Months Ended June 30	2014			2013			2014		2013
Beginning balance, April 1		$23.9			$4.9			$170.8		$122.1
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	16.9			(1.2		)	—		—
Purchases	76.7			50.9			—		—
Settlements (b)	(16.3		)	(12.1		)	22.9		(52.8		)
Ending balance, June 30		$101.2			$42.5			$193.7		$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$16.3			($1.2	)		$—		$—

Alliant Energy	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Six Months Ended June 30	2014			2013			2014			2013
Beginning balance, January 1		$4.4			$11.9			$203.5			$66.8
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	54.7			(3.0		)	—			—
Transfers out of Level 3 (c)	—			3.6			—			—
Purchases	76.7			50.9			—			—
Settlements (b)	(34.6		)	(20.9		)	(9.8		)	2.5
Ending balance, June 30		$101.2			$42.5			$193.7			$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$46.0			($3.0	)		$—			$—

IPL	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Three Months Ended June 30	2014			2013			2014		2013
Beginning balance, April 1		$7.8			$4.3			$170.8		$122.1
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	0.6			(0.1		)	—		—
Purchases	68.8			46.1			—		—
Settlements (b)	(13.0		)	(9.7		)	22.9		(52.8		)
Ending balance, June 30		$64.2			$40.6			$193.7		$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$0.7			($0.1	)		$—		$—

IPL	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Six Months Ended June 30	2014			2013			2014			2013
Beginning balance, January 1		$14.6			$12.5			$203.5			$66.8
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	4.4			(3.0		)	—			—
Transfers out of Level 3 (c)	—			1.1			—			—
Purchases	68.8			46.1			—			—
Settlements (b)	(23.6		)	(16.1		)	(9.8		)	2.5
Ending balance, June 30		$64.2			$40.6			$193.7			$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$3.7			($3.0	)		$—			$—

WPL	Commodity Contract Derivative
	Assets and (Liabilities), net
Three Months Ended June 30	2014			2013
Beginning balance, April 1		$16.1			$0.6
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	16.3			(1.1		)
Purchases	7.9			4.8
Settlements	(3.3		)	(2.4		)
Ending balance, June 30		$37.0			$1.9
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$15.6			($1.1	)

WPL	Commodity Contract Derivative
	Assets and (Liabilities), net
Six Months Ended June 30	2014			2013
Beginning balance, January 1		($10.2	)		($0.6	)
Total net gains (realized/unrealized) included in changes in net assets (a)	50.3			—
Transfers out of Level 3 (c)	—			2.5
Purchases	7.9			4.8
Settlements	(11.0		)	(4.8		)
Ending balance, June 30		$37.0			$1.9
The amount of total net gains for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at June 30 (a)		$42.3			$—

(a) Gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets.

(b) Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold.

(c) Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period.

Fair Value Of Net Derivative Assets (Liabilities)

The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):

	Alliant Energy					IPL					WPL
	Excluding FTRs			FTRs		Excluding FTRs			FTRs		Excluding FTRs			FTRs
June 30, 2014		$31.6			$69.6		$1.7			$62.5		$29.9			$7.1
December 31, 2013	(13.9		)	18.3		(2.1		)	16.7		(11.8		)	1.6

WPL [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Carrying Amount and Fair Value Of Financial Instruments

Carrying amounts and the related estimated fair values of other financial instruments were as follows (in millions):

	Alliant Energy				IPL				WPL
June 30, 2014	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Derivative assets (Note 13)		$119.0		$119.0		$73.0		$73.0		$46.0		$46.0
Deferred proceeds (sales of receivables) (Note 4(a))	193.7		193.7		193.7		193.7		—		—
Capitalization and liabilities:
Long-term debt (including current maturities) (Note 8(b))	3,338.9		3,907.4		1,558.7		1,821.3		1,332.3		1,627.1
Cumulative preferred stock (Note 7)	200.0		199.2		200.0		199.2		—		—
Derivative liabilities (Note 13)	13.3		13.3		6.3		6.3		7.0		7.0

	Alliant Energy				IPL				WPL
December 31, 2013	Carrying Amount		Fair Value		Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Derivative assets (Note 13)		$26.7		$26.7		$21.1		$21.1		$5.6		$5.6
Deferred proceeds (sales of receivables) (Note 4(a))	203.5		203.5		203.5		203.5		—		—
Capitalization and liabilities:
Long-term debt (including current maturities) (Note 8(b))	3,336.3		3,712.3		1,558.4		1,726.4		1,332.1		1,532.9
Cumulative preferred stock (Note 7)	200.0		167.0		200.0		167.0		—		—
Derivative liabilities (Note 13)	20.8		20.8		5.2		5.2		15.6		15.6

Fair Value Measurements

Items subject to fair value measurement disclosure requirements were as follows (in millions):

Alliant Energy	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$119.0		$—		$10.6		$108.4		$26.7		$—		$4.7		$22.0
Deferred proceeds	193.7		—		—		193.7		203.5		—		—		203.5
Capitalization and liabilities:
Long-term debt (including current maturities)	3,907.4		—		3,904.1		3.3		3,712.3		—		3,711.8		0.5
Cumulative preferred stock	199.2		199.2		—		—		167.0		167.0		—		—
Derivatives - commodity contracts	13.3		—		6.1		7.2		20.8		—		3.2		17.6

IPL	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$73.0		$—		$6.7		$66.3		$21.1		$—		$3.0		$18.1
Deferred proceeds	193.7		—		—		193.7		203.5		—		—		203.5
Capitalization and liabilities:
Long-term debt (including current maturities)	1,821.3		—		1,821.3		—		1,726.4		—		1,726.4		—
Cumulative preferred stock	199.2		199.2		—		—		167.0		167.0		—		—
Derivatives - commodity contracts	6.3		—		4.2		2.1		5.2		—		1.7		3.5

WPL	June 30, 2014								December 31, 2013
	Fair		Level		Level		Level		Fair		Level		Level		Level
	Value		1		2		3		Value		1		2		3
Assets:
Derivatives - commodity contracts		$46.0		$—		$3.9		$42.1		$5.6		$—		$1.7		$3.9
Capitalization and liabilities:
Long-term debt (including current maturities)	1,627.1		—		1,627.1		—		1,532.9		—		1,532.9		—
Derivatives - commodity contracts	7.0		—		1.9		5.1		15.6		—		1.5		14.1

Fair Value Measurements Using Significant Unobservable Inputs

Information for fair value measurements using significant unobservable inputs (Level 3 inputs) was as follows (in millions):

Alliant Energy	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Three Months Ended June 30	2014			2013			2014		2013
Beginning balance, April 1		$23.9			$4.9			$170.8		$122.1
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	16.9			(1.2		)	—		—
Purchases	76.7			50.9			—		—
Settlements (b)	(16.3		)	(12.1		)	22.9		(52.8		)
Ending balance, June 30		$101.2			$42.5			$193.7		$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$16.3			($1.2	)		$—		$—

Alliant Energy	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Six Months Ended June 30	2014			2013			2014			2013
Beginning balance, January 1		$4.4			$11.9			$203.5			$66.8
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	54.7			(3.0		)	—			—
Transfers out of Level 3 (c)	—			3.6			—			—
Purchases	76.7			50.9			—			—
Settlements (b)	(34.6		)	(20.9		)	(9.8		)	2.5
Ending balance, June 30		$101.2			$42.5			$193.7			$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$46.0			($3.0	)		$—			$—

IPL	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Three Months Ended June 30	2014			2013			2014		2013
Beginning balance, April 1		$7.8			$4.3			$170.8		$122.1
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	0.6			(0.1		)	—		—
Purchases	68.8			46.1			—		—
Settlements (b)	(13.0		)	(9.7		)	22.9		(52.8		)
Ending balance, June 30		$64.2			$40.6			$193.7		$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$0.7			($0.1	)		$—		$—

IPL	Commodity Contract Derivative
	Assets and (Liabilities), net						Deferred Proceeds
Six Months Ended June 30	2014			2013			2014			2013
Beginning balance, January 1		$14.6			$12.5			$203.5			$66.8
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	4.4			(3.0		)	—			—
Transfers out of Level 3 (c)	—			1.1			—			—
Purchases	68.8			46.1			—			—
Settlements (b)	(23.6		)	(16.1		)	(9.8		)	2.5
Ending balance, June 30		$64.2			$40.6			$193.7			$69.3
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$3.7			($3.0	)		$—			$—

WPL	Commodity Contract Derivative
	Assets and (Liabilities), net
Three Months Ended June 30	2014			2013
Beginning balance, April 1		$16.1			$0.6
Total net gains (losses) (realized/unrealized) included in changes in net assets (a)	16.3			(1.1		)
Purchases	7.9			4.8
Settlements	(3.3		)	(2.4		)
Ending balance, June 30		$37.0			$1.9
The amount of total net gains (losses) for the period included in changes in net assets attributable to the change in unrealized gains (losses) relating to assets and liabilities held at June 30 (a)		$15.6			($1.1	)

WPL	Commodity Contract Derivative
	Assets and (Liabilities), net
Six Months Ended June 30	2014			2013
Beginning balance, January 1		($10.2	)		($0.6	)
Total net gains (realized/unrealized) included in changes in net assets (a)	50.3			—
Transfers out of Level 3 (c)	—			2.5
Purchases	7.9			4.8
Settlements	(11.0		)	(4.8		)
Ending balance, June 30		$37.0			$1.9
The amount of total net gains for the period included in changes in net assets attributable to the change in unrealized gains relating to assets and liabilities held at June 30 (a)		$42.3			$—

(a) Gains and losses related to derivative assets and derivative liabilities are recorded in regulatory assets and regulatory liabilities on the balance sheets.

(b) Settlements related to deferred proceeds are due to the change in the carrying amount of receivables sold less the allowance for doubtful accounts associated with the receivables sold and cash proceeds received from the receivables sold.

(c) Observable market inputs became available for certain commodity contracts previously classified as Level 3 for transfers out of Level 3. The transfers were valued as of the beginning of the period.

Fair Value Of Net Derivative Assets (Liabilities)

The fair value of electric, natural gas and coal commodity contracts categorized as Level 3 was recognized as net derivative assets (liabilities) as follows (in millions):

	Alliant Energy					IPL					WPL
	Excluding FTRs			FTRs		Excluding FTRs			FTRs		Excluding FTRs			FTRs
June 30, 2014		$31.6			$69.6		$1.7			$62.5		$29.9			$7.1
December 31, 2013	(13.9		)	18.3		(2.1		)	16.7		(11.8		)	1.6