Exhibit 12.1
ALLIANT ENERGY CORPORATION
RATIO OF EARNINGS TO FIXED CHARGES
	Nine Months
	Ended Sep. 30,						Years Ended Dec. 31,
	2009			2008			2008			2007			2006			2005 (a)			2004
	(dollars in millions)
EARNINGS:
Net income from continuing operations attributable to
Alliant Energy Corporation common shareowners	$	58.4		$	229.0		$	280.0		$	424.7		$	338.3		$	56.4		$	218.4
Income tax expense (benefit) (b)		(26.5	)		118.8			140.2			255.8			203.0			(52.9	)		91.2
Subtotal		31.9			347.8			420.2			680.5			541.3			3.5			309.6
Fixed charges as defined		147.8			138.9			186.5			185.6			213.4			226.7			238.8
Adjustment for undistributed equity earnings		(4.9	)		(4.0	)		(6.1	)		(7.8	)		(16.6	)		(41.7	)		(21.0	)
Less:
Interest capitalized		-			-			-			-			-			3.4			5.4
Preferred dividend requirements of subsidiaries (pre-tax basis) (c)		8.9			20.8			27.5			29.5			29.3			5.5			25.9
Total earnings as defined	$	165.9		$	461.9		$	573.1		$	828.8		$	708.8		$	179.6		$	496.1
FIXED CHARGES:
Interest expense	$	113.8		$	90.0		$	125.8		$	116.7		$	145.7		$	175.8		$	176.9
Interest capitalized		-			-			-			-			-			3.4			5.4
Estimated interest component of rent expense		25.1			28.1			33.2			39.4			38.4			42.0			30.6
Preferred dividend requirements of subsidiaries (pre-tax basis) (c)		8.9			20.8			27.5			29.5			29.3			5.5			25.9
Total fixed charges as defined	$	147.8		$	138.9		$	186.5		$	185.6		$	213.4		$	226.7		$	238.8
Ratio of Earnings to Fixed Charges (d)		1.12			3.33			3.07			4.47			3.32			0.79			2.08
(a) For the year ended Dec. 31, 2005, earnings as defined were inadequate to cover fixed charges as defined by $47.1 million.
(b) Includes net interest related to unrecognized tax benefits.
(c) Preferred dividend requirements of subsidiaries (pre-tax basis) are computed by dividing the preferred dividend requirements of subsidiaries by one
hundred percent minus the respective year-to-date effective income tax rate.
(d) The ratio calculation in the above table relates to Alliant Energy Corporation's continuing operations.