Exhibit



	Nine Months Ended
	September 30,						Years Ended December 31,
	2015			2014			2014			2013			2012			2011			2010
	(dollars in millions)
EARNINGS:
Net income from continuing operations attributable to Alliant Energy Corporation common shareowners		$345.5			$325.3			$385.5			$364.2			$324.9			$323.1			$291.5
Income taxes (a)	59.5			46.2			44.3			53.9			89.4			69.2			147.7
Subtotal	405.0			371.5			429.8			418.1			414.3			392.3			439.2
Fixed charges as defined	151.5			146.4			195.7			189.0			208.0			208.4			215.4
Adjustment for undistributed equity earnings	(7.1		)	(7.0		)	(4.0		)	(8.3		)	(7.1		)	(7.0		)	(5.9		)
Less:
Interest capitalized	1.1			0.6			1.0			0.5			6.1			2.7			—
Preferred dividend requirements of subsidiaries (pre-tax basis) (b)	9.0			8.8			11.3			13.0			20.1			22.0			27.6
Total earnings as defined		$539.3			$501.5			$609.2			$585.3			$589.0			$569.0			$621.1

FIXED CHARGES:
Interest expense		$139.5			$134.9			$180.6			$172.8			$156.7			$158.3			$162.8
Interest capitalized	1.1			0.6			1.0			0.5			6.1			2.7			—
Estimated interest component of rent expense	1.9			2.1			2.8			2.7			25.1			25.4			25.0
Preferred dividend requirements of subsidiaries (pre-tax basis) (b)	9.0			8.8			11.3			13.0			20.1			22.0			27.6
Total fixed charges as defined		$151.5			$146.4			$195.7			$189.0			$208.0			$208.4			$215.4

Ratio of Earnings to Fixed Charges (c)	3.56			3.43			3.11			3.10			2.83			2.73			2.88

(b) 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. Excludes the impact of charges related to Interstate Power and Light Company’s and Wisconsin Power and Light Company’s preferred stock redemptions in 2013.