Exhibit 12.1
ALLIANT ENERGY CORPORATION
RATIO OF EARNINGS TO FIXED CHARGES
| Nine Months Ended September 30, | Years Ended Dec. 31, | |||||||||||||||||||||||||||
| 2011 | 2010 | 2010 | 2009 | 2008 | 2007 | 2006 | ||||||||||||||||||||||
| (dollars in millions) | ||||||||||||||||||||||||||||
EARNINGS: | ||||||||||||||||||||||||||||
Net income from continuing operations attributable to Alliant Energy Corporation common shareowners | $ | 245.3 | $ | 242.3 | $ | 289.3 | $ | 110.1 | $ | 279.4 | $ | 425.1 | $ | 337.8 | ||||||||||||||
Income tax expense (benefit) (a) | 46.1 | 121.8 | 145.2 | (9.3 | ) | 139.6 | 256.3 | 202.8 | ||||||||||||||||||||
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Subtotal | 291.4 | 364.1 | 434.5 | 100.8 | 419.0 | 681.4 | 540.6 | |||||||||||||||||||||
Fixed charges as defined | 163.3 | 167.6 | 219.3 | 200.6 | 186.5 | 185.6 | 213.4 | |||||||||||||||||||||
Adjustment for undistributed equity earnings | (5.2 | ) | (4.2 | ) | (5.9 | ) | (6.7 | ) | (6.1 | ) | (7.8 | ) | (16.6 | ) | ||||||||||||||
Less: | ||||||||||||||||||||||||||||
Interest capitalized | 1.3 | — | — | — | — | — | — | |||||||||||||||||||||
Preferred dividend requirements of subsidiaries (pre-tax basis) (b) | 16.8 | 20.7 | 27.5 | 17.3 | 27.5 | 29.5 | 29.3 | |||||||||||||||||||||
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Total earnings as defined | $ | 431.4 | $ | 506.8 | $ | 620.4 | $ | 277.4 | $ | 571.9 | $ | 829.7 | $ | 708.1 | ||||||||||||||
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FIXED CHARGES: | ||||||||||||||||||||||||||||
Interest expense | $ | 119.7 | $ | 122.2 | $ | 163.0 | $ | 154.9 | $ | 125.8 | $ | 116.7 | $ | 145.7 | ||||||||||||||
Interest capitalized | 1.3 | — | — | — | — | — | — | |||||||||||||||||||||
Estimated interest component of rent expense | 25.5 | 24.7 | 28.8 | 28.4 | 33.2 | 39.4 | 38.4 | |||||||||||||||||||||
Preferred dividend requirements of subsidiaries (pre-tax basis) (b) | 16.8 | 20.7 | 27.5 | 17.3 | 27.5 | 29.5 | 29.3 | |||||||||||||||||||||
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Total fixed charges as defined | $ | 163.3 | $ | 167.6 | $ | 219.3 | $ | 200.6 | $ | 186.5 | $ | 185.6 | $ | 213.4 | ||||||||||||||
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Ratio of Earnings to Fixed Charges (c) | 2.64 | 3.02 | 2.83 | 1.38 | 3.07 | 4.47 | 3.32 | |||||||||||||||||||||
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| (a) | Includes net interest related to unrecognized tax benefits. |
| (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. |
| (c) | The ratio calculation in the above table relates to Alliant Energy Corporation’s continuing operations. |