Exhibit 12.2
INTERSTATE POWER AND LIGHT COMPANY
RATIO OF EARNINGS TO FIXED CHARGES AND RATIO OF EARNINGS TO COMBINED FIXED CHARGES
AND PREFERRED DIVIDEND REQUIREMENTS
Nine Months | ||||||||
Ended Sep. 30, | Years Ended Dec. 31, | |||||||
2006 | 2005 | 2005* | 2004 | 2003 | 2002 | 2001 | ||
(dollars in millions) | ||||||||
EARNINGS: | ||||||||
Net income | $133.7 | $129.6 | $165.1 | $125.7 | $100.7 | $90.9 | $98.1 | |
Income taxes | 65.6 | 74.8 | 80.8 | 61.7 | 71.3 | 62.3 | 53.0 | |
Income before income taxes | 199.3 | 204.4 | 245.9 | 187.4 | 172.0 | 153.2 | 151.1 | |
Fixed charges as defined | 53.9 | 56.7 | 72.5 | 72.3 | 69.4 | 68.1 | 69.6 | |
Total earnings as defined | $253.2 | $261.1 | $318.4 | $259.7 | $241.4 | $221.3 | $220.7 | |
FIXED CHARGES: | ||||||||
Interest expense | $52.8 | $53.3 | $67.7 | $67.9 | $65.4 | $63.7 | $64.6 | |
Estimated interest component of rent expense | 1.1 | 3.4 | 4.8 | 4.4 | 4.0 | 4.4 | 5.0 | |
Total fixed charges as defined | $53.9 | $56.7 | $72.5 | $72.3 | $69.4 | $68.1 | $69.6 | |
Ratio of Earnings to Fixed Charges (Unaudited) | 4.70 | 4.60 | 4.39 | 3.59 | 3.48 | 3.25 | 3.17 | |
Preferred dividend requirements (pre-tax basis) * | $17.1 | $18.1 | $22.9 | $23.0 | $23.2 | $4.9 | $5.2 | |
Fixed charges and preferred dividend requirements | $71.0 | $74.8 | $95.4 | $95.3 | $92.6 | $73.0 | $74.8 | |
Ratio of Earnings to Combined Fixed Charges and | ||||||||
Preferred Dividend Requirements (Unaudited) | 3.57 | 3.49 | 3.34 | 2.73 | 2.61 | 3.03 | 2.95 | |
* Preferred dividend requirements (pre-tax basis) are computed by dividing the preferred dividend requirements by one hundred percent minus the respective year-to-date effective income tax rate.