INTERSTATE POWER AND LIGHT COMPANY
RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDEND REQUIREMENTS
Exhibit 12
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2002 2001 2000 1999 1998
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Net income $ 90,877 $ 98,066 $103,127 $ 97,292 $ 80,667
Income taxes 62,294 52,967 65,020 69,291 52,587
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Net income before income taxes 153,171 151,033 168,147 166,583 133,254
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Interest expense 67,458 68,149 67,234 66,973 67,180
Estimated interest component of rent expense 4,394 4,923 5,530 4,539 4,588
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Fixed charges as defined 71,852 73,072 72,764 71,512 71,768
Preferred dividend requirements (pre-tax basis) 4,824 5,252 5,549 5,815 5,598
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Fixed charges and preferred dividend requirements 76,676 78,324 78,313 77,327 77,366
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Earnings as defined $225,023 $224,105 $240,911 $238,095 $205,022
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Ratio of Earnings to Combined Fixed Charges and
Preferred Dividend Requirements (Unaudited) 2.93 2.86 3.08 3.08 2.65
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