EX-12 4 sdc370f.txt COMPUTATION STATEMENT INTERSTATE POWER AND LIGHT COMPANY RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDEND REQUIREMENTS Exhibit 12
----------------------------------------------------------------- 2002 2001 2000 1999 1998 ----------------------------------------------------------------- Net income $ 90,877 $ 98,066 $103,127 $ 97,292 $ 80,667 Income taxes 62,294 52,967 65,020 69,291 52,587 ----------------------------------------------------------------- Net income before income taxes 153,171 151,033 168,147 166,583 133,254 ----------------------------------------------------------------- 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 ----------------------------------------------------------------- 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 ----------------------------------------------------------------- Fixed charges and preferred dividend requirements 76,676 78,324 78,313 77,327 77,366 ----------------------------------------------------------------- Earnings as defined $225,023 $224,105 $240,911 $238,095 $205,022 ================================================================= Ratio of Earnings to Combined Fixed Charges and Preferred Dividend Requirements (Unaudited) 2.93 2.86 3.08 3.08 2.65 =================================================================