Exhibit-12 LACLEDE GAS COMPANY AND SUBSIDIARY COMPANIES SCHEDULE OF COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES ------------------------------------------------------------- Fiscal Year Ended September 30, ---------------------------------------- 1999 1998 1997 1996 1995 ---- ---- ---- ---- ---- (Thousands of Dollars) Income before interest charges and income taxes $61,016 $64,603 $69,908 $69,168 $49,557 Add: One third of applicable rentals charged to operating expense (which approximates the interest factor) 301 297 294 291 288 ------------------------------------------- Total Earnings $61,317 $64,900 $70,202 $69,459 $49,845 =========================================== Interest on long-term debt $13,966 $14,797 $14,169 $13,939 $12,544 Other interest 6,627 6,473 4,919 4,008 5,983 One-third of applicable rentals charged to operating expense (which approximates the interest factor) 301 297 294 291 288 ------------------------------------------- Total Fixed Charges $20,894 $21,567 $19,382 $18,238 $18,815 =========================================== Ratio of Earnings to Fixed Charges 2.93 3.01 3.62 3.81 2.65 100