Exhibit No. 12. Questar Pipeline Company and Subsidiaries Ratio of Earnings to Fixed Charges (Unaudited) 12 months ended March 31, 2000 1999 (Dollars in Thousands) Earnings Income (loss) before income taxes ($13,402) $44,325 Plus debt expense 17,988 15,199 Plus allowance for borrowed funds used during construction 2,605 1,326 Plus interest portion of rental expense 201 342 $7,392 $61,192 Fixed Charges Debt expense $17,988 $15,199 Plus allowance for borrowed funds used during construction 2,605 1,326 Plus interest portion of rental expense 201 342 $20,794 $16,867 Ratio of Earnings to Fixed Charges 0.36 3.63