Exhibit No. 12. Questar Pipeline Company and Subsidiaries Ratio of Earnings to Fixed Charges (Unaudited) 12 months ended June 30, 2000 1999 (Dollars in Thousands) Earnings Income (loss) before income taxes ($12,985) $43,782 Plus debt expense 18,342 15,737 Plus allowance for borrowed funds used during construction 2,796 1,821 Plus interest portion of rental expense 273 285 $8,426 $61,625 Fixed Charges Debt expense $18,342 $15,737 Plus allowance for borrowed funds used during construction 2,796 1,821 Plus interest portion of rental expense 273 285 $21,411 $17,843 Ratio of Earnings to Fixed Charges 0.39 3.45