EXHIBIT 12 Northwest Natural Gas Company Computation of Ratio of Earnings to Fixed Charges January 1, 1990 - December 31, 1994 ($000) ------------Year Ended December 31---------- 1990 1991 1992 1993 1994 ---- ---- ---- ---- ---- Fixed Charges, as defined: Interest on Long-Term Debt $22,244 $21,977 $23,001 $22,578 $21,921 Other Interest 2,853 4,266 3,223 1,906 2,473 Amortization of Debt Discount and Expense 363 348 511 775 850 Interest Portion of Rentals 1,546 1,485 1,439 1,701 1,697 ------- ------- ------- ------- ------- Total Fixed Charges, as defined $27,006 $28,076 $28,174 $26,960 $26,941 ======= ======= ======= ======= ======= Earnings, as defined: Net Income $30,724 $14,377 $15,775 $37,647 $35,461 Taxes on Income 13,629 2,321 6,951 22,096 20,473 Fixed Charges, as above 27,006 28,076 28,174 26,960 26,941 ------- ------- ------- ------- ------- Total Earnings, as defined $71,359 $44,774 $50,900 $86,703 $82,875 ======= ======= ======= ======= ======= Ratio of Earnings to Fixed Charges 2.64 1.59 1.81 3.22 3.08 ==== ==== ==== ==== ====