EXHIBIT 12 Northwest Natural Gas Company Computation of Ratio of Earnings to Fixed Charges January 1, 1989 - March 31, 1994 ($000) Twelve ------------Year Ended December 31---------- Months Ended March 31, 1989 1990 1991 1992 1993 1994 ---- ---- ---- ---- ---- ----------- Fixed Charges, as defined: Interest on Long-Term Debt . $19,344 $22,244 $21,977 $23,001 $22,578 $22,244 Other Interest . . . . . . . 4,011 2,853 4,266 3,223 1,906 2,028 Amortization of Debt Discount and Expense. . . . 401 363 348 511 775 853 Interest Portion of Rentals . . . . . . . . . . 1,235 1,546 1,485 1,439 1,701 1,700 ------- ------- ------- ------- ------- ------- Total Fixed Charges, as defined. . . . . . . . . $24,991 $27,006 $28,076 $28,174 $26,960 $26,825 ======= ======= ======= ======= ======= ======= Earnings, as defined: Net Income . . . . . . . . . $28,420 $30,724 $14,377 $15,775 $37,647 $31,774 Taxes on Income. . . . . . . 15,366 13,629 2,321 6,951 22,096 20,342 Fixed Charges, as above. . . 24,991 27,006 28,076 28,174 26,960 26,825 ------- ------- ------- ------- ------- ------- Total Earnings, as defined . $68,777 $71,359 $44,774 $50,900 $86,703 $78,941 ======= ======= ======= ======= ======= ======= Ratio of Earnings to Fixed Charges . . . . . . . . 2.75 2.64 1.59 1.81 3.22 2.94 ==== ==== ==== ==== ==== ====