RATIO OF EARNINGS TO FIXED CHARGES The table sets forth the ratio of earnings to fixed charges of the Company and its consolidated subsidiaries of the periods indicated. Year Ended December 31, - ----------------------------------------------------- 1996 1995 1994 1993 1992 ---- ---- ---- ---- ---- Ratio of earnings to fixed charges 2.3x 1.9x 3.6x 4.0x 3.1x In the calculation of the ratio of earnings to fixed charges, "earnings" consists of income before income taxes, adjusted to add back fixed charges (excluding capitalized interest relating to oil and gas properties), the amortization of interest previously capitalized on oil and gas properties, and the Company's 47.93% ownership share of the fixed charges of NOARK. "Fixed charges" consists of interest on borrowings (including capitalized interest), amortization of debt discount and expense, a portion of rental expense determined to be representative of the interest factor, and the Company's 60% guaranty of the fixed charges of NOARK. A statement setting forth the computation of the unaudited ratio of earnings to fixed charges is filed as an exhibit to the registration statement of which this Prospectus Supplement is a part. EXHIBIT 12 SOUTHWESTERN ENERGY COMPANY AND SUBSIDIARIES COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES ($ in 000's) Year Ended December 31 - --------------------------------------------------------- 1996 1995 1994 1993 1992 1991 ---- ---- ---- ---- - ---- ---- Income before income taxes $30,937 $18,794 $40,853 $46,882 $35,584 $32,222 Add: Fixed charges, Southwestern 17,336 13,773 10,616 10,702 11,636 11,398 Fixed charges, NOARK (1) 3,802 3,740 3,642 3,312 901 13 Amortization of capitalized interest 931 825 813 677 470 341 Deduct: Interest capitalized on oil and gas properties 4,083 2,305 1,562 1,441 1,491 1,404 ------- ------- ------- ------- - ------- ------- Earnings for computation $48,922 $34,828 $54,362 $60,132 $47,100 $42,570 ======= ======= ======= ======= ======= ======= Fixed charges: Southwestern: Interest on indebtedness $16,652 $13,398 $10,285 $10,399 $11,335 $11,155 Amortization of debt discount and expense 533 225 180 174 144 85 Portion of rents representative of interest 150 150 150 129 156 158 ------- ------- ------- ------- - ------- ------- Total fixed charges, Southwestern 17,336 13,773 10,615 10,702 11,635 11,398 NOARK (2) 4,296 4,682 4,605 4,199 3,661 371 ------- ------- ------- ------- - ------- ------- Total fixed charges $21,631 $18,455 $15,220 $14,901 $15,296 $11,769 ======= ======= ======= ======= ======= ======= Ratio of earnings to fixed charges 2.3 1.9 3.6 4.0 3.1 3.6 ======= ======= ======= ======= ======= ======= (1) Represents Southwestern's ownership share of interest on indebtedness and amortization of debt expense of the NOARK Pipeline System, Limited Partnership ("NOARK"). (2) Represents Southwestern's 60% guaranty of NOARK's interest on indebtedness and amortization of debt expense.