EXHIBIT 12.1
TRANSCONTINENTAL GAS PIPE LINE CORPORATION
COMPUTATION OF EARNINGS TO FIXED CHARGES
Thousands of Dollars, except ratios
<Table>
<Caption>
Six Months Ended
June 30,
Year Ended December 31, (Unaudited)
-------------------------------------------------------- --------------------
1996 1997 1998 1999 2000 2000 2001
-------- -------- -------- -------- -------- -------- --------
Earning Available for Fixed Charges:
Net Income 95,543 111,388 135,694 161,187 191,801 115,921 91,566
Undistributed earnings of equity investees (382) (504) (239) (3,214) (2,623) (3,771) 4,688
Plus - Interest expense and portion of
rents representative of the
interest factor, net of interest
capitalized, and amortization of
debt expense, discount and premium 69,189 73,070 95,227 74,808 81,218 39,167 36,316
Federal income taxes 88,927 68,632 75,422 30,163 86,765 32,487 48,092
Deferred federal income taxes (37,613) (3,041) (5,056) 57,299 14,603 28,869 734
State and Municipal income taxes 7,300 1,002 8,914 11,459 14,438 8,336 6,453
-------- -------- -------- -------- -------- -------- --------
Total 222,964 250,547 309,962 331,702 386,202 221,009 187,849
======== ======== ======== ======== ======== ======== ========
Fixed Charges:
Interest on long-term debt 56,623 56,611 68,477 67,732 69,691 34,519 34,113
Other interest expense (includes intercompany) 10,509 14,640 21,912 1,642 6,358 1,786 (737)
Portion of rents representative of the interest
factor, including amounts capitalized 7,504 6,770 6,945 7,290 7,300 3,820 4,031
Amortization of debt expense, discount
and premium (3,294) (3,098) 275 254 210 110 88
-------- -------- -------- -------- -------- -------- --------
Total 71,342 74,923 97,609 76,918 83,559 40,235 37,495
======== ======== ======== ======== ======== ======== ========
Ratio of earnings to fixed charges 3.13 3.34 3.18 4.31 4.62 5.49 5.01
</Table>
For purposes of calculating the ratio of earnings to fixed charges:
(a) Earnings represent the aggregate of pre-tax income, adjusted for
distributed income of equity investees, and fixed charges, net of interest
capitalized.
(b) Fixed charges represent interest (whether expensed or capitalized), the
amortization of total debt premium, discount and expense, and that portion
of rentals considered to be representative of the interest factor.