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|           Exhibit12                                            |   |
|-----------------------------------------------------------------------------------------|--------|
|                                                                                    |   |
|                                                                                    |   |
|                                                                                    |   |
| SOUTHERN NATURAL GAS COMPANY                                                            |   |
| COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES                                       |   |
| (DOLLARS IN MILLIONS)                                                                   |   |
|                                                                                    |   |
|                                                                                    |   | For the Six Months Ended June 30, |   |
|                                                                                    |   | 2009 |   |   |   | 2008 |   |
| Earnings                                                                                |   |   |   |   |
|     Net income                                                      |   | $ | 96 |   |   |   | $ | 148 |   |
|     Income from equity investee                                     |   |   | (5) |   |   |   |   | (8) |   |
|        Net income before income from equity investee |   |   | 91 |   |   |   |   | 140 |   |
|                                                                                    |   |   |   |   |   |   |   |   |   |
|     Fixed charges                                                   |   |   | 33 |   |   |   |   | 41 |   |
|     Distributed income of equity investees                          |   |   | 7 |   |   |   |   | 9 |   |
|     Allowance for funds used during construction                    |   |   | (1) |   |   |   |   | (2) |   |
|        Total earnings available for fixed charges    |   | $ | 130 |   |   |   | $ | 188 |   |
|                                                                                    |   |   |   |   |   |   |   |   |   |
| Fixed charges                                                                           |   |   |   |   |   |   |   |   |   |
|     Interest and debt expense                                       |   | $ | 33 |   |   |   | $ | 41 |   |
|                                                                                    |   |   |   |   |   |   |   |   |   |
| Ratio of earnings to fixed charges                                                      |   |   | 3.9 |   |   |   |   | 4.6 |   |
|                                                                                    |   |

| For purposes of computing these ratios, earnings means net income before:                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|     - income from equity investee, adjusted to reflect actual distribution from equity investment; and                                                       |   |
|     - fixed charges;                                                                                                                                         |   |
| less                                                                                                                                                                        |   |
|     - allowance for funds used during construction.                                                                                                          |   |
|                                                                                                                                                                             |   |   |   |   |   |   |   |   |   |
| Fixed charges means the sum of the following:                                                                                                                                    |   |   |   |   |   |
|     - interest costs;                                                                                                                                        |   |
|     - amortization of debt costs; and                                                                                                                        |   |   |   |   |   |   |   |
|     - that portion of rental expense which we believe represents an interest factor, which was not material for the six months ended June 30, 2009 and 2008. |   |   |   |   |

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