----

|                               Exhibit      12                       |   |
|----------------------------------------------------------------------------------------------|--------|
|                                                                                         |   |
|                                                                                         |   |
|                                                                                         |   |
| SOUTHERN      NATURAL GAS COMPANY                                                            |   |
| COMPUTATION      OF RATIO OF EARNINGS TO FIXED CHARGES                                       |   |
| (IN      MILLIONS, EXCEPT FOR RATIO)                                                         |   |
|                                                                                         |   |
|                                                                                         |   | For      the Nine Months endedSeptember 30, |   |
|                                                                                         |   | 2009 |   |   |   | 2008 |   |
| Earnings                                                                                     |   |   |   |   |
|     Net      Income                                                      |   | $ | 141 |   |   |   | $ | 192 |   |
|     Income      from equity investee                                     |   |   | (8 | )  |   |   |   | (10 | )  |
|        Net income      before income from equity investee |   |   | 133 |   |   |   |   | 182 |   |
|                                                                                         |   |   |   |   |   |   |   |   |   |
|     Fixed      charges                                                   |   |   | 50 |   |   |   |   | 60 |   |
|     Distributed      income of equity investees                          |   |   | 10 |   |   |   |   | 13 |   |
|     Allowance for      funds used during construction                    |   |   | (1 | )  |   |   |   | (3 | )  |
|        Total earnings      available for fixed charges    |   | $ | 192 |   |   |   | $ | 252 |   |
|                                                                                         |   |   |   |   |   |   |   |   |   |
| Fixed      charges                                                                           |   |   |   |   |   |   |   |   |   |
|     Interest and      debt expense                                       |   | $ | 49 |   |   |   | $ | 59 |   |
|     Interest      component of rent                                      |   |   |  1 |   |   |   |   | 1 |   |
|        Total fixed      charges                           |   | $ | 50 |   |   |   | $ | 60 |   |
|                                                                                         |   |   |   |   |   |   |   |   |   |
| Ratio      of earnings to fixed charges                                                      |   |   | 3.8 |   |   |   |   | 4.2 |   |
|                                                                                         |   |

| 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. |
|                                                                              |   |   |   |   |   |   |   |          |
|                                                                                   |
|                                                                              |

|   |
|--------|

----