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| COLORADO      INTERSTATE GAS COMPANY                                                  |   |
|---------------------------------------------------------------------------------------|--------|
| COMPUTATION      OF RATIO OF EARNINGS TO FIXED CHARGES                                |   |
|  (IN      MILLIONS, EXCEPT FOR RATIO)                                            |   |
|                                                                                  |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                  |   | FOR      THE YEARS ENDED DECEMBER 31, |   |
|                                                                                  |   | 2009 |   |   | 2008 |   |   | 2007 |   |   | 2006 |   |   | 2005 |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Earnings                                                                              |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income before      income taxes from continuing operations                            |   | $ | 157 |   |   | $ | 149 |   |   | $ | 151 |   |   | $ | 139 |   |   | $ | 108 |   |
|   Income      from equity investee                                               |   |   | (1 | ) |   |   | (3 | ) |   |   | (2 | ) |   |   | - |   |   |   | - |   |
| Pre-tax      income from continuing operationsbefore income      from equity investee |   | $ | 156 |   |   | $ | 146 |   |   | $ | 149 |   |   | $ | 139 |   |   | $ | 108 |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed      charges                                                                    |   |   | 56 |   |   |   | 42 |   |   |   | 61 |   |   |   | 51 |   |   |   | 38 |   |
| Distributed      income of equity investee                                            |   |   | 1 |   |   |   | 1 |   |   |   | - |   |   |   | - |   |   |   | - |   |
|  Allowance      for funds used during construction                               |   |   | (1 | ) |   |   | (2 | ) |   |   | (1 | ) |   |   | - |   |   |   | (1 | ) |
| Totals      earnings available for fixed charges                                      |   | $ | 212 |   |   | $ | 187 |   |   | $ | 209 |   |   | $ | 190 |   |   | $ | 145 |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed      charges                                                                    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest and      debt costs                                                          |   | $ | 55 |   |   | $ | 41 |   |   | $ | 60 |   |   | $ | 50 |   |   | $ | 37 |   |
| Interest      component of rent                                                       |   |   | 1 |   |   |   | 1 |   |   |   | 1 |   |   |   | 1 |   |   |   | 1 |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|  Total      fixed charges                                                        |   | $ | 56 |   |   | $ | 42 |   |   | $ | 61 |   |   | $ | 51 |   |   | $ | 38 |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio of      earnings to fixed charges                                               |   |   | 3.8 |   |   |   | 4.5 |   |   |   | 3.4 |   |   |   | 3.7 |   |   |   | 3.8 |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|                                                                                  |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |

| 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.                         |   |   |   |   |   |

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