|                                                                                         |   | Year      Ended December 31, |    |         |  Twelve Months      Ended |         |   |  Three      Months      Ended |    |
|----------------------------------------------------------------------------------------------|--------|------------------------------|---------|--------------|-------------------------------------|--------------|--------|------------------------------------|---------|
|                                                                                         |   | 2003                         |    | 2004         |                                | 2005         |   | 2006                               |    | 2007 |   |   | 3/31/2008 |   |   | 3/31/2008  |   |
| EARNINGS                                                                                     |   |                    |    |    |                                |    |   |                          |    |    |   |   |   |   |   |   |   |
| Income      Before Income Taxes                                                              |   | $                            | 246,809 |         | $                                   | 207,929      |   | $                                  | 199,259 |   | $ | 286,422 |   | $ | 387,473 |   | $ | 434,370 |   | $ | 116,498 |   |
| Fixed      Charges (as below)                                                                |   |                         | 58,771  |         |                                | 61,742       |   |                               | 63,665  |   |   | 74,155 |   |   | 79,400 |   |   | 82,119 |   |   | 20,895 |   |
| Total      Earnings                                                                          |   | $                            | 305,580 |         | $                                   | 269,671      |   | $                                  | 262,924 |   | $ | 360,577 |   | $ | 466,873 |   | $ | 516,489 |   | $ |  137,393 |   |
|                                                                                         |   |                         |    |         |                                |         |   |                               |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| FIXED CHARGES                                                                           |   |                         |    |         |                                |         |   |                               |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest      Expense                                                                        |   | $                            | 50,948  |         | $                                   | 54,246       |   | $                                  | 59,539  |   | $ | 66,100 |   | $ | 69,625 |   | $ | 73,583 |   | $ | 19,239 |   |
| Credit      for Allowance for Borrowed Funds         Used During      Construction |   |                         | 5,123   |         |                                | 4,996        |   |                               | 1,526   |   |   | 5,955 |   |   | 7,275 |   |   |  6,036 |   |   | 1,031 |   |
| Estimated      Interest Element in Lease Rentals                                             |   |                         | 2,700   |         |                                | 2,500        |   |                               | 2,600   |   |   | 2,100 |   |   | 2,500 |   |   | 2,500 |   |   | 625 |   |
| Total Fixed      Charges                                                                     |   | $                            | 58,771  |         | $                                   | 61,742       |   | $                                  | 63,665  |   | $ | 74,155 |   | $ | 79,400 |   | $ | 82,119 |   | $ |  20,895 |   |
|                                                                                         |   |                         |    |         |                                |         |   |                               |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio of Earnings to Fixed      Charges                                                      |   |                         | 5.19    |         |                                | 4.36         |   |                               | 4.12    |   |   | 4.86 |   |   | 5.88 |   |   | 6.28 |   |   | 6.57 |   |