| UniSource      Energy Corporation                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| Computation      of Ratio of Earnings to Fixed Charges                                                                                   |
|                                                                                                                                     |   |   |   |   |   |   |   |
|                                                                                                                                     |   |   |   |   |   |   |   |
|                                                                                                                                     |   |   |   |   |   |   |   |
|                                                                                                                                     | 6 Months      Ended | 12 Months      Ended | 12 Months      Ended(2) |   |
|                                                                                                                                     | Jun.      30, | Jun.      30, | Dec.      31, | Dec.      31, | Dec.      31, | Dec.      31, | Dec.      31, |
|                                                                                                                                     | 2008 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 |
|                                                                                                                                     |   |   |   |  -      Thousands of Dollars - |   |
| Fixed      Charges:                                                                                                                      |   |   |   |   |   |   |   |
|                                                                                                                                     |   |   |   |   |   |   |   |
|   Interest      on Long-Term Debt                                                                                              |  $            35,420 |  $            72,250 |  $            73,095 |  $  75,039 |  $  76,762 |  $  80,968 |  $  80,844 |
|   Other      Interest (1)                                                                                                      | 1,723 | 3,793 | 5,480 | 7,922 | 3,153 | 1,947 | 3,709 |
|   Interest      on Capital Lease Obligations                                                                                   | 28,667 | 60,888 | 64,499 | 72,586 | 79,098 | 85,912 | 84,080 |
| Total      Fixed Charges                                                                                                                 |  $            65,810 |  $          136,931 |  $          143,074 |  $155,547 |  $159,013 |  $168,827 |  $168,633 |
|                                                                                                                                     |   |   |   |   |   |   |   |
| Net      Income                                                                                                                          | 2,132 | 43,757 | 58,373 | 67,447 | 46,144 | 45,919 | 113,941 |
|                                                                                                                                     |   |   |   |   |   |   |   |
| Less:                                                                                                                                    |   |   |   |   |   |   |   |
|    Discontinued      Operations - Net of Tax                                                                              |                        - |                        - |                        - |       (1,796) |       (5,483) |       (5,063) |       (7,472) |
|    Accounting      Change - Net of Tax                                                                                    |                        - |                        - |                        - |              - |          (626) |              - | 67,471 |
| Net      Income/(Loss) from Continuing Operations                                                                                        | 2,132 | 43,757 | 58,373 | 69,243 | 52,253 | 50,982 | 53,942 |
|                                                                                                                                     |   |   |   |   |   |   |   |
| Add      (Deduct):                                                                                                                       |   |   |   |   |   |   |   |
|   (Income)      Losses from Equity Investees (2)                                                                               |                  1,535 |                  1,701 | 340 | (210) | (2,113) | (7,121) | 3,051 |
|   Income      Taxes                                                                                                            | 2,913 | 30,044 | 39,079 | 43,936 | 37,623 | 37,186 | 16,531 |
|   Total      Fixed Charges                                                                                                     | 65,810 | 136,931 | 143,074 | 155,547 | 159,013 | 168,827 | 168,633 |
|                                                                                                                                     |   |   |   |   |   |   |   |
| Total      Earnings before Taxes                                                                                                         |   |   |   |   |   |   |   |
| and      Fixed Charges                                                                                                                   |  $            72,390 |  $          212,433 |  $          240,866 |  $268,516 |  $246,776 |  $249,874 |  $242,157 |
|                                                                                                                                     |   |   |   |   |   |   |   |
|                                                                                                                                     |   |   |   |   |   |   |   |
| Ratio      of Earnings to Fixed Charges                                                                                                  | 1.100 | 1.551 | 1.684 | 1.726 | 1.552 | 1.480 | 1.436 |
|                                                                                                                                     |   |   |   |   |   |   |   |
|                                                                                                                                     |   |   |   |   |   |   |   |
| (1)  Excludes      recognition of Allowance for Borrowed Funds Used During      Construction.                                  |   |   |   |   |   |
|                                                                                                                                     |   |   |   |   |   |   |   |
| (2)  The      information previously reported has been reclassified for the discontinued      operations of Global Solar, Inc. |   |   |   |