Exhibit 12.1



UNITIL CORPORATION



COMPUTATION IN SUPPORT OF RATIO OF EARNINGS TO FIXED CHARGES



|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|----------------------------------------------------- |  | ----------------------- | ------ | ---- | - | ------ |  | ---- | ------ | ---- | - | ------ |  | - | ------
|                                                      |  | Year Ended December 31,
|(000s, except ratios)                                |  | 2006                    |        | 2005 |   | 2004   |  | 2003 |        | 2002
|Earnings:                                             |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|Net Income, per Consolidated Statement of Earnings    |  | $                       | 8,033  |      | $ | 8,553  |  | $    | 8,226  |      | $ | 7,958  |  | $ | 6,088 
|Federal and State Income Taxes included in Operations |  |                         | 4,266  |      |   | 4,275  |  |      | 4,206  |      |   | 3,551  |  |   | 2,490 
|Interest on Long-Term Debt                            |  |                         | 9,404  |      |   | 8,319  |  |      | 8,394  |      |   | 8,088  |  |   | 8,254 
|Amortization of Debt Discount Expense                 |  |                         | 112    |      |   | 104    |  |      | 98     |      |   | 82     |  |   | 81    
|Other Interest                                        |  |                         | 1,675  |      |   | 1,046  |  |      | 629    |      |   | 1,070  |  |   | 1,038 
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|Total                                                 |  | $                       | 23,490 |      | $ | 22,297 |  | $    | 21,553 |      | $ | 20,749 |  | $ | 17,951
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|Fixed Charges:                                        |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|Interest of Long-Term Debt                            |  | $                       | 9,404  |      | $ | 8,319  |  | $    | 8,394  |      | $ | 8,088  |  | $ | 8,254 
|Amortization of Debt Discount Expense                 |  |                         | 112    |      |   | 104    |  |      | 98     |      |   | 82     |  |   | 81    
|Other Interest                                        |  |                         | 1,675  |      |   | 1,046  |  |      | 629    |      |   | 1,070  |  |   | 1,038 
|Pre-tax Preferred Stock Dividend Requirements         |  |                         | 208    |      |   | 234    |  |      | 325    |      |   | 391    |  |   | 419   
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|Total                                                 |  | $                       | 11,399 |      | $ | 9,703  |  | $    | 9,446  |      | $ | 9,631  |  | $ | 9,792 
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|Ratio of Earnings to Fixed Charges                    |  |                         | 2.06   |      |   | 2.30   |  |      | 2.28   |      |   | 2.15   |  |   | 1.83  
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |