Exhibit 12.1



UNITIL CORPORATION



COMPUTATION IN SUPPORT OF RATIO OF EARNINGS TO FIXED CHARGES



|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|----------------------------------------------------- |  | ----------------------- | ------ | ---- | - | ------ |  | ---- | ------ | ---- | - | ------ |  | - | ------
|                                                      |  | Year Ended December 31,
|                                                      |  | 2009                    |        | 2008 |   | 2007   |  | 2006 |        | 2005
|(000s, except ratios)                                |  |                         |        |      |   |        |  |      |        |     
|                                                      |  |                         |        |      |  
|Earnings:                                             |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|                                                      |  |                         |        |      |  
|Net Income, per Consolidated Statements of Earnings   |  | $                       | 10,049 |      | $ | 9,735  |  | $    | 8,746  |      | $ | 8,033  |  | $ | 8,553 
|                                                      |  |                         |        |      |  
|Federal and State Income Taxes included in Operations |  |                         | 5,220  |      |   | 4,450  |  |      | 4,482  |      |   | 4,266  |  |   | 4,275 
|                                                      |  |                         |        |      |  
|Interest on Long-Term Debt                            |  |                         | 17,961 |      |   | 11,795 |  |      | 10,919 |      |   | 9,404  |  |   | 8,319 
|                                                      |  |                         |        |      |  
|Amortization of Debt Discount Expense                 |  |                         | 233    |      |   | 151    |  |      | 136    |      |   | 112    |  |   | 104   
|                                                      |  |                         |        |      |  
|Other Interest                                        |  |                         | 2,474  |      |   | 1,156  |  |      | 1,949  |      |   | 1,675  |  |   | 1,046 
|                                                      |  |                         |        |      |  
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|                                                      |  |                         |        |      |  
|Total                                                 |  | $                       | 35,937 |      | $ | 27,287 |  | $    | 26,232 |      | $ | 23,490 |  | $ | 22,297
|                                                      |  |                         |        |      |  
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|                                                      |  |                         |        |      |  
|Fixed Charges:                                        |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|                                                      |  |                         |        |      |  
|Interest on Long-Term Debt                            |  | $                       | 17,961 |      | $ | 11,795 |  | $    | 10,919 |      | $ | 9,404  |  | $ | 8,319 
|                                                      |  |                         |        |      |  
|Amortization of Debt Discount Expense                 |  |                         | 233    |      |   | 151    |  |      | 136    |      |   | 112    |  |   | 104   
|                                                      |  |                         |        |      |  
|Other Interest                                        |  |                         | 2,474  |      |   | 1,156  |  |      | 1,949  |      |   | 1,675  |  |   | 1,046 
|                                                      |  |                         |        |      |  
|Pre-tax Preferred Stock Dividend Requirements         |  |                         | 208    |      |   | 199    |  |      | 213    |      |   | 208    |  |   | 234   
|                                                      |  |                         |        |      |  
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|                                                      |  |                         |        |      |  
|Total                                                 |  | $                       | 20,876 |      | $ | 13,301 |  | $    | 13,217 |      | $ | 11,399 |  | $ | 9,703 
|                                                      |  |                         |        |      |  
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |       
|                                                      |  |                         |        |      |  
|Ratio of Earnings to Fixed Charges                    |  |                         | 1.72   |      |   | 2.05   |  |      | 1.98   |      |   | 2.06   |  |   | 2.30  
|                                                      |  |                         |        |      |   |        |  |      |        |      |   |        |  |   |