Hampton, NH - (April 24, 2006): Unitil Corporation (AMEX:UTL) announced today that its Massachusetts subsidiary filed changes in its Basic Service energy prices and Transition Service Charge with the Massachusetts Department of Telecommunications and Energy ("M.D.T.E."). These changes are expected to take effect June 1, 2006.

A typical residential customer using 500 kWh per month will see their bill decrease from $102.36 to $98.49, or 3.8%. Other customers will see decreases ranging from 0.4% - 4.5%, based on rate class and usage. The small number of customers who have contracted with a Competitive Supplier and do not take Basic Service will see overall bill increases in the range of 2.4% - 3.6% due to the change in the Transition Service Charge.

Basic Service is provided to customers who do not have their own retail competitive electricity supply. This service is procured through a competitive bid process and the resulting prices are passed through to customers without profit or mark up from the local distribution company. Basic Service prices change for residential and small to medium business customers every six months and every three months for large business customers. Transition Service Charges recover costs associated with electric industry restructuring. The filed Transition Service Charge has previously been approved by the M.D.T.E. to take effect June 1, 2006.

For information on how customers can conserve energy and control their energy costs, visit the Unitil web site at www.unitil.com or contact Unitil's customer service center at 888-301-7700.

Unitil Corporation (AMEX:UTL) at www.unitil.com is a public utility holding company with subsidiaries providing electric service in New Hampshire, electric and gas service in Massachusetts and energy services throughout the Northeast.

Contact
Stephanye Schuyler
schuyler@unitil.com