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Unitil Files Energy Service Electric Rate Decrease for Large Business Customers in New Hampshire

Hampton, NH - (June 19, 2006): Unitil Corporation (AMEX:UTL) announced today that its New Hampshire retail operating subsidiary filed revised Energy Service prices for its large customers with the New Hampshire Public Utilities Commission. The new prices are based on a recently completed competitive bidding process for wholesale electric energy supply and are expected to be in effect August through October, 2006.

Large business customers who take Energy Service supply from Unitil will see average bill decreases of about 0.6%, reflecting a drop in electricity supply costs since last May. More than 40% of Unitil's large business customers in New Hampshire procure their own competitive energy supply and they will not be affected by the change in Energy Service prices.

The monthly Energy Service prices are as follows:

  August $0.09414 / kilowatt-hour
  September $0.07711 / kilowatt-hour
  October $0.08151 / kilowatt-hour

Energy Service is provided to customers who do not have their own retail competitive electricity supply. These services are procured by Unitil through a competitive bid process and the resulting prices are passed through to customers without profit or mark up from the local distribution company. Unitil's Energy Service prices are set every three months for large business customers and every six months (May and November) for residential and small to medium business customers.

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

Corporate Office
Liberty Lane West
Hampton, NH 03842-1720
800/999-6501