A press release announcing the pricing of the Offering (as defined below) is attached as Exhibit 99.1 to this Current Report on Form 8-K.

On May 20, 2009, Unitil Corporation ("Unitil") entered into an underwriting agreement (the "Underwriting Agreement") with RBC Capital Markets Corporation, as representative of the several underwriters named therein (the "Underwriters"), relating to the sale of 2,400,000 shares of Unitil's common stock, no par value (the "Common Stock"), at an initial public offering price of $20.00 per share (the "Offering"). Unitil also granted the Underwriters a 30-day option (from the date of the Underwriting Agreement) to purchase up to an additional 360,000 shares of Common Stock to cover any over-allotments (the "Over-Allotment").

The Offering closed on May 27, 2009. Unitil used approximately $39.1 million of the net proceeds from the Offering to repay all amounts outstanding under the bridge credit facility that Unitil used to partially finance the acquisition of Northern Utilities, Inc. and Granite State Gas Transmission, Inc., which closed on December 1, 2008, and the related costs and expenses. Unitil will use the remaining net proceeds from the Offering and the net proceeds from any Over-Allotment for other general corporate purposes, including capital contributions to Unitil's distribution utilities and repayment of short-term debt.

The Common Stock was and is being offered and sold pursuant to shelf registration statements on Form S-3 (File Nos. 333-152823 and 333-158537) filed with the U.S. Securities and Exchange Commission (the "Commission"). The terms of the Common Stock are set forth in the prospectus filed May 21, 2009 with the Commission pursuant to Rule 424(b)(5) under the Securities Act of 1933, as amended.

The foregoing description of the Underwriting Agreement is qualified in its entirety by reference to the full text of the Underwriting Agreement, which is filed herewith as Exhibit 1.1 to this Current Report on Form 8-K.

(d) Exhibits

Exhibit No.   Description

1.1           Underwriting Agreement dated May 20, 2009 between Unitil Corporation and
              RBC Capital Markets Corporation, for themselves and as representative of
              the several underwriters named therein.

99.1          Press Release dated May 21, 2009.