Westport Innovations Inc. Offers Common Shares

published: December 8, 2009

VANCOUVER, BC — Westport Innovations Inc. (TSX:WPT, NASDAQ:WPRT) announced today that it is offering to sell, subject to market and other conditions, its common shares in the United States and Canada pursuant to a preliminary prospectus supplement to its base shelf prospectus dated July 28, 2009. Copies of the U.S. preliminary prospectus supplement can be accessed through the SEC's website at www.sec.gov, and copies of the Canadian preliminary prospectus supplement are available at www.sedar.com.

Jefferies & Company, Inc. is the sole book-running manager for the offering. Lazard Capital Markets LLC is acting as co-lead manager and other underwriters include ThinkEquity LLC and Craig-Hallum Capital Group in the United States and Dundee Securities Corporation in Canada. The common shares issued under the offering will be listed on The NASDAQ Global Market. Westport intends to make application to list the common shares issued under the offering on the Toronto Stock Exchange, which listing will be subject to fulfillment of all of the listing requirements of the exchange.

The offering will be made only by means of Westport’s preliminary prospectus supplement and accompanying short form base shelf prospectus. Copies of the United States preliminary prospectus supplement, when available, may be obtained from: Jefferies & Company, Inc., Equity Capital Markets, at 520 Madison Avenue, New York, NY, 10022, and by phone at (212) 284-2342 or 1 (888) 449-2342 or by fax request at (212) 284-2208.

Copies of the Canadian preliminary prospectus supplement, when available, may be obtained from Dundee Securities Corporation, 1 Adelaide St. E., Toronto, ON M5C 2V9, and by phone at (416) 350-3303 or by fax request at (416) 849-1380.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of the common shares of Westport in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction.

About Westport

Westport engineers the world's most advanced natural gas engines and vehicles. More than that, we are fundamentally changing the way the world travels the roads, rails and seas. We work with original equipment manufacturers worldwide from design through to production, creating products to meet the growing demand for vehicle technology that will reduce both emissions and fuel costs. To learn more about our business, visit westport.comsubscribe to our RSS feed, or follow us on Twitter @WestportDotCom.

Cautionary Note Regarding Forward Looking Statements

This document contains forward-looking statements, including statements regarding the demand for our products, the future success of our business and technology strategies, investment, cash and capital requirements, intentions of partners and potential customers, the performance and competitiveness of our products and expansion of product coverage, future market opportunities, speed of adoption of natural gas for transportation, growth in demand as a result of new emission standards and terms of future agreements. These statements are neither promises nor guarantees, but involve known and unknown risks and uncertainties and are based on assumptions that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activities, performance or achievements expressed in or implied by these forward looking statements. These risks and assumptions include risks and assumptions related to our revenue growth, operating results, industry and products, the general economy, conditions of and access to the capital and debt markets, governmental policies and regulation, technology innovations, fluctuations in foreign exchange rates, global government stimulus packages, the acceptance of natural gas vehicles in fleet markets, the relaxation or waiver of fuel emission standards, the inability of fleets to access capital or government funding to purchase natural gas vehicles, the sufficiency of bio methane for use in our vehicles, the development of competing technologies as well as other risk factors and assumptions that may affect our actual results, performance or achievements or financial position discussed in our most recent Annual Information Form and other filings with securities regulators. Readers should not place undue reliance on any such forward-looking statements, which speak only as of the date they were made. We disclaim any obligation to publicly update or revise such statements to reflect any change in our expectations or in events, conditions or circumstances on which any such statements may be based, or that may affect the likelihood that actual results will differ from those set forth in the forward looking statements except as required by National Instrument 51-102.

More Information

Westport
(Investor Inquiries)

Darren Seed

Vice President, Investor Relations and Communications

T 604-718-2046

invest@westport.com

www.westport.com