Westport Receives US EPA and CARB Certification of Heavy-Duty LNG Class 8 Truck Engine

December 4, 2007

(Vancouver, BC) -- Westport Innovations Inc. (TSX:WPT), a global leader in gaseous-fuelled power technologies, has received California Air Resources Board (CARB) and U.S. Environmental Protection Agency (EPA) certification for its High Pressure Direct Injection (HPDI) technology adapted to the 2007 Cummins ISX heavy-duty engine. The EPA certification and the Executive Order from CARB certifies the HPDI LNG (liquefied natural gas) fuel system to 0.8g/bhp-hr oxides of nitrogen (NOx) and 0.01g/bhp-hr Particulate Matter (PM).

CARB and EPA certification will provide further impetus to the plans of the Port of Los Angeles and the Port of Long Beach to replace many of the 16,800 heavy- duty trucks currently operating daily at the Ports with the Westport LNG engine and fuel system. Funding was approved 8 weeks ago for the first 158 of the new LNG vehicles.

Earlier in November, the Los Angeles and Long Beach Boards of Harbor Commissioners also voted to ban the oldest, dirtiest trucks from the Port of Los Angeles and Port of Long Beach, separately approving a tariff that will gradually limit access to all but the cleanest vehicles and reduce pollution by short-haul vehicles by 80 percent.

LNG fuelling infrastructure to support the new trucks is now under construction. "With the opening this month of the first of our three planned LNG truck fuelling stations for the Ports' initiative, and the completion of our California LNG production plant in 2008, Clean Energy is well-positioned to support the fuelling infrastructure needs of the goods movement industry in Southern California," said Andrew J. Littlefair, Westport Innovations director and CEO of Clean Energy Fuels Corp.

For more information: Jonathan Burke, Westport Innovations, www.westport.com, (604) 718-2046 or invest@westport.com.