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Clean Energy Fuels Corp. said it will purchase two liquefied natural gas plants from General Electric Co. as part of a new partnership between the two companies to develop LNG fueling infrastructure for the trucking industry, the firms announced last week.

FedEx Freight said it has begun testing two tractors powered by liquefied natural gas.

CINCINNATI — A Volvo Trucks executive described natural gas as a significant “windfall” for the United States, and a manufacturer of natural gas fuel systems said truck buyers must parse a host of fine details before purchasing a vehicle.

American Trucking Associations said its “Natural Gas in Trucking” summit meeting has sold out, and there is a waiting list of 20% beyond capacity for the Nov. 28-30 event in Arlington, Va.

EcoDual LLC, a manufacturer of diesel-to-natural gas conversion systems for heavy-duty trucks, is expanding distribution by partnering with truck repair and service company W.W. Williams Co., the companies said.

ATLANTA — T. Boone Pickens renewed his call to convert the nation’s 8 million heavy-duty trucks from diesel fuel to domestically produced natural gas and criticized leaders from both major political parties for not having the “guts” to pass legislation providing tax incentives to help buyers cover the higher cost of the trucks.

Trucking’s growing use of alternative fuels was the focus of separate announcements by Florida companies last week to increase fueling options and the number of compressed natural gas tractors on the road.

With natural gas use increasing as a transportation fuel, energy companies are moving to export more of the fuel from the United States as they search for more profitable markets, the Wall Street Journal reported Friday.

Virginia Gov. Robert McDonnell (R) signed an agreement with Clean Energy Fuels Corp. to allow state and local entities to buy compressed natural gas from Clean Energy for their vehicle fleets.