Systems that maintain sleeper cabs’ temperatures and “hotel loads” through use of fuel-cell technology and compressed natural gas are among new products being launched by Espar Products Inc.

Clean Energy Fuels Corp. and Mansfield Energy Corp. announced the formation of a joint venture that will provide natural-gas fueling to U.S. bulk-fuel haulers, a segment that consumes more than 3 billion gallons of fuel every year.

Bimbo Bakeries USA, the largest baker in the country, will begin using natural gas for some of its heavy-duty fleet in California.

Omnitek Engineering Corp. said it has received certification from the U.S. Environmental Protection Agency for diesel-to-natural-gas conversions of the Detroit Diesel Series 60.

Quantum Fuel Systems Technologies said it has partnered with Mainstay Fuel Technologies to offer a back-of-cab compressed natural-gas system for heavy-duty trucks.

Kenworth Truck Co. is adding a natural-gas option for its T880 vocational truck.

A proposal has been introduced in the U.S. Senate to give a weight exemption to trucks powered by natural-gas engines, which have heavier fuel tanks than those that run on diesel.

Interstate Distributor Co. signed an agreement to purchase 10 liquefied natural gas-powered Kenworth trucks after a demo program.

Clean Energy Fuels Corp., which provides compressed and liquefied natural gas, has completed and opened 27 natural-gas fueling stations in the first half of the year, the company said.