Add two more U.S. natural gas fueling stations to the domestic map -- and leave room for more -- Clean Energy Fuels Corp. said.

The company has started up stations in London, OH, and Valdosta, GA, and it's secured multiple fuel agreements for compressed natural gas (CNG) and liquefied natural gas (LNG) stations. The fueling stops are part of a national network for heavy-duty trucks that include Epes Transport System Inc.'s LNG-fueled trucks to transport goods for Lowe's distribution center in Valdosta, and for Raven Transport's LNG-fueled fleet in London.

Epes President Britt Colley said the company planned to "explore additional opportunities to deploy natural gas trucks throughout our operations in the eastern United States."

Meanwhile, in Pennsylvania, Clean Energy plans to upgrade and manage six existing Peco CNG fueling stations. The Peco utility would supply gas for its fleet vehicles. Peco CEO Craig Adams said the utility intends to expand CNG infrastructure throughout southeast Pennsylvania.

In California, local transit system expansions are underway for natural gas vehicles, according to Clean Energy. Included is a 10-year conversion process for West Covina, CA's Foothill Transit's 335 CNG vehicles. In Norwalk, CA, it also has a contract to build and operate a private station for the city's transit system, which has 14 CNG vehicles.

"Cities across America are making the switch to natural gas to fuel their fleets because it is fiscally responsible and better for the air we breathe," said Norwalk Director of Transportation James Parker. "Norwalk grasped the potential of CNG fuel early on."

Also in California, the Morongo Basin Transit Authority has retained Clean Energy to maintain a CNG fleet and operate a fueling station for its 28 NGVs. The authority estimated that it saves about $300,000 annually with NGVs versus operating gasoline- or diesel-powered fleets.

In Nevada, Clean Energy is maintaining two private CNG complexes for the Southern Nevada Regional Transportation Commission, which recently ordered 80 Ford E-450 CNG passenger-lift-equipped vehicles.