Clean Energy Fuels has secured a $40m contract from Dallas Area Rapid Transit (DART), US, to design and build four new compressed natural gas (CNG) stations to support new CNG-powered bus fleet.

The new Clean Energy CNG fueling stations will be located at DART’s bus and paratransit maintenance facilities.

Clean Energy will begin the fueling station development project in May 2011 and expects to complete the first facility by April 2012.

Over the next three years, the agency plans to deploy 452 new CNG buses and 200 CNG paratransit vehicles as replacements for its current fleet of liquefied natural gas and diesel-powered models that began service in 1998.

Costing less than diesel, natural gas fuel produces up to 23% lower greenhouse gas emissions in medium to heavy-duty vehicles, the company said.