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Supporters of a national network of natural gas fueling stations for motor carriers have invested an additional $150 million in the project, Clean Energy Fuels Corp. said Thursday.

Daimler Trucks North America said it has delivered its 1,000th truck powered by natural gas and added it was the first commercial vehicle manufacturer to reach that mark.

Southern California Gas Co. plans to add about 1,000 new natural-gas-powered trucks to its fleet over the next five years.

WASHINGTON — Natural gas holds a great deal of promise for the trucking industry as an alternative to diesel, but with the hurdles of infrastructure and costs, it’s rarely a viable option currently, trucking stakeholders said.

Clean Energy Fuels Corp. announced it has partnered with Mid-Atlantic fleet fueling station operator Quarles Petroleum to add natural gas fueling services at several Quarles locations.

Love’s Travel Stops & Country Stores said it will add 10 compressed natural gas fueling stations at existing locations in Oklahoma.

Ryder System said that UBCR LLC has selected it as a partner in a Michigan natural gas project that will put 16 more heavy-duty natural gas trucks on the road.

Refrigerated carrier C.R. England Inc. said it was introducing its first trucks that run on liquefied natural gas, to be operated out of its Ontario, Calif., dedicated operation division.

Clean Energy Fuels said Monday it has signed a 10-year contract with third-party logistics provider Saddle Creek Transportation to build, operate and maintain a new compressed natural gas truck fueling station at Saddle Creek’s Lakeland, Fla. headquarters.

LAS VEGAS — The abundance of natural gas in the United States provides a significant opportunity for trucking to lower fuel costs and carbon emissions, although several significant hurdles remain, an official with American Trucking Associations said.