Natural gas vehicles can run on either compressed natural gas (CNG) or liquefied natural gas (LNG). LNG and CNG fueling infrastructure has grown over the past several years, and recently, companies in the private sector have announced plans to invest in infrastructure and new technology.

Currently, the vast majority of vehicles that use natural gas are powered by CNG, and over 900 of these fueling stations exist in the United States, with more than 50 percent restricted to private access only. The state with the most CNG fueling stations is California with more than 200, followed by New York with more than 100. Most of the 45 LNG fueling stations in the U.S. are also located in California. CNG stations reached levels greater than 1,400 in the late 1990s. Since then, the largest declines have occurred in Georgia, Texas, Ohio, and New Mexico, while California and New York have seen increases. The General Electric Company, Chesapeake Energy Corporation, and Clean Energy Fuels Corporation each recently announced initiatives to expand natural gas vehicle fueling infrastructure