According to the American Public Transit Association, alternative fuels and advanced hybrid drivetrains powered more than half of all transit buses in the USA in 2017 and 2018.
In the 10-year period from 2008 to 2018, the share of conventional diesel-powered buses dropped from 70% to 42%. Natural gas and diesel-hybrid drivetrains have replaced the greatest share of diesel buses followed by biodiesel and other buses, which include hydrogen, electric, and propane.
Source: American Public Transportation Association, 2019 Public Transportation Fact Book, Washington, DC, April 2019, Figure 14.
