Transportation is the largest source of U.S. climate pollution, and while passenger electric vehicles sales are accelerating, heavy-duty vehicles (HDVs) lag behind. New Energy Innovation research finds falling battery costs mean electric HDVs could reach cost parity with diesel counterparts years earlier than expected– four of five vehicle classes could be on par with or cheaper than diesel counterparts by 2030. Speeding up the transition to electric HDVs– made possible by improving economics– will create major public health and climate benefits, particularly in environmental justice communities.