Electric Bus Market Forecast to 2028 - COVID-19 Impact and Global Analysis By Vehicle Type (Battery Electric Bus, Hybrid Electric Bus, and Plug-In Hybrid Electric Bus), Hybrid Powertrain (Series Parallel Hybrid, Parallel Hybrid, and Series Hybrid), Battery (Lithium Iron Phosphate (LFP) and Lithium Nickel Manganese Cobalt Oxide (NMC)), and End User (Public and Private)