A silent revolution is underway on city streets as transit agencies large and small replace noisy, polluting diesel buses with clean, quiet electric vehicles. But agencies and bus manufacturers alike warn that the transition is not as simple as signing a procurement order for new battery-powered buses.

The number of battery-electric transit buses (BEBs) currently on order or operating in the U.S. grew 112% from 2018 to 2021 according to data compiled yearly by Calstart. California leads the nation with almost 1,400 on the road or on order, followed by Washington, New York and Florida. A much smaller number of fuel-cell electric buses are out there, and their numbers are growing as well.

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