In my hometown Guangzhou, China, the local government started to promote fully-electric buses (EVBus) in their public transportation in 2017.
By end of 2018, around 10,000 EV Buses are going around the city, connecting people from their community to MRT stations.
Most importantly, these EV bus reduced the CO2 emission and air pollution in Guangzhou. The people here can feel the different air quality in just 2 years time! Technology made it happen!
An interesting thing about why EV buses system can be upgraded in such a short time, because the longest public bus daily routine route is about 50km, 60 stops; therefore, the battery management of these buses can easily achieve such mileage.