The secondary costs of running a diesel fleet are also huge! Diesel motors generate a substantial amount of fine particulate that is unhealthy for anybody, and particularly unhealthy for children. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC121970/ Even if an electric fleet is the same cost, changing over would save tons of money and alleviate tons of suffering. It's the right thing to do for any ethical reason you…
So if a district can outsource part of that maintenance cost, and electric buses prove to be lower maintenance and more reliable that their diesel counterparts, there are significant savings to be had for the school districts.