Likely for the same reason Tesla was really, really expensive until now and is just reasonably expensive now with model 3. The initial investment plus extra fun

Likely for the same reason Tesla was really, really expensive until now and is just reasonably expensive now with model 3. The initial investment plus extra funds to build charging infrastructure is likely the reason why we cannot have it yet. Also, if you think about it, each school bus might not be driving enough miles to make up for the cost of conversion.