Graeme Wall wrote:
As I say, the electric buses here seem to manage a full day on a fairly
intensive service without needing more than an overnight charge at the
depot.

It's certainly feasible to have 100% battery buses. They are just very
expensive, and hence why they only show up when subsidised - Stagecoach,
First et al are not buying them as the natural option instead of diesel
buses. China has made good progress in this area, but with heavy government
subsidies.

It's a tradeoff whether more fixed infrastructure (charging at bus stations,
route wiring) costs less than larger batteries in vehicles. I suspect that
will depend on a case-by-case basis.

Theo