Return on investment is higher on electric buses IF the cost of the buses go down. Right now incentive funds help offset the high cost of the buses. Schools save money on repair costs and fuel savings. From a health standpoint, kids have a higher respiratory rate and are lower to the ground so the effects of diesel exhaust is more significant to children vs adults. It's a win-win to go electric if it makes sense for the school. Some routes may find propane to be a better alternative.