> most of the savings come from not wasting power while braking That doesn't check out for me. ICE engines are inefficient because much of the energy from the

> most of the savings come from not wasting power while braking That doesn't check out for me. ICE engines are inefficient because much of the energy from the fuel is converted into heat rather than kinetic energy. Every ICE engine has a radiator whose sole purpose is to vent off waste heat from the engine. ICE engines don't even need a distinct heating element to keep the cabin warm, the waste heat from the engine is more heat than the cabin will ever need. I don't know that much about how power stations work, but surely it is not this inefficient. EDIT: Did a bit of reading on gas/coal power plants and it sounds like they are indeed very inefficient: as bad as 20 percent, as good as 60 percent: https://www.energy.gov/fecm/how-gas-turbine-power-plants-work https://www.energy.gov/fecm/how-gas-turbine-power-plants-wor... That is mildly horrifying.