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It is possible to generate electricity from sources other than fossil fuels.

It is not possible to drive a combustion engine from sources other than fossil fuels (except in very rare circumstances).

Removing fossil-fuel burning cars from the road reduces the national fuel burden, making the generation of electricity cheaper.

How much electricity is generated from gasoline?

Or petroleum?

Yeah we totally need more heatwave causing emissions right now guy

Many pieces of critical infrastructure (hospitals, for example) have enormous backup diesel generators, for one.

Key term in your comment bein 'back-up'.