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@TheBrick(Tommy)
"how much greener is electricity vs. petrol/diesel?"
One thing is that a car engine is not running at is's optimum most of the time, while a power station, even though using coal (and sometime big jet engines on back up generators to cope with power surges like football matches tea time e.t.c) can be kept closely monitored and run more efficiently, the combustion can be slowly increased rather than revved up all of a sudden e.t.c plus due to the close contorl you can make sure you are getting as compleat a combustion as possible.