Not a lot of oil is used for power generation. Much of what is used is refinery "leftovers" like residual oil and petroleum coke. These are heavy hydrocarbons left over after products like gasoline and diesel have been removed from the crude oil.
Residential heating does take a very big piece of the pie either, but more than electric power generation.
Yeah, I knew that, even as I posted it...but there’s no reason for any oil be used for power generation.
I saw an article that grouped heating and power generation together te other day.