The 42TWh/yr figure is on p2, Table 1, cell G10.
The issue is that Llewellyn has developed a near-religious belief that shuttering refineries will by itself be sufficient to power a fleet of electric cars. I have not found data to support that thesis. In fact, I have provided sufficient data in other threads to refute it.
A city of 250k people has not just residences, but also industrial and commercial sectors which each make up about a third of the market. So assuming the rest of your math is fine, Llewellyn's refinery uses as much electricity as a city of 83000 people.
Similarly, a refinery doesn't just produce gasoline for personal transportation. They also provide non-energy products, as well as the fuel that powers agriculture, industry, freight, and most mass transit. Llywellyn doesn't appear to "get it".
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