How do you drill for power? Do you mean oil? How can you say it's cheaper to drill and refine and deliver oil products than convert items back to their original state?
It is cheaper to drill for it. However, Exxon and other Big Oil companies, can't drill all the oil they need, in fact, they buy about half of their crude oil, at market prices.
It means there is a huge market for more domestic oil.
Also, oil from the Alberta Tar Sands, costs $31-$50 per barrel to produce, damn huge market for it. The most recent I found was $37, my link no longer works so this will have to do.