Check the article in the "technology has changed" post below. I suspect at this point the technology is giving them trouble, but if so, they're not talking about it.

James Brown mentioned the energy balance, and since he posted that, I've looked into it some more, and the "in situ" approach being used by the Mahogany project does need a lot of electricity.

In terms of oil supply, unless I see some new information, I am leaning toward putting this into the same category as making fuel from coal. It works, and enhances domestic supply, but it's not an efficient long-term approach. Obviously, the emission burden of this fuel depends on the source of the electricity.