He claimed that the freezewall was actually a tiny percentage of the overall energy budget (they leave a significant gap between it and the heated zone). I wonder about what happens to the residual hydrocarbons after they've moved on the groundwater starts to come back in (given hydrocarbon recovery rate is presumably not going to be any better than it usually is for a conventional reservoir).

Air quality issues are going to depend on how they generate all that power. In fairness, Mut didn't present the 5mbpd figure as part of his presentation. It was an off-the-cuff remark when pressed by a questioner on how likely was the 10mbpd number the questioner had heard Washington types assuming could be done from oil shale by 2025. He said he couldn't imagine the basin ever handling 10mbpd, but he thought maybe just maybe 5mbpd. I think we can probably guesstimate that this is at a very high environmental price in Colorado and Utah. Whether that would stop us from doing it is not clear...

I think what the Swede's were doing was really near the surface, whereas Shell is proposing to do this under 1000' of overburden if I recall correctly.

The fact that this is more electricity than Colarado now uses, just to get 1mbpd of fluids, is certainly sobering. Welcome to the world of EROEI = 3.5...

From my talks with HO about this issue, we're looking at a multi-step process to get from here--basically nowhere--to there, not knowing what that last step looks like in terms of production or date vis-a-vis these "oil shales" (kerogen--immature hydrocarbons--in a marl rock geological context).

The point is this: each incremental step potentially (and almost certainly) involves new technical problems to be solved and therefore, this is simply not a good energy solution in any time frame we care about at this point. By the way, when people talk about "Swedes" here, it is my understanding that they should really be talking about the Baltic states (Estonians, Latvians...). Perhaps somebody will clarify this for me but that's what my research shows.
You are so right. A technology chain is as strong as it's weakest link.
Oh yeah, you can also use windmills to produce power for this shale oil heating technology, but that's not so good because it's not dependable power. You have to drill more holes so that they don't get overloaded when the wind blows. It takes time for heat to diffuse away from the shale near the heaters to the shale away from the heaters.