Well, I asked him and he's quite positive on anaerobic digester use for electricity. He's not well informed on bitcoin or mining though.

I'd love to know the portion of time these guys sell back to the grid vs mining, and how much that might change as this becomes more and more prevalent.

Then again, the UK (where this farm actually is), doesn't seem too well set up to produce cheap electricity anytime soon, unless they really get their shit together, so it could be viable approach for years to come.