Sorry about being off-topic, as far as using a SBC for an industrial engine, but I think a few people here might find this interesting, and maybe even useful. A while ago, I found these plans to make a personal hydroelectric generator. I've not built one myself, so I don't know how well it works.
I uploaded the PDF file to my Microsoft OneDrive (formerly SkyDrive) account. If you can't view or download it, let me know and I'll find another way to get it to you.
Here's the link:
http://1drv.ms/1szGeJi