This wooden shed in the woods contains a micro hydro-electric scheme to power the Field Centre at Low Gillerthwaite. Apparently it had previously used diesel generators. I'd guessed what it was because I could hear it humming but inspection revealed a pipe coming in down the hill which joins in the middle photograph. Then we found the outflow in the bottom photograph. It said 1000V AC on the door. Internet research shows that it generates 5kW at peak flow. That's basically 2 kettles at once! At peak flow it would be 5A at the generator. Thinking about it, since output emf is proportional to rate of flux cutting, you'd only get 1000V when it was turning fastest. I've never really thought about these naturally powered generators producing different voltages at different times. That will some research. If you want more details on this scheme, try http://www.bre.co.uk/renewabletechnologies/filelibrary/casestudies/Low_Gillerthwaite_Field_Centre.pdf
