I helped a friend set up a Micro Hydro Power generator in his stream, we used junk lying around his yard to build most of it and a modified washing machine motor as the generator.
He can now run all the appliances in his house for free, no power bill.

Free hydro power from water series-
Part 1-    • Lifetime of Free Power from Water - B...  
Part 2-    • Lifetime of Free Power from Water. Pa...  
Part 3- Washing machine stator rewire vid-    • Free Power from Water Part 3- Rewirin...  
Part 4- Wiring and programming the plc -    • Free Power from Water - Using an anal...  

Array Programmable logic controller from MasTec NZ - https://www.mastec.co.nz/