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/