Similar devices

After searching through the internet for anything to do with hydro power generation for your home, the only things I i could find were small hydro power dams for your backyard that relyed on streams, I found that people who had these were usually completly off the grid and relyed souly on their hydro dam to power their house. For my device i want to go on a much smaller scale and only power a smaller amount of your house instead of being the soul provider.