Direct Mechanical Hydropower
In most “developed” countries, electrical power is relatively cheap, widely available, of high capacity, and reliable. This is not the case in many other parts of the world – where low power, expensive and unreliable supplies are the norm.
I see some people here have talked about using gasoline engines, or even human pedal-power, to get around this problem. However, in many countries thare has been a very long history of using small scale water power for tasks such as grinding corn. The power requirement of a small mill is probably of the same order of magnitude as that required by the Precious Plastic shredder.
Read this aricle about the advantages of using direct hydropower. Maybe it could be an alternative source of mechanical shredding power where you live.