Here's how it works. Wastewater, including solid sewage, travels to the plant, where the liquid is separated out and sent to a traditional wastewater treatment plant. The solids that are left over are heated, sterilized, and mixed into an easily digestible mass. That mixture is then sent into a digester, where a certain mix of microbes chows down on the waste, producing methane as they digest their meal. That methane is then burned and used to generate about 10 megawatts of electricity.