The Sheboygan Regional Wastewater Treatment Plant (WWTP) produces 75-80% of its energy needs on site from renewable energy, reports Sharon Thieszen, Plant Superintendent. The plant utilizes the biogas produced from its anaerobic digestion of municipal sludge generated in the wastewater treatment process in a combined heat and power generation process. With over 700 KW of generating capacity and the ability to produce approximately 2.4 million BTU of heat per hour, the Sheboygan Regional WWTP can produce 75-80% of its electrical energy and 85% of its heat requirements annually. At peak gas production, the plant can actually generate more energy than it uses, and is able to sell the additional electricity back to the grid.