EST 204 builds off of EST 201, EST 202, and WTM 205 by focusing on the use of waste products to produce energy. Many landfills and wastewater treatment facilities are re-purposing themselves as net producers of clean water and renewable energy. They now consider their plants to be Renewable Resource Recovery Operations that utilize low-cost feedstocks to generate power, heat, and fuels to lower their operating costs and/or generate revenue. Prerequisites: EST 201, EST 202, and WTM 205. Co-requisite: EST 203.