In 2018, SEDAC performed an energy assessment for the Herrin IL Wastewater Treatment Plant (WWTP). The assessment identified several energy cost savings measures to reduce energy and utility costs. Most recommended measures focused on variable frequency drives (VFDs) for five 25 HP influent pump motors, four 20 HP effluent pump motors and lift station pump motors. After the assessment, operators made several improvements to the plant based on our recommendations.