Gresham, Oregon Wastewater Treatment Plant Hits Net-Zero Energy

Gresham net zero energy from biogas

The City of Gresham Wastewater Treatment Plant (water resource recovery facility) achieved its first net-zero energy consumption day on February 12, 2015. All of its electricity is produced from onsite renewable power. Approximately 95% is produced from two cogeneration CAT engines fueled by biogas (the facility increases biogas production from codigestion of fats, oils and grease). Approximately 5% of the energy comes from a 420-kilowatt solar electric system.

The City of Gresham Wastewater Treatment Plant is a featured site tour at BioCycle West Coast Conference 2015.

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