The city of Grand Junction in Colorado is turning its human waste into renewable natural gas (RNG) to power its vehicles. Eight million gallons of human waste is processed at the Persigo Wastewater Treatment Plant that turns the sludge into RNG or Biomethane. Alternative Energies reports: The RNG becomes the fuel used by 40 fleet vehicles like garbage trucks, dump trucks, street sweepers and even transit buses. The human waste is turned into raw biogas due to a process called anaerobic digestion, and to become RNG is collected and suffers a little upgrade in order to meet the quality requested, and only after is used to produce electricity, heat and transportation fuel. The idea to turn wastewater into biogas is not new in the U.S., but until now, the raw biogas was released into the atmosphere instead of being used to produce energy for the local community. Due to the fact that today the 40 fleet of vehicles is using RNG instead of gasoline or diesel, and some of the electricity and heat of the town is produced by RNG, the city managed to reduce the level of greenhouse gas emissions by 60% to 80%. The entire project is valued [...]