April 30, 2020. The City of Phoenix Water Services Department announced that the Renewable Natural Gas (RNG) facility at the 91st Avenue Wastewater Treatment Plant received honorable mention in Fast Company’s 2020 World Changing Ideas Awards in the energy category. This facility is the largest wastewater treatment biogas-to-renewable natural gas facility of its kind in the United States.

The gas is a result of the natural breakdown of organic matter in the wastewater treatment process. Prior to this operation, the majority of this gas was burned off using flares. Through this new effort, 600,000 cubic feet of gas will be treated annually and transferred to a nearby commercial gas pipeline, where it will be sold on the open market as green energy.

The carbon-neutral RNG produced at this facility offsets approximately 44,671 metric tons of CO2 per year — the equivalent of taking roughly 70,452 passenger vehicles off the road for one year.

Now in its fourth year, the Wo​rld Changing Ideas Awards showcase how some of the world’s most inventive entrepreneurs and companies are addressing grave global challenges. A panel of eminent judges selected winners and finalists from a pool of more than 3,000 entries across transportation, education, food, politics, technology and more.