The city of Boulder has signed an agreement with Western Disposal for the sale of renewable natural gas produced by a new system at the city’s Water Resources Recovery Facility (WRRF). The biomethane will fuel up to 38 of the 56 commercial vehicles Western Disposal uses to serve Boulder and Broomfield Counties, after its injection into the Public Service Company of Colorado (PSCo) pipeline. This is expected to reduce transportation-related CO2 emissions by more than 2,700 metric tons per year.
“Reducing emissions from the transportation sector is one of the key priorities in our local climate efforts, and the city of Boulder is working more closely than ever with business leaders to pursue the many diverse approaches for reducing emissions,” said Jonathan Koehn, chief sustainability and resilience officer at the city of Boulder. “The transition to renewable energy is taking many forms, and utilizing the renewable natural gas created locally will decrease our reliance on fossil fuels and provide important clean air benefits.”
“Western Disposal was one of the first waste haulers in Colorado to convert from diesel to compressed natural gas for its vehicle fleet, and this partnership with Boulder to use its renewable natural gas is another step forward in reducing our carbon emissions,” said Mike Seader, vice president of operations at Western Disposal. “We’ve been serving Boulder and the surrounding communities for 50 years, and we are absolutely committed to being a key partner in helping the community meet their climate goals.”
For the development of the new biogas-to-renewable natural gas conditioning system, the city of Boulder has partnered Tetra Tech and CGRS, Inc. Tetra Tech is providing engineering, procurement and construction (EPC) services to the city, while CGRS is the general contractor and design-build partner, overseeing and performing the majority of on-site construction work. The Biogas Use Enhancement Project is expected to be completed in July 2020.
The project will replace the WRRF’s cogeneration system, which is at the end of its useful service life, with a new digester gas upgrading system. The work includes installing a BioCNG™ gas conditioning system, demolishing the existing cogeneration engines and heat recovery systems, installing one new boiler, and upgrading the hydronic system used to heat the digesters and other buildings.
Source: City of Boulder/CGRS