Brightmark Energy, a San Francisco-based waste and energy development company, recently launched a biogas project in Yakima County, Washington, that will convert 150,000 gallons per day of dairy waste from up to 7,000 cows into 160,000 MMBtu of renewable natural gas (RNG) – the equivalent of 1.4 million gallons of gasoline – and other products each year. Collaborating as Augean Renewable Natural Gas (RNG), Brightmark Energy, Promus Energy, and DeRuyter Dairies developed the project. Brightmark Energy will manage the joint venture and Promus Energy, the original developer, will serve as the project manager.

A key component of the Augean project is the construction of new pipeline infrastructure by Yakima County and Augean that sets the table for RNG projects for other dairies in the area. The Augean project will collect biogas from DeRuyter’s anaerobic digester fueled exclusively by manure. The raw biogas will be cleaned, upgraded, and compressed into pipeline quality RNG, which will be transported through the new pipeline system and injected into the nearby Williams NW regional gas transmission line for sale as vehicle fuel. In addition to RNG, other renewable products generated by Augean’s anaerobic digestion process include biofertilizer, digested dairy fiber for use as cow bedding or as a peat moss substitute, and reclaimed irrigation water. More>>