The Augean Renewable Natural Gas (RNG) project in Yakima County, Washington, will convert 150,000 gallons per day of dairy waste from up to 7,400 cows at George DeRuyter & Sons Dairy into 160,000 MMBtu of RNG each year – the equivalent of 1.4 million gallons of gasoline. Brightmark’s investment in the Augean project enables DeRuyter to upgrade its 2007 manure collection system and digester to increase its capacity. A key component of the project is the construction of new gas pipeline infrastructure that sets the table for RNG projects for other dairies in the area.

“On day one after the digester upgrades were complete, we were out there emptying manure ponds to turn that waste back into useful products and to recycle nutrients. We’re glad for the opportunity to lead the way for others in the industry in this arena.”

– Dan DeRuyter, co-owner of DeRuyter Dairies

Project Benefits

GHG Reductions
The facility will offset approximately 50,000 metric tons of greenhouse gas emissions each year.

Resource Recovery
Renewable products generated by the project include biofertilizer, digested dairy fiber for use as cow bedding or as a peat moss substitute, and reclaimed irrigation water.

Cost Savings
The project is expected to save DeRuyter Dairies more than $500,000 each year in operations and environmental compliance costs.

Water Conservation
The project is expected to reduce water inputs for manure flushing by more than 25 million gallons of water each year.

Project Locations

  • GDR and D&A Dairy – Outlook, WA


Brightmark, Promus Energy, and DeRuyter Dairy developed the project. Brightmark manages the joint venture and Promus Energy is the project manager. The project is also supported by a $1.4 million grant from Yakima County and a $500,000 Rural Energy for American Program (REAP) grant from the U.S. Department of Agriculture.

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