Loyd Ray Farms

Project Description & Co-Benefits:

Loyd Ray Farms is an 8,600-head feeder-to-finish swine operation located in Yadkinville, North Carolina.  Traditional waste management systems on swine farms store waste in open-air lagoons that affect the local and global ecosystem in the form of waste runoff, the release of greenhouse gases, and odor nuisances. In collaboration with Google Inc. and Duke Energy, the Duke Carbon Offsets Initiative (DCOI) has assisted in the design and implementation of a 7,600 cubic meter anaerobic digester that converts swine waste into methane, a potent greenhouse case, which is used to generate renewable energy on-site.


The project involves the capture of methane generated by the hog waste in an in-ground lined and covered anaerobic digester. The gas collected in the digester is used to fuel a on-site microturbine. From the digester, the liquid waste flows to an open-air basin where the wastewater is aerated to reduce the concentrations of ammonia and other remaining pollutants so that it can be reused for irrigation.  The innovative system at Loyd Ray Farms also greatly reduces the odor from the hog waste, thereby decreasing the impact on the surrounding community.


Beyond the direct benefits of waste-to-energy conversions, Loyd Ray Farms can serve as an example of how individual farms can reduce their waste stream from hogs while also producing a revenue stream through electricity and carbon offset sales.  There is potential to build digesters that serve multiple farms, thereby decreasing the cost to individual farm owners, and helping to address  North Carolina’s hog waste issues. Additionally, in collaboration with Duke University’s Pratt School of Engineering and the Nicholas Institute for Environmental Policy Solutions, the project has resulted in multiple publications and data collected.  The project will continue to support current and future research.

Student Involvement:

The DCOI arranges visits to the farm and provides guided tours to teach students about waste management, carbon offset generation, and renewable energy production.

Charles Adair provides an explanation of the project site to a group of Duke students.

Charles Adair provides an explanation of the project site to a group of Duke students.

Flaring of methane gas collected at the project site.

Flaring of methane gas collected at the project site.

Contact Info (of project organizer):

Nathanial Colbert-Sangree, Program Coordinator, the Duke Carbon Offsets Initiative

nathanial.colbert.sangree@duke.edu, 919-660-1413

Project Status:

Active (2011-Present)

Offset Registry or Program:

Climate Action Reserve

Protocol Applied:

Climate Action Reserve: U.S. Livestock Project Protocol

Cost per Offset ($ per mtCO2e): 


# of Total Offsets:

Estimated to be 2,000-3,000 offsets per year

Website: Loyd Ray Farms