The Legacy Project

The Legacy renewable natural gas (RNG) project in Sanborn, Iowa, is a “new build” anaerobic digester on the Legacy Dairy Farm in Osceola County. The manure from this farm will produce renewable natural gas each year. After the anaerobic digestion project is operational, the gas generated will be captured, cleaned, and converted into RNG, which can be used as transportation fuel, industrial heating, and a host of other applications. Legacy is part of the third tranche of projects developed under the Brightmark RNG Holdings LLC joint venture with Chevron U.S.A. Inc. The project is expected to be completed in 2022.
This project has been a goal since our family relocated our dairy business to Iowa. We strive to be good neighbors and stewards of the environment, and we're looking forward to our anaerobic digestor contributing to the community and the farm.
Jeremy Van Ess, Family Owner/Operator, Van Ess Dairy and Legacy Dairy

Project Benefits

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GHG Reductions
The Legacy project is anticipated to prevent greenhouse gas emissions each year.
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Resource Recovery
The process of recovering and processing manure from the farms will prevent excess emissions from escaping into the local air and water.
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Waste To New Products
The facility will generate renewable natural gas each year. Other renewable products supported by the project include fertilizer and irrigation water.


In October 2020, Brightmark LLC and Chevron U.S.A. Inc. originally announced the formation of the Brightmark RNG Holdings LLC joint venture to own projects across the United States to produce and market dairy biomethane, a renewable natural gas. Equity investments by each company in the new venture fund construction of infrastructure and commercial operation of dairy biomethane projects in multiple states. Chevron purchases RNG produced from these projects and markets the volumes for use in vehicles operating on compressed natural gas.

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Our Projects

Transform Your Waste

Let’s team up and turn your farm waste into natural gas.

Curious brown cow in meadow during summer.