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| Farm Type | Number of Digester Projects |
|---|---|
| Dairy | 98 |
| Swine | 19 |
| Caged layer | 3 |
| Duck | 2 |
| Broiler | 1 |
| Beef | 1 |
| Mixed | 1 |
In 113 of the 125 operational systems, the captured biogas is used to generate electrical power, with many of the farms recovering waste heat for the electricity generating equipment for on-farm use. These systems generate about 244,000 MWh of electricity per year. The remaining 12 systems use the gas in boilers, upgrade the gas for injection into the natural gas pipeline, or simply flare the captured gas for odor control.
In total, the combustion of biogas at the digesters prevents the emission of about 36,000 metric tons of methane annually (756,000 metric tons of CO2 equivalent). In addition, the combustion of biogas displaces the use of fossil fuels, thus achieving additional emissions reductions of greenhouse gases and air pollutants.
Many of the operational, planned and under construction digester systems
included in the database were funded in part by USDA Rural Development through
the 2002 and 2008 Farm Bills. Some of these Farm Bill funded projects
are highlighted in the Farm Project Profiles section below.
The Excel spreadsheets below provide basic information for anaerobic digester systems in the United States. The spreadsheets show projects in the following stages: planning, construction, operational, shutdown, and cancelled. Download XLS viewer. 
These data were compiled from a variety of sources. AgSTAR cannot guarantee the accuracy of these data. AgSTAR encourages farm operators, project developers, financers, and others involved in the development of farm digester projects to provide updates and corrections to these data by contacting AgSTAR.
Anaerobic digester systems can be installed successfully at commercial scale operations that collect manure as a liquid, slurry, or semi-solid. Existing farms use a variety of different types of digester designs and energy use technologies. Read profiles of successful anaerobic digester projects that are enjoying the environmental and economic benefits of incorporating anaerobic digesters into their manure management system.
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Guide to Anaerobic Digesters