Revision to AMS-III.Y to Include Use of Organic Bedding Material

AMS-III.Y applies to project activities that avoid or reduce methane production from anaerobic wastewater treatment systems and anaerobic manure management systems, through the removal of volatile solids from the wastewater or manure slurry stream. The separated solids are further treated, used, or disposed in a manner resulting in lower methane emissions.

The proposed revision allows the use of separated solids as bedding material in barns, subject to animal and product hygiene safeguards. It also reinforces additionality requirements and adds clarifications to facilitate application by biofiltration projects.

The draft methodology is currently at “Step 6: Final Verra Review and Decision” of the VCS Methodology Development and Review Process (PDF).

Verra hosted a public consultation from 6 February 2026 to 9 March 2026.

Stakeholders interested in collaborating during methodology development or developing projects that this methodology might enable are encouraged to contact methodologies@verra.org. Please include the Methodology Development ID#M0370 in the subject line.