American Carbon Registry Standard

The American Carbon Registry (ACR) Standard details ACR’s requirements and specifications for the quantification, monitoring, reporting, verification, registration and issuance of project-based GHG emissions reductions and removals as carbon credits. The Standard establishes the level of scientific integrity that every project must meet in order for ACR to register its GHG emissions reductions and removals as tradable environmental assets.

ACR aims to maximize flexibility and usability for Project Proponents while maintaining the environmental integrity and scientific rigor necessary to ensure that projects developed against its standards and methodologies are recognized as being of the highest quality, whether used for voluntary or regulatory compliance purposes.

Adherence to the ACR Standard and associated methodologies and verification requirements will ensure that project-based offsets represent emissions reductions and removals that are real, additional, permanent, net of leakage, accurately and conservatively quantified, verified by a competent independent third party, and used only once.

Current version

• ACR Standard v7.0

Process documentation

• ACR Technical Standard 2009 v1.0
• ACR Standard v2.0 
• Summary of changes from v2.0 to v2.1
• ACR Standard v2.1
• Summary of changes from v2.1 to v3.0
• Public comments and responses on the update v2.1 to v3.0
• ACR Standard v3.0
• Summary of changes from v3.0 to v4.0
• ACR Standard v4.0
• ACR Standard Public Comments and Responses v4.0 to v5.0
• ACR Standard v5.0 Summary of Changes
• ACR Standard v5.0
• Summary of changes from v5.0 to v5.1
• ACR Standard v5.1
• Summary of changes from v5.1 to v6.0
• ACR Standard v6.0
• Summary of changes from v6.0 to v7.0
• Public comments and responses v6.0 to 7.0