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On November 4, 2025, the AER released AERH2S model for determining emergency planning zones (EPZ) for all sour well and pipeline applications. AERH2S is an updated and renamed version of the AER’s existing model, ERCBH2S, first released in 2008.
AERH2S is available for use immediately. However, the AER have adopted a phased implementation for the release of the revised model. Until further notice, use of AERH2S is optional for Directive 071: Emergency Preparedness and Response updates to EPZs established before January 1, 2026. ERCBH2S remains effective, available, and accepted by the AER for existing EPZs. The use of AERH2S under Directive 071 is required for any Directive 056 applications made after January 1, 2026, including amendment applications.
The AER have also released an updated technical reference document and user guide. The AERH2S model and the support materials are available on the AER website under Systems and Tools. There have been no updates to the CAPP guidelines, and CAPP Guideline: H₂S Release Rate and Audit Forms (July 2012) remains current.
Additional information can be found in Bulletin 2025-34
At Benoit Regulatory Compliance, we prepare H₂S Release Rate Reports and EPZ calculations for new well applications, ensuring full compliance with AER requirements. Our team works closely with operators to deliver clear, reliable reports to keep projects moving forward without delays.
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