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TAG approves combined ERI pathway proposal; asks modelers to refine renewables cap and envelope backstop
Summary
The TAG approved a combined Energy Rating Index (ERI) compliance option adapted from the 2024 IECC, agreeing on local limits for how much on‑site renewables can count and asking PNNL to model final ERI targets; the group also debated a thermal envelope backstop and third‑party QA for ratings.
The Washington State Residential Energy Code TAG voted June 27, 2024, to approve a combined ERI compliance proposal that adapts 2024 IECC language to Washington State code and establishes local rules for on‑site renewables and envelope tradeoffs. The approval was unanimous after extensive discussion about renewable caps, how on‑site renewable energy certificates (RECs) can be used, and quality assurance for ERI raters. Why it matters: The ERI path is a performance option that allows builders to meet code using modeled whole‑house energy performance rather than prescriptive measures. A clear ERI path that aligns with national standards but reflects state policy allows larger builders and national programs to operate in Washington while retaining local policy controls. Key outcomes and technical choices: - TAG approved the combined O33/O40 package (the TAG referenced the combined file as 040/033) and directed staff to include the changes in public materials. The group's…
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