Work group, PNNL modeling explain large changes to C406 credit tables

Sep 29, 2026

Council members and work-group participants said PNNL modeled credit values used to update the C406 tables; members cautioned that some values appear large because prescriptive requirements were converted into point-credit equivalents.

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Council members spent substantial time discussing the C406 credit tables and the modeling behind revised point values. Participants and staff said PNNL (the modeling contractor) calculated the energy savings represented by each measure, and the work group reviewed those results to set point values.

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