855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 230
Extracted Content
This varies from EAc3: Enhanced Energy Efficiency, Option 2, which either includes or excludes the entire renewable contribution from the determination of credit compliance.
OPTION 2. ASHRAE 90.1-2022 PRM. TREATMENT OF ON-SITE RENEWABLE ENERGY
Per ASHRAE 90.1-2022, Section 4.2.1.1 , the modeler must perform three calculations of proposed building performance to account for the renewable energy contribution prescriptively required in Section 10.5.1 Renewable Energy Resources:
-
Proposed building performance without any credit for the on-site renewable energy contribution.
-
Proposed building performance including the on-site renewable energy contribution prescriptively required from Section 10.5.1.
-
Proposed building performance including all on-site renewable energy contributions.
The renewable energy contribution toward meeting PRM requirements over and above the amount prescriptively required from Section 10.5.1 is limited to 5% of baseline building performance.
This varies from EAc3: Enhanced Energy Efficiency, Option 2, which either includes or excludes the entire renewable contribution from determination of credit compliance.
Appendix G PRM. Exceptions to Mandatory Measures
For mandatory measures, the modular may document the associated savings in the energy simulation and account for the measure’s absence instead of complying with the mandatory provisions. Model the Baseline Building Performance (BBP) per Appendix G requirements and the Proposed Building Performance (PBP) as designed for measures that are not required for inclusion in the BBP, such as daylighting controls. For measures where Appendix G requires the PBP to match the BBP, model the measure as present in the baseline BBP and absent in the proposed PBP.
ECB and Appendix G PRM. Building Envelope Backstop
New buildings using the Energy Cost Budget (ECB) Method or the Appendix G Performance Rating Method (PRM) must limit building envelope trade-offs per ASHRAE 90.1-2019, Addendum cr or the associated requirements embedded in ASHRAE 90.1-2022 . Doing so prioritizes building envelope performance that has a lifetime impact over more short-lived efficiency measures.
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 220