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855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 229

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EAc3: Enhanced Energy Efficiency only uses the future source energy metric and does not use energy cost, site energy, or source energy metrics (See EAc3: Enhanced Energy Efficiency, Option 2).

Energy modelers can limit the documentation level of effort by calculating both prerequisite and credit compliance using the future source energy metric.

OPTION 1. ASHRAE 90.1-2019. APPENDIX G PRM, ALTERNATIVE METRICS

  • Future source energy . Calculate the PIT for both the prerequisite and EAc3: Enhanced Energy Efficiency with BPFs from the prerequisite Table 1. 90.1-2019, Equivalent Building Performance Factors for a Future Source Energy Metric.

  • Site energy or source energy metric . (Prerequisite only). Apply ASHRAE 90.1-2019, Addendum ch for a source energy metric matching those listed in Addendum ch, Table X4-1, follow Addendum ch, Section X5, Methodology for BPF Adjustment To Account for Localized Conversion Factors.

OPTION 2. ASHRAE 90.1-2022. APPENDIX G PRM, ALTERNATIVE METRICS

  • Future source energy metric . Calculate the PIT for the prerequisite with BPFs from the prerequisite Table 2. 90.1-2022, Equivalent Building Performance Factors for a Future Source Energy Metric.

o Core and shell projects . Use the same BPFs to document the prerequisite and

EAc3: Enhanced Energy Efficiency.

o New Construction projects . Calculate the less stringent PIT for EAc3: Enhanced

Energy Efficiency using Table 6. 90.1-2019 equivalent building performance factors for a future source energy metric.

o Site energy or source energy metric . (Prerequisite only). Apply ASHRAE 90.1-

2022, Informative Appendix I. For the source energy metric, use the 90.1-2022, Appendix I5. Methodology for BPF Adjustment to Account for Localized Conversion Factors if the project source energy conversions do not match those listed in Addendum Table I4-1.

Appendix G PRM. Treatment of On-site Renewable Energy

OPTION 1. ASHRAE 90.1-2019 PRM. TREATMENT OF ON-SITE RENEWABLE ENERGY

Per ASHRAE 90.1-2019, Section 4.2.1.1, the renewable energy contribution towards meeting PRM requirements is limited to 5% of Baseline Building Performance.

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 219

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