LEED v5 BD+C Rating System_November 2025_clean - Page 113

Extracted Content

Option 2. Energy Simulation (1–7 points)

Demonstrate an improvement in future source energy calculated per ASHRAE Standard 90.1, Normative Appendix G, Performance Rating Method, with the following additional provisions:

• Use the ASHRAE 90.1 version applied for EAp2: Minimum Energy Efficiency .

o Case 1 . ASHRAE 90.1-2019 . Replace ASHRAE 90.1-2019, Table 4.2.1.1, Building

Performance Factors, with Table 4. For major building renovation areas, multiply the BPF by 1.05.

o Case 2 . ASHRAE 90.1-2022 . Replace ASHRAE 90.1-2022, Table 4.2.1.1, Building

Performance Factors, with Table 5. For major building renovation areas, multiply the BPF by 1.05.

• Replace all references to cost with future source energy. Use an electric site-to-source energy conversion factor of 2.0 based on future projections for the U.S. A lower national average value may be used as applicable for projects outside of the U.S.

• Model energy efficiency measures for plug and process loads using the Section G2.5 exceptional calculation method or approved calculations. Calculate the PI and percentage improvement with and without the plug and process savings.

• Calculate the PI and PI Target as follows:

  • PInre = PBPnre / BBP

  • PI = PBP / BBP

  • PIt = [BBUE + (BPF x BBRE)] / BBP where:

o PInre = performance index for future source energy excluding on-site

renewable contribution

o PI = performance index for future source energy including on-site renewable

contribution

o PIt = performance index target for future source energy use

o BBP = baseline building performance for baseline building future source

energy use

o BBUE = baseline building unregulated future source energy use

o BBRE = baseline building regulated future source energy use

o PBPnre = proposed building performance without any credit for reduced

annual future source energy from on-site renewable energy generation systems

o PBP = proposed building performance, including the reduced annual future

source energy associated with all on-site renewable energy generation systems

Points are awarded according to Table 8, using either Path 1 or Path 2.

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, November 2025 Edition 106