855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 315
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Option 2. Energy Simulation (1–10 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_
- Replace _ASHRAE 90.1-2019 or 90.1-2022_, Table 4.2.1.1, Building Performance
Factors (BPF), with Table 5 below. For major building renovation areas, multiply the BPF by 1.05.
- Replace all references to cost with future source energy. Use an electric site-tosource 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 in the LEED reference guidance.
- Calculate the performance index (PI) and percentage improvement with and without
the plug and process savings.
- Calculate the PI and PI target as follows:
- PI _nre_ = PBP _nre_ / 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
U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 305