855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 192

Extracted Content

• Energy costs can fluctuate due to market conditions, subsidies, and other economic factors, skewing the representation of the environmental footprint of energy use for the cost metric.

• A site energy metric overemphasizes the decarbonization already credited under EAc1: Electrification .

  • A GHG emissions metric overemphasizes the decarbonization already credited under EAc1: Electrification and EAc3: Renewable Energy .

Building Performance Factor (BPF) For substantial alterations and initial buildouts, Performance Index Target (PIt) must be calculated using LEED-published BPFs from the rating system Table 7, which are derived for a future source energy metric based on ASHRAE 90.1-2019 equivalent performance. For projects that document prerequisite compliance using ASHRAE 90.1-2022, this directly rewards the differential future source energy savings from ASHRAE 90.1-2019 to ASHRAE 90.1-2022 .

For substantial alterations, multiply the LEED-published BPFs by 1.05 for the proportion of existing project area associated with each building area type.

BPFs are not used for other alterations of existing buildings. Refer to the EAp2: Minimum Energy Efficiency guidance for further context.

Treatment of on-site renewable energy (Option 2. Energy Simulation) The Performance Index Target (PIt) for EAc2: Enhanced Energy Efficiency omits the ASHRAE 90.1-2022 4.2.1.1 “PRE” adjustment for prescriptively required on-site renewable energy, matching the ASHRAE 90.1-2019 equation for PIt:

× t PI = [BBUE + (BPF BBRE)] / BBP

To determine the PI, either fully exclude the renewable contribution for Path 1, or fully include the renewable contribution for Path 2.

PATH 1. PERCENTAGE REDUCTION EXCLUDING ON-SITE RENEWABLE CONTRIBUTION

Path 1, the default energy simulation path, focuses solely on energy efficiency, requiring energy savings at or near achievable technical potential for maximum achievement of points.

This path does not recognize any on-site renewable contribution for the project (striking out ASHRAE 90.1 G2.4, on-site renewable energy guidance). Calculate the PBP with total proposed design energy for all electricity, fuel, and district energy use, regardless of whether this energy is purchased or generated from on-site renewable systems.

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 181