855773644-LEED-v5-BD-C-Reference-Guide-Launch-Edition - Page 336

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improvement thresholds more than three times higher for Path 2 (including on-site renewable contribution) than for Path 1 (excluding on-site renewable contribution).

For credit compliance assessment, apply simple additional calculations to the outputs from the ASHRAE 90.1 Appendix G PRM energy models used to document EAp2: Minimum Energy Efficiency, adjusting the metric, treatment of renewable energy, and/or Building Performance Factor (BPF) .

• Future source energy . The future source energy metric must be used to assess credit compliance even when a different metric is used to document prerequisite compliance.

• Building Energy Factor (BPF) . Performance Index Target (PIt) must be calculated using LEED-published BPFs derived for the future source energy metric.

• Treatment of on-site renewable energy .

o The on-site renewable energy contribution must either be fully excluded for Path 1 or

fully included for Path 2.

o The Performance Index Target (PIt) includes no adjustments for renewable energy,

unlike ASHRAE 90.1-2022 which adjusts for prescriptively required on-site renewable energy.

Further energy savings may also be documented for plug and process and/or district energy efficiency measures that do not contribute towards prerequisite compliance.

Future source energy metric All projects must use the future source energy metric for credit compliance. This metric reflects the average environmental impact of building energy consumption through 2050, considering the primary energy sources and their associated emissions.

Future source energy conversion factor (primary energy factor) The terms source energy and source energy conversion factor referenced below may be used interchangeably with the corresponding terms primary energy and primary energy factor (PEF) commonly used in the European Union (EU).

Source energy is defined as the site energy plus the estimated energy consumed or lost in the extraction, processing, and transportation of primary energy forms such as coal, oil, natural gas, biomass, and nuclear fuel; energy consumed in conversion to electricity or thermal energy; and energy consumed or lost in transmission and distribution to the building site.

Source energy conversion factors must be at least one for all electricity and combustible fuel sources.

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 326