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  • Published national or EU-average source energy conversion factor conforming to the definition of source energy provided above.

District Energy Systems (DES) For projects that directly model purchased heat and/or purchased chilled water as independent sources, refer to EAp2: Minimum Energy Efficiency, District Energy Systems (DES), Method B.

Source energy factors published by the DES provider or calculated for a campus DES system must conform to the definition of source energy provided above.

Future source energy metric The future source energy metric prioritizes energy efficiency, limiting trade-offs with decarbonization measures recognized in other LEED credits. Other metrics used for code compliance or EAp2: Minimum Energy Efficiency are not applicable for EAc3: Enhanced Energy Efficiency :

  • 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 greenhouse gas emissions metric overemphasizes the decarbonization already credited under EAc1: Electrification and EAc4: Renewable Energy .

Building performance factor Performance Index Target (PIt) must be calculated using LEED-published Building Performance Factors (BPFs) derived for the future source energy metric.

For major renovations or projects with existing building area in the project boundary, multiply the LEED-published BPFs by 1.05 for the proportion of existing building area associated with each building area type.

NEW CONSTRUCTION Reference New Construction Table 5. 90.1-2019, Equivalent Building Performance Factors for a Future Source Energy Metric. 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 .

U.S. Green Building Council LEED v5 Reference Guide for Building Design and Construction, April 2025 Launch Edition 328

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