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Extracted Content

Sign-off on 10-year Operational Carbon Projection

From the modeled energy data or the energy estimate, USGBC will provide the project team with a 10-year operational carbon projection. The assumptions behind the estimate include the following:

• No changes are made over the decade that impact energy use.

• The initial electrical carbon coefficient is the latest subregional eGRID coefficient for projects in the U.S., or national coefficient elsewhere, or other more local coefficient that can be credibly documented.

• The electrical carbon coefficient will decline linearly at 3.8% per year (the equivalent of declining by 95% over 25 years).

For tenant spaces, the tenant, or for owner-occupied spaces, the owner, must attest that they have reviewed the 10-year carbon projection.

REQUIREMENTS EXPLAINED

This prerequisite has two requirements which work together to help project teams understand their energy use and the impact on carbon emissions.

Provide Data on Project and Annual Energy Use

Teams must either estimate the project’s annual energy use per energy source or submit project information to inform a rough estimation of project energy usage in Arc.

When estimating energy use, include the proportionate energy use from shared base-building systems serving the project space, such as chilled water (CHW) , hot water, or shared air handling units.

Estimated annual use — energy simulation For projects completing energy modeling for EAp2: Minimum Energy Efficiency, use the summary results from the proposed energy model.

Otherwise, simplified energy modeling may be used to estimate the energy use. The simplified modeling may be from an individual model developed specifically for the project or a prototypical model representative of the project.

Other estimates of project energy consumption may include corporate estimates across the portfolio, or projections generated from the base building Energy Information System (EIS ) .

U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 99