CS-v5 EAc3: Enhanced Energy Efficiency 1-7 points

Credit language

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Intent

To design buildings that minimize energy use to reduce the environmental damage caused by resource extraction, air pollution, and greenhouse gas emissions and to facilitate the transition to a clean energy future.

Requirements

Platinum Requirements:
Five points are required.

Option 1. Prescriptive Path (1–7 points)

Pursue Path 1 and/or Path 2 for a maximum of 7 points.

PATH 1. REGULATED LOADS (1–6 POINTS) 
Points are awarded according to Table 1, using either Case 1 or Case 2.

Case 1. ASHRAE 90.1-2019 (1–5 points) 
Available only to projects registered before January 1, 2028.

• Comply with the provisions of ASHRAE 90.1-2019, Sections 5–10. 
• Implement Additional Efficiency Requirements credits calculated per ASHRAE 90.1-2022, Section 11, from the list of eligible measures referenced below. Where ASHRAE 90.1-2022, Section 11, references the prescriptive requirements of ASHRAE 90.1-2022, Sections 5–10, such as lighting power density or equipment efficiency, replace with the matching prescriptive values in ASHRAE 90.1-2019.
  • Central systems. Earn 1 point for every 13 energy credits where the LEED BD+C: Core and Shell project includes a central HVAC system or service water heating system that includes chillers, boilers, service water heating equipment, or loop pumping systems with heat rejection.
  • All others. Earn 1 point for every nine energy credits for all other LEED BD+C: Core and Shell projects.

OR

Case 2. ASHRAE 90.1-2022 (2–6 points)

• Comply with the provisions of ASHRAE 90.1-2022, Sections 5–11.
• Implement incremental ASHRAE 90.1 2022, Section 11 credits above the minimum required from the list of eligible measures below. 
  • Central systems: 1 point for every 13 incremental energy credits where the LEED BD+C: Core and Shell project includes a central HVAC system or service water heating system that includes chillers, boilers, service water heating equipment, or loop pumping systems with heat rejection.
  • All others: 1 point for every nine incremental energy credits for all other LEED BD+C: Core and Shell projects.

Eligible measures from ASHRAE 90.1-2022, Section 11.5.2, for LEED points

• HVAC measures (H01 to H07)
• Service water heating measures (W01 to W09)
• Lighting measures (L01 to L06)
• G07 building mass/night flush

Table 1. Points for ASHRAE 90.1-2022, Section 11 Credits

AND/OR

PATH 2. PLUG AND PROCESS LOADS (1–3 POINTS)
Case 1. Plug Load Management (1 point)

Implement the following:

• Provide to all regular occupants of the building a plug load dashboard accessed through an application that displays base building plug loads and allows tenants to choose whether to display plug loads to their occupants.
• Configure the plug load monitoring system with the capability to expand to monitor future plug loads for each floor and for individual tenant spaces.

AND/OR

Case 2. Efficient Plug and Process Load Equipment (1–3 points)
Install or reuse equipment meeting the criteria in Table 2. Points are awarded according to Table 2 up to a maximum of 3 points for each equipment category where the criteria are met.

Table 2. Plug, Process, Refrigeration, and Conveyance Equipment Criteria

Data centers
Data centers that comprise at least 40% of the project’s total area with the electrical system in the project scope earn 2 points for complying with the data center electrical system requirements.

Warehouses
Refrigerated warehouses that comprise at least 20% of the project’s gross floor area with the refrigeration systems in the project scope earn 2 points for complying with the refrigeration system requirements.

OR

Option 2. Energy Simulation (1–7 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.
  • Case 1. ASHRAE 90.1-2019. Replace ASHRAE 90.1-2019, Table 4.2.1.1, Building Performance Factors, with Table 4. For major building renovation areas, multiply the BPF by 1.05.
  • Case 2. ASHRAE 90.1-2022. Replace ASHRAE 90.1-2022, Table 4.2.1.1, Building Performance Factors, with Table 5. For major building renovation areas, multiply the BPF by 1.05.
• Replace all references to cost with future source energy. Use an electric site-to-source 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. Calculate the 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
  • PI_t = [BBUE + (BPF x BBRE)] / BBP
    where:
    • PI_nre = performance index for future source energy excluding on-site renewable contribution 
    • PI = performance index for future source energy including on-site renewable contribution
    • PI_t = performance index target for future source energy use
    • BBP = baseline building performance for baseline building future source energy use
    • BBUE = baseline building unregulated future source energy use
    • BBRE = baseline building regulated future source energy use
    • PBP_nre = proposed building performance without any credit for reduced annual future source energy from on-site renewable energy generation systems
    • PBP = proposed building performance, including the reduced annual future source energy associated with all on-site renewable energy generation systems  

Points are awarded according to Table 3, using either Path 1 or Path 2.

Table 3. Points for percentage improvement in PI Below PIT

Table 4. ASHRAE 90.1-2019: Equivalent Building Performance Factors for a Future Source Energy Metric

Table 5. ASHRAE 90.1-2022 — Equivalent Building Performance Factors for a Future Source Energy Metric