Log in
LEED v4
Hospitality – Commercial Interiors
Energy and Atmosphere

Minimum energy performance

LEED CREDIT

Hospitality-CI-v4 EAp2: Minimum Energy Performance Required

LEEDuser’s viewpoint

Frank advice from LEED experts

LEED is changing all the time, and every project is unique. Even seasoned professionals can miss a critical detail and lose a credit or even a prerequisite at the last minute. Our expert advice guides our LEEDuser Premium members and saves you valuable time.

Credit language

USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Requirements

Option 1. Tenant-level energy simulation
Demonstrate a 3% improvement in the proposed performance rating compared with the baseline performance rating for portions of the building within the tenant’s scope of work. Calculate the baseline according to ANSI/ASHRAE/IESNA Standard 90.1–2010, Appendix G, with errata (or a USGBC-approved equivalent standard for projects outside the U.S.), using a simulation model for all tenant project energy use. Projects must meet the minimum percentage savings before application of renewable energy systems. The proposed design must meet the following criteria: Exception: the baseline project envelope must be modeled according to Table G3.1(5) (baseline), Sections a–e, and not Section f. Document the energy modeling input assumptions for unregulated loads. Unregulated loads should be modeled accurately to reflect the actual expected energy consumption of the tenant project. If unregulated loads are not identical for both the baseline and the proposed performance ratings, and the simulation program cannot accurately model the savings, follow the exceptional calculation method (ANSI/ASHRAE/IESNA Standard 90.1–2010, G2.5). Alternatively, use the COMNET modeling guidelines and procedures to document measures that reduce unregulated loads.

OR

Option 2. Prescriptive compliance
Comply with the mandatory and prescriptive provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010, with errata (or a USGBC-approved equivalent standard for projects outside the U.S.).
  • Reduce connected lighting power density by 5% below ASHRAE 90.1-2010 using the space-by-space method or by applying the whole-building lighting power allowance to the entire tenant space.
  • Install ENERGY STAR appliances, office equipment, electronics, and commercial food service equipment (HVAC, lighting, and building envelope products are excluded) for 50% (by rated-power) of the total ENERGY STAR eligible products in the project. Projects outside the U.S. may use a performance equivalent to ENERGY STAR.

Alternative Compliance Paths (ACPs)

Canada ACP - NECB

Projects in Canada may instead demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the National Energy Code for Buildings (NECB) 2011. The same percentage cost improvement in energy performance is required to meet the Prerequisite, and the same points for cost percentage improvement in energy performance are applicable for the Credit.

The following conditions (where applicable) must be met. Note that unless otherwise noted, CanQUEST (the Canadian energy modelling software based on eQUEST that performs NECB 2011 compliance runs) does not implement many of these conditions correctly and would require corresponding modifications to the Reference case.

  1. Comply with mandatory requirements of ASHRAE 90.1-2010
  2. ASHRAE 90.1-2010 mandatory requirements must be met, in addition to the performance path limitations referenced in the NECB 2011 Sections 3.4.1.2, 5.4.1.2 and 6.4.1.2. In cases where ASHRAE and the NECBC reference requirements concerning the same item, the more stringent requirement shall be adhered to.

    The following exceptions apply:

  • ASHRAE 90.1-2010 mandatory items 6.4.3.9, 9.4.1.2b, 9.4.1.4, 9.4.1.5, 9.4.3
  • Apply fenestration area convention similar to ASHRAE 90.1-2010
  • Maintain the same FWR (as defined by NECB, including doors) for the Reference as exists in the Proposed Design, up to the prescribed maximum. If the Proposed Design’s FWR exceeds the prescribed FWR, scale down the fenestrations in the Reference case accordingly.

  • Apply skylight area convention similar to ASHRAE 90.1-2010
  • Maintain the same SRR for the Reference as exists in the Proposed Design, up to the prescribed 5% maximum. If the Proposed Design’s SRR exceeds 5%, scale down the skylights in the Reference case accordingly.

  • Model proposed and reference outside air similar to ASHRAE 90.1-2010
  • Proposed and reference (baseline) outside air rates shall be modeled as per ASHRAE 90.1 – 2010 (G3.1.2.6).

  • Apply ASHRAE kitchen exhaust demand ventilation requirements
  • Provide for the same demand ventilation requirements as described in ASHRAE Appendix G3.1.1.d.

  • Apply ASHRAE’s chiller heat recovery requirements
  • Provide for the same chiller heat recovery requirements as applies to ASHRAE.

  • Apply supply air temperature reset controlled based on warmest zone
  • Reset the minimum supply air temperature to satisfy the cooling requirements of the warmest zone, as stipulated in NECB Section 5.2.8.8. Note that this control setting is already corrected in CanQUEST for the Reference case.

  • Account for uninsulated structural penetrations if they exceed 2% of net wall area
  • The 2% allowance may be applied, but based on the net opaque wall area, not the entire building envelope area.

  • Follow ASHRAE/LEED rules for renovations to existing buildings
  • Model existing components consistent with ASHRAE and LEED provisions.

  • Account for all anticipated energy use in building
  • Fully account for all energy end-uses in the energy performance modelling.

  • DES Systems are to be modeled according to Option 1, Path 1 or Option 1, Path 2 as indicated in the LEED v4 Reference Guide
  • The following exceptions apply:

    • Option 1, Path 1 - Do not apply ASHRAE 90.1-2010 requirements for purchased heating and cooling. Under this ACP, purchased heating and cooling (as applicable) are modeled as cost-neutral in the baseline and proposed case. Local rates for purchased heating (fossil fuel based) and cooling are used to establish the purchased heating and cooling costs. The energy model's scope accounts for only downstream equipment, plus purchased heating and cooling. NECB clause 8.4.3.6 does not apply for LEED projects.
    • Model baseline systems in accordance with NECB requirements, with DX coils replaced with chilled water coils if purchased cooling is present and fossil-fired furnaces replaced with hot water coils if purchased heating is present.
    • Option 1, Path 2: Do not apply ASHRAE 90.1-2010 requirements for baseline systems. Model baseline systems in accordance with NECB requirements for onsite generated equipment (i.e. assume building is not connected to a DES and the proposed building is modeled with a virtual plant according to LEED v4 Reference Guide requirements).
    See all forum discussions about this credit »

    What does it cost?

    Cost estimates for this credit

    On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.

    Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.

    This information is also available in a full PDF download in The Cost of LEED v4 report.

    Learn more about The Cost of LEED v4 »

    Frequently asked questions

    Our proposed design has insulation R-values that are below those prescribed by ASHRAE 90.1-2010. Can we still meet the prerequisite?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Do the required savings for this prerequisite (and credit) need to come only from building energy, or also process loads?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Our project doesn't have enough energy savings to earn the prerequisite. Can we get there by incorporating onsite renewables?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Does the base building information need to be included in the minimum energy performance calculator, or is it sufficient to just include the tenant space?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Are there any exceptions to the daylight control requirement of ASHRAE 90.1–2010?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    See all forum discussions about this credit »

    Addenda

    4/21/2023Updated: 4/21/2023
    Reference Guide Correction
    Description of change:
    Revise the legend for the third calculation in the CHP Modeling Guidance to the following:

    Under "where…":

    Replace "Proposed CHP_ELECbldg" with "BLDGfuel"
    Replace "CHP_ELECtotal" with "CHP_ ELECbldg"

    Campus Applicable
    No
    Internationally Applicable:
    No
    4/9/2021Updated: 6/10/2021
    Form Update
    Description of change:
    Summary tab: revise rounding on the Summary output tab to round down (i.e. the same as the rounding on the Performance outputs tab).
    Campus Applicable
    No
    Internationally Applicable:
    No
    4/6/2018Updated: 11/6/2020
    Reference Guide Correction
    Description of change:
    Add the following to the bottom of the International Tips section:

    "Developed by members of the European Roundtable, this table provides further guidance for project teams in Europe wishing to use European standards in lieu of certain ASHRAE 90.1-2010 mandatory provisions in LEED v4. The guidance covers ASHRAE 90.1-2010 Mandatory Provision Sections 5.4, 6.4, 7.4, 8.4, 9.4 and 10. Column 1 of the table references the specific subsection used in ASHRAE 90.1-2010. Column 2 displays the requirement as written in ASHRAE 90.1-2010. Column 3 outlines the compliance pathway available for European projects. Column 4 includes, in some cases, further information about the proposal, differences between the proposal and the ASHRAE requirement, or a reference to further documentation.

    Please refer back to the LEED v4 web-based reference guide (Further Explanation > International Tips > Europe) for further information on the regional alternative compliance path.

    Additionally, for projects using the Performance Option for compliance with EAp2: Minimum Energy Performance and EAc1: Optimize Energy Performance, the documentation must also use the calculated U-factor for fenestration products including windows and skylights based on either the LBNL Windows 6 program, or a simulation software program that approximates the NFRC rating methodologies. Alternatively, a narrative shall be provided supporting the claim that the fenestration U-factor used in the model is similar to the values that would be achieved using the NFRC rating. The CE-marked fenestration does not account for thermal bridging and seasonal performance in the same way as the NFRC rating, and when accounted for in the energy model, has been observed to lead to savings that exceed those claimed for the same fenestration rated under the NFRC ratings."
    Campus Applicable
    No
    Internationally Applicable:
    No
    4/6/2018Updated: 11/6/2020
    Regional ACP
    Description of change:
    Add the following to the bottom of the International Tips section:

    "Developed by members of the European Roundtable, this table provides further guidance for project teams in Europe wishing to use European standards in lieu of certain ASHRAE 90.1-2010 mandatory provisions in LEED v4. The guidance covers ASHRAE 90.1-2010 Mandatory Provision Sections 5.4, 6.4, 7.4, 8.4, 9.4 and 10. Column 1 of the table references the specific subsection used in ASHRAE 90.1-2010. Column 2 displays the requirement as written in ASHRAE 90.1-2010. Column 3 outlines the compliance pathway available for European projects. Column 4 includes, in some cases, further information about the proposal, differences between the proposal and the ASHRAE requirement, or a reference to further documentation.

    Please refer back to the LEED v4 web-based reference guide (Further Explanation > International Tips > Europe) for further information on the regional alternative compliance path.

    Additionally, for projects using the Performance Option for compliance with EAp2: Minimum Energy Performance and EAc1: Optimize Energy Performance, the documentation must also use the calculated U-factor for fenestration products including windows and skylights based on either the LBNL Windows 6 program, or a simulation software program that approximates the NFRC rating methodologies. Alternatively, a narrative shall be provided supporting the claim that the fenestration U-factor used in the model is similar to the values that would be achieved using the NFRC rating. The CE-marked fenestration does not account for thermal bridging and seasonal performance in the same way as the NFRC rating, and when accounted for in the energy model, has been observed to lead to savings that exceed those claimed for the same fenestration rated under the NFRC ratings."
    Campus Applicable
    No
    Internationally Applicable:
    No
    7/10/2020Updated: 7/10/2020
    Form Update
    Description of change:
    add "Dining Area" space type to the dropdown list under "Table 9.6.1 Space Type" in the lighting tab.
    Campus Applicable
    No
    Internationally Applicable:
    No
    7/1/2014Updated: 3/29/2018
    Regional ACP
    Description of change:
    Add the following as a USGBC-approved equivalent standard for projects outside the U.S.

    "Projects in Canada may instead demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the National Energy Code for Buildings (NECB) 2011. The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit.

    The following conditions (where applicable) must be met. Note that unless otherwise noted, CanQUEST (the Canadian energy modelling software based on eQUEST that performs NECB 2011 compliance runs) does not implement these conditions correctly and would require corresponding modifications to the Reference case.

    1. Comply with mandatory requirements of ASHRAE 90.1-2010
    ASHRAE 90.1-2010 mandatory requirements must be met, in addition to the performance path limitations referenced in the NECB 2011 Sections 3.4.1.2, 5.4.1.2 and 6.4.1.2. In cases where ASHRAE and the NECBC reference requirements concerning the same item, the more stringent requirement shall be adhered to.

    2. Apply fenestration area convention similar to ASHRAE 90.1-2010
    Maintain the same FWR (as defined by NECB, including doors) for the Reference as exists in the Proposed Design, up to the prescribed maximum. If the Proposed Design’s FWR exceeds the prescribed FWR, scale down the fenestrations in the Reference case accordingly.

    3. Apply skylight area convention similar to ASHRAE 90.1-2010
    Maintain the same SRR for the Reference as exists in the Proposed Design, up to the prescribed 5% maximum. If the Proposed Design’s SRR exceeds 5%, scale down the skylights in the Reference case accordingly.

    4. Model proposed and reference outside air similar to ASHRAE 90.1-2010
    Proposed and reference (baseline) outside air rates shall be modelled as per ASHRAE 90.1 – 2010 (G3.1.2.6).

    5. Apply ASHRAE kitchen exhaust demand ventilation requirements
    Provide for the same demand ventilation requirements as described in ASHRAE Appendix G3.1.1.d.

    6. Apply ASHRAE’s chiller heat recovery requirements
    Provide for the same chiller heat recovery requirements as applies to ASHRAE.

    7. Apply supply air temperature reset controlled based on warmest zone
    Reset the minimum supply air temperature to satisfy the cooling requirements of the warmest zone, as stipulated in NECB Section 5.2.8.8. Note that this control setting is already corrected in CanQUEST for the Reference case.

    8. Account for uninsulated structural penetrations if they exceed 2% of net wall area
    The 2% allowance may be applied, but based on the net opaque wall area, not the entire building envelope area.

    9. Follow ASHRAE/LEED rules for renovations to existing buildings
    Model existing components consistent with ASHRAE and LEED provisions.

    10. Account for all anticipated energy use in building
    Fully account for all energy end-uses in the energy performance modeling."
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/25/2017Updated: 8/1/2017
    Form Update
    Description of change:
    v2009/v4 Minimum Energy Performance Calculator:
    • Fixed formatting issues in the Performance Outputs tab
    • Corrected calculation within the Service Water Heating tab.
    Campus Applicable
    Yes
    Internationally Applicable:
    Yes
    4/14/2017Updated: 4/24/2017
    Reference Guide Correction
    Description of change:
    In the Project Type Variations section, under Path 1. ASHRAE 90.1-2010, Appendix G, at the bottom of the section with the title "Energy Rates" in italics, insert the following guidance for projects where no tariffs or rates are available from the district energy system servicing the project:

    "Energy Rates for Path 1:
    • If tariffs or rates are not available from the district plant servicing the project (e.g. for campus or military plants), calculate the rates based on the virtual electric and fossil fuel rates from the model:
    o If a flat rate structure is being used for all energy sources (meaning the cost per unit energy is the same throughout the year, and there are no demand charges), then these flat rates simply become the virtual energy rates for the project.
    o Otherwise, if all energy rate structures are not flat, then a preliminary run of the Option 1 Baseline Case energy model must first be completed to identify the virtual electric and fossil fuel rates for the project. For this preliminary run only, the rate for the DES-supplied energy may be left blank, or may be entered as any value.
    o Once all the virtual energy rates are known for electricity and fossil fuel, the virtual DES rates for both the Baseline and Proposed Case are then derived as follows:
    District Chilled Water Rate:
    Units of $/(Btu x 106) = Virtual Electric Rate (in $/kWh) x 71
    Units of $/ton-hour = Virtual Electric Rate (in $/kWh) x 0.85
    Units of $/kWh = Virtual Electric Rate (in $/kWh) x 0.24
    District Hot Water Rate:
    Units of $/(Btu x 106) = Virtual Fuel Rate (in $/(Btu x 106)) x 1.59 + Virtual Electric Rate (in $/kWh) x 3
    Units of $/kWh = Virtual Fuel Rate (in $/kWh) x 1.59 + Virtual Electric Rate (in $/kWh) x 0.01
    Units of $/therm = Virtual Fuel Rate (in $/therm) x 1.59 + Virtual Electric Rate (in $/kWh x 0.3)

    District Steam Rate:
    Units of $/ (Btu x 106) = Virtual Fuel Rate (in $/(Btu x 106)) x 1.81 + Virtual Electric Rate (in $/kWh) x 3
    Units of $/kWh = Virtual Fuel Rate (in $/kWh) x 1.81 + Virtual Electric Rate (in $/kWh) x 0.01
    Units of $/therm = Virtual Fuel Rate (in $/therm) x 1.81 + Virtual Electric Rate (in $/kWh x 0.3)

    o Exception: to obtain the virtual fuel rate when the connected building does not use fossil fuel but the DES central plant does, use a flat rate consistent with the central plant rates or the historic average local market rates (no preliminary model run is needed). The virtual fuel rates must match in the Baseline and Proposed Case.
    o The virtual DES rates are then input into the modeling software for each DES source and used for the remainder of the process. Alternatively, the virtual DES rates may be used to calculate the DES energy costs directly by multiplying the DES energy consumption for each DES source by its virtual DES rate. All virtual DES energy rates must be identical in the Baseline and Proposed Case."

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    4/14/2017Updated: 4/19/2017
    Form Update
    Description of change:
    • Functionality has been added to allow for eQUEST and TRACE files to be automatically imported into the calculator.
    • Bug fixes for the Opaque Assemblies, Shading and Fenestration, and Schedules tabs.
    • Bug fixes for the Service Hot Water Flow calculations.
    • Bug Fixes for Schedules tab
    • v2009 Only – Bug fix to allow macros to make automatic changes for LEED v3 BD+C: Multifamily Midrise
    • v2009 Only – ASHRAE 90.1-2010 requirement has been removed from the General HVAC tab confirmation boxes.
    Campus Applicable
    Yes
    Internationally Applicable:
    Yes
    4/14/2017Updated: 4/14/2017
    Reference Guide Correction
    Description of change:
    Delete the third bullet point:

    "The baseline case must follow Appendix G requirements for all components and systems, including the building envelope. Existing conditions are not permitted to be modeled for the baseline case."
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    9/13/2016Updated: 11/15/2016
    Form Update
    Description of change:
    (calculator dated 8/23/2016, published 9/13/2016)
    • Baseline System Helpful Notes Section has been updated in the Water-Side HVAC tab
    • District energy system (DES) Path 3 calculations have been revised
    • Optional notes column has been added to each tab for project teams to provide further clarification
    • Exceptional calculation formulas have been revised
    • Performance upgrade to the General Information tab has been implemented
    • Baseline case fan power formulas have been updated
    • Lighting table language has been updated (v2009)
    • Exterior lighting quality assurance (QA) checks have been updated
    • Further guidance has been provided for determining unitary cooling efficiency in the Helpful Notes section of the Air-Side HVAC tab
    • Performance Outputs tab formulas have been revised to be more robust for multiple building projects
    • Summary tab formulas have been revised to reference total cost savings with and without renewable energy contribution
    • Receptacle Equipment Modeling Method tables have been revised to be more robust for multiple building projects
    Campus Applicable
    No
    Internationally Applicable:
    No
    7/1/2015Updated: 7/1/2015
    Reference Guide Correction
    Description of change:
    After the first paragraph, add the following:/n

    "For an expanded reference of international locations, ASHRAE 169-2013 Table A-5 (Canada) or Table A-6 (International) may be consulted. ASHRAE 169-2013 subdivides Climate Zone 1 into two climate zones (Climate Zone 1 and Climate Zone 0). Locations listed in ASHRAE 169-2013 in Climate Zone 1 and Climate Zone 0 should be considered Climate Zone 1 under ASHRAE 90.1-2010."
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    10/1/2014Updated: 2/14/2015
    Reference Guide Correction
    Description of change:
    Revise footnote #1 to:

    ANSI/ASHRAE/IES 90.1–2010 Final Determination Quantitative Analysis, p. 29, https://www.energycodes.gov/sites/default/files/documents/BECP_FinalQuan... (accessed July 11, 2014).
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/1/2015
    LEED Interpretation
    Inquiry:

    For projects located in California, can the 2013 Title 24 Part 6 California Energy Code be used to demonstrate compliance in lieu of ASHRAE 90.1-2010?

    Ruling:

    Instead of ASHRAE 90.1-2010 Appendix G, projects in California may demonstrate compliance with the 2013 Title 24 Part 6 California Energy Code using the Performance method. The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit.
    The following conditions (where applicable) must be met:
    • Energy Cost shall be used as the performance metric rather than TDV energy. Exception: A Pilot ACP allowing alternate metrics may be applied as applicable.
    • Model all process energy consumption within and associated with the building as designed. Model all enclosed building spaces within and associated with the building even if the space types are not regulated by Title-24.
    • BD+C: Major renovations must be modeled using the Title-24 new construction modeling requirements for HVAC, DHW, and lighting (as opposed to existing conditions). However, for LEED-BD&C, the baseline envelope conditions may be modeled using existing conditions prior to renovation.
    • ID+C: The energy model must be modeled using the Title-24 new construction requirements for HVAC, DHW, lighting and envelope.

    Campus Applicable
    Yes
    Internationally Applicable:
    No
    10/1/2014
    LEED Interpretation
    Inquiry:

    The ENERGY STAR program is continuously releasing new and updated standards for products. Project teams may be unaware that a product they are purchasing is subject to an ENERGY STAR standard. Can a project team exclude equipment covered by recently developed ENERGY STAR product specifications from the prerequisite and credit calculations? If all equipment must be included, are teams required to use the rated power or can teams “discount” the rated power to reflect average consumption or actual operating power demand? And how should international projects apply this to new ENERGY STAR product specifications or other equipment or appliances where an ENERGY STAR option is not available locally?

    Ruling:

    As required in LEED Interpretation 10044, all equipment classified as eligible by ENERGY STAR must be included in the calculations. Equipment that is procured within two years of the effective date of the first (i.e. Version 1.0) ENERGY STAR product specification for that equipment category may be included or excluded at the discretion of the project team; however, all equipment within that category must be included or excluded consistently. Refer to the ENERGY STAR product specification(s) for the effective date.

    Calculations may be completed using either the rated power OR the average annual power consumption, but the metric selected must be consistent for all equipment included in the calculations. For the purposes of demonstrating equivalency to the ENERGY STAR product specification by average annual power consumption, equipment purchased may use no more than the average annual energy consumption of the equivalent ENERGY STAR-qualified product as determined by the appropriate ENERGY STAR savings calculator. The average annual power consumption for purchased equipment may be demonstrated by manufacturer documentation or calculated from actual equipment operating data and anticipated use profiles.

    For Uninterruptible Power Supply (UPS) equipment:

    If using the rated power methodology, the UPS “rated power” for the LEED Calculation may optionally be derated to 35% of the UPS Rated Output Power to more accurately reflect the relative energy usage associated with UPS equipment compared to other Energy Star equipment.

    If using the average annual power consumption methodology, the UPS average annual power consumption (in units of kWh/year) shall be calculated as:
    UPS Annual Power Consumption = 6,600 x Power x (1-EffAVGMIN)

    Where:

    Power is the UPS Rated Output Power in units of kW.

    EffAVGMIN is determined consistently with the ENERGY STAR® Program Requirements, or 93.7% if unknown.

    For projects located outside of the United States, the following approved standards may be used in place of ENERGY STAR for equipment categories covered by these standards: EU ENERGY STAR, TCO, Blue Angel. Additionally, equipment classified as eligible by ENERGY STAR but not ENERGY STAR-qualified may be deemed equivalent if the equipment has been labeled by a local energy label and has been rated by the labeling program to use no more than the average annual energy consumption of the equivalent ENERGY STAR-qualified product as determined by the appropriate ENERGY STAR savings calculator.

    Updated 01/05/18 for rating system version applicability and to provide additional calculation options for Uninterruptible Power Supply equipment.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/2/2018
    LEED Interpretation
    Inquiry:

    Our project is located in California. To pursue Option 1: Whole Building Simulation, is there a methodology for documenting additional energy performance for LEED v4 projects regulated by Title 24-2016?

    Ruling:

    Project Type1
    Additional Percent Savings

    NC-Office
    7%

    NC-Retail (except restaurant/grocery)
    8%

    NC-School
    7%

    NC-Health Care
    0%

    NC-Restaurant/Grocery
    0%

    NC-Hospitality
    8%

    NC-Warehouse
    0%

    NC-Multifamily
    8%

    NC-All Other
    0%

    CS-Office
    5%

    CS-Retail (except restaurant/grocery)
    7%

    CS-School
    5%

    CS-Health Care
    0%

    CS-Restaurant/Grocery
    0%

    CS-Hospitality
    7%

    CS-Warehouse
    0%

    CS-Multifamily
    7%

    CS-All Other
    0%

    CI-Office
    6%

    CI-Retail (except restaurant/grocery)
    7%

    CI-School
    6%

    CI-Health Care
    0%

    CI-Restaurant/Grocery
    0%

    CI-Hospitality
    7%

    CI-Warehouse
    0%

    CI-Multifamily
    7%

    CI-All Other
    0%

    Campus Applicable
    No
    Internationally Applicable:
    No
    1/4/2016
    LEED Interpretation
    Inquiry:

    Where the local code does not require vestibules or allows alternatives, can the project team take a penalty for not including vestibules in the design model?

    Ruling:

    Yes, in locations where the local code does not require vestibules or revolving doors the project team may choose one of the two options below. Additionally, all projects using this method must provide a narrative explaining how infiltration and exfiltration of air through building entries is addressed in the design.

    1. Manual subtraction of the energy cost savings associated with vestibules as conservatively estimated by PNNL-20026 “Energy Saving Impact of ASHRAE 90.1 Vestibule Requirements: Modeling of Air Infiltration through Door Openings”. Refer to the Related Resource “Default Deduction for Vestibules” for the specific percentage subtraction required based on project type and climate zone.
    2. Provide detailed exceptional calculation method calculations with each step of the calculation clearly described and in alignment with the analysis performed in PNNL-20026, but specific to the project building. Document the additional energy consumption of the project building associated with removing the vestibules from the project. No credit will be given for the use of air curtains when using this approach. A sensitivity analysis related to the number of occupants entering on an hourly basis would need to be justified. The narrative would also need to justify that the simulation software is capable of addressing the conditions required for the calculation. (Software with a well-mixed air assumption would not be able to apply this modeling approach).

    ***Update 11/9/20: This ruling is now applicable to LEED v4.1 BD+C and ID+C projects.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/1/2015
    LEED Interpretation
    Inquiry:

    For projects located in Seattle, can the 2012 Seattle Energy Code be used to demonstrate compliance in lieu of ASHRAE 90.1-2010?

    Ruling:

    Instead of ASHRAE 90.1-2010 Appendix G, projects in Seattle may demonstrate compliance with with all mandatory provisions of the 2012 Seattle Energy Code AND demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the 2012 Seattle Energy Code Total Building Performance (Section C407). The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit.
    The following conditions (where applicable) must be met:
    • Energy Cost shall be used as the performance metric rather than site energy (versus Section C407.3 which indicates that site energy shall be used). Exception: A Pilot ACP allowing alternate metrics may be applied as applicable.
    • Model proposed and reference outside air similar to ASHRAE 90.1-2010.
    o Proposed and reference (baseline) outside air rates shall be modeled as per ASHRAE 90.1 – 2010 (G3.1.2.6).
    • In addition to the documentation requirements established by the Seattle Energy Code, all required LEED documentation must be provided (and must include the same information as is required for ASHRAE 90.1-2010, with all baseline and proposed inputs shown) including:
    o The LEED EAp2: Minimum Energy Performance form
    o The LEED EAc1: Optimize Energy Performance form
    o The LEED v4 Minimum Energy Performance Calculator (http://www.usgbc.org/resources/minimum-energy-performance-calculator) (or a document with equivalent information) with Baseline inputs updated to refer to Seattle Energy Code.
    • Multifamily high-rise and dormitory projects are not eligible for this alternative compliance path.
    • BD+C: The equivalence applies for new construction only and does not apply to major renovations.
    • ID+C: The energy model must be modeled using the Title-24 new construction requirements for HVAC, DHW, lighting and envelope.

    Campus Applicable
    Yes
    Internationally Applicable:
    No
    10/17/2016
    LEED Interpretation
    Inquiry:

    Can commercial interiors projects use the existing envelope in the baseline energy model in Option 1 of LEED v4 ID+C Energy and Atmosphere (EA) prerequisite Minimum Energy Performance and EA credit Optimize Energy Performance?

    Ruling:

    Yes. As an alternative to modeling the ASHRAE 90.1 Appendix G prescriptive new construction envelope requirements in the Baseline, project teams may use the existing envelope in the baseline energy model per ASHRAE 90.1-2010 Table G.3.1.5 (baseline) f, subject to revised percentage improvement thresholds for (EA) prerequisite Minimum Energy Performance and EA credit Optimize Energy Performance outlined below.

    Project teams modeling the existing envelope in the baseline must demonstrate 5% performance improvement under EA prerequisite Minimum Energy Performance, and must demonstrate a 2% performance improvement above established performance thresholds in EA credit Optimize Energy Performance to earn the corresponding number of points. For example, project teams must demonstrate 6% performance improvement to achieve 4 points, 7% performance improvement to achieve 6 points, 8% performance improvement to achieve 8 points, etc. Project teams must demonstrate 30% performance improvement to achieve 25 points under EA credit Optimize Energy Performance.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/2/2018
    LEED Interpretation
    Inquiry:

    Our project is subject to ASHRAE Standard 90.1-2013 for code compliance. To pursue Option 1: Whole Building Simulation, is there a methodology for documenting additional energy performance for LEED v4 projects regulated by ASHRAE Standard 90.1-2013?

    Ruling:

    Yes, projects applying Option 1: Whole Building Simulation, and regulated by ASHRAE Standard 90.1-2013 may document additional energy performance improvement under LEED v4 EA credit Optimize Energy Performance as described below. The Appendix G modeling method must be used for the LEED submission, even if the Energy Cost Budget method is used to document local code compliance.

    Projects may calculate the Equivalent ASHRAE 90.1-2010 Performance improvement as:
    Equivalent performance Improvement = % better than ASHRAE 90.1-2013 + Additional Percent Savings

    Where Additional Percent Savings is shown in Table 1:

    Table 1: Additional Percent Savings for ASHRAE 90.1-2013

    Project Type1 Additional Percent Savings
    NC-Office 5%
    NC-Retail (except restaurant/grocery) 5%
    NC-School 6%
    NC-Health Care 3%
    NC-Restaurant / Grocery 3%
    NC-Hospitality 5%
    NC-Warehouse 1%
    NC-Multifamily 3%
    NC-All Other 2%
    CS-Office 3%
    CS-Retail (except restaurant/grocery) 3%
    CS-School 6%
    CS-Health Care 1%
    CS-Restaurant / Grocery 2%
    CS-Hospitality 3%
    CS-Warehouse 0%
    CS-Multifamily 1%
    CS-All Other 1%
    CI-Office 3%
    CI-Retail (except restaurant/grocery) 4%
    CI-School 6%
    CI-Health Care 2%
    CI-Restaurant / Grocery 3%
    CI-Hospitality 4%
    CI-Warehouse 0%
    CI-Multifamily 1%
    CI-All Other 2%

    1 Mixed use buildings shall use the weighted average Additional Percent Savings based on the gross enclosed floor area associated with each building type. Unfinished spaces not submitted in the CS rating system shall use the CS values. Data center space must always be considered “All Other”.

    Campus Applicable
    No
    Internationally Applicable:
    No
    7/8/2017
    LEED Interpretation
    Inquiry:

    ASHRAE 90.1-2010 mandatory requirement 8.4.2 Automatic Receptacle Control applies to 125 Volt receptacles in private offices, open offices, and computer classrooms. Are there any cases where exceptions to these mandatory requirements will be allowed?

    Ruling:

    The project team is requesting clarification regarding how to model spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. Projects using one of the following two compliance paths are exempt from the receptacle control requirements:

    1. Path 1: Projects Using Option 1. Whole Building Energy Simulation may model a penalty in the Proposed model for the spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. The following modeling requirements apply:
    • The receptacle power density modeled for these spaces shall be the greater of 0.75 Watts per square foot (8.1 Watts per square meter) or the design coincident peak receptacle power density (if known).
    • The receptacle schedule modeled in the Baseline for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than:
    o The ASHRAE 90.1-2010 User’s Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year)
    OR
    o 120% of the occupied hours of operation for the facility
    OR
    o Detailed justification shall be provided supporting an alternate schedule.

    • The Proposed model shall include either a 20% increase in the receptacle power density for these spaces OR a 20% increase in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Baseline model.

    2. Path 2: Projects must demonstrate that the project has implemented efficiency measures that will achieve an equal or greater reduction in receptacle energy consumption, and will persist for a similar timeframe to those achieved by ASHRAE 90.1-2010 Section 8.4.2. It is recommended that a Credit Interpretation Request be submitted when pursuing this approach. The project must provide documentation regarding the receptacle equipment controls that will be implemented for the project; and must provide justification supporting the claim that the savings over the life of the efficiency measure will be similar to those anticipated for a project compliant with Section 90.1-2010 Section 8.4.2. Note: The baseline and proposed receptacle energy consumption for these spaces must be modeled identically if using this approach; the project is not eligible for any further receptacle savings in these spaces using the Exceptional Calculation Method.

    Update 11/9/20:
    Where ASHRAE 90.1 receptacle controls are not implemented in accordance with Section 8.4.2 mandatory requirements, LEED v4.1 projects may apply either Path 1 or Path 2, subject to the following requirements for Path 1:
    • Path 1: LEED v4.1 projects Using the Appendix G Performance Rating Method may model a penalty in the energy model. The following modeling requirements apply:
    o The Proposed receptacle power density modeled for these spaces shall be the greater of 0.75 Watts per square foot (8.1 Watts per square meter) or the design coincident peak receptacle power density (if known)
    o The receptacle schedule modeled in the Proposed design for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than: the ASHRAE 90.1-2016 User’s Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year); or 120% of the occupied hours of operation for the facility; or detailed justification shall be provided supporting an alternate schedule.
    o The Baseline model shall include either a 20% decrease in the receptacle power density for these spaces OR a 20% decrease in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Proposed model.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    See all forum discussions about this credit »

    Documentation toolkit

    The motherlode of cheat sheets

    LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.

    LEEDuser expert

    Marcus Sheffer

    7group / Energy Opportunities
    LEED Fellow

    Get the inside scoop

    Our editors have written a detailed analysis of nearly every LEED credit, and LEEDuser premium members get full access. We’ll tell you whether the credit is easy to accomplish or better left alone, and we provide insider tips on how to document it successfully.

    USGBC logo

    © Copyright U.S. Green Building Council, Inc. All rights reserved.

    Requirements

    Option 1. Tenant-level energy simulation
    Demonstrate a 3% improvement in the proposed performance rating compared with the baseline performance rating for portions of the building within the tenant’s scope of work. Calculate the baseline according to ANSI/ASHRAE/IESNA Standard 90.1–2010, Appendix G, with errata (or a USGBC-approved equivalent standard for projects outside the U.S.), using a simulation model for all tenant project energy use. Projects must meet the minimum percentage savings before application of renewable energy systems. The proposed design must meet the following criteria: Exception: the baseline project envelope must be modeled according to Table G3.1(5) (baseline), Sections a–e, and not Section f. Document the energy modeling input assumptions for unregulated loads. Unregulated loads should be modeled accurately to reflect the actual expected energy consumption of the tenant project. If unregulated loads are not identical for both the baseline and the proposed performance ratings, and the simulation program cannot accurately model the savings, follow the exceptional calculation method (ANSI/ASHRAE/IESNA Standard 90.1–2010, G2.5). Alternatively, use the COMNET modeling guidelines and procedures to document measures that reduce unregulated loads.

    OR

    Option 2. Prescriptive compliance
    Comply with the mandatory and prescriptive provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010, with errata (or a USGBC-approved equivalent standard for projects outside the U.S.).
    • Reduce connected lighting power density by 5% below ASHRAE 90.1-2010 using the space-by-space method or by applying the whole-building lighting power allowance to the entire tenant space.
    • Install ENERGY STAR appliances, office equipment, electronics, and commercial food service equipment (HVAC, lighting, and building envelope products are excluded) for 50% (by rated-power) of the total ENERGY STAR eligible products in the project. Projects outside the U.S. may use a performance equivalent to ENERGY STAR.

    Alternative Compliance Paths (ACPs)

    Canada ACP - NECB

    Projects in Canada may instead demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the National Energy Code for Buildings (NECB) 2011. The same percentage cost improvement in energy performance is required to meet the Prerequisite, and the same points for cost percentage improvement in energy performance are applicable for the Credit.

    The following conditions (where applicable) must be met. Note that unless otherwise noted, CanQUEST (the Canadian energy modelling software based on eQUEST that performs NECB 2011 compliance runs) does not implement many of these conditions correctly and would require corresponding modifications to the Reference case.

    1. Comply with mandatory requirements of ASHRAE 90.1-2010
    2. ASHRAE 90.1-2010 mandatory requirements must be met, in addition to the performance path limitations referenced in the NECB 2011 Sections 3.4.1.2, 5.4.1.2 and 6.4.1.2. In cases where ASHRAE and the NECBC reference requirements concerning the same item, the more stringent requirement shall be adhered to.

      The following exceptions apply:

    • ASHRAE 90.1-2010 mandatory items 6.4.3.9, 9.4.1.2b, 9.4.1.4, 9.4.1.5, 9.4.3
  • Apply fenestration area convention similar to ASHRAE 90.1-2010
  • Maintain the same FWR (as defined by NECB, including doors) for the Reference as exists in the Proposed Design, up to the prescribed maximum. If the Proposed Design’s FWR exceeds the prescribed FWR, scale down the fenestrations in the Reference case accordingly.

  • Apply skylight area convention similar to ASHRAE 90.1-2010
  • Maintain the same SRR for the Reference as exists in the Proposed Design, up to the prescribed 5% maximum. If the Proposed Design’s SRR exceeds 5%, scale down the skylights in the Reference case accordingly.

  • Model proposed and reference outside air similar to ASHRAE 90.1-2010
  • Proposed and reference (baseline) outside air rates shall be modeled as per ASHRAE 90.1 – 2010 (G3.1.2.6).

  • Apply ASHRAE kitchen exhaust demand ventilation requirements
  • Provide for the same demand ventilation requirements as described in ASHRAE Appendix G3.1.1.d.

  • Apply ASHRAE’s chiller heat recovery requirements
  • Provide for the same chiller heat recovery requirements as applies to ASHRAE.

  • Apply supply air temperature reset controlled based on warmest zone
  • Reset the minimum supply air temperature to satisfy the cooling requirements of the warmest zone, as stipulated in NECB Section 5.2.8.8. Note that this control setting is already corrected in CanQUEST for the Reference case.

  • Account for uninsulated structural penetrations if they exceed 2% of net wall area
  • The 2% allowance may be applied, but based on the net opaque wall area, not the entire building envelope area.

  • Follow ASHRAE/LEED rules for renovations to existing buildings
  • Model existing components consistent with ASHRAE and LEED provisions.

  • Account for all anticipated energy use in building
  • Fully account for all energy end-uses in the energy performance modelling.

  • DES Systems are to be modeled according to Option 1, Path 1 or Option 1, Path 2 as indicated in the LEED v4 Reference Guide
  • The following exceptions apply:

    • Option 1, Path 1 - Do not apply ASHRAE 90.1-2010 requirements for purchased heating and cooling. Under this ACP, purchased heating and cooling (as applicable) are modeled as cost-neutral in the baseline and proposed case. Local rates for purchased heating (fossil fuel based) and cooling are used to establish the purchased heating and cooling costs. The energy model's scope accounts for only downstream equipment, plus purchased heating and cooling. NECB clause 8.4.3.6 does not apply for LEED projects.
    • Model baseline systems in accordance with NECB requirements, with DX coils replaced with chilled water coils if purchased cooling is present and fossil-fired furnaces replaced with hot water coils if purchased heating is present.
    • Option 1, Path 2: Do not apply ASHRAE 90.1-2010 requirements for baseline systems. Model baseline systems in accordance with NECB requirements for onsite generated equipment (i.e. assume building is not connected to a DES and the proposed building is modeled with a virtual plant according to LEED v4 Reference Guide requirements).

    Cost estimates for this credit

    On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.

    Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.

    This information is also available in a full PDF download in The Cost of LEED v4 report.

    Learn more about The Cost of LEED v4 »

    In the end, LEED is all about documentation. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with:

    • Calculators to help assess credit compliance.
    • Tracking spreadsheets for materials purchases.
    • Spreadsheets and forms to give to subs and other team members.
    • Guidance documents on arcane LEED issues.
    • Sample templates to help guide your narratives and LEED Online submissions.
    • Examples of actual submissions from certified LEED projects.

    Our proposed design has insulation R-values that are below those prescribed by ASHRAE 90.1-2010. Can we still meet the prerequisite?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Do the required savings for this prerequisite (and credit) need to come only from building energy, or also process loads?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Our project doesn't have enough energy savings to earn the prerequisite. Can we get there by incorporating onsite renewables?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Does the base building information need to be included in the minimum energy performance calculator, or is it sufficient to just include the tenant space?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    Are there any exceptions to the daylight control requirement of ASHRAE 90.1–2010?

    The answer to this question is available to LEEDuser premium members. Start a free trial »

    (If you're already a premium member, log in here.)

    4/21/2023Updated: 4/21/2023
    Reference Guide Correction
    Description of change:
    Revise the legend for the third calculation in the CHP Modeling Guidance to the following:

    Under "where…":

    Replace "Proposed CHP_ELECbldg" with "BLDGfuel"
    Replace "CHP_ELECtotal" with "CHP_ ELECbldg"

    Campus Applicable
    No
    Internationally Applicable:
    No
    4/9/2021Updated: 6/10/2021
    Form Update
    Description of change:
    Summary tab: revise rounding on the Summary output tab to round down (i.e. the same as the rounding on the Performance outputs tab).
    Campus Applicable
    No
    Internationally Applicable:
    No
    4/6/2018Updated: 11/6/2020
    Reference Guide Correction
    Description of change:
    Add the following to the bottom of the International Tips section:

    "Developed by members of the European Roundtable, this table provides further guidance for project teams in Europe wishing to use European standards in lieu of certain ASHRAE 90.1-2010 mandatory provisions in LEED v4. The guidance covers ASHRAE 90.1-2010 Mandatory Provision Sections 5.4, 6.4, 7.4, 8.4, 9.4 and 10. Column 1 of the table references the specific subsection used in ASHRAE 90.1-2010. Column 2 displays the requirement as written in ASHRAE 90.1-2010. Column 3 outlines the compliance pathway available for European projects. Column 4 includes, in some cases, further information about the proposal, differences between the proposal and the ASHRAE requirement, or a reference to further documentation.

    Please refer back to the LEED v4 web-based reference guide (Further Explanation > International Tips > Europe) for further information on the regional alternative compliance path.

    Additionally, for projects using the Performance Option for compliance with EAp2: Minimum Energy Performance and EAc1: Optimize Energy Performance, the documentation must also use the calculated U-factor for fenestration products including windows and skylights based on either the LBNL Windows 6 program, or a simulation software program that approximates the NFRC rating methodologies. Alternatively, a narrative shall be provided supporting the claim that the fenestration U-factor used in the model is similar to the values that would be achieved using the NFRC rating. The CE-marked fenestration does not account for thermal bridging and seasonal performance in the same way as the NFRC rating, and when accounted for in the energy model, has been observed to lead to savings that exceed those claimed for the same fenestration rated under the NFRC ratings."
    Campus Applicable
    No
    Internationally Applicable:
    No
    4/6/2018Updated: 11/6/2020
    Regional ACP
    Description of change:
    Add the following to the bottom of the International Tips section:

    "Developed by members of the European Roundtable, this table provides further guidance for project teams in Europe wishing to use European standards in lieu of certain ASHRAE 90.1-2010 mandatory provisions in LEED v4. The guidance covers ASHRAE 90.1-2010 Mandatory Provision Sections 5.4, 6.4, 7.4, 8.4, 9.4 and 10. Column 1 of the table references the specific subsection used in ASHRAE 90.1-2010. Column 2 displays the requirement as written in ASHRAE 90.1-2010. Column 3 outlines the compliance pathway available for European projects. Column 4 includes, in some cases, further information about the proposal, differences between the proposal and the ASHRAE requirement, or a reference to further documentation.

    Please refer back to the LEED v4 web-based reference guide (Further Explanation > International Tips > Europe) for further information on the regional alternative compliance path.

    Additionally, for projects using the Performance Option for compliance with EAp2: Minimum Energy Performance and EAc1: Optimize Energy Performance, the documentation must also use the calculated U-factor for fenestration products including windows and skylights based on either the LBNL Windows 6 program, or a simulation software program that approximates the NFRC rating methodologies. Alternatively, a narrative shall be provided supporting the claim that the fenestration U-factor used in the model is similar to the values that would be achieved using the NFRC rating. The CE-marked fenestration does not account for thermal bridging and seasonal performance in the same way as the NFRC rating, and when accounted for in the energy model, has been observed to lead to savings that exceed those claimed for the same fenestration rated under the NFRC ratings."
    Campus Applicable
    No
    Internationally Applicable:
    No
    7/10/2020Updated: 7/10/2020
    Form Update
    Description of change:
    add "Dining Area" space type to the dropdown list under "Table 9.6.1 Space Type" in the lighting tab.
    Campus Applicable
    No
    Internationally Applicable:
    No
    7/1/2014Updated: 3/29/2018
    Regional ACP
    Description of change:
    Add the following as a USGBC-approved equivalent standard for projects outside the U.S.

    "Projects in Canada may instead demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the National Energy Code for Buildings (NECB) 2011. The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit.

    The following conditions (where applicable) must be met. Note that unless otherwise noted, CanQUEST (the Canadian energy modelling software based on eQUEST that performs NECB 2011 compliance runs) does not implement these conditions correctly and would require corresponding modifications to the Reference case.

    1. Comply with mandatory requirements of ASHRAE 90.1-2010
    ASHRAE 90.1-2010 mandatory requirements must be met, in addition to the performance path limitations referenced in the NECB 2011 Sections 3.4.1.2, 5.4.1.2 and 6.4.1.2. In cases where ASHRAE and the NECBC reference requirements concerning the same item, the more stringent requirement shall be adhered to.

    2. Apply fenestration area convention similar to ASHRAE 90.1-2010
    Maintain the same FWR (as defined by NECB, including doors) for the Reference as exists in the Proposed Design, up to the prescribed maximum. If the Proposed Design’s FWR exceeds the prescribed FWR, scale down the fenestrations in the Reference case accordingly.

    3. Apply skylight area convention similar to ASHRAE 90.1-2010
    Maintain the same SRR for the Reference as exists in the Proposed Design, up to the prescribed 5% maximum. If the Proposed Design’s SRR exceeds 5%, scale down the skylights in the Reference case accordingly.

    4. Model proposed and reference outside air similar to ASHRAE 90.1-2010
    Proposed and reference (baseline) outside air rates shall be modelled as per ASHRAE 90.1 – 2010 (G3.1.2.6).

    5. Apply ASHRAE kitchen exhaust demand ventilation requirements
    Provide for the same demand ventilation requirements as described in ASHRAE Appendix G3.1.1.d.

    6. Apply ASHRAE’s chiller heat recovery requirements
    Provide for the same chiller heat recovery requirements as applies to ASHRAE.

    7. Apply supply air temperature reset controlled based on warmest zone
    Reset the minimum supply air temperature to satisfy the cooling requirements of the warmest zone, as stipulated in NECB Section 5.2.8.8. Note that this control setting is already corrected in CanQUEST for the Reference case.

    8. Account for uninsulated structural penetrations if they exceed 2% of net wall area
    The 2% allowance may be applied, but based on the net opaque wall area, not the entire building envelope area.

    9. Follow ASHRAE/LEED rules for renovations to existing buildings
    Model existing components consistent with ASHRAE and LEED provisions.

    10. Account for all anticipated energy use in building
    Fully account for all energy end-uses in the energy performance modeling."
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/25/2017Updated: 8/1/2017
    Form Update
    Description of change:
    v2009/v4 Minimum Energy Performance Calculator:
    • Fixed formatting issues in the Performance Outputs tab
    • Corrected calculation within the Service Water Heating tab.
    Campus Applicable
    Yes
    Internationally Applicable:
    Yes
    4/14/2017Updated: 4/24/2017
    Reference Guide Correction
    Description of change:
    In the Project Type Variations section, under Path 1. ASHRAE 90.1-2010, Appendix G, at the bottom of the section with the title "Energy Rates" in italics, insert the following guidance for projects where no tariffs or rates are available from the district energy system servicing the project:

    "Energy Rates for Path 1:
    • If tariffs or rates are not available from the district plant servicing the project (e.g. for campus or military plants), calculate the rates based on the virtual electric and fossil fuel rates from the model:
    o If a flat rate structure is being used for all energy sources (meaning the cost per unit energy is the same throughout the year, and there are no demand charges), then these flat rates simply become the virtual energy rates for the project.
    o Otherwise, if all energy rate structures are not flat, then a preliminary run of the Option 1 Baseline Case energy model must first be completed to identify the virtual electric and fossil fuel rates for the project. For this preliminary run only, the rate for the DES-supplied energy may be left blank, or may be entered as any value.
    o Once all the virtual energy rates are known for electricity and fossil fuel, the virtual DES rates for both the Baseline and Proposed Case are then derived as follows:
    District Chilled Water Rate:
    Units of $/(Btu x 106) = Virtual Electric Rate (in $/kWh) x 71
    Units of $/ton-hour = Virtual Electric Rate (in $/kWh) x 0.85
    Units of $/kWh = Virtual Electric Rate (in $/kWh) x 0.24
    District Hot Water Rate:
    Units of $/(Btu x 106) = Virtual Fuel Rate (in $/(Btu x 106)) x 1.59 + Virtual Electric Rate (in $/kWh) x 3
    Units of $/kWh = Virtual Fuel Rate (in $/kWh) x 1.59 + Virtual Electric Rate (in $/kWh) x 0.01
    Units of $/therm = Virtual Fuel Rate (in $/therm) x 1.59 + Virtual Electric Rate (in $/kWh x 0.3)

    District Steam Rate:
    Units of $/ (Btu x 106) = Virtual Fuel Rate (in $/(Btu x 106)) x 1.81 + Virtual Electric Rate (in $/kWh) x 3
    Units of $/kWh = Virtual Fuel Rate (in $/kWh) x 1.81 + Virtual Electric Rate (in $/kWh) x 0.01
    Units of $/therm = Virtual Fuel Rate (in $/therm) x 1.81 + Virtual Electric Rate (in $/kWh x 0.3)

    o Exception: to obtain the virtual fuel rate when the connected building does not use fossil fuel but the DES central plant does, use a flat rate consistent with the central plant rates or the historic average local market rates (no preliminary model run is needed). The virtual fuel rates must match in the Baseline and Proposed Case.
    o The virtual DES rates are then input into the modeling software for each DES source and used for the remainder of the process. Alternatively, the virtual DES rates may be used to calculate the DES energy costs directly by multiplying the DES energy consumption for each DES source by its virtual DES rate. All virtual DES energy rates must be identical in the Baseline and Proposed Case."

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    4/14/2017Updated: 4/19/2017
    Form Update
    Description of change:
    • Functionality has been added to allow for eQUEST and TRACE files to be automatically imported into the calculator.
    • Bug fixes for the Opaque Assemblies, Shading and Fenestration, and Schedules tabs.
    • Bug fixes for the Service Hot Water Flow calculations.
    • Bug Fixes for Schedules tab
    • v2009 Only – Bug fix to allow macros to make automatic changes for LEED v3 BD+C: Multifamily Midrise
    • v2009 Only – ASHRAE 90.1-2010 requirement has been removed from the General HVAC tab confirmation boxes.
    Campus Applicable
    Yes
    Internationally Applicable:
    Yes
    4/14/2017Updated: 4/14/2017
    Reference Guide Correction
    Description of change:
    Delete the third bullet point:

    "The baseline case must follow Appendix G requirements for all components and systems, including the building envelope. Existing conditions are not permitted to be modeled for the baseline case."
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    9/13/2016Updated: 11/15/2016
    Form Update
    Description of change:
    (calculator dated 8/23/2016, published 9/13/2016)
    • Baseline System Helpful Notes Section has been updated in the Water-Side HVAC tab
    • District energy system (DES) Path 3 calculations have been revised
    • Optional notes column has been added to each tab for project teams to provide further clarification
    • Exceptional calculation formulas have been revised
    • Performance upgrade to the General Information tab has been implemented
    • Baseline case fan power formulas have been updated
    • Lighting table language has been updated (v2009)
    • Exterior lighting quality assurance (QA) checks have been updated
    • Further guidance has been provided for determining unitary cooling efficiency in the Helpful Notes section of the Air-Side HVAC tab
    • Performance Outputs tab formulas have been revised to be more robust for multiple building projects
    • Summary tab formulas have been revised to reference total cost savings with and without renewable energy contribution
    • Receptacle Equipment Modeling Method tables have been revised to be more robust for multiple building projects
    Campus Applicable
    No
    Internationally Applicable:
    No
    7/1/2015Updated: 7/1/2015
    Reference Guide Correction
    Description of change:
    After the first paragraph, add the following:/n

    "For an expanded reference of international locations, ASHRAE 169-2013 Table A-5 (Canada) or Table A-6 (International) may be consulted. ASHRAE 169-2013 subdivides Climate Zone 1 into two climate zones (Climate Zone 1 and Climate Zone 0). Locations listed in ASHRAE 169-2013 in Climate Zone 1 and Climate Zone 0 should be considered Climate Zone 1 under ASHRAE 90.1-2010."
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    10/1/2014Updated: 2/14/2015
    Reference Guide Correction
    Description of change:
    Revise footnote #1 to:

    ANSI/ASHRAE/IES 90.1–2010 Final Determination Quantitative Analysis, p. 29, https://www.energycodes.gov/sites/default/files/documents/BECP_FinalQuan... (accessed July 11, 2014).
    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/1/2015
    LEED Interpretation
    Inquiry:

    For projects located in California, can the 2013 Title 24 Part 6 California Energy Code be used to demonstrate compliance in lieu of ASHRAE 90.1-2010?

    Ruling:

    Instead of ASHRAE 90.1-2010 Appendix G, projects in California may demonstrate compliance with the 2013 Title 24 Part 6 California Energy Code using the Performance method. The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit.
    The following conditions (where applicable) must be met:
    • Energy Cost shall be used as the performance metric rather than TDV energy. Exception: A Pilot ACP allowing alternate metrics may be applied as applicable.
    • Model all process energy consumption within and associated with the building as designed. Model all enclosed building spaces within and associated with the building even if the space types are not regulated by Title-24.
    • BD+C: Major renovations must be modeled using the Title-24 new construction modeling requirements for HVAC, DHW, and lighting (as opposed to existing conditions). However, for LEED-BD&C, the baseline envelope conditions may be modeled using existing conditions prior to renovation.
    • ID+C: The energy model must be modeled using the Title-24 new construction requirements for HVAC, DHW, lighting and envelope.

    Campus Applicable
    Yes
    Internationally Applicable:
    No
    10/1/2014
    LEED Interpretation
    Inquiry:

    The ENERGY STAR program is continuously releasing new and updated standards for products. Project teams may be unaware that a product they are purchasing is subject to an ENERGY STAR standard. Can a project team exclude equipment covered by recently developed ENERGY STAR product specifications from the prerequisite and credit calculations? If all equipment must be included, are teams required to use the rated power or can teams “discount” the rated power to reflect average consumption or actual operating power demand? And how should international projects apply this to new ENERGY STAR product specifications or other equipment or appliances where an ENERGY STAR option is not available locally?

    Ruling:

    As required in LEED Interpretation 10044, all equipment classified as eligible by ENERGY STAR must be included in the calculations. Equipment that is procured within two years of the effective date of the first (i.e. Version 1.0) ENERGY STAR product specification for that equipment category may be included or excluded at the discretion of the project team; however, all equipment within that category must be included or excluded consistently. Refer to the ENERGY STAR product specification(s) for the effective date.

    Calculations may be completed using either the rated power OR the average annual power consumption, but the metric selected must be consistent for all equipment included in the calculations. For the purposes of demonstrating equivalency to the ENERGY STAR product specification by average annual power consumption, equipment purchased may use no more than the average annual energy consumption of the equivalent ENERGY STAR-qualified product as determined by the appropriate ENERGY STAR savings calculator. The average annual power consumption for purchased equipment may be demonstrated by manufacturer documentation or calculated from actual equipment operating data and anticipated use profiles.

    For Uninterruptible Power Supply (UPS) equipment:

    If using the rated power methodology, the UPS “rated power” for the LEED Calculation may optionally be derated to 35% of the UPS Rated Output Power to more accurately reflect the relative energy usage associated with UPS equipment compared to other Energy Star equipment.

    If using the average annual power consumption methodology, the UPS average annual power consumption (in units of kWh/year) shall be calculated as:
    UPS Annual Power Consumption = 6,600 x Power x (1-EffAVGMIN)

    Where:

    Power is the UPS Rated Output Power in units of kW.

    EffAVGMIN is determined consistently with the ENERGY STAR® Program Requirements, or 93.7% if unknown.

    For projects located outside of the United States, the following approved standards may be used in place of ENERGY STAR for equipment categories covered by these standards: EU ENERGY STAR, TCO, Blue Angel. Additionally, equipment classified as eligible by ENERGY STAR but not ENERGY STAR-qualified may be deemed equivalent if the equipment has been labeled by a local energy label and has been rated by the labeling program to use no more than the average annual energy consumption of the equivalent ENERGY STAR-qualified product as determined by the appropriate ENERGY STAR savings calculator.

    Updated 01/05/18 for rating system version applicability and to provide additional calculation options for Uninterruptible Power Supply equipment.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/2/2018
    LEED Interpretation
    Inquiry:

    Our project is located in California. To pursue Option 1: Whole Building Simulation, is there a methodology for documenting additional energy performance for LEED v4 projects regulated by Title 24-2016?

    Ruling:

    Project Type1
    Additional Percent Savings

    NC-Office
    7%

    NC-Retail (except restaurant/grocery)
    8%

    NC-School
    7%

    NC-Health Care
    0%

    NC-Restaurant/Grocery
    0%

    NC-Hospitality
    8%

    NC-Warehouse
    0%

    NC-Multifamily
    8%

    NC-All Other
    0%

    CS-Office
    5%

    CS-Retail (except restaurant/grocery)
    7%

    CS-School
    5%

    CS-Health Care
    0%

    CS-Restaurant/Grocery
    0%

    CS-Hospitality
    7%

    CS-Warehouse
    0%

    CS-Multifamily
    7%

    CS-All Other
    0%

    CI-Office
    6%

    CI-Retail (except restaurant/grocery)
    7%

    CI-School
    6%

    CI-Health Care
    0%

    CI-Restaurant/Grocery
    0%

    CI-Hospitality
    7%

    CI-Warehouse
    0%

    CI-Multifamily
    7%

    CI-All Other
    0%

    Campus Applicable
    No
    Internationally Applicable:
    No
    1/4/2016
    LEED Interpretation
    Inquiry:

    Where the local code does not require vestibules or allows alternatives, can the project team take a penalty for not including vestibules in the design model?

    Ruling:

    Yes, in locations where the local code does not require vestibules or revolving doors the project team may choose one of the two options below. Additionally, all projects using this method must provide a narrative explaining how infiltration and exfiltration of air through building entries is addressed in the design.

    1. Manual subtraction of the energy cost savings associated with vestibules as conservatively estimated by PNNL-20026 “Energy Saving Impact of ASHRAE 90.1 Vestibule Requirements: Modeling of Air Infiltration through Door Openings”. Refer to the Related Resource “Default Deduction for Vestibules” for the specific percentage subtraction required based on project type and climate zone.
    2. Provide detailed exceptional calculation method calculations with each step of the calculation clearly described and in alignment with the analysis performed in PNNL-20026, but specific to the project building. Document the additional energy consumption of the project building associated with removing the vestibules from the project. No credit will be given for the use of air curtains when using this approach. A sensitivity analysis related to the number of occupants entering on an hourly basis would need to be justified. The narrative would also need to justify that the simulation software is capable of addressing the conditions required for the calculation. (Software with a well-mixed air assumption would not be able to apply this modeling approach).

    ***Update 11/9/20: This ruling is now applicable to LEED v4.1 BD+C and ID+C projects.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/1/2015
    LEED Interpretation
    Inquiry:

    For projects located in Seattle, can the 2012 Seattle Energy Code be used to demonstrate compliance in lieu of ASHRAE 90.1-2010?

    Ruling:

    Instead of ASHRAE 90.1-2010 Appendix G, projects in Seattle may demonstrate compliance with with all mandatory provisions of the 2012 Seattle Energy Code AND demonstrate a percentage improvement in the proposed building performance rating compared with the baseline according to the 2012 Seattle Energy Code Total Building Performance (Section C407). The same percentage improvement in energy performance is required to meet the Prerequisite, and the same points for percentage improvement in energy performance are applicable for the Credit.
    The following conditions (where applicable) must be met:
    • Energy Cost shall be used as the performance metric rather than site energy (versus Section C407.3 which indicates that site energy shall be used). Exception: A Pilot ACP allowing alternate metrics may be applied as applicable.
    • Model proposed and reference outside air similar to ASHRAE 90.1-2010.
    o Proposed and reference (baseline) outside air rates shall be modeled as per ASHRAE 90.1 – 2010 (G3.1.2.6).
    • In addition to the documentation requirements established by the Seattle Energy Code, all required LEED documentation must be provided (and must include the same information as is required for ASHRAE 90.1-2010, with all baseline and proposed inputs shown) including:
    o The LEED EAp2: Minimum Energy Performance form
    o The LEED EAc1: Optimize Energy Performance form
    o The LEED v4 Minimum Energy Performance Calculator (http://www.usgbc.org/resources/minimum-energy-performance-calculator) (or a document with equivalent information) with Baseline inputs updated to refer to Seattle Energy Code.
    • Multifamily high-rise and dormitory projects are not eligible for this alternative compliance path.
    • BD+C: The equivalence applies for new construction only and does not apply to major renovations.
    • ID+C: The energy model must be modeled using the Title-24 new construction requirements for HVAC, DHW, lighting and envelope.

    Campus Applicable
    Yes
    Internationally Applicable:
    No
    10/17/2016
    LEED Interpretation
    Inquiry:

    Can commercial interiors projects use the existing envelope in the baseline energy model in Option 1 of LEED v4 ID+C Energy and Atmosphere (EA) prerequisite Minimum Energy Performance and EA credit Optimize Energy Performance?

    Ruling:

    Yes. As an alternative to modeling the ASHRAE 90.1 Appendix G prescriptive new construction envelope requirements in the Baseline, project teams may use the existing envelope in the baseline energy model per ASHRAE 90.1-2010 Table G.3.1.5 (baseline) f, subject to revised percentage improvement thresholds for (EA) prerequisite Minimum Energy Performance and EA credit Optimize Energy Performance outlined below.

    Project teams modeling the existing envelope in the baseline must demonstrate 5% performance improvement under EA prerequisite Minimum Energy Performance, and must demonstrate a 2% performance improvement above established performance thresholds in EA credit Optimize Energy Performance to earn the corresponding number of points. For example, project teams must demonstrate 6% performance improvement to achieve 4 points, 7% performance improvement to achieve 6 points, 8% performance improvement to achieve 8 points, etc. Project teams must demonstrate 30% performance improvement to achieve 25 points under EA credit Optimize Energy Performance.

    Campus Applicable
    No
    Internationally Applicable:
    Yes
    7/2/2018
    LEED Interpretation
    Inquiry:

    Our project is subject to ASHRAE Standard 90.1-2013 for code compliance. To pursue Option 1: Whole Building Simulation, is there a methodology for documenting additional energy performance for LEED v4 projects regulated by ASHRAE Standard 90.1-2013?

    Ruling:

    Yes, projects applying Option 1: Whole Building Simulation, and regulated by ASHRAE Standard 90.1-2013 may document additional energy performance improvement under LEED v4 EA credit Optimize Energy Performance as described below. The Appendix G modeling method must be used for the LEED submission, even if the Energy Cost Budget method is used to document local code compliance.

    Projects may calculate the Equivalent ASHRAE 90.1-2010 Performance improvement as:
    Equivalent performance Improvement = % better than ASHRAE 90.1-2013 + Additional Percent Savings

    Where Additional Percent Savings is shown in Table 1:

    Table 1: Additional Percent Savings for ASHRAE 90.1-2013

    Project Type1 Additional Percent Savings
    NC-Office 5%
    NC-Retail (except restaurant/grocery) 5%
    NC-School 6%
    NC-Health Care 3%
    NC-Restaurant / Grocery 3%
    NC-Hospitality 5%
    NC-Warehouse 1%
    NC-Multifamily 3%
    NC-All Other 2%
    CS-Office 3%
    CS-Retail (except restaurant/grocery) 3%
    CS-School 6%
    CS-Health Care 1%
    CS-Restaurant / Grocery 2%
    CS-Hospitality 3%
    CS-Warehouse 0%
    CS-Multifamily 1%
    CS-All Other 1%
    CI-Office 3%
    CI-Retail (except restaurant/grocery) 4%
    CI-School 6%
    CI-Health Care 2%
    CI-Restaurant / Grocery 3%
    CI-Hospitality 4%
    CI-Warehouse 0%
    CI-Multifamily 1%
    CI-All Other 2%

    1 Mixed use buildings shall use the weighted average Additional Percent Savings based on the gross enclosed floor area associated with each building type. Unfinished spaces not submitted in the CS rating system shall use the CS values. Data center space must always be considered “All Other”.

    Campus Applicable
    No
    Internationally Applicable:
    No
    7/8/2017
    LEED Interpretation
    Inquiry:

    ASHRAE 90.1-2010 mandatory requirement 8.4.2 Automatic Receptacle Control applies to 125 Volt receptacles in private offices, open offices, and computer classrooms. Are there any cases where exceptions to these mandatory requirements will be allowed?

    Ruling:

    The project team is requesting clarification regarding how to model spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. Projects using one of the following two compliance paths are exempt from the receptacle control requirements:

    1. Path 1: Projects Using Option 1. Whole Building Energy Simulation may model a penalty in the Proposed model for the spaces where mandatory ASHRAE 90.1 receptacle controls are not implemented. The following modeling requirements apply:
    • The receptacle power density modeled for these spaces shall be the greater of 0.75 Watts per square foot (8.1 Watts per square meter) or the design coincident peak receptacle power density (if known).
    • The receptacle schedule modeled in the Baseline for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than:
    o The ASHRAE 90.1-2010 User’s Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year)
    OR
    o 120% of the occupied hours of operation for the facility
    OR
    o Detailed justification shall be provided supporting an alternate schedule.

    • The Proposed model shall include either a 20% increase in the receptacle power density for these spaces OR a 20% increase in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Baseline model.

    2. Path 2: Projects must demonstrate that the project has implemented efficiency measures that will achieve an equal or greater reduction in receptacle energy consumption, and will persist for a similar timeframe to those achieved by ASHRAE 90.1-2010 Section 8.4.2. It is recommended that a Credit Interpretation Request be submitted when pursuing this approach. The project must provide documentation regarding the receptacle equipment controls that will be implemented for the project; and must provide justification supporting the claim that the savings over the life of the efficiency measure will be similar to those anticipated for a project compliant with Section 90.1-2010 Section 8.4.2. Note: The baseline and proposed receptacle energy consumption for these spaces must be modeled identically if using this approach; the project is not eligible for any further receptacle savings in these spaces using the Exceptional Calculation Method.

    Update 11/9/20:
    Where ASHRAE 90.1 receptacle controls are not implemented in accordance with Section 8.4.2 mandatory requirements, LEED v4.1 projects may apply either Path 1 or Path 2, subject to the following requirements for Path 1:
    • Path 1: LEED v4.1 projects Using the Appendix G Performance Rating Method may model a penalty in the energy model. The following modeling requirements apply:
    o The Proposed receptacle power density modeled for these spaces shall be the greater of 0.75 Watts per square foot (8.1 Watts per square meter) or the design coincident peak receptacle power density (if known)
    o The receptacle schedule modeled in the Proposed design for these spaces shall have a minimum Equivalent Full Load Hours of operation no less than: the ASHRAE 90.1-2016 User’s Manual default schedule for office occupancy (2,920 Equivalent Full Load Hours per year); or 120% of the occupied hours of operation for the facility; or detailed justification shall be provided supporting an alternate schedule.
    o The Baseline model shall include either a 20% decrease in the receptacle power density for these spaces OR a 20% decrease in the scheduled receptacle Equivalent Full Load Hours of Operation versus the Proposed model.

    Campus Applicable
    No
    Internationally Applicable:
    Yes

    LEEDuser expert

    Marcus Sheffer

    7group / Energy Opportunities
    LEED Fellow

    See all LEEDuser forum discussions about this credit » Subscribe to new discussions about Hospitality-CI-v4 EAp2 View the LEED v4.1 version of this credit