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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Requirements
Establish an energy performance target no later than the schematic design phase. The target must be established as kBtu per square foot-year (kWh per square meter-year) of source energy use.
Choose one of the options below.
Option 1. Whole-building energy simulation (1–18 points except Schools and Healthcare, 1–16 points Schools, 1–20 points Healthcare)
Analyze efficiency measures during the design process and account for the results in design decision making. Use energy simulation of efficiency opportunities, past energy simulation analyses for similar buildings, or published data (e.g., Advanced Energy Design Guides) from analyses for similar buildings.
Analyze efficiency measures, focusing on load reduction and HVAC-related strategies (passive measures are acceptable) appropriate for the facility. Project potential energy savings and holistic project cost implications related to all affected systems.
Project teams pursuing the Integrative Process credit must complete the basic energy analysis for that credit before conducting the energy simulation.
Follow the criteria in EA Prerequisite Minimum Energy Performance to demonstrate a percentage improvement in the proposed building performance rating compared with the baseline. Points are awarded according to Table 1.
Table 1. Points for percentage improvement in energy performance
New Construction |
Major Renovation |
Core and Shell |
Points (except Schools, Healthcare) |
Points Healthcare |
Points Schools |
|---|---|---|---|---|---|
6% |
4% |
3% |
1 |
3 |
1 |
8% |
6% |
5% |
2 |
4 |
2 |
10% |
8% |
7% |
3 |
5 |
3 |
12% |
10% |
9% |
4 |
6 |
4 |
14% |
12% |
11% |
5 |
7 |
5 |
16% |
14% |
13% |
6 |
8 |
6 |
18% |
16% |
15% |
7 |
9 |
7 |
20% |
18% |
17% |
8 |
10 |
8 |
22% |
20% |
19% |
9 |
11 |
9 |
24% |
22% |
21% |
10 |
12 |
10 |
26% |
24% |
23% |
11 |
13 |
11 |
29% |
27% |
26% |
12 |
14 |
12 |
32% |
30% |
29% |
13 |
15 |
13 |
35% |
33% |
32% |
14 |
16 |
14 |
38% |
36% |
35% |
15 |
17 |
15 |
42% |
40% |
39% |
16 |
18 |
16 |
46% |
44% |
43% |
17 |
19 |
- |
50% |
48% |
47% |
18 |
20 |
- |
OR
Option 2. Prescriptive compliance: ASHRAE Advanced Energy Design Guide (1–6 points)
To be eligible for Option 2, projects must use Option 2 in EA Prerequisite Minimum Energy Performance.
Implement and document compliance with the applicable recommendations and standards in Chapter 4, Design Strategies and Recommendations by Climate Zone, for the appropriate ASHRAE 50% Advanced Energy Design Guide and climate zone. For projects outside the U.S., consult ASHRAE/ASHRAE/IESNA Standard 90.1–2010, Appendixes B and D, to determine the appropriate climate zone.
ASHRAE 50% Advanced Energy Design Guide for Small to Medium Office Buildings- Building envelope, opaque: roofs, walls, floors, slabs, doors, and continuous air barriers (1 point)
- Building envelope, glazing: vertical fenestration (1 point)
- Interior lighting, including daylighting and interior finishes (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment and controls (1 point)
- Building envelope, opaque: roofs, walls, floors, slabs, doors, and vestibules (1 point)
- Building envelope, glazing: fenestration - all orientations (1 point)
- Interior lighting, excluding lighting power density for sales floor (1 point)
- Additional interior lighting for sales floor (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment choices and controls (1 point)
- Building envelope, opaque: roofs, walls, floors, slabs, and doors (1 point)
- Building envelope, glazing: vertical fenestration (1 point)
- Interior lighting, including daylighting and interior finishes (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment choices, controls, and kitchen equipment (1 point)
- Building envelope, opaque: roofs, walls, floors, slabs, doors, vestibules, and continuous air barriers (1 point)
- Building envelope, glazing: vertical fenestration (1 point)
- Interior lighting, including daylighting (form or nonform driven) and interior finishes (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment choices, controls, and kitchen equipment (1 point)
Pilot ACPs Available
The following pilot alternative compliance path is available for this credit. See the pilot credit library for more information.
EApc95: Alternative Energy Performance Metric ACP
EApc107 - Energy performance metering path
[view:embed_resource=page_1=7489432]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
The energy cost offset from onsite renewable energy cannot be used to demonstrate compliance with the prerequisite. Can this cost offset still be credited to the proposed energy cost savings for this credit?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.) |
Addenda
11/9/2020 – Updated: 12/7/2020
Regional ACP
Description of change:
Campus Applicable
No
Internationally Applicable:
No
7/1/2014 – Updated: 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."
As of 10/1/16, please note the following clarifications for the ACP language in the LEED credit library:
1. Clarify that the metric is cost.
2. Clarify that CanQUEST does not implement many of the ASHRAE 90.1-2010 conditions.
3. Provide exemptions to a few 90.1 mandatory provisions, which are identified as exempt in the ACP calculator.
4. Provide guidance for projects with district energy systems – see condition #11 in ACP language.
"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."
As of 10/1/16, please note the following clarifications for the ACP language in the LEED credit library:
1. Clarify that the metric is cost.
2. Clarify that CanQUEST does not implement many of the ASHRAE 90.1-2010 conditions.
3. Provide exemptions to a few 90.1 mandatory provisions, which are identified as exempt in the ACP calculator.
4. Provide guidance for projects with district energy systems – see condition #11 in ACP language.
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
Projects subject to the v4 2024 update may apply the additional percent savings to each metric (cost, source energy, greenhouse gas emissions)
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”.
***Updated March 1, 2024 to align with changes in the LEED v4 Energy Update
Campus Applicable
No
Internationally Applicable:
No
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 or later?
Ruling:
Project Type(NC = New Construction)
(CS = Core & Shell or unfinished space)
(CI = Interior Fitout)
Additional Percent Savings
Title 24 2016 /
Title 24 2019
Title 24 2022 (or later)
Added to ASHRAE 90.1-2010 (v4)
Added to ASHRAE 90.1-2010 (v4)
Added to ASHRAE 90.1-2016 (v4.1)
TDV Energy (replacing cost & GHG metrics)
TDV Energy (replacing cost metric)
SOURCE Energy (replacing GHG metric)
TDV Energy (replacing cost metric)
SOURCE Energy (replacing GHG metric)
Building Design & Construction (BD+C):
NC - Office
7%
18%
20%
4%
6%
NC - Retail (except restaurant/grocery)
8%
25%
29%
10%
14%
NC - Restaurant / Grocery
0%
18%
20%
4%
6%
NC – School
7%
20%
25%
5%
10%
NC – Healthcare
0%
8%
8%
2%
2%
NC – Hospitality
8%
15%
20%
0%
5%
NC – Warehouse
0%
28%
28%
10%
10%
NC – Multifamily (4+ stories)
8%
16%
20%
4%
8%
Multifamily low-rise (<4 stories)1
8%
16%
20%
4%
8%
Single family residential1
8%
16%
20%
4%
8%
Data Center
0%
10%
10%
0%
0%
All Other (< 50% unregulated TDV)
0%
15%
15%
5%
5%
All Other (≥50% unregulated TDV)
0%
8%
8%
0%
0%
CS-Office
5%
12%
16%
1%
4%
CS-Retail (except restaurant/grocery)
7%
20%
25%
5%
10%
CS-Restaurant/grocery
0%
13%
15%
2%
3%
CS-School
7%
15%
20%
2%
8%
CS-Healthcare
0%
8%
8%
2%
2%
CS-Hospitality
7%
11%
15%
0%
4%
CS-Warehouse
0%
21%
21%
6%
6%
CS-Multifamily
7%
9%
13%
1%
4%
CS-All Other
0%
8%
8%
0%
0%
Interior Design & Construction (ID+C):
CI-Office
6%
Use v4.1
Use v4.1
0%
0%
CI-Retail (except restaurant/grocery)
7%
Use v4.1
Use v4.1
6%
6%
CI-Restaurant/grocery
0%
Use v4.1
Use v4.1
0%
0%
CI-School
7%
Use v4.1
Use v4.1
3%
3%
CI-Healthcare
0%
Use v4.1
Use v4.1
0%
0%
CI-Hospitality
7%
Use v4.1
Use v4.1
0%
0%
CI-Warehouse
0%
Use v4.1
Use v4.1
9%
9%
CI-Multifamily
7%
Use v4.1
Use v4.1
0%
0%
CI-All Other
0%
Use v4.1
Use v4.1
0%
0%
Campus Applicable
No
Internationally Applicable:
No
11/1/2011
LEED Interpretation
Inquiry:
LEED Core and Shell projects are is allowed to show energy savings associated with tenant improvement measures if documented in the lease agreement. Can anchor tenant leases, were executed well before the start of design, also be used? As a result of timing issues, it is not always practical to include specific energy efficiency measures in the lease agreement. Many of our tenants, especially supermarkets and other anchors, are extremely interested in energy efficiency and include these measures in their build-outs. All of these measures are documented in the tenants' construction drawings, which are typically completed simultaneously with the core and shell drawings. We desire to be able to include tenant energy efficiency measures that are documented in the tenants' construction drawings in the LEED for Core and Shell energy model. We would argue that this approach has more certainty and credibility than measures documented in the lease agreement. We would be using measures in permitted, final construction drawings, not requirements that were agreed to during lease negotiations. Please confirm that the LEED for Core and Shell project can include energy efficiency measures documented in the tenant's final construction drawings as part of the LEED for Core-and-Shell energy model.
Ruling:
The energy efficiency measures for tenant spaces documented in the tenant's final construction drawings can be used as part of the LEED Core and Shell energy model if the tenant signs a letter confirming that the final construction documents will be implemented as designed; that any modifications to the final construction documents will be evaluated for their impact on energy efficiency; and that the overall efficiency savings contributed by the tenant improvements will be maintained between the final construction documents and the construction phase. Applicable internationally.
Campus Applicable
No
Internationally Applicable:
Yes
7/8/2017
LEED Interpretation
Inquiry:
ASHRAE 90.1 Appendix G states: “Where a complete lighting system exists, the actual lighting power for each thermal block shall be used in the model.” This allows credit to be claimed in tenant spaces when “a complete lighting system” for these spaces designed and installed within the Core & Shell project scope of work. However, for tenant spaces in a Core & Shell building where tenant sales and lease agreements do not address future changes to the installed lighting, it is unclear what constitutes “a complete lighting system.”
If the documentation demonstrates that tenant space layout is complete, and that a lighting system has been designed and installed such that the tenants most likely to occupy the space can use the space for its intended function without alterations to the lighting system, shall this be considered a “complete lighting system”?
If space layout is incomplete, and a lighting system has been installed that provides adequate illumination for the open space in its current configuration, shall this be considered a “complete lighting system”?
Ruling:
For Projects registered prior to March 1, 2024:
Clarification is requested regarding the definition of a “complete lighting system” for projects where credit is claimed for lighting installed in tenant spaces within the Core & Shell project scope of work.
Core and Shell projects which design, install, and commission complete lighting systems, and demonstrate that the lighting is sufficient for the anticipated tenant uses may use the installed lighting power in the Proposed case energy model for EA Prerequisite: Minimum Energy Performance. All relevant ASHRAE 90.1 Section 9.4 Mandatory Provisions must be designed, installed, and commissioned in the tenant space within Core & Shell project scope of work.
Projects installing complete lighting systems in tenant spaces may not claim more than a 20% reduction in lighting power density for the purposes of prerequisite and credit achievement calculations. Alternatively, to claim more than 20% lighting power savings for a complete lighting system, the greater of the installed lighting power or the tenant required lighting power density may be modeled in the proposed case if a binding owner commitment letter with a sample tenant sales and lease agreement is provided establishing tenant lighting power requirements.
For Projects registered after March 1, 2024:
Clarification is requested regarding the definition of a “complete lighting system” for projects where credit is claimed for lighting installed in tenant spaces within the Core & Shell project scope of work.
Core and Shell projects which design, install, and commission complete lighting systems, and demonstrate that the lighting is sufficient for the anticipated tenant uses may use the installed lighting power in the Proposed case energy model for EA Prerequisite: Minimum Energy Performance. All relevant ASHRAE 90.1 Section 9.4 Mandatory Provisions must be designed, installed, and commissioned in the tenant space within Core & Shell project scope of work.
***Updated March 1, 2024 to remove the limit on savings for complete lighting systems and extend applicability to LEED v4.1.
Campus Applicable
No
Internationally Applicable:
Yes
4/2/2014
LEED Interpretation
Inquiry:
Clarification is requested regarding whether garage demand control ventilation may be modeled for credit. Garage Ventilation is not addressed by ASHRAE 90.1 – 2007, Appendix G, therefore if savings is claimed it must be modeled as an Exceptional Calculation Measure (ECM). Garage demand control ventilation is increasingly becoming standard practice in newly constructed buildings. In order to take credit for this measure as an ECM, it must be demonstrated that the proposed design goes beyond standard practice.
Ruling:
ECMs must be approved by the Rating Authority. As the Rating Authority for LEED projects, the GBCI will accept an ECM for garage demand control ventilation under the following circumstances:
1) Baseline case shall meet the requirements of ASHRAE 90.1-2010, Section 6.4.3.4.5 Enclosed Parking Garage Ventilation. Baseline fan volume shall be based on the minimum required ASHRAE 62.1 parking ventilation rates of 0.75 cfm / square foot. Baseline system fan power shall be calculated at 0.3 watts per CFM.
2) Proposed case shall reflect the actual design. Evidence shall be provided documenting that demand control ventilation strategies are sufficient to automatically detect contaminant levels of concern in parking garages (for example, Carbon Monoxide, Particulates, VOCs, etc. and NO2) and modulate airflow such that contaminant levels are maintained below specified contaminant concentration as identified in ASHRAE 62.1-2010 Addendum d. Evidence shall also be provided that contaminant sensors are placed in space in an appropriate manner for detection of contaminant in question, included in the building commissioning plan upon installation, and then calibrated yearly following installation.
The contaminants of concern that must be monitored may be limited to CO if a narrative is provided justifying how the controls will also help to limit NO2, VOCs and PM2.5 concentrations. The narrative should address how the parking garage minimum exhaust flow rate and/or the minimum fan run time (if applicable) are maintained, and provide clarification that other contaminant levels are expected to remain low based on that design. Note that NO2 would also be expected to be monitored in garages where more than 20% of the vehicles are anticipated to be diesel-fueled.
Note: though it does not need to be addressed specifically in the narrative, the project team must confirm compliance of all ASHRAE 62.1 mandatory measures, including the measure addressing “Buildings with Attached Parking Garages” requiring limitation of vehicular exhaust into adjacent spaces. .
3) If other activities occur in the garage area, the ventilation for these uses shall be in addition to garage vehicle ventilation.
4) Proposed case shall be modeled such that a minimum air flow of 0.05 cfm/square foot is maintained.
5) A narrative shall describe all Baseline and Proposed case assumptions included for this measure, and the calculation methodology used to determine the projected savings. The narrative and energy savings should be reported separately from the other efficiency measures in the LEED Form.
6) No more than a 75% fan energy savings shall be claimed for this measure.
UPDATED on 01/05/18 for rating system version applicability and in Section (2) to clarify that not all contaminants of concern must be continuously monitored.
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
1/10/2020
LEED Interpretation
Inquiry:
Our project is located in California and subject to compliance with Title 24 2019. Title 24 2019 has requirements for lighting power density more stringent than those requirements in ASHRAE 90.1-2010, and unfinished spaces in our project will be subject to the Title 24 2019 requirements.
For LEED credit compliance, our team plans to follow ASHRAE 90.1-2010 modeling. How can we document credit for Title 24 2019 compliant lighting in unfinished spaces?
Ruling:
Building Type*
Unfinished Space Lighting Power Density
Automotive Facility
0.70
Convention Center
0.80
Courthouse
0.80
Dining: Bar Lounge/Leisure
0.75
Dining: Cafeteria/Fast Food
0.70
Dining: Family
0.70
Dormitory
0.61
Exercise Center
0.70
Fire Station
0.71
Gymnasium
0.80
Healthcare Clinic
0.87
Hospital
1.05
Hotel
1.00
Library
0.95
Manufacturing Facility
0.90
Motel
0.88
Motion Picture Theater
0.75
Multifamily
0.60
Museum
1.06
Office
0.72
Parking Garage
0.17
Penitentiary
0.97
Performing Arts Theater
1.10
Police Station
0.96
Post Office
0.8
Religious Building
0.85
Retail: Grocery
1.05
Retail
1.00
School/University
0.72
Sports Arena
0.78
Town Hall
0.85
Transportation
0.60
Warehouse
0.55
Workshop
1.10
Campus Applicable
No
Internationally Applicable:
No
10/1/2015
LEED Interpretation
Inquiry:
Can the baseline model for refrigerated facilities be determined based on the IARW/IACSC Energy Modeling Guideline for Cold Storage and Refrigerated Warehouse Facilities as an exceptional calculation methodology under Appendix G?
Ruling:
Yes, project teams may use the IARW/IACSC Energy Modeling Guideline for Cold Storage and Refrigerated Warehouse Facilities as an exceptional calculation methodology when ASHRAE 90.1-2010 is used for compliance with EA Prerequisite Minimum Energy Performance. This guideline may not be used when an equivalent code is used for compliance unless approved by a project-specific Credit Interpretation Ruling. The following additional requirements apply:
1. Refrigerant type may not be used as an efficiency measure.
2. Table 1.4 must be completed for both the portions of the building complying with the IARW/IACSC Guideline as well as those following the standard ASHRAE 90.1 Appendix G requirements
3. If ASHRAE 62.1-2010 Addendum L is applied using the IARW/IACSC Guideline, it must be applied consistently throughout the project submittal.
4. Projects applying the IARW/IACSC Guideline may apply LEED Interpretation 10237 in order to claim energy savings for refrigeration equipment efficiency as an exceptional calculation methodology.
Internationally applicable as follows: The guidance applies to compliance paths using ASHRAE standards and cannot be applied to projects using an equivalent local code. Project teams wishing to apply this to an equivalent local code must obtain approval through a project-specific credit interpretation ruling.
This ruling supersedes the following LEED Interpretations: LI 5178, LI 2301, and LI 2026.
Campus Applicable
Yes
Internationally Applicable:
Yes
7/1/2014
LEED Interpretation
Inquiry:
There is significant confusion, and seemingly contradictory LEED Interpretations on the required methodology for addressing “purchased” on-site renewable energy, and/or purchased biofuel that is not considered on-site renewable energy within the LEED energy model. For renewable fuels meeting the requirements of Addendum 100001081 (November 1, 2011) or other purchased renewable fuels, how should purchased on-site renewable energy be treated in the LEED energy model? How should purchased bio-fuels (meaning it I not fossil fuel but is used in a similar manner to bio-fuel) be treated in the energy model?
Ruling:
For any on-site renewable fuel source that is purchased (such as qualifying wood pellets, etc.), or for biofuels not qualifying as on-site renewable fuel sources that are purchased, the actual energy costs associated with the purchased energy must be modeled in EA Prerequisite 2: Minimum Energy Performance and EA Credit 1: Optimize Energy Performance, and the renewable fuel source may not be modeled as "free", since it is a purchased energy source.
For non-traditional fuel sources (such as wood pellets) that are unregulated within ASHRAE 90.1, use the actual cost of the fuel, and provide documentation to substantiate the cost for the non-traditional fuel source. The same rates are to be used for the baseline and proposed buildings, with the following exception: If the fuel source is available at a discounted cost because it would otherwise be sent to the landfill or similarly disposed of, the project team may use local rates for the fuel for the baseline case and actual rates for the proposed case, as long as documentation is provided substantiating the difference in rates, and substantiating that the fuel source would otherwise be disposed of.
When these non-traditional fuel sources are used for heating the building, the proposed case heating source must be the same as the baseline case for systems using the non-traditional fuel source, and the project team must use fossil fuel efficiencies for the Baseline systems, or provide evidence justifying that the baseline efficiencies represent standard practice for a similar, newly constructed project with the same fuel source.
Updated 8/7/17 for rating system applicability.
Campus Applicable
Yes
Internationally Applicable:
Yes
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Requirements
Establish an energy performance target no later than the schematic design phase. The target must be established as kBtu per square foot-year (kWh per square meter-year) of source energy use.
Choose one of the options below.
Option 1. Whole-building energy simulation (1–18 points except Schools and Healthcare, 1–16 points Schools, 1–20 points Healthcare)
Analyze efficiency measures during the design process and account for the results in design decision making. Use energy simulation of efficiency opportunities, past energy simulation analyses for similar buildings, or published data (e.g., Advanced Energy Design Guides) from analyses for similar buildings.
Analyze efficiency measures, focusing on load reduction and HVAC-related strategies (passive measures are acceptable) appropriate for the facility. Project potential energy savings and holistic project cost implications related to all affected systems.
Project teams pursuing the Integrative Process credit must complete the basic energy analysis for that credit before conducting the energy simulation.
Follow the criteria in EA Prerequisite Minimum Energy Performance to demonstrate a percentage improvement in the proposed building performance rating compared with the baseline. Points are awarded according to Table 1.
Table 1. Points for percentage improvement in energy performance
New Construction |
Major Renovation |
Core and Shell |
Points (except Schools, Healthcare) |
Points Healthcare |
Points Schools |
|---|---|---|---|---|---|
6% |
4% |
3% |
1 |
3 |
1 |
8% |
6% |
5% |
2 |
4 |
2 |
10% |
8% |
7% |
3 |
5 |
3 |
12% |
10% |
9% |
4 |
6 |
4 |
14% |
12% |
11% |
5 |
7 |
5 |
16% |
14% |
13% |
6 |
8 |
6 |
18% |
16% |
15% |
7 |
9 |
7 |
20% |
18% |
17% |
8 |
10 |
8 |
22% |
20% |
19% |
9 |
11 |
9 |
24% |
22% |
21% |
10 |
12 |
10 |
26% |
24% |
23% |
11 |
13 |
11 |
29% |
27% |
26% |
12 |
14 |
12 |
32% |
30% |
29% |
13 |
15 |
13 |
35% |
33% |
32% |
14 |
16 |
14 |
38% |
36% |
35% |
15 |
17 |
15 |
42% |
40% |
39% |
16 |
18 |
16 |
46% |
44% |
43% |
17 |
19 |
- |
50% |
48% |
47% |
18 |
20 |
- |
OR
Option 2. Prescriptive compliance: ASHRAE Advanced Energy Design Guide (1–6 points)
To be eligible for Option 2, projects must use Option 2 in EA Prerequisite Minimum Energy Performance.
Implement and document compliance with the applicable recommendations and standards in Chapter 4, Design Strategies and Recommendations by Climate Zone, for the appropriate ASHRAE 50% Advanced Energy Design Guide and climate zone. For projects outside the U.S., consult ASHRAE/ASHRAE/IESNA Standard 90.1–2010, Appendixes B and D, to determine the appropriate climate zone.
ASHRAE 50% Advanced Energy Design Guide for Small to Medium Office Buildings- Building envelope, opaque: roofs, walls, floors, slabs, doors, and continuous air barriers (1 point)
- Building envelope, glazing: vertical fenestration (1 point)
- Interior lighting, including daylighting and interior finishes (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment and controls (1 point)
- Building envelope, opaque: roofs, walls, floors, slabs, doors, and vestibules (1 point)
- Building envelope, glazing: fenestration - all orientations (1 point)
- Interior lighting, excluding lighting power density for sales floor (1 point)
- Additional interior lighting for sales floor (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment choices and controls (1 point)
- Building envelope, opaque: roofs, walls, floors, slabs, and doors (1 point)
- Building envelope, glazing: vertical fenestration (1 point)
- Interior lighting, including daylighting and interior finishes (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment choices, controls, and kitchen equipment (1 point)
- Building envelope, opaque: roofs, walls, floors, slabs, doors, vestibules, and continuous air barriers (1 point)
- Building envelope, glazing: vertical fenestration (1 point)
- Interior lighting, including daylighting (form or nonform driven) and interior finishes (1 point)
- Exterior lighting (1 point)
- Plug loads, including equipment choices, controls, and kitchen equipment (1 point)
Pilot ACPs Available
The following pilot alternative compliance path is available for this credit. See the pilot credit library for more information.
EApc95: Alternative Energy Performance Metric ACP
EApc107 - Energy performance metering path
[view:embed_resource=page_1=7489432]Cost estimates for this credit
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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.
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- Examples of actual submissions from certified LEED projects.
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11/9/2020 – Updated: 12/7/2020
Regional ACP
Description of change:
See the Resource Library for full ACP requirements and documentation.
Campus Applicable
No
Internationally Applicable:
No
7/1/2014 – Updated: 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."
As of 10/1/16, please note the following clarifications for the ACP language in the LEED credit library:
1. Clarify that the metric is cost.
2. Clarify that CanQUEST does not implement many of the ASHRAE 90.1-2010 conditions.
3. Provide exemptions to a few 90.1 mandatory provisions, which are identified as exempt in the ACP calculator.
4. Provide guidance for projects with district energy systems – see condition #11 in ACP language.
"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."
As of 10/1/16, please note the following clarifications for the ACP language in the LEED credit library:
1. Clarify that the metric is cost.
2. Clarify that CanQUEST does not implement many of the ASHRAE 90.1-2010 conditions.
3. Provide exemptions to a few 90.1 mandatory provisions, which are identified as exempt in the ACP calculator.
4. Provide guidance for projects with district energy systems – see condition #11 in ACP language.
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
Projects subject to the v4 2024 update may apply the additional percent savings to each metric (cost, source energy, greenhouse gas emissions)
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”.
***Updated March 1, 2024 to align with changes in the LEED v4 Energy Update
Campus Applicable
No
Internationally Applicable:
No
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 or later?
Ruling:
Project Type(NC = New Construction)
(CS = Core & Shell or unfinished space)
(CI = Interior Fitout)
Additional Percent Savings
Title 24 2016 /
Title 24 2019
Title 24 2022 (or later)
Added to ASHRAE 90.1-2010 (v4)
Added to ASHRAE 90.1-2010 (v4)
Added to ASHRAE 90.1-2016 (v4.1)
TDV Energy (replacing cost & GHG metrics)
TDV Energy (replacing cost metric)
SOURCE Energy (replacing GHG metric)
TDV Energy (replacing cost metric)
SOURCE Energy (replacing GHG metric)
Building Design & Construction (BD+C):
NC - Office
7%
18%
20%
4%
6%
NC - Retail (except restaurant/grocery)
8%
25%
29%
10%
14%
NC - Restaurant / Grocery
0%
18%
20%
4%
6%
NC – School
7%
20%
25%
5%
10%
NC – Healthcare
0%
8%
8%
2%
2%
NC – Hospitality
8%
15%
20%
0%
5%
NC – Warehouse
0%
28%
28%
10%
10%
NC – Multifamily (4+ stories)
8%
16%
20%
4%
8%
Multifamily low-rise (<4 stories)1
8%
16%
20%
4%
8%
Single family residential1
8%
16%
20%
4%
8%
Data Center
0%
10%
10%
0%
0%
All Other (< 50% unregulated TDV)
0%
15%
15%
5%
5%
All Other (≥50% unregulated TDV)
0%
8%
8%
0%
0%
CS-Office
5%
12%
16%
1%
4%
CS-Retail (except restaurant/grocery)
7%
20%
25%
5%
10%
CS-Restaurant/grocery
0%
13%
15%
2%
3%
CS-School
7%
15%
20%
2%
8%
CS-Healthcare
0%
8%
8%
2%
2%
CS-Hospitality
7%
11%
15%
0%
4%
CS-Warehouse
0%
21%
21%
6%
6%
CS-Multifamily
7%
9%
13%
1%
4%
CS-All Other
0%
8%
8%
0%
0%
Interior Design & Construction (ID+C):
CI-Office
6%
Use v4.1
Use v4.1
0%
0%
CI-Retail (except restaurant/grocery)
7%
Use v4.1
Use v4.1
6%
6%
CI-Restaurant/grocery
0%
Use v4.1
Use v4.1
0%
0%
CI-School
7%
Use v4.1
Use v4.1
3%
3%
CI-Healthcare
0%
Use v4.1
Use v4.1
0%
0%
CI-Hospitality
7%
Use v4.1
Use v4.1
0%
0%
CI-Warehouse
0%
Use v4.1
Use v4.1
9%
9%
CI-Multifamily
7%
Use v4.1
Use v4.1
0%
0%
CI-All Other
0%
Use v4.1
Use v4.1
0%
0%
Campus Applicable
No
Internationally Applicable:
No
11/1/2011
LEED Interpretation
Inquiry:
LEED Core and Shell projects are is allowed to show energy savings associated with tenant improvement measures if documented in the lease agreement. Can anchor tenant leases, were executed well before the start of design, also be used? As a result of timing issues, it is not always practical to include specific energy efficiency measures in the lease agreement. Many of our tenants, especially supermarkets and other anchors, are extremely interested in energy efficiency and include these measures in their build-outs. All of these measures are documented in the tenants' construction drawings, which are typically completed simultaneously with the core and shell drawings. We desire to be able to include tenant energy efficiency measures that are documented in the tenants' construction drawings in the LEED for Core and Shell energy model. We would argue that this approach has more certainty and credibility than measures documented in the lease agreement. We would be using measures in permitted, final construction drawings, not requirements that were agreed to during lease negotiations. Please confirm that the LEED for Core and Shell project can include energy efficiency measures documented in the tenant's final construction drawings as part of the LEED for Core-and-Shell energy model.
Ruling:
The energy efficiency measures for tenant spaces documented in the tenant's final construction drawings can be used as part of the LEED Core and Shell energy model if the tenant signs a letter confirming that the final construction documents will be implemented as designed; that any modifications to the final construction documents will be evaluated for their impact on energy efficiency; and that the overall efficiency savings contributed by the tenant improvements will be maintained between the final construction documents and the construction phase. Applicable internationally.
Campus Applicable
No
Internationally Applicable:
Yes
7/8/2017
LEED Interpretation
Inquiry:
ASHRAE 90.1 Appendix G states: “Where a complete lighting system exists, the actual lighting power for each thermal block shall be used in the model.” This allows credit to be claimed in tenant spaces when “a complete lighting system” for these spaces designed and installed within the Core & Shell project scope of work. However, for tenant spaces in a Core & Shell building where tenant sales and lease agreements do not address future changes to the installed lighting, it is unclear what constitutes “a complete lighting system.”
If the documentation demonstrates that tenant space layout is complete, and that a lighting system has been designed and installed such that the tenants most likely to occupy the space can use the space for its intended function without alterations to the lighting system, shall this be considered a “complete lighting system”?
If space layout is incomplete, and a lighting system has been installed that provides adequate illumination for the open space in its current configuration, shall this be considered a “complete lighting system”?
Ruling:
For Projects registered prior to March 1, 2024:
Clarification is requested regarding the definition of a “complete lighting system” for projects where credit is claimed for lighting installed in tenant spaces within the Core & Shell project scope of work.
Core and Shell projects which design, install, and commission complete lighting systems, and demonstrate that the lighting is sufficient for the anticipated tenant uses may use the installed lighting power in the Proposed case energy model for EA Prerequisite: Minimum Energy Performance. All relevant ASHRAE 90.1 Section 9.4 Mandatory Provisions must be designed, installed, and commissioned in the tenant space within Core & Shell project scope of work.
Projects installing complete lighting systems in tenant spaces may not claim more than a 20% reduction in lighting power density for the purposes of prerequisite and credit achievement calculations. Alternatively, to claim more than 20% lighting power savings for a complete lighting system, the greater of the installed lighting power or the tenant required lighting power density may be modeled in the proposed case if a binding owner commitment letter with a sample tenant sales and lease agreement is provided establishing tenant lighting power requirements.
For Projects registered after March 1, 2024:
Clarification is requested regarding the definition of a “complete lighting system” for projects where credit is claimed for lighting installed in tenant spaces within the Core & Shell project scope of work.
Core and Shell projects which design, install, and commission complete lighting systems, and demonstrate that the lighting is sufficient for the anticipated tenant uses may use the installed lighting power in the Proposed case energy model for EA Prerequisite: Minimum Energy Performance. All relevant ASHRAE 90.1 Section 9.4 Mandatory Provisions must be designed, installed, and commissioned in the tenant space within Core & Shell project scope of work.
***Updated March 1, 2024 to remove the limit on savings for complete lighting systems and extend applicability to LEED v4.1.
Campus Applicable
No
Internationally Applicable:
Yes
4/2/2014
LEED Interpretation
Inquiry:
Clarification is requested regarding whether garage demand control ventilation may be modeled for credit. Garage Ventilation is not addressed by ASHRAE 90.1 – 2007, Appendix G, therefore if savings is claimed it must be modeled as an Exceptional Calculation Measure (ECM). Garage demand control ventilation is increasingly becoming standard practice in newly constructed buildings. In order to take credit for this measure as an ECM, it must be demonstrated that the proposed design goes beyond standard practice.
Ruling:
ECMs must be approved by the Rating Authority. As the Rating Authority for LEED projects, the GBCI will accept an ECM for garage demand control ventilation under the following circumstances:
1) Baseline case shall meet the requirements of ASHRAE 90.1-2010, Section 6.4.3.4.5 Enclosed Parking Garage Ventilation. Baseline fan volume shall be based on the minimum required ASHRAE 62.1 parking ventilation rates of 0.75 cfm / square foot. Baseline system fan power shall be calculated at 0.3 watts per CFM.
2) Proposed case shall reflect the actual design. Evidence shall be provided documenting that demand control ventilation strategies are sufficient to automatically detect contaminant levels of concern in parking garages (for example, Carbon Monoxide, Particulates, VOCs, etc. and NO2) and modulate airflow such that contaminant levels are maintained below specified contaminant concentration as identified in ASHRAE 62.1-2010 Addendum d. Evidence shall also be provided that contaminant sensors are placed in space in an appropriate manner for detection of contaminant in question, included in the building commissioning plan upon installation, and then calibrated yearly following installation.
The contaminants of concern that must be monitored may be limited to CO if a narrative is provided justifying how the controls will also help to limit NO2, VOCs and PM2.5 concentrations. The narrative should address how the parking garage minimum exhaust flow rate and/or the minimum fan run time (if applicable) are maintained, and provide clarification that other contaminant levels are expected to remain low based on that design. Note that NO2 would also be expected to be monitored in garages where more than 20% of the vehicles are anticipated to be diesel-fueled.
Note: though it does not need to be addressed specifically in the narrative, the project team must confirm compliance of all ASHRAE 62.1 mandatory measures, including the measure addressing “Buildings with Attached Parking Garages” requiring limitation of vehicular exhaust into adjacent spaces. .
3) If other activities occur in the garage area, the ventilation for these uses shall be in addition to garage vehicle ventilation.
4) Proposed case shall be modeled such that a minimum air flow of 0.05 cfm/square foot is maintained.
5) A narrative shall describe all Baseline and Proposed case assumptions included for this measure, and the calculation methodology used to determine the projected savings. The narrative and energy savings should be reported separately from the other efficiency measures in the LEED Form.
6) No more than a 75% fan energy savings shall be claimed for this measure.
UPDATED on 01/05/18 for rating system version applicability and in Section (2) to clarify that not all contaminants of concern must be continuously monitored.
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
1/10/2020
LEED Interpretation
Inquiry:
Our project is located in California and subject to compliance with Title 24 2019. Title 24 2019 has requirements for lighting power density more stringent than those requirements in ASHRAE 90.1-2010, and unfinished spaces in our project will be subject to the Title 24 2019 requirements.
For LEED credit compliance, our team plans to follow ASHRAE 90.1-2010 modeling. How can we document credit for Title 24 2019 compliant lighting in unfinished spaces?
Ruling:
Building Type*
Unfinished Space Lighting Power Density
Automotive Facility
0.70
Convention Center
0.80
Courthouse
0.80
Dining: Bar Lounge/Leisure
0.75
Dining: Cafeteria/Fast Food
0.70
Dining: Family
0.70
Dormitory
0.61
Exercise Center
0.70
Fire Station
0.71
Gymnasium
0.80
Healthcare Clinic
0.87
Hospital
1.05
Hotel
1.00
Library
0.95
Manufacturing Facility
0.90
Motel
0.88
Motion Picture Theater
0.75
Multifamily
0.60
Museum
1.06
Office
0.72
Parking Garage
0.17
Penitentiary
0.97
Performing Arts Theater
1.10
Police Station
0.96
Post Office
0.8
Religious Building
0.85
Retail: Grocery
1.05
Retail
1.00
School/University
0.72
Sports Arena
0.78
Town Hall
0.85
Transportation
0.60
Warehouse
0.55
Workshop
1.10
Campus Applicable
No
Internationally Applicable:
No
10/1/2015
LEED Interpretation
Inquiry:
Can the baseline model for refrigerated facilities be determined based on the IARW/IACSC Energy Modeling Guideline for Cold Storage and Refrigerated Warehouse Facilities as an exceptional calculation methodology under Appendix G?
Ruling:
Yes, project teams may use the IARW/IACSC Energy Modeling Guideline for Cold Storage and Refrigerated Warehouse Facilities as an exceptional calculation methodology when ASHRAE 90.1-2010 is used for compliance with EA Prerequisite Minimum Energy Performance. This guideline may not be used when an equivalent code is used for compliance unless approved by a project-specific Credit Interpretation Ruling. The following additional requirements apply:
1. Refrigerant type may not be used as an efficiency measure.
2. Table 1.4 must be completed for both the portions of the building complying with the IARW/IACSC Guideline as well as those following the standard ASHRAE 90.1 Appendix G requirements
3. If ASHRAE 62.1-2010 Addendum L is applied using the IARW/IACSC Guideline, it must be applied consistently throughout the project submittal.
4. Projects applying the IARW/IACSC Guideline may apply LEED Interpretation 10237 in order to claim energy savings for refrigeration equipment efficiency as an exceptional calculation methodology.
Internationally applicable as follows: The guidance applies to compliance paths using ASHRAE standards and cannot be applied to projects using an equivalent local code. Project teams wishing to apply this to an equivalent local code must obtain approval through a project-specific credit interpretation ruling.
This ruling supersedes the following LEED Interpretations: LI 5178, LI 2301, and LI 2026.
Campus Applicable
Yes
Internationally Applicable:
Yes
7/1/2014
LEED Interpretation
Inquiry:
There is significant confusion, and seemingly contradictory LEED Interpretations on the required methodology for addressing “purchased” on-site renewable energy, and/or purchased biofuel that is not considered on-site renewable energy within the LEED energy model. For renewable fuels meeting the requirements of Addendum 100001081 (November 1, 2011) or other purchased renewable fuels, how should purchased on-site renewable energy be treated in the LEED energy model? How should purchased bio-fuels (meaning it I not fossil fuel but is used in a similar manner to bio-fuel) be treated in the energy model?
Ruling:
For any on-site renewable fuel source that is purchased (such as qualifying wood pellets, etc.), or for biofuels not qualifying as on-site renewable fuel sources that are purchased, the actual energy costs associated with the purchased energy must be modeled in EA Prerequisite 2: Minimum Energy Performance and EA Credit 1: Optimize Energy Performance, and the renewable fuel source may not be modeled as "free", since it is a purchased energy source.
For non-traditional fuel sources (such as wood pellets) that are unregulated within ASHRAE 90.1, use the actual cost of the fuel, and provide documentation to substantiate the cost for the non-traditional fuel source. The same rates are to be used for the baseline and proposed buildings, with the following exception: If the fuel source is available at a discounted cost because it would otherwise be sent to the landfill or similarly disposed of, the project team may use local rates for the fuel for the baseline case and actual rates for the proposed case, as long as documentation is provided substantiating the difference in rates, and substantiating that the fuel source would otherwise be disposed of.
When these non-traditional fuel sources are used for heating the building, the proposed case heating source must be the same as the baseline case for systems using the non-traditional fuel source, and the project team must use fossil fuel efficiencies for the Baseline systems, or provide evidence justifying that the baseline efficiencies represent standard practice for a similar, newly constructed project with the same fuel source.
Updated 8/7/17 for rating system applicability.
Campus Applicable
Yes
Internationally Applicable:
Yes
LEEDuser expert
Marcus Sheffer
7group / Energy Opportunities
LEED Fellow
