To reduce the environmental and economic harms of excessive energy use by achieving a minimum level of energy efficiency for the building and its systems.
Comply with ANSI/ASHRAE/IESNA Standard 90.1–2016, with errata or a USGBC-approved equivalent standard.
ASHRAE 90.1-2016 Compliance pathways in Section 22.214.171.124 include compliance with all mandatory provisions, and compliance with one of the following:
- Prescriptive provisions of Sections 5 through 10
- Section 11 Energy Cost Budget Method
- Normative Appendix G Performance Rating Method. When using Appendix G, the Performance Cost Index (PCI) shall be less than or equal to the Performance Cost Index Target (PCIt) in accordance with the methodology provided in Section 126.96.36.199. Document the PCI, PCIt, and percentage improvement using metrics of cost or greenhouse gas (GHG) emissions.
For projects using Normative Appendix G Performance Rating Method:
- Greenhouse gas emissions: The total greenhouse gas emissions, in terms of carbon dioxide equivalents, shall be calculated for the baseline building performance rating and for the proposed building performance rating, and the percentage improvement shall be determined using carbon dioxide equivalent emissions.
US and Canada:
- use U.S. Environmental Protection Agency’s (EPA) regional grid mix coefficients to calculate GHG emissions by energy source; or
- use hourly emissions profiles from U.S. Environmental Protection Agency’s (EPA) AVoided Emissions and geneRation Tool (AVERT)
- use national grid mix coefficients from the International Energy Agency CO2 Emissions from Fuel Combustion 2017 report to calculate GHG emissions by energy source
- ISO 52000-1:2017: Greenhouse gas emission factors for each building energy source shall be determined consistently with ISO Standard 52000-1:2017 and published for the country or region where the project is located
- Exception to Mandatory Measures requirements: For ASHRAE 90.1-2016 mandatory controls provisions that are quantified in the Appendix G Performance Rating Method, (e.g. lighting occupancy sensor controls, lighting daylighting controls, automated receptacle controls, etc.), projects may model the Proposed Building Performance control parameters identically to the Baseline Building Performance control parameters in lieu of compliance with the mandatory provisions.
- Exceptional Calculations modeled in accordance with Section G2.5 may be modeled to document minimum prerequisite compliance.
- Only on-site or on-campus renewable energy that meets ASHRAE Standard 90.1-2016 Section G 2.4.1 requirements for on-site renewable energy may be used to meet minimum ASHRAE Standard 90.1-2016 performance requirements.
© Copyright U.S. Green Building Council, Inc. All rights reserved.