The Power of Information: Rating and Disclosing Building Energy Performance Alexandra Sullivan US EPA, ENERGY STAR December 2, 2009
Jan 15, 2016
The Power of Information:Rating and Disclosing Building
Energy Performance
Alexandra SullivanUS EPA, ENERGY STAR
December 2, 2009
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Agenda
ENERGY STAR Ratings Objective Characteristics Technical foundation Accessibility
Energy Rating and Disclosure Benefits Market Interest Key to Success
Questions and Discussion
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ENERGY STAR RatingsObjective
Help businesses protect the environment through superior energy efficiency
Motivate organizations to develop a strategic approach to energy management
Convey information about energy performance in a simple metric that can be understood by all levels of the organization
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ENERGY STAR RatingsCharacteristics
Monitor actual as-billed energy data Create a whole building indicator
Capture the interactions of building systems not individual equipment efficiency
Track energy use accounting for weather and operational changes over time
Provide a peer group comparison Compare a building’s energy performance to its
national peer group Track how changes at a building level alter the
building’s standing relative to its peer group
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ENERGY STAR RatingsTechnical foundation
Analyze national survey data Commercial Building Energy Consumption Survey
(CBECS) Develop regression models to predict energy use
for specific space types based on operations Create scoring lookup table
Ratings are based on the distribution of energy performance across commercial buildings
One point on the ENERGY STAR scale represents one percentile of buildings
Buildings that perform in the 75th percentile or better can earn the ENERGY STAR label
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ENERGY STAR RatingsTechnical foundation
The rating does Evaluate as billed energy use relative to building
operations Normalize for operational characteristics (e.g., size,
number of employees, walk-in refrigeration, climate) Depend on a statistically representative sample of the
US commercial building population The rating does not
Attempt to sum the energy use of each piece of equipment
Normalize for technology choices or market conditions (e.g., type of lighting, energy price)
Explain how or why a building operates as it does
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Medical Offices Office Buildings
Hospitals
Warehouses
Dormitories
Supermarkets
Courthouses
K-12 Schools
Bank/FinancialInstitutions
Hotels
Wastewater Treatment Plants
Retail Stores
Eligible Space Types
Houses of Worship
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ENERGY STAR RatingsAccessibility: Portfolio Manager
Free on-line tracking and benchmarking tool Available for any building Track energy use
Site EUI Source EUI Weather normalized source EUI National average comparisons
Energy performance ratings (for selected spaces) Track energy costs Track carbon emissions using eGRID Track water consumption Data sharing functions and automated data import Apply for ENERGY STAR recognition
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Statement of Energy Performance
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Certificate for Display
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Energy Rating and DisclosureBenefits
Identify inefficiency There is a great potential for cost-effective energy efficiency across the
national building stock Better information on how much energy buildings use and how buildings
compare to one another is critical to fulfilling this potential Provide a whole building assessment
Energy assessment at the building level reveals information about how technologies interact and influence performance
Improve energy performance Simple metrics are powerful motivators for change, spurring efficiency
improvements within public and private organizations Metrics that can be easily quantified can be tracked regularly and
communicated within and among organizations Maintain savings
Simple quantifiable measures can be tracked year-to-year to ensure persistence of savings
Almost 40% of ENERGY STAR labels each year are earning a label for the second or third time
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Energy Rating and DisclosureGrowing Interest
Organizations and businesses Internal energy management tracking Internal disclosure of scores (store managers,
regional and upper management) Voluntary disclosure of scores on web (school
districts, governments) Real Estate information services
CoStar Hotel services (Travelocity, AAA, Orbitz)
Mandatory Disclosure Legislation Time of Sale (California) Annual public disclosure (D.C. New York City)
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Learn about governments leveraging ENERGY STAR in legislation and voluntary campaigns. www.energystar.gov/government
Energy Rating and DisclosureGrowing Interest
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Energy Rating and DisclosureKeys to Success
Measured energy data The use of actual measured building data is critical to assessing
performance Measured data will account for interactions among building systems,
building maintenance, tenant activities, etc Data verification
Data must be accurate to provide a fair comparison among buildings Decision makers need to know that information is reviewed and
complete Accessibility
System and metrics should be easy to use and understand Costs should be kept to a minimum to encourage broad applicability
Consistency Metrics should be used from design through construction and operation Standardized metrics provide a reliable platform for organizations
Questions and Discussion