ENERGY STAR®
PortfolioManager™
DataTrends
Benchmarking and Energy Savings
Do buildings that consistently benchmark energy performance
save energy? The answer is yes, based on the large number of
buildings using the U.S. Environmental Protection Agency's
(EPA's) ENERGY STAR Portfolio Manager to track and manage
energy use. Over 35,000 buildings entered complete energy
data in Portfolio Manager and received ENERGY STAR scores
for 2008 through 2011, which represents three years of change
from a 2008 baseline. These buildings realized savings every
year, as measured by average weather-normalized energy use
intensity and the ENERGY STAR score, which accounts for
business activity. Their average annual savings is 2.4%, with a
total savings of 7.0% and score increase of 6 points over the
period of analysis.
Which buildings experienced the
greatest savings?
Buildings that start with lower ENERGY STAR scores and higher
energy use achieve the greatest savings. In fact, buildings
starting with below average energy efficiency in 2008 (i.e., score
under 50) saved twice as much energy as those starting above
average.
Savings Vary with ENERGY STAR Score
Energy Savings in Portfolio Manager
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Savings
2008 2009
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2008 2009
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2011
7% average energy savings and
6 point ENERGY STAR score increase
among Portfolio Manager buildings
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How do savings levels vary among
buildings?
Over 70% of the buildings (25,926) reduced their energy
consumption, as shown in blue below. Close to 90% of these
experienced average annual reductions in the range of 0 to 10%.
A smaller number of buildings experienced average annual
reductions greater than 10%, which may be expected with large
scale energy efficiency investments. This suggests that slow and
steady improvements over time are typical of buildings that
consistently track and benchmark energy consumption.
Average Annual Energy Change (2008-2011)
in Weather Normalized Source EUI
r
i More than 10%
Reduction
Oto 10%
Reduction
Oto 10%
Increase
More than 10%
Increase
Energy savings were experienced by all building types. Among
those with above average savings are Retail, Office, and K-12
School, the sectors with the most buildings benchmarking in
Portfolio Manager. These buildings represent over 60% of the
buildings benchmarking consistently from 2008-2011.
Savings by Building Type
12%
£ 10%
Average Percent Savings,
All Buildings
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Possible Savings:
25% by 2020
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What is the financial value of
benchmarking?
The financial value of benchmarking can be expressed in terms
that are meaningful to each building sector. A savings of 2.4%
for three consecutive years is equivalent to the following:
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For a 500,000 square foot office building:
Cumulative energy cost savings of $120,000
Increase in asset value of over $1 million
For a medium box retailer with 500 stores:
Cumulative energy cost savings of $2.5 million
Increase in sales of 0.89%
For a full service hotel chain with 100 properties:
Cumulative energy cost savings of $4.1 million
Increase in revenue per available room of $1.41
For an 800,000 square foot school district:
Cumulative energy cost savings of $140,000
Salary of 1.2 full time teachers each year
Note: This analysis represents buildings benchmarking consistently from 2008 through 2011. The data is self reported and has been
filtered to exclude outliers, incomplete records, and test facilities. Portfolio Manager is not a randomly selected sample and is not the
basis of the ENERGY STAR score. To learn more, visit: www. energystar. gov/Data Trends.
October 2012
United States
Environmental Protection
^'^1	Agency
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