ENERGY STAR®
PortfolioManager™
DataTrends
Energy Use in Hotels
Hotels
Using Portfolio Manager

8,426 Properties
1.7 Billion ft2
Average
ENERGY STAR Score
The U,S, Environmental Protection Agency's (EPA) ENERGY STAR Portfolio Manager is
changing the way organizations track and manage energy, Because of this widespread
market adoption, EPA has prepared the DataTrends series to examine benchmarking and
trends in energy and water consumption in Portfolio Manager. To learn more, visit
www.energystar.gov/DataT rends
Benchmarking by State
Number of Hotel Buildings
What is a typical operating profile?
Energy use intensity (EUI) ranges from less than 100 to more
than 800 kBtu/ft2 across all hotel buildings, with those at the 95th
percentile using almost 4 times the energy of those at the 5th
percentile. The distribution has a negative skew, which means
the most energy intensive buildings are much further away from
the median than the most efficient, Buildings may use more or
less energy for many reasons, including variable equipment
efficiency and energy management practices, as well as
variations in climate and business activities.
to
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1,200 n
1,000 -
1 800 -
00
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What characteristics affect
energy use?
How does EPA's ENERGY STAR score
vary with energy use?
Business activity and climate are often correlated with energy
consumption. For example, hotels that have more workers per
square foot, more commercial refrigeration units per square foot,
and/or experience more cooling degree days (CDD) use more
energy, on average. The orange trend line in the graphs below is
the steepest for workers, meaning that workers has a stronger
effect on energy than CDD or refrigeration units. While these
trends hold true on average, two buildings with the same number
of workers could have very different energy, as shown by the
range in the blue dots. Similar trends can be seen for other
indicators of business activity, such as number of rooms.
Workers
-r*i .
VV, / r
0.4	0.8	1.2
Workers per 1000 ft2
Refrigeration Units
800
700
600
500
400
300
200
100
-C. : .. • * '

0.00 0.05 0.10 0.15 0.20 0.25 0.30
Commercial Refrigeration/Freezer Units per 1000 ft2
Cooling Degree Days
3
L1J
800

700

600
\
500
* . \ .
400

300

200

100

0

/."si'.'! '¦ * y' r . " * • *** * **• • •
*** *	- * li't f	*• •			L	!	!
1000	2000	3000	4000	5000
Cooling Degree Days
EPA's ENERGY STAR score normalizes for the effects of
operation. While buildings with lower EUI generally earn higher
scores on the 1-100 scale, an individual building's result
depends on its business activities. For any given EUI, a range of
scores is possible.
ENERGY STAR Score Range
II
o
o
0

>-
0
a:
LU
Forany value of EUI,
a range of 1-100
ENERGY STAR scores
can be expected
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Range represents
10th - 90th percentile
values for score
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Source EUI (kBtu/ft2)
Let's look at two hotel buildings. Hotel A and Hotel B. They have
the same EUI of 183 kBtu per square foot, and are identical
except that Hotel B has more workers per square foot and more
commercial refrigeration units per square foot. Because Hotel B
has more intensive activities, it is expected to have a higher EUI
than Hotel A, based on ENERGY STAR scoring models. Since
Hotel B is expected to use more energy, but actually uses the
same energy, it earns a higher score.
Workers: 20
Workers:
Refrigeration
Units: 3
Refrigeration
Units: 8
Expected EUI:
221
Expected EUI
242
Note: Number and floor area of buildings benchmarked
includes cumulative data through 2011. Analysis of energy
use and business activity includes buildings benchmarked
between 2006 and 2012. 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
v>EPA
United States
Environmental Protection
Agency
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