Annual Energy Use
Energy Use Intensity
- Site/Source Energy
The energy use data entered should
correspond to the total energy consumed during a recent 12-month period.
All EUIs in the database were calculated from
data, and normalized to represent a 365-day period.
Currently the database contains only
gas and electric data though some of the buildings in the database may
use other fuels, and are separated accordingly. See the results
page for explanation of what buildings are included in each graph.
By definition, the 'buildings' contained
in this database may or may not represent entire buildings, but rather,
a business, or premise. Hence it is useful to compare by floor area.
The building type, or principal
building activity, is the only required user input in Cal-Arch. The
default value is Office/Professional. If you are just browsing and
do not have data to enter, you can select a building type and then skip
to the end to see what the distribution of
like. If your building falls into more than one category, select
the one that takes up the most floor space. Future versions may allow
you to select multiple building types.
Note that Education: K-12
is wholly included within the Education category.
The California Energy Commission
recognizes 16 different climate zones in California. Because the sample
sizes in some zones are small, particularly when multiple filter criteria
are applied, the climate zones have been grouped into 4 climate zones:
North Coast, South Coast, Central Valley, and Desert/Mountain. Click on
the images below for enlarged view.
If you enter a zip code, only buildings within the same climate zone will
be displayed in your results.
Currently Cal-Arch contains data
only from the PG&E and SCE electric service territories. If you
enter a zip code and few or no buildings are returned, try again without
a zip code, and/or uncheck the floor area filtering checkbox.
Use Intensity (EUI)
This is a measure of total energy
use normalized for floor area. This is used to compare the energy
use of different buildings, and is the unit for the x-axis on the histogram
displayed in your results.
energy use is measured in kBtu (1000 British thermal units) per square
foot, per year, to standardize units between fuels. Electricity use
is often expressed as annual kWh per sqft per year.
By default, if both floor area and
energy use are entered, an EUI
will be calculated for your building. Depending on the energy
use data entered, separate EUIs will be
for electric, gas, and whole-building energy use.
If you check the floor area checkbox,
floor area will be used as a filter variable. That is, only buildings
with the 1/2 to 2 times the floor area entered will be included in your
Energy use can be
as either site or source energy. Typically site energy, the energy
delivered to your building, is reported and
billed, and thus it is assumed you are entering your data as site data.
In evaluating energy efficiency and environmental impacts of energy
consumptions you may be interested in examining Source energy, the energy
produced and transmitted from the power plant. The site-to-source
conversion factor used in Cal-Arch for electricity is 2.7 (*); Site and
Source gas use are nearly the same. The differences are primarily due to
* US Energy Information Administration, CA State Energy