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Energy Usage Intensity (EUI)

Energy Usage Intensity (EUI), is a unit of measurement that describes a building’s energy use. EUI represents the energy consumed by a building relative to its size and is therefore a key metric used to compare assets within a portfolio consisting of similar property types. This value has been “normalized,” which is to say that it has first been has adjusted to reconcile the number of days in a calendar month since typical billing cycles generally occur over two months (i.e. January 15th to February 12th). This value is then adjusted to correspond to 30 year temperature averages based on Heating Degree Days and Cooling Degree Days. In doing so, a property located in an area that experienced a recent heat wave can be compared to a similar property located in a area that did not experience such a variation. This is analogous to placing all properties on a “level playing field” to which they can be compared.

How is EUI Calculated?
A building’s EUI is calculated by taking the total energy consumed in one year (measured in kBtu) and dividing it by the total floorspace of the building. For example, if a 50,000-square-foot office building consumed 7,500,000 kBtu of energy last year, its EUI would be 150. A similarly sized office building that consumed 9,000,000 kBtu of energy last year would have a higher EUI (180) to reflect its higher energy use. Generally, a low EUI signifies good energy performance.

Energy Cost Intensity (ECI)

Is the Energy Usage Intensity (EUI) converted to monetary units by multiplying the 12 month energy cost average per unit of measure (i.e. kwh, therms, etc.). Unlike EUI, this value does not allow comparison among properties on an energy performance basis, but rather overall operational cost.

EUI Filters – High

Property EUI’s that fall in the bottom 25th percentile of the dashboard portfolio. Properties in this category are among the poorest overall performers.

EUI Filters – Medium

Property EUI’s that fall between the 25th and 75th percentile of the dashboard portfolio. Properties in this category are just above or below “average” portfolio performers.

EUI Filters – Low

Property EUI’s that fall in the top 25th percentile of the dashboard portfolio. Properties in this category are among the best overall performers.

Portfolio Rank

Based on Energy Usage Intensity, this provides overall standing of portfolio property performance with the 1st place ranking being the best among all dashboard properties.

Electricity (Monthly)

The amount of electricity expressed in units of kilowatt-hours (kwh) consumed in the last month of billing data. A green down arrow indicates decreased electricity consumption and therefore an increase in performance relative to the prior rolling year consumption calculation. Conversely, a red up arrow indicates increased consumption and therefore a decrease in performance. Like the Energy Usage Intensity, these values have been normalized for both calendar months and Degree Days.

Gas (Monthly)

The amount of natural gas expressed in units of therms consumed in the last month of billing data. A green down arrow indicates decreased natural gas consumption and therefore an increase in performance relative to the prior rolling year consumption calculation. Conversely, a red up arrow indicates increased consumption and therefore a decrease in performance. Like the Energy Usage Intensity, these values have been normalized for both calendar months and Degree Days.

Water (Monthly)

The amount of water expressed in units of gallons (gal) consumed in the last month of billing data. Typically no direct correlation exists between water consumption and outdoor temperatures. Therefore, these values are not normalized. A green down arrow indicates decreased water consumption but does not necessarily indicate an increase in performance. Conversely, a red up arrow indicates increased consumption but does not necessarily indicate a decrease in performance. This is due to a number of factors such as City mandated emergency water rationing, etc.

Electricity (Annual)

The amount of electricity expressed in units of kilowatt-hours (kwh) consumed in the most recent 12 months of billing data. A green down arrow indicates decreased electricity consumption and therefore an increase in performance relative to the prior rolling year consumption calculation. Conversely, a red up arrow indicates increased consumption and therefore a decrease in performance. Unlike the Energy Usage Intensity, these values have been 'calendarized' only and have not been adjusted for weather conditions (ie, this is raw utility bill data adjusted to represent a full calendar month).

Gas (Annual)

The amount of natural gas expressed in units of therms consumed in the most recent 12 months of billing data. A green down arrow indicates decreased natural gas consumption and therefore an increase in performance relative to the prior rolling year consumption calculation. Conversely, a red up arrow indicates increased consumption and therefore a decrease in performance. Unlike the Energy Usage Intensity, these values have been 'calendarized' only and have not been adjusted for weather conditions (ie, this is raw utility bill data adjusted to represent a full calendar month).

Water (Annual)

The amount of water expressed in units of gallons (gal) consumed in the most recent 12 months of billing data. Typically no direct correlation exists between water consumption and outdoor temperatures. Therefore, these values are not normalized. A green down arrow indicates decreased water consumption but does not necessarily indicate an increase in performance. Conversely, a red up arrow indicates increased consumption but does not necessarily indicate a decrease in performance. This is due to a number of factors such as City mandated emergency water rationing, etc.

CDD Normal

Average monthly cooling degree days between 1971-2000. Source: http://cdo.ncdc.noaa.gov/cgi-bin/climatenormals/climatenormals.pl?direct...
The amount of deviation in the average daily temperature from 65 degrees. Average temperatures greater than 65 degrees yield cooling degree days where average daily temperatures less than 65 degrees yield heating degree days.

HDD Normal

Average monthly heating degree days between 1971-2000. http://cdo.ncdc.noaa.gov/cgi-bin/climatenormals/climatenormals.pl?direct...
The amount of deviation in the average daily temperature from 65 degrees. Average temperatures greater than 65 degrees yield cooling degree days where average daily temperatures less than 65 degrees yield heating degree days.

CDD Actual

The number of days/month above the base temperature (65 degrees) multiplied by the difference between the average daily temperature and the base temperature for the current reporting month.

HDD Actual

The number of days/month below the base temperature (65 degrees) multiplied by the difference between the average daily temperature and the base temperature for the current reporting month.

The amount of deviation in the average daily temperature from 65 degrees. Average temperatures greater than 65 degrees yield cooling degree days where average daily temperatures less than 65 degrees yield heating degree days.

Normalized Direct CO2 (Tons) Emissions

The total greenhouse gas emissions for purchased fuels that contribute to emissions: Electricity, Natural Gas, District Steam, District Hot Water and District Chilled Water. CO2 emissions are summed across all active meters and reported in tons of Carbon Dioxide.

Cost Avoidance

Calculates the savings attributable to energy management by comparing current bills with a normalized baseline year. Complies with the IPMVP, Section C (www.EVO-World.org) "whole building method" of energy savings measurement & verification.