Overall Rating Silver
Overall Score 50.72
Liaison Philip Mansfield
Submission Date Feb. 17, 2017
Executive Letter Download

STARS v2.0

Carleton University
OP-8: Building Energy Consumption

Status Score Responsible Party
Complete 1.94 / 6.00 Philip Mansfield
Sustainability Manager
Facilities Management and Planning
"---" indicates that no data was submitted for this field

Total building energy consumption, all sources (transportation fuels excluded):
Performance Year Baseline Year
Total building energy consumption 588778 MMBtu 576630 MMBtu

Purchased electricity and steam:
Performance Year Baseline Year
Grid-purchased electricity 243200 MMBtu 243045 MMBtu
District steam/hot water 345578 MMBtu 333585 MMBtu

Gross floor area of building space::
Performance Year Baseline Year
Gross floor area 4758519.31 Gross Square Feet 4758519.31 Gross Square Feet

Floor area of energy intensive space, performance year::
Floor Area
Laboratory space 560925.69 Square Feet
Healthcare space 3000 Square Feet
Other energy intensive space

Degree days, performance year (base 65 °F)::
Degree days (see help icon above)
Heating degree days 8161
Cooling degree days 414

Source-site ratios::
Source-Site Ratio (see help icon above)
Grid-purchased electricity 2.05
District steam/hot water 1.20

Start and end dates of the performance year and baseline year (or 3-year periods)::
Start Date End Date
Performance Year Jan. 1, 2015 Dec. 31, 2015
Baseline Year Jan. 1, 2012 Dec. 31, 2012

A brief description of when and why the building energy consumption baseline was adopted:
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A brief description of any building temperature standards employed by the institution:

Annually, FMP does a systems switchover from heating to cooling taking into account two important constraints:

(1) three consecutive days of 25 degrees Celsius outside temperature, and
(2) weather projections for the next 14 days.

The weather projections are very important because if we were to start the cooling systems and subsequently have water freeze in the cooling towers and pipes, this could inflict major damage to the mechanical parts of the systems, delaying cooling for the season while systems are repaired – and we do not want to do that.

The switchover process usually starts mid May. However, we continue to monitor temperatures and weather forecasts and will respond as appropriate.

The changeover to cooling is performed on the basis of priorities established to

(1) provide comfort to students living in University Housing,
(2) maintain required temperatures to protect equipment and research in progress, and
(3) serve the greatest number of individuals and activities.


A brief description of any light emitting diode (LED) lighting employed by the institution:

Currently, a small portion of the lighting across campus has been converted to LED. It is our mission to convert all lighting, eventually, to LED lighting. This is being done through gradual retrofits and upgrades campus-wide.


A brief description of any occupancy and/or vacancy sensors employed by the institution:

Newer buildings constructed on campus have all motion-sensored lighting within the building. A large portion of other buildings on campus have began to be upgraded with daylight sensors around the perimeter of the building; retrofitted buildings are employing the same sensors.


A brief description of any passive solar heating employed by the institution:
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A brief description of any ground-source heat pumps employed by the institution:
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A brief description of any cogeneration technologies employed by the institution:

Cogeneration system to be in-service Jan 1st 2018.


A brief description of any building recommissioning or retrofit program employed by the institution:

As identified in the energy master plan, buildings are upgraded and retrofits are implemented on average of one building per year. Recommissioning efforts are ongoing for building on an as-needed basis


A brief description of any energy metering and management systems employed by the institution:

Carleton University has an extensive metering system which operates on a fiber optic communication network and measures electric, natural gas, water, steam and chilled water consumption for each building across campus.
The Carleton metering system approach is used to measure all the energy used in each of the buildings on campus. The metering server logs all energy values once every hour and measurements of each meter are reviewed monthly, or more frequently as required.


A brief description of the institution's program to replace energy-consuming appliances, equipment and systems with high efficiency alternatives:

As equipment reaches end of life, or if it would have a beneficial payback items are replaced as required.


A brief description of any energy-efficient landscape design initiatives employed by the institution:

Carleton is currently switching to electric vehicles for landscaping and maintenance fleet vehicles.


A brief description of any vending machine sensors, lightless machines, or LED-lit machines employed by the institution:

All vending machines on campus have vending misers and all new vending machines are LED.


A brief description of other energy conservation and efficiency initiatives employed by the institution:
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The website URL where information about the institution’s energy conservation and efficiency initiatives is available:

The information presented here is self-reported. While AASHE staff review portions of all STARS reports and institutions are welcome to seek additional forms of review, the data in STARS reports are not verified by AASHE. If you believe any of this information is erroneous or inconsistent with credit criteria, please review the process for inquiring about the information reported by an institution and complete the Data Inquiry Form.