Overall Rating Silver
Overall Score 51.92
Liaison Ilda Hershey
Submission Date May 15, 2018
Executive Letter Download

STARS v2.1

Oklahoma State University
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 4.31 / 6.00 Ilda Hershey
Sustainability Coordinator
OSU Physical Plant
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 352,145 MMBtu 456,405.20 MMBtu
Electricity from on-site renewables 0 MMBtu 0 MMBtu
District steam/hot water (sourced from offsite) 322,226 MMBtu 383,398.50 MMBtu
Energy from all other sources (e.g., natural gas, fuel oil, propane/LPG, district chilled water, coal/coke, biomass) 591,134 MMBtu 638,198 MMBtu
Total 1,265,505 MMBtu 1,478,001.70 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year Jan. 1, 2017 Dec. 31, 2017
Baseline Year Jan. 1, 2006 Dec. 31, 2006

A brief description of when and why the building energy consumption baseline was adopted (e.g. in sustainability plans and policies or in the context of other reporting obligations):
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Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 12,646,815 Gross Square Feet 10,701,263 Gross Square Feet

Source-site ratio for grid-purchased electricity:
3.14

Total building energy consumption per unit of floor area:
Performance Year Baseline Year
Site energy 0.10 MMBtu / GSF 0.14 MMBtu / GSF
Source energy 0.16 MMBtu / GSF 0.24 MMBtu / GSF

Percentage reduction in total building energy consumption (source energy) per unit of floor area from baseline:
30.35

Degree days, performance year (base 65 °F / 18 °C):
Degree days (see help icon above)
Heating degree days 3,060 Degree-Days (°F)
Cooling degree days 2,046 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 961,115 Square Feet
Healthcare space 92,690 Square Feet
Other energy intensive space

EUI-adjusted floor area, performance year:
14,971,422 Gross Square Feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
16.55 Btu / GSF / Degree-Day (°F)

Documentation (e.g. spreadsheet or utility records) to support the performance year energy consumption figures reported above:
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A brief description of the institution's initiatives to shift individual attitudes and practices in regard to energy efficiency (e.g. outreach and education efforts):

The OSU Energy Management Program employs behavior-based energy management techniques to engage all staff, faculty and students in the University's goal to continue to lower its energy usage. Outreach and education efforts include presentations, tours, training, office reminder notes, contests, quizzes, email blasts, social media updates, tabling, and special events


A brief description of energy use standards and controls employed by the institution (e.g. building temperature standards, occupancy and vacancy sensors):

We use a building automation system to schedule HVAC run times in most general University buildings. The University has included both occupied and unoccupied temperature ranges for building temperatures within our energy management guidelines. In many labs, occupancy sensors are used to control HVAC and air flow rates so that life safety needs are met while maximizing energy efficiency.


A brief description of Light Emitting Diode (LED) lighting and other energy-efficient lighting strategies employed by the institution:

Lighting is being replaced where possible with LED fixtures. The Lutron Vive control system has also been implemented in four buildings with expectations to introduce in various facilities across campus. Outdoor LED lighting has been installed in most outdoor fixtures.


A brief description of passive solar heating, geothermal systems, and related strategies employed by the institution:

Passive solar heating is employed on campus in these buildings: NRC atrium, ATRC atrium, the Colvin Annex, Architecture building south hallways, and the Student Union atrium.


A brief description of co-generation employed by the institution, e.g. combined heat and power (CHP):

Steam extraction turbines at OSU Central Plant produce heated steam and chillers provide air-conditioning.


A brief description of the institution's initiatives to replace energy-consuming appliances, equipment and systems with high efficiency alternatives (e.g. building re-commissioning or retrofit programs):
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The website URL where information about the programs or initiatives is available:
Additional documentation to support the submission:
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Casey Keyser & Tammy Johnson, Energy Managers; James Hollan, Geospatial

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.