Overall Rating Gold
Overall Score 82.07
Liaison Corey Hawkey
Submission Date March 1, 2018
Executive Letter Download

STARS v2.1

Arizona State University
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 5.63 / 6.00 Corey Hawkey
Assistant Director
University Sustainability Practices
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Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 736915 MMBtu 954535.07 MMBtu
Electricity from on-site renewables 128870 MMBtu 0 MMBtu
District steam/hot water (sourced from offsite) 0 MMBtu 0 MMBtu
Energy from all other sources (e.g., natural gas, fuel oil, propane/LPG, district chilled water, coal/coke, biomass) 779035 MMBtu 694741 MMBtu
Total 1644820 MMBtu 1649276.07 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year July 1, 2016 June 30, 2017
Baseline Year July 1, 2006 June 30, 2007

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):

To coincide with Arizona State University's first formal Greenhouse Gas inventory.


Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 23179635 Gross Square Feet 14033632 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 0.07 MMBtu / GSF 0.12 MMBtu / GSF
Source energy 0.14 MMBtu / GSF 0.26 MMBtu / GSF

Percentage reduction in total building energy consumption (source energy) per unit of floor area from baseline:
47.17

Degree days, performance year (base 65 °F / 18 °C):
Degree days (see help icon above)
Heating degree days 829 Degree-Days (°F)
Cooling degree days 5071 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 1643330 Square Feet
Healthcare space 32721 Square Feet
Other energy intensive space

EUI-adjusted floor area, performance year:
26572310 Gross Square Feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
10.49 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):

University Sustainability Practices has two energy conservation programs that are promoted within the residential life communities; Carbon Cleanse and Kill Vampire Energy. Carbon Cleanse seeks to enlighten students about their energy use through the discussion of measuring one's carbon footprint. This information is then used to encourage students to ”cleanse” energy usage, such as choosing a plant based diet once a week, shopping local or switching light bulbs to LED. The Kill Vampire Energy program is focused on an awareness that some items are “energy suckers” – they draw energy even when switched off, such as gaming systems, microwaves and printers. We suggest that students unplug when they leave for an extended period of time or unplug once phones and laptops are charged to help reduce carbon emissions.


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

Approximately 75% of Arizona State University's buildings at the Tempe campus can be scheduled through the building automation system. This is a Johnson Controls Metasys system that is used to turn air handlers and pumps, etc. on and off according to the scheduling needs for a particular building, or zone within a building. Building occupancy needs are determined by academic, research, and administrative staff, then equipment schedules are optimized to prevent unnecessary run-time.

The Polytechnic campus employs a system called Direct Digital Control (DDC). It’s an Alerton system that controls and maintains temperature ranges and generates reports on use of energy, remote monitoring and alarms.

West campus buildings have been upgraded to Computerized Direct Digital Controls. Buildings are operated based on the needs of the customer reducing building systems operating hours by over 50%.

ASU's temperature guidelines establish design setpoints of 70F heating and 78 cooling with a lower/upper range of 68F and 80F respectively for typical program spaces. This guideline is dependent on the requirements of the space program, i.e. research or mission critical spaces, etc.

Non-critical program spaces are designed around ASHRAE design conditions at 99% for heating and 2% for cooling. This results in less energy consumption to condition outdoor air.

Other typical strategies include, but are not limited to, outdoor air economizer control, occupancy/vacancy sensors, demand-control ventilation and energy recovery.


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

Arizona State University continues its rollout of LED technologies in both new construction projects as well as tenant improvements. In many cases, ASU leverages its Sustainability Initiatives Revolving Fund (SIRF) as a financial resource to implement these upgrades due to the quick return on investment of these projects. To date, ASU has updated over 10,000 fixtures with LEDs and has saved over 1,500,000 kWh annually.


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

None.


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

An 8.8 MW natural gas-fired combined heat & power plant provides nearly 45,000 MWh of electricity to ASU's research community at the Tempe Campus, and is able to provide 6,000 tons of chilled water and 80,000 lbs of steam to the whole campus.


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):

ASU currently recommissions 30 buildings from the Energy Savings Performance Contract – Phase II on a rotational basis every 4 years. This portfolio equates to 2,929,643 square feet of space, approximately 13% of ASUs gross square footage.

ASU is currently evaluating a third Energy Savings Performance Contract - Phase III which will provide Energy Conservation Measures in approximately 34 buildings, equating to 3,343,302 square feet of space, approximately 14% of ASUs gross square footage.

ASU has setup an Energy Innovations Team that is actively pursuing and implementation other energy savings opportunities at all campuses, such as LED retrofits, central plant optimization, motor replacements, control strategies, etc.


The website URL where information about the programs or initiatives is available:
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Additional documentation to support the submission:
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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.