Overall Rating Gold - expired
Overall Score 65.60
Liaison Dayna Cook
Submission Date May 1, 2014
Executive Letter Download

STARS v2.0

Northern Arizona University
OP-8: Building Energy Consumption

Status Score Responsible Party
Complete 2.75 / 6.00 Ellen Vaughan
Office of Sustainability
"---" 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 607,779.81 MMBtu 523,153.55 MMBtu

Purchased electricity and steam:
Performance Year Baseline Year
Grid-purchased electricity 220,931.31 MMBtu 150,629.55 MMBtu
District steam/hot water 386,848.50 MMBtu 372,524 MMBtu

Gross floor area of building space::
Performance Year Baseline Year
Gross floor area 6,460,750 Gross square feet 4,303,800 Gross square feet

Floor area of energy intensive space, performance year::
Floor Area
Laboratory space 90,301 Square feet
Healthcare space 20,706 Square feet
Other energy intensive space

Degree days, performance year (base 65 °F)::
Degree days (see help icon above)
Heating degree days 7,052
Cooling degree days 179

Source-site ratios::
Source-Site Ratio (see help icon above)
Grid-purchased electricity 3.34
District steam/hot water 1.05

Start and end dates of the performance year and baseline year (or 3-year periods)::
Start Date End Date
Performance Year June 30, 2012 July 1, 2013
Baseline Year June 30, 1990 July 1, 1991

A brief description of when and why the building energy consumption baseline was adopted:

1991 was the first year we began inventorying and have the highest of confidence in data collection.

A brief description of any building temperature standards employed by the institution:

Our recent NORESCO energy conservation measures project sets temperature standards of 69-76 for the majority of NAU buildings.

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

LEDs are utilized in nearly all of the lighting in our new San Francisco parking garage (483,096 sqft.)

NAU uses LED lights in small amounts on other projects (like Chemical Storage and Ceramic Clay Mixing buildings).

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

NAU has been installing motion sensors (used to turn on the lights when someone enters the room, and off when there is no movement for 10 minutes) in most of our new construction for at least three years. Newest construction (2013) usually has dual type sensors (heat and motion) for classrooms and offices.

A brief description of any passive solar heating employed by the institution:

All new construction on campus is required to be LEED silver certified. Therefore, there are many buildings, such as the Applied Research and Development that utilize passive solar heating.

A brief description of any ground-source heat pumps employed by the institution:

A brief description of any cogeneration technologies employed by the institution:

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

As part of Northern Arizona University's efforts to reduce costs and emissions associated with energy waste, Facility Services contracted NORESCO to provide and implement energy conservation measures (ECMs). This 15-year Energy Savings Performance Contract pays for the upgrades with cost avoidance generated by the ECMs, saving approximately $1,500,000 annually.

Some ECMs implemented are:

Lighting Systems:
Interior Lighting

Plumbing Systems:
Domestic Plumbing
Ice Maker Upgrades
Pre-Rinse Sprayers
Garbage Disposal Restrictors

Building Controls and Submetering
Implement energy savings strategies
Replace Pneumatic or Stand-Alone controls
Control Heating Equipment
Replace Existing Controls
Utility Submeters

Exhaust Snorkles and Split System
AHU/VAV Conversion
CRAC Units
40-ton Chiller
15 Air Handling Units
Heat Recovery Coils in Exhaust Ducts
Back-up Chiller

Attic Insulation
Steam Distribution Tunnel
Back-up Chiller

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

The Allerton Envision System is used for at least 33 buildings on campus and allows for the metering and tracking of energy use in these buildings.

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

See the NORESCO project listed above.

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

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

In all Residence Halls on campus and in some of the academic/administrative buildings, we use the vending miser system to save energy when items are not being purchased from machines.

A brief description of other energy conservation and efficiency initiatives employed by the institution:

The Green NAU Energy Initiative (GNEI) employees two full-time staff to work on educational outreach to help students, faculty and staff conserve resources.

The website URL where information about the institution’s energy conservation and efficiency initiatives is available:
Data source(s) and notes about the submission:

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 or simply email your inquiry to stars@aashe.org.