Overall Rating Gold - expired
Overall Score 65.42
Liaison Matthew Muchna
Submission Date March 3, 2017
Executive Letter Download

STARS v2.1

Northern Arizona University
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 3.69 / 6.00 Ellen Vaughan
Office of Sustainability
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 226,576 MMBtu 150,629.55 MMBtu
Electricity from on-site renewables 791.97 MMBtu 0 MMBtu
District steam/hot water (sourced from offsite) 377,802 MMBtu 372,524 MMBtu
Energy from all other sources (e.g., natural gas, fuel oil, propane/LPG, district chilled water, coal/coke, biomass) 0 MMBtu 0 MMBtu
Total 605,169.97 MMBtu 523,153.55 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year July 1, 2015 June 1, 2016
Baseline Year June 30, 1990 July 1, 1991

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):

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

Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 6,504,837 Gross Square Feet 4,303,800 Gross Square Feet

Source-site ratio for grid-purchased electricity:

Total building energy consumption per unit of floor area:
Performance Year Baseline Year
Site energy 0.09 MMBtu / GSF 0.12 MMBtu / GSF
Source energy 0.19 MMBtu / GSF 0.22 MMBtu / GSF

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

Degree days, performance year (base 65 °F / 18 °C):
Degree days (see help icon above)
Heating degree days 7,106 Degree-Days (°F)
Cooling degree days 537 Degree-Days (°F)

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

EUI-adjusted floor area, performance year:
6,915,042 Gross Square Feet

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

Documentation (e.g. spreadsheet or utility records) to support the performance year energy consumption figures reported above:

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):

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

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

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

LEDs are now the standard for interior and exterior lighting along with lighting control systems. The control strategies vary based on the type of building and occupant requests.

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

Some buildings use passive solar heating for water or air.

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

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):

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

The website URL where information about the programs or initiatives is available:
Additional documentation to support 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 and complete the Data Inquiry Form.