Overall Rating Silver - expired
Overall Score 59.34
Liaison Elizabeth MacKenzie
Submission Date July 24, 2018
Executive Letter Download

STARS v2.1

University of Iowa
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 3.08 / 6.00 George Paterson
Energy Control Center Manager
Facilities Management
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 615,106 MMBtu 578,829.24 MMBtu
Electricity from on-site renewables 355 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) 1,577,675 MMBtu 1,479,586.05 MMBtu
Total 2,193,136 MMBtu 2,058,415.29 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year June 1, 2016 May 31, 2017
Baseline Year June 1, 2004 May 31, 2005

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):
The University of Iowa joined the Chicago Climate Exchange (since disbanded) in the early 2000's and has adopted the year 2005 as a baseline year for a number of measures of sustainability.

Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 13,620,153 Gross square feet 11,200,219 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 0.16 MMBtu per square foot 0.18 MMBtu per square foot
Source energy 0.26 MMBtu per square foot 0.29 MMBtu per square foot

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 5,336 Degree-Days (°F)
Cooling degree days 1,292 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 1,409,313 Square feet
Healthcare space 69,334 Square feet
Other energy intensive space

EUI-adjusted floor area, performance year:
16,965,000 Gross square feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
19.50 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):
The majority of the heating and cooling systems in campus buildings are monitored and controlled by Direct Digital Control “Building Automation Systems” (BAS). The various departments have been polled to determine when the buildings are typically considered to be “unoccupied.” The BAS is then programmed to shut key air handling systems down during the unoccupied periods. The control systems in some of the buildings have been configured to allow occupants that may choose to be in the building during unoccupied periods to turn on the air handling system that serves their particular work zone for a pre-determined period of time. Within the past five years, a number of campus buildings have been retrofitted with electronic occupancy sensors to not only shut lights off automatically but also automatically “reset” the temperature control setpoints in the unoccupied periods. When the BAS detects that the area is unoccupied, the air flow into the space is automatically reduced and the temperature setpoints are also reset (increased during the cooling season and decreased during the heating season) to reduce energy consumption during the times the spaces are unoccupied. The BAS has been programmed to make sure the spaces do not get too cool during the heating season or get too warm during the cooling season.

A brief description of Light Emitting Diode (LED) lighting and other energy-efficient lighting strategies employed by the institution:
LED lighting technology has been employed in a number of campus buildings. The LED lighting systems included using “screw-in” LED light bulbs that are used to replace incandescent bulbs or compact fluorescent bulbs. In other areas, linear fluorescent lighting tubes have been replaced with linear LED lighting tubes. In one particular auditorium lighting retrofit application, fifty-two (52) 250-Watt light fixtures were replaced, one for one, with 42-Watt fixtures – a power savings of 208 watts per fixture.

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

A brief description of co-generation employed by the institution, e.g. combined heat and power (CHP):
The University of Iowa has operated a combined heat and power plant since 1926. The power plant is a combined heat and power plant facility that generates about one-third of the University’s electric power needs. Fuels burned at the Power Plant include coal, natural gas, and oat hulls (energy produced from oat hulls is captured in Options 1 and 2). The plant co-generates about 30 percent of the total electric power needs and produces all the steam energy used throughout the campus and hospital facilities. Steam produced by the plant is used for heating, production of chilled water for air conditioning, cooking, sterilizing, humidifying, and energizing other research and process equipment.

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):

The website URL where information about the programs or initiatives is available:

Additional documentation to support the submission:

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.