Overall Rating Gold
Overall Score 74.09
Liaison Merry Rankin
Submission Date Aug. 30, 2019
Executive Letter Download

STARS v2.1

Iowa State University
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 2.37 / 6.00 Jeffrey Witt
Director
Utility Services
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 414300 MMBtu 262118 MMBtu
Electricity from on-site renewables 336 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) 3022819 MMBtu 3294491 MMBtu
Total 3437455 MMBtu 3556609 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year July 1, 2018 June 30, 2019
Baseline Year July 1, 2011 June 30, 2012

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 13310308 Gross Square Feet 12585043 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 0.26 MMBtu / GSF 0.28 MMBtu / GSF
Source energy 0.32 MMBtu / GSF 0.33 MMBtu / GSF

Percentage reduction in total building energy consumption (source energy) per unit of floor area from baseline:
0.71

Degree days, performance year (base 65 °F / 18 °C):
Degree days (see help icon above)
Heating degree days 6776 Degree-Days (°F)
Cooling degree days 1221 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 4240249 Square Feet
Healthcare space 0 Square Feet
Other energy intensive space

EUI-adjusted floor area, performance year:
21948560 Gross Square Feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
19.58 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):
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A brief description of energy use standards and controls employed by the institution (e.g. building temperature standards, occupancy and vacancy sensors):
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A brief description of Light Emitting Diode (LED) lighting and other energy-efficient lighting strategies employed by the institution:
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A brief description of passive solar heating, geothermal systems, and related strategies employed by the institution:
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A brief description of co-generation employed by the institution, e.g. combined heat and power (CHP):

Iowa State has operated a steam-based combined heat and power plant for 125 years. Coal and/or natural gas is burned in boilers to produce high pressure steam. Steam is used to produce electricity in steam turbine generators. Low pressure steam is extracted from the turbines and used for heating and cooling the 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):
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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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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.