Overall Rating Silver
Overall Score 50.03
Liaison Caroline Bruno
Submission Date May 28, 2019
Executive Letter Download

STARS v2.1

Williams College
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 4.36 / 6.00 Amy Johns
Director
Zilkha Center for Environmental Initiatives
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 135823 MMBtu 139546 MMBtu
Electricity from on-site renewables 99 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) 228959 MMBtu 261222 MMBtu
Total 364881 MMBtu 400768 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year July 1, 2017 June 30, 2018
Baseline Year July 1, 2004 June 30, 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 building energy consumption baseline was chosen because 2005 was immediately prior to the college's first greenhouse gas emissions goals.


Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 2996585 Gross Square Feet 2298096 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 0.12 MMBtu / GSF 0.17 MMBtu / GSF
Source energy 0.22 MMBtu / GSF 0.30 MMBtu / GSF

Percentage reduction in total building energy consumption (source energy) per unit of floor area from baseline:
28.12

Degree days, performance year (base 65 °F / 18 °C):
Degree days (see help icon above)
Heating degree days 7756 Degree-Days (°F)
Cooling degree days 296 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 247000 Square Feet
Healthcare space 13000 Square Feet
Other energy intensive space

EUI-adjusted floor area, performance year:
3541292 Gross Square Feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
12.80 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):

Williams has a campus wide building management system. One of the many things that the BMS is used for is turning buildings to unoccupied mode at appropriate times, with both reduced temperatures and reduced ventilation rates.


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

Williams has installed indoor LED lighting in many campus buildings. We have also installed LED exterior lights throughout much of campus.


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):

In 2002, Williams replaced one of the three boilers at the heating plant with a boiler capable of supporting cogeneration, and installed a steam turbine/generator at the same time.


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.