Overall Rating Gold
Overall Score 66.38
Liaison Olivia Shehan
Submission Date Nov. 13, 2018
Executive Letter Download

STARS v2.1

Wellesley College
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 2.42 / 6.00 Dorothea Von Herder
Sustainability Coordinator
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 29,381.50 MMBtu 2,331 MMBtu
Electricity from on-site renewables 36.76 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) 473,759.05 MMBtu 577,055.55 MMBtu
Total 503,177.31 MMBtu 579,386.55 MMBtu

Start and end dates of the performance year and baseline year (or 3-year periods):
Start Date End Date
Performance Year Jan. 1, 2017 Dec. 31, 2017
Baseline Year July 1, 2006 June 30, 2006

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):

Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 2,596,103 Gross Square Feet 2,462,855 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 0.19 MMBtu / GSF 0.24 MMBtu / GSF
Source energy 0.22 MMBtu / GSF 0.24 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 5,942 Degree-Days (°F)
Cooling degree days 654 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 69,206 Square Feet
Healthcare space 4,900 Square Feet
Other energy intensive space

EUI-adjusted floor area, performance year:
2,791,749 Gross Square Feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
27.33 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):

During winter session when fewer students remain on campus for optional January classes, it is mandatory for leaving students to close the blinds and lower the thermostat/ turn off heat in their dorm rooms as the remaining students are moved into one complex such that significantly fewer buildings must remain heated. All appliances must also be unplugged during this time. This policy is a collaborative effort between the Office of Sustainability and Facilities, including Custodial Services and Residential Life.

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

The Office of Sustainability has made sure to continue to replace lamps in the Wellesley College lanterns with high efficiency LED lamps, which reduce electrical consumption by over 50%. In addition, student room lights are now being replaced with LEDs as well, which will lower energy consumption from 54 watts to 22 watts per fixture. The quality of the lights also improve with these renovations.

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

Our college employs green roofs over parts of our campus center, Alumnae Hall, and our Water Treatment Vault, which assist in passive cooling.

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

The college has the ability to island if necessary, but we have agreed to purchase 5% of our electrical energy as renewable through the town. We do use the waste heat from cogeneration for electricity, to produce steam, domestic hot water, and chill water through absorption chillers. Cogen utilizes almost 50% of total energy from the performance year, using natural gas, which is the cleanest burning fossil fuel. Further, the campus utilizes natural gas in its boilers and has significantly reduced its use of number 6 oil.

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):

Where possible in new buildings energy efficient appliances and systems are put in place.

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.