| Overall Rating | Silver - expired |
|---|---|
| Overall Score | 54.25 |
| Liaison | Sarah Fortner |
| Submission Date | March 1, 2019 |
| Executive Letter | Download |
Carleton College
OP-5: Building Energy Consumption
| Status | Score | Responsible Party |
|---|---|---|
|
3.78 / 6.00 |
Martha
Larson Manager of Campus Energy and Sustainbility Facilities |
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indicates that no data was submitted for this field
Part 1
This credit is based on energy inputs from offsite sources and electricity produced by onsite renewables. When the institution purchases one fuel and uses it to produce heat and/or power, you should enter only what is purchased. For example, if the institution purchases natural gas to fuel a CHP system and produce steam and electricity, only the purchased natural gas should be reported.
| Performance Year | Baseline Year | |
| Grid-purchased electricity | 44,901 MMBtu | 48,811 MMBtu |
| Electricity from on-site renewables | 12,654 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) | 149,087 MMBtu | 156,288 MMBtu |
| Total | 206,642 MMBtu | 205,099 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, 2007 | June 30, 2008 |
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 baseline corresponds with Carleton's first greenhouse gas inventory that was aided and verified by Sightlines, a facilities benchmarking and analysis firm.
Gross floor area of building space:
| Performance Year | Baseline Year | |
| Gross floor area of building space | 1,950,164 Gross square feet | 1,680,023 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 | 0.11 MMBtu per square foot | 0.12 MMBtu per square foot |
| Source energy | 0.16 MMBtu per square foot | 0.18 MMBtu per square foot |
Percentage reduction in total building energy consumption (source energy) per unit of floor area from baseline:
15.75
Part 2
| Degree days (see help icon above) | |
| Heating degree days | 8,003 Degree-Days (°F) |
| Cooling degree days | 901 Degree-Days (°F) |
Floor area of energy intensive space, performance year:
| Floor Area | |
| Laboratory space | 168,744 Square feet |
| Healthcare space | 550 Square feet |
| Other energy intensive space |
EUI-adjusted floor area, performance year:
2,369,932
Gross square feet
Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
9.79
Btu / GSF / Degree-Day (°F)
Optional Fields
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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):
Sustainability Assistants work on peer to peer education and outreach at New Student Week, in the residence halls, Climate Action Week, and other areas. The campus community is now very comfortable with common lighting controls like occupancy sensors and automatic dimming.
A brief description of energy use standards and controls employed by the institution (e.g. building temperature standards, occupancy and vacancy sensors):
Campus standard is 68 degrees in winter 74 degrees in summer. Each week, Carleton's HVAC technicians enter the weekly classroom and office room schedule information into the Building Automation System so temperature setbacks can be employed during unoccupied hours.
A brief description of Light Emitting Diode (LED) lighting and other energy-efficient lighting strategies employed by the institution:
LED retrofit kits and new LED lights are now the standard for the Carleton maintenance department. Our current efforts are low-wattage LED lights with occupancy sensors in enclosed stairwells so they can be reduced to minimum footcandles when unoccupied. Carleton recently replaced over 100 highly inefficient MR16 light bulbs with LEDs in our language and dining facility and one section of the Gould Library. Exterior wall packs are being replaced by LED fixtures as they burn out. We are also beginning to install bi-level LED light fixtures with occupancy sensors in all enclosed stairwells. Furthermore, all underwater pool lights in our two swimming facilities have been replaced with LED lights this summer.
A brief description of passive solar heating, geothermal systems, and related strategies employed by the institution:
None at this time, but our geothermal system is under construction and will come online in fall of 2019. The system is tied to our campus-wide district energy system, so it serves all buildings. More information can be found here: https://apps.carleton.edu/geothermal/
A brief description of co-generation employed by the institution, e.g. combined heat and power (CHP):
None at this 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):
Carleton has engaged professional engineering firms to perform ASHRAE Level 2 energy audits on ten primary campus buildings. Audits focused on high energy users such as athletic buildings, science building and dining facilities. Audit efforts continue, with the goal of auditing all building on the district energy system within 5-6 years.
The website URL where information about the programs or initiatives is available:
Additional documentation to support the submission:
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Data source(s) and notes about 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 or simply email your inquiry to stars@aashe.org.