Overall Rating Gold - expired
Overall Score 68.31
Liaison Lisa Noriega
Submission Date Aug. 3, 2020

STARS v2.2

Yale University
OP-1: Emissions Inventory and Disclosure

Status Score Responsible Party
Complete 1.73 / 3.00 Lindsay Crum
Chief Manager for Sustainability Operations & Strategic Data
Yale Office of Sustainability
"---" indicates that no data was submitted for this field

Has the institution conducted a GHG emissions inventory within the previous three years that includes all Scope 1 and 2 emissions? :

A copy of the most recent GHG emissions inventory:
A brief description of the methodology and/or tool used to complete the GHG emissions inventory:
Yale began reporting on its GHG emissions in 2005, when it set a goal to reduce emissions by 43% from 2005 levels by 2020. These emissions were defined as purchased electricity that passes through Yale's Central Power Plant, Sterling Power Plant, and Central Campus Chiller Plant, along with all gas and oil that is consumed by Yale's Central Power Plant and Sterling Power Plant.
Yale also recently began reporting its GHG emissions to The Climate Registry (TCR), using TCR's General Reporting Protocol. Emissions are quantified using standardized methodologies, and is consistent with the World Resources Institute's Greenhouse Gas Protocol Corporate Standard, which is recognized as an international best practice. We will be transitioning solely to TCR in 2020, which is the end date for our current GHG emissions reduction goal.

Has the GHG emissions inventory been validated internally by personnel who are independent of the GHG accounting and reporting process and/or verified by an independent, external third party?:

A brief description of the GHG inventory verification process:
The inventory conducted for The Climate Registry has been verified by an external third party. The inventory included here (which is using the methodology consistent with our 2005 baseline) has not been externally verified.

Documentation to support the GHG inventory verification process:

Gross Scope 1 GHG emissions, performance year:
Weight in MTCO2e
Stationary combustion 197,431 Metric tons of CO2 equivalent
Other sources (mobile combustion, process emissions, fugitive emissions) 3,461 Metric tons of CO2 equivalent

Total gross Scope 1 GHG emissions, performance year:
200,892 Metric tons of CO2 equivalent

Gross Scope 2 GHG emissions, performance year (market-based):
Weight in MTCO2e
Imported electricity 9,929 Metric tons of CO2 equivalent
Imported thermal energy 0 Metric tons of CO2 equivalent

Total gross Scope 2 GHG emissions, performance year:
9,929 Metric tons of CO2 equivalent

Gross GHG emissions from biogenic sources, performance year:
0 Metric tons of CO2 equivalent

Does the GHG emissions inventory include Scope 3 emissions from the following sources?:
Yes or No Weight in MTCO2e
Business travel Yes 5,441 Metric tons of CO2 equivalent
Commuting Yes 27,975 Metric tons of CO2 equivalent
Purchased goods and services Yes 305,068 Metric tons of CO2 equivalent
Capital goods No ---
Fuel- and energy-related activities not included in Scope 1 or Scope 2 No ---
Waste generated in operations No ---
Other sources No ---

Total Scope 3 GHG emissions, performance year:
338,484 Metric tons of CO2 equivalent

A brief description of how the institution accounted for its Scope 3 emissions:
Commuting data comes from our bi-annual transportation survey; PG&S data comes from spenddata from our procurement department; and business travel data comes from a combination of spend data (from trip reimbursements) and data from Egencia (our travel booking website). It should be noted that while these categories are the only three reflected as part of this version of our GHG emissions inventory, we have a much more robust Scope 3 data tracking system linked to our Climate Registry efforts. As part of this effort, we are measuring business travel, commuting, all purchased goods & services (as opposed to just a subset), capital goods, FERA, and waste generated in operations. All of this information will be reflected in our next submission to STARS, because at that point we will have met our 2020 goal and be reporting on our inventory exclusively through TCR.

Has the institution completed an inventory within the previous three years to quantify its air pollutant emissions?:

Annual weight of emissions for::
Weight of Emissions
Nitrogen oxides (NOx) 17.48 Tons
Sulfur oxides (SOx) 4.83 Tons
Carbon monoxide (CO) 8.10 Tons
Particulate matter (PM) 7.20 Tons
Ozone (O3) 0 Tons
Lead (Pb) 0 Tons
Hazardous air pollutants (HAPs) 0 Tons
Ozone-depleting compounds (ODCs) 0 Tons
Other standard categories of air emissions identified in permits and/or regulations 10.10 Tons

Do the air pollutant emissions figures provided include the following sources?:
Yes or No
Major stationary sources Yes
Area sources No
Mobile sources No
Commuting No
Off-site electricity production No

A brief description of the methodology(ies) the institution used to complete its air emissions inventory:
The reported emissions of criteria air pollutants are calculated based upon using the best available method for each emission source and each pollutant. We have NOx CEMS (Continuous Emission Monitoring Systems) on 10 of our Powerplant units (4 Turbines, 3 Boilers and 3 Generators). CEMS are certified emissions measurement systems that have daily calibration tests and quarterly QA/QC requirements. For the other pollutants for the same Powerplant units we use fuel usage multiplied by an emission factor. We also have some Boilers that do not require CEMS so we use their fuel usage for NOx and the other pollutants. For the emission factors, if we have recent test data we will use that for the emission factors. If we do not have test data we use emission factors published in EPA AP-42 documents. For emergency generators we may not have fuel usage so we use runtime and multiply that by the maximum firing rate to get fuel usage. This may overstate fuel usage a bit, but these units run very little so this is acceptable. Then we use either manufacturer’s published emission test data or EPA AP-42.

Gross Scope 2 GHG emissions from purchased electricity (location-based):

Gross Scope 2 GHG emissions from imported thermal energy (location-based) :

Website URL where information about the institution’s emissions inventories is available:

Additional documentation to support the submission:

Data source(s) and notes about the submission:
Ozone, lead, hazardous air pollutants, and ozone-depleting compounds not available.

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.