Overall Rating Silver - expired
Overall Score 45.97
Liaison Tom Hartzell
Submission Date Feb. 28, 2019
Executive Letter Download

STARS v2.1

Calvin University
OP-5: Building Energy Consumption

Status Score Responsible Party
Complete 2.81 / 6.00 Russell Bray
Director of Physical Plant
Physical Plant
"---" indicates that no data was submitted for this field

Figures needed to determine total building energy consumption:
Performance Year Baseline Year
Grid-purchased electricity 76,997.78 MMBtu 85,550 MMBtu
Electricity from on-site renewables 40.60 MMBtu 52.45 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) 182,822 MMBtu 184,078 MMBtu
Total 259,860.38 MMBtu 269,680.45 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 Jan. 1, 2009 Dec. 31, 2009

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 year was chosen as it was after any major renovations and building construction. The baseline year is recent enough to capture reliable data from the past and use that to see how much progress we have made with sustainability efforts.

Gross floor area of building space:
Performance Year Baseline Year
Gross floor area of building space 2,210,347 Gross Square Feet 2,263,247 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 0.12 MMBtu / GSF 0.12 MMBtu / GSF
Source energy 0.19 MMBtu / GSF 0.20 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 6,510 Degree-Days (°F)
Cooling degree days 753 Degree-Days (°F)

Floor area of energy intensive space, performance year:
Floor Area
Laboratory space 57,530 Square Feet
Healthcare space 3,452 Square Feet
Other energy intensive space

EUI-adjusted floor area, performance year:
2,417,868 Gross Square Feet

Building energy consumption (site energy) per unit of EUI-adjusted floor area per degree day, performance year:
14.80 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):

See Kill-a-Watt in credit EN-1.

A brief description of energy use standards and controls employed by the institution (e.g. building temperature standards, occupancy and vacancy sensors):

Most areas are heated to 70 degrees F and cooled to 72 degrees F.

(10.25.18) : HDD and CDD were calculated using for FY 2017-18: https://portfoliomanager.energystar.gov/pm/degreeDaysCalculator
which uses the base of 65 degrees-F as stated for Part 2.

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

The campus is trying to convert more and more spaces to LED. Many large spaces and spaces with daily usage have already been converted to LED lighting. About 1/3 of street lights have been converted to LED. See more information about CERF at https://calvin.edu/support/energy/

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


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


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):

Any building remodeling projects would be looked at as a way to evaluate the current energy consumption items and challenge if there are better alternatives available.

The website URL where information about the programs or initiatives is available:

Additional documentation to support the submission:

The grid purchased electricity comes from 21,000,000+ kWh for Calvin's main bill and ~1,500,000 kWh for the remaining properties in the institutional boundary.
Conversion from kWh to MMBtu was performed with information from the U.S. Energy Information Administration (eia): https://www.eia.gov/energyexplained/index.php?page=about_energy_conversion_calculator
Solar panel power (on-site renewable) comes from Chuck Holwerda.
(JW 1.22.19)

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.