Renewable Energy on Campus

Agnes Scott is currently pursuing several energy options for buildings and operations on campus. 

Solar Power 

If the Sunshine State were not already taken, Georgia might call itself so for all its potential for solar photovoltaic technology. Agnes Scott College currently houses a total of five solar arrays on campus, four of which are owned by third-party investors. The four owned by investors are part of Georgia Power’s Advanced Solar Initiative (GPASI). GPASI increases Georgia Power’s purchasing of solar energy. The program incentivizes small/medium solar projects by ensuring the purchase of surplus energy generated. The four externally-funded arrays’ environmental attributes have been ​retired i​n Agnes Scott’s name, generating about 150 metric tons of carbon emissions equivalent, or REC-like credits that are only applicable to our carbon commitment with Second Nature. Read more about the case study here. 

It is recommended that we pursue solar photovoltaic procurement at a large scale, as our energy efficiency efforts will only reduce our footprint by so much. We can begin incrementally adding solar to our energy generation, while continuing to execute efficiency projects, narrowing our dependency on fossil fuels.

In addition to reducing the college’s emissions in this unique way, these arrays serve as an excellent research tool and model for other nonprofits and educational institutions looking to shift to solar energy. The five solar arrays now generate 342,200 kW hours per year of renewable energy, which is enough to power 31 average-sized U.S. homes. Plans are underway for Agnes Scott to add additional solar on campus in the near future. Combined with energy conservation and efficiency efforts, more solar will help ensure the college meets the interim goal of reducing its carbon footprint 50% by 2022, and eventually 100% by 2037.


Geothermal Energy

In 2014 Campbell Hall, Agnes Scott's former science center built in 1951, was renovated and outfitted with a brand new hydro-geothermal HVAC system. 40 wells 455ft deep each were dug in the adjacent Science Quad creating a closed-loop circuit. Refrigerant runs through these pipes, using the constant 64 degree temperature of the earth to heat the building in the winter, and cool the building in the summer. Additionally, all of the residual heat is used to heat the domestic hot water in the building. Geothermal HVAC systems are currently regarded as the most efficient HVAC system available on today's market. By using this system in conjunction with a dry cooler, Agnes Scott is saving 500,000 gallons of water a year.

10% of Agnes Scott College’s campus footprint is heated and cooled with geothermal technology, replacing natural gas combustion in Campbell Hall, Rebekah Scott Hall, and partially in Main Hall. The installation of these systems gained us high-ranking scores for LEED certification (Campbell, Gold, and Rebekah, Platinum) and the national campus sustainability rating, STARS. The educational benefit of these systems is invaluable, as well; other colleges and organizations use our campus as a site of renewable energy innovation and an example of an institution that is truly investing in a sustainable future. That being said, going forward, it is recommended to prioritize more cost-effective carbon mitigation solutions. Each geothermal HVAC system, from design to installation, has a high cost with comparatively low carbon reduction value versus solar installation or other energy efficiency upgrades. Renewable energy technologies for heating, however, are not usually very cost-effective, so it is worthwhile to consider many options and consider the best one.

As of 2018 Agnes Scott College is a leader in the use of geothermal energy with two buildings heated and cooled by geothermal systems, which combined equal more than 10% of the college’s 1 million square footage of usable space. When Campbell Hall, the college’s former science center, underwent renovations in 2014, the college decided to install the most energy efficient system available. After completing a feasibility study, a geothermal system was designed for the 1951 building that uses 40 wells, each 455 feet deep, in a closed-loop circuit. The earth’s constant 64 degree temperature allows the geothermal system to heat Campbell Hall in the winter and cool the building in the summer. To ensure that no energy is wasted, the system also heats domestic hot water in the building with residual heat from the geothermal system. Beyond saving energy - no natural gas and very little electricity needed - this system is also projected to save Agnes Scott 500,000 gallons of water every year. 

The 1905 Rebekah Scott Hall underwent renovation between May 2017 to August 2018 and the building is certified LEED Platinum by the U.S. Green Building Council. A former surface parking lot was turned into the geothermal field with a sustainable landscape planted instead of asphalt. The graphic below shows the details for the Rebekah project. Like Campbell Hall, in Rebekah, geothermal once again provides heating and air conditioning system for the building, and also heats the domestic hot water with residual heat. This additional geothermal HVAC project was a crucial element in keeping Agnes Scott on track with its climate action plan.

 screen-shot-2020-12-09-at-5.06.41-pm.png

 

geothermal-bags 

Soil samples from test-drilling for the Campbell Hall Renovation

screen-shot-2020-12-08-at-3.55.04-pm.png

Geothermal Heat Pump Rebekah Hall