
Utility-scale batteries adjacent to solar panels at Dominion’s Scott Solar Facility. Photo credit: Richmond Times-Dispatch
by James A. Bacon
A utility-scale battery storage system has gone online at Dominion Energy’s Scott Solar Facility in Powhatan County, according to the Richmond Times-Dispatch. During the day when solar output is peaking, excess energy is rerouted to the batteries. When the sun goes down and output falls, batteries release electricity back into the grid. The 12-megawatt battery complex can power 3,000 homes for up to four hours.
The purpose of the Scott Solar project is to give Dominion real-world experience in understanding how batteries can integrate into the larger electric grid. Dominion officials contend that battery storage can be a more cost-effective way to meet high-demand periods than, in the RTD’s words, building “an entirely new generation facility.”
The “levelized cost” of electricity, which includes up-front capital costs, operating costs, and fuel costs (which are zero for solar) over the lifetime of the project, is lower for solar than any other energy source available on a large scale in Virginia. However, solar farms are part of a larger system that must meet the demand for electricity 24/7. Solar facilities, while highly cost-efficient on a stand-alone basis, are highly variable. Output cannot be dialed up and down as needed. Therefore, they require significant backup. Batteries are one means of providing that backup. And batteries have a cost. Continue reading