Rooftop Solar in South Carolina
The South Carolina Energy Freedom Act was enacted in 2019 to allow the expansion of the solar market, both large scale and residential installations, lifting previous caps on net metering and solar leasing. According to the SC State Energy Office, solar installations have increased 99% in Beaufort county since 2019.
The systems on this Cane Island House include a super-efficient geothermal heat pump for ambient heat and hot water, 11.9kW solar panel array, Tesla Powerwall battery—along with a tight building enclosure, low solar heat gain coefficient windows, and occupancy sensors that activate ERV’s.
Two Tesla Powerwall2 batteries at a recent project
What is net-metering?
Net-metering is the process by which a home with rooftop solar sells excess energy to the utility company, and draws energy from the grid when the solar system is not producing energy (like at night). The customer will always have electricity, provided the grid is functioning properly. The new legislation requires that the utility companies buy power from customers producing excess energy at the same rate that they sell to consumers.
What about battery storage for solar energy?
Batteries like the Tesla Powerwall can be connected to solar panels to store excess energy. At times when the solar panels are not producing energy, the consumer can tap into the energy stored in the battery. These batteries are really cool, but they may not be practical for the average consumer. They are expensive and one battery probably does not have the capacity to power a whole house. The technology is rapidly advancing, and battery backup may soon be a more practical option. We have a number of clients who have installed solar connected batteries in order to keep essential appliances and lights on in the event of power failure. In our hurricane prone area, I think this approach is smart. Often, the days following a major storm are sunny, but it may take utility companies days to weeks to restore power. A house with a solar array + battery would be sitting pretty!
Net-metering is an essential piece of the growth of solar power in South Carolina. Alternative, renewable energy will continue to be a sound choice for South Carolinian’s; both for our wallets and for our environment!