In short: Summerville has about 52,600 people and sits in Dorchester County. Dominion Energy South Carolina, Inc, Berkeley Electric Coop Inc and Edisto Electric Coop, Inc serves different parts of Dorchester County, so your utility depends on your address; their 2024 home averages range from 14.59¢ to 16.4¢ per kWh (EIA). FEMA rates Dorchester County hurricanes “relatively high”. Rooftop solar here makes roughly 1,360 kWh a year per kW of panels by our estimate, which is good for solar.
This page covers what is local to Summerville: its utility, outage records, sunshine, weather risks and charging. Statewide rules such as net metering, incentives and electrician licensing are in our South Carolina energy guide and the wider area is covered in the Charleston guide.
Summerville at a glance
- Place: Summerville, Dorchester County, South Carolina; about 52,625 residents (Census Bureau estimate, July 2024).
- Utility: Dominion Energy South Carolina, Inc (investor-owned). Homes paid an average 14.59¢ per kWh in 2024 (EIA-861); the average customer lost 81 minutes of power on normal days and 1,908 counting major storms, with 1.2 interruptions a year (utility-wide, not just Summerville).
- Utility: Berkeley Electric Coop Inc (member-owned cooperative). Homes paid an average 14.93¢ per kWh in 2024 (EIA-861); the average customer lost 89 minutes of power on normal days and 293 counting major storms, with 0.9 interruptions a year (utility-wide, not just Summerville).
- Utility: Edisto Electric Coop, Inc (member-owned cooperative). Homes paid an average 16.4¢ per kWh in 2024 (EIA-861); the average customer lost 293 minutes of power on normal days and 2,355 counting major storms (utility-wide, not just Summerville).
- Sun: 4.64 kWh per square meter per day on average, from 2.56 in December to 6.39 in June (NASA POWER). Our rough estimate: about 1,360 kWh a year per kW of panels.
- Climate: about 2,540 cooling degree-days and 1,840 heating degree-days a year (base 65°F, NASA POWER), so air conditioning is the big load.
- Top hazards in Dorchester County: hurricanes “relatively high”, ice storms “relatively high” and lightning “relatively high” (FEMA National Risk Index; overall county risk rated “relatively moderate”).
- Public charging: 59 ports at 21 locations in Summerville, 5 of them DC fast (AFDC, October 20, 2026).
Your utility and what it means
Dominion Energy South Carolina, Inc is an investor-owned utility and served about 696,385 home customers in 2024; its 14.59¢ average was below the 15.47¢ statewide average for July 2026. Berkeley Electric Coop Inc is a member-owned cooperative utility and served about 115,117 home customers in 2024; its 14.93¢ average was below the 15.47¢ statewide average for July 2026. Edisto Electric Coop, Inc is a member-owned cooperative utility and served about 15,421 home customers in 2024; its 16.4¢ average was above the 15.47¢ statewide average for July 2026. Those are utility-wide averages, not a quote for your address; your own bill is the real number.
For reliability, Edisto Electric Coop, Inc reported 293 minutes per customer without major storms in 2024, more than the statewide figure of 118 (EIA-861). Utility-wide numbers hide a lot: a home at the end of a long rural line usually has more outages than the average.
Net metering, export rates and incentives are set at state level and by each utility. Start with the South Carolina guide and then ask your utility for its current interconnection steps before you sign anything.
Backup power in Summerville
- Hurricanes (relatively high): Hurricanes can mean a week without power. A standby generator on natural gas or propane, or a battery with solar, beats a stack of gas cans; check flood height before you site equipment.
- Ice storms (relatively high): Ice storms bring down lines for days. A standby generator with a transfer switch, or a battery sized for the fridge, furnace blower and well pump, matters more than a small power station.
- Cooling load: an outage in Summerville summer means no air conditioning. A central unit is a big load; a large battery system or standby generator can run it, while a smaller setup keeps fans, a window unit or a mini-split going.
- Short outages: a portable power station covers phones, Wi-Fi, a CPAP and lights; a home battery switches over automatically.
Size your setup with the generator sizing tool and the battery backup calculator, and compare options in backup power. Generator safety (CPSC): outdoors only, at least 20 feet from the house, exhaust away from doors and windows, never in a garage, and battery-powered carbon monoxide alarms inside. A licensed electrician should install any transfer switch, with a permit; see generator installation.
Solar in Summerville
By our rough estimate each kW of panels makes about 1,360 kWh a year in Summerville (NASA sunshine data times 365 days times 0.80 for system losses). Valued at Dominion Energy South Carolina, Inc’s 2024 average of 14.59¢, that is about $198 a year per kW if all of it offsets your own use (an estimate, not a promise). Production swings with the seasons: June is the sunniest month at 6.39 and December the dimmest at 2.56, a 2.5-to-1 gap.
Check your own roof with the solar potential tool, see solar costs and net metering vs net billing, and read the steps in solar installation. Hail and storm exposure are worth raising with installers and your insurer.
Batteries and EV charging
A home battery earns its place when outages are frequent, when your utility pays little for exported solar, or when evening prices are high; compare in home batteries and battery costs. Summerville has 59 public charging ports in the federal station list including 5 DC fast, but home charging is cheaper and easier: see the EV charging cost calculator and EV charger installation.
Drive on another fuel? See every alternative fuel station in Summerville: hydrogen, propane, natural gas, E85 ethanol, biodiesel and renewable diesel.
Permits and inspections
Solar, generator transfer switches and EV chargers normally need an electrical permit from the Summerville building or permitting department, or from Dorchester County if you live outside city limits, and often a utility interconnection approval. We have not verified a local permit page for Summerville, so check the city and county websites or ask your electrician, who will know the process. Hire only a licensed electrician or installer; the South Carolina guide lists the state licensing rules.
Nearby guides
More local guides: Charleston energy guide, North Charleston, Goose Creek and Mount Pleasant, or the whole South Carolina energy guide.
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Summerville energy FAQ
Who is my electric company in Summerville?
Dominion Energy South Carolina, Inc, Berkeley Electric Coop Inc and Edisto Electric Coop, Inc all serve parts of Dorchester County. Which one serves you depends on your street, so check the top of your bill. Their 2024 home price averages differ (Dominion Energy South Carolina, Inc 14.59¢, Berkeley Electric Coop Inc 14.93¢, Edisto Electric Coop, Inc 16.4¢) so it matters for solar math.
How much power will solar make in Summerville?
About 1,360 kWh a year per kW of panels by our estimate, so a 6 kW system would make roughly 8,160 kWh. Shade, roof direction and tilt change this; run your address through the solar potential tool for a better number.
Is a generator or a battery better for hurricanes in Dorchester County?
It depends how long the outage lasts. A battery is quiet, automatic and good for short outages and for pairing with solar; a standby generator keeps going as long as it has fuel, which suits multi-day events. Many homes use a battery for everyday outages and add a generator for the rare long one.
Can solar and a battery run my air conditioner during an outage?
Yes if the system is sized for it. A central air conditioner needs a large battery or generator, so many people back up one room or a mini-split instead. Use the battery backup calculator to see the runtime for your appliances.
Do I need a permit for solar or a generator in Summerville?
Almost always an electrical permit for a transfer switch, solar or an EV charger, issued by the city or county where you live. Your licensed electrician or installer normally pulls it. Never connect a generator to your house wiring without a transfer switch.
Sources: EIA Form 861 (2024) for utility prices and outages; NASA POWER climatology (2001 to 2025) for sun and degree-days; FEMA National Risk Index for county hazards; AFDC station locator for public charging; Census Bureau for population. Estimates are ours and are not promises; see our editorial policy. Prices and programs change, so check each program page.