In short: Hilton Head Island has about 38,200 people and sits in Beaufort County. Dominion Energy South Carolina, Inc and Palmetto Electric Coop Inc serves different parts of Beaufort County, so your utility depends on your address; their 2024 home averages range from 12.79¢ to 14.59¢ per kWh (EIA). FEMA rates Beaufort County hurricanes “very high”. Rooftop solar here makes roughly 1,400 kWh a year per kW of panels by our estimate, which is good for solar.
This page covers what is local to Hilton Head Island: 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.
Hilton Head Island at a glance
- Place: Hilton Head Island, Beaufort County, South Carolina; about 38,158 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 Hilton Head Island).
- Utility: Palmetto Electric Coop Inc (member-owned cooperative). Homes paid an average 12.79¢ per kWh in 2024 (EIA-861); the average customer lost 32 minutes of power on normal days and 631 counting major storms, with 0.7 interruptions a year (utility-wide, not just Hilton Head Island).
- Sun: 4.80 kWh per square meter per day on average, from 2.64 in December to 6.53 in May (NASA POWER). Our rough estimate: about 1,400 kWh a year per kW of panels.
- Climate: about 2,680 cooling degree-days and 1,070 heating degree-days a year (base 65°F, NASA POWER), so air conditioning is the big load.
- Top hazards in Beaufort County: hurricanes “very high”, lightning “relatively high” and coastal flooding “relatively high” (FEMA National Risk Index; overall county risk rated “relatively high”).
- Public charging: 35 ports at 15 locations in Hilton Head Island, 18 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. Palmetto Electric Coop Inc is a member-owned cooperative utility and served about 68,338 home customers in 2024; its 12.79¢ average was below 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, Dominion Energy South Carolina, Inc reported 81 minutes per customer without major storms in 2024, less 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 Hilton Head Island
- Hurricanes (very 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.
- Lightning (relatively high): Lightning causes short outages and damages electronics. Surge protection and a battery that switches over automatically protect the things you care about.
- Cooling load: an outage in Hilton Head Island 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 Hilton Head Island
By our rough estimate each kW of panels makes about 1,400 kWh a year in Hilton Head Island (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 $204 a year per kW if all of it offsets your own use (an estimate, not a promise). Production swings with the seasons: May is the sunniest month at 6.53 and December the dimmest at 2.64, 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. Hilton Head Island has 35 public charging ports in the federal station list including 18 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 Hilton Head Island: 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 Hilton Head Island building or permitting department, or from Beaufort County if you live outside city limits, and often a utility interconnection approval. We have not verified a local permit page for Hilton Head Island, 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: Bluffton, or the whole South Carolina energy guide.
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Hilton Head Island energy FAQ
Who is my electric company in Hilton Head Island?
Dominion Energy South Carolina, Inc and Palmetto Electric Coop Inc both serve parts of Beaufort 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¢, Palmetto Electric Coop Inc 12.79¢) so it matters for solar math.
How much power will solar make in Hilton Head Island?
About 1,400 kWh a year per kW of panels by our estimate, so a 6 kW system would make roughly 8,400 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 Beaufort 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 Hilton Head Island?
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.