Charleston, SC
Solar for Farms in Charleston, SC
Where farm solar fits in Charleston County’s small, vegetable-heavy agriculture, and where it does not.
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Charleston County agriculture in numbers
| Measure (2022) | Charleston County | Why it matters for solar |
|---|---|---|
| Farms | 370 (down 8% since 2017) | A small market; few local crews specialise in farm work |
| Land in farms | 38,727 acres; average farm 105 acres | Room for a ground mount is not usually the constraint |
| Woodland in farms | 16,413 acres, more than cropland (10,389) | Tree shade around fields and barns needs checking |
| Vegetables sold | $11.9 million (7th in SC); 1,258 acres harvested, including 333 acres of tomatoes | Summer irrigation and cooling loads line up with solar output |
| Nursery, greenhouse, floriculture and sod | $6.1 million | Greenhouse fans and pumps run in daylight |
| Irrigated land | 1,089 acres | Pumping is the most solar-friendly farm load |
| Poultry and eggs | $139 thousand | Poultry-house ventilation loads are rare here |
| Farms with sales of $100,000+ | 53 of 370 | The likeliest candidates for a dedicated system |
USDA NASS, 2022 Census of Agriculture, County Profile: Charleston County, South Carolina, retrieved 5 October 2026.
Farm electricity uses near Charleston that suit solar
Irrigation pumps, walk-in coolers and packing sheds, and greenhouse fans all draw most of their power on sunny summer days, which is when panels produce.
That is the best match on a Lowcountry vegetable farm. Barns and equipment sheds with only lights and a few tools use little, and a small array there rarely pays for its own meter and interconnection; the farmhouse’s residential rider may be the better route.
With poultry and livestock sales small in Charleston County large poultry-house ventilation loads are rare here.
Separate meters matter. A pump at a field edge is often on its own account and rate; ask the utility which rate each meter is on before deciding where the array goes.
Interconnecting a farm system near Charleston: Berkeley Electric or Dominion
Santee Cooper’s Johns Island transmission project says the island is served by both Berkeley Electric and Dominion, and the project also covers Wadmalaw, Seabrook and Kiawah. Check each farm meter on Berkeley Electric’s territory search.
Berkeley Electric’s Renewable Surplus Rider allows small commercial systems up to 100 kW AC and residential systems up to 20 kW AC, credits exports at 6.03¢/kWh, charges $150 to apply and $50 for inspection, and is not available on time-of-day or demand rates.
On Dominion, farm accounts billed as non-residential choose among the business programs described on commercial solar in Charleston; a farmhouse on a residential account uses the Solar Choice rider.
Ground mount or rooftop on a Charleston-area farm
A ground mount near a pump or packing shed avoids old barn roofs, but outside City limits it is permitted by Charleston County Building Inspection Services, which asks for structural design analysis for wind and seismic loads and an electrical schematic that shows any battery.
Inside the City, a ground array also goes through zoning review. Either way, low-lying fields need the inverter and disconnects above flood level. Barn roofs work if the structure can carry the load and the roof has years left; the engineer’s letter will say.
Size the array to the loads on the meter it serves, not to the land available: under Berkeley Electric’s rider, the size cap is annual kWh ÷ 1,800.
Costs, incentives and payback for farm solar near Charleston
We do not publish a farm solar price for the Charleston area. Fixed costs that are published include the utility application fees above and, inside City limits, the permit fee table on solar cost in Charleston.
Payback depends on how much of the output the farm uses itself: on Berkeley Electric, each kilowatt-hour used on the farm saves the retail rate on that meter, while each exported one earns 6.03¢.
For incentives, a farm that buys its system can claim South Carolina’s 25% credit within its annual cap, and a farm business may look at the state Clean Energy Credit (TC-54) and the federal §48E business credit while its deadlines last.
Leased and business systems may use §48E; it ends for wind and solar placed in service after 2027 where construction begins after 4 July 2026 (Form 3468 instructions; Notice 2025-42).
USDA’s Rural Energy for America Program (REAP) has historically offered grants and guaranteed loans to agricultural producers for renewable energy; we could not confirm its current grant status at USDA, so call USDA Rural Development’s South Carolina office before planning around it.
Full list: solar incentives in Charleston and solar for farms in South Carolina.
Questions a Charleston-area farm should ask before going solar
Berkeley Electric’s rider is not available on time-of-day or demand rates.
Self-use saves the retail rate; exports earn far less.
Parts of Johns Island are inside the City and parts are unincorporated; confirm which office issues the permit.
Keep inverters and disconnects above it.
Mowing, vegetation control and post-storm checks on a ground mount.
Each year’s claim is capped at the lesser of $3,500 or half of liability.
Questions
Is solar a good fit for farms near Charleston, SC?
How many farms are in Charleston County?
Which utility serves farms on Johns Island and Wadmalaw?
Can a farm near Charleston get a USDA REAP grant for solar?
What size solar system can a farm install on Berkeley Electric?
Can a farm sign a solar PPA in South Carolina?
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