Charleston, SC
Commercial Solar in Charleston, SC
The utility programs, permits and credits a Charleston business works with, and how to judge a proposal.
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Dominion’s non-residential solar programs for Charleston businesses
| Program | Who it is for | Size limit | How exports are paid |
|---|---|---|---|
| Solar Choice (Rate 16 time-of-use) | Small general service non-residential customers | Offset up to 100% of annual use, 1,000 kW max | Excess credited by on-peak and off-peak period; annual true-up at avoided cost; 10-year term from interconnection |
| Buy All / Sell All | All non-residential customers | 100 kW on PR-1; above 100 kW on the PR standard offer | All generation sold to Dominion; you buy power at your normal rate |
| Offset Only | All non-residential customers | None stated | No credit for excess energy |
| Offset / Sell | Medium to large general service customers | 100 kW on PR-1; above on the standard offer | Use what you make; excess sold at PR-1 or the standard offer |
Dominion Energy South Carolina, SC Non-Residential Solar Programs chart, retrieved 5 October 2026. The chart is undated and may pre-date current tariffs; confirm each program and its rate in Dominion’s tariff book before modelling.
Berkeley Electric members: small commercial systems up to 100 kW AC can use the Renewable Surplus Rider (6.03¢/kWh), but it is not available on demand or time-of-day rates, which many larger commercial accounts are on.
Which Charleston businesses suit solar
The best fits use most of their power in daylight and own, or hold a long lease on, the roof.
In Charleston that points to warehouses and light industrial buildings with large flat roofs, offices and schools that run on weekdays, and refrigerated businesses whose cooling load peaks on summer afternoons.
Hotels and restaurants on the Peninsula use plenty of power, but many occupy historic buildings where the BAR’s visibility rules, small roofs and rooftop mechanical equipment limit the array; behind-parapet flat roofs are the exception the Board prefers.
Businesses that lease their space need the landlord’s consent and a lease long enough to recover the cost.
Schools, churches and nonprofits owe little or no income tax, so a credit-based payback does not apply to them as written; ask a tax adviser which federal route, if any, fits before relying on one. Farms near the city are covered separately on solar for farms near Charleston.
Demand charges and commercial solar savings in Charleston
Many commercial tariffs charge for the highest kilowatt demand in the month as well as for energy.
Solar cuts energy purchases reliably, but a cloud at the wrong 15 minutes can leave the peak demand untouched, so a proposal that books large demand savings from panels alone deserves scrutiny.
Storage sized to shave the peak is how demand charges are usually attacked.
We have not verified Dominion’s current Rate 16 or general service demand prices, so this page gives none: ask for the proposal to show your actual tariff, twelve months of interval data and the savings split between energy and demand.
City of Charleston permit fees for a commercial solar array
Commercial work uses the same construction-cost table as residential alterations, with tiers that fall above $50,000.
| Example contract | Permit fee | Plan review (50%) | Application fees (building + electrical) | City total |
|---|---|---|---|---|
| $75,000 | $360 | $180 | $80 | $620 |
| $250,000 | $910 | $455 | $80 | $1,445 |
| $750,000 | $2,160 | $1,080 | $80 | $3,320 |
HyreSolar arithmetic on the City of Charleston Building and Trade Permit Fee Schedule (effective 1 October 2019), retrieved 5 October 2026. Contract values are examples, not prices. Commercial plan revisions are $100 per trade discipline.
Fire Marshal, Engineering, BAR, Design Review Board and zoning fees may apply on top; the schedule lists them as separate.
Incentives for commercial solar in Charleston
The federal §48E credit is the bigger lever for most commercial projects, and its cut-off is tight: solar where construction begins after 4 July 2026 must be in service by the end of 2027.
Projects that need it should treat the beginning-of-construction rules in IRS Notice 2025-42 as the critical path.
South Carolina’s Clean Energy Credit (TC-54) allows up to $500,000 a year with a 15-year carryforward; its eligibility rules are on the form.
The state’s Solar Energy Property Credit (TC-58), for nonresidential systems of at least 1,900 kW, is listed by the Department of Revenue as repealed on 31 December 2024.
The 25% credit under §12-6-3587 applies to any taxpayer who buys a qualifying system, subject to its $3,500 annual cap. Statewide detail: commercial solar in South Carolina and solar incentives in Charleston.
Storage and financing for a Charleston business
Storage earns on a commercial account by trimming demand peaks and by keeping refrigeration, servers or point-of-sale running when storms knock the grid out; NOAA recorded about 24 damaging wind events a year in Charleston County from 2015 to 2025.
Equipment placement matters on low-lying sites: the City requires 2 feet of freeboard above base flood elevation for non-residential substantial improvements and new construction.
Businesses usually pay cash, borrow, or lease. A third party cannot sell a business the electricity from panels on its premises in South Carolina, so a commercial PPA is not available; leases require an Office of Regulatory Staff certificate. Residential loan arithmetic is on solar financing in Charleston.
Evaluating a commercial solar proposal in Charleston
Solar Choice on Rate 16, PR-1, standard offer, Offset Only or Offset/Sell.
Monthly totals cannot show demand peaks.
Demand savings from solar alone should be modest and justified.
Construction start and placed-in-service dates against the §48E deadlines.
A roof that needs replacing in ten years means paying to remove and reinstall the array.
Engineered to the City’s 150 mph design wind speed.
BAR or Design Review Board approval where the building requires it.
Questions
What solar programs does Dominion offer Charleston businesses?
Is the federal solar credit still available for a Charleston business?
Can a Charleston business sign a solar PPA?
Does solar reduce demand charges?
How much is a City of Charleston permit for a commercial solar array?
Can a business in the historic district install solar?
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