South Carolina
Commercial solar in South Carolina
Business credits and deadlines, utility limits, and how to judge a proposal for a South Carolina business.
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South Carolina business solar credits compared
| Credit | Amount | Limit | Status |
|---|---|---|---|
| SC solar credit (SC Code §12-6-3587, Form TC-38) | 25% of cost of an owned system | $3,500 per facility per year or 50% of liability; 10-year carryforward | Available; no end date for solar |
| SC Clean Energy Credit (Form TC-54) | Amount certified by SCDOR | $500,000 a year; 15-year carryforward | Available; confirm eligibility with SCDOR |
| SC Solar Energy Property Credit (Form TC-58) | 25% over five years (when available) | Systems of at least 1,900 kW | Repealed 31 December 2024 |
| Federal §48E | Set by federal law | — | Ends for solar placed in service after 2027 where construction begins after 4 July 2026 |
SC Code, SCDOR forms and manual, IRS Form 3468 instructions and Notice 2025-42, retrieved 5 October 2026.
The §48E construction deadline for South Carolina businesses
Federal §48E is the largest incentive left for a South Carolina business system, and it now has a clock.
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).
What counts as beginning construction is set out in IRS Notice 2025-42.
A business planning a project in 2026 should ask its tax adviser how that notice applies before signing, because a start after 4 July 2026 leaves until the end of 2027 to place the system in service. Section 48E explained.
South Carolina utility limits for business solar
| Utility | Non-residential terms we verified |
|---|---|
| Berkeley Electric Cooperative | Renewable Surplus Rider: small commercial up to 100 kW AC; exports at 6.03¢/kWh; not available on time-of-day or demand rates |
| Palmetto Electric Cooperative | Net Billing Rider: non-residential up to 100 kW; $250 application fee; 4.662¢/kWh for 2026–27 |
| Greer Commission of Public Works | Rate code 704, Small Commercial Renewables, with on-peak and off-peak credits; Tier 2 interconnection up to 100 kW |
| Santee Cooper | Metering and standby fees for solar were eliminated in April 2025, for residential and commercial customers; commercial solar rate not verified |
| Dominion Energy South Carolina | Commercial Solar Choice and other options exist; terms not verified |
| Duke Energy Carolinas | Commercial solar options not verified |
Where we write “not verified”, ask the utility for the current tariff sheet before any proposal is priced.
Demand charges and South Carolina commercial solar
Demand charges are why business solar in South Carolina is not a scaled-up home system. Many commercial bills charge for the highest kilowatt demand in the month as well as for energy.
Panels reduce energy bought, but a cloudy afternoon or a late-day load can still set the monthly peak, so solar alone may cut little of the demand charge. A battery dispatched against the peak is the usual tool.
Note that Berkeley Electric’s rider is not available on demand rates at all.
Ask for a proposal that models twelve months of your interval data, with energy and demand savings shown separately.
South Carolina businesses that look at solar
Warehouses and manufacturing
Large flat roofs and daytime loads; check roof age and structural capacity first, and whether a site exceeds co-op size caps.
Retail, offices and restaurants
Daytime opening hours match production; restaurants’ evening peaks may call for storage.
Hotels
Round-the-clock load means most output is used on site, which matters when export credits are low.
Farms
Poultry houses and irrigation pumps. Solar for farms in South Carolina.
Schools and nonprofits
Tax-exempt owners cannot use income tax credits directly. Ask a tax adviser about structures that let a taxable owner hold the system; PPAs are not permitted in South Carolina.
Financing and ROI for South Carolina business solar
South Carolina businesses usually buy with cash, a commercial loan or an equipment lease.
Leases of renewable generation must follow the state’s leasing article: a lessor certified by the Office of Regulatory Staff, one premises per lease.
A business-owned system can combine depreciation, §48E (within its deadline) and the state credits; the order and interaction are for your tax adviser.
Return on investment rests on the same split as at home: on-site use avoids your energy rate, exports earn the utility’s credit, and demand is a separate line. How commercial solar is assessed.
Evaluating a South Carolina commercial solar proposal
Commercial rate, any solar rider, and the demand charge used.
Twelve months of 15-minute or hourly use.
Demand savings are less certain.
§48E construction start and placed-in-service dates; TC-54 certification status.
Remaining roof life and a structural review by a South Carolina engineer.
Third-party sales of electricity from a system on your premises are not permitted in South Carolina.
South Carolina commercial solar by city
Questions
Can a business claim the South Carolina solar tax credit?
What is South Carolina’s Clean Energy Credit?
Is the federal commercial solar credit still available?
Is the TC-58 solar property credit still available?
How large can a commercial solar system be on a South Carolina co-op?
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