South Carolina Solar Incentives 2026: The Complete Picture
The South Carolina solar incentives 2026 headline is a 25 percent state income tax credit with no expiration date. Under S.C. Code Section 12-6-3587, homeowners claim 25 percent of system cost against state taxes, up to $3,500 per year or 50 percent of their tax liability, whichever is less, carrying unused amounts forward up to 10 years. The Department of Revenue confirms no repeal date for residential systems. On a $24,000 installation that is a $6,000 credit, usable across two tax years for most households.
This durability matters. Most state credits phase out or sunset; South Carolina's simply persists. With the federal credit gone, it is now the primary tax incentive for Palmetto State homeowners, and it stacks with net metering benefits and a property tax exemption.
Net Metering in Transition: Know Your Rider
South Carolina no longer offers simple 1:1 retail net metering to new customers. Duke Energy customers on legacy interim riders keep them through May 31, 2029. New customers choose between two paths. The Net Metering Bridge (NMB) rider compensates exports at an annualized avoided-cost credit, enrolls through October 1, 2027, and locks terms for 15 years once you join. The RSC time-of-use rider adds a grid access fee and minimum bill with monthly netting at avoided cost.
The practical lesson: exported power is worth avoided cost, not retail, so size your system to your own consumption and consider a battery to use midday surplus in the evening. If you are on a legacy rider, do nothing to jeopardize it.
Tax Treatment and Duke Rebates
- State tax credit: 25% of cost, $3,500/year cap, 10-year carryforward, no repeal date (S.C. Code 12-6-3587).
- Property tax: exempt for residential systems up to 20 kW, owned or leased.
- Sales tax: no residential equipment exemption confirmed; do not assume one.
- Duke Energy rebates: residential rebate phases have varied by docket and capacity caps. Confirm any current per-kW figure directly with Duke Energy Carolinas or Duke Energy Progress before including it in your math.
- Federal: no 25D credit for 2026 purchases; leased systems may carry federal value via the owner's commercial credit.
Costs and Payback in South Carolina
Southeast installed prices run near $2.60 to $3.00 per watt, so an 8 kW system costs roughly $21,000 to $24,000. The 25 percent state credit removes about $5,250 to $6,000 across two tax years, bringing effective cost near $16,000. With moderate electricity rates and avoided-cost export economics, payback typically lands at 9 to 12 years.
File the state credit carefully, keep your install invoice, and verify every quote with our 2026 benchmarks and red flags guide.