South Carolina Solar Panel Cost & Incentives

South Carolina is one of the few states in the Southeast that still offers a meaningful state solar tax credit. The 25% credit, capped at $3,500 per year but carryable forward for up to 10 years, makes SC one of the more attractive places to install residential solar even after the federal 30% ITC expired in December 2025.

The Energy Freedom Act (Act 236, signed in 2019) was the turning point for distributed solar here. It established net metering rights, clarified the rules around solar leasing, and gave the market enough certainty to actually scale. Duke Energy Carolinas and Dominion Energy South Carolina are the two primary utilities, and both have well-established solar interconnection processes at this point.

South Carolina's installed solar capacity has grown roughly tenfold over the past decade. The state tax credit, strong sunshine, property and sales tax exemptions, and retail-rate net metering combine into a financial picture that's hard to find in other southeastern states.

South Carolina averages 4.5 to 5.2 peak sun hours per day, with the strongest resource in the coastal Lowcountry (Charleston, Myrtle Beach, Hilton Head) and the Midlands around Columbia. The Upstate around Greenville and Spartanburg gets solid irradiance comparable to most of North Carolina.

Residential solar adoption has accelerated sharply since 2020. Palmetto Solar, headquartered in Charleston, was one of the fastest-growing solar companies in the country before its restructuring. Blue Raven Solar, SunPower, and several strong local companies like Greenville Solar and Alder Energy Systems serve the state. The competitive installer market means pricing has stayed reasonable, typically $2.70 to $3.10 per watt.

South Carolina's installed solar capacity puts it in the top 15 nationally. Utility-scale projects have driven most of the growth, but residential rooftop installations are increasing as more homeowners discover the state tax credit. The SC Office of Regulatory Staff tracks solar adoption data and interconnection queues, and that data is useful if you want a sense of how active your local market is.

South Carolina's net metering policy was established by the Energy Freedom Act of 2019 (Act 236). Residential systems up to 20 kW qualify, customers receive full retail-rate credit for excess generation sent to the grid, credits roll over month to month, and an annual true-up occurs at the end of the billing year. Both Duke Energy Carolinas and Dominion Energy SC are required to offer it.

The long-term stability of 1:1 retail-rate net metering is uncertain. Duke Energy has filed proposals with the SC Public Service Commission to modify net metering compensation rates more than once. The current retail-rate structure is still in place, but homeowners should factor in the possibility that the terms could shift over the system's 25-year life.

Duke Energy also offers a separate solar rebate program in some rate territories. Participation in that program may affect your net metering eligibility, and the interaction between the rebate and net metering is not always intuitive. Read the fine print before opting in to either program.

For rural electric cooperatives in South Carolina, net metering policies vary by co-op. Palmetto Electric Cooperative on Hilton Head has adopted relatively solar-friendly policies; others are more restrictive. Call your specific co-op before assuming the IOU rules apply to you.

South Carolina's incentive stack is among the best in the Southeast.

The state solar tax credit is still active. It covers 25% of installation costs, capped at $3,500 per year or 50% of your state income tax liability, whichever is less. Unused credits carry forward for up to 10 years, which means most homeowners eventually capture the full benefit even if their annual tax liability is small. The credit applies to the total system cost including labor and equipment.

Property tax exemption: solar installations are exempt from property tax increases, so the added home value from solar isn't taxed.

Sales tax exemption: solar equipment is exempt from South Carolina's 6% state sales tax, saving $800 to $1,500 on a typical residential system.

What South Carolina doesn't offer: a state rebate program separate from the tax credit, or a state battery storage incentive.

The federal 30% ITC expired in December 2025. The SC state credit alone can reduce your system cost by $3,500 to $10,000+ over the carry-forward period, depending on your installation cost and tax situation.

Battery storage in South Carolina is growing, especially in coastal areas where homeowners worry about hurricane-related outages. The Atlantic coast gets exposed to tropical storms every year, and multi-day power outages after major storms aren't unusual.

There's no state-specific battery storage incentive. The federal battery ITC expired alongside the solar ITC in December 2025, so the full $10,000 to $15,000 installed cost is on the homeowner.

Duke Energy has piloted virtual power plant programs that enroll residential batteries for grid support during peak demand events. If those programs expand, battery owners could receive annual payments for allowing their batteries to discharge during grid stress events.

For most South Carolina homeowners considering storage today, the case is one of three things: hurricane and storm backup (especially on the coast), self-consumption to reduce grid dependence, or hedging against potential net metering policy changes. The pure financial case from rate arbitrage doesn't quite get there yet.