South Carolina Solar Panel Cost & Incentives

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

The state's Energy Freedom Act (Act 236, signed in 2019) was a turning point for distributed solar in South Carolina. It established net metering rights, clarified solar leasing rules, and set the foundation for growth. Duke Energy Carolinas and Dominion Energy South Carolina are the two primary utilities, and both now have well-established solar interconnection processes.

South Carolina's solar market has grown dramatically over the past decade — installed capacity has increased roughly tenfold. The combination of the state tax credit, strong sunshine, property/sales tax exemptions, and retail-rate net metering creates a compelling financial picture that's hard to find in other southeastern states.

South Carolina averages 4.5–5.2 peak sun hours per day, with the strongest resource in the coastal Lowcountry (Charleston, Myrtle Beach, Hilton Head) and the Midlands (Columbia). Even the Upstate region (Greenville, Spartanburg) receives 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 restructuring. Blue Raven Solar, SunPower, and several strong local companies (Greenville Solar, Alder Energy Systems) serve the state. The competitive installer market means pricing has stayed reasonable — typically $2.70–$3.10/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 homeowners discover the state tax credit. The SC Office of Regulatory Staff tracks solar adoption data and interconnection queues.

South Carolina's net metering policy was established by the Energy Freedom Act of 2019 (Act 236). Key provisions:

• Available for residential systems up to 20 kW • Customers receive full retail rate credit for excess generation sent to the grid • Credits roll over month-to-month • Annual true-up occurs at the end of the billing year • Both Duke Energy Carolinas and Dominion Energy SC are required to offer net metering

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. As of mid-2026, the existing retail-rate structure is still in place, but homeowners should factor in the possibility that terms could change over the system's 25-year life.

Duke Energy also offers a separate solar rebate program in some rate territories — but participation in that program may affect your net metering eligibility. Read the fine print carefully.

For rural electric cooperatives in South Carolina, net metering policies vary by co-op. Some (like Palmetto Electric Cooperative on Hilton Head) have adopted solar-friendly policies; others are more restrictive. Contact your co-op directly.

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

State solar tax credit (still active in 2026): • 25% of installation costs • Capped at $3,500 per year OR 50% of state income tax liability, whichever is less • Unused credits carry forward for up to 10 years — this means even if your tax liability is low, you'll eventually capture the full benefit • Applies to the total system cost including labor and equipment

Property tax exemption: • Solar installations are exempt from property tax increases — the added home value from solar is not taxed

Sales tax exemption: • Solar equipment is exempt from South Carolina's 6% state sales tax — saving $800–$1,500 on a typical residential system

What South Carolina does NOT offer: • A state solar rebate program (distinct from the tax credit) • State battery storage incentive

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

Battery storage in South Carolina is growing, particularly for homeowners in coastal areas concerned about hurricane-related outages. South Carolina's Atlantic coast is exposed to tropical storms annually, and multi-day power outages are not uncommon after major storms.

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

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

For most South Carolina homeowners, the primary reasons to add storage are: • Hurricane and storm backup (especially coastal SC) • Self-consumption of solar to reduce grid dependence • Future-proofing against potential net metering policy changes