South Carolina has one of the most underappreciated solar incentive packages in the Southeast — and arguably the highest state income tax credit of any state in the region. While neighbors like Georgia and Florida offer no state income tax credit at all, South Carolina provides a 25% state tax credit on the cost of your solar installation, up to $3,500 per year. Combined with the federal 30% Investment Tax Credit, this means South Carolina homeowners can recover more than half of their system cost in tax credits alone — before factoring in the value of net metering savings and long-term utility rate protection.
This guide explains every South Carolina-specific solar incentive available in 2026, how they interact, the critical differences between Dominion Energy South Carolina (formerly SCE&G), Duke Energy Carolinas, Duke Energy Progress, and Santee Cooper, and two complete stacking examples showing your realistic net cost and payback period.
The Federal 30% Investment Tax Credit: Your Largest Single Benefit
The federal solar ITC (Investment Tax Credit) under the Inflation Reduction Act gives every South Carolina homeowner who goes solar in 2026 a direct 30% credit against federal income taxes — dollar-for-dollar, not a deduction. This applies to the full installed cost of your system including panels, inverter, racking, wiring, and labor.
For typical South Carolina system sizes and costs:
| System Size | Installed Cost | Federal ITC (30%) |
|---|---|---|
| 6 kW | $19,000–$22,000 | $5,700–$6,600 |
| 8 kW | $25,000–$28,000 | $7,500–$8,400 |
| 10 kW | $30,000–$34,000 | $9,000–$10,200 |
| 12 kW | $36,000–$42,000 | $10,800–$12,600 |
Unused credit carries forward to the following tax year, so if your federal tax liability is smaller than the credit amount, you receive the remainder in subsequent years. The ITC is available through at least 2032 before phasing down to 26% in 2033 and 22% in 2034.
Battery storage systems are also ITC-eligible at 30% when charged exclusively by solar, making a solar-plus-battery system in South Carolina eligible for the full federal credit on both components.
South Carolina State Income Tax Credit: 25% Up to $3,500/Year
This is South Carolina's most distinctive incentive, and it sets the state apart from every other southeastern state. Under South Carolina Code § 12-6-3587, homeowners installing solar energy systems on their primary residence or rental property can claim a state income tax credit equal to 25% of the total installation cost, capped at $3,500 per year.
Key mechanics of the South Carolina solar tax credit:
Credit calculation: 25% of your total installed cost. On a $28,000 system, the credit is $7,000. Since it is capped at $3,500 per year, the full $7,000 credit is claimed over two years ($3,500 in year one, $3,500 in year two).
Carry-forward period: Unused credit can be carried forward for up to 10 tax years. This protects homeowners whose annual state tax liability is lower than the $3,500 annual cap — you will eventually receive the full credit as long as you have state tax liability in future years.
Combined with federal ITC: These credits are independent and additive. You claim the federal ITC on your federal Form 5695 and the South Carolina credit on South Carolina Form I-335. Critically, South Carolina's credit is calculated on the full installation cost before the federal credit is applied, not on the reduced post-credit cost. This means you are not penalized for also claiming the federal ITC — both apply to 100% of your installation cost.
No income cap: The South Carolina solar credit has no income phase-out or income eligibility restriction. Any homeowner with South Carolina income tax liability can claim it regardless of income level.
Example: A 10 kW system installed for $32,000
- Federal ITC: 30% × $32,000 = $9,600 (claimed in year of installation)
- SC State Credit: 25% × $32,000 = $8,000 total (capped at $3,500/year → claimed over 3 years: $3,500 + $3,500 + $1,000)
- Combined credit: $17,600 — more than half the system cost
Net Metering in South Carolina: Utility-by-Utility Guide
South Carolina's net metering rules are governed by the Distributed Energy Resource Customer Generation statute (SC Code § 58-40-10 et seq.) and orders from the South Carolina Public Service Commission (PSC). The rates and mechanics vary by utility.
Dominion Energy South Carolina (formerly SCE&G)
Dominion Energy South Carolina serves approximately 800,000 customers in the central and western parts of the state, including Columbia, Aiken, and Rock Hill.
- Net metering rate: Retail rate (approximately $0.13–$0.15/kWh in 2026) for energy exported to the grid when your production exceeds your consumption
- System size cap: 20 kW for residential (most homes need 6–12 kW)
- Billing: Monthly netting; annual true-up with any end-of-year credit carried forward or settled at the avoided-cost rate
- Interconnection timeline: 30–90 days for typical residential applications
Duke Energy Carolinas (western SC)
Duke Energy Carolinas serves the western Piedmont region of South Carolina including Gaffney and Cherokee County.
- Net metering rate: Retail rate for residential customers with systems under 20 kW
- Annual true-up: April 30 settlement date; excess credits roll over monthly with annual settlement
- Connection fee: Duke may require a small interconnection application fee ($25–$75)
Duke Energy Progress (central/eastern SC)
Duke Energy Progress serves portions of central and eastern South Carolina.
- Net metering rate: Retail rate for residential systems under 20 kW
- Billing cycle: Monthly netting; annual billing anniversary true-up
- Demand charges: Large systems (above 20 kW) may face demand charge tariffs — residential homeowners are unlikely to encounter this
Santee Cooper (low country and coastal SC)
Santee Cooper is South Carolina's state-owned electric utility, serving the coastal low country including parts of Myrtle Beach, Conway, and the Pee Dee region.
- Net metering: Available for systems up to 20 kW at the retail rate
- Local programs: Santee Cooper periodically offers energy efficiency rebates that may complement solar installations — check Santee Cooper's website for current promotions
- Direct customers and co-op customers: Some Santee Cooper customers receive power through the Central Electric Power Cooperative — verify with your specific cooperative whether net metering terms differ
Electric Cooperatives in SC
South Carolina has more than 20 rural electric cooperatives serving approximately one-third of the state's electric customers. Cooperative net metering policies vary:
- Many follow the state PSC's net metering guidelines with retail-rate compensation for systems under 20 kW
- Some smaller co-ops have lower system size caps or different billing mechanics
- Always verify directly with your cooperative before committing to a system size
South Carolina Property Tax Exemption
South Carolina exempts the value added to your property by a solar installation from property tax assessment under SC Code § 12-37-3135. This is a 100% exemption on the increase in assessed value attributable to the solar energy system.
South Carolina's effective property tax rate averages approximately 0.5–0.6% of assessed value (among the lowest in the Southeast), but assessments can still be significant in higher-value markets:
- Charleston County: 0.53% effective rate
- Richland County (Columbia): 0.56% effective rate
- Greenville County: 0.55% effective rate
- Horry County (Myrtle Beach): 0.39% effective rate
For a solar installation that adds $18,000–$22,000 to your home's market value, the property tax exemption saves approximately $90–$130 per year at South Carolina's average rate. Over a 25-year system life, this represents $2,250–$3,250 in cumulative savings at current rates — not as impactful as the property tax exemptions in high-rate states like New Jersey (2.4%), but still meaningful.
No Sales Tax Exemption in South Carolina
South Carolina does not offer a general sales tax exemption on solar equipment, unlike states such as Florida, New York, Massachusetts, and Colorado. South Carolina's state sales tax rate is 6%, with local county taxes adding 1–2% in most areas (total 7–8% in many counties).
On a $30,000 installed system, the absence of a sales tax exemption represents approximately $2,100–$2,400 in additional out-of-pocket cost compared to states with full exemptions. Advocates have periodically proposed sales tax exemptions in the SC General Assembly, but no such exemption was enacted as of mid-2026.
When comparing South Carolina to Georgia or Florida, which also lack sales tax exemptions, this is not a differentiator. But relative to peer states with exemptions (NC has a partial sales tax exemption; NC and VA offer broader exemptions), it represents a modest gap in South Carolina's incentive stack.
USDA REAP for Rural South Carolina
The USDA Rural Energy for America Program (REAP), dramatically expanded by the Inflation Reduction Act with $2.5 billion in new funding, provides grants of up to 50% of total project cost for:
- Agricultural producers (farmers, growers, livestock operations, aquaculture, etc.)
- Rural small businesses with gross revenues under approximately $1 million
REAP is particularly valuable in South Carolina's agricultural counties (Orangeburg, Williamsburg, Marion, Dillon, Marlboro, Colleton, and others). A farm in Orangeburg County installing a 25 kW system at $75,000 could receive a $37,500 REAP grant — before applying the 30% federal ITC on the remaining basis.
REAP applications are accepted through USDA Rural Development's state office in Columbia. Open application windows are published on the USDA website; multiple application periods typically occur each year.
Low-Income Solar Access Programs
South Carolina homeowners with income at or below 200% of the federal poverty level may access:
- SC Community Development Block Grant programs: Some counties and municipalities administer CDBG funds that include energy efficiency and solar access components for low-income households
- Weatherization Assistance Program (WAP): Free energy efficiency upgrades that reduce energy burden and improve home readiness for solar installation
- LIHEAP: Bill payment assistance for income-qualifying households; reduces immediate energy cost burden
- Utility low-income programs: Dominion Energy South Carolina and Duke Energy both offer bill assistance programs and are expanding community solar access for customers who cannot install rooftop solar
South Carolina is not among the leading states for low-income solar programs, but federal Inflation Reduction Act funding continues to expand accessible pathways for income-qualifying households through the U.S. Department of Energy's Solar for All program.
South Carolina Solar Financing Options
The 25% state credit and 30% federal ITC together can recover 55% of your system cost in the first few years — making the math on common financing options attractive:
Cash purchase: Lowest total cost; full ITC and state credit apply immediately. Most financially optimal if you have the capital.
Solar loan: Rates of 5–8% APR available through solar-specific lenders, credit unions, and Dominion Energy's own financing programs. With $17,000+ in credits recovered in years 1–3 (on a $30,000 system), a $30,000 loan at 6% for 15 years results in monthly payments of approximately $253, which is typically offset by the $130–$175/month in utility bill savings from day one.
Power Purchase Agreement (PPA) or lease: Third-party installers may offer PPA arrangements (pay-per-kWh at a fixed rate) or leases in South Carolina. Important: if you lease the system, the federal ITC and South Carolina state credit belong to the leasing company, not to you. Only cash purchase or loan ownership entitles the homeowner to claim the credits directly. See the solar lease vs. purchase guide for a full comparison.
PACE financing: Property Assessed Clean Energy financing is not broadly available in South Carolina's residential market as of 2026.
Full Stacking Examples: South Carolina Homeowners in 2026
Example 1: Charleston Area Homeowner, Dominion Energy South Carolina
System: 9 kW, installed cost $29,000 Annual production: 13,140 kWh (4.9 peak sun hours/day — coastal SC gets substantial sun) Annual electricity rate (Dominion, ~$0.135/kWh): $1,774 offset per year Annual bill savings (assuming 90% offset): $1,597/year
| Incentive | Value |
|---|---|
| Federal 30% ITC | −$8,700 |
| SC State 25% Credit ($3,500/yr cap, 3-year claim) | −$7,250 |
| Property tax exemption (0.53% rate, $16K added value, 25 yr) | −$2,120 |
| Net metering savings | −$1,597/year |
| Net installed cost (after ITC + SC credit) | ~$13,050 |
| Simple payback (net cost ÷ annual savings) | ~8.2 years |
Example 2: Columbia Homeowner, Dominion Energy South Carolina
System: 8 kW, installed cost $26,500 Annual production: 11,440 kWh (4.8 peak sun hours/day — Columbia averages 212 sunny days/year) Annual electricity bill savings (~$0.135/kWh, 90% offset): $1,394/year
| Incentive | Value |
|---|---|
| Federal 30% ITC | −$7,950 |
| SC State 25% Credit ($3,500/yr cap × 2 years = $6,625) | −$6,625 |
| Property tax exemption (0.56% rate, $14K added value, 25 yr) | −$1,960 |
| Net metering savings | −$1,394/year |
| Net installed cost (after ITC + SC credit) | ~$11,925 |
| Simple payback (net cost ÷ annual savings) | ~8.6 years |
Both examples reflect strong payback periods by Southeast standards — and notably better payback than Georgia (8–12 years depending on system size and Georgia Power sizing threshold) or Florida (average 9–11 years without a state income tax credit).
South Carolina vs. Southeast Peers
| State | State Tax Credit | Sales Tax Exemption | Net Metering | Peak Sun |
|---|---|---|---|---|
| South Carolina | 25% (up to $3,500/yr) | No | Retail rate | 4.6–5.0 hrs |
| North Carolina | 35% credit (expired 2015); no current credit | Partial | Retail rate (HB 589) | 4.7–5.1 hrs |
| Georgia | None | No | Retail rate (≤10 kW) | 4.7–5.1 hrs |
| Florida | None | Yes (6%) | Retail rate | 5.0–5.5 hrs |
| Tennessee | None | No | Below-retail (TVA) | 4.5–4.9 hrs |
| Virginia | None | Yes (partial) | Retail rate | 4.2–4.7 hrs |
South Carolina's 25% state credit is the standout advantage vs. all Southeast peer states. North Carolina had a 35% credit historically (expired 2015); no southeastern state currently offers a higher ongoing state credit than South Carolina's 25%. This is the primary reason South Carolina buyers should prioritize going solar in 2026 rather than waiting — the state credit is a policy choice that could change with each General Assembly session.
South Carolina Solar Market Outlook
South Carolina's solar market has grown rapidly, driven by falling panel prices, favorable climate conditions (4.6–5.0 peak sun hours statewide), and the uniquely strong state credit. Key trends for 2026:
- Rising utility rates: Dominion Energy South Carolina and Duke Energy have both filed for rate increases to fund grid modernization and transition from coal generation. Higher future rates increase the value of net metering over time.
- Increasing installer competition: The number of licensed solar contractors operating in South Carolina has grown significantly since 2020, increasing competition and driving down installed costs.
- Battery storage growing: Dominion Energy SC territory customers are increasingly pairing solar with battery backup as concerns about hurricane season grid reliability grow — battery systems installed alongside solar are fully ITC-eligible.
- Policy stability: The SC PSC has maintained retail-rate net metering for residential customers; no regulatory proceeding was pending to reduce this rate as of mid-2026. However, utility advocacy for reduced net metering compensation is ongoing nationally, making 2026 a favorable time to lock in the current framework.
How to Get Started in South Carolina
- Gather 12 months of electricity bills: This determines the correct system size. The goal for most homeowners is 90–100% annual offset.
- Get 3–5 quotes from SC-licensed contractors: Require itemized proposals including equipment brand/wattage, all labor, permit fees, and estimated interconnection timeline.
- Confirm your utility territory: DTE vs. Consumers vs. Santee Cooper vs. co-op matters for net metering rates and interconnection processes.
- Verify net metering eligibility: Confirm with your utility that a system of the proposed size qualifies for retail-rate net metering (most systems under 20 kW do in South Carolina).
- Plan your tax credit timing: If your installation closes in late 2026, confirm with a tax advisor whether to file the federal ITC and SC state credit in the 2026 or 2027 tax year and how to structure the SC carry-forward claim.
- Understand total timeline: Permit submission, interconnection approval, and physical installation typically take 4–6 months from contract signing in most South Carolina markets. See the solar installation timeline guide for a phase-by-phase breakdown.
Conclusion
South Carolina's solar incentive package in 2026 is the strongest in the Southeast by a significant margin, primarily because of the 25% state income tax credit (up to $3,500/year, with 10-year carry-forward) that no neighboring state matches. Combined with the federal 30% ITC, South Carolina homeowners can recover more than half of a typical system's cost in tax credits — before net metering savings are counted.
The absence of a sales tax exemption is the one notable gap in South Carolina's incentive stack, but it is not unique to SC among southeastern states. The fundamental economics remain compelling: 8–10 year payback periods in Charleston and Columbia, 25 years of expected system life, and growing utility rates that increase net metering value every year.
For the full picture of what a solar investment looks like financially, use the solar payback period calculator, review total installation cost expectations, and explore financing options to decide whether cash purchase or a solar loan makes sense for your household. To compare South Carolina to other southeastern states, see the 2026 state-by-state solar incentives guide.
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