Solar in South Carolina: State Tax Credit Keeps the Math Working

South Carolina does not get the solar attention that North Carolina does. Its neighbor to the north ranks in the top 5 nationally for solar capacity, largely driven by utility-scale projects. But for residential homeowners, South Carolina has something most states do not — a 25% state tax credit that stacks on top of whatever federal incentives exist.

With the federal ITC gone as of 2026, that state credit is now the single most valuable residential solar incentive in the Southeast. Here is what it means for your bottom line.

The Good News

25% State Solar Tax Credit

South Carolina offers a state income tax credit equal to 25% of the cost of a solar installation, capped at $3,500 per year. The credit can be carried forward for up to 10 years, which means even if your annual tax liability is low, you can claim the full amount over time.

For a $24,000 system, the total credit is $6,000. If your state tax bill is $3,500 or more, you claim $3,500 in year one and $2,500 in year two. If your tax liability is lower, you spread it further.

This is one of the best state solar credits in the country, and it partially replaces the lost federal ITC.

Good Solar Resource

South Carolina averages 4.8-5.3 peak sun hours per day, above the national average. The coastal and southern regions get the most, but even the upstate (Greenville, Spartanburg) gets solid production. An 8 kW system typically produces 10,500-11,500 kWh per year depending on location.

Net Metering Available

South Carolina requires investor-owned utilities (Duke Energy Carolinas, Duke Energy Progress, Dominion Energy SC) to offer net metering for systems up to 20 kW. Excess generation is credited at the full retail rate. This is essential for the solar math to work.

Co-ops and municipal utilities have varying policies — check your specific utility.

Property Tax Exemption

South Carolina exempts the added value of a solar system from property taxes. Given SC property tax rates of 0.5-0.6% on primary residences (assessed at 4% of market value), this is a modest but real benefit.

The Challenges

No Federal Tax Credit

The 30% federal ITC expired January 1, 2026. On a $24,000 system, that is $7,200 lost. The state credit recovers about $6,000 of that, but the net effect is still a higher out-of-pocket cost than homeowners faced in 2025.

Moderate Electricity Rates

South Carolina electricity rates average $0.13-$0.15/kWh — lower than the national average. Lower rates mean lower savings per kWh, which extends the payback period. This is the main drag on SC solar economics.

Duke Energy Dominance

Duke Energy serves most of the state and has historically been cautious about distributed solar. While net metering is available, interconnection timelines can be slow and program caps have been a concern. Work with an installer experienced in Duke territory.

The South Carolina Solar Math (2026)

Typical 8 kW system:

• Installed cost: $23,200 ($2.90/watt)
• Federal ITC: $0 (expired January 1, 2026)
• State tax credit (25%, capped): ~$5,800 (claimed over 2 years)
• Net cost after state credit: ~$17,400

Annual production: ~11,000 kWh

Average retail rate: $0.14/kWh

Annual bill savings: ~$1,540

Payback period: ~11.3 years

25-year savings: $25,000-$35,000

The payback is moderate — not as fast as northeastern states with high rates, but reasonable for the Southeast. The state tax credit is doing heavy lifting here. Without it, the payback would push past 15 years.

Since the state tax credit is so central to the math, getting accurate system pricing from multiple installers matters — even a $0.10/watt difference changes your credit amount and payback timeline.

When Solar Makes Sense

Install if:

• Your monthly electricity bill is over $130
• You have sufficient SC state income tax liability to use the 25% credit
• You are on Duke Energy or Dominion with net metering access
• Your roof faces south or southwest with minimal shading
• You plan to stay in the home 10+ years

Wait or skip if:

• Your electricity bill is under $90/month
• You have very low state tax liability (retirees, note the 10-year carryforward)
• You are on a co-op or municipal utility without net metering
• Your roof has heavy shading or needs replacement soon

Key Takeaways

• The 25% state tax credit (up to $3,500/year) is the most valuable incentive — claim it over multiple years if needed
• No federal ITC as of 2026, but the state credit recovers much of the loss
• Net metering at full retail is available from Duke and Dominion — essential for the math
• SC electricity rates are moderate ($0.13-$0.15/kWh), which keeps payback in the 11-12 year range
• Good sun hours (4.8-5.3) mean solid production across the state
• Property tax exemption adds modest but real long-term value
• Check your specific utility — co-ops and munis may not offer net metering

South Carolina's state tax credit makes it one of the better solar states in the Southeast. The economics are not as strong as the Northeast or California, but for homeowners with decent sun exposure and state tax liability, it is a solid long-term investment.

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