South Carolina Solar Guide 2026
Everything South Carolina homeowners need to know: costs, incentives, net metering policy, and what makes this state unique for solar.
Reviewed by Marcus Vance · Planning data requires verification against your utility and state program source.
Policy dataset review cadence: every 45 days · next review 2026-09-07 · program effective dates and expiration rules must be confirmed in the linked source.
Quick answer
South Carolina solar economics depend on your roof, utility and quote. This page uses illustrative assumptions of 5 peak sun hours, $2.8/W and 14.0 cents/kWh; these are not verified current market averages or account rates.
Notes updated 2026-07-24
- Best for
- South Carolina homeowners comparing solar costs, incentives, and payback assumptions.
- Inputs needed
- annual kWh usage, utility rate, installed $/W, net-metering policy
- Formula used
- Planning production = system kW x peak sun hours x 365 x (1 - 14.08% losses). Retail-value ceiling = production x assumed retail price; actual export value can be lower.
- Method references
- state incentive data, utility tariff checks, Wattcrunch price benchmarks
Key fact about South Carolina solar
South Carolina's 25% state tax credit (up to $3,500/year, spreadable over 10 years) is one of the most generous state incentives in the Southeast, largely compensating for the end of the federal credit.
Peak sun hours
5
hrs/day planning assumption
Illustrative energy rate
14.0¢
per kWh
Illustrative install cost
$2.8/W
before incentives
Illustrative 8 kW system in South Carolina
Annual production
12,544 kWh
Retail-value ceiling, not savings
$1,756
System cost (est.)
$22,400
Includes 14.08% planning losses. Valuing all production at retail is a ceiling, not a net-billing savings estimate; actual self-use, export rates and ownership costs change the result. No new Section 25D homeowner credit in 2026.
Worked example
South Carolina: a transparent 8 kW planning example
This example shows how the published South Carolina assumptions flow through a simple first-pass calculation.
Example household usage
10,800 kWh/year
Estimated production
12,544 kWh/year
Rate used in the example
14.0 cents/kWh
Retail-value ceiling, not bill savings
$1,756/year before ownership costs
South Carolina Net Metering Policy
Full retail net metering (by law)
South Carolina mandated full retail net metering in 2014. Duke Energy and Dominion Energy SC must credit exports at retail. Monthly net excess rolls forward annually.
South Carolina Solar Incentives
Programs require eligibility checks and cannot always be combined. Federal 25D credit is $0 for new homeowner-owned systems in 2026.
- ✓State income tax credit: 25% of cost (up to $3,500/year)
- ✓Property tax exemption
- ✓Sales tax exemption on solar equipment
Top Utilities in South Carolina
Interconnection timeline: 4–8 weeks
State-specific decision guide
What to verify before signing a South Carolina solar quote
In South Carolina, the financial result depends on more than sunshine or the headline installation price. Confirm the export rule, program eligibility date, and interconnection timeline for your exact utility before treating a payback estimate as a promise.
Export value
This page models full retail net metering (by law). Ask which tariff and export credit apply to your account, not only which program name appears in the proposal.
Incentive eligibility
Check equipment, income, installer, application, and placed-in-service rules before subtracting an incentive from the quote. Programs can close or change terms.
Interconnection
Budget for the published 4–8 weeks and confirm who pays for a required meter, service upgrade, or engineering review.
Source trail: production assumptions use NREL PVWatts; incentive discovery should be checked against DSIRE; electricity-market context is available from the EIA. Confirm final tax treatment with the IRS and your utility.
Calculate your South Carolina solar economics
Savings links carry illustrative planning inputs. Replace them with your actual tariff and quote; sizing still needs your usage and production assumptions.
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