Solar Panel Cost in South Carolina: $2.61/W, 22.6-Yr Payback

Solar in South Carolina costs about $20,880 for 8 kW at $2.61/W and pays back in roughly 22.6 years at 15.5¢/kWh with the federal credit at $0.

Updated September 2026 · Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23

By SolarCostData Data Desk · Reviewed September 2026 · Corrections log

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Why this number

Solar panels in South Carolina cost about $2.61 per watt — $20,880 for a typical 8 kW system — and pay back in roughly 22.6 years at the state’s 15.5¢/kWh average rate, with the 2026 federal credit at $0. Net billing pays exports below retail here.

Everything below uses South Carolina’s real average residential electricity rate (15.5¢/kWh, EIA) and a production band of about 1,385 kWh per kW per year. Both are stated openly because they are the two inputs that decide the answer. These are estimates for sanity-checking a quote, not a quote.

Run it with your own numbers

Why South Carolina’s payback lands where it does

South Carolina’s average rate climbed about five percent to 15.5 cents per kilowatt-hour this July from 14.7 cents a year earlier, landing the state at rank 31 — squarely mid-pack. A solid yield of 1,385 kilowatt-hours per installed kilowatt doesn’t fully offset that middling rate, and the payback runs to about 22.6 years. Dominion Energy South Carolina, the largest utility with nearly 696,000 residential customers, prices at 14.6 cents, just under the state average, so its customers should expect a payback close to the statewide 22.6-year figure. Duke Energy Carolinas’ South Carolina territory, at 14.0 cents, and the South Carolina Public Service Authority, at 11.4 cents, both run cheaper still. South Carolina compensates exports under net billing rather than full retail, so self-consumption at whichever local rate applies is the main lever behind the state’s long payback, with the past year’s modest rate growth nudging it only slightly in a better direction.

Electric utilities in South Carolina

The state average hides real spreads between utilities. The largest residential utilities EIA-861 lists for South Carolina, with each one’s own average bundled residential price (2024 — revenue ÷ sales, the audited annual figure, not this month’s tariff):

Your utility decides South Carolina’s real number — the ZIP lookup finds it in three clicks; the 2024 annual utility averages above sit apart from the June-2026 monthly 15.5¢ state figure.

South Carolina’s rate, the last 24 months

July 2025 → July 2026: 14.7¢ → 15.47¢. The rate tracker has every month against the US average.

An 8 kW system in South Carolina, priced out

The $2.61/W used above comes from EnergySage marketplace quotes (August 2026). Those are quotes in a competitive online market, not signed contract prices.

Read that table with one caveat: $2.61/W is South Carolina’s market average, and it is the input most likely to differ for you. A quote $0.50 per watt above or below the $2.61 used here moves the payback by roughly a year and a half in either direction.

How much sun South Carolina actually gets

A kilowatt of panels in South Carolina produces about 1,385 kWh a year on an unshaded, south-facing roof at a 20-degree pitch. Sites that swap South Carolina’s 1,385 kWh for a single national average are how Arizona and Washington end up with identical paybacks despite a 1.6x real difference in output.

That figure is a five-point cluster around South Carolina’s largest metro area, which keeps it representative of where most people actually live rather than of the state’s best site.

Two adjustments matter before you apply this to your own roof:

• Shading and orientation. The 1,385 kWh figure assumes an unobstructed south-facing array. A real South Carolina roof — its own azimuth and pitch, a tree or a chimney — typically produces 10-25% less; this page models 90% of the ideal, so the 9,972 kWh/year above is already derated from 11,080. A genuinely unshaded south roof can adjust upward in the calculator.
• Year-to-year weather moves output by roughly ±5% either way.

How South Carolina compares with the other 49

South Carolina ranks 31st of 50 on electricity price and 30th on annual output value per kW installed — close enough that its rate is a fair proxy for its solar case, which is not true everywhere. Its immediate neighbors on price are West Virginia (15.8¢) just above and Arizona (15.4¢) just below.

Georgia is South Carolina’s closest comparable-rate analogue — 16.3¢/kWh, roughly 1,385 kWh per kW, and a payback within about a year of this one (23.1 vs 22.6 years). If you find South Carolina quotes hard to sanity-check, Georgia numbers are broadly transferable.

Net billing: the rule that decides solar in South Carolina

South Carolina does not credit exports at the retail rate — this is net billing , not net metering. The program is Solar Choice Metering (Act 62), in force since 2021-06-01, and it credits surplus power at an assumed 4.6¢/kWh, about 30% of retail, because no per-kWh figure is published — against a retail rate of 15.5¢.

Because a typical South Carolina home uses only about 40% of its generation as it is produced, most of what the panels make is sold at 4.6¢. That is why the payback above is 22.6 years rather than the 14.1 years the same hardware would return under full-retail net metering. Raising self-consumption — a battery (worth its own arithmetic: is a home battery worth it? ), an EV charged in daylight, daytime occupancy — is the lever that closes the gap. Whether a South Carolina buyer should own a battery or take a lease/TPO deal is priced in the battery buy vs. TPO calculator .

Published rates date from 2022.

One limit worth knowing: this reflects investor-owned, state-regulated utilities; South Carolina’s municipal utilities and co-ops are exempt in most cases and set their own terms.

South Carolina’s own solar tax credit, and what else is left

The 30% federal credit ended for systems completed after December 31, 2025, so it is $0 here as everywhere. What remains is state, utility and local — and it varies far more than the federal rule ever did.

Solar Energy Credit (S.C. Code 12-6-3587) — 25% of system cost, capped at $3,500. Capped at $3,500 per facility per year OR 50% of your tax liability, whichever is LOWER, with a ten-year carryforward and no sunset. That 50% liability test is skipped by most calculators and means the full $3,500 often cannot be taken in a single year. On the $20,880 system modeled above that is worth up to $3,500. Note the 50% liability test: you would need at least $7,000 of state tax owed in a year to take the full amount, which is why the carryforward matters here. The paperwork side of claiming it is walked through in our solar tax season checklist .

Tax exemptions

Property tax is fully exempt on the added value, so the system does not raise your assessment. Also applies to batteries.

How South Carolina’s package stacks up against the other states’ credits, rebates and exemptions is laid out on the solar incentives hub .

Is solar worth it in South Carolina at 15.5¢/kWh?

South Carolina is close to the national middle on both inputs, which makes it the state where the quote matters most. At 15.5¢ and 1,385 kWh per kW there is no margin from geography to absorb an expensive installer.

At a horizon that long, owning the roof is not the only route to cheaper power. Community solar versus rooftop walks through the subscription alternative — no roof, no loan, and no 22.6-year wait — which is worth reading before committing capital in a market like South Carolina’s.

If you want a fast gut check before running the numbers above, the should-I-go-solar screener asks the four questions that matter most in a mid-rate state like South Carolina.

Two numbers put that in context. At South Carolina’s rate, the electricity an 8 kW system would produce is worth about $895 a year, so the system costs roughly 23.3 years of that output to buy outright — a simple division, before costs. The headline 22.6-year figure above is the full model: it additionally counts 2.5%/yr rate inflation, $150/yr of running costs and one inverter replacement, which is why the two differ slightly. And doing nothing is not free: 25 years of that same electricity, with rates rising at 2.5% a year, comes to about $52,705.

For a 15-year payback in South Carolina — given its sunshine rather than a national average — the electricity rate would need to be about 14.4¢/kWh. South Carolina is at 15.5¢, which is above that line.

Sources and method

• Electricity rate: U.S. Energy Information Administration, average price by state — EIA Table 5.6.A, July 2026 data (released Sep 2026). Rate shown is South Carolina’s residential average.
• Production: PVGIS v5.2 with the PVGIS-NSRDB radiation database, 1,385 kWh/kW for a five-point cluster around South Carolina’s largest metro, then the 90% real-roof factor; the assumptions, the ERA5 cross-check and the attribution are on the methodology page .
• Incentives: DSIRE — Database of State Incentives for Renewables & Efficiency, NC Clean Energy Technology Center. Verify current amounts and fund status before relying on them.
• Federal credit status: IRS, Residential Clean Energy Credit . See our 2026 energy tax credit guide .
• Payback model: shared with the solar savings calculator — 2.5%/yr utility inflation, 0.5%/yr degradation, federal credit $0.

South Carolina’s rate (15.5¢, EIA Table 5.6.A, July 2026 data (released Sep 2026)), export regime, production factor, installed cost and programs were last verified on 25 September 2026; South Carolina’s export credit resets on its tariff cycle and incentive budgets run out mid-year, so confirm current terms before acting. Not tax or financial advice.

Frequently asked questions

How we calculated this

Worked for South Carolina: 8 kW × 1,000 × $2.61/W = $20,880 gross (federal credit $0, so net before state incentives); 9,972 kWh a year × the blended kWh value at 15.5¢ retail and 4.6¢ export ≈ $895 year-1 saving; payback ≈ $20,880 ÷ $895 = 22.6 years with 2.5%/yr rate growth, 0.5%/yr degradation and one inverter replacement in the 25-year model.

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

States with a comparable tariff picture

• Why is my electric bill so high? — Splits a bill jump into weather, rate and usage — with South Carolina’s own EIA rate history built in.
• Time-of-use rate simulator — Duke Energy Carolinas’s Schedule RSTC — Residential Service: Time of Use with Critical Peak Pricing schedule is preset from its own tariff sheet — see whether off-peak pricing beats your flat rate.
• Electricity rate tracker — South Carolina’s last 24 months of EIA rates, charted against the US average.
• Find your rate by ZIP — South Carolina averages hide utility gaps — look yours up from EIA-861 in three clicks.
• Net metering by state (2026 table) — Every state’s export regime with program, date and source — the rule behind South Carolina’s payback.
• Solar panel cost in Arizona — Same export regime at 15.4¢/kWh and a 16.9-year payback — the closest tariff comparison to South Carolina.
• Solar panel cost in Kansas — Same export regime at 15.3¢/kWh and a 22.1-year payback — the closest tariff comparison to South Carolina.
• Solar panel cost in West Virginia — Same export regime at 15.8¢/kWh and a 20.6-year payback — the closest tariff comparison to South Carolina.