Independent Solar Advisor • Updated July 2026

Solar Panels in
South Carolina

Not in South Carolina?

South Carolina holds the largest state solar tax credit left in America: 25% of system cost, claimable at up to $3,500 a year with a 10-year carryforward. When Washington's credit died in December 2025, Columbia's kept working. The other half of the story is newer: 2026 moved Palmetto State solar onto time-of-use Solar Choice rates that reward design and punish defaults. EcoGen America handles both halves.

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State Tax Credit 25%, Biggest Left in U.S.
How It Pays $3,500/Yr, 10-Yr Carryover
New for 2026 TOU Solar Choice Rates
Incentive Strength
Fair Price Range $2.55 – $3.25/W
About EcoGen America

In South Carolina, the Biggest State Credit Left Meets New Rates.

South Carolina holds the largest state solar tax credit left in America: 25% of system cost, claimable at up to $3,500 a year with a 10-year carryforward. When Washington’s credit died in December 2025, Columbia’s kept working.

The other half of the story is newer: 2026 moved Palmetto State solar onto time-of-use Solar Choice rates that reward deliberate design and punish defaults.

Together they change the shape of a good system: the credit does the heavy lifting on cost, and time-of-use design decides what the production is worth.

EcoGen America handles both halves, at typical pricing of $2.55 to $3.25 per watt.

Dean Mahmoud Written by Dean Mahmoud •  Last updated September 4, 2026
Our vetting process

Credit-Complete Estimates

The 25% credit pays out at $3,500 a year with carryforward. We model the real multi-year schedule instead of pretending it lands at once.

Quote Analysis

Built-in checks for Solar Choice time-of-use assumptions, credit math over the carryforward years, and design that fits the new rate windows.

Local Policy

We track the state credit rules, Duke and Dominion Solar Choice tariffs and the 2026 time-of-use transition.

Privacy First

Your data is only shared with the licensed South Carolina installers you choose.

Trevor Guilday
Reviewed by Trevor Guilday, founder of EcoGen America · LinkedIn
Trevor has worked in home improvement and residential solar since 2016 and maintains the EcoGen Solar Cost Index.

Collecting the 25%: How the Carryforward Actually Pays

The credit is generous and slow, by design. A worked example on a $20,000 system:

The Piece
The Number
What It Means
Total credit earned
$5,000 (25% of $20,000)
A full quarter of the system price returns via state taxes
Annual claim cap
$3,500 per tax year
The $5,000 arrives across two filings, not one
Carryforward window
10 years
Modest tax bills still collect everything eventually; patience is paid
Credit mechanics per South Carolina statute as of July 2026; your own tax liability sets the claim pace, model it with your preparer.

The design implication: South Carolina’s credit rewards owners who stay put and file patiently. Financing that ignores the multi-year cash timeline misprices the deal in both directions.

Claim, Schedule, Shape: The Palmetto Order

1

Claim

The 25% credit is the anchor; get the paperwork right and model the $3,500-a-year pace against your actual tax bill.

2

Schedule

Know your Solar Choice TOU windows cold. When power is expensive decides what your panels are worth.

3

Shape

Design to the schedule: orientation, load shifting, and storage where it pencils. TOU rewards the deliberate.

Want the credit and schedule modeled together?

Free 15-minute call. Carryforward pace, TOU windows, real total.

Book a South Carolina Consult

Solar Choice: Designing for the Time-of-Use Era

The 2026 transition put new Palmetto solar on time-varying rates. Winning under them is a known playbook:

  • Peak windows set the prize: production and self-consumption during expensive evening hours carry outsized value; the rate schedule belongs inside the design software, not just the bill.
  • West-facing capacity earns its second look, catching late-day sun when TOU prices spike, a genuine reversal of old south-only dogma.
  • Storage graduates from luxury to lever: shifting midday production into the peak window is exactly what TOU pays for.
  • Surplus still settles near avoided cost, so oversizing stays pointless; shaping beats sizing in the Solar Choice era.

Between the credit’s 25% and a schedule-aware design, South Carolina remains one of the Southeast’s strongest cases, it just stopped rewarding lazy quotes.

South Carolina Contract Checks

South Carolina Quotes: Four Palmetto Checks

A big credit plus new rates equals four careful reads.

Clause to verify: Ask for the year-by-year credit collection schedule based on your actual liability.
Clause to verify: Confirm the projection uses your actual TOU windows and shows peak-hour production explicitly.
Clause to verify: Compare production to usage and challenge overshoot; ask how the design serves the peak window.
Clause to verify: Strike any federal line; the state credit and TOU-aware design carry the case.
Verify your paperwork

Four checks, any Palmetto quote. Schedule-fluent installers pass them cold.

Check SC Price Fairness Model My Credit Timeline

South Carolina Installers Built for the TOU Era

Vetted for SC licensing, Duke and Dominion interconnection experience and complaint history.

Purelight Power

25-Yr Parts & Production 10-Yr Workmanship
Why Recommended
  • Leading installer in Oregon, Iowa and Montana by its own install count
  • First-year sold-production guarantee backs the estimate
  • Systems engineered for 130 mph wind and 50 mph hail
  • 10-year workmanship plus 25-year parts and production coverage
Warranty
25-yr parts & production warranty
Timeline
Quoted per project
Service Area
OR, MT, MN, NC, SC + more

Palmetto

25-Year Warranty 15-State Coverage
Why Recommended
  • 25-year panel and inverter warranties, with 10-year workmanship coverage
  • Operating since 2011 across 15 states, per the company's own locations page
  • Offers both ownership and third-party financing paths, which matters now that the federal homeowner credit has ended
Warranty
25-year panel and inverter, 10-year workmanship
Experience
15 Years
Service Area
15 states: AZ, CA, CO, FL, GA, IL, MA, NJ, NY, NC, OH, PA, SC, TX, VA

Renu Energy Solutions

NABCEP Certified Tesla Powerwall 3 Certified Enphase Platinum Installer
Why Recommended
  • Publishes its full license set rather than describing itself as licensed: SC General Contractor 119903 and SC Electrical Contractor CLM.113782.
  • NABCEP certified (090919-017323), the independent credential for solar installers.
  • Manufacturer certified across Tesla, Enphase, SolarEdge and Generac for battery and inverter work.
Service Area
North & South Carolina

When Palmetto Solar Should Pause

The cases to hold, even with the country’s best remaining credit:

  • Little state tax liability and no patience. The credit pays through your tax bill over years; households owing very little collect very slowly.
  • Quotes modeled on flat rates. Solar Choice is time-of-use; a schedule-blind projection is wrong from line one.
  • Short-horizon owners. The 10-year carryforward rewards staying; a quick sale strands unclaimed credit.
  • Coastal roofs without wind-rated specs. Hurricane exposure is real from Hilton Head to Myrtle Beach; the mounting engineering matters.
  • Heavily shaded lots. No credit percentage rescues production that never happens.

Tax-paying households planning to stay put: a quarter of the system back plus TOU-aware design makes South Carolina the Southeast’s standout, on paper and in practice.

South Carolina Solar, Credit and Clock

South Carolina Solar Panel Cost: 2026 Prices & Savings Guide
Cost

South Carolina Solar Panel Cost: 2026 Prices & Savings Guide
South Carolina Solar Incentives (2026): 25% State Tax Credit, Net Metering & Santee Cooper Rebate
Incentives

South Carolina Solar Incentives (2026): 25% State Tax Credit, Net Metering & Santee Cooper Rebate
Is Solar Worth It in South Carolina? The 2026 Numbers
Investment

Is Solar Worth It in South Carolina? The 2026 Numbers
Free Solar Panels in South Carolina? Guide to $0 Down Solar Offers in 2026
Programs

Free Solar Panels in South Carolina? Guide to $0 Down Solar Offers in 2026
South Carolina Solar Companies and the State Credit That Survived (2026)
Companies

South Carolina Solar Companies and the State Credit That Survived (2026)

1. Palmetto quote in hand?

Priced against the market band with the credit timeline and TOU schedule modeled.

OR

2. Want the credit pace computed first?

15 minutes, independent. Carryforward, TOU, verdict.

Talk to a South Carolina Advisor

No obligation. 100% free service.

South Carolina Solar FAQs

How does the South Carolina solar tax credit work?

It pays 25% of total system cost against your state taxes, capped at $3,500 per year, with unused credit carrying forward up to 10 years.

On a typical system the full quarter comes back across two or three filings, the most valuable state credit remaining in the country.

What is Solar Choice in South Carolina?

The successor rate structure for new Duke and Dominion solar customers: time-of-use pricing where power costs vary by hour and exported surplus settles near avoided cost.

Systems designed for the schedule, west-facing capacity, load shifting, storage where it pencils, keep strong economics.

Is solar worth it in South Carolina after the federal credit ended?

Yes, unusually so: the 25% state credit replaces most of what the federal credit did, and no other state offers anything close.

The projects that disappoint are schedule-blind designs and households with too little tax liability to collect at a satisfying pace.

What does Duke or Dominion pay for exported solar in SC?

Monthly surplus settles near avoided cost under Solar Choice, a few cents per kilowatt-hour, which makes oversizing pointless.

The value lives in self-consumption during expensive TOU windows, which is a design question your installer should answer explicitly.

Do coastal South Carolina homes need special solar equipment?

Wind-rated mounting and corrosion-aware hardware, yes: hurricane exposure runs the length of the coast.

Ask for the wind-load engineering in writing; established Palmetto installers provide it without friction.

References & Research Sources

The rates, program terms and figures on this page come from the records below. Sources accessed July 9, 2026.

  1. South Carolina General Assembly. South Carolina Code of Laws § 12-6-3587: Purchase and Installation of Solar Energy System for Heating Water, Space Heating, Air Cooling, or Generating Electricity. State solar energy income tax credit statute. The statute behind the 25 percent state credit this page leads with. Accessed July 9, 2026.
  2. South Carolina Department of Revenue. SC Schedule TC-38: Solar Energy, Small Hydropower System, or Geothermal Machinery and Equipment Credit. South Carolina income tax credit form and instructions. Revised March 28, 2022. The form and instructions behind the annual claim cap and the ten-year carryforward worked through on this page. Accessed July 9, 2026.
  3. South Carolina Office of Regulatory Staff (ORS). South Carolina Energy Freedom Act. Solar Choice and Energy Freedom Act consumer resource. The consumer resource behind the Solar Choice structure this page explains. Accessed July 9, 2026.
  4. Duke Energy Carolinas, LLC. Rider RSC (SC): Residential Solar Choice. South Carolina Third Revised Leaf No. 136; Public Service Commission of South Carolina Docket No. 2020-264-E, Order No. 2021-390. Effective January 1, 2026. The filed Solar Choice rider behind the time-of-use treatment of new Duke customers. Accessed July 9, 2026.
  5. Duke Energy Progress, LLC. Residential Solar Choice Rider RSC. South Carolina Second Revised Leaf No. 663; Public Service Commission of South Carolina Docket No. 2020-265-E, Order No. 2021-390. Effective January 1, 2026. The matching rider in the other Duke territory in South Carolina. Accessed July 9, 2026.
  6. Dominion Energy South Carolina, Inc. Rider to Residential Rate 5: Solar Choice for Renewable Energy Facilities. Residential solar choice rider for customer-generators. Effective for bills rendered on and after the first billing cycle of July 2026. The rider behind the Solar Choice terms for new Dominion customers. Accessed July 9, 2026.
  7. Dominion Energy South Carolina, Inc. Rate PR-1: Small Power Production, Cogeneration. Electric cogeneration and standby rate schedule for qualifying facilities. Effective for bills rendered on and after the first billing cycle of January 2026. The avoided-cost schedule behind the statement that surplus settles near avoided cost. Accessed July 9, 2026.
  8. Internal Revenue Service (IRS). Treasury, IRS Issue FAQs to Address the Accelerated Termination of Several Energy Provisions Under OBBB. Federal clean energy tax guidance. Published August 21, 2025. The guidance behind the December 2025 end of the federal credit this page says the state credit now stands without. Accessed July 9, 2026.
Dean Mahmoud
Written by
Chief Executive Officer

Dean Mahmoud is the CEO of EcoGen America. He has connected tens of thousands of homeowners with residential solar installers across all 50 states since 2021, and works directly with installation companies on solar pricing, financing, and what homeowners actually pay for rooftop solar.

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