South Carolina Solar Incentives, Net Metering, and Costs (2026)
South Carolina is one of the rare states with a meaningful state income tax credit for solar, but your real savings still depend on utility rules and how exported power is credited. This guide explains what incentives are valid, how net metering works by utility, typical costs, and how to size a system for realistic payback.
Is solar worth it in South Carolina?
Solar can be worth it in South Carolina when your roof gets good sun, you use a meaningful share of power during the day, and your quote uses realistic export-credit assumptions. Your utility territory matters too: net metering and rider options vary across investor-owned utilities, co-ops, and municipal providers.
The fastest way to sanity-check any proposal is to ask what it assumes for (1) credit eligibility and timing and (2) export credit value.
South Carolina solar incentives in 2026
Federal Residential Clean Energy Credit (solar tax credit): validity and deadline
The IRS currently states the federal Residential Clean Energy Credit is 30% for qualifying clean energy property installed from 2022 through December 31, 2025, and that it is not available for property placed in service after December 31, 2025.
What this means in plain English (2026 homeowners):
- •If your system is installed and placed in service in 2026, you should not assume you'll qualify for the federal credit under the current IRS wording.
- •If your system was placed in service in 2025, you may still claim it when you file that 2025 tax return in 2026 (if you meet all requirements).
- •The 2025 Form 5695 instructions also emphasize termination after December 31, 2025.
South Carolina Solar Energy Credit: validity, amount, and key rules
South Carolina's Solar Energy Credit is described by the South Carolina Department of Revenue as 25% of eligible costs incurred for purchase and installation. The credit allowed in a tax year is limited to the lesser of $3,500 per facility or 50% of your tax liability, and unused amounts can be carried forward up to 10 years.
Two eligibility rules that trip people up:
- •Leased solar systems do not qualify (ownership matters).
- •You generally claim the credit after installation is completed, and you can include eligible expenses incurred in a prior year if the install completes later.
Federal vs South Carolina credit validity at a glance
| Incentive | What it is | Current validity signal | Key gotcha to watch |
|---|---|---|---|
| Federal Residential Clean Energy Credit | Federal income tax credit for qualifying solar (and eligible storage) costs | IRS says 30% through Dec 31, 2025; not available for property placed in service after Dec 31, 2025 | Placed in service timing and tax liability/carryforward rules |
| SC Solar Energy Credit | SC income tax credit equal to 25% of eligible costs | SCDOR guidance describes the credit and how to claim; no ending date is stated in the cited guidance | Must own the system; annual limit; nonrefundable; carryforward rules |
What solar costs in South Carolina
Costs vary a lot by roof and electrical scope, so treat numbers as planning ranges, not promises.
Typical installed cost planning ranges (before incentives)
| System size | Often fits | Planning cost range |
|---|---|---|
| 5 kW | smaller usage, limited roof area | $12,000–$20,000 |
| 7.5 kW | many average-usage homes | $17,000–$30,000 |
| 10 kW | higher usage / EV or heat pump | $23,000–$40,000 |
Common adders that change quotes: main panel upgrades, service upgrades, roof replacement, complex rooflines, trenching for detached structures, and batteries.
Net metering and solar compensation in South Carolina
South Carolina net metering is not one-size-fits-all. The ORS status report confirms that net metering implementation is tracked for the major investor-owned utilities and reflects ongoing program administration through filings and oversight.
Dominion Energy South Carolina: where to verify your net metering rider
Dominion publishes official rates and tariffs resources and rider documents for South Carolina customers. These riders can include net metering terms and, for some customers/eras, incentive structures such as performance-based incentives tied to net metering participation.
Homeowner tip: Ask your installer to identify the exact Dominion rider/tariff name used in their savings model, then match it to the utility's published tariff documents.
Duke Energy in South Carolina: transition and tariff verification
Some Duke web pages may block access in certain environments, so the most reliable verification pathway is often the South Carolina PSC eTariff system and related commission filings for the specific rider/tariff your quote references.
Example: net metering bill math (illustrative)
Example (illustrative): Your home uses 1,000 kWh in July. Your solar produces 1,200 kWh. If you self-use 400 kWh while the sun is shining, you still need 600 kWh from the grid, and you export 800 kWh. Your bill outcome depends on how your tariff credits exported energy and what fixed charges still apply. That's why export credit value is one of the biggest drivers of real savings in South Carolina.
South Carolina production and roof considerations
South Carolina's long cooling season can align well with solar output, since production tends to be strongest when air conditioning use is high. Roof shading from mature trees can reduce output materially, and coastal/windy areas should prioritize equipment and racking designed for local weather exposure.
Sizing your system in South Carolina
Start with the last 12 months of kWh usage from your utility bills, then set an offset target (often 70%–100% for many households). Final sizing should account for roof constraints and how your tariff values exports.
Example: kWh → kW starting point (illustrative)
Example (illustrative): If your household used 12,000 kWh last year, your starting production target might be close to 12,000 kWh/year (if your roof and tariff support that). Your installer should then show how roof direction, shading, and export-credit assumptions change the recommended size.
Permitting and interconnection
Most projects follow this sequence: site survey → design → permitting → install → inspection → utility paperwork → meter change/approval → Permission to Operate.
Example: interconnection timeline (illustrative)
Example (illustrative): Many homes can be installed in 1–2 days once permits are issued, but reaching PTO often takes several weeks or longer depending on permitting turnaround, inspection availability, and utility review steps.
Equipment choices that matter in South Carolina
Microinverters or optimizers can help if your roof has shade or multiple roof planes, while string inverters can be cost-effective on clean, unshaded roofs. Batteries are often most valuable for outage resilience (storms) and keeping critical loads running, but they can lengthen payback compared to solar-only—so decide whether your priority is backup power or fastest ROI.
How to choose an installer and compare quotes
A trustworthy South Carolina quote should clearly state:
- •Whether the proposal assumes you qualify for the federal credit and what placed in service date it assumes.
- •How it models the South Carolina Solar Energy Credit (25% calculation, annual limit, carryforward) and confirms that the system is owned (not leased).
- •The exact utility tariff/rider used for export credits (Dominion/Duke/etc.) and where you can verify it in official documents.
Example: quote comparison trap (illustrative)
Example (illustrative): Quote A shows higher year 1 savings because it assumes a federal credit for a 2026 install and assumes exported energy is credited at a very high value. Quote B shows lower savings but does not assume a federal credit after 2025 (per current IRS language) and ties export value to a specific tariff document you can verify. The safer quote is usually the one with assumptions you can confirm.
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Next step
Get 2–3 quotes and insist on written assumptions about (1) credit validity and timing, (2) state credit eligibility (owned vs leased), and (3) the exact utility tariff/rider used for export credits.
References
- IRS — Residential Clean Energy Credit
- IRS — Instructions for Form 5695 (2025)
- South Carolina Department of Revenue — SC Revenue Ruling #24-2 (Solar Energy Credit FAQ PDF)
- South Carolina Legislature Online — 2025 Status Report on DER and Net Energy Metering Implementation (ORS PDF)
- Dominion Energy South Carolina — Rates and Tariffs
- Dominion Energy South Carolina — Rider to Retail Rates: Net Energy Metering for Renewable Energy Facilities (PBI PDF)
- South Carolina PSC eTariff System — Duke Energy Carolinas organization listing
- South Carolina PSC DMS — Duke letter filing NEM transition tariffs (PDF)