Commercial solar across South Carolina

What changed in South Carolina, and why older advice is wrong

Three things moved in sequence, and together they reset the arithmetic. One-for-one net metering closed to new applicants on 1 June 2021. Full-retail grandfathering for customers who applied before 16 May 2019 ran out on 31 December 2025. And the federal residential credit expired for systems placed in service on or after 1 January 2026.

The practical result is that payback in South Carolina is longer than the figures still published on national comparison sites, which mostly have not been updated. If you are working from an article that applies a 30% federal credit, the net cost it shows you is wrong by thousands of dollars. It is the first thing to check on anything you read, including a quote.

What did not change is the 25% South Carolina state credit on Form TC-38, capped at $3,500 in any one tax year and at 50% of your state liability, with a ten-year carry-forward. Because of that annual cap, most residential systems are claimed across two or three returns rather than recovered at once. Confirm your own eligibility with a tax professional.

None of this makes solar a bad decision here. It makes it a decision that has to be worked rather than assumed, and one where which utility bills you now matters more than it ever has.

Why the 2026 changes hit commercial less hard

The rate changes that made residential solar harder to justify left commercial economics broadly intact, and in relative terms improved them. The reason is load shape. A business draws hardest during the hours a rooftop array produces hardest, so most of what a commercial system generates never touches the grid.

That means a commercial building offsets power at full retail rather than earning a few cents for export, which under current terms is a structural advantage over a typical home. Where a residential system is increasingly a self-consumption exercise that has to be engineered, a commercial one often gets there by default.

It also means the variables that decide a commercial project are different. Demand charges, tax position, building ownership and remaining lease term matter more than roof orientation, and a projection that treats a commercial bill as a single consumption number is not modelling your bill.

What stops commercial projects

Structural capacity, which has to be established rather than assumed, particularly on older buildings and anything with a long clear span. It is an engineering assessment and it is cheaper to do early than to design around a number that turns out to be wrong.

Electrical service capacity. A system interconnects to your existing service, and where that service is near capacity the upgrade can be significant enough to change whether the project proceeds.

Roof condition, membrane type and any existing roof warranty. Attachment method follows membrane, existing rooftop plant takes space a satellite image makes look available, and installing under a warranty can affect it depending on terms.

And occupancy. A business leasing its premises on a short remaining term has a genuinely different decision from one that owns its building outright, and no amount of good roof orientation changes that. It is the question that most often changes our recommendation.

How to use these pages

Start with your town rather than the state. Every page below is grouped by the utility that serves it, because that is the variable doing the most work, and a statewide average is a number that applies to nobody in particular.

Then check the assumption behind any figure you are comparing. Two quotes for a similar system can differ enormously on their twenty-five year totals purely because of what each assumed about export credits and rate escalation, and neither assumption is usually stated on the front page.

If your town is not listed, it is worth asking rather than assuming we do not cover it. We install statewide from a Daniel Island office, and the page list reflects where we have enough verified local detail to publish something useful rather than the limit of where we work.

What we need to give you a real number

Twelve months of electricity usage. Not one bill, twelve. A system sized from a summer peak is oversized for the year and one sized from a mild month disappoints every August, and neither error is visible until the system is on the roof. Twelve months also shows us the shape of your consumption across the day, which is what determines how much of your own production you will actually use rather than export.

Confirmation of who serves your meter, read off the bill rather than inferred from your address. In the Charleston metro especially, territory boundaries run between streets, and modelling the wrong provider produces a confident answer to the wrong question.

Some idea of your roof: its age, its covering, and whether anything has grown up around it since you moved in. Roof age is the detail that most often changes our recommendation, because installing over a roof with a few years left means paying to remove and reinstall the array later.

And your own horizon. A household planning to move within a few years is making a resale decision rather than a payback decision, and those are different questions with genuinely different answers. Telling us early saves everyone a survey.

With those four things we can give you figures rather than a projection built on averages. Without them, anyone quoting you a payback period is guessing with a straight face.

Common questions

Is commercial solar still worth it after the 2026 changes?

Broadly yes, and in relative terms the case improved. Businesses draw hardest during the hours an array produces hardest, so most generation never touches the grid and is offset at full retail rather than earning a few cents for export.

What decides a commercial solar project?

Demand charges, tax position, building ownership and remaining lease term, usually more than roof orientation. Any projection treating a commercial bill as a single consumption number is not modelling your bill.

Can I install solar on a leased building?

Sometimes, but the remaining lease term usually decides it and it needs the landlord’s agreement. It is the question that most often changes our recommendation, so it is better raised early.

What usually stops a commercial project?

Structural capacity that has to be established rather than assumed, electrical service capacity where an upgrade becomes a large line item, roof condition and warranty terms, and short remaining lease term.

Do you handle the tax structuring?

No. We route tax structuring to your CPA rather than guessing at it, because it depends on your business’s specific position.