Two homes ten miles apart in Horry County can end up with different solar payback timelines simply because one sits on Dominion Energy’s grid and the other sits on Santee Cooper’s. The Dominion Energy vs Santee Cooper solar buyback comparison isn’t a minor footnote in your solar quote, it’s one of the biggest variables in how fast your system pays for itself, because the two utilities credit exported solar power differently.
Key Takeaways
- Dominion Energy credits at retail rate: exported kilowatt-hours generally offset your bill dollar-for-dollar under South Carolina’s net metering framework.
- Santee Cooper uses its own tariff structure: as a state-owned utility not regulated by the Public Service Commission, it sets its own solar buyback terms, which can differ from investor-owned utility rates.
- Territory determines your utility, not preference: Dominion mainly serves parts of the Grand Strand, Pee Dee, and coastal counties, while Santee Cooper covers large swaths of the Lowcountry and central SC directly or through member cooperatives.
- Payback timelines can shift by a year or more: a lower buyback credit means your system needs to be sized and used differently to hit the same break-even point.
- Federal and state tax credits apply regardless of utility: the 30% federal credit and South Carolina’s additional state credit stack on top of either buyback structure.
At a Glance: Dominion Energy vs Santee Cooper Solar Buyback
| Factor | Dominion Energy | Santee Cooper |
|---|---|---|
| Regulatory oversight | South Carolina Public Service Commission | Self-governed, state-owned utility |
| Buyback structure | Net metering at retail rate | Utility-set tariff, avoided-cost leaning |
| Billing cycle for credits | Monthly netting, annual true-up | Monthly netting, terms vary by tariff version |
| Primary service areas | Horry, Georgetown, Berkeley counties | Coastal and central SC, plus co-op members |
| Interconnection review | Typically 4-8 weeks | Often 4-10 weeks, varies by system size |
| Applies to federal/state credits | Yes, independent of buyback rate | Yes, independent of buyback rate |
How Net Metering Works in South Carolina
South Carolina’s net metering rules give homeowners credit for solar power they send back to the grid, but the state framework leaves room for each utility to structure its own tariff. That’s the root of the confusion. A neighbor’s solar quote from a different zip code can look completely different from yours, and it usually comes down to which utility sits behind the meter, not the equipment on the roof.
Both Dominion Energy and Santee Cooper participate in net metering, but the mechanics differ enough that the same 8-kilowatt system can produce noticeably different savings depending on which grid it feeds. This matters more than most homeowners realize when they’re comparing quotes, because an installer modeling your savings needs to use the right utility rate, not a generic statewide average.
If you want the full picture on tax incentives that apply no matter which utility serves your home, our guide to 2026 solar tax credits and incentives breaks down what qualifies at the federal and state level.
Dominion Energy Solar Buyback: How Credits Work
Dominion Energy customers in South Carolina, largely concentrated around the Grand Strand and Pee Dee region, get credited for excess solar generation at close to the retail electricity rate under the state’s net metering rules. In practice, that means the kilowatt-hours your panels send to the grid during a sunny afternoon offset the kilowatt-hours you pull back at night at nearly a one-to-one ratio.
Credits accumulate on your monthly bill, and unused credits typically roll forward, with an annual true-up period where any remaining balance is settled. Because the buyback rate tracks close to what you’d otherwise pay for grid power, Dominion territory tends to produce more predictable, faster paybacks for a correctly sized system.
Homeowners in Myrtle Beach and the surrounding Horry County area often ask how this affects other electrical projects on the property. If you’re also weighing an EV charger, our EV charger installation guide for Myrtle Beach covers panel capacity and permitting steps that overlap with a solar project.
Santee Cooper Solar Buyback: How Credits Work
Santee Cooper operates differently from Dominion in one important way: it’s a state-owned utility, not regulated by the South Carolina Public Service Commission. That gives Santee Cooper more latitude to set its own net metering tariff terms, rather than following the same retail-rate framework applied to investor-owned utilities.
In practical terms, Santee Cooper’s solar buyback credit can lean closer to an avoided-cost structure in some tariff versions, meaning the rate paid for exported power may sit below the rate you pay to pull power from the grid. The gap between those two numbers is exactly what changes your payback math. It’s also worth noting that many Santee Cooper customers are actually served through member cooperatives, which can add another layer of tariff variation depending on your specific co-op.
Interconnection paperwork and approval timelines also differ slightly from Dominion’s process. If your home falls in Santee Cooper territory, our detailed breakdown of Santee Cooper solar interconnection requirements walks through the permitting and utility review steps you’ll need to plan around before your system gets permission to operate.
Dominion Energy vs Santee Cooper Solar Buyback: Side-by-Side Comparison
Here’s the comparison laid out in more detail, focused on the factors that actually move your savings numbers.
| Comparison Point | Dominion Energy | Santee Cooper |
|---|---|---|
| Credit rate for exported solar | Near retail rate | Often below retail rate |
| Rollover of unused credits | Yes, with annual true-up | Varies by tariff and co-op |
| Rate design stability | Set through PSC-approved rate cases | Set internally, can shift with board decisions |
| Best-suited system sizing strategy | Size closer to full annual usage | Size conservatively, consider battery pairing |
| Typical payback impact | Faster, more predictable | Slightly longer, more sensitive to usage timing |
Neither utility’s buyback rate is fixed forever. Rate cases and tariff reviews happen periodically, so a system you install this year should be evaluated against current terms, not assumptions carried over from a neighbor’s install several years ago.
How This Affects Your Solar Payback Timeline
A lower buyback credit doesn’t mean solar stops making sense in Santee Cooper territory, it means the math shifts. Homeowners on a lower export credit generally see the best results when their system is sized to match, or slightly undershoot, their own annual usage, rather than being oversized to sell excess power back at a lower rate.
Pairing a system with battery storage can also change the equation. Instead of exporting midday solar at a reduced credit, a battery lets you store that power and use it in the evening, effectively capturing full retail value for energy you’d otherwise sell back cheap. Our guide on home battery storage cost in 2026 covers what that pairing typically runs and what affects the price.
Whichever utility serves your home, the 30% federal solar tax credit and South Carolina’s additional 25% state credit apply the same way, since they’re tied to your system cost and tax liability, not your buyback rate. That combination often shortens payback by several years regardless of which grid you’re connected to. Details on eligibility live in our 2026 tax credit guide.
Which Utility Serves My Address in South Carolina?
Before an installer can model accurate savings, they need to confirm your exact utility. Dominion Energy generally serves the Grand Strand and northern coastal counties, including much of Horry and Georgetown, plus parts of Berkeley County. Santee Cooper serves large sections of the coastal and central Lowcountry directly, and also sells wholesale power to a network of electric cooperatives across the state, which then bill customers under their own retail tariffs.
The cleanest way to confirm which utility bills your home is checking a recent electric bill or asking a local installer to verify it against your address before quoting a system. This single detail changes the entire savings projection, so it’s worth confirming early rather than assuming based on your county alone.
What to Ask Your Solar Installer Before You Sign
Not every quote accounts for utility-specific buyback terms correctly. Before signing anything, ask your installer to show you the exact credit rate they used in your savings projection, and ask whether that number reflects your utility’s current tariff or an older, generic estimate.
- Ask which utility tariff version was used to calculate your payback estimate.
- Ask how the proposed system size was chosen relative to your annual usage and your utility’s buyback rate.
- Ask whether a battery would change your projected savings under your specific utility.
- Ask how long interconnection approval is expected to take for your utility and county.
For a fuller list of questions worth asking before you commit, see our guide on what to ask before signing a solar contract and the red flags to watch for when choosing an installer.
FAQ: Dominion and Santee Cooper Solar Buyback
Does Santee Cooper offer net metering?
Yes, but as a state-owned utility not regulated by the PSC, Santee Cooper sets its own net metering tariff terms, which can differ from the retail-rate structure used by investor-owned utilities like Dominion Energy.
Is Dominion’s buyback rate the same as the retail electricity rate?
It runs close to retail rate under current net metering rules, which is why homes on Dominion’s grid in South Carolina often see more predictable payback timelines for correctly sized systems.
Can I switch utilities to get a better solar buyback rate?
No. Your utility is determined by your address and existing service territory, not by preference. If you’re unsure which utility serves your home, check a recent bill or ask a local installer to confirm before you get a solar quote.
Do these buyback differences affect my eligibility for tax credits?
No. The federal 30% tax credit and South Carolina’s state credit are based on your system cost and tax situation, not on which utility buys back your excess solar power.
Comparing Dominion Energy vs Santee Cooper solar buyback rates before you sign anything is one of the smartest steps a South Carolina homeowner can take, since it directly shapes how your system should be sized and how fast it pays you back. If you want that comparison run against your actual address and utility, not a generic statewide estimate, get a free assessment from Sunburst Solar Solutions and see exactly what your buyback rate, system size, and payback timeline look like before you commit to anything.