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OneWorld Solar
1.267 MW rooftop solar array installed by OneWorld Solar on the Samsonite and TUMI distribution center in Vidalia, Georgia

Commercial solar service

Commercial Solar EPC Contractor for the Southeast

One contract, one accountable party: engineering, procurement, construction, interconnection and commissioning for commercial solar arrays from 100 kW to multi-megawatt.
Reviewed by Chris Sandifer, PE
  • Single-contract responsibility from feasibility study to utility witness test
  • PE-stamped drawings in six states, sealed in-house rather than subcontracted
  • Patented racking developed and owned by OneWorld Solar
  • 7.8+ MW built for commercial and agricultural clients since 2017

OneWorld Solar is a commercial solar EPC contractor working across Georgia, Florida, South Carolina, North Carolina and the Caribbean. We take a single contract for the whole job — feasibility, engineering, procurement, construction, interconnection and commissioning — so there is one company accountable for the number on the proposal and one company to call when something needs answering.

The business was founded in 2001, which makes it the oldest solar company in the Southeast. Doug Baird acquired it in October 2017 and rebuilt it around large commercial and agricultural clients. Since then we have installed more than 7.8 MW for commercial solar and battery customers, and we hold patents on our own solar racking awarded in 2020 and 2025.

What is included in a OneWorld Solar EPC contract?

Split-responsibility solar projects fail in the gaps between the parties. Ours does not have gaps, because the scope below is one contract with one price.

  • Feasibility and energy analysis. We read twelve months of your utility bills — not just the total, but the rate schedule, the demand charges, the power factor penalty and the time-of-use structure. That determines whether solar alone, solar plus battery storage, or power factor correction first is actually the right investment.
  • Engineering and stamped drawings. Structural, electrical and civil design, sealed by a Professional Engineer licensed in your state.
  • Utility interconnection. Application package, single-line diagram, technical data, the study process, and the witness test at the end.
  • Procurement. Modules, inverters, racking, combiners, transformers and switchgear, bought and warranted through us.
  • Construction. Our crews and our own patented racking, with the roof penetration details and flashing done to the roof manufacturer's warranty requirements.
  • Commissioning and monitoring. Performance testing, as-builts, O&M documentation and production monitoring handed over at the end.
  • Incentive documentation. The evidence packages your accountant needs for the 30% federal investment tax credit, Section 179 and bonus depreciation, and — for rural and agricultural sites — the USDA REAP grant.

How much does commercial solar cost?

Installed cost per watt falls as system size rises, and the difference between a 150 kW array and a 1 MW array is substantial. The variables that actually move the number on a commercial project are roof condition and attachment method, the distance from the array to the point of interconnection, whether the utility requires a transformer or protective relaying upgrade, and whether storage is included.

We publish real per-kW ranges and the assumptions behind them in how much commercial solar costs per kW in Georgia, and the commercial solar savings calculator will give you a system size, an annual saving and a payback range from your monthly bill in about a minute.

What we will not do

We will not quote a system from a satellite photo and an average bill. If the utility tariff, the roof and the interconnection point have not been looked at, the payback number is a guess — and a guess that is wrong by eighteen months is worse than no number at all.

Who does the engineering?

Chris Sandifer, our VP of Engineering, has been building medium- and high-voltage interconnections for utility-scale renewable generation since 1992. He is a Professional Engineer licensed in South Carolina, North Carolina, Florida, Georgia, Virginia and Texas, a NABCEP board-certified Photovoltaic System Inspector, and a North Carolina Licensed Electrical Contractor with the Unlimited Classification.

That matters for two reasons. Engineering is done in-house rather than farmed out to whoever is cheapest that month, so the person who sealed the drawing is the person who answers the utility's review comments. And a PE who vets sites for interconnection compatibility and congestion constraints before the design starts will tell you early if a site is going to be a problem — which is far cheaper than finding out during the utility study.

What does the process look like?

  1. Bill analysis and site walk — usually one to two weeks. You send twelve months of bills; we walk the roof or the ground area and check the service entrance.
  2. Proposal — system size, production model, installed cost, applicable incentives, cash-flow model and payback range.
  3. Contract and engineering — stamped drawings and the permit set.
  4. Interconnection application — filed as soon as the design supports it, because the utility queue is usually the longest pole in the schedule.
  5. Procurement and construction.
  6. Inspection, witness test, energization.
  7. Monitoring and O&M — with the production data available to you, not just to us.

Where we have built

1.267 MW

Samsonite / TUMI, Vidalia GA

Rooftop solar plus 55,000 lb of battery storage — our largest single site.

4.8+ MW

U.S. poultry installations

Breeder and broiler houses across the Southeast.

1 MW+

Woody Folsom Automotive

Chevrolet, Ford and Chrysler Dodge dealerships.

Beyond those we have built for the Westin Dawn Beach Resort in St. Maarten (800 kW), the Virgin Islands Port Authority (451.5 kW), Valencia College in Orlando (102 kW), Swainsboro Supply Company (117 kW) and the Orlando Utilities Commission. Browse all commercial solar projects or start with the industry closest to yours: poultry and agriculture, car dealerships, hotels and resorts, or manufacturing and warehousing.

Do you work in my state?

We are headquartered in Vidalia, Georgia and build across the Southeast and the Caribbean:

Reviewed by Chris Sandifer, PE

commercial solar EPC contractor

Frequently asked questions

What does EPC mean for a commercial solar project?

EPC stands for engineering, procurement and construction. An EPC contractor signs one contract covering the entire project: system design and stamped engineering, buying the modules, inverters, racking and switchgear, building the array, and getting it energized and accepted by the utility. The alternative is hiring an engineer, a supplier and an electrical contractor separately and coordinating them yourself, which is where most commercial solar schedules slip.

How long does a commercial solar installation take?

For a 250 kW to 1 MW commercial array in the Southeast, plan on four to nine months from signed contract to energization. Roughly six to twelve weeks of that is engineering, permitting and the utility interconnection study, which runs in parallel with equipment procurement. Construction itself is usually the shortest phase. Utility interconnection queues and, on larger projects, transformer lead times are the two variables most likely to move the date.

What size commercial solar systems does OneWorld Solar build?

Our commercial work typically runs from about 100 kW to just over 1 MW on a single site, and we have built more than 7.8 MW in total. The largest single array to date is the 1.267 MW rooftop system at the Samsonite and TUMI distribution center in Vidalia, Georgia, paired with 55,000 lb of battery storage.

Do you handle the utility interconnection application?

Yes. Interconnection is part of the EPC scope, not an extra. Our VP of Engineering, Chris Sandifer, has been designing medium- and high-voltage interconnections since 1992 and is a licensed Professional Engineer in South Carolina, North Carolina, Florida, Georgia, Virginia and Texas. We prepare the single-line diagram, the technical data package and the application, and we work the utility review through to the witness test.

Can you install solar on an existing roof, or does it need replacing?

Most commercial roofs can take solar as-is, but the remaining roof life matters more than the roof type. A 25-year solar array on a metal roof with eight years left is a decision to remove and reinstall the array later at your cost. We assess the roof during the feasibility study and will tell you plainly if a ground mount or a canopy is the better structure for your site.

Related

Keep reading

Find out what solar would do to your power bill

Send us twelve months of utility bills and we will come back with a system size, a cost, the incentives you qualify for and a payback range — at no charge.