Top Commercial Solar Companies in the USA

Commercial PV systems install for $1.80–$2.50 per watt for rooftop projects above 100 kW and below $1.50 per watt for ground-mount projects above 1 MW. A 250 kW commercial rooftop typically costs $450,000–$625,000 all-in before incentives. Pricing varies substantially with roof type (membrane, ballasted vs penetrating racking, structural reinforcement requirements), site conditions (ground-mount soil and grading, distance to interconnection point), and equipment tier. Battery storage adds $400–$700 per kWh for commercial-scale lithium systems. Most commercial bids are structured around dollars-per-watt all-in, with a separate line for any battery and a separate O&M proposal — request that structure in every RFP response so you can compare apples to apples.

The Section 48E commercial Investment Tax Credit covers 30% of installed cost for projects that begin construction by July 4, 2026 under the OBBB Act, with up to four bonus adders that can stack: Domestic Content (+10% if a sufficient percentage of components are US-made), Energy Community (+10% if sited in qualifying brownfield or fossil-fuel-transition communities), and Low-Income Community (+10% to +20% depending on the program tier). A qualifying project can stack to 40–60% total federal credit. Direct-pay options under the Inflation Reduction Act also let tax-exempt entities — nonprofits, municipalities, schools, tribes, and rural cooperatives — monetize 48E even without tax liability. Confirm Prevailing Wage and Apprenticeship compliance with your EPC to capture the full base credit.

A typical mid-size commercial project (250 kW–1 MW) takes 4–9 months from contract to commercial operation: 1–2 months of engineering and structural review, 1–3 months for utility interconnection study and agreement, 1–2 months for permitting and AHJ review, and 1–3 months of installation and commissioning depending on project size and crew availability. Larger projects (5–25 MW) extend to 12–18 months because of longer interconnection studies, more complex structural and geotechnical reviews, and equipment lead times for switchgear, transformers, and inverters that can run 30–52 weeks in tight supply cycles. Build a 20% schedule contingency into any commercial project plan.

Size your system to offset 70–100% of annual kilowatt-hour usage, capped by available roof or ground area. A 100 kW rooftop covers roughly 8,000–10,000 square feet of usable surface depending on row spacing and HVAC obstructions. The right way to size is a 12-month load analysis using your utility interval data (most utilities provide a Green Button download). That analysis reveals seasonal load patterns, peak demand windows, and how much production your roof can actually offset versus what you would export at lower compensation. Avoid bidders who size systems based on annual kWh alone without modeling time-of-use rates — under modern commercial tariffs, the difference between a well-sized and oversized system is significant.

Owner-occupied commercial solar typically pays back in 4–7 years when the 48E credit, MACRS five-year accelerated depreciation, and state incentives stack on a well-designed system. SREC states (New Jersey, Massachusetts, Illinois, Maryland, Pennsylvania, Washington DC) often see 3–5 year payback because SREC revenue is layered on top of avoided-cost savings. After payback, 20+ years of essentially free electricity follow with minimal maintenance — the system continues to produce, MACRS depreciation has been captured, and the credit has been monetized. For PPA-financed projects, the host pays nothing upfront but captures a smaller share of the lifetime savings (typically 10–20% reduction off retail rates).

Yes — commercial solar leases, Power Purchase Agreements (PPAs), and Energy Service Company (ESCO) arrangements are common and well-suited to organizations that cannot directly use tax credits, including nonprofits, municipalities, schools, religious organizations, and many federal and state entities. Under a PPA, you pay the system owner a per-kWh rate (typically 10–20% below retail) for the energy the system produces; the system owner claims 48E and MACRS. Direct-pay options under the Inflation Reduction Act now let tax-exempt entities monetize 48E themselves, often making owner-financed deals more attractive than they were before. Compare PPA pricing against owned-system economics carefully — escalators above 2.5% annually significantly erode 20-year savings.

Commercial PV projects typically require a building permit, structural review (mandatory on older roofs or unusual roof types), an electrical permit, a fire-department setback and rapid-shutdown review, a utility interconnection study and signed agreement, and — for ground-mount or large rooftop — site plan review and zoning approval. Stormwater management permits and environmental reviews may apply to ground-mount projects on graded land. Authority Having Jurisdiction (AHJ) requirements vary substantially by city and county, and a reputable EPC will list every required permit in the project schedule before signing. Permitting in dense metros and slow AHJs can extend total project timelines by 60–90 days, so confirm AHJ familiarity with your EPC.

Browse our directory filtered to Commercial Solar in your state, then sort by review count. Look for EPCs with at least one in-house NABCEP-certified designer, OSHA 30 compliance for crew leads, SEIA Code of Ethics designation, $2M+ general liability insurance plus workers' compensation, and documented experience with projects similar in size and complexity to yours. Request three written proposals before signing — and require each to include itemized equipment, production estimates, financing terms, O&M scope, and reference projects of similar scale. Use Get Matched to receive competitive proposals from vetted commercial EPCs in your state at no cost.