Commercial solar
The federal tax math is the same for every commercial building — Section 48E plus depreciation. What changes is the load shape: warehouses and daytime-run plants are excellent roof-only candidates, while cold storage, breweries, and greenhouses usually need storage to capture real savings.
Updated June 30, 2026 · 10 min read
The same federal engine — Section 48E plus depreciation — applies to every commercial building type; what changes by industry is your load shape. Warehouses and daytime-loaded plants are excellent roof-only solar candidates. Cold storage, breweries, and greenhouses have round-the-clock or after-dark loads that solar alone can't fully offset and usually pair with battery storage. Want a building-specific read? Run yours through our commercial estimator.
The eligibility rules don't care whether you store frozen fish, brew lagers, or stage pallets. The economics do — because solar only makes power when the sun is up, and your business doesn't run on that schedule. This guide matches each common building type to its real solar fit and tells you which verticals need storage to make the numbers work.
Every commercial property runs on the same incentive: the Clean Electricity Investment Credit (Section 48E). It starts at a 6% base rate and rises to as much as 30% when prevailing-wage and apprenticeship requirements are met, with +10 percentage points for domestic content and +10 percentage points for energy-community siting (IRS — Clean Electricity Investment Credit). Most single-site rooftop arrays come in under 1 megawatt (AC), and a qualified facility with a maximum net output of less than one megawatt is eligible for the increased credit amount without satisfying the prevailing-wage and apprenticeship requirements (IRS — FAQs on prevailing wage and apprenticeship). On top of the credit, the federal government treats qualified clean-energy property placed in service after Dec. 31, 2024 as 5-year MACRS property (IRS — Cost recovery for qualified clean energy facilities), and the One Big Beautiful Bill Act restored 100% first-year bonus depreciation for qualified property acquired and placed in service after Jan. 19, 2025 (Grant Thornton — OBBBA and accelerated depreciation). Depreciation is available, but how it stacks with the credit is genuinely fiddly — confirm the recovery period and bonus treatment with your CPA.
There's a clock, though. For solar facilities, begin construction by July 4, 2026 to keep the longer placed-in-service window; projects that begin construction after that date must be placed in service by Dec. 31, 2027 to qualify (The Tax Adviser — Navigating safe-harbor rules for Sec. 48E facilities). How you establish "begin construction" is, as of mid-2026, in flux. The IRS tried to make the Physical Work Test the primary method and largely scrap the old 5% cost safe harbor for solar in Notice 2025-42 — but on June 6, 2026, a federal court vacated that notice in its entirety, restoring the 5% safe harbor alongside the Physical Work Test for wind and solar (Holland & Knight — Court Vacates IRS Notice 2025-42). The government is widely expected to appeal, so treat the begin-construction method as unsettled and lock down your approach with tax counsel rather than this article. See how the credit and timing work for the full walkthrough, and our deeper dive on the July 4, 2026 commercial solar deadline.
One thing to clear up so you don't confuse tracks: the residential credit (Section 25D) is gone in 2026. It is "not available for any property placed in service after December 31, 2025," even though the live IRS page still carries older boilerplate about the credit beginning to "phase out in 2033" (IRS — Residential Clean Energy Credit). That applies to homeowners — more in is there a solar tax credit in 2026?. The commercial 48E engine in this article is a different statute and it survived.
Solar panels make their power in a midday hump. So the question for any building isn't really "am I eligible?" — everyone runs the same 48E engine. The question is: how much of your electricity do you use while the sun is shining?
If your operation is daytime-heavy — forklifts, lighting, HVAC, single-shift production — your consumption curve overlaps neatly with the solar production curve, and a rooftop array can offset a large share of your bill directly. That's the roof-only sweet spot.
If your operation runs around the clock, or its biggest electrical loads fire after dark, solar trims the daytime slice but leaves the evening and overnight load untouched. Worse, many commercial bills carry demand charges based on your single highest 15-minute spike, and a midday solar array often does little to shave a 2 a.m. compressor surge. Those verticals need storage to chase off-peak load and flatten peaks. That's the lens for the table below.
| Industry | Typical load shape | Roof suitability | Daytime overlap | Storage usually needed? | Watch-outs |
|---|---|---|---|---|---|
| Warehouse / distribution | Daytime, modest intensity | Excellent (big flat roofs) | High | No | Often roof-area- or export-limited, not demand-limited |
| Cold storage / refrigerated warehouse | 24/7, refrigeration-driven | Good roof, but heavy load | Partial | Yes | Compressor demand spikes; overnight load |
| Brewery / craft beverage | Mixed; refrigeration-heavy + process heat | Good | Moderate–high | Often | PV won't touch gas-fired process heat |
| Greenhouse / controlled-environment ag | Varies enormously; lighting often beyond daylight | Glazing competes with panels | Low–moderate | Often | Ground-mount/canopy common; off-sun lighting |
| Light manufacturing | Single-shift, daytime | Good | High | Sometimes | Roof condition; demand-charge structure |
Verdicts are qualitative on purpose. A guaranteed savings percentage isn't possible before seeing your interval data — be wary of one offered without it, a pattern worth knowing alongside the other solar sales red flags.
This is the textbook fit. Big, flat, unshaded roofs; daytime loads from forklifts, lighting, and HVAC; and relatively modest energy intensity. EIA's commercial buildings survey puts warehouse and storage buildings at a mean energy intensity of 30.2 thousand Btu per square foot, with electricity the most-used fuel (EIA — CBECS: Warehouse and storage).
The main caveat is almost the opposite of a problem: because these buildings are low-intensity, they have enormous roof area relative to their load. Your array is frequently limited by roof space or by how much you're allowed to export back to the grid, rather than by your demand. That's a good problem to have, and it usually means a clean, strong economic case for roof-only solar.
Same building footprint, completely different answer. Refrigeration is the dominant electrical end use and it runs around the clock. As an industry benchmark drawing on CBECS data, the utility research firm E-Source reports refrigerated warehouses consume roughly 24.9 kWh per square foot per year versus about 6.1 kWh for non-refrigerated — roughly four times more — with refrigeration driving the majority of that load (E-Source — Business Energy Advisor: Warehouses). Treat that as a benchmark, not a guaranteed number for your building; CBECS itself combines refrigerated and non-refrigerated warehouses, so there's no single official "cold storage" figure.
Solar offsets the daytime portion of that load, but it doesn't run at night, and compressor cycling drives demand-charge spikes that a midday array can't shave. This is the clearest solar-plus-storage vertical in the whole guide. Batteries let you serve evening and overnight refrigeration and trim the demand peaks that often dominate a cold-storage bill.
Breweries have two distinct energy stories. On the electric side, refrigeration is the single largest end use — the EPA/LBNL ENERGY STAR brewery guide puts refrigeration at roughly 30–40% of brewery electricity use and compressed air at about 10% (EPA / LBNL — Energy Efficiency for Breweries). Solar handles daytime electric load well, and storage helps flatten the refrigeration demand peaks.
But the brewing itself runs on heat — boiling and steam — and that's typically gas-fired. Solar PV makes electricity, not steam, so it simply doesn't touch your process-heat costs. The upshot: PV is a strong fit for the electrical side of a brewery, with storage helping on refrigeration peaks, but don't expect it to dent the gas bill.
Greenhouses are the hardest vertical to generalize, and a single "average" figure won't tell you much. These facilities are very energy-intensive to light, heat, and cool, and consumption varies for each operation depending on size, construction, controls, lighting, crop, and goals (Cornell CALS — Energy Use & Savings in Greenhouses).
Two structural realities shape the solar answer. First, the roof glazing that lets light in is the same surface you'd otherwise cover with panels, so ground-mount or canopy arrays are common rather than rooftop. Second, supplemental grow lighting often runs well beyond daylight hours — extending the photoperiod into early morning and evening — which is poor overlap with solar production. For lighting-intensive operations, PV may be a partial fix at best without storage. Farm financing note: USDA REAP grant applications are paused in 2026 while the agency rewrites the rule, though guaranteed-loan applications are still being accepted (USDA Rural Development — REAP Guaranteed Loans). More on the agricultural angle is on our farm solar track and in why REAP grants are paused for farm solar in 2026.
Single-shift, daytime-loaded plants overlap well with solar production: you make power when you're running the line. These are generally good roof-only candidates, subject to the two things that decide most commercial projects — roof age and structural capacity, and how your utility structures demand charges. Some operations with sharp demand peaks benefit from storage, but many do fine roof-only.
There's no shortcut around your own data. A credible assessment does this:
The credit math is the same across every building; the load shape isn't. In one line each:
Same 48E engine, same depreciation, same July 4, 2026 clock — different answers, because your building doesn't run on the sun's schedule. Run your building through the commercial estimator to see where yours lands, and check the best states for solar for how local rates and incentives stack on top of the federal credit.
Educational content, not tax, financial, or legal advice. Figures are current as of the update date above; verify with a qualified professional before acting.
Yes — unlike the residential credit, the commercial Section 48E credit survived. It starts at a 6% base rate and rises to as much as 30% when prevailing-wage and apprenticeship rules are met (a qualified facility under 1 MW AC gets the higher rate without meeting those rules), with additional 10-percentage-point adders for domestic content and energy-community siting, plus depreciation. The catch is timing: begin construction by July 4, 2026 to keep the longer placed-in-service window. Actual savings depend on your load, roof, and utility rates.
Large, flat, unshaded roofs on daytime-loaded buildings are the best fit — classic warehouses and distribution centers, and single-shift light manufacturing. They produce power exactly when those buildings use it. Round-the-clock operations like cold storage, and refrigeration-heavy or off-sun-lit operations like breweries and greenhouses, can still use solar but typically need battery storage to capture meaningful savings.
It helps, but it rarely covers the whole load. Refrigeration is the dominant electrical end use in a cold-storage facility and runs 24/7, while solar only produces during the day. As an industry benchmark drawn from CBECS data, refrigerated warehouses use roughly four times the electricity per square foot of non-refrigerated ones (about 24.9 vs 6.1 kWh per square foot per year). Rooftop solar can offset the daytime slice, but you usually need battery storage to address evening and overnight refrigeration and to manage the demand charges that compressor spikes create. Treat cold storage as a solar-plus-storage decision, not solar alone.
Solar can cover a good share of a brewery's electricity — refrigeration alone is roughly 30–40% of brewery electricity use per the EPA/LBNL ENERGY STAR guide — but it does not address process heat. Boiling and steam are usually gas-fired, so solar PV won't touch them. PV is a strong fit for the electrical side, and storage helps flatten refrigeration demand peaks.
No new REAP grant applications are being accepted in 2026 — USDA announced in spring 2026 that it would pause grant awards while it rewrites the program rules. REAP guaranteed-loan applications are still being accepted, so financing through REAP loans remains an option for eligible rural and agricultural operations even though the grant path is closed for now.
Free, no obligation, and sourced from the IRS, USDA, and EIA.