Farm & rural
For most farms in 2026, the barn roof beats the field — USDA now disincentivizes REAP funding for solar on productive farmland and cut ground-mount over 50 kW out of the guaranteed-loan and grant-priority tracks. Here's how to site panels to protect your acres and your funding eligibility.
Updated June 30, 2026 · 11 min read
Put the panels on your barn or outbuilding roof first, on marginal or non-tillable ground second, and on prime tillable soil only as a last resort — designed as agrivoltaics. That's the answer for most farms in 2026, and the reason isn't aesthetics or even economics in the usual sense. It's that USDA spent 2025 rewriting which farm solar projects it will fund, and the dividing line it drew is about where you put the array, not which panels you buy.
In other words: siting is now the single highest-leverage decision a farm makes when going solar. Get it right and you stay onside with USDA's scoring and keep your best soil in production. Get it wrong — a big ground-mount on prime farmland — and you may have neither a grant path nor a loan-guarantee path, right as USDA stops rewarding that choice.
- Barn / outbuilding roof — safest on USDA's 2026 scoring, no tillable acres lost, near the load it powers. The default recommendation. (USDA)
- Marginal / non-tillable ground — the underused middle path; keeps tillable acres working and is far less likely to read as "solar on productive farmland."
- Prime-soil ground-mount — funding-disfavored in 2026. If unavoidable, design it as dual-use grazing (agrivoltaics) so the land keeps working. (DOE)
- Funding reality: REAP grants are paused in 2026; REAP guaranteed loans are still accepted year-round. (USDA Rural Development)
On August 19, 2025, USDA announced it "will no longer fund taxpayer dollars for solar panels on productive farmland," implementing the Secretary's direction to disincentivize solar panels on productive farmland in the Rural Energy for America Program (REAP). (USDA press release, Aug 19, 2025)
The mechanic underneath the headline is what matters for siting. Under the policy:
Read that carefully, because it tells you exactly what USDA is not targeting: roof-mounted systems, and right-sized systems whose output you can tie to documented on-farm electricity use. Those remain the favored path. The policy is aimed at large, speculative ground arrays on good soil — not at a farmer offsetting the barn's actual load.
There's a second piece that compounds the first. In 2026 USDA paused REAP grant applications, rescinding its prior REAP funding notice while it rewrites the program's regulations to comply with a federal executive order on energy subsidies; the agency has said it intends to issue a new funding notice once the new rules are in effect, and that applicants will have to reapply. But REAP guaranteed loan applications are still accepted year-round under the OneRD Guarantee rule. (USDA Rural Development — REAP guaranteed-loans page)
Stack those two facts together and the squeeze on ground-mount becomes clear. A large ground array on tillable land in 2026 has neither the grant path (paused for everyone, and no priority points for this configuration anyway) nor the loan-guarantee path (ineligible if over 50 kW or undocumented). A right-sized roof system tied to your meter still has the loan path.
One important caveat on what this is: the 50 kW threshold and the historical-energy-use documentation requirement are USDA agency direction and pending rulemaking, not a tax law or an act of Congress. The program is mid-rewrite. Treat the specifics as the current funding posture, confirm the live terms on USDA's site before you apply, and don't assume the exact numbers are frozen.
For most operations, this is where you start. The advantages line up cleanly with how USDA now scores projects:
Watch-outs. Roof age and condition matter — you don't want to mount a 25-year system on a roof with 8 years left. Orientation and shading affect output. And the structure has to carry the load: industry structural-design guidance generally treats rooftop solar as adding roughly 2–4 lb per square foot of dead load (panels plus racking), on top of which the roof still has to carry wind and snow. Newer metal roofs typically handle this easily; older barns should be assessed by a structural engineer before anything goes up. Treat "2–4 lb/sq ft" as a planning rule of thumb — the exact figure varies by panel and racking, and mounting points create concentrated loads at each attachment — and never assume your specific barn can hold it without a professional looking at it.
Sizing reality check. Before you decide the roof is too small, do the arithmetic. Ohio State University Extension's rule of thumb is that "a solar electric system will require 100 square feet of rooftop (or yard space) for every kilowatt (kW)." In OSU's worked example, a southern-Ohio swine and goat operation using about 32,460 kWh a year needed roughly 22.4 kW to offset about 90% of its usage — about 107 panels (250 W each) over roughly 1,883 square feet. (OSU Extension, Fact Sheet CDFS-4102)
A few thousand square feet of barn roof goes a long way. Note that the 100 sq ft/kW figure comes from an example using 250 W panels — modern higher-efficiency panels can need meaningfully less area for the same kilowatts, so a tight roof may still fit more than the rule suggests.
If the roof genuinely can't carry or fit the system you need, the next stop isn't your best field — it's the ground you'd never plant anyway. Odd corners, ditch banks, already-disturbed or brownfield ground, the strip that's too wet or too rocky for row crops: this is land that keeps your tillable acres in production while giving the array a home.
This middle path is underused, and it's well aligned with the USDA shift for a simple reason: it's far less likely to read as "solar on productive farmland." You're not converting prime soil. Two things to keep in mind even here: keep the system right-sized to the operation, and document the energy tie to your farm's actual load — the same documentation logic that protects a roof system protects a modest ground system on marginal land.
In 2026 this is the funding-disfavored path. On prime farmland you likely get no grant priority and, if the system is over 50 kW or can't document historical energy use, no REAP guaranteed-loan path either. (USDA, Aug 19, 2025)
If you still need ground-mount on working land, the move is to design it so the land keeps working — agrivoltaics. The U.S. Department of Energy defines agrivoltaics as "agriculture, such as crop production, livestock grazing, and pollinator habitat, located underneath solar panels and/or between rows of solar panels." Per DOE, over 4,000 megawatts of U.S. solar already include sheep grazing underneath, and facilities can be designed with increased row spacing to allow access with small tractors or other farm equipment. (DOE, Farmer's Guide to Going Solar)
The point: ground-mount removes land from row-crop use, but it does not necessarily remove it from agricultural use. Dual-use design keeps the acres productive and reads very differently from a static array fenced off on prime soil.
It's also worth keeping the aggregate picture in view. DOE estimates U.S. agricultural land has the technical potential for 27 terawatts of solar, and projects that only about 0.3% of farmland will be used for solar by 2035. (DOE) The nationwide farmland-loss concern is small in percentage terms — but USDA is tightening its own funding rules regardless, and that's the constraint your individual project actually faces.
| Siting option | Tillable acres affected | USDA REAP posture (2026) | Typical fit / scale | Key watch-out | Dual-use potential |
|---|---|---|---|---|---|
| Barn / outbuilding roof | None | Favored — not the target of the productive-farmland disincentive; documents load easily | Right-sized to building load (e.g. ~22 kW on a barn-roof example) | Roof age/condition + ~2–4 lb/sq ft dead load; structural engineer on older barns | N/A (no land used) |
| Marginal / non-tillable ground | None (keeps prime soil in production) | Generally favored if right-sized and documented; unlikely to read as "productive farmland" | Small-to-mid, tied to documented on-farm load | Still document energy tie; keep it right-sized | Pollinator habitat / light grazing on the parcel |
| Prime-farmland ground-mount | Takes prime soil out of row-crop use | Disfavored — no grant priority; no guaranteed-loan path if >50 kW or undocumented | Larger arrays | Funding-disfavored; converts your best soil | High — design as agrivoltaics (grazing / row spacing) to keep land agricultural |
Sources for the table: USDA press release, Aug 19, 2025; USDA Rural Development REAP guaranteed-loans page; OSU Extension CDFS-4102; DOE Farmer's Guide to Going Solar.
Run these in order. Each branch points you to a recommendation.
A few dollar specifics are mid-rulemaking or vary, so treat them as current posture rather than fixed:
For the bigger picture on what survived and what died across federal and state programs, see our 2026 solar incentives guide. If you want the plain-English version of the grant freeze specifically, read REAP grants paused in 2026. And if you're weighing the credit question for a home or farmhouse, here's whether there's a solar tax credit in 2026.
In 2026, the cheapest mistake to avoid is putting a big array on your best soil right as USDA stops rewarding it. Site the system on the barn roof if it can carry and fit what you need; reach for marginal, non-tillable ground before you ever touch prime acres; and if you genuinely need ground-mount on working land, design it as agrivoltaics so the land keeps producing. Roof-first protects both your tillable acres and your remaining funding eligibility — which, this year, are the same decision.
Start by sizing the system to the building you'd actually mount it on. Get a free, right-sized estimate for your farm — built from your real load and the structure you actually have. Curious how that estimate gets built? Here's how it works.
Educational content, not tax, financial, or legal advice. Figures are current as of the update date above; verify with a qualified professional before acting.
Not right now. USDA paused REAP grant applications in 2026, rescinding its prior funding notice while it rewrites the program's regulations to comply with a federal executive order on energy subsidies; the agency has said it intends to issue a new funding notice once the new rules are in effect, and applicants will need to reapply. REAP guaranteed loan applications, however, are still accepted year-round under the OneRD Guarantee rule. Source: USDA Rural Development REAP program page.
It depends heavily on siting and size. As of August 2025, USDA's stated direction is to disincentivize solar on productive farmland: ground-mount solar over 50 kW, or systems that cannot document historical on-farm energy use, are no longer eligible for the REAP Guaranteed Loan Program and no longer earn grant priority points. Right-sized roof systems tied to documented load are the favored path. This is USDA agency direction and pending rulemaking, not a statute, so confirm the live terms before you apply. Source: USDA press release, Aug 19, 2025.
For most farms in 2026, the barn or outbuilding roof wins: it doesn't take tillable acres out of production and it stays onside with USDA's funding direction, which now disfavors ground-mount on productive farmland. Use a field only if the roof can't carry or fit the system, and prefer marginal or non-tillable ground over prime soil. Sources: USDA; Ohio State University Extension.
A common extension rule of thumb is about 100 square feet of roof per kilowatt of solar. Ohio State University Extension's example: a farm using about 32,460 kWh a year needed roughly 22.4 kW (about 107 panels of 250 W over roughly 1,883 sq ft) to offset about 90% of its electricity. Modern higher-efficiency panels can need less area. Have a structural engineer confirm an older barn can carry the roughly 2-4 lb/sq ft of added dead load plus snow and wind. Source: OSU Extension Fact Sheet CDFS-4102.
Often yes, through agrivoltaics. The U.S. Department of Energy defines agrivoltaics as crop production, livestock grazing, or pollinator habitat under and between solar rows, and reports that over 4,000 megawatts of U.S. solar already have sheep grazing underneath, with facilities that can be designed with wider row spacing for small-tractor access. Ground-mount removes land from row crops but not necessarily from agricultural use. Source: DOE Farmer's Guide to Going Solar.
Free, no obligation, and sourced from the IRS, USDA, and EIA.