Arable farm solar panels: power your grain store from the roof above it
Arable farm solar panels turn the vast grain-store and machinery-shed roofs that already dominate your yard into a working power station — one that generates hardest in the exact weeks your grain dryers, augers and store fans are flat out. For large-scale cereal and combinable-crop growers, that timing alignment is the whole commercial case: late-summer sunshine meets late-summer drying load, so a high share of every generated unit is consumed on-site rather than exported, displacing grid electricity at 30–40p/kWh instead of selling it at the lower export rate.
The result is some of the fastest paybacks in agriculture — typically 1.6 to 2.6 years once the Farming Equipment and Technology Fund grant and first-year tax relief are applied. After that, you are running grain drying, ventilation and workshop power on electricity that costs you nothing to generate, for 25 years or more, with a fixed asset that lifts the value and resilience of the holding.
Why arable farms are ideal for solar
Arable enterprises have an energy-demand profile that suits solar almost perfectly. Unlike a livestock unit with steady year-round draw, a combinable-crop farm has one enormous, predictable, seasonal spike: grain drying and storage. From the first cut in late July through to October, continuous-flow and batch dryers, ducted floor stores, pedestal fans and intake augers can multiply your electricity bill several times over. It is the most expensive period in your farming year for energy — and it lands in the highest-generation months of the solar calendar.
That coincidence is what makes arable solar so profitable. A south-facing or split east–west array on a grain store is producing close to its annual peak in August, September and October. Rather than importing expensive grid power to dry that season’s wheat, barley, oilseed rape or beans, you draw it straight off your own roof. Self-consumption is the most valuable form of solar economics, and the arable harvest pattern delivers it naturally without batteries or load-shifting.
The physical estate fits too. Arable farms carry some of the largest agricultural building footprints in the country: grain stores of 1,000–4,000 m², general-purpose machinery sheds, fertiliser and chemical stores, and workshop ranges. These steel-portal roofs are exactly what large arrays want — broad, unshaded, structurally generous and already connected to a meaningful supply. A single grain-store roof routinely supports 100 to 500 kWp, enough to cover a substantial part of total farm consumption.
Beyond drying, arable operations carry steady secondary loads that solar offsets year-round: grain-handling augers and conveyors, store ventilation and aeration fans, the farm workshop, cold and ambient storage, office and weighbridge supply, and — on lighter land or in the drier east — borehole and reel-irrigation pumping through the growing season. Each of those is a unit you would otherwise buy from the grid.
Typical arable farms solar system & costs
The table below shows representative arable installations. Figures are ranges, not quotes — every farm’s drying load, roof and DNO connection differs. Net cost assumes a 40% FETF grant and first-year Annual Investment Allowance relief on the residual.
| System size | Suits | Gross cost (£600–900/kWp) | Net after FETF + AIA | Typical payback |
|---|---|---|---|---|
| 100 kWp | Single grain store, modest dryer | £60k–£90k | £25k–£40k | 1.6–2.2 yrs |
| 250 kWp | Large store + machinery shed | £150k–£225k | £62k–£100k | 1.9–2.4 yrs |
| 400 kWp | Multi-building, high drying load | £240k–£360k | £100k–£160k | 2.0–2.5 yrs |
| 500 kWp | Estate-scale, irrigation + drying | £300k–£450k | £125k–£200k | 2.2–2.6 yrs |
Two factors keep arable paybacks at the fast end of the range: high self-consumption during the drying peak, and the scale of agricultural roofs, which spreads fixed costs (scaffold, DNO connection, inverters) across more kilowatts. For a detailed cost breakdown by system size, see our agricultural solar panel cost guide, which models gross price, grant impact and payback for typical farm arrays.
Equipment & energy breakdown
A well-specified arable system is built around your largest loads rather than simply maximising roof fill. Typical components and their role:
- Panels (100–500 kWp): Tier-1 monocrystalline modules, 450–580 W, mounted on the grain-store and shed roofs. East–west splits are common on arable buildings to widen the generation curve across the working day, when handling and drying run from dawn.
- Inverters: String or central inverters sized to the drying and handling profile. Oversizing the DC array relative to inverter capacity (a modest DC:AC ratio) lifts yield in shoulder months when drying still runs.
- Three-phase distribution: Grain dryers, large fans and augers are almost always three-phase. We tie the array into the farm’s main three-phase board so generation feeds drying directly.
- Optional battery storage: Less essential than on a steady-load farm because arable self-consumption is already high during the harvest peak, but worth modelling where evening drying or grain-chilling pushes load past sunset.
- Export metering and SEG: Surplus outside the drying season — spring and early summer, before harvest — is exported under a Smart Export Guarantee tariff, turning quiet months into income.
- Monitoring: Per-string and consumption monitoring so you can see drying load and generation side by side, and verify the system is performing across each harvest.
The energy logic is straightforward: drying and storage dominate, peak in late summer, and coincide with peak generation. Augers, fans, workshop and irrigation provide a steady baseload the rest of the year. A system sized to that pattern keeps self-consumption high, which is the single biggest lever on payback.
Grants and finance for arable farms
Arable solar is one of the best-supported capital investments in farming. The headline route in England is the Farming Equipment and Technology Fund (FETF), which contributes up to 40% of eligible costs on qualifying rooftop solar and associated equipment — a substantial reduction before any tax relief is considered. The devolved nations run equivalents: the Welsh Government Farm Business Grant, Scottish CARES interest-free loans, and Northern Ireland’s farm energy efficiency support.
On top of the grant, the Annual Investment Allowance lets you write off 100% of the residual investment against taxable profits in the year of installation (currently up to a £1m cap). For a profitable arable business, that first-year deduction can recover a further large slice of the net cost through reduced corporation or income tax. Where the array exports surplus — typically in the low-load spring months before harvest — the Smart Export Guarantee (SEG) pays for every unit sent to the grid, adding a modest but genuine income stream.
For growers who would rather not commit capital ahead of a variable harvest, zero-upfront options exist: a Power Purchase Agreement lets you buy the solar electricity at a fixed rate well below grid price with no capital outlay, while asset finance spreads the cost over 5–10 years against the farm’s cash flow. Our farm solar grants and funding guide walks through eligibility, deadlines and how FETF, AIA and SEG stack together on a single arable project.
Most arable farms use permitted development rights for rooftop arrays under 1 MW on existing agricultural buildings, so planning is rarely a barrier outside listed buildings, conservation areas, AONBs and National Parks. A structural survey confirms purlin and rafter capacity before install, and any asbestos-cement roofing on older stores is removed under licence as part of the works. Three-phase supply upgrades, where needed for larger dryers, are arranged with your regional DNO.
If your holding spans other enterprises, the same economics apply across the yard — see our pages on solar for [dairy farms](/farm-types//) and [poultry farms](/farm-types//), where continuous refrigeration and ventilation loads make on-site solar equally compelling.
Get a quote for solar on your arable farm
Free desk-based feasibility from your half-hourly meter data, sized to your grain-drying and handling profile. Fixed-price proposal within 7 working days. We cover England, Wales, Scotland and Northern Ireland from regional installation hubs.
Typical arable farms install at a glance
- System size
- 50–500 kW
- Project value
- £50k–£400k
- Simple payback
- 4.5 years
- Grants
- FETF / Welsh FBG / Scottish CARES eligible
Common questions
How much do arable farm solar panels cost?
Commercial arable systems run £600–£900 per kWp gross. A 100 kWp grain-store array is roughly £60k–£90k; a 250 kWp scheme £150k–£225k; a 500 kWp installation £300k–£450k. After a 40% FETF grant and first-year Annual Investment Allowance relief, the net cost typically falls by half or more, which is why paybacks land so quickly.
What size solar system does an arable farm need?
Most combinable-crop farms suit 100–500 kWp. Sizing follows your grain-drying load — the dominant draw — plus augers, fans, workshop and any irrigation. A large grain store or machinery shed roof of 800–4,000 m² comfortably carries this. We size from half-hourly meter data so generation matches your August–October drying peak.
Why is payback so fast on arable farms?
Arable solar typically pays back in 1.6–2.6 years. Generation peaks in late summer exactly when grain dryers, augers and store fans run hardest, so a high share is used on-site rather than exported at the lower SEG rate. Self-consumed units offset 30–40p grid electricity, which compounds the FETF and AIA savings.
Will solar cover my grain-drying energy use?
Grain drying is the single largest electrical load on most arable farms and peaks in August to October — precisely when solar output is strongest. A correctly sized 100–500 kWp array can supply a large slice of drying, auger and ventilation demand directly, cutting your most expensive harvest-period bills when cash flow is already stretched.
Can arable farms get the FETF grant for solar?
Yes. The Farming Equipment and Technology Fund (FETF) is the main capital route in England, covering up to 40% of eligible costs, with equivalent schemes in Wales, Scotland and Northern Ireland. Combined with 100% first-year Annual Investment Allowance and SEG export income, most arable installs recover well over half their cost through grants and tax relief.
Related pillar pages
- • Farm solar pricing 2026 — by system size
- • How much do solar panels cost on a farm? Full breakdown
- • UK farm solar grants 2026 — FETF, FBG, CARES, DAERA
- • 2026 grant application calendar
- • Finance options — capex, asset finance, PPA
- • How to choose an agricultural solar installer
- • Farm solar maintenance after installation
- • Farm solar glossary A–Z
- • Real installation case studies