Solar Panels for Arable Farms

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 is still producing well as harvest begins and your grain dryers, augers and store fans run flat out. For large-scale cereal and combinable-crop growers, that timing overlap is the heart of the commercial case: late-summer sunshine meets late-summer drying load, so the units generated at harvest are consumed on-site rather than exported, displacing imported grid electricity instead of being sold at the lower export rate.

Payback depends on what the system costs, how much of its output the farm uses itself in daylight, and the grid price — so ask for a calculation built from your own half-hourly meter data (see the worked payback example). On an arable farm, that turns on how much generation lands in the drying weeks rather than the quieter spring months.

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 push your electricity use far above the rest of the year. It is the most expensive period in your farming year for energy — and it overlaps the late-summer end of the solar season.

That overlap is what makes the arable case work. A south-facing or split east–west array on a grain store is still producing well in August, though output falls through 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: large grain stores, 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 can support 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 system sizes — not quotes, as every farm’s drying load, roof and grid connection differs. The DESNZ 2025/26 median for 10–50 kW systems is £1,262 per kW; there is no official cost series above 50 kW.

Two factors shape arable payback: how much of the year’s output is used on site during the drying season, and the scale of agricultural roofs, which spreads fixed costs (scaffold, grid connection, inverters) across more kilowatts. For a detailed cost breakdown and a worked payback example, see our agricultural solar panel cost guide.

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. The array should tie 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 overlap the late-summer end of the generation season. 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

In England, the Improving Farm Productivity (IFP) grant funded 25% of eligible costs, with grants of £15,000 to £100,000, for rooftop solar and irrigation-reservoir solar only — ground-mounted arrays on land were not eligible. Round 2 has closed for applications and no solar round is open at the time of writing (September 2026). The Farming Equipment and Technology Fund’s 2026 window closed on 12 May 2026. Wales, Scotland and Northern Ireland run their own schemes.

Solar panels are special rate expenditure under section 104A(1)(g) of the Capital Allowances Act 2001, and the £1m Annual Investment Allowance lets most farm businesses deduct the full cost in the year of purchase. Companies can instead claim the 50% first-year allowance on new and unused special-rate assets bought from 1 April 2023, with the rest in the special rate pool at 6% a year; full expensing does not apply to solar panels. 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 an agreed rate with no capital outlay, while asset finance spreads the cost over several years against the farm’s cash flow. Our farm solar grants and funding guide walks through eligibility, deadlines and how grants, capital allowances and SEG fit together on a single arable project.

In England, rooftop arrays on agricultural buildings are usually permitted development under Class J of Part 14 of the GPDO 2015 (see farm-building rules), but arrays above 50 kW need prior approval from the council on design and external appearance, and Class J does not apply to listed buildings (or their curtilage) or scheduled monuments. Class K allows only one stand-alone array of no more than 9 m² of panels, so a field array of any real size needs full planning permission. A structural survey confirms purlin and rafter capacity; asbestos-cement sheets on older stores are always fragile, cannot bear weight and should not be drilled — overclad or re-sheet instead (see asbestos roofs). Arrays this size need a G99 application to the network operator.

If your holding spans other enterprises, the same economics apply across the yard — see our pages on solar for dairy farms and poultry farms, where continuous refrigeration and ventilation loads make on-site solar equally compelling.

Get a quote for solar on your arable farm

Send your meter data and roof details., sized to your grain-drying and handling profile. Free enquiry, no obligation, anywhere in England, Wales, Scotland and Northern Ireland.

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Related pillar pages

• • Farm solar costs 2026 — government data by size
• • Solar panels on farm buildings — roofs, rules and grants
• • UK farm solar grants — what is open and closed
• • 2026 grant position
• • Finance options — capex, asset finance, PPA
• • How to choose an agricultural solar installer
• • Farm solar maintenance after installation
• • Farm solar glossary A–Z
• • Worked examples by farm type (modelled)