A farm roof is usually the cheapest source of energy the business will ever own. We survey it, model what the frame can carry, and arrange the design, the grid application and the installation through our MCS-certified partner.
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Agricultural rooftop solar is a photovoltaic array mounted on a farm building that converts daylight into electricity the farm consumes before it draws anything from the grid. The solar panels sit on the existing steel portal frame, the inverter turns direct current into the alternating current your board already uses, and any electricity the holding does not consume is exported under a Smart Export Guarantee tariff, which has run since the introduction of the scheme in 2020 (Ofgem). Every unit of energy the buildings take from the array is a unit of energy nobody has to buy.
A farm solar system is not a generator set and it does not replace your energy supply contract. Solar panels cut the volume of electricity you buy during daylight hours, so your energy bills fall in proportion to on-site consumption rather than to what the roof produces. The benefits of solar on farms are real and they are also specific to the building: the same array gives very different results on a machinery store that draws almost nothing and a dairy parlour cooling milk twice a day.
Three things decide whether solar is worth doing on farms: the roof, the load profile and the grid connection. Rising energy costs are what bring most farmers to solar in the first place, but we look at all three before anyone quotes, and we say so plainly when the answer is no. Energy prices are the common thread through every enquiry we take, and the common finding is that the building decides the outcome rather than the panels.
A farm building suits solar when it carries a large unbroken roof slope, an energy load beneath it worth serving, a frame with capacity to spare, and a covering with years of service life left in it. Most farms have several buildings and only one or two are worth an array, which is why the survey looks at the whole yard rather than the barn you happened to ask about.
Roof pitch and purlin spacing on agricultural buildings differ from the industrial sheds most solar panel companies work on. A general purpose barn is commonly pitched at 15 to 22 degrees rather than the six degrees of a distribution warehouse, which changes row spacing and wind loading, and the purlins are frequently timber or lighter cold rolled sections at wider centres.
The covering is the other difference, and on older farms it is the most common one. Fibre cement sheet, much of it asbestos cement on buildings put up before the mid 1980s, is found across British agriculture and counts as a fragile surface under HSE guidance on fragile roofs. None of that rules an array out. It changes the order of the work, and it is the single most common reason a farm quote and a warehouse quote for the same kWp look nothing alike. Two types of covering account for most of what we find across British farms: profiled steel sheet and fibre cement. A poultry unit put up last year and a poultry shed from 1978 are different projects for that reason alone.
The usual candidate: a wide span steel portal frame with a long unbroken slope and few penetrations, and normally the largest roof on the holding. Its own energy load is often modest, so self-consumption is the question rather than area.
Roof area is generous and the energy demand is lumpy. Drying fans and augers run hard from August into October and the building is close to idle the rest of the year, which pushes more of the generation towards export.
The strongest match on most farms. Ventilation, lighting and feed systems draw energy through daylight hours all year round, and summer ventilation peaks in exactly the weeks the array is producing most.
Milk cooling, vacuum pumps and water heating draw energy twice a day, every day. Morning milking usually starts before the array does, which is where battery storage earns its place rather than being sold as standard.
A large roof with almost no energy load beneath it. Worth using as roof area for an array serving the rest of the yard, rather than for the building's own consumption, which is close to nothing.
Refrigeration runs through the working day and peaks in warm weather. Of all the building types on a farm, this is the one where generation and energy demand line up most closely across the year.
Illustrative layout for a unit of this size. Your own figures come from the roof survey.
A farm solar survey is a structural, electrical and commercial assessment that establishes what your buildings can physically carry and what the resulting system would be worth. It is free, it carries no obligation, and the report is yours whoever ends up doing the work. It is also the only honest way to size an on-site energy scheme.
Asbestos is identified rather than worked around. Where a fibre cement roof is near the end of its life, re-sheeting first is usually cheaper than lifting an array off in five years to do it then, and the sequence is worth settling before a quotation is written rather than after.
We also ask what else is planned. A new building, a change of enterprise, a grain drier upgrade on an arable unit or a move to robotic milking on a dairy all shift the energy demand, and a system meant to last twenty years should be sized against the electricity the farm will use in ten years rather than the electricity it used last year. The survey records your own requirements alongside what the buildings can take.
Annual generation is the product of the system size in kWp and the energy yield for your location, expressed in kWh of electricity for every kWp installed. Across the towns on this site, modelled yield runs from 704 to 1,028 kWh per kWp a year (EU PVGIS v5.2, SARAH3), and every location page carries the figure for that area alongside its source, so the generation potential of a roof in Cornwall and one in Aberdeenshire are not treated as the same number.
Value follows consumption rather than generation. Electricity used on site displaces the day rate you would otherwise pay for energy, which is the highest value outcome available to farms. Electricity exported earns the Smart Export Guarantee rate from your chosen supplier (Ofgem), which is materially lower. That split is the largest single lever on payback and it is measurable from your existing energy data rather than assumed.
Farm loads make the split unusually interesting. An arable holding that dries grain through September and does very little in February has a generation curve and an energy demand curve that barely overlap, while a poultry unit or a cold store matches the roof almost hour for hour. Poultry buildings in particular run ventilation through the brightest hours of the year, which is why poultry is the enterprise that most often returns a strong result on the first pass. We model twelve months of consumption rather than an annual total, because the annual total hides exactly the thing that decides the return.
One dot per town, positioned at its centroid and shaded by modelled annual yield in kWh per kWp. Source: EU PVGIS v5.2.
The spread between the best and worst town on this map is 324 kWh per kWp, which is about 46 percent. On a 500 kWp array that is roughly 162,000 kWh a year of difference for the same money spent.
Renting land to a solar developer is a property transaction that pays an option fee and then rental income under a long lease, and it is a different proposition from putting panels on your own roof to cut your own energy bills. Both are worth considering, they answer different questions, and a farm business can sensibly do one, the other or neither, depending on where its energy costs actually sit.
A solar farm on your land is somebody else's asset. The developer funds the scheme, builds it, operates it and sells the electricity, and you receive income for a term usually measured in decades with that arable land out of production throughout. The Renewable Energy Planning Database records 383 ground mounted solar schemes across the towns this site covers in the United Kingdom (REPD, Q1 2026), so the pattern is well established, and the binding constraint on a solar farm is almost always the grid connection rather than the land itself.
A rooftop array is your asset. You fund it or finance it, the farm consumes most of the energy it makes, and the return is the electricity you no longer buy rather than a rent cheque. It uses no land, needs no change of use, and is a far smaller project to get through. Most farms we speak to have more roof than they realised and less spare electricity capacity than they hoped. Our short guide to the leasing route sets out what an option agreement actually commits you to, including the effect on tenancy, lending and succession.
We do not publish a rent per acre, because any figure quoted without knowing your grid position, your land grade and your distance to a connection point is a guess dressed up as advice. Diversification income from a solar farm is real, and so is the case for keeping the land, banking the income you already have and using the barn roofs for your own energy instead. We will say honestly which of the two routes a farm is actually suited to.
Planning permission for solar panels on farms turns on whether the array sits on a roof or on the ground, because the two fall under different parts of the planning system and attract completely different levels of scrutiny.
Roof mounted solar on an agricultural building in England is usually permitted development under Schedule 2, Part 14 of the Town and Country Planning (General Permitted Development) (England) Order 2015, subject to the limits and conditions that order sets out, including how far panels may project above the roof plane and prior approval in certain cases. Listed buildings, conservation areas, National Parks and National Landscapes change the answer, and Scotland, Wales and Northern Ireland have their own orders and their own requirements.
Ground mounted work is a different matter. Anything beyond a very small array needs a full planning application to the local planning authority, and schemes above 50 MW in England are determined by the Secretary of State as nationally significant infrastructure. Land quality carries weight too, because national planning policy asks decision makers to prefer poorer quality land over the best and most versatile agricultural grades. The local community is usually consulted, and on ground mounted schemes that consultation is where most objections arrive, whatever the energy case for the scheme.
We confirm the planning position with the local planning authority for your farm before the design is fixed rather than after. Where prior approval or a full application turns out to be needed, the survey pack already contains the drawings a planning case asks for, which is most of the reason it exists.
A grid connection on a rural holding is frequently the constraint that decides the size of a farm solar system, and it is the item we look at earliest rather than last.
Many farms sit at the end of a long rural spur on a single phase supply, or on a three phase supply with very little headroom left in it. Generation up to 16 A per phase connects under G98 by notification. Anything larger needs a G99 application to your distribution network operator, who assesses the local network against its own connection requirements and sets an export limit, and on a weak rural line that limit can come back well below the energy the roof could comfortably produce.
None of that is fatal to the project. An export limited system still displaces all the on-site energy the farm uses, and export limitation is a setting in the inverter rather than a smaller array. What it does change is the arithmetic, because a scheme sized for export and then capped is a scheme sized wrong. We ask the network question before the design, and where a supply upgrade is the honest answer we say what it involves and roughly how long it takes.
A battery is a storage system that holds generation the farm cannot use at the moment it is produced and releases it later. On farms, battery storage converts exported electricity into on-site electricity, which raises the value of every kWh of energy the solar panels make.
Farm loads make the case for storage more often than commercial ones do. Morning milking on a dairy starts before sunrise, evening ventilation in a poultry unit runs long after the array has stopped, and a holding sitting under a restrictive export limit has an obvious use for energy it is not permitted to send anywhere.
Storage carries other benefits as well, and on farms the list is longer than it is on a commercial site: holding cheap overnight energy, supporting a telehandler or tractor charger, and carrying a critical load such as milk cooling through a rural power cut, which is a common enough event on a long spur to be worth designing for. We size any battery against twelve months of real data rather than a rule of thumb.
The cost of a farm solar system is set by the array size, the roof it lands on and the grid work the connection needs, and the payback is the electricity you stop buying, valued at the energy price you would otherwise have paid for it, set against that cost. There is no third element, whatever a rate card implies.
Price for every kWp falls as the array grows, because access, design, the grid application and commissioning are largely fixed costs spread across more solar panels. Roof condition is the variable that moves a farm quote most: a sound steel sheeted barn and a fibre cement roof needing re-sheeting are two different projects at the same kWp. We ask our partner to break a quotation into those lines so you can see which is which. We do not publish a price per kWp, because a figure given without seeing the building is a guess.
Tax relief is part of the arithmetic and it is regularly misunderstood on farms. HMRC treats a solar panel array as an integral feature, which places the expenditure in the special rate pool (HMRC Capital Allowances Manual, CA22335), though the Annual Investment Allowance will normally cover it instead. Full expensing is available to companies rather than to sole traders and partnerships, which is the distinction that matters when the farm business is a partnership. Your accountant confirms the position for your own business structure.
Grant funding moves around. Defra's Improving Farm Productivity grant and the Farming Equipment and Technology Fund have both opened and closed in rounds, and the eligible item lists change each time, so we point you at the current position on gov.uk rather than quoting an amount that may have lapsed. Our grants guide tracks where each one stands and what it has funded on farms, and our cost guide shows what the benefits look like set against your own quotation.
Agrivoltaics is the practice of running agricultural production and solar generation on the same ground rather than choosing between them, and on UK solar farms it usually means grazing livestock between the rows.
Sheep graze under most British ground mounted arrays without difficulty. Table height and row spacing suit livestock of that size, the grass still needs managing, and the land stays in agriculture for the term of the lease. Cattle are the harder case, because they rub against posts and frames and need clearances a standard table does not offer, so schemes either fence livestock of that weight out and graze sheep instead, or the developer specifies raised and strengthened frames from the outset.
Other approaches exist and remain comparatively rare here: widely spaced or elevated rows over arable crops, and vertical bifacial fences along arable field boundaries that let machinery work between them. Margins and headlands under an array also support wildflower and pollinator planting, and those environmental benefits are the argument most planning cases lean on, alongside the community energy case where a scheme has local backing.
A rooftop array sidesteps the whole question, because the energy is generated over a yard that is already built on. That is the honest environmental case for looking at your barns before your fields.
Installation is a fixed sequence that runs from survey through to commissioning, and on farms it is mostly paperwork, access and weather rather than panels.
The connection is the long pole, which is why we submit it early rather than after a contract is signed. Anything above 3.68 kW per phase runs under G99, and the network operator sets the export limit.
Work starts with the survey and the design, then the grid application, because anything above 16 A per phase connects under G99 and the network operator sets the export limit. Then access, mounting, the modules themselves, the DC and AC electrical work and the tie in to your board. Then commissioning, testing of the solar panels and inverters, the MCS certificate and handover of the operation and maintenance file.
Time on the roof of a typical farm building is a matter of days rather than weeks. The connection is the long pole, which is why it goes in early. We plan around the farming calendar as well, because nobody wants scaffold against the grain store in September or a dairy parlour roof open during milking.
Maintenance afterwards is light: an annual inspection, a check on the inverters and clearing anything that has grown up to shade the array. An annual energy review is worth running alongside it, because a change of enterprise changes the electricity the buildings draw. Inverters carry the shortest working life in the system, so plan on replacing them once inside the solar array's life and treat that as a maintenance cost rather than a surprise. Two types of fault account for most call-outs on farms: soiling and shading, rather than anything wrong with the panels themselves.
Send the postcode and roughly what is in the yard. We come back with what the roofs can carry, what an array would generate against your own energy use, and what the funding routes look like on those numbers.
No survey fee, no obligation. Lenzie Consulting Ltd arranges the survey and passes your details to our MCS-certified installation partner so they can quote.