Livestock Farms (Beef/Sheep/Pig/Poultry): Solar panels for dairy farms

Why the wider livestock side of a dairy estate suits solar

Plenty of dairy businesses run other stock alongside the milking herd, whether that is beef finishing on the back of dairy-bred calves, a sheep flock on the grazing, or a separate pig or poultry enterprise as a diversification. Those livestock buildings are usually large, simple and structurally well suited to PV, and the loads are genuine, so they add to the solar case a dairy is already making with its parlour. The strongest case is a modern poultry or pig shed: huge clear-span roofs running ventilation, heating and lighting almost continuously, with self-consumption typically 80% or more and a fast payback. Free-range egg and broiler operations align especially well with the summer solar peak, when ventilation runs hardest and generation is highest. At the other end of the range, beef yards and sheep enterprises with lower building demand often do better with a ground-mount or a shared array that also serves the dairy. The point is that the livestock side of a dairy estate gives you more roof, more load and more options to spread a single solar investment across.

As with the milking herd, energy is a controllable cost in a sector where output prices are not, and assurance schemes and retail buyers increasingly reward evidence of on-site renewable generation. For an intensive unit feeding a supermarket contract alongside a dairy supplying a processor, that auditable Scope 2 evidence is worth having across the whole farm, not just on the parlour, and it strengthens both supply relationships at once.

The livestock buildings on a dairy estate also tend to be exactly the kind of structures that suit PV best: large, modern, clear-span steel-framed sheds with simple pitched roofs and no awkward valleys or rooflights to work around. A broiler or pig shed of that type can carry a substantial array with a straightforward mounting system, and because the roof was built to a known engineering standard the structural survey is usually quick and the result predictable. That contrasts with some older, lower farm buildings where the roof structure limits what can safely be carried. When we look at a mixed dairy and livestock holding, the first thing we do is identify which roofs are genuinely good candidates and which would need strengthening or a reclad, so the investment goes onto the buildings that will repay it fastest.

What a typical livestock install looks like and how we size it

We usually design livestock systems in the 20 to 300 kW range, roughly 37 to 550 panels over 120 to 1,800 square metres of shed roof, generating around 18,000 to 275,000 kWh a year and saving 4 to 63 tonnes of CO2. Sizing follows the building and the load behind it. A clear-span broiler shed with constant ventilation justifies an aggressive system sized for self-consumption, because almost everything it generates is used on site. A beef yard with modest demand is better matched to a smaller array, or to a ground-mount that also feeds the parlour and the bulk tank, so no generation is wasted. We pull half-hourly data so the system matches what the unit genuinely draws rather than an optimistic nameplate maximum, and on a mixed farm we look at the livestock and dairy loads together so the generation is always being used somewhere on the holding. Pig units, with high winter heating and summer ventilation, often suit a system tuned to year-round demand, while poultry sheds peak with the summer sun.

Costs, payback and tax relief

A livestock project typically runs £22,000 to £270,000 with a payback near 6 years. The 100% Annual Investment Allowance lets most farm businesses write off the full cost against profit in year one across the combined dairy and livestock operation, so the relief is felt immediately rather than spread over years. The Smart Export Guarantee pays for any surplus at four to fifteen pence per kilowatt hour, although a high-baseload poultry or pig unit exports relatively little. For intensive units with very high self-consumption the return is driven by avoided import rather than export, which is the stronger position to be in, and it mirrors exactly how the dairy parlour itself pays back. See the cost guide for worked figures by shed type, including how the economics differ between a constant poultry load and a seasonal beef yard.

It is worth being clear that the payback on a beef or sheep enterprise with modest building demand will sit at the slower end of that range, while a poultry or pig shed with constant ventilation will sit at the faster end, often close to the dairy parlour's own payback. That spread is precisely why we model each building on its own load rather than applying a single farm-wide figure. Where a beef yard's own demand is too low to justify filling its roof, we will often recommend a smaller array that the parlour and tank can absorb, or a ground-mount that serves the whole holding, so the capital is never tied up in panels whose output has nowhere economic to go. The combined relief under the Annual Investment Allowance across the whole farm business means even a slower-paying livestock array still benefits from immediate tax treatment in the year it is installed.

Funding routes in detail

The 100% Annual Investment Allowance is the universal route, expensing qualifying plant in year one up to the one million pound cap, which covers almost every livestock shed install on a farm of this kind. The Smart Export Guarantee pays four to fifteen pence per kilowatt hour for export, though high-baseload poultry and pig units export little because they consume their own generation. The Sustainable Farming Incentive rewards biodiversity and integrated farm management actions at roughly five hundred to five thousand pounds per hectare per year, and stacks well where sheep or beef graze beneath a ground-mount array on the same land. The Farming Investment Fund can be relevant where solar is paired with an eligible capital item, so it is worth checking. Welsh and Scottish farms should check the devolved schemes, the Welsh Rural Investment Scheme and Scottish Rural Development Programme, with their typically higher intervention rates of ten to forty per cent.

Compliance and sector considerations

Animal welfare regulations are unaffected by a rooftop install, but biosecurity governs how we work. Boot dips, restricted access and cleaning protocols apply throughout, and we plan access routes that keep the install away from clean areas and away from the milking parlour where the two enterprises share a yard. Rooftop PV on agricultural buildings is permitted development within the Class A Part 14 size limits. As with the dairy buildings, pre-2000 sheds often have asbestos cement roofs under the Control of Asbestos Regulations 2012 that cannot take panels and need a licensed reclad first, which the PV business case can help fund. A G99 grid application is needed above 17 kW per phase, and rural networks are frequently capacity-constrained, so an early connection study matters. We hold MCS commercial certification, NICEIC, RECC and TrustMark, and work to ISO 14001, so the install satisfies both regulation and your farm assurance auditors.

How we approach this kind of project

We start with half-hourly meter data for the livestock unit and, on a mixed farm, the dairy alongside it, so the design reflects the real combined load rather than one enterprise in isolation. We size for self-consumption, carry out a structural and asbestos survey before quoting, and submit the G99 application early to start the DNO clock. We schedule the work around your stocking and movement calendar and your milking routine, and we coordinate biosecurity carefully with your existing protocols so the install never compromises the health status of the unit. You receive a fixed-price proposal with modelled generation, saving and payback, and an insurance-backed workmanship warranty on the install that outlasts any single contractor.

Biosecurity is the point that most distinguishes a livestock install from any other farm building, and we treat it as a hard constraint rather than a box to tick. Before work starts we agree the access route, the parking and welfare arrangements for the install team, and the cleaning and disinfection regime, all signed off against your unit's own protocols. On a high-health poultry or pig site we will phase the work so that no clean area is ever crossed by an unrestricted vehicle, and we will time the install to fit around your crop or batch cycle wherever possible. The same discipline applies where the livestock buildings share a yard with the dairy, so the milking parlour's hygiene and the unit's biosecurity are both protected throughout. None of this adds cost if it is planned from the start, which is exactly why we raise it at the survey rather than on the first day on site.

An illustrative example

As an illustrative composite based on typical UK projects, and not a real named client or real project: a dairy farm with a separate free-range broiler enterprise across two large clear-span sheds, carrying a high year-round ventilation load, installed around 150 kW across the shed roofs, generating in the region of 140,000 kWh a year. With ventilation running constantly the self-consumption sat above 80%, the cost was written off in year one under the Annual Investment Allowance, and the payback came in close to 6 years, while a separate array served the milking parlour and bulk tank. The figures are illustrative and depend on your buildings, stocking density and tariff, which is why we always model your own data before recommending a system size. A beef or sheep enterprise on the same farm, with far lower building demand, would point to a smaller array or a ground-mount sized to serve the whole holding rather than the yard alone, and the payback on that element would sit nearer the slower end of the range, which is exactly the kind of trade-off we set out clearly before any commitment is made.

If the milking herd is the priority, see solar for dairy farms, and if you crop as well see arable farm solar. Compare the numbers on the cost guide and the grants and funding page, then request a free feasibility or read the dairy solar FAQs.