Solar Panels for Poultry & Pig Units

Why a poultry or pig unit is the best solar roof on the farm

Of every barn type in the British countryside, a poultry or pig unit gives solar PV the strongest economics — and it does so for one simple reason. A broiler shed, layer house or pig-finishing building pairs an enormous, simple, clear-span roof with a high, near-constant electrical load that runs around the clock, every day of the year. Ventilation fans never stop. Heating, lighting, automated feed lines, water systems and environmental controls draw power through the night and through the depths of winter. That is precisely the load profile solar is least suited to on a house and most suited to on a livestock building: when a roof generates electricity in daylight, there is always a real demand on site to soak it up.

The building itself is close to ideal. Modern poultry and pig sheds are long, low, steel-framed structures with profiled-sheet roofs spanning hundreds of square metres in a single unbroken plane — no dormers, no valleys, no chimneys, rarely any shading. A single shed presents one of the cleanest mounting canvases you will find anywhere, and most enterprises run several sheds side by side. The result is a roof you can size aggressively against a baseload that genuinely consumes the output. This is why self-consumption on a working poultry or pig unit routinely exceeds 85% — most of what you generate is used on site, displacing grid power at the full import rate rather than being exported at a lower tariff. High self-consumption is the single biggest driver of a fast payback, and it is the defining advantage of this barn type.

Sizing and the roof

A poultry or pig array typically lands somewhere between 50 kW and 500 kW, using roughly 90 to 920 panels across 300 to 3,000 m² of roof. Where that figure sits within the range depends on three things: how many sheds you have, how much clear roof faces a usable direction, and — crucially — how big your baseload is. Unlike a domestic install, you are not sizing to the roof; you are sizing to the load. There is almost always more roof than you need, so the design conversation is about matching panel capacity to the electricity the site actually burns through the day and night.

As a rule of thumb, every kilowatt of panels needs around 7–8 m² of clear roof. A 100 kW system therefore wants roughly 700–800 m² — well within reach of a single modern shed, and easily covered across a multi-shed complex. A larger broiler or finishing complex can host 250 kW or more spread across several roofs, feeding one shared connection.

The roof structure matters. Modern poultry and pig units are engineered steel portal or column-and-truss frames built to carry snow and wind loading, so they generally take the modest added dead load of PV — around 10–15 kg/m² — with nothing more than a short structural appraisal to confirm purlin spacing and frame capacity. Profiled box-profile or fibre-cement sheeting accepts proprietary roof-fixing systems cleanly. This is the same structural logic that makes steel-frame portal barns such efficient solar hosts, and many poultry and pig sheds are, in effect, specialised portal frames.

The one structural caveat is age. A shed built before 2000 may have an asbestos-cement roof, and asbestos cement cannot be drilled or loaded with panels — only a licensed contractor may remove it under CAR 2012. Where that is the case, the proven route is a combined strip-and-reclad to modern profiled steel followed by PV on the new roof, so a long-deferred roof problem and an energy upgrade get solved in a single project. If your sheds were re-clad in the last twenty years, this rarely arises; if they are older, it is the first thing we check on survey.

What a typical system looks like

Specification	Typical poultry / pig unit range
System size	50–500 kW
Number of panels	90–920
Roof area required	300–3,000 m²
Indicative project value	£40,000–£450,000
Annual generation	45,000–460,000 kWh
CO₂ saved per year	10–106 tonnes
Typical payback	around 4.5 years

The economics: a worked example

The numbers are best shown with an illustrative scenario rather than a generic claim. Take a typical 180 kW broiler-shed install spread across two clear-span steel roofs facing close to south. A system of that size generates in the order of 165,000 kWh a year in a UK climate. Because the sheds run continuous ventilation, heating and lighting 24 hours a day, the great majority of that generation is consumed on site rather than exported — self-consumption of roughly 85–88% is realistic for a busy poultry unit.

With most of the output displacing grid electricity at the full import price, the saving is substantial. At a representative commercial import rate, a self-consumption-led 180 kW system can offset on the order of £35,000–£40,000 of annual electricity cost, with a modest additional income from the small surplus exported under the Smart Export Guarantee. Against an installed cost that falls toward £700–£850 per kW at this scale, that level of saving puts the payback in the region of 4.5 years — and once the system is paid off, it carries on generating for the balance of a 25–30 year panel life, effectively at zero marginal cost.

Two honest caveats keep this realistic. First, the payback this fast depends on a genuine 24/7 load — if a shed sits empty between batches for long stretches, self-consumption drops and more output is exported at the lower SEG rate, lengthening the return. Second, the import price you are displacing drives everything: the higher your unit rate, the faster the payback, which is why poultry and pig operators — among the most electricity-intensive farm businesses — see the best returns of any barn type. We model your actual half-hourly consumption before quoting so the figures reflect your site, not an average. You can explore the wider cost picture across barn types on our cost page, or ask for a desk feasibility from your meter data via the quote form.

Planning and compliance for poultry and pig units

The planning position is usually the simplest part of the project. Rooftop PV on a working agricultural building — which a poultry or pig unit is — is normally Permitted Development under Class A, Part 14 of the GPDO 2015, provided the panels do not protrude more than 0.2 m above the roof plane and the capacity and siting limits are met. In the overwhelming majority of cases that means no planning application is needed at all. The exceptions are the usual ones: a listed building, or a site inside a conservation area, National Park, AONB or the Broads, where the consenting route tightens. Few purpose-built poultry and pig sheds fall into those categories, but we confirm your exact status before design.

What is genuinely specific to this barn type — and what separates a competent installer from a careless one — is biosecurity. Poultry and pig units operate under strict disease-control regimes, and an install must work with them, not against them. That means scheduling the physical works around crop or batch cycles, ideally during the turnaround when a shed is empty and being cleaned; full disinfection of plant, tools and personnel; controlled access with boot dips and restricted movement; and a commissioning sequence staged so that ventilation, heating and emergency-power systems are never interrupted while stock is present. Bird and animal welfare cannot be put at risk for the sake of a roof job, and a good install plan treats the site's health protocols as a fixed constraint from day one.

On the electrical side, a G99 application to your Distribution Network Operator is required above 3.68 kW per phase, which every system of this scale will exceed. Rural networks are frequently capacity-constrained, so we submit the G99 alongside the structural survey to start the DNO clock immediately. Where export capacity is tight, a poultry or pig unit is in the fortunate position of having a large on-site load to consume the output — so an export-limited or self-consumption-led design often secures a connection far faster than a scheme that needs to push surplus back to the grid.

Funding that fits a working poultry or pig unit

Because a commercial poultry or pig unit is owned by a trading business, the funding picture is led by tax relief rather than residential incentives.

• 100% Annual Investment Allowance (AIA). Solar PV qualifies as plant and machinery, and almost every poultry or pig install sits well within the £1m annual AIA cap — so the whole capital cost can be written off against taxable profit in year one. For a limited company that can mean an effective tax saving of around a quarter of the project value in the first year; sole-trader and partnership farms get comparable relief.
• Smart Export Guarantee (SEG). Any surplus you do export — typically a small share on a high-self-consumption site — earns an SEG tariff, usually in the 4–15p/kWh range depending on supplier. MCS certification is the gateway, and we install to it as standard.
• Sector and devolved grants. Where solar is paired with eligible equipment such as a ventilation or environmental-control upgrade, it can sit alongside farm productivity grant schemes; Welsh and Scottish operators should check their devolved capital-grant frameworks, which can carry intervention rates of 10–40%.

Note that the 0% VAT rate on energy-saving materials applies to residential property, so it is relevant to a barn conversion that is someone's home — not to a commercial poultry or pig building, where the AIA route does the heavy lifting instead. We set out the full funding picture, including which reliefs apply to your specific situation, on the grants and funding page.

Frequently asked questions

Why do poultry and pig units pay back faster than other barns?

Because they pair a huge clear-span roof with a high, near-constant electrical load — ventilation, heating, lighting, feed and water systems running 24 hours a day, 365 days a year. That means self-consumption routinely exceeds 85%: most of what the panels generate is used on site, displacing grid electricity at the full import rate rather than being exported at a lower tariff. High self-consumption is what drives payback below five years, and no other barn type has a load profile that matches solar generation as well. By contrast, a grain store or crop barn has an equally large roof but a seasonal, autumn-weighted drying load, so it usually needs a battery or an export-led design to get the most from solar.

Will the installation disturb my birds or pigs?

No — a properly planned install is built around your batch or crop cycle, ideally taking place during the turnaround when a shed is empty and being cleaned down. Biosecurity is treated as a fixed constraint: full disinfection of tools and personnel, controlled access with boot dips, and a commissioning sequence staged so that ventilation, heating and emergency-power systems are never interrupted while stock is present. Welfare and disease control come first, and the works fit around them.

How much roof do I need across a multi-shed site?

A worthwhile system needs roughly 7–8 m² of clear roof per kilowatt of panels — so a 100 kW array wants around 700–800 m². Most modern poultry and pig sheds offer far more than that on a single clear span, and across several sheds a complex can comfortably host 250 kW or more feeding one connection. The practical limit is almost never the roof; it is your on-site load and your grid connection. We size to your actual consumption so you do not over-build for a load that is not there.

What if my sheds have asbestos-cement roofs?

Asbestos cement — common on sheds built before 2000 — cannot be drilled or loaded with panels, and only a licensed contractor may remove it under CAR 2012. The standard solution is a combined strip-and-reclad to modern profiled steel followed by PV on the new roof. The solar business case often part-funds the re-roof you were going to need anyway, so an ageing roof and an energy upgrade are resolved in one project. If your sheds were re-clad in the last twenty years this rarely applies, and we confirm the roof construction at survey before any design is finalised.