Solar Panels for Farms
Cut electricity costs by 40–85% across poultry, dairy, arable and mixed holdings. MCS-certified agricultural solar with full G99 connection management and AIA tax relief support.
7–9 yr
Typical payback
88,000 kWh
Per 100kWp annual yield
£22,000/yr
Avoided cost per 100kWp
25 yr
Panel warranty
Why Farm Solar Makes Exceptional Financial Sense
Agriculture is one of the most energy-intensive industries in the UK, yet farms have two unique advantages that make solar more financially compelling than almost any other sector: large, unobstructed south-facing roof areas and high daytime electricity demand aligned with peak solar generation hours. Grain dryers, milking parlours, poultry ventilation, irrigation pumps, and cold stores all consume electricity during daylight — precisely when solar panels produce the most power.
The Annual Investment Allowance (AIA) allows you to deduct 100% of the installation cost from taxable profit in year one, slashing the effective net cost by 19–25% depending on your tax position. A sole trader or partnership claiming AIA on a £90,000 system at the basic rate saves £18,000 in tax — reducing the real net cost to £72,000 before a single unit of electricity has been generated. Combined with today's electricity prices of 22–28p/kWh, the investment case is stronger than it has been at any point in the past fifteen years.
Farm Building Types and Recommended System Sizes
Different agricultural buildings have different solar potential. The table below shows indicative system sizes based on roof area and typical energy loads. All figures assume south-facing or east/west split orientation at 35° pitch; flat-roof ballasted systems see approximately 8% lower yield.
| Building Type | Roof Area | Recommended System | Annual Yield | Primary Load Offset |
|---|---|---|---|---|
| Grain store / arable barn | 500–1,500 m² | 50–150 kWp | 44,000–132,000 kWh | Grain dryers, augers |
| Poultry house (40k birds) | 1,000–2,000 m² | 100–200 kWp | 88,000–176,000 kWh | Ventilation fans, lighting |
| Dairy / milking parlour | 200–600 m² | 20–60 kWp | 17,600–52,800 kWh | Milking, refrigeration |
| Pig unit (500 sow) | 800–1,500 m² | 80–150 kWp | 70,400–132,000 kWh | Ventilation, heating |
| Farm workshop / machinery store | 300–800 m² | 30–80 kWp | 26,400–70,400 kWh | Welding, compressors |
| Cold store / pack house | 400–1,200 m² | 40–120 kWp | 35,200–105,600 kWh | Refrigeration compressors |
| Polytunnel growing facility | 1,000–5,000 m² | Ground mount 50–500 kWp | 44,000–440,000 kWh | Irrigation, lighting, fans |
| Farm shop / holiday lets | 100–400 m² | 10–40 kWp | 8,800–35,200 kWh | Retail HVAC, EV charging |
Yields calculated at 880 kWh/kWp — average UK irradiance. Actual yield varies by location (SW England +12%, Scotland −8%).
Roof Types and Mounting Systems
Profiled Steel / Fibre Cement Sheets
The most common agricultural roof material. Interlocking hook-and-clamp mounting systems attach directly to the roof purlin without penetrating the cladding sheet, making installation fast and weatherproof. Trapezoidal and IBR profiles are both accommodated. Load-bearing capacity must be verified by a structural engineer for older portal frame buildings — typical requirement is 12–15 kg/m² for panels plus racking.
Asbestos Cement Roofs (ACM)
Approximately 40% of UK farm buildings pre-1990 have asbestos cement roofing. You cannot drill through ACM under the Control of Asbestos Regulations 2012. The two compliant options are: (1) replace the ACM sheets with steel cladding as part of the solar project — the combined cost qualifies for AIA; (2) use non-penetrating ridge-clamp systems that attach to purlin apexes. We project-manage ACM replacement regularly and can handle the disposal licencing.
Flat Roofs (Timber or Concrete Portal)
Ballasted east/west tilt frames (10–15°) eliminate roof penetrations entirely, though they reduce yield by 5–8% compared with south-facing pitched installations. Structural load for ballasted systems is typically 20–30 kg/m² and must be verified by a structural engineer.
Permitted Development and Planning Policy
Most farm roof-mounted solar installations fall within Permitted Development rights under Schedule 2, Part 6, Class A of the Town and Country Planning (General Permitted Development) (England) Order 2015. The key thresholds are:
- Total installed capacity must not exceed 1 MWp per agricultural unit
- Panels must not extend beyond the plane of the roof
- The building must be in lawful agricultural use
- The installation must not be on a listed building or within its curtilage
- In Wales, Planning Policy Wales 12 (PPW12) provides equivalent PD rights with similar thresholds
Ground-mounted arrays above 9m² require a Prior Approval application — a lighter-touch process than full planning but still subject to siting and visual impact assessment. Systems in National Parks, AONBs, or Conservation Areas always need full planning permission regardless of size.
Get a Farm Solar Survey
Our MCS-certified surveyors visit your site, assess roof structure, load capacity, grid connection, and shading. No obligation — we provide a detailed written proposal within 5 working days.
Book Free Farm SurveyGrid Connection: G99 and DNO Requirements
Any system above 3.68 kWp per phase (single-phase) or 11.04 kWp (three-phase) requires notification to your Distribution Network Operator (DNO). Farm systems are almost always three-phase and above these thresholds, so a G99 application is standard. The process has three stages:
- Initial connection enquiry — submitted to your DNO (NGED, SPEN, ENWL, UK Power Networks, Western Power, SSEN). Free, response within 20 working days.
- Offer and acceptance — DNO issues a connection offer with costs (often nil for farms already connected at HV); you accept and pay connection fee if applicable.
- Protection settings commissioning — your MCS installer programmes the inverter protection relay to DNO specification and witnesses commissioning jointly with DNO.
Timeline: allow 6–12 weeks for G99 from application to approval. We manage the full DNO application process as part of every farm installation contract, and we have established working relationships with all 14 UK DNOs.
Battery Storage Integration for Farms
Battery energy storage systems (BESS) dramatically improve the economics of farm solar by storing surplus midday generation for use during evening milking sessions, early morning grain loading, or overnight refrigeration. The most popular chemistry for agricultural BESS is lithium iron phosphate (LFP) — non-toxic, thermally stable, and rated for 4,000–6,000 cycles (10–15 years at daily cycling).
| Battery Size | Suitable For | Evening Coverage | Approx. Cost |
|---|---|---|---|
| 30 kWh | Small dairy / workshop | 3–4 hrs evening demand | £12,000–£15,000 |
| 60 kWh | Medium poultry / mixed farm | Full evening milking session | £22,000–£26,000 |
| 100 kWh | Large intensive unit | Overnight cold store support | £35,000–£42,000 |
| 200 kWh+ | Large arable estate / processing | Full overnight operation | £65,000–£80,000 |
BESS costs include inverter-charger, BMS, installation, and commissioning. All qualify for AIA first-year tax relief.
Agrivoltaics: Solar Panels Over Crops
Agrivoltaics — combining solar generation with active crop production on the same land — is an emerging area of significant interest to large arable operations. Research by the National Institute of Agricultural Botany (NIAB) has demonstrated that certain crops, including leafy vegetables, soft fruit, and root vegetables, show neutral or positive yield impacts when grown under panels raised to 2.5–4m height, benefiting from reduced water stress and moderated temperature extremes.
Ground-mounted agrivoltaic arrays of 1–5 MWp typically require full planning permission and an EIA screening. They are most viable on Grade 3b or lower agricultural land where the farming income is marginal. We work with specialist agrivoltaic designers for enquiries in this space — contact us to discuss feasibility.
Case Study: 150kWp Poultry Unit, Lincolnshire
A family-run broiler enterprise in Lincolnshire with two 40,000-bird sheds installed a 150kWp south-facing array across both roofs in March 2025. The project scope included:
- 152 × 395Wp JA Solar Mono PERC panels on steel hook-and-clamp racking
- 2 × 75kW SMA Sunny Tripower CORE2 inverters (three-phase)
- G99 application to NGED Midlands — approved in 8 weeks
- No battery storage — ventilation fans run continuously during daylight hours, self-consumption exceeds 85%
- AIA claimed on full £108,000 installation cost, saving £27,000 in Corporation Tax
After 12 months of operation, the system has generated 138,750 kWh, offsetting 93% of daytime electricity consumption. Electricity cost savings: £30,500 at 22p/kWh average. SEG export revenue: £1,600. Net first-year return: £32,100 on an effective after-tax cost of £81,000 — payback of 2.5 years.
Get a Farm Solar Quote
We install on farms across England, Wales, and Scotland. Our agricultural solar team understands DNO connection, ACM roofs, PD rules, and AIA compliance.
Request Farm Solar QuoteRelated Agricultural Solar Pages
Explore our detailed guides for specific farm building types:
- Solar Panels for Farm Barns — mounting options, structural loads, ACM roofs
- Solar Panels for Grain Stores — dryer integration, load sizing
- Solar Panels for Poultry Buildings — ventilation matching, welfare compliance
- Solar Panels for Dairy Farms — milking load offset, BESS for night sessions
- Solar Panels for Pig Buildings — heating integration, three-phase sizing
Frequently Asked Questions
What size solar system does a farm need?
Farm system sizes range from 30kWp for a small mixed holding to 500kWp+ for an intensive poultry or pig unit. The key driver is roof area and daytime energy demand: grain dryers, refrigeration, milking machines, and ventilation fans all consume large amounts of power during daylight hours, making on-site solar a natural fit. A 100kWp system covering a typical grain store roof will generate roughly 88,000 kWh per year in the UK Midlands.
Does a farm solar installation need planning permission?
Most roof-mounted farm solar installations qualify as Permitted Development under Class A (agricultural buildings) provided the system does not exceed 1MWp total capacity and does not extend beyond the roof plane. Ground-mounted systems over 9m² do require a prior approval application, and any installation within a National Park, AONB, or World Heritage Site needs full planning consent. Wales follows Planning Policy Wales which has similar PD thresholds. Always check with the local planning authority before proceeding.
What grants are available for farm solar in 2026?
The primary incentives are the Annual Investment Allowance (AIA) — which gives 100% first-year tax relief on the full capital cost — and the Smart Export Guarantee (SEG), paying 3–6p per kWh for surplus exported electricity. The Rural Payments Agency and AHDB no longer offer capital grant support for solar directly, but solar systems that reduce carbon per unit of output can contribute positively to Countryside Stewardship scoring. Northern Ireland farmers can access the NIEA Rural Development Programme grant stream, and Scottish farmers may apply to Business Energy Scotland for larger systems.
How long does it take to install solar panels on a farm?
A standard 50–100kWp barn roof installation takes 3–5 days on-site for a competent MCS-certified team. Larger ground-mounted systems of 250kWp+ typically require 2–3 weeks including civil works. The biggest time variable is the DNO grid connection: a G99 application for systems above 50kWp can take 6–12 weeks with National Grid ESO and your regional DNO (NGED, Scottish Power, UK Power Networks, etc.). Planning ahead for the G99 notification is the most common source of project delay.
Can I install solar on a barn with an old asbestos cement roof?
Asbestos cement roofs require specialist handling under the Control of Asbestos Regulations 2012. You cannot drill through ACM sheets without a licensed contractor. However, there are two viable routes: (1) full ACM roof replacement with metal cladding as part of the solar project — this cost can be included in the AIA claim; or (2) non-penetrating standing seam clamps that attach to the roof purlin ridge without drilling. We can advise on both options during the site survey.
What is the return on investment for farm solar?
Payback periods for farm solar typically run 5–8 years depending on system size, energy tariff, and proportion of on-site consumption. A 100kWp system costing £75,000 installed on a poultry unit consuming 250,000 kWh/year will generate approximately £22,000 per year in avoided electricity costs (at 22p/kWh) plus £2,200/year in SEG export revenue — giving payback in under 3.5 years with AIA applied to the first year. Over 25 years the same system generates a net benefit of approximately £450,000 at modest 3% electricity inflation.
Do solar panels affect my agricultural tenancy?
If you are a tenant farmer, you must obtain the landlord's written consent before installing any permanent fixture including solar panels. The Agricultural Tenancies Act 1995 (FBT tenancies) and the Agricultural Holdings Act 1986 (AHA tenancies) both contain provisions about fixtures and improvements. In most cases landlords are supportive as solar panels increase the productivity and appeal of agricultural buildings, but a formal consent letter should be obtained and the farm business tenancy reviewed for any specific exclusions.
How does solar work with milking parlour electricity demand?
Modern robotic milking systems (e.g., Lely Astronaut, DeLaval VMS) draw 15–25 kW continuously during operation. A 50kWp rooftop system on a dairy shed can offset the majority of daytime milking demand while also supplying water heating and refrigeration compressors. Battery storage of 50–100 kWh can extend solar coverage to early morning and evening milking sessions, displacing peak-rate grid electricity. We size each dairy installation around the herd size, milking schedule, and grid tariff structure.
Quick Answer
Do solar panels qualify for FETF grant funding on farms?
Yes — solar panels for agricultural buildings qualify under the Farming Equipment and Technology Fund (FETF). Grant rates of 25% of equipment cost (up to £25,000 maximum per application) are available for solar panels used on farm buildings. The FETF grant covers the panel and mounting equipment but not inverters or electrical installation costs. Applications open in periodic rounds via the Rural Payments Agency. Combined with AIA tax relief, total effective savings can reach 45–50% of gross cost.
Agricultural Solar in 2026: Why Farm Installations Are Accelerating
UK farm electricity costs have risen 180% since 2021. For an average 500-acre arable farm with a grain drying facility, annual electricity costs now reach £25,000–£45,000. A 100kWp solar system — the typical size for a medium agricultural holding — can offset 60–80% of that bill, with a payback of 4–7 years before any grant support.
Three policy changes since 2023 have accelerated farm solar: (1) Class R permitted development now allows ground-mounted agricultural solar up to 1MW without full planning permission on land that doesn't meet the best and most versatile agricultural land threshold; (2) FETF grants provide capital relief on panel equipment; (3) AIA (Annual Investment Allowance) at £1M means virtually all farm solar investments achieve a 25% tax deduction in Year 1.
Farm Type Solar Sizing Reference
| Farm Type | Main Energy Load | Recommended System | Annual Saving |
|---|---|---|---|
| Dairy (250 cow) | Milking, cooling, ventilation — 280,000 kWh/yr | 150–250kWp | £27,000–£45,000 |
| Poultry (50,000 birds) | Heating, ventilation, lighting — 400,000+ kWh/yr | 200–500kWp | £36,000–£90,000 |
| Arable (500 acres) | Grain drying, cold store, workshop — 120,000 kWh/yr | 50–120kWp | £11,000–£22,000 |
| Pig (500 sows) | Heating, ventilation — 200,000 kWh/yr | 100–200kWp | £18,000–£36,000 |
| Mixed holding | General farm + residential — 80,000 kWh/yr | 40–100kWp | £7,000–£18,000 |
Agricultural Solar Planning: Class R Permitted Development
Class R of the General Permitted Development Order (GPDO) allows the installation of ground-mounted solar panels on agricultural land under permitted development rights, subject to conditions:
- The solar equipment must be reasonably necessary for agricultural purposes or the generation of electricity for the farm
- The ground-mounted array must not exceed 1MW installed capacity
- The land must not be scheduled monument, listed building, or within an SSSI where the development would have an adverse effect
- Prior approval from the LPA is still required for ground-mounted arrays — but this is a lighter-touch process than full planning permission
- Building-mounted solar on agricultural structures generally falls under Class A (commercial) or Class B (industrial), with simpler permitted development rights
For farms in National Parks, AONBs, or with Grade 1/2* listed buildings, we advise on the planning route case-by-case. Our agricultural solar planning guide covers the full decision tree.
Get a free agricultural solar survey
Our farm solar specialists understand FETF grant applications, Class R planning, rural DNO connection (often different from urban), and the specific energy profile of each livestock type. Book a free farm survey today.
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