How Much Does It Cost to Install Solar Panels on a Farm?

By Solar Panels For Farms UK · 12 April 2026

The cost of installing solar panels on a farm in the UK in 2026 typically ranges from £15,000 for a small 10kW system to over £350,000 for a large 500kW installation. The average cost per kilowatt (kW) for agricultural solar systems falls between £750 and £1,100, depending on system size, building type, and installation complexity. Larger systems consistently deliver a lower cost per kW, making farm solar one of the most economically attractive renewable investments available to agricultural businesses.

This guide provides a complete cost breakdown by system size, explains the factors that affect price, identifies hidden costs that catch farmers out, outlines the grants that can reduce your outlay by up to 40%, and calculates realistic return on investment timelines for different farm types. If you are asking “how much does it cost to install solar panels on a farm?” — this page gives you the direct, transparent answer.

For a quick estimate tailored to your specific farm, our farm solar cost calculator provides instant indicative pricing based on your building size and energy usage. For the full pricing framework including battery storage and finance options, visit our dedicated pricing page.

Farm Solar Panel Costs by System Size (2026)

The following cost table reflects current UK market prices for fully installed agricultural solar systems including panels, inverters, mounting systems, electrical works, and commissioning. These are net costs before any grant support.

10kW system (approx. 22 panels): £8,500-£12,000 | Cost per kW: £850-£1,200 | Suits: smallholdings, farm offices, workshops
25kW system (approx. 55 panels): £19,000-£27,000 | Cost per kW: £760-£1,080 | Suits: small dairy units, farm shops, equestrian centres
50kW system (approx. 110 panels): £37,000-£52,000 | Cost per kW: £740-£1,040 | Suits: medium livestock farms, mixed holdings
100kW system (approx. 220 panels): £72,000-£95,000 | Cost per kW: £720-£950 | Suits: large dairy units, arable farms, poultry houses
200kW system (approx. 440 panels): £140,000-£185,000 | Cost per kW: £700-£925 | Suits: large arable holdings, multiple-building farms
300kW system (approx. 660 panels): £205,000-£270,000 | Cost per kW: £685-£900 | Suits: estate farms, large mixed operations
500kW system (approx. 1,100 panels): £330,000-£425,000 | Cost per kW: £660-£850 | Suits: large estates, multi-building complexes, intensive operations

These figures represent the full installed cost for roof-mounted systems on agricultural buildings in good structural condition. Ground-mounted systems typically add 10-15% to these costs due to the additional civil works, mounting infrastructure, and planning application requirements.

What Affects the Cost of Farm Solar?

The cost per kilowatt for agricultural solar varies by up to 40% between projects. Understanding the factors that drive this variation helps you evaluate quotes accurately and identify where savings can be made.

System Size

Economies of scale are significant in agricultural solar. A 200kW system does not cost twice as much as a 100kW system — the cost per kW decreases as system size increases because fixed costs (scaffolding, electrical infrastructure, design, project management, grid connection) are spread across more panels. This is why larger farms consistently achieve better per-kW pricing.

Roof Condition and Type

A modern steel-clad portal frame building in good condition is the cheapest building type to fit with solar. Older buildings requiring structural reinforcement, asbestos over-roofing, or cladding replacement will add £10,000-£50,000 or more to the project cost depending on the scale of work required. However, these additional costs can often be justified by the dual benefit of a new roof and a solar installation, and in many cases the entire project — including re-roofing — still delivers a payback period under 8 years.

Electrical Infrastructure

The existing electrical infrastructure on the farm affects cost significantly. If the farm already has a three-phase supply with adequate capacity, the solar system can typically be connected with minimal upgrade work. If the supply needs upgrading — from single-phase to three-phase, or from a small three-phase supply to a larger one — this can add £3,000-£15,000 to the project. For larger systems (above 50kW), G99 grid connection applications to the Distribution Network Operator are mandatory and can involve network reinforcement charges, particularly in areas with constrained grid capacity.

Location and Access

Farm buildings in remote locations with difficult access can increase installation costs by 5-10% due to transport, accommodation, and logistics. Conversely, farms close to major roads and urban centres may benefit from shorter travel times and lower labour costs. The distance from the installer’s base is a real factor in pricing — choosing a regionally based agricultural solar specialist usually delivers better value than a national company travelling long distances.

Panel and Inverter Choice

The choice of panels and inverters affects both the upfront cost and the long-term performance. Tier 1 panels from established manufacturers (JA Solar, Longi, Canadian Solar, Trina) typically cost £100-£170 per panel at agricultural scale. Premium panels (SunPower, REC Alpha) command a 15-25% premium but offer higher efficiency and longer warranties. Inverter choice between string inverters and microinverters also affects cost, with string inverters being the standard for agricultural installations due to lower cost per kW.

Hidden Costs to Watch For

Farm solar projects sometimes encounter costs that were not anticipated at the quotation stage. Being aware of these helps you ask the right questions before committing.

Asbestos surveys and management: If the building’s roof material has not been tested, an asbestos survey (£200-£500) is an essential first step. If asbestos is confirmed, over-roofing or removal adds substantially to costs.
Structural engineering reports: Some installers include this in their quotation; others charge separately (£500-£1,500). Confirm what is included.
Grid connection charges: For systems above 50kW, DNO charges for G99 connection can range from zero to £30,000+ depending on local grid capacity. Your installer should provide an estimate based on their experience in your area.
Scaffolding and access equipment: Most agricultural installations use cherry pickers or MEWPs rather than scaffolding, but some building configurations require scaffold, which adds £2,000-£8,000.
Trenching for ground-to-building cabling: If the inverter or meter is in a different building from the panels, trenching for AC/DC cabling may add £1,000-£5,000.
Planning application fees: If planning permission is required (not covered by permitted development), the application fee is £462 plus any supporting documentation costs.

A reputable agricultural solar installer will identify all of these potential costs during the initial site assessment and include them transparently in their quotation. If a quote seems surprisingly low, check what has been excluded. For guidance on what to look for in a farm solar quote, see our agricultural solar panel cost page.

Grants That Reduce the Cost of Farm Solar

UK farmers have access to several grant schemes that can reduce the upfront cost of solar by 25-40%. Understanding and accessing these grants is one of the most important steps in making farm solar financially viable. Our comprehensive grants page provides full details of every available scheme, but the key programmes are summarised here.

Farming Equipment and Technology Fund (FETF)

The FETF provides grants of up to £100,000 covering 40% of eligible solar installation costs. This is the most widely used grant for agricultural solar in England. Application windows open periodically — typically with 6-8 weeks notice — and require a detailed specification and quotation from an MCS certified installer. Competition is strong, so early preparation and a well-documented application are essential.

Countryside Stewardship Capital Grants

Farms enrolled in Countryside Stewardship Mid-Tier or Higher-Tier agreements can access supplementary capital grants of up to £50,000 for solar installations that complement their environmental objectives. This is particularly relevant for farms incorporating biodiversity features into solar installations — for example, pollinator margins around ground-mounted arrays.

Devolved Nation Schemes

Scottish, Welsh, and Northern Irish farms have access to dedicated grant programmes with different eligibility criteria and funding levels. The Scottish Rural Development Programme provides grants up to £500,000 for renewable energy projects, while the Welsh Farm Business Grant covers £12,000-£100,000 per project.

The net cost after grant support transforms the economics of farm solar. A £95,000 100kW system with a 40% FETF grant becomes a £57,000 investment — with a payback period typically dropping from 7 years to under 5 years.

Finance Options Beyond Grants

Not all farmers want to — or can — fund solar through capital purchase, even with grant support. Several finance options are available that allow farms to benefit from solar without large upfront expenditure.

Agricultural loans: Many agricultural lenders (AMC, Lloyds Agriculture, Barclays Agriculture) offer dedicated renewable energy loans at competitive rates, typically 4-7% over 7-15 years. Monthly repayments are often less than the electricity savings from day one.
Hire purchase: Similar to agricultural machinery HP agreements, solar HP allows the farm to own the system outright at the end of the term while spreading payments over 5-10 years.
Power Purchase Agreements (PPAs): Under a PPA arrangement, a third party funds, installs, and maintains the solar system on your building. You buy the electricity at an agreed rate (typically 20-40% below grid price) with no upfront cost. The system reverts to farm ownership after 20-25 years.
Leasing: Similar to PPAs but structured as a roof lease. The farm receives a rental payment for the roof space, and the third party sells the electricity. Returns are lower than self-funded solar but involve zero capital risk.

Return on Investment by Farm Type

The speed at which a farm solar system pays for itself depends primarily on the farm’s electricity consumption, self-consumption rate, and the proportion funded by grants. The following ROI projections are based on 2026 electricity prices, current grant levels, and typical agricultural consumption patterns.

Dairy farms (80-150kW): High and consistent energy demand from milking, cooling, and water heating. Self-consumption rates of 60-75%. Typical payback: 5-7 years with grants, 7-9 years without.
Arable farms (100-250kW): Seasonal energy demand heavily weighted to harvest. Self-consumption rates of 40-55% without battery, 55-70% with battery. Typical payback: 6-8 years with grants, 8-11 years without.
Poultry farms (100-250kW): Constant high energy demand for ventilation, heating, and lighting. Self-consumption rates of 60-80%. Typical payback: 4-6 years with grants, 6-8 years without.
Mixed farms (50-100kW): Diverse energy demands across multiple enterprises. Self-consumption rates of 50-65%. Typical payback: 5-7 years with grants, 7-10 years without.

After the payback period, the electricity generated by the solar system is effectively free for the remaining 17-22 years of the system’s warranted life. At current electricity prices, a 100kW system generating 95,000 kWh per year provides electricity worth £26,000-£33,000 annually — a substantial ongoing benefit to the farming business.

Capital Allowances and Tax Benefits

Farm solar installations qualify for 100% Annual Investment Allowance (AIA), meaning the full cost of the system can be deducted from taxable profits in the year of installation. For a higher-rate taxpayer, this effectively reduces the net cost by up to 40% on top of any grant support received. The combined effect of grants and capital allowances can reduce the effective cost of a solar installation by 55-65%. For a full explanation of the tax treatment, see our capital allowances for farm solar guide.

Getting an Accurate Quote for Your Farm

The most reliable way to establish the cost of solar for your farm is to request a site-specific quotation from a specialist agricultural solar installer. A credible quote will be based on a physical site visit (not just satellite imagery), a structural assessment of your building, an analysis of your actual electricity consumption, a review of available grant schemes, and detailed yield modelling for your specific location and roof orientation.

Be wary of ballpark quotes provided without a site visit — agricultural installations are too variable for accurate remote pricing. The best installers will provide a comprehensive proposal including detailed costings, projected energy yield, financial modelling, and grant application support.

For a no-obligation discussion about costs for your specific farm, contact our team and we will connect you with a specialist installer in your region. You can also explore current pricing benchmarks on our agricultural solar cost page.

Frequently Asked Questions

What is the average cost per kW for farm solar in 2026?

The average cost per kilowatt for agricultural solar installations in the UK in 2026 ranges from £660/kW for very large systems (500kW+) to £1,200/kW for small systems (10kW). The most common farm installations (50-200kW) typically fall in the £720-£950/kW range. These costs include panels, inverters, mounting systems, electrical works, and commissioning.

How much can a farm save with solar panels?

A typical 100kW farm solar system generating 95,000 kWh per year saves £20,000-£30,000 annually in electricity costs, depending on the proportion consumed on-site versus exported to the grid. Over a 25-year system life, total savings typically exceed £400,000 for a system costing £72,000-£95,000 to install.

Are there any ongoing costs after installation?

Ongoing costs are minimal. Annual maintenance and cleaning costs £300-£800 per year for a typical farm system. Inverter replacement may be required after 10-15 years, costing £3,000-£8,000 depending on system size. Insurance can usually be added to your existing farm policy for a modest premium. Total lifetime maintenance costs are typically 5-8% of the initial installation cost.

Can I get 0% VAT on farm solar panels?

Solar panel installations on agricultural buildings are currently subject to 20% VAT, unlike domestic installations which benefit from 0% VAT. However, VAT-registered farming businesses can reclaim the VAT through their normal VAT returns, making the effective VAT cost zero for most farms. Non-VAT-registered smallholdings and hobby farms will pay the full 20% VAT.

Is it cheaper to install solar panels on one large building or several small ones?

Installing on one large building is almost always cheaper per kW than distributing the same capacity across multiple smaller buildings. The reasons include lower cabling costs, fewer inverter locations, simpler electrical design, and reduced installation labour. However, spreading panels across multiple buildings can improve self-consumption if different buildings have different energy demand profiles. Your installer will model both options and recommend the most cost-effective approach.

Get a precise cost estimate for your farm. Contact Solar Panels For Farms UK for a free, no-obligation site assessment and quotation from an MCS certified agricultural solar specialist.

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