Solar Panels for Farms & Agricultural Buildings

Why UK Farmers Are Installing Solar in 2026

UK farms face sustained pressure on margins — energy is one of the few controllable costs. Agricultural electricity tariffs averaged 28–34p/kWh in 2026, with some farmers on farm-specific business tariffs paying 30–38p/kWh. A single dairy farm with 300 cows can spend £45,000–£80,000 per year on electricity for milking, water heating, refrigeration, and ventilation. Solar directly offsets this — with daytime generation closely matching morning and evening milking periods.

England's farm-grant landscape changed in 2026: the Farming Equipment and Technology Fund (FETF) closed its final round on 28 April 2026 — and contrary to much of what is still published online, it was a fixed-rate equipment fund, never a percentage capital grant for solar. The live capital route is now the Improving Farm Productivity (IFP) grant at 25% of eligible costs. Combined with 100% first-year AIA tax relief, Class R permitted development rights (eliminating the need for planning permission on most farm buildings) and 25-year panel warranties, the case for farm solar remains strong.

Farm Solar Grants in 2026 — What Changed, and What's Live

England's live capital route is the Improving Farm Productivity (IFP) grant, administered by the Rural Payments Agency (RPA) under the Farming Investment Fund. It contributes 25% of eligible capital costs for productivity-boosting investments, including solar where it powers farm operations.

Key eligibility points for farm solar under IFP:

• You must be a registered farm business in England
• The solar system must primarily serve an agricultural purpose (powering farm buildings, milking equipment, grain drying, etc.) — not primarily commercial generation
• Applications open in competitive funding rounds — check the current RPA guidance before committing
• Scotland, Wales and Northern Ireland run separate schemes; across the UK, support typically runs 25–40% depending on nation and scheme

Whatever the grant position, the Annual Investment Allowance (100% first-year tax deduction) applies UK-wide — with AIA alone, typical farm solar payback is 2–4 years. Check current funding availability before you structure an application.

Farm Solar System Sizing by Type

Farm Type	Annual Electricity Use	Recommended System	Annual Saving*	Post-Grant Cost
Dairy Farm (200 cows)	120,000–180,000 kWh	50–80kWp	£13,500–£22,000	£28k–£55k
Dairy Farm (500+ cows)	250,000–400,000 kWh	100–200kWp	£27,000–£54,000	£54k–£131k
Poultry (50,000 birds)	300,000–500,000 kWh	100–250kWp	£27,000–£67,500	£54k–£164k
Pig Farm (500 sows)	200,000–350,000 kWh	75–150kWp	£20,000–£40,000	£41k–£98k
Arable (grain drying)	80,000–200,000 kWh	30–100kWp	£8,100–£27,000	£17k–£71k
Mixed Farm	100,000–250,000 kWh	40–100kWp	£10,800–£27,000	£23k–£71k

* Annual saving at 30p/kWh with 75% self-consumption. Post-grant cost assumes a 25% capital grant received (IFP in England, or national equivalent).

Class R Permitted Development for Farm Solar

Class R of the Town and Country Planning (General Permitted Development) Order 2015 allows certain changes of use and installations on agricultural land and buildings without requiring full planning permission. For solar panels on agricultural buildings, most installations qualify as permitted development subject to the following conditions:

• The solar panels are installed on an agricultural building, not on open land
• The agricultural unit is at least 5 hectares
• The system capacity does not exceed 1MWp
• The installation does not involve significant engineering works to the building
• The building is not listed or in a World Heritage Site

For installations on agricultural land (ground-mounted), rather than on buildings, different Class R rules apply with tighter size restrictions. Check permitted development eligibility for every project — where PD rights don't apply, the installer manages the full planning application process.

Farm Building Roof Types

Portal Frame Buildings (Fibre Cement / Tin Roofs)

The majority of UK farm buildings are steel portal frames with profiled metal or fibre cement sheet roofing. These are ideal for solar installation — clamp-mounted systems require no roof penetrations and can be installed quickly. Fibre cement (non-asbestos) roofing is the most common substrate and presents no specialist requirements.

Older Asbestos Cement (AC) Roofing

Many older farm buildings have asbestos cement sheet roofing. This is common on pre-1980 buildings and is not hazardous if undisturbed, but requires specialist handling for any penetration or attachment work. Installers can fit solar on AC roofs using clamp systems that avoid drilling — or overclad (installing new metal sheeting over the existing AC) which resolves both the asbestos and solar opportunity simultaneously.

Grain Store Flat Roofs

Modern grain stores often have flat or shallow-pitch polymer membrane roofs. These suit ballasted solar systems (no penetrations) and can accommodate larger system sizes per square metre of usable roof area than pitched roofs.

Agricultural Energy Profiles: Getting Solar Right by Farm Type

Dairy Farms

Dairy farms are the best-matched farm type for solar due to their consumption profile. Milking twice daily (6–8am and 4–6pm) aligns with solar generation in summer months. Additional loads include milk refrigeration (24/7), hot water for cleaning (morning and evening peaks), and parlour lighting. Typical dairy farm self-consumption rates: 70–85% — among the highest of any agricultural sector.

Poultry Houses

Modern poultry houses are substantial electricity consumers: ventilation fans, lighting programmes, heating during chick rearing, and automated feeding systems. Poultry houses run 24/7 during production cycles, making battery storage complementary to maximise solar use overnight. Large poultry sites with multiple houses often justify 200–500kWp+ systems.

Arable Farming

Arable farms have seasonal electricity demand peaks: grain drying in harvest (August–October) coincides with high solar generation in summer/early autumn, making alignment excellent. Outside harvest, electricity use is lower — battery storage can maximise solar value during low-demand periods.

Pig Farms

Pig buildings use electricity for ventilation, lighting, electric hoists, pressure washing, and heating for weaner accommodation. Load profiles are relatively consistent year-round. Solar offsets base load effectively, with typical self-consumption of 65–75%.

Smart Export Guarantee (SEG) for Farms

Any solar electricity you don't consume on-farm can be exported to the grid under the Smart Export Guarantee (SEG). SEG rates from Octopus Energy, E.ON, and others range from 4–20p/kWh. For farms with summer solar surplus (arable farms during pre-harvest periods), SEG provides meaningful additional revenue of £1,500–£8,000/year depending on export volume and chosen tariff.

To qualify for SEG, your system must be under 5MWp, MCS-certified, and have an export meter installed (check it is included in the installation). Compare SEG tariffs before registering — a good installer helps with registration.

Worked example (modelled): 210kWp Dairy Farm, Cumbria

Illustrative, modelled scenario — not a real project. This site is an independent publisher and holds no project data.

A representative profile for a 300-cow dairy farm: a 210kWp system across three farm buildings. Pre-solar electricity spend: £56,000/year. The system generates 186,000 kWh/year, with 83% self-consumed during milking and dairy operations. Annual electricity saving: £46,300. With a 25% capital grant, net project cost falls to around £138,000, giving a payback of roughly 3 years — before AIA tax relief improves it further.