Solar Panels for Farms in London

An independent guide to solar on farms in London and the wider Greater London area, including Essex, Kent, Surrey: what it costs, the planning rules, the grid and the funding position, from official sources.

Agricultural solar panels in London

Agricultural solar panels in London serve a farming economy that almost no one outside the outer boroughs realises exists. Strip away the centre and Greater London still holds thousands of hectares of working land on its Metropolitan Green Belt — equestrian yards and livery stables across Havering and Bromley, glasshouse nurseries and market gardens in the Lea Valley around Enfield, fruit and salad growers in the Crane and Colne valleys near Hillingdon, grazing and small arable blocks out toward the M25 fringe, and a dense ring of city farms run for education and community food. These holdings sit on some of the most expensive land in Britain, which makes every fixed overhead — and electricity is one of the biggest — worth attacking hard. Glasshouses run propagation lighting and frost protection through winter, livery yards pump water and run wash-down and arena lighting year round, and refrigeration on a market-garden packhouse runs flat out through the salad season. That is exactly the steady daytime demand a rooftop array is built to offset.

The economics in London are strong because the grid here is dear and the roofs are large. UK Power Networks (UKPN) is the Distribution Network Operator for all of Greater London, and import tariffs across the capital sit among the highest in the country, so every unit a farm self-generates displaces a unit it would otherwise buy at a premium. Southern England irradiance of roughly 1,000–1,100 kWh per kWp a year means a well-pitched south-facing barn, glasshouse plant room or stable block generates predictably, and a 30–50kW array on a livery yard or nursery typically covers a large share of daytime load. For reference, DESNZ’s Solar PV cost data for 2025/26 put the median installed price of a 10–50 kW system in Great Britain at £1,262 per kW (including VAT where charged, excluding batteries), and payback depends on how much of the output the farm uses itself. Our agricultural solar panel cost breakdown shows how the numbers fall by system size.

Farm solar across London by district

The right system size depends entirely on what the holding does and how much power it draws in daylight. These are representative ranges for the farming-fringe districts that ring the capital.

Glasshouse and nursery holdings in the Lea Valley sit at the top of the size range — their winter lighting and refrigeration load means they consume a large share of generation on site rather than exporting it, which is where solar economics are strongest. Equestrian and livery yards run smaller arrays, and arena lighting, water heating and yard infrastructure draw steadily through the working day.

Grants and tax relief for London farms

London farms are in England, so the funding position is the English one: no grant for solar panels on farms is open. Round 2 of the Improving Farm Productivity (IFP) grant paid up to 25% of eligible costs — for solar, £15,000 minimum to £100,000 maximum — for panels on farm-building rooftops or irrigation reservoirs only, not ground-based arrays; full applications closed on 31 July 2025 and no further round has been announced. The Farming Equipment and Technology Fund (FETF) 2026 window closed at midday on 12 May 2026, and its 2023–2026 item lists did not include solar panels to power a farm; Capital Grants 2026 and the Sustainable Farming Incentive have no solar items. Capital allowances do the heavy lifting on the panels themselves: solar panels are special-rate plant, and most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance, though a partnership with a company as a member cannot claim it. On the income side, the Smart Export Guarantee (SEG) pays for every surplus unit exported back through the UK Power Networks (UKPN) grid, at a rate each licensed supplier sets — relevant for Lea Valley nurseries whose summer generation can outstrip daytime demand on the brightest days.

Most outer-London holdings therefore rely on the AIA in year one and SEG on exported surplus, and any payback figure you are shown should be the real after-tax number, not a gross headline. Our grants and funding guide walks through the current status of each scheme for an agricultural business.

Planning and grid in London

Greater London has no National Parks, but it carries heavyweight planning designations that shape every ground-mount conversation: the Metropolitan Green Belt rings the entire capital, and there are protected landscapes and conservation areas across the outer boroughs. The good news for most farms is that the easiest route avoids those constraints entirely. Rooftop solar on an existing agricultural building — a barn, glasshouse plant room, stable block or packhouse — generally falls under permitted development rights for agricultural units, so the typical livery-yard or nursery roof install needs no full planning application, only the standard prior-approval checks where they apply. Ground-mounted arrays are the harder case: on Green Belt land, in a conservation area, or near a listed building, a field-scale ground mount will need a full planning application and a clear justification, so the default recommendation across London is roof-first wherever the structure allows.

On the grid side, UK Power Networks (UKPN) is the DNO for the whole of Greater London and every connection runs through its process. Arrays up to 3.68kW per phase can be fitted under the G98 notification route, while anything larger — which covers essentially every farm-scale system — needs a G99 application to UKPN before commissioning, with the connection terms confirming how much you can export. The installer normally handles the full G99 submission, the DNO liaison and the prior-approval paperwork as part of the install, so the holding gets a compliant, properly-certified connection without the owner chasing forms.

Typical London farm solar projects

These are representative London enterprise types and the system ranges they tend to land on — illustrative, not specific named installations.

Equestrian / livery yard (Havering, Bromley, Croydon). A 20–40kW roof array across a stable block and barn roofs covers arena lighting, water heating, wash-down pumps and yard infrastructure. Steady daytime self-consumption and high London import tariffs work in the yard’s favour.

Glasshouse nursery / market garden (Enfield, Lea Valley). A 40–100kW system on glasshouse plant rooms and packhouse roofs offsets propagation lighting, frost protection, refrigeration and packing-line load. Because nurseries consume so much of their own generation on site, these are among the strongest cases in London, with SEG income on exported summer surplus on top.

Salad and fruit grower (Hillingdon, Colne Valley). A 30–80kW array on packhouse and storage-shed roofs runs the cold chain that keeps produce saleable. Refrigeration is a constant daytime draw, so generation is consumed almost as fast as it is produced, insulating the business from grid-price volatility.

City farm / community holding (South & East London). A 15–30kW install on barn and outbuilding roofs cuts the energy bill of an education-focused holding while doubling as a visible sustainability asset for visitors and funders.

For costs by system size see what agricultural solar panels cost; for funding, farm solar grants and capital allowances; for the regional picture, farm solar by UK region.