Solar Grants for UK Farms 2026 | REPF & Full Expensing

Why solar pays back faster on UK farms than almost any other sector

UK agriculture has three structural advantages for solar economics. First, farms have abundant useful surfaces — barn roofs, dutch barns, parlour roofs, modern grain stores — many of which are south-facing and structurally rated for PV out of the box. Second, farms increasingly run high-electricity-demand processes — robotic milking parlours, ice-bank cooling, pack-house refrigeration, grain dryers, glasshouse heating, irrigation. Third, on most farms the operational profile is genuinely 7-day with significant daytime weighting, so self-consumption is naturally high.

The combination produces some of the shortest paybacks in UK commercial solar. Pre-grant, a typical 250 kWp on-farm install pays back in 5.8 to 6.8 years; with Rural England Prosperity Fund support and Full Expensing applied, that drops to 4.2 to 5.0 years. A handful of farms we work with have payback under four years where the load profile is exceptional — a 280-cow Holstein-Friesian dairy with three milking robots and a grain dryer, for example, hit a 4.1-year payback in 2024.

Where the funding comes from for UK agriculture

Three main routes apply to most farm projects.

Rural England Prosperity Fund (REPF). DEFRA programme delivered through local councils. £110m allocated through March 2025, with a successor programme expected. Covers up to 40% of eligible capex for rural enterprise capital projects. Most farm solar projects qualify. The application narrative should anchor on productivity and rural growth outcomes — jobs supported, contract revenue enabled, value-add to rural supply chains — not just decarbonisation.

Annual Investment Allowance and Full Expensing. For farms that are incorporated (an increasing share — about 35% of UK farms with annual turnover over £500k now operate as limited companies), Full Expensing gives 25p back on every £1 of solar capex via reduced corporation tax. Sole trader and partnership farms get AIA only — still 100% first-year relief but capped at £1m of plant per year.

Smart Export Guarantee (SEG). Farms tend to have material export ratios — solar generation often exceeds farm demand on weekends and through the May–August generation peak. The right SEG tariff materially affects payback. Octopus Outgoing Agile and EDF Export Variable have been the strongest SEG products for farms in 2025/26.

For larger projects, Power Purchase Agreements are increasingly common. A PPA funder pays for and owns the solar; the farm signs a 20-year agreement to buy power at a fixed pence/kWh rate. PPAs work well on farms with 100kW+ demand and stable tenure. Tenant farmers and short-lease holdings often can’t access PPAs because of the 20-year horizon required.

Sub-sector fit

Dairy farms. Excellent fit. Robotic milking, ice-bank cooling and continuous parlour load combine to give 70–85% self-consumption on properly sized systems. Most dairy projects we deliver are 200–400 kWp.

Poultry. Good fit, especially broiler producers with controlled-environment houses running ventilation and lighting on continuous schedules. Egg-laying houses with LED lighting transitions are particularly favourable. Watch DNO connection costs for very large operations — high-density poultry can have peak demand exceeding standard 3-phase connections.

Arable. Variable. Grain drying creates a strong August–October peak that may exceed roof-array capacity, making batteries or oversizing useful. On the rest of the year, low electricity demand means high export ratios — the SEG tariff matters more than for dairies.

Horticulture / glasshouse. Strong fit when there is roof or adjacent ground space. The challenge is glasshouse roof itself — most glasshouses cannot take PV — so projects use packing-shed roofs or ground-mount on adjacent paddocks.

Mixed farms. Often the easiest projects to fund because the productivity outcomes (multiple supported enterprises) suit REPF scoring. We often integrate solar with EV charging for milk tanker and feed lorry visits.

Roof-mount vs ground-mount

The default on UK farms is roof-mount on existing barns and parlours. Roof-mount has lower planning friction (most barns are deemed permitted under permitted development rights for solar up to 1 MW), no grid-connection upgrade for systems under 250 kW typically, and faster install timelines.

Ground-mount becomes the right answer when (a) the farm has more than 500 kW of demand to serve and not enough roof, (b) the roof is unsuitable structurally (asbestos, steel-cement composite, or pre-1990 portal frame without bracing capacity), or (c) the farm has unproductive corner ground that would benefit from being put under PV. Ground-mount projects typically run 1 to 5 hectares for £400k to £1.6m capex.

Planning is more involved for ground-mount. Sub-1MW projects are usually classed as Class A development (do not require full planning permission for permitted development purposes). Above 1MW you are into Class A 50 MW threshold rules — but for most farm-scale projects this is irrelevant.

REPF application strategy for farms

Local councils administer REPF and the scoring criteria vary. The common thread: REPF is a rural growth fund, not a decarbonisation fund. Successful applications anchor on outcomes the council’s economic development team cares about — jobs, GVA, rural enterprise diversification, supply chain effects.

A weak REPF application reads “we will save 142 tCO2e/year and reduce our energy bills by £42,000”. A strong one reads “the £42,000 saving allows us to offer competitive contract grain drying for two neighbouring farms, supporting two new seasonal jobs and £180,000 of additional rural enterprise revenue annually, while saving 142 tCO2e”.

Some councils have allocated REPF preferentially to specific themes. North Yorkshire prioritises productivity-anchored rural enterprise. Cornwall has favoured tourism-linked rural businesses. Cumbria has given more weight to landscape-sensitive heritage uses. Knowing the local angle is half the battle. We track every council’s REPF stance.

Tenant farmers and grant access

About 30% of UK agricultural land is tenanted, and tenant farmers face a structural problem with solar grants. Most grants and PPAs require 15–25 year asset tenure, and an Agricultural Holdings Act tenancy or Farm Business Tenancy may not give that. The workable routes are usually:

• Landlord-funded solar with a sub-lease back to the tenant, where the landlord owns the asset and benefits from the grant + tax relief, and the tenant buys solar electricity at a discount.
• A PPA where the funder takes a roof lease directly from the landlord and the tenant signs the off-take agreement.
• Short-term solar (10-year asset) on a portable mounting system — niche, but emerging for some glasshouse and poultry operations.

We have structured each of these for clients. If tenure is the issue, the funding conversation has to start with the landlord, not the tenant.

How to start

The funding review form takes four minutes; we come back within one working day with a costed shortlist. For farm projects the consultant on the call is usually Tom (our chartered engineer, who has personally modelled 60+ farm PV projects) or Priya (who has authored most of our REPF applications). The first conversation is free and there is no obligation.