Solar Panels for Grain Stores UK | Arable Farm Energy Guide

Grain stores are among the most commercially attractive candidates for agricultural solar in the UK. Large south-facing roofs, high peak electricity demands during harvest, and significant drying loads that can be offset by solar generation make grain store solar one of the fastest-payback agricultural applications. In the major arable regions — Lincolnshire, East Anglia, Yorkshire, Hampshire, and Wiltshire — grain store solar is now standard practice among progressive farming businesses.

Why Grain Stores Are Ideal for Solar

Several characteristics make grain stores particularly well-suited for solar installation:

• Large roof area: Modern wide-span grain stores typically offer 500–2,000m2 or more of south-facing roof space, sufficient for systems of 75kW to 300kW+

• Harvest-season alignment: Solar generation peaks in July–September, coinciding precisely with grain drying demand — maximising self-consumption and reducing grid imports during the highest-cost period

• Simple buildings: Steel portal frame grain stores have simple roof structures well-suited to solar mounting, without the complexity of older agricultural buildings

• Flat surroundings: Most grain stores are located in open farmyards with minimal shading from trees or other structures

System Sizing for Grain Drying Loads

The key to maximising the value of grain store solar is matching system size to your drying energy profile. A 100kW continuous flow dryer running at full capacity consumes approximately 100–150kWh per hour — equivalent to around 750kW of panel capacity to offset during peak sunshine hours. In practice, most grain store installations are 75kW–250kW, offsetting 20–50% of harvest drying loads directly while also providing year-round savings on farm base loads.

We analyse half-hourly meter data from your farm to identify peak drying periods and size the system to maximise the proportion of drying energy sourced from solar. A battery storage system can further increase self-consumption by storing midday generation for use during evening and night drying runs.

Structural Considerations for Wide-Span Steel Buildings

Modern grain stores — typically portal frame buildings constructed from the 1990s onwards — have well-documented structural specifications and are straightforward to assess for solar loading. Key considerations include:

• Purlin spacing and load capacity: Solar panel frames attach to roof purlins. Standard 1.2m purlin spacing accommodates most panel mounting systems without additional structure. Wider spacing may require additional rails.

• Panel weight per m2: Modern glass-glass or glass-backsheet panels weigh 10–15kg/m2. Most grain store roofs are designed to carry snow loads of 60–100kg/m2, so panel loading is typically within structural limits.

• Roof sheeting condition: Older box-profile steel sheeting from the 1970s–1980s may be corroded, particularly around fixings. Our structural surveyors assess sheeting condition as part of the standard site survey.

• Ridge and eave details: The installation design must account for the building’s ridge capping, gutters, and down-pipe arrangement to ensure weathertightness.

Regional Spotlight: Where Grain Store Solar Thrives

Lincolnshire leads the UK for grain store solar installations, driven by the county’s intensive arable character, large farm scale, and high average solar irradiance for an inland location. Boston, Sleaford, Spalding, and the Wolds are particularly active areas. The flat Lincolnshire landscape means minimal shading and excellent wind exposure for panel cleaning.

East Anglia — Norfolk, Suffolk, and Cambridgeshire — is the UK’s most solar-active agricultural region, with high irradiance, large farm scales, and a long tradition of early technology adoption. Sugar beet and vegetable processing farms alongside cereal operations generate significant year-round energy loads.

Yorkshire (East and North Riding particularly) has seen rapid growth in grain store solar as the county’s arable acres have expanded and grain drying capacity has increased. Hull and the Humber ports serve as grain export hubs, creating large-scale storage demand near major distribution centres.

Hampshire and Wiltshire have the UK’s highest average solar irradiance for agricultural counties, making the South-West’s chalk downland arable farms among the most financially attractive candidates for solar investment.

Costs and ROI for Grain Store Solar

A typical 100kW grain store solar installation costs £70,000–£90,000 before grants (2026 prices). With FETF grant funding covering up to 40% of eligible costs, the net investment falls to approximately £42,000–£54,000. Annual electricity savings typically range from £15,000–£30,000 depending on energy prices and drying intensity, giving payback periods of 2–4 years — among the fastest in UK agriculture.

Larger systems of 250kW+ can achieve even faster payback where the grain store’s energy profile is well-matched to solar generation patterns and battery storage is included.

For a detailed cost breakdown, see our agricultural solar panel cost guide.

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