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Aberdeenshire farms are among the best candidates for solar PV in Scotland. The combination of large unobstructed roof areas on agricultural buildings, high electricity consumption from grain drying, irrigation, water pumping, cold storage, and workshop machinery, and good solar irradiance across the region creates a compelling financial case that is often stronger than the equivalent domestic installation.
This guide covers what agricultural solar involves in Aberdeenshire, what system sizes and costs are typical for farm buildings, how battery storage improves the return, the relevant tax and business rates considerations, and what the MCS installation process involves for commercial agricultural properties.
Why farms are ideal solar sites
A typical Aberdeenshire farm building offers several advantages over a domestic roof installation.
Roof area: A grain store, machinery shed, or livestock building may have 200 to 1,000 square metres of roof area. This allows much larger systems than a domestic roof, typically 15kWp to 100kWp, generating correspondingly higher volumes of electricity. The marginal cost per kWp installed falls as system size increases, improving the economics of scale.
Daytime consumption: Farm electricity use is concentrated during the working day. Grain drying, milking, workshop machinery, and irrigation all run during daylight hours when solar generation is at its peak. Unlike a domestic property where much of the electricity demand falls in the evening after panels have stopped generating, a working farm consumes a large proportion of its electricity at exactly the times solar is producing it. Self consumption rates on farm installations are consistently higher than on domestic systems, often 60% to 75% without battery storage and 80% to 90% with it.
Roof orientation: Agricultural buildings frequently have long ridges aligned east to west, giving both a south facing and a north facing slope. The south facing pitch is ideal for solar panels. Many grain stores and portal frame sheds have a pitch angle of 10 to 20 degrees, which works well in Scotland’s climate and reduces the visual impact of panels from ground level.
System sizes and costs for Aberdeenshire farm installations
Farm solar systems are sized to match electricity consumption rather than to fill the available roof. Over-sizing a system relative to consumption increases the proportion exported to the grid at the lower Smart Export Guarantee rate, which reduces the financial return per kWp installed.
Typical Aberdeenshire farm annual electricity consumption by enterprise type:
- Arable farm (grain drying, irrigation, workshops): 20,000 to 80,000 kWh per year.
- Dairy farm (milking, refrigeration, heating): 60,000 to 150,000 kWh per year.
- Mixed enterprise with farm shop or processing: 40,000 to 120,000 kWh per year.
- Beef or sheep enterprise (smaller energy footprint): 10,000 to 30,000 kWh per year.
Indicative system sizes and installed costs for agricultural solar in Aberdeenshire in 2025 and 2026:
- 15kWp system: approximately £14,000 to £18,000 installed.
- 25kWp system: approximately £20,000 to £27,000 installed.
- 50kWp system: approximately £35,000 to £45,000 installed.
- 100kWp system: approximately £60,000 to £80,000 installed.
These figures assume a straightforward accessible roof installation on a portal frame agricultural building. Access equipment, complex roof structures, or distances between the array and the main electrical supply point can add cost. All figures are at 0% VAT, which applies to agricultural solar installations on buildings used for residential or charitable purposes; the VAT position on purely commercial agricultural buildings should be confirmed at the quote stage.
Battery storage for farm systems
Battery storage works well alongside farm solar systems for operations that have significant electricity demand in the evening or early morning outside solar generation hours. Cold storage that runs overnight, security and yard lighting, and electric vehicle or machinery charging that happens outside working hours are all use cases that benefit from battery storage.
For a 50kWp farm installation, a 30kWh to 50kWh battery system can store surplus afternoon generation for use in the early morning and evening. Battery systems at commercial scale generally offer better value per kWh than domestic systems. Faithful Spark installs GivEnergy and SolarEdge commercial battery solutions for agricultural clients alongside solar arrays.
For more on how battery storage improves the financial return from solar, see our guide on solar battery storage in Scotland.
VAT on agricultural solar
VAT on solar PV installations is subject to the end use of the building and the nature of the business. The position differs from domestic installations and it is important to get this right before signing a contract.
For agricultural buildings that form part of a farm business registered for VAT, the installation is generally a VAT qualifying business expenditure that can be recovered through the normal VAT return. The installer charges VAT on the supply (typically 20% on a commercial agricultural installation) and the farm business reclaims it as input VAT. The net cost is therefore the pre-VAT price.
Where the building is used for a mix of business and residential purposes, or where the farm business is not VAT registered, the position is more complex. Faithful Spark provides a VAT summary in every commercial quote and recommends confirming the position with your accountant before proceeding.
Capital allowances and tax relief
Solar PV installations on farm buildings qualify as plant and machinery for capital allowances purposes. Under the Full Expensing regime introduced in April 2023 and made permanent in the Autumn 2024 Budget, companies can deduct 100% of the cost of qualifying plant and machinery in the year of purchase. For unincorporated farm businesses, the Annual Investment Allowance provides 100% first year relief on expenditure up to £1,000,000 per year.
The practical effect is that a farm paying 25% corporation tax that installs a £50,000 solar system can claim a £12,500 tax deduction in the year of installation. For a sole trader or partnership in the 40% income tax band, the Annual Investment Allowance on a £50,000 system is worth £20,000. This tax relief is in addition to the energy cost savings from the electricity generated.
Confirmation of the precise allowances available should come from your accountant or tax adviser. Faithful Spark provides the documentation needed to support a capital allowances claim as part of every commercial installation.
Business rates on agricultural solar
Agricultural land and buildings are generally exempt from non domestic rates (business rates) in Scotland. Solar panels installed on an agricultural building that retains its agricultural use typically do not affect the rates position of that building. However, where a solar array is installed on a building that is no longer in active agricultural use, or where the scale of the solar installation is such that it constitutes a separate rateable hereditament, a business rates liability can arise.
In Scotland, the assessor for non domestic rates is the Scottish Assessors Association. For large ground mounted systems on agricultural land (which fall outside the scope of typical building mounted farm solar), a business rates assessment is likely. For roof mounted systems on working farm buildings, the position is generally favourable. Faithful Spark recommends confirming the rates position with your local assessor for systems above 50kWp.
Planning and permitted development for farm solar
The permitted development position for solar panels on agricultural buildings in Scotland is broadly similar to the domestic position for installations within the boundary of a working farm. Roof mounted panels on existing agricultural buildings generally fall within permitted development provided the installation does not project more than 200mm beyond the roof plane, the building is not listed, and the farm is not within a designated protected area.
Ground mounted systems on agricultural land fall within a different planning category and require a formal planning application for larger installations. The threshold is generally 50kWp for ground mounted systems before full planning is required, though the specific position depends on the Aberdeenshire Council planning policies in force at the time of application.
Faithful Spark assesses the planning position for every agricultural site at the survey stage and advises whether permitted development applies or whether an application is needed before installation can proceed.
Grid connection for larger farm systems
Farm solar systems above 16kW single phase or above approximately 50kW three phase require a formal grid connection assessment and a G99 application to Scottish and Southern Electricity Networks (SSEN), which is the distribution network operator for Aberdeenshire. The G99 process involves a technical assessment by SSEN to confirm the local grid can accommodate the additional export capacity.
G99 applications can take 8 to 16 weeks to process. For farm projects where the system is designed primarily for self consumption with minimal export, the G99 process is typically straightforward. For systems designed to export a significant proportion of their generation, SSEN may require network reinforcement works as a condition of connection. Faithful Spark handles all grid notification and G99 applications as part of every commercial agricultural project.
The financial return: an Aberdeenshire arable farm example
Consider an Aberdeenshire arable farm with 60,000 kWh per year of electricity consumption, spending approximately £14,400 per year at 24p per kWh. A 50kWp solar system generating 43,000 kWh per year (allowing for Scottish irradiance and system losses) with 70% self consumption would deliver:
- Self consumed solar: 30,000 kWh at 24p = £7,200 per year in bill savings.
- Exported surplus: 13,000 kWh at 14.5p SEG rate = £1,885 per year.
- Total annual financial return: approximately £9,085 per year.
Against an installed cost of £40,000 before capital allowances, the payback before tax relief is approximately 4.9 years. After capital allowances at 25% corporation tax (saving £10,000), the net cost is £30,000 and the payback is approximately 3.7 years. After that, the system generates free electricity for the remaining 20 or more years of its operating life.
Frequently asked questions
Does MCS certification apply to farm solar installations?
Yes. MCS certification is required for all solar PV installations up to 50kWp to access Smart Export Guarantee payments. For systems above 50kWp, different export arrangements apply. For larger commercial systems, we advise on the appropriate export route at the design stage.
Can I install solar on a steel or asbestos roof?
Steel sheet roofs are straightforward to work with using appropriate metal sheet mounting systems. Asbestos cement roofing (widely used on Aberdeenshire farm buildings built before 1990) requires careful assessment. Drilling through asbestos cement is subject to strict regulations and must be carried out by a licensed contractor. In most cases, asbestos roofs are better replaced before solar is installed, as the cost of removing panels for a future roof replacement outweighs the short term saving. Faithful Spark advises on this clearly at the survey stage.
How long does a farm solar installation take?
A 50kWp system on a single building typically takes 3 to 5 days to install. Larger systems across multiple buildings take longer. The G99 grid notification process (for systems above 50kW three phase) runs in parallel with installation preparation and does not delay the installation itself provided the application was submitted at the design stage.
Can I sell surplus electricity to the grid at a commercial rate?
For systems registered under MCS, export is paid at the SEG rate offered by your electricity supplier. Some specialist Power Purchase Agreement (PPA) arrangements are available for larger commercial systems that negotiate a fixed export rate with an energy trader. For systems above 100kWp, a PPA route may offer better value than the retail SEG. Faithful Spark can provide an introduction to PPA providers for larger agricultural projects.
Book a free agricultural solar survey in Aberdeenshire
Faithful Spark carries out free surveys for farm and agricultural solar projects across Aberdeenshire. We assess your buildings, electricity consumption, and the financial return specific to your enterprise. We provide a written quote covering all equipment, installation, and grid notification. See our guide to solar panel installation in Aberdeen and Aberdeenshire for more on our installation process and standards.
Book My Free Agricultural Solar Survey
Faithful Spark Electricians. NICEIC approved. Serving Aberdeen, Peterhead, Ellon, Fraserburgh and across Aberdeenshire.
