Solar Panels for Farms in Wiltshire

An independent guide to solar on farms in Wiltshire and the wider Wiltshire area, including Gloucestershire, Oxfordshire, Berkshire: what it costs, the planning rules, the grid and the funding position, from official sources.

Agricultural solar panels in Wiltshire

Agricultural solar panels in Wiltshire pay back faster than almost anywhere else in southern England, and the reason is the county’s farming structure. Wiltshire is a large, open county of roughly 720,000 residents spread across 3,485 km² — the bulk of it big chalk arable on the downs that frame Salisbury Plain, with intensive dairy concentrated in the heavier clay vales of the west around Trowbridge, Melksham and Bradford-on-Avon, and substantial sheep flocks running the higher unimproved downland. The county supports several thousand active holdings working close to 270,000 hectares of agricultural land. Grain stores, drying floors, dairy parlours with continuous bulk-tank cooling, and livestock sheds with ventilation and lighting all carry the high, steady daytime electricity loads that make a roof-mounted array a near-perfect fit — most of the generation is consumed on site rather than exported, which is where the economics turn.

The grid context helps too. Most of Wiltshire is served by Scottish and Southern Electricity Networks (SSEN) as the distribution network operator, with the far west of the county around Bradford-on-Avon and Westbury falling under National Grid Electricity Distribution (NGED, formerly WPD). The county sits in one of the sunnier bands of inland England, receiving around 1,030–1,080 kWh/m² of horizontal irradiance a year, so a well-oriented south-facing system here reliably yields 1,000+ kWh per kWp installed annually. That figure matters more than it sounds: a 100 kWp array on a Wiltshire grain store will typically generate over 100,000 kWh a year, and on a high-baseload arable or dairy holding the great majority of that is consumed on the farm at a marginal grid price most businesses now pay 28–35p a unit for. MCS-certified installers deliver solar PV across arable, dairy, sheep and mixed enterprises. SolarPanelsForFarms.uk is an independent guide, not an installer: enquiries from Salisbury, Swindon, Chippenham, Trowbridge, Devizes, Marlborough and the surrounding rural areas go to a matched MCS-certified installer covering the area, which returns a desk feasibility within 3 working days.

Field-edge and ground-mount options change the arithmetic completely — what an acre of ground-mount actually returns.

Farm solar across Wiltshire by district

Grants and tax relief for Wiltshire farms

Wiltshire farms are in England, so the funding picture is the English one — there are no devolved Welsh, Scottish or Northern Irish schemes to draw on here — and no grant for solar panels on farms is open. The position on the three main levers:

• Improving Farm Productivity grant (England) — closed. Round 2 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, and closed to full applications on 31 July 2025; 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.
• 100% Annual Investment Allowance (AIA) — full first-year tax relief on qualifying plant up to £1m, which means the entire net cost of a typical Wiltshire farm array can be written off against profits in year one.
• Smart Export Guarantee (SEG) — a per-kWh payment from your electricity supplier, which sets its own rate, for any surplus exported to the grid. For chalk-arable farms with low summer self-consumption, SEG meaningfully improves the return on a larger system.

The current status of each scheme is on our farm solar grants page. For a cost benchmark, DESNZ 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 and excluding batteries — see the agricultural solar panel cost guide for the full per-kWp maths.

Planning and grid in Wiltshire

Wiltshire is a heavily designated county and that shapes where solar can go. The North Wessex Downs AONB sweeps across the north and east around Marlborough and the Pewsey Vale, the Cranborne Chase AONB covers the south near the Dorset border, and Salisbury Plain brings its own Ministry of Defence training-area and SSSI sensitivities. The practical rule is simple, though: roof-mounted PV on existing agricultural buildings almost always qualifies as permitted development under Class J (Part 14 of the GPDO 2015), even inside an AONB — no capacity limit, panels no more than 0.2 m proud of a pitched roof and at least 1 m from the roof edge, and the council’s prior approval on design and glare above 50 kW — and it is field-scale ground-mount that triggers full planning, with a landscape and visual impact assessment expected anywhere in or near the designated areas. Listed farm buildings (common, with village conservation areas, around Marlborough, Devizes and the Avon vale) are excluded from Class J and need full applications and conservation-officer engagement. Wiltshire Council runs a generally pragmatic agricultural-renewables service with typical determination inside 8 weeks.

On the grid side, your G99 application (or G98 for smaller systems) goes to Scottish and Southern Electricity Networks (SSEN) across most of the county, or to NGED in the far west around Bradford-on-Avon and Westbury. SSEN’s typical timeline runs 8–12 weeks for sub-200 kW connections and longer for larger arrays, and some rural three-phase circuits on the downs and out toward the Plain are capacity-constrained. Knowing which DNO a holding sits under from the outset avoids the classic delay of applying to the wrong operator on a farm near the county boundary. Where export headroom is tight, an export-limited system paired with battery storage is an option — most Wiltshire dairy and arable farms self-consume enough that an export limit barely touches payback.

Typical Wiltshire farm solar projects

Representative ranges for the county’s main enterprise types — illustrative project profiles, not specific named farms:

• Chalk arable with grain storage (Salisbury Plain / Marlborough Downs): 80–250 kWp roof-mount across grain stores and machinery sheds. Strongest returns come from August–October generation aligning with grain-drying load, with much of the rest self-consumed by store ventilation.
• West Wiltshire dairy (Trowbridge / Bradford-on-Avon vale): 60–200 kWp roof-mount plus a 30–80 kWh battery to shift midday surplus into early-morning and evening milking and continuous bulk-tank cooling. The battery earns its keep covering overnight cooling loads.
• Mixed and livestock holdings (Devizes / Vale of Pewsey): 40–120 kWp on parlour, barn and youngstock-shed roofs, sized to baseload lighting and ventilation. Steady year-round demand gives very high self-consumption.
• Pig and poultry units (north Wiltshire / Swindon fringe): 50–250 kWp matched to the near-constant ventilation, heating and lighting loads these buildings carry. Flat 24-hour demand makes self-consumption exceptional and supports the larger end of the system range.

Every quote should start from your actual half-hourly meter data, so the system is sized to what you really use rather than to roof area alone. A matched MCS-certified installer covering Wiltshire returns a desk feasibility within 3 working days.

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.