Solar Panels for Farms: Agricultural Solar UK
Are solar panels worth it for farms?
Farms are ideal for solar panels: large roof areas (barns, sheds, milking parlours), high daytime electricity consumption, and favourable tax treatment. Agricultural solar costs £700–£1,000 per kWp installed — cheaper than residential due to scale. A 50kW system on a farm barn costs £35,000–£50,000, saves £8,000–£12,000 per year, and pays back in 4–7 years with full expensing tax relief. Ground-mounted solar arrays on unused land can generate additional income.
Why Farms Are Ideal for Solar
- Large, unobstructed roof areas — barns, grain stores, machinery sheds, milking parlours, and pack houses offer hundreds of square metres of roof space
- High daytime electricity consumption — irrigation, refrigeration, milking equipment, grain drying, and lighting all run during peak solar hours
- Unshaded locations — rural settings with no neighbouring buildings casting shadows
- Structural capacity — agricultural steel-frame buildings typically have strong roof structures designed for heavy loads
- Tax benefits — 100% first-year capital allowances (full expensing) + VAT recovery for VAT-registered farm businesses
- Diversification income — ground-mounted solar on unproductive land generates income alongside farming
- Grid independence — rural grid connections can be unreliable; solar + battery provides backup
- Environmental stewardship — demonstrates sustainability commitment for farm assurance schemes and retailers
Farm Solar Costs and Payback
Agricultural solar pricing (2026):
| System Size | Typical Building | Cost (ex VAT) | Annual Saving | Payback | |-----------|-----------------|--------------|--------------|----------| | 20kW | Small barn | £16,000–£22,000 | £3,500–£5,000 | 4–6 years | | 50kW | Large barn/shed | £35,000–£50,000 | £8,000–£12,000 | 4–6 years | | 100kW | Grain store/pack house | £65,000–£90,000 | £16,000–£24,000 | 4–6 years | | 250kW | Multiple buildings | £150,000–£225,000 | £40,000–£60,000 | 4–5 years |
*Costs are ex-VAT (recoverable for VAT-registered farm businesses)* *Payback includes 100% first-year capital allowance at 25% CT/income tax*
Effective cost after tax benefits: A VAT-registered farming business paying 25% income tax: - Gross cost (100kW): £90,000 + VAT (£108,000) - VAT recovery: –£18,000 - First-year tax relief (25% × £90,000): –£22,500 - Effective cost: £67,500 (37.5% less than headline)
Source: Agricultural solar installer pricing; HMRC full expensing guidance.
Ground-Mounted Solar on Farm Land
Farms have the unique option of ground-mounted solar on unused or low-productivity land:
Small-scale (under 50kW): - Permitted development — no planning needed if under 50kW on agricultural land - Cost: £700–£1,000 per kWp - Use: power the farm directly
Medium-scale (50kW–5MW): - Requires planning permission - Can qualify for Smart Export Guarantee or PPA (Power Purchase Agreement) income - Often combined with sheep grazing ('agrivoltaics') — animals graze under and around panels
Large-scale solar farms (5MW+): - Significant planning and grid connection requirements - Rental income: £800–£1,200 per acre per year - 25-year lease with solar developer - Farmer retains land ownership
Agrivoltaics (dual use): - Ground-mounted panels raised 2–3m allow sheep grazing underneath - Panels shade livestock in summer (welfare benefit) - No loss of grazing land — dual income from solar + farming - Growing practice in the UK with policy support
Source: NFU solar guidance; DEFRA agricultural land use policy.
Farm Solar: Planning and Permits
Roof-mounted on existing farm buildings: - Under 50kW on agricultural buildings: usually permitted development - No separate planning application needed - Must not extend above the existing roof ridge - Must not be in a heritage area without checking first
Ground-mounted on agricultural land: - Under 50kW with panels under 4m: usually permitted development on agricultural land - 50kW–5MW: requires full planning application - Environmental impact assessment may be required for larger schemes - Agricultural Land Classification matters — councils prefer solar on Grade 3b and lower land, not Grade 1–3a best and most versatile agricultural land
Grid connection: - Under 3.68kW: G98 (simple notification) - 3.68kW–50kW: G99 (application, usually approved within 2 weeks) - 50kW+: formal grid connection application to DNO — may require grid upgrade (costs vary significantly by location)
Source: Planning Portal agricultural permitted development; ENA connection guidelines.
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