Farm solar cost by system size — full price ladder
| System | Gross cost | After AIA + grant | Annual kWh | Annual saving | Payback |
|---|---|---|---|---|---|
| 20 kWp small barn | £14,000–£18,000 | £8,400–£10,800 | 17,500 | £4,200 | 2.0–2.6 yr |
| 50 kWp medium barn | £32,000–£40,000 | £19,200–£24,000 | 43,000 | £10,500 | 1.8–2.3 yr |
| 100 kWp typical farm | £60,000–£75,000 | £36,000–£45,000 | 88,000 | £21,500 | 1.7–2.1 yr |
| 200 kWp large farm | £115,000–£140,000 | £69,000–£84,000 | 178,000 | £44,000 | 1.6–1.9 yr |
| 500 kWp estate scale | £270,000–£330,000 | £162,000–£198,000 | 450,000 | £112,000 | 1.5–1.8 yr |
Figures assume south-facing 30° pitch roof, 70% self-consumption, 30p/kWh tariff, grants up to 40% capital + 100% AIA on residual. Real economics vary by farm type — request a free desk feasibility for site-specific modelling.
Cost by farm type
Cost per kWp is broadly the same across farm types, but optimal system size and battery requirement varies materially:
- 🐄 Dairy farm (150-300 head) — typical 65-150 kWp, gross £45-105k / net £24-56k, payback 1.8-2.4 years. Battery often justified (60-100 kWh) for evening milking.
- 🌾 Arable farm (400-1,200 ac) — typical 50-200 kWp, gross £35-140k / net £19-75k, payback 2.0-2.6 years. Seasonal harvest peaks; battery often unnecessary.
- 🐔 Free-range poultry (16k bird unit) — typical 80-150 kWp, gross £55-105k / net £29-56k, payback 1.5-1.9 years (fastest UK farm solar payback class).
- 🐖 Pig unit (intensive) — typical 100-200 kWp, gross £70-140k / net £37-75k, payback 1.6-2.0 years. Continuous baseload favours battery 60-120 kWh.
- 🌱 Mixed 200-500 acres — typical 30-75 kWp, gross £21-53k / net £11-28k, payback 1.7-2.2 years.
- 🍓 Soft fruit + packhouse — typical 100-300 kWp, gross £70-200k / net £37-107k, payback 1.6-2.0 years. Tesco Scope-3 reporting often drives the project.
- 🐎 Equestrian / smallholding — typical 15-40 kWp, gross £12-32k / net £6-17k, payback 2.2-3.0 years.
- 🌿 Glasshouse / horticulture — typical 500 kWp-1 MW, gross £270k-£700k, payback 1.6-2.2 years.
What's included in farm solar cost
A reputable UK farm solar quote includes everything below — not just panels:
- ✓ MCS-certified Tier-1 panels (Trina, JA Solar, REC, Meyer Burger, SunPower, LONGi)
- ✓ String inverters (SolarEdge, SMA, Fronius, Huawei FusionSolar)
- ✓ DC isolators, AC switchgear, surge protection
- ✓ Mounting system appropriate to roof type (steel, composite, slate, ground)
- ✓ Bird mesh + weatherproof penetration sealing
- ✓ Monitoring system + mobile dashboard
- ✓ Half-hourly meter data analysis for system sizing
- ✓ Structural survey (roof or ground-mount geotech)
- ✓ DNO G99 grid connection application end-to-end
- ✓ grant application written as part of the quote
- ✓ Asbestos cement assessment; licensed removal coordinated if needed
- ✓ Scaffolding, install labour, commissioning
- ✓ MCS certificate, SEG registration, EPC update
- ✓ 25-year panel warranty, 10-year inverter cover, 5-year workmanship
- ✓ IWA insurance-backed warranty for 10 years
What's NOT typically included (check the small print)
- ❗ Asbestos cement roof removal — typically £20-£40/m² licensed removal + replacement sheet. Around 18% of UK farm barns still have ACM roofing.
- ❗ Three-phase supply upgrade — £3,000-£15,000 depending on DNO works. Smaller dairy farms still sometimes have single-phase supplies inadequate for 50kW+ systems.
- ❗ DNO grid reinforcement contributions — £2,000-£25,000 where local capacity is constrained.
- ❗ Planning application fees — £462 for prior notification, £1,200+ for full planning. Usually only applies outside permitted development.
- ❗ Structural reinforcement — £4,000-£18,000 where older steel-frame buildings need purlin or rafter upgrades.
- ❗ Battery storage — quoted separately. £8,500 for 15 kWh up to £90k+ for 250 kWh+ commercial-scale BESS.
Finance routes — three ways to pay
- 1. Capital purchase + 100% AIA — pay up front, claim 100% Annual Investment Allowance, retain all generation. Best lifetime cost-of-energy at ~2p/kWh effective. Fastest absolute payback.
- 2. Asset finance (5-10 year HP) — £0 deposit, fixed-rate, repayments structured below projected savings. Cash-positive from month one. Best for tenant farmers and cash-light operations.
- 3. Power Purchase Agreement (PPA) — third-party finances and installs; you pay 10-16p/kWh for the electricity it generates over 15-25 years. Best for ground-mount 200 kWp+ where no capex is wanted.
See our finance options page for the full side-by-side comparison and lifetime cost-of-energy analysis.
Are there grants?
Yes — five major routes for UK farm solar in 2026:
- 🟢 Improving Farm Productivity grant (England) — 25% of eligible capital, £100k cap; the FETF closed for good in April 2026
- 🟢 SFI Pollinator Package — £600-800/ha/year for agrivoltaic ground cover
- 🟢 Welsh Farm Business Grant Energy — 40%, £12k-£100k, quarterly windows
- 🟢 Scottish CARES — interest-free loans up to £150k, continuously open
- 🟢 NI DAERA Farm Energy Efficiency Scheme — 40%, annual spring window
All stack with 100% Annual Investment Allowance. A good installer quote includes the grant application written as standard. See our 2026 grant calendar for application timing.
Frequently asked questions
How much does it cost to install solar panels on my farm?
£600-£900 per kWp gross, £360-£540 per kWp net after AIA + grant. A 100 kWp system: £60-75k gross / £36-45k net. Annual saving £21,500. Payback 1.7-2.1 years.
What is the cheapest farm solar system size?
20 kWp on a small barn or parlour roof: £14-18k gross / £8.4-10.8k net. Generates 17,500 kWh/year, saves £4,200/year. Payback 2.0-2.6 years. Sub-10 kWp not usually viable for farms.
How much does a 500 kW farm solar system cost?
£270-£330k gross / £162-£198k net after AIA + grant. Generates 450,000 kWh/year, saves £112,000/year. Simple payback 1.5-1.8 years. Often paired with PPA finance.
How long until solar panels pay for themselves on a farm?
2–4 years after the 100% AIA + capital grant. Dairy and poultry (high self-consumption) often under 2 years. Arable (seasonal demand) typically 2-3 years.
Are there grants for farm solar?
Yes — Improving Farm Productivity (England, 25%), Welsh FBG-E, Scottish CARES, NI DAERA — grants of 25–40% depending on nation. All stack with 100% Annual Investment Allowance.
Does battery storage make economic sense?
Yes for high-baseload farms (dairy, poultry, pig). £8-40k for 15-60 kWh, lifts self-consumption from 50% to 80-90%, adds £1.8-9.2k/year extra saving.
What is the cheapest way to finance farm solar?
Capital purchase + 100% AIA delivers lowest lifetime cost-of-energy (~2p/kWh effective). Asset finance is cash-positive from month one for tenant farmers.
Will solar lower my bills immediately?
Yes — from commissioning. Typical 100 kWp system reduces farm grid spend 60-70% in year one. With battery: 80-90% reduction.