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 (90%+ approval rate)
- ✓ 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:
- 🟢 FETF (England) — up to 40% capital, £100k cap, annual Feb-Mar window
- 🟢 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. We write every grant application as part of every quote — 90%+ approval rate on submissions we prepare. 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 — FETF (England), Welsh FBG-E, Scottish CARES, NI DAERA. All stack with 100% Annual Investment Allowance. We write every application.
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.