A UK farm solar installation in 2026 typically costs £600–£900 per kWp installed, with the unit price falling as system size increases. Smaller 20kW barn-roof systems sit at the upper end of that range; larger 200kW+ multi-building installs come in toward the lower end thanks to economies of scale on labour, scaffold, and grid connection.
After England's Improving Farm Productivity grant covering 25% of eligible capital (devolved schemes run 25–40%; the FETF closed in April 2026), and 100% first-year Annual Investment Allowance writing the residual down against profits, the net out-of-pocket cost typically falls to £450–£675 per kWp. With current electricity tariffs averaging 25–32p/kWh for rural three-phase commercial supplies, the typical UK farm now achieves simple payback in 2–4 years on solar PV alone.
Farm solar costs by system size
| System | Gross cost | After AIA + grant | Annual kWh | Annual saving | Payback |
|---|---|---|---|---|---|
| 20kW | £14,000–£18,000 | £8,400–£10,800 | 17,500 | £4,200 | 2.0–2.6 yr |
| 50kW | £32,000–£40,000 | £19,200–£24,000 | 43,000 | £10,500 | 1.8–2.3 yr |
| 100kW | £60,000–£75,000 | £36,000–£45,000 | 88,000 | £21,500 | 1.7–2.1 yr |
| 200kW | £115,000–£140,000 | £69,000–£84,000 | 178,000 | £44,000 | 1.6–1.9 yr |
| 500kW | £270,000–£330,000 | £162,000–£198,000 | 450,000 | £112,000 | 1.5–1.8 yr |
Figures assume south-facing 30° roof, no major reinforcement required, typical UK irradiance (950–1,100 kWh/kWp), 70% self-consumption, 30p/kWh grid tariff, capital grant at 40% capital. Real economics vary by location and farm type — request a free desk feasibility for specifics.
What's included in every quote
- ✓ Half-hourly meter data analysis (export limitation modelling, self-consumption forecast)
- ✓ Structural roof survey or ground-mount geotech
- ✓ MCS-certified panels (Tier 1), inverters and isolators
- ✓ Complete installation, scaffold, commissioning
- ✓ G99 grid connection application managed end-to-end
- ✓ IFP / SFI / Welsh FBG / Scottish CARES grant paperwork
- ✓ MCS certificate, EPC update, SEG registration
- ✓ 25-year panel performance warranty, 10-year inverter cover, 5-year workmanship
- ✓ Monitoring dashboard with mobile access
Three ways to pay
Capital purchase
Pay up front, claim 100% AIA in year one, retain all generation. Best for farms with strong cash position or capital allowance headroom. Fastest absolute payback.
Asset finance
£0 deposit, 5–10 year fixed-rate finance against the system. Repayments structured to be lower than your projected energy savings — cash-flow positive from month one.
Power Purchase Agreement (PPA)
Zero capital, zero risk. We finance, install and maintain the system; you pay a discounted unit rate for the electricity it generates over 15–25 years. Off-balance-sheet.
Adding battery storage — what it costs on top
Battery storage materially improves self-consumption on most farms — particularly dairy and poultry where peak loads sit outside the midday solar window. Typical pricing for a LiFePO4 battery alongside solar:
| Battery size | Cost | After AIA | Extra annual saving |
|---|---|---|---|
| 15 kWh | £8,500–£11,000 | £6,400–£8,250 | £1,800–£2,400 |
| 30 kWh | £15,000–£19,000 | £11,250–£14,250 | £3,600–£4,800 |
| 60 kWh | £25,000–£32,000 | £18,750–£24,000 | £6,800–£9,200 |
| 120 kWh | £45,000–£58,000 | £33,750–£43,500 | £13,500–£18,000 |
| 250 kWh+ | £85,000+ | £63,750+ | £28,000+ |
Additional costs that aren't always in the headline
Most farm solar quotes include scaffold, install, panels, inverters, isolators and commissioning. Items that occasionally sit outside the headline figure:
- Asbestos cement roof removal — £20–£40 per m² licensed removal + replacement sheet. Around 18% of UK farm barn roofs are still asbestos cement.
- Three-phase supply upgrade — £3,000–£15,000 depending on DNO works required. Smaller dairy farms often still have single-phase supplies inadequate for 50kW+ systems.
- DNO grid reinforcement contributions — £2,000–£25,000 where local capacity is constrained. NGED and Northern Powergrid quote these case-by-case.
- Planning application fees — £462 for prior notification, £1,200+ for full planning. Usually applies only outside permitted development.
- Structural reinforcement — £4,000–£18,000 where older steel-frame buildings need purlin or rafter upgrades to take the panel weight.
- Ground conditions for ground-mount — £8,000–£25,000 for screw piling on rocky or boggy terrain (Levels, Mendips, upland sites).
Price by farm type — typical project mix
| Farm type | Typical sys size | Gross cost | Net (post-AIA + grant) | Payback |
|---|---|---|---|---|
| Dairy farm 150-300 head | 65–150 kWp | £45k–£105k | £24k–£56k | 1.8–2.4 yr |
| Arable farm 400-1,200 ac | 50–200 kWp | £35k–£140k | £19k–£75k | 2.0–2.6 yr |
| Free-range poultry 16k bird | 80–150 kWp | £55k–£105k | £29k–£56k | 1.5–1.9 yr |
| Mixed farm 200-500 ac | 30–75 kWp | £21k–£53k | £11k–£28k | 1.7–2.2 yr |
| Soft fruit + packhouse | 100–300 kWp | £70k–£200k | £37k–£107k | 1.6–2.0 yr |
| Equestrian / smallholding | 15–40 kWp | £12k–£32k | £6k–£17k | 2.2–3.0 yr |
How we quote — the numbers that go into your price
A serious farm solar proposal isn't a "kW × £/kW" estimate. We build every quote from five real-world inputs:
- 1. Half-hourly meter data (12 months) — this tells us your actual demand pattern, your peak/off-peak split, your seasonal swing, and what % of generated solar you'll genuinely self-consume vs. export. Without this, sizing is a guess.
- 2. Roof and ground survey — we photograph and measure every roof surface, check structural integrity (especially for asbestos and 1970s-1990s steel buildings), and identify shading from neighbouring trees, silos and adjacent buildings. Shading kills 5–15% of expected yield if not designed around.
- 3. Supply intake and DNO check — we read your incoming supply meter, check three-phase vs single, identify the local DNO (UKPN, NGED, SSEN, SPEN, Northern Powergrid, NIE) and submit a budget enquiry for export capacity.
- 4. IFP / SFI / FBG / CARES / DAERA eligibility — score the application against the current scheme criteria before committing to the timeline.
- 5. Asset ownership and tenancy structure — we confirm whether you own the holding or operate under FBT/AHA, and structure the proposal accordingly. Tenant solar typically involves a 3-way deal with the landlord that we draft alongside.