UK farms finance solar in four main ways. The right choice depends less on your farm's size than on your cash position, your capital allowance headroom, and your appetite for asset ownership.
Option 1 — Capital purchase + Annual Investment Allowance
You pay the full cost up front. For a 10–50 kW system the DESNZ 2025/26 median is about £1,262 per kW (Great Britain; including VAT where charged; excluding batteries); there is no official series above 50 kW, so larger arrays are priced from itemised quotes. No farm solar grant is open in England, Wales, Scotland or Northern Ireland as of September 2026, so there is no grant to deduct. Solar panels are special-rate plant, and most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance. You own the system outright and keep all the electricity it generates and any Smart Export Guarantee export income (Great Britain only).
Best for: profitable limited companies with capital allowance room, partnerships without a company member and sole traders with strong year-end profits, farms wanting absolute lowest cost of energy.
Payback depends on how much of the output the farm uses itself: simple payback is the cost divided by the annual saving.
Option 2 — Asset finance (5–10 year term)
Fixed-rate finance against the system value, repaid monthly over the term. Repayments can be structured to sit below your projected energy savings, so check that projection against your own meter data and tariff.
With a loan you own the system from day one; under hire purchase it becomes yours once the finance is repaid, and you claim the capital allowances on it. Whether you are cash-flow positive from the start depends on the repayments against the saving the farm actually makes, and over the term you pay more than the cash price because of interest.
Best for: tenant farmers (with landlord consent), farms preserving capital for stock or land, projects where the saving covers the finance with margin to spare.
Option 3 — Power Purchase Agreement (PPA)
A third-party investor (often institutional capital) finances, installs and maintains the system on your roof or land. You pay only for the electricity it generates, at a fixed unit rate usually priced below your current grid tariff.
No capital outlay, no finance agreement and no maintenance responsibility: the investor owns the kit. Ask your accountant whether the contract contains a lease, which for accounting periods from 1 January 2026 would usually sit on the balance sheet under FRS 102. Contracts can include options to buy the system mid-term or take ownership at the end.
Best for: farms with no capital to invest, tenant farmers, farms preserving borrowing capacity for other investments, large-scale (200kW+) ground-mount systems.
Side-by-side comparison
| Capital | Asset finance | PPA | |
|---|---|---|---|
| Up-front cost | The full price, from itemised quotes | Spread over the term in repayments | None |
| Who owns the kit | You, from day one | You: at once with a loan, or once the finance is repaid under hire purchase; the lessor under a lease | The investor, for the term |
| Who claims capital allowances | You (Annual Investment Allowance, or the 50% first-year allowance for companies) | You under hire purchase; usually the lessor under a lease | The investor |
| What you pay for | The system, once | Repayments including interest, or lease rentals | The electricity you use, per kWh |
| End of the term | Nothing further: you already own it | Yours once repaid under hire purchase; a lease ends as its agreement sets out | Usually transfers to you or can be bought out; check the clause |
Tax treatment of each finance route
Different finance routes are taxed differently — this materially affects the year-1 cash position on your books:
- Capital purchase: solar panels are special-rate plant (CAA 2001, Part 2). Most farm businesses can deduct the whole cost in year one through the £1 million Annual Investment Allowance, though a partnership with a company as a member cannot claim it. Companies may claim the 50% first-year allowance on special-rate assets instead, and anything not relieved goes into the special rate pool on a reducing balance. Full expensing and the 40% first-year allowance do not apply to solar.
- Asset finance (HP): AIA available on the full capital value at start of agreement. Interest portion of repayments allowable as trading expense.
- Asset finance (lease): Rentals are normally deductible for tax over the term (outside the long funding lease rules), and the lessee cannot claim AIA. For accounting periods from 1 January 2026, most leases sit on the lessee's balance sheet under FRS 102 (short-term and low-value leases excepted; micro-entities on FRS 105 are unaffected).
- PPA: Payments for the electricity are a normal trading expense, and the farm claims no capital allowances because the investor owns the kit.
- Private Wire PPA: Same treatment as PPA. Site licence income (where you receive a roof rental) is taxable income.
Lifetime cost-of-energy comparison
To compare the routes over the life of the system, add up everything each route costs you over the same period (the purchase price, or repayments including interest, or PPA payments) and divide by the kWh the farm actually uses from the array. That gives an effective price per kWh to set against the unit rate on your own electricity bill. Use itemised quotes and your own half-hourly meter data rather than generic figures, remember that panel output typically falls by about 0.5% a year (NREL), and on the routes where you own the kit, allow for replacing the inverter during the system's life.
Which finance route is right for which farm?
- ✓ Profitable limited company with strong year-end position → Capital purchase. The Annual Investment Allowance can relieve the whole cost in year one, and owning the kit usually gives the lowest lifetime cost of energy.
- ✓ Tenant farmer or capital-light operator → Asset finance. Repayments are spread over the term; under hire purchase you claim the allowances and own the system once the finance is repaid.
- ✓ Sub-100kW system on a smaller mixed farm → Capital or asset finance. PPA isn't viable at this scale (developer minimum thresholds).
- ✓ 200kW+ ground-mount on land you'd otherwise lease to an external developer → PPA is the natural comparison.
- ✓ Estate with neighbouring commercial energy customer → Private Wire PPA. Capture higher unit prices than wholesale export.