PPA for Farms: Agricultural Solar Power Purchase Agreements

Solar PPA for farms explained

A Power Purchase Agreement (PPA) is a long-term contract where an investor or developer installs a solar system on your farm at no cost to you, and in return sells you the electricity it generates at a fixed, discounted unit rate. You pay for what you use; they own the asset. A farm solar PPA is the main route to zero-capex solar for an agricultural business that does not want to (or cannot) fund the system itself.

How it works

1. 1. Roof or land lease. You grant a 15–25 year licence for the investor to install panels on a specified roof or field. No mortgage charge in most modern PPAs.
2. 2. Investor pays for everything. Panels, inverters, structural reinforcement, grid connection, planning, ongoing maintenance — all funded by the PPA provider.
3. 3. You pay a unit rate per kWh consumed. Usually priced below grid import. Locked in for the contract term with limited inflation linkage.
4. 4. Exported electricity sold separately. Excess generation is sold by the investor under the Smart Export Guarantee (Great Britain only) or a wholesale PPA. You don't profit from export, but you don't have to manage it either.
5. 5. Buyout or transfer at term end. Most PPAs include a buyout option at year 7–10 (depreciated asset value) and an option to take free ownership at term end.

When a PPA is the right call

• ✓ You have no capital to invest in solar but want immediate energy savings
• ✓ You're a tenant farmer (with landlord consent — most modern FBT terms permit this)
• ✓ You're preserving borrowing capacity for stock, land or new buildings
• ✓ You want a hassle-free arrangement — investor handles maintenance, monitoring and warranty admin
• ✓ Your system is large (200kW+) and ground-mount, so PPA economics work for the investor

When a PPA is the wrong call

• ✗ You have capital and want maximum lifetime return — outright purchase usually beats PPA on total economics
• ✗ You're profitable and could use the £1m Annual Investment Allowance to deduct the whole cost in year one
• ✗ Your system is small (sub-50kW) — investors rarely PPA below 100kW on agricultural roofs
• ✗ You're considering selling or restructuring the farm within 5–10 years — PPA terms can complicate due diligence

PPA vs buying outright vs lease finance — the three routes compared

A PPA is one of three ways to put solar on a farm. The right choice depends on whether you have capital, taxable profit, and the appetite to own the asset. This is the decision every farm makes — here is the side-by-side:

If you can fund the project, outright purchase usually wins on total economics — see the agricultural solar panel cost guide and finance options. A PPA wins when you have no capital and the system is large. Decision unclear? Ask the matched MCS-certified installer to set out all three side by side in your free desk feasibility.

Farm solar PPA example — how to work the numbers for a 200kW dairy

PPA unit rates are quoted site by site, so a worked example has to use your own figures. For a 200kW system on a dairy farm:

• Take the array's annual generation from the installer's desk feasibility model.
• Use your half-hourly meter data to estimate how much of that output the farm would use itself: a dairy's milking, cooling and ventilation loads use more of it than a farm with little daytime demand.
• PPA saving each year = kWh used on the farm × (your grid unit rate − the PPA unit rate), with zero capital outlay and no maintenance liability. The investor sells the exported surplus.
• Buying instead: there is no official price series above 50 kW, so price the 200kW array from itemised quotes; most farm businesses can then deduct the whole cost in year one through the £1 million Annual Investment Allowance.

Buying keeps the whole saving, plus any Smart Export Guarantee income on the exported surplus (Great Britain only), and its simple payback (cost ÷ annual saving) depends on how much of the output the farm uses itself. After payback the savings continue for the rest of the array's life, with panel output typically falling by about 0.5% a year (NREL). The PPA gives you a saving with no outlay; buying usually gives a bigger lifetime return if you have the capital.

Typical PPA terms in 2026

PPA lease structure — what you're actually signing

A standard UK agricultural PPA involves three concurrent legal documents:

1. 1. Roof or land licence — gives the investor exclusive rights to install, operate and maintain the array on the specified roofs or land plot for the contract term. Annual licence fee paid to landowner (agreed per acre for ground-mount; nominal for rooftop). Restrictive covenants for the duration — you can't sell/let the building/land without investor consent.
2. 2. Power Purchase Agreement — the unit-price contract. You agree to buy the electricity generated at the agreed p/kWh rate, with annual RPI indexation (usually capped). You commit to maintaining a minimum supply baseline (a set share of historical consumption). Force majeure and termination clauses spelled out.
3. 3. Operations and Maintenance Agreement — confirms the investor's obligation to maintain the array to manufacturer specification, including cleaning, inverter replacement at year 12-15, and end-of-term decommissioning. Performance guarantees are set against P50 projected yield.

How tenant farmers approach a PPA

Many UK farms are tenanted, and tenant farmers face a specific PPA challenge — they don't own the roof or land, so they can't legally grant a licence to an investor. The solution is the tripartite PPA:

• Landlord grants the roof/land licence to the investor and receives an annual rental income. Most modern FBTs since 2018 explicitly permit this with written consent.
• Investor finances, installs, and maintains the system as before.
• Tenant farmer buys the electricity from the investor at the discounted unit rate — getting the operational benefit without holding the asset rights.

The economics work because the landlord receives rental income they wouldn't otherwise; the tenant receives discounted electricity they wouldn't otherwise; the investor gets the asset and capital appreciation. Tripartite PPAs are now common across tenanted estates precisely because every party gains — the landlord earns rent, the tenant gets cheaper power, and the investor owns the asset.

PPA risk allocation — read the small print

• Performance risk — typically investor's. Most PPAs include a P50 performance guarantee. If the system underperforms, the investor compensates you for the shortfall.
• Force majeure — typically investor's (extreme weather damage covered by their insurance).
• Tariff escalation risk — typically tenant's. RPI-linked unit prices can outpace grid retail in deflationary periods.
• Consumption baseline risk — tenant's. If you go below the agreed minimum, take-or-pay clauses can apply.
• Asset transfer at term end — typically free transfer to landowner, but some PPAs include buyout-at-fair-value or removal options. Read these carefully.

Two kinds of farm PPA — don't confuse them

The phrase "farm solar PPA" covers two very different arrangements. Be clear which one you mean before you talk to anyone:

1. 1. On-site supply PPA (the farm is the electricity user). Panels go on your roof or yard, an investor owns them, and you buy the power they generate at a discounted unit rate to cut your bills. This is the core of everything on this page — it's about saving on consumption.
2. 2. Land-lease / export PPA (you rent out a field). Here you lease land to a developer for a ground-mount solar farm and earn rent, usually index-linked over a long lease — or sell exported power. You are not the electricity user; you are the landlord. See our 1-acre solar farm guide and solar farm profit & income per acre for the full land-lease and per-acre income figures.

If your goal is cheaper electricity for the farm, you want route 1. If your goal is income from spare land, you want route 2.

PPA vs the grant route

A common question is whether you can take a capital grant and a PPA at the same time. Generally you cannot on the same equipment: a PPA means the investor owns and pays for the kit, while a capital grant funds your own purchase. Today the question does not arise: no farm solar grant is open in England, Wales, Scotland or Northern Ireland as of September 2026, and England's Improving Farm Productivity grant has closed with no further round announced. So the comparison is buying with the Annual Investment Allowance versus a PPA: if you can fund the project and have taxable profit, buying usually beats a PPA on lifetime return; if you can't, a PPA is the zero-capital alternative. Either way, ask the matched installer to set out both in your free desk feasibility so the choice is evidenced, not assumed.