Bar shows today’s value as a share of the total rent. Figures before tax. Rent is assumed to be paid yearly in advance and to rise once a year. Take legal, land agent and tax advice before signing an option or lease.
Formula and breakdown
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This solar farm income calculator estimates the rent a UK landowner would receive for leasing land to a solar farm developer, year by year and over the whole lease, from the acreage, the rent offered, the indexation and the lease term. It also shows what that rent stream is worth today and roughly how many megawatts the site could hold, so farmers and estate owners can test an offer before talking to a land agent.
Quick answer: The solar farm income calculator multiplies the leased acres by the rent per acre, then raises it each year by the lease's indexation. UK law firm guides quote about £850 to £1,100 per acre a year, so as an example 50 acres at £1,000 rising 2% a year pays £50,000 in year one and about £3.0 million over 40 years.
What Is a Solar Farm Income Calculator?
A solar farm income calculator is a tool that projects the rent paid to a landowner who leases fields to a ground-mounted solar developer. In plain words: first-year rent equals leased area times rent per acre; each later year's rent equals the previous year's times one plus the indexation rate; total income is the sum over the lease term; and today's value discounts each future payment by your chosen rate.
The landowner does not build or run the solar farm. A developer takes an option over the land, seeks a grid connection and planning consent, then signs a long lease and pays rent, while the landowner usually keeps sheep grazing between the rows. This page covers that lease model; if you plan to own panels yourself, the solar ROI calculator is the better fit.
How Do You Use the Solar Farm Income Calculator?
- Choose acres or hectares, then enter the area the developer will lease.
- Enter the rent per acre or per hectare from your offer or heads of terms.
- Enter the yearly indexation and the lease term written in the offer.
- Set a discount rate to see what the whole rent stream is worth in today's money.
- Optionally enter what the land earns now, to see the gain over farming it.
- Adjust the land per MW figure to match the developer's layout, then read the results and breakdown.
How Much Do Solar Farms Pay per Acre in the UK?
Published UK guides put solar farm rent at roughly £750 to £1,200 per acre a year, with most figures near £1,000. None of these numbers comes from an official statistic, so the solar farm income calculator treats rent as an example value for you to replace with a real offer. The table lists what each source says and who published it.
| Published by | Rent per acre a year | Same per hectare | Lease term quoted | Date |
|---|---|---|---|---|
| Law firm guide (Stephens Scown), subsidy-free solar | £850 to £1,100 | about £2,100 to £2,720 | 30 to 50 years | Reviewed Sept 2023 |
| Law firm guide (Myerson), large solar sites | about £1,000 | about £2,470 | 25 to 40 years | Undated, about 2023 |
| Trade article by an energy developer (Farming Monthly) | £750 to £1,200 | about £1,850 to £2,970 | about 40 years | May 2022 |
| Solar developer landowner brochure (Lightsource bp) | Not stated, "competitive" | Not stated | 30+ years, CPI linked | March 2023 |
Rent depends on the grid connection, field shape, land grade, competition between developers and site size, and two of the guides also describe a turnover top-up of about 4 to 6% of the developer's revenue when that beats the acreage rent. Check any offer with a land agent, since the figures above are several years old and are not adjusted for inflation since.
How Much Land Does a Solar Farm Need per MW?
A ground-mounted solar farm in northern Europe needs more than 2 hectares, about 4.9 acres, per megawatt with fixed panels, according to the Wikipedia article on photovoltaic power stations, and trackers need 10 to 20% more. UK examples match: a law firm guide gives about 25 acres per 5 MW, and developer case studies show 5.4 MW on about 30 acres and 5 MW on 42 acres.
The solar farm income calculator uses 5 acres per MW as an example to estimate the size of farm your land could hold and the rent per MW, a figure some developers use internally. Panels and equipment cover only part of the leased area; one developer says about 40%, with the rest in gaps between rows, margins and wildlife areas.
How Does Indexation Change Total Solar Farm Rent?
Indexation has a large effect over a long lease: at 2% a year, rent doubles in about 35 years, and 40 years of £50,000 starting rent totals about £3.0 million instead of £2.0 million flat. The table shows 50 acres at an example £1,000 per acre, with today's value at a 3.5% example discount rate.
| Lease term | Indexation | Final-year rent | Total rent | Today's value at 3.5% |
|---|---|---|---|---|
| 25 years | 0% | £50,000 | £1,250,000 | £852,918 |
| 25 years | 2% | £80,422 | £1,601,515 | £1,054,950 |
| 25 years | 3% | £101,640 | £1,822,963 | £1,180,150 |
| 40 years | 0% | £50,000 | £2,000,000 | £1,105,125 |
| 40 years | 2% | £108,237 | £3,020,099 | £1,525,969 |
| 40 years | 3% | £158,351 | £3,770,063 | £1,822,625 |
Today's value matters because £1 received in year 40 is worth far less than £1 now. The discount rate is your choice: use what you could earn elsewhere or what you pay to borrow. Leases often link rent to CPI or RPI, sometimes with a cap and collar, so read the indexation clause closely.
What Else Should Landowners Check Before Signing?
Rent is only part of the deal, and most of the risk sits in the option period, which law firm guides describe as typically 3 to 5 years while the developer seeks planning and a grid connection. Points to check include:
- Option fees and whether rent starts at construction or only at connection; one developer pays rent from the start of construction.
- The indexation basis (CPI or RPI), review dates and any cap.
- Grazing rights, access routes and which land stays in farm use.
- Decommissioning: who removes the equipment, and whether a bond is funded during the lease.
- Tax: rental income and the effect on agricultural reliefs need advice from an accountant.
Large schemes in England are consented under the National Policy Statement for renewable energy infrastructure (EN-3), revised version in force from 6 January 2026, while smaller ones go through the local planning authority. For comparison with putting panels on your own buildings, try the solar payback calculator or the solar panel savings calculator.
Worked Example: Leasing 50 Acres to a Solar Developer
Example: a farmer in southern England is offered a 40-year lease on 50 acres of grade 3b grassland at £1,000 per acre, rising 2% a year. The land currently earns nothing beyond grazing, which continues under the panels. These are the default inputs of the solar farm income calculator.
- First-year rent: 50 x £1,000 = £50,000.
- Final-year rent: £50,000 x 1.02 to the power 39 = £108,237.
- Total over 40 years: £3,020,099 before tax.
- Today's value at 3.5%: £1,525,969, about half of the total, because later payments are discounted.
- Farm size: 50 acres at 5 acres per MW, about 10 MW, so the rent is about £5,000 per MW a year.
If the offer were £850 per acre with no indexation for 25 years, the same land would earn £42,500 a year and £1,062,500 in total, which shows why the indexation clause and term deserve as much attention as the headline rent.
Frequently Asked Questions
How much rent does a solar farm pay per acre in the UK?
Published guides from UK law firms and an energy developer quote about £750 to £1,200 per acre a year, most often around £1,000. These are not official figures and date from 2022 and 2023, so replace the example rent with the figure in your own offer.
How many acres do you need for a solar farm?
Fixed panels in northern Europe need more than 2 hectares, about 4.9 acres, per megawatt. UK guides give about 25 acres for a 5 MW farm. Developers usually look for sites with a nearby grid connection that has spare capacity, which matters more than size alone.
How long is a solar farm lease?
Published UK guides quote lease terms of 25 to 50 years, with 30 to 40 years common, often after a 3 to 5 year option while the developer seeks planning and a grid connection. The exact term is set in the heads of terms and lease.
Is solar farm rent index-linked?
Usually. One UK developer says its rent is linked to CPI and rises every year, and law firm guides describe index-linked rent as standard. Check whether your lease uses CPI or RPI and whether increases are capped, then enter the expected rate.
Can I still graze sheep on a solar farm?
Often yes. Developers describe sheep grazing between and under panel rows as normal, and panels and equipment cover only part of the leased area. Grazing rights should be written into the lease so both sides know who manages the grass.
Does the solar farm income calculator include tax?
No. All figures are before tax. Rental income is taxable, and leasing land for solar can affect agricultural reliefs, so ask an accountant or tax adviser to review the lease before you sign it.
Checked October 2026 by the Solaxyra Editorial Team. Sources: Wikipedia: Photovoltaic power station, GOV.UK: National Policy Statement EN-3 (2025), Lightsource bp: UK landowner brochure, Stephens Scown: Solar farms, benefits for landlords, Myerson: Solar farms, benefits and considerations for landowners.