Solar, wind, hydro, biomass and batteries can reduce energy costs, create additional income and make a farm less exposed to volatile energy prices — but only when the system suits the farm, the grid connection works, planning is understood and the financial case survives realistic assumptions.
Renewable energy has become one of the biggest diversification opportunities available to farms.
A modern agricultural business may consume substantial amounts of electricity and heat through grain drying, milk cooling, ventilation, refrigeration, irrigation, workshops, lighting, pumps, poultry housing, livestock buildings and domestic accommodation.
That creates an obvious question:
Instead of buying all that energy, could the farm produce some of it itself?
For many farms, the answer is yes.
But renewable energy should not begin with choosing solar panels, a wind turbine or a battery.
It should begin with understanding when, where and how the farm uses energy.
A badly designed renewable project can tie up large amounts of capital while producing electricity when the farm does not need it. A well-designed system can reduce purchased electricity, protect the business against future price increases and, in some cases, create another income stream.
The most important principle is therefore simple:
Do not buy renewable technology first and work out how to use the energy afterwards. Measure the farm's energy demand first, then design the technology around it.
1. Start with your electricity bills, not a solar brochure
Before requesting quotations, collect at least 12 months of electricity and fuel information.
Ideally, examine several years.
Record:
- Annual electricity consumption.
- Monthly electricity consumption.
- Day and night usage.
- Half-hourly consumption where available.
- Maximum electrical demand.
- Electricity unit price.
- Standing charges.
- Heating oil, LPG, gas or biomass consumption.
- Diesel used for stationary processes.
- Major electrical equipment.
- Seasonal peaks.
- Planned expansion of the farm.
This matters because two farms using exactly 100,000 kWh per year may require completely different renewable systems.
A dairy farm may have relatively consistent daily electricity demand from milking, refrigeration and water heating.
A grain enterprise may use enormous amounts of energy during harvest and relatively little during the rest of the year.
A poultry farm may require continuous ventilation and heating.
A horticultural business may have substantial pumping, refrigeration or glasshouse demand.
Therefore, annual energy use alone is not enough.
The timing of consumption matters just as much as the total amount consumed.
2. Solar PV: Often the first renewable technology farmers consider
Solar photovoltaic panels convert daylight into electricity.
Agricultural buildings can offer excellent installation opportunities because barns, poultry sheds, stores, dairies and
workshops often have large roof areas.
Solar can potentially supply electricity for:
- Milk cooling.
- Refrigeration.
- Ventilation.
- Pumps.
- Workshops.
- Offices.
- Grain handling.
- Electric vehicle charging.
- Water heating through electrically powered systems.
- Battery charging.
The most valuable solar electricity is often the electricity you use yourself
Suppose the farm normally pays 25p per kWh for electricity.
If a solar array produces electricity that is immediately consumed on the farm, the business may avoid purchasing that unit at approximately the retail electricity price.
If the same electricity is exported, the farm may receive a different and potentially lower export payment depending on its tariff or agreement.
This means self-consumption can be extremely important to project economics.
A solar installer may proudly say:
“This system will generate 100,000 kWh per year.”
The better question is:
How much of those 100,000 kWh will my farm actually use when they are generated?
3. Roof-mounted solar or ground-mounted solar?
Roof-mounted solar
Agricultural buildings can make excellent locations because the panels use an existing structure rather than occupying additional land.
However, farmers should investigate the roof before installing anything.
Consider:
- Structural loading.
- Roof condition.
- Remaining roof life.
- Asbestos-containing materials.
- Orientation.
- Shading.
- Access for installation.
- Fire separation.
- Insurance requirements.
- Future building alterations.
Installing a solar array expected to operate for decades on a roof that will require replacement in five years could create unnecessary expense.
A structural assessment may therefore be one of the most valuable parts of the project.
Ground-mounted solar
Ground arrays can allow better orientation and easier maintenance.
However, they can affect agricultural land use and may face more complex planning considerations.
In England, government planning guidance places particular emphasis on considering agricultural land quality and protecting the best and most versatile agricultural land from significant inappropriate development. GOV.UK
The planning position depends on the location, scale and circumstances of the development, so the local planning authority should be consulted before committing to a project. GOV.UK specifically advises farmers to check whether permitted development rights apply and whether approval or full permission is required. GOV.UK
4. Do not assume planning permission is automatic
One of the biggest mistakes in farm renewable development is assuming:
“It is agricultural land, so I can build it.”
That is not necessarily correct.
Planning requirements can depend on:
- Technology.
- System size.
- Location.
- Building type.
- Listed-building status.
- Conservation areas.
- Landscape designation.
- Agricultural land classification.
- Height.
- Noise.
- Visual impact.
- Access.
- Ecological effects.
Some agricultural development can benefit from permitted development rights, but conditions and limitations apply. GOV.UK recommends checking with the relevant local planning authority before starting work. GOV.UK
Never place a large equipment order on the assumption that planning will be straightforward.
5. Grid connection: The part of the project many farmers discover too late
A renewable installation may produce electricity perfectly while still being unable to export everything it generates.
Why?
Because the local electricity network has limited capacity.
Before installing larger generation systems, farmers may need approval from the relevant Distribution Network Operator, commonly called the DNO.
Depending on the project, the network may require:
- Connection studies.
- Additional protection equipment.
- Export limitations.
- Network reinforcement.
- New transformers.
- Cable upgrades.
- Connection charges.
In some locations, export capacity can become the factor that determines whether a project is financially viable.
Example
Imagine a farm proposes a:
250 kW solar installation
but the network operator allows only:
100 kW maximum export.
That does not necessarily make the project impossible.
The farm might:
- Consume more electricity on site.
- Install export-limiting equipment.
- Add battery storage.
- Reduce system size.
- Change the project design.
But that should be known before substantial capital is committed.
Always investigate grid capacity early.
6. Solar does not mean electricity independence
Solar output varies throughout the day and year.
Generation is generally strongest around daylight hours and during sunnier months.
A farm requiring substantial electricity at 5am, 10pm or throughout winter cannot assume solar alone will cover those requirements.
This creates the fundamental renewable-energy problem:
Generation does not always happen when demand occurs.
That is where energy storage becomes important.
7. Farm battery storage
Battery systems store electricity for use later.
They can potentially store:
- Excess solar generation.
- Wind generation.
- Cheaper off-peak grid electricity.
and release it when electricity would otherwise be purchased at a higher price.
Government planning guidance recognises battery energy storage as an important part of integrating intermittent renewable generation and providing electricity-system flexibility. GOV.UK
Batteries can help farms:
- Increase solar self-consumption.
- Reduce peak electricity demand.
- Shift electricity use between tariff periods.
- Limit grid export.
- Provide some resilience where the installation is designed for backup operation.
- Participate in some energy-market services where commercially available.
But batteries require careful financial analysis.
8. Understand kW and kWh before buying a battery
These two numbers are frequently confused.
kW = power
This describes how quickly energy can be delivered.
kWh = energy capacity
This describes how much energy is stored.
Consider a:
100 kW / 200 kWh battery.
It could theoretically provide approximately:
- 100 kW for 2 hours,
- 50 kW for 4 hours,
subject to system limits, efficiency, state of charge and usable capacity.
A farm requiring 250 kW during a peak cannot assume that a 50 kW battery will remove that peak simply because the battery has a
large kWh capacity.
Both numbers matter.
9. Battery degradation is part of the cost
Batteries do not retain their original usable capacity forever.
Performance can decline with:
- Age.
- Number of cycles.
- Temperature.
- Depth of discharge.
- Operating conditions.
When comparing battery quotations, ask:
- What is the usable capacity?
- What is the warranted capacity after 10 years?
- How many cycles are covered?
- What operating conditions apply to the warranty?
- Is inverter replacement included?
- What happens if individual modules fail?
- Who monitors the battery?
- Who owns the software/data?
- Is remote access dependent on a subscription?
The cheapest battery quotation may not represent the lowest lifetime cost.


