The UK's solar energy sector is experiencing rapid growth: over 2,200 grid-scale solar projects are now approved or in planning, with a combined pipeline well past 35 GW. The government's Clean Power 2030 Action Plan targets 45-47 GW of solar by 2030, so the race is on to build more.
Previously, we've explored '11 ways Searchland helps renewable companies find land'. This time, we delve deeper into the specific criteria that land acquisition teams must consider when identifying prime locations for solar energy projects.
Finding the ideal site for a solar farm is a complex task, influenced by factors such as land size, location, and planning status. While some of these are essential, other considerations can be a bit more flexible. Below we examine the key criteria for solar farm site selection.
Proximity to grid connection
The success of a renewable energy project often depends on securing a cost-effective grid connection. This is especially true for solar or battery storage projects, which need access to at least a 33kV (33,000-volt) grid connection, and a substation with enough spare capacity (or headroom) to support the energy you are generating. Typically developers should be looking for sites within 2 miles of a suitable substation.
- If the grid connection is on the planned site, things are much easier. If a connection is near the site but not on it, a third-party access agreement would be required, which adds complexity and cost.
- If there is a suitable grid connection, you may need to act quickly. A substation available today may no longer be viable in six months.
- Just because electricity lines are close to a prospective site, don’t assume there is a suitable grid connection. It might be good news, but it might not: the line’s voltage could be too low, or there might not be enough capacity in the network.
One thing that's changed since 2025: proximity to a substation with headroom is no longer enough on its own. Under Ofgem's "First Ready, First Connected" grid reform, projects now need secured land rights and demonstrable planning progress before they can get a firm connection date - a speculative application can no longer hold a queue slot just by applying early. Searchland's DNO Tool can help you check both the substation capacity and how a site's location aligns with Clean Power 2030's regional targets.
Distance to infrastructure
Easy access to main roads is vital. It facilitates the transportation of materials and equipment, keeping transport costs to a minimum, which is crucial in reducing the overall expenditure of the project.
Legal status of land
If there's one critical aspect that can immediately hinder your energy farm project, it's securing solar farm planning permission. Local land policy and planning constraints are what determine whether that permission is realistic, so evaluating these factors should be your primary step when you come across a site that appears to meet all your requirements.
- Protected land: Generally, land for solar or battery storage projects should not be within a national park, nature reserve, area of outstanding natural beauty (AONB), or site of special scientific interest (SSSI). However, exceptions may exist in certain cases.
- Agricultural land classification: Land should not typically be high-quality agricultural land reserved for farming (referred to as “best and most versatile” land in England and Wales, and “prime” agricultural land in Scotland). In some regions where land is scarce, local authorities may be more flexible.
- Flood zones: Ideally land should be outside flood zones. Development is still possible in flood zones 1 and 2 (areas with low to medium flood probability), provided a flood risk assessment is conducted and necessary design mitigations are implemented.
Size of site: solar farm land requirements
How much land do you need for a solar farm? It comes down to the size of the land parcel, and how much of it you're actually permitted to use. Local towns and authorities usually don't permit full coverage of the entire parcel - typically, they'll allow somewhere in the vicinity of 60% of the total acreage to be covered.
For a solar farm, which demands more space, the minimum requirement is usually around 50 acres. This area must be consolidated into a single site rather than scattered across multiple, disconnected smaller plots.
In contrast, battery storage facilities have much more modest space requirements. A parcel of just two or three acres is typically sufficient for these installations.
Weather conditions and sunlight
For solar power projects, location plays a crucial role in determining viability. Land in the southern regions of the UK, particularly the southeast along the coast, is often most suitable due to its sunnier climate. As you move further north, the feasibility of solar projects can decrease - but that doesn’t mean you should rule it out.
While sunshine is key for solar panels, you want to make sure that they don’t overheat. According to manufacturers’ standards, 25°C is the optimum temperature for solar panels to operate.
Proximity to residential areas
When selecting a site for solar or battery storage projects, it's preferable to choose land that's not too close to residential areas, due to several considerations:
- Noise from battery storage: The air conditioning units necessary for battery storage systems can generate significant noise.
- Community reception to solar farms: The development of solar farms can sometimes be contentious. While many people support solar energy for its role in combating climate change, others may have reservations.
Terrain suitability
When evaluating your land for a renewable energy project, certain practical features can significantly impact its suitability. As with a traditional agricultural farm, the quality of the terrain will play a significant role in determining the viability and success of the project. Solar developers are seeking clear, flat land, with little to no wetlands, and minimal incline (5 degrees maximum).
Land topography:
- For solar: Ideally, the land should be flat or on a gentle south-facing slope. Slight undulations are manageable, but steep inclines or north-facing orientations are less ideal.
- For battery storage: While flat terrain is also preferred, the construction on a concrete base provides some flexibility to accommodate unevenness.
Vegetation and tree cover:
- For solar: Tall trees, particularly on the southern side of the site, can pose challenges by casting shadows over the panels. While it's possible to manage a few trees on one boundary, a site free from tall trees is generally more desirable.
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Finding the perfect site for your solar project involves considering a multitude of complex factors. Searchland simplifies this process by bringing together essential data through an array of specialized tools, all in one accessible platform. Our tools include:
Proximity filter: Locate sites within a certain distance from important local infrastructure like roads and towns.
DNO Tool: Access critical details on substations, network capacity, and cable infrastructure.
Solar Tool: Identify the best areas in the UK for optimal sunlight and temperature conditions.
These tools are designed to work together seamlessly. Want to use the proximity filter with the DNO tool to locate nearby substations? No problem.
This functionality not only surfaces a vast array of potential sites but also enables the quick elimination of unsuitable options, focusing efforts on the most promising locations. The true value of Searchland lies in its ability to transform an overwhelming selection process into a streamlined journey, leading directly to those golden sites ideal for your energy development project.
