Solar Parks and Biodiversity 2026: What Studies Show — and Why It Makes Leasing Your Land Easier
Does a solar park displace nature? On formerly intensively farmed cropland, studies show the opposite: where the land used to be plowed, sprayed, and fertilized, extensive grassland grows for 20–40 years — and insects, birds, and species diversity measurably return with it. For you as a landowner, this is more than a clear conscience: the biodiversity balance weighs into the municipal council's decision on whether your project gets its development plan — and with it, whether and when your lease income starts flowing. This article shows what the research finds, which requirements are typical, and which arguments win in conversations with the municipality.
Key facts at a glance
The mechanism: A classic ground-mounted solar park replaces intensive farming with extensive grassland — no pesticides, no mineral fertilizer, just one or two mowings per year or sheep grazing, and 20–40 years of soil rest.
The evidence: A study of 32 solar parks in Slovakia, published in 2024, found more bird species and around 30% more birds than on adjacent control plots; a German field study documented gains for butterflies, grasshoppers, and breeding birds.
Why it concerns you: The municipality decides on the development plan — a project with a demonstrable biodiversity gain is easier to approve. Higher permitting chance = earlier lease income (typically €3,000–5,000/ha per year).
Agri-PV is different: Under dual use, intensive farming continues — the biodiversity gain is largely lost there.
First step: Whether your land lies outside protected areas and fundamentally qualifies, the free ENLAPA area check tells you in seconds.
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What actually happens on the land: from intensive cropland to extensive grassland
To understand why solar parks help biodiversity, look at the starting condition: most ground-mounted solar parks are built on intensively farmed cropland — plowed annually, sprayed, mineral-fertilized. For farmland birds, insects, and soil life, this is among the most species-poor habitats our landscape has to offer.
With the solar park, the regime changes completely:
- No pesticides, no mineral fertilizer — for the entire 20–40-year operating life.
- Extensive grassland between and under the module rows, maintained with one or two mowings per year or sheep grazing.
- Soil rest: no plowing, no tillage — humus build-up and soil life can recover.
- Low disturbance: fenced, no public traffic, no hunting pressure — a refuge that hardly exists elsewhere in the agricultural landscape.
- Fully removable: mounting posts are usually rammed, not set in concrete; after decommissioning the land is available again, often in better soil condition than before.
Exactly this switch — intensive farming out, extensive grassland in — is the core of the biodiversity gain. It is also the reason agri-PV does not deliver this effect: there, intensive use simply continues (more below).
What studies show: more birds, more insects, more species
The body of research is growing, and the results point in a clear direction.
The Slovakia study (2024): A research team led by Benjamín Jarčuška surveyed 32 solar parks in the agricultural landscape of southwestern Slovakia and compared them with 32 directly adjacent control plots — published in 2024 in the Journal of Environmental Management. The result: the solar parks held more bird species and around 30% more birds (353 counted individuals from 41 species versus 271 from 40 species on the control plots). Insect-eating species benefited in particular — an indication that the food base, the insect world, is richer inside the parks. Species such as the black redstart, European stonechat, and white wagtail were noticeably more common in the parks. The authors attribute this to the vegetation that develops around the modules: it provides food, cover from predators, and nesting opportunities. To be fair: the study covers one breeding season, and as with any field study there is an ongoing methodological debate — but the direction of the finding matches what is being measured elsewhere too.
The German field study: In 2019, the industry association bne published "Solar Parks — Gains for Biodiversity," a survey of existing German installations. It documented species gains compared with the surrounding agricultural landscape, particularly for butterflies, grasshoppers, and breeding birds — and one practical lever: wider sunlit strips between module rows further increase species and individual numbers.
Important context: these gains apply to the standard case of intensive cropland becoming a solar park. Building over species-rich grassland or biotopes would yield a different balance — which is exactly why permitting practice and subsidy rules exclude such land, and exactly why the area check screens protected areas first.
Why biodiversity helps decide your lease income
A ground-mounted solar park normally requires a development plan — and the municipal council adopts it. In that weighing process, landscape and nature are regularly the critical points where projects get stuck; the criteria are explained in detail in Ground-Mounted PV Approval.
This is where biodiversity turns from an ecological question into an economic one:
- Permitting chance: A project that can show it ecologically upgrades the land rather than "sealing" it removes the basis of the most common objection. Municipalities that already host an extensively maintained park tend to find the next one easier to approve.
- Procedure duration: Every objection and every extra deliberation round costs months. A convincing greening and maintenance concept from day one shortens the path to the final zoning decision — and thus the time to your first lease payment. At typical rates of €3,000–5,000/ha per year, every month saved is real money.
- Project stability over the lifetime: A park that is locally perceived as a gain faces fewer conflicts over 20–40 years — which also stabilizes your lease relationship.
Typical requirements: greening, flowering strips, maintenance concept
What municipalities usually stipulate in the development plan — and what it means for you:
- Perimeter greening with hedges or shrub rows (visual screening + habitat).
- Flowering strips or areas along edges and between module fields.
- A fence with ground clearance so small animals such as hares, hedgehogs, and amphibians can cross the site.
- A maintenance concept: extensive mowing (with defined mowing windows) or sheep grazing, no pesticides or fertilizer.
- Sometimes monitoring obligations or structural elements (stone piles, deadwood, nesting aids).
Important for lessors: implementing and paying for these requirements is the project developer's or operator's job, not yours. What matters for you is only that greening and setbacks occupy part of the land that will not carry modules — serious developers factor this in from the start. In lease negotiations, actively ask about the greening and maintenance concept: a developer with a well-thought-out answer here is also the stronger partner in the permitting process.
Arguments for the conversation with the municipality
Whether you present your project to the municipal council as the landowner or weigh a zoning resolution as the mayor — these are the points that carry in the deliberation:
- The land is not sealed, it is repurposed. Rammed posts instead of concrete, less than 5% of the ground actually built over, fully removable — after the operating life it is cropland or grassland again.
- Intensive cropland becomes extensive grassland for 20–40 years. No pesticides, no mineral fertilizer, soil rest — de facto a long-term extensification program that costs no subsidy money.
- The species balance is measurably positive. Studies from Slovakia (more bird species, around 30% more birds than on neighboring plots) and Germany (butterflies, grasshoppers, breeding birds) document the gain over the agricultural landscape.
- Greening and maintenance can be made binding. The municipality sets hedges, flowering strips, fence ground clearance, and the mowing concept in the development plan — it shapes the project rather than merely approving it.
- Value creation stays local. Lease payments to local owners, trade tax, and the municipal participation under Section 6 of the German Renewable Energy Act (EEG) — the park visibly pays into the community.
- Choose the honest benchmark: not "solar park versus flower meadow," but "solar park versus the intensive cropland that stands there today." Against that real starting condition, the park wins.
And agri-PV? The biodiversity gain is largely lost there
Intuitively, "farming plus solar" sounds more ecological than "solar only" — in practice it is usually the other way around. The classic solar park's biodiversity gain arises precisely because intensive farming stops and extensive grassland replaces it. Under agri-PV, intensive use continues between and under the modules: spraying and fertilizing go on, the soil rest disappears, the habitat switch never happens. What remains are edge strips — the area-wide effect is missing. On top of that, agri-PV needs more land for the same power output and also pays considerably less lease than a classic park — the full assessment from a lessor's perspective is in our guide on agri-PV disadvantages.
Limits: what a solar park is not
For honesty's sake — three caveats belong in every municipal conversation, because they will come up anyway:
- A solar park is not a nature reserve. It upgrades species-poor farmland; it does not replace biotopes, peatlands, or species-rich meadows. On such land it is rightly not permitted.
- The effect depends on site and maintenance. Without an extensive maintenance concept (or with gravel instead of grassland, as is common in some other countries), the gain is smaller — which is why the maintenance concept belongs in the development plan.
- The landscape changes. That is the real price, and greening only softens it. Addressing it openly and placing the ecological gain next to it makes for the more credible debate.
Whether your land lies outside the exclusion zones, the free area check clarifies in seconds — protected areas, zoning, and rough grid proximity, without providing any personal data.
What you can do right now as a landowner
- Check your land: Use the area check to find out in seconds whether your land lies outside protected areas and fundamentally qualifies for a solar park.
- Use the biodiversity argument early: Do not wait until a developer is chosen — an early, open line to the mayor with the arguments from this article paves the way for the later zoning resolution.
- Ask developers for their concept: Greening, maintenance, and perimeter planting belong in every serious offer. Compare several offers — on lease terms too.
- Don't waste time: Permitting and grid connection take years anyway — in one case we documented, a grid connection request sat at position 99 in the queue, behind requests totaling 4,753 MW, around eight months of waiting. The full process is explained in Building a Solar Park 2026.
Frequently asked questions
Conclusion
On intensively farmed cropland, a classic ground-mounted solar park is not a burden on nature but usually a measurable gain: extensive grassland instead of pesticides and plow, more birds, more insects, more species — for 20–40 years, fully removable. For you as a landowner, that is a tangible argument: it raises the chance of getting the development plan and shortens the path to your first lease payment. Check now in seconds with the free ENLAPA area check whether your land fundamentally qualifies — or list your land on our marketplace and receive no-obligation lease offers from project developers. How the leasing process works in detail is covered in Lease Land for a Solar Park; whether arable land or grassland — the biodiversity gain is one of your strongest arguments either way.