Westmill Solar Grazing: Sheep Support Sustainable Photovoltaic Maintenance

Solar energy production and sustainable livestock farming are being integrated in ways that are changing photovoltaic power station maintenance worldwide. At the Westmill park in England, a flock takes control of low-growing vegetation, creating strong ecological balance across the site.

Why does solar grazing replace traditional mowing?

Grass growing around solar installations can obstruct access routes, complicate inspections and cast shade over photovoltaic modules. To address this, power stations traditionally relied on frequent mowing with heavy machinery, resulting in high costs and significant fuel consumption.

At Westmill solar park, the introduction of forty sheep has replaced a large proportion of mechanical work across the site. The animals can reach narrow passageways and areas beneath the panels, where conventional mowers operate with difficulty and demand excessive time from operators.

Why do the sheep graze only in winter?

The flock’s seasonal schedule protects ground-nesting birds and ensures that native flowers… Read more

How do the animals and solar panels interact in the field?

The animals move continuously around the solar park without affecting the operation of the photovoltaic modules, keeping electricity generation stable. The panels provide comfortable shade from intense sunshine and create safe shelter from rain and strong winds for the sheep.

By feeding on local vegetation, the sheep carry out natural trimming that keeps the green cover at an appropriate height. Their droppings also return valuable nutrients to the ground, sustainably encouraging the site’s biological fertility.

Watch the following video content from the PBS North Carolina YouTube channel, which shows how grazing works at solar power stations:

Which sheep breeds are used in the project?

Animal selection for the Westmill project focused on traditional English breeds recognised for their docile nature and resilience in field conditions. Sheep from the Cotswold and Lincoln lines were introduced to the solar area because of their excellent ability to coexist with the installation and their notable adaptation to the panels in place.

These animals graze regularly without damaging electrical cables or the metal structures secured to the ground. The suitable size of these traditional breeds allows safe movement through the access corridors, permanently maintaining the integrity of the entire photovoltaic power station.

Agrivoltaic Management

Pillars of Natural Management

Factors that support coexistence between the flock and photovoltaic generation:

1. Careful selection of animals, using breeds suited to the environment;
2. Management of sheep numbers in proportion to the size of the land;
3. Ongoing provision of water and animal health care.

Why does grazing take place only during winter?

The grazing timetable was strategically designed to prevent negative effects on the park’s native wildlife. During winter, ground-nesting birds are not in their breeding period, ensuring effective protection and reducing any risk to nests.

By removing the flock before spring, the land can support the full flowering of meadow vegetation in the warmer seasons. This approach protects nectar-producing plants that provide plentiful food and deliver biological support for local bees and butterflies.

The ecological conservation achieved through this seasonal management includes several practical ecosystem benefits:

• No trampling of nests during the critical breeding stage;
• Natural growth of wildflowers in the warmer seasons;
• A stable supply of nectar and pollen for pollinating insects.

How does agrivoltaics redefine land use?

The initiative developed at Westmill shows that solar parks do not need to treat land as an empty space between pieces of equipment. The planned combination of electricity generation and pasture management establishes an innovative model that values rural activity in photovoltaic areas.

With continuous environmental monitoring and respect for seasonal cycles, agrivoltaics strengthens partnerships with local livestock farmers and reduces dependence on herbicides. This integrated method fosters harmonious coexistence between modern infrastructure and nature conservation in productive countryside.