Westmill Solar Grazing: Sheep Support Sustainable Photovoltaic Plants

The integration of solar energy production with sustainable livestock farming is reshaping the maintenance of photovoltaic plants worldwide. At the Westmill site in England, a flock takes control of low-growing vegetation, fostering strong ecological balance across the field.

Why does solar grazing replace traditional mowing?

Grass growing around solar infrastructure can obstruct access, make inspections harder and cast shade over photovoltaic modules. To address this, plants previously relied on frequent mowing with heavy machinery, resulting in high costs and substantial fuel consumption.

At Westmill solar park, bringing in forty sheep has replaced a significant share of mechanical work across the site. The animals can move through narrow corridors and 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 timetable 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 disrupting the photovoltaic modules, keeping electricity generation stable. The panels provide comfortable shade from intense sunshine while also offering safe shelter from rain and strong winds for the sheep.

By feeding on local vegetation, the sheep carry out natural trimming that maintains the green cover at an appropriate height. Their manure also returns valuable nutrients to the ground, sustainably boosting the site's biological fertility.

Watch the following video from the PBS North Carolina (YouTube) channel on YouTube, which shows how grazing works at solar plants:

Which sheep breeds are used in the project?

Animal selection for the Westmill project focused on traditional English breeds recognised for their calm nature and resilience in open fields. Sheep from Cotswold and Lincoln lines were introduced to the solar area because of their excellent ability to coexist and their notable adaptation to the installed panels.

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

Agrivoltaic Management

Pillars of Natural Management

Factors supporting coexistence between the flock and photovoltaic generation:

1. Careful selection of animals, using breeds suited to the environment;
2. Managing 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 schedule was strategically designed to avoid 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 during warmer seasons. This approach protects nectar-producing plants that provide plentiful food and sustain bees and butterflies in the region.

The ecological protection delivered by 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 consistent supply of nectar and pollen for pollinating insects.

How does agrivoltaics redefine land use?

The Westmill initiative shows that solar parks do not need to treat land as 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 reliance on herbicides. This integrated approach supports harmonious coexistence between modern infrastructure and nature conservation in productive countryside.