Solar Farm Sheep Grazing: How Effective Is It?

Agrivoltaics, the practice of combining solar energy production with livestock grazing, is being utilized on solar farms to reduce vegetation maintenance costs and support agricultural productivity. According to reporting by 1News, sheep grazing serves as a biological alternative to mechanical mowing or chemical herbicides to keep grass from shading solar panels.

The integration of sheep on solar sites allows landholders to maintain two revenue streams from a single plot of land. This dual-use model addresses the land-use conflict between expanding renewable energy infrastructure and traditional farming operations.

Solar developers often face high operational expenses related to vegetation management. Overgrown grass can block sunlight from reaching the photovoltaic cells, reducing the energy output of the farm. 1News reports that sheep provide a cost-effective method of keeping this growth in check without the need for heavy machinery that could damage the panels or the soil.

The effectiveness of this system depends on specific livestock management and infrastructure choices. Not all livestock are suitable for solar farms; for instance, cattle are generally avoided because their weight can damage the ground and their height poses a risk to the equipment. Sheep are preferred due to their smaller size and grazing habits.

According to 1News, the success of solar grazing involves several critical operational factors:

• Panel Height: Panels must be installed high enough off the ground to allow sheep to move freely beneath them.
• Fencing: Secure perimeter and internal fencing are required to prevent livestock from escaping or entering sensitive electrical zones.
• Stocking Rates: Farmers must manage the number of sheep per hectare to ensure the grass is grazed effectively without overgrazing the land.
• Water Access: Solar farms must provide integrated water troughs and troughs that do not interfere with the electrical infrastructure.

The environmental impact of agrivoltaics includes improved soil health. 1News notes that grazing sheep can help maintain the soil’s organic matter and prevent the soil compaction that often occurs when heavy industrial mowers are used across a site.

From a business perspective, this model shifts a portion of the solar farm’s maintenance burden to a third-party agricultural operator. This can lower the overall Levelized Cost of Energy (LCOE) by reducing the frequency of contracted mechanical weeding services.

However, the model requires a precise partnership between the energy company and the farmer. The farmer assumes the risk of livestock management, while the energy company must ensure the site is safe for animals, including the mitigation of risks associated with electrical cabling and grounding.

As solar deployments increase globally, the adoption of agrivoltaics is viewed as a way to increase public and political acceptance of large-scale solar projects, particularly in rural areas where the loss of productive farmland is a primary concern.