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MU Extension Works With County to Plan Solar Farm Growth
Missouri Ag Connection - 03/28/2024

The Montgomery County Planning and Zoning Commission asked University of Missouri Extension agronomist Rusty Lee to help develop a strategy to address growing interest in solar energy farms in the county in the early part of 2021. Two years ago, that strategy become a reality.

The commission wanted to guide development of solar farms while maintaining the integrity of existing residential and agricultural communities.

Montgomery County has defined solar farms as 20 contiguous acres or more of photovoltaic interconnected solar panels that convert sunlight into electricity. All solar farms in Montgomery County require a permit.

The commission sought to reserve land for future industrial growth along Interstate 70 and Missouri Highway 19 with a solar buffer, an area where ground-mounted solar is not allowed. They also wanted to protect the county’s farm ground by maintaining fertility and monitoring potential soil contamination in solar farm areas.

P&Z administrator Donna Viehmann sought Lee’s expertise and the resources of MU Extension to develop protocols. Viehmann holds a degree in agricultural science and serves on the county MU Extension council.

“I love MU Extension’s science-based approach to provide unbiased, relevant and reliable information that could help make informed decisions,” she says.

Viehmann and Lee worked together to establish agronomic practices to protect the land during and after the life of the solar facility. Throughout the process, they sought input from the community by setting up booths at the county fair and other events. They used in-person and online surveys and held more than 15 listening posts, group meetings and public hearings.

Based upon their recommendations, developers must send soil tests to MU’s Soil and Plant Testing Laboratory on the Columbia campus to establish baselines of pH, nutrients, soil texture, organic matter and the heavy metals cadmium and lead. Test are required every five years, and topsoil removed for construction must be returned to the original site.

P&Z requires planting cool-season grasses beneath the panels and in surrounding areas. Warm-season and native grasses can present a fuel load for brush fires. P&Z mandates that solar farm applicants submit an emergency management plan that requires emergency vehicles have easy access to solar farm sites.

The cool-season grasses provide erosion control, manage runoff and maintain soil health. County guidelines do not require grazing of grasses at solar farms, but the commission recommends it.

Infrastructure needs to solar farm grazing are the same as in conventional rotational grazing — water, fencing and shade.

Sheep is the preferred species to graze on solar farms, Lee says, because they are less likely than cows or goats to damage panels and wiring. Solar panel installations also provide their own tracking systems and offer a shade benefit. Tilting panels face the east in the morning and slowly rotate with the sun during the day. Livestock follow suit, seeking shade created by panels.

The vegetation management plan proposed by the solar company should include trees and grasses to provide an aesthetic buffer between solar farms and residential areas. Lee’s position as extension agronomist allows him to review the plan for noxious weeds and invasive species and make recommendations on the trees and grasses.

Zoning regulations also mandate a security fence and a 200-foot setback from solar panels. Applicants must also present a wildlife mitigation plan to document the presence of any endangered species and adhere to U.S. Fish and Wildlife Service guidelines.







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