January 5, 2024
“Agrivoltaics,” is a new buzzword in solar energy circles. The term applies to land used for agriculture (“agri”) and for generating solar energy (“voltaics”) by solar panels. Agrivoltaics can refer to just a few solar panels mounted on ground-based structures (as opposed to rooftops) or a whole field of them, with crops or animals grazing underneath.
A successful agrivoltaic project has some type of farming thriving adjacent to or under the panels, with the panels generating sufficient power to justify the economics of constructing and installing them. That can be a tall order—but not an impossible one. Agrivoltaics projects are very much in the research phase. The approach is not a fully proven yet, though it’s being viewed as workable under the right circumstances. For now, much of what’s known about agrivoltaics has come from research in dry areas in the western U.S. Some of these areas are sunnier and hotter than the Mid-Atlantic region in the summer and colder in the winter. Thus, agrivoltaic projects that are successful out west aren’t necessarily relevant to the Mid-Atlantic.
Other concerns and potential downsides are emerging. Ground solar panels can disturb and compact soil. They also decrease the amount of sun that reaches plants, affecting photosynthesis. And ground panels can adversely affect how much rain reaches plants and in what pattern. For example, run-off from panels can cause water to pool in some areas. Another practical concern is how farmers get equipment in and around ground panels. All these issues, and others, are being studied.
Agrivoltaic proposals for the Ag Reserve
In 2020, Montgomery County adopted a zoning change that allowed solar arrays on land zoned for agriculture in Montgomery’s County’s Ag Reserve. The measure was a compromise. It recognized the need to generate more renewable energy in the county while at the same time preserving farming, especially on the county’s best soils. The measure also encouraged more production of rooftop solar. It increased the allowable amount of solar production for landowners from 120% of their personal use to 200%. That meant people could sell any excess solar electricity they generated back into the electricity grid. Community solar arrays, which are smaller than “utility scale” arrays, are also allowed under the measure. They can produce up to 2 megawatts of electricity, and generally require 10 to 12 acres of land. Importantly, placing solar arrays on farming soils designated class 1 or class 2 (high quality soils) is prohibited.
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