Energies Media
The Mojave Desert outside Las Vegas looks barren to most passing eyes. But tucked beneath the scrub and sand lives the threecorner milkvetch — a rare flowering plant that sprawls low across the ground, waiting for desert rains to bloom. Scientists counted just 12 of them on one patch of land before construction crews arrived to build a solar farm.
Solar development typically means the end of exactly this kind of fragile ecosystem. Companies routinely blade and grade sites — scraping away vegetation and flattening the soil, destroying the seed banks that native plants depend on to survive.
What happened next at the Gemini Solar Project wasn’t supposed to be possible.
By 2024, that count of 12 threecorner milkvetch plants had jumped to 93. The seed bank had survived construction entirely intact — and the plants weren’t just surviving. Compared with specimens at a nearby undisturbed plot, the Gemini plants grew wider, taller, and produced more flowers and fruits. Something about the solar farm was actively helping them thrive.
Researchers believe the explanation lies in shade. Solar panels slow soil evaporation, keeping more moisture in the ground — and in a desert ecosystem where water limits nearly everything, that shift matters enormously. “There’s seedlings of so many other species coming up as well,” said Tiffany Pereira, an ecologist at the Desert Research Institute and lead author of the study. “The fact that the seed bank survived is phenomenal.”
The stakes are real. The threecorner milkvetch is currently under consideration for listing under the Endangered Species Act — and a solar farm, of all things, may be offering it a lifeline.
The standard approach to solar construction is called blade-and-grade: vegetation is cut, soil is leveled, and the seed bank beneath is effectively destroyed. It’s efficient for builders but catastrophic for native ecosystems. Without root structures holding soil together, erosion moves in fast, according to the Desert Research Institute.
Bare soil is an open invitation. Invasive species are opportunistic and aggressive, crowding out the native plants that indigenous pollinators — like bumblebees — depend on. The result is a landscape that looks green from a distance but functions poorly as habitat.
Ecovoltaics is the alternative. Instead of clearing a site, developers build with native species in mind from the start, seeding the soil with native grasses and wildflowers rather than stripping it bare. “Some of those seed mixes do quite well at solar facilities, and they attract pollinators, birds, and other wildlife as a result,” said Lee Walston, an ecologist at Argonne National Laboratory. On former agricultural fields, the approach can actually restore soil and plant communities toward something closer to their natural state — especially in prairie ecosystems that evolved alongside repeated disturbance.
The Nevada results aren’t an isolated case. Walston led a five-year study of two solar installations built on converted cropland in Minnesota, and the numbers are striking. Unique flowering plant species increased sevenfold. Insect pollinators tripled in abundance. Native bee populations alone grew by a factor of 20.
A follow-on study across a dozen solar sites found grassland birds flocking to these areas, drawn by the surge in insect life. Bats followed for the same reason, and researchers observed birds nesting among the panels, using the structures as shelter from predators. “We’ve seen positive outcomes sort of across the board,” Walston said. The logic holds: more insects mean more food for birds and bats, and once the plant base recovers, the rest of the food web tends to follow.
Not every solar farm produces these results automatically. Design choices matter — sometimes enormously.
Panel height is one of the most critical variables. Taller supports allow larger plant species to reach their full growth potential beneath and between the arrays, but higher supports cost more to build, creating real tension with project economics. Developers must weigh habitat goals against construction budgets. Shade tolerance also varies by species — at the Gemini site, Pereira found only one threecorner milkvetch growing directly under a panel. The rest were thriving in sunlit gaps between rows, not in the shade itself, but benefiting from the moisture that nearby shade helped preserve.
Some facilities use conservation grazing — sheep and goats — to manage invasive weeds and reduce fire risk from accumulated dead plant material. It sounds disruptive, but it mimics natural disturbance cycles that historically involved deer, bison, and wildfires. Walston and his colleagues are working directly with developers to identify the best seed mixes and management strategies for whatever panel height a given project can accommodate.
A parallel approach called agrivoltaics is expanding the conversation further. Instead of native plants beneath the panels, some researchers are experimenting with food crops — and early results are promising.
Panels create a microclimate that buffers crops from temperature extremes in both summer and winter. Growing under panels uses roughly one-third less water compared with open-field cultivation, a meaningful advantage as drought pressure intensifies across agricultural regions. Researchers are now working to identify which high-value crops perform best under panels — on rooftops and at ground level — to make the economics viable for farmers. The broader vision is ambitious: solar farms that generate clean energy, restore native biodiversity, and contribute to the food supply, all on the same footprint of land.
For decades, the trade-off between energy development and ecological preservation has felt fixed — build the infrastructure, lose the habitat. The research coming out of Nevada and Minnesota suggests that trade-off isn’t as inevitable as it seemed.
“Rather than a moonscape of invasive species and dust blowing into cities, why not strive for something better?” Pereira said. The 93 threecorner milkvetch plants now flowering beneath the Nevada sun are a small but concrete answer to that question. They raise a larger one: how many other landscapes, written off as sacrifice zones for infrastructure, might respond the same way if we simply chose not to scrape them bare?
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and is multilingual.
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and is multilingual.
Carlos is an engineer with strong expertise in technical and industrial topics. He previously worked at international companies such as Siemens and is multilingual.

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