Solar farms can be havens for rare plants. Just ask the threecorner milkvetch.
In the desert outside of Las Vegas, the Gemini Solar Project took a gentler approach, instead trying to preserve the ecosystem. According to a new study, it paid off for the threecorner milkvetch: Before the development, scientists found 12 plants on the site, and afterward in 2024 found 93, signifying that the seeds survived construction. Compared to a nearby plot of land, the plants at Gemini grew wider and taller, and produced more flowers and fruits. That might be because the solar panels shade the soil, slowing evaporation, which makes more water available to the plants to grow big and strong. “So you just have the potential for a lot more plants,” said Tiffany Pereira, an ecologist at the Desert Research Institute and lead author of the paper, which was published late last year. “There’s seedlings of so many other species coming up as well. And so the fact that seed bank survived is phenomenal.” It’s yet more evidence that solar farms can be built in ways that minimize disturbances to ecosystems. (The company behind the Gemini project, Primergy, did not respond to requests for comment.) This technique is called ecovoltaics: Instead of blade-and-grade, facilities are built with native species in mind. To give the ecosystem a boost, for instance, a crew can seed the soils with native grasses and flowers. “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 who wasn’t involved in the new paper. “Sort of asking that umbrella, Field of Dreams, question, right: If you build it, will they come?”