California’s endangered fox is surviving inside solar farms; how a small gap in the fence could help save them

A fence built to protect a solar farm’s equipment might also be helping one of California’s most threatened animals survive. The tiny San Joaquin kit fox has been found living among rows of solar panels, where access to prey and protection from larger predators may make an unexpected difference. The discovery offers a possible example of how renewable energy infrastructure can coexist with wildlife. But researchers stress that the outcome depends on how solar facilities are designed and managed.

How the tiny fox found home among solar panels

The San Joaquin kit fox is a small, nocturnal fox native to California’s San Joaquin Valley. Weighing up to about five pounds, it has been threatened by extensive habitat loss caused by agriculture, urban expansion and other development. According to research presented by the University of California, Santa Barbara’s Bren School of Environmental Science and Management, scientists studied foxes at two large solar facilities in San Luis Obispo County: Topaz Solar Farm and California Valley Solar Ranch.

Researchers tracked the animals over separate three-year studies conducted between 2014 and 2017, comparing foxes using the solar sites with those living in nearby reference areas. The findings challenged assumptions that industrial solar developments necessarily make poor wildlife habitat. Reproductive success was 86.7% at both the solar facilities and reference sites, while average home-range sizes were similar. The researchers also found that foxes used dens and hunted prey within the facilities.

Why a narrow gap in the fence matters

One detail could help explain how the foxes navigate the sites: the gap beneath the perimeter fence. A study published in the California Fish and Wildlife Journal describes how fencing at the facilities was designed to allow kit foxes and smaller animals to pass underneath while restricting larger predators, including coyotes.

The gap measures approximately 12–15 centimetres, small enough to limit access for larger animals. It allows the foxes to move in and out of the fenced areas. That distinction matters because coyotes are among the predators that threaten kit foxes. The fence may therefore do more than mark the boundary of a solar installation: when properly designed, it can help reduce the foxes’ exposure to some dangers.

Can solar farms help protect endangered wildlife?

The findings do not mean solar farms automatically benefit endangered animals. Both California facilities incorporated conservation measures, including suitable vegetation, movement corridors and artificial dens. Researchers at UC Santa Barbara reported that fox survival was not significantly different between the solar sites and nearby reference areas. They also cautioned that conservation measures likely helped limit potential harm.

Other research demonstrates that wildlife responses are location- and species-specific. A 2026 study of desert kit foxes at solar developments in Southern California, published in the Journal of Arid Environments, found that many of the tracked foxes made extensive use of the facilities. However, home-range sizes differed between populations, highlighting the significance of local conditions. Solar farms can also bring risks, including habitat disturbance during construction, roads and exposure to harmful chemicals.

A tiny design choice with big consequences

With the growth of renewable energy, developers must grapple with how to produce low-carbon electricity without harming the ecosystems where projects are located. The San Joaquin kit fox findings suggest that seemingly minor design choices can make a difference. A carefully planned fence, suitable vegetation and ongoing wildlife monitoring may help some animals continue using landscapes transformed by infrastructure. It is clear that clean-energy projects can be designed with wildlife in mind and that planning for animals from the beginning may help reduce the environmental costs of the energy transition.