In 2019, US wildlife officials warned that desert solar farms can look like lakes from the sky, luring waterbirds to land where they cannot take off
TIMESOFINDIA.COM | Aug 18, 2026, 07.45 PM IST
From the ground, a solar farm in the desert looks like rows of dark panels spread across a wide, dry landscape. From high above, however, those same panels can create a very different impression. Their reflective surfaces can resemble open water, potentially attracting waterbirds that mistake the installation for a lake. Once they land, some birds may struggle to take off again from the hard surface. The concern was highlighted in a 2019 case study titled Wildlife-Friendly Solar Energy in the Mojave Desert, published by the US Fish and Wildlife Service through its Conservation and Adaptation Resources Toolbox, that examined how solar development could be designed around sensitive desert habitat.
The project focused on a solar facility near Pahrump, Nevada, where researchers were looking at ways to reduce the impact of development on desert tortoises. The location presented a difficult balancing act. Solar energy required a large footprint, while the surrounding desert was habitat for a species protected under US law. Rather than simply clearing the site, researchers tested whether the facility could be designed and managed in ways that allowed tortoises to continue using parts of the landscape.
One of the changes involved the arrangement of the solar panels. Instead of placing the rows close together, the project used wider spacing of about 20 feet. The wider gaps were intended to break up the lake-like sheen visible from above and reduce the chance that birds would mistake the installation for a body of water. The approach addressed a specific visual problem associated with large expanses of reflective panels, but the study did not establish that wider spacing eliminated waterbird attraction or mortality.
What happened to the desert tortoises
The project also required researchers to deal with desert tortoises already living in the area. Resident tortoises were moved from the development footprint into suitable nearby habitat before construction. Biologists later tracked some of the relocated animals to see how they behaved after release. Four tortoises were fitted with radio transmitters, allowing researchers to follow their movements and determine how they used the new surroundings.
The monitoring provided a closer look at how relocated tortoises responded to the change in habitat, but the results came from a relatively small pilot. A full-scale solar development could affect far more animals. The study therefore cautioned that lessons from the Pahrump project would need additional testing before being applied to much larger facilities where hundreds of tortoises could potentially be involved.
That distinction matters because the tortoise work and the bird issue were not the same research question. The radio tracking helped researchers understand the movements of relocated tortoises, while the question of whether reflective solar panels attract waterbirds required a different kind of monitoring. The study identified bird attraction and mortality at existing solar facilities as an area requiring further investigation.
A design problem that is difficult to see from the ground
The bird concern comes from an optical effect that is easy to miss when looking at a solar farm from the ground. A large field of panels can reflect the sky and appear to resemble a lake when viewed from above. Waterbirds flying over an otherwise dry desert landscape may be drawn towards that apparent water source and land on the panels.
The consequences can be serious. A bird that lands on a solar panel may find that the smooth, angled surface offers no easy way to launch itself again. The risk is particularly important in desert regions, where artificial features can stand out sharply against an otherwise dry landscape.
The Pahrump project therefore offered two related but separate lessons. Its wider panel arrangement was intended to reduce the visual effect that could attract birds, while the tortoise work tested ways of allowing a solar facility to coexist with wildlife habitat. Neither part of the pilot provided a complete answer to the wider environmental questions raised by large-scale solar development.
The project also showed why the effects of renewable energy infrastructure cannot always be judged from the ground. A solar farm may appear carefully designed when viewed by a person standing beside it, yet look completely different to an animal flying overhead. The Pahrump experience suggested that panel layout and wildlife management could be considered together, while also making clear that more monitoring was needed to determine how well such measures worked at larger facilities.
For desert solar development, that may be one of the most important lessons. Reducing the environmental footprint of a project is not simply about where panels are placed on the ground. It can also depend on how the entire installation looks and functions to wildlife moving through the landscape above it.
The project focused on a solar facility near Pahrump, Nevada, where researchers were looking at ways to reduce the impact of development on desert tortoises. The location presented a difficult balancing act. Solar energy required a large footprint, while the surrounding desert was habitat for a species protected under US law. Rather than simply clearing the site, researchers tested whether the facility could be designed and managed in ways that allowed tortoises to continue using parts of the landscape.
One of the changes involved the arrangement of the solar panels. Instead of placing the rows close together, the project used wider spacing of about 20 feet. The wider gaps were intended to break up the lake-like sheen visible from above and reduce the chance that birds would mistake the installation for a body of water. The approach addressed a specific visual problem associated with large expanses of reflective panels, but the study did not establish that wider spacing eliminated waterbird attraction or mortality.
What happened to the desert tortoises
The project also required researchers to deal with desert tortoises already living in the area. Resident tortoises were moved from the development footprint into suitable nearby habitat before construction. Biologists later tracked some of the relocated animals to see how they behaved after release. Four tortoises were fitted with radio transmitters, allowing researchers to follow their movements and determine how they used the new surroundings.
The monitoring provided a closer look at how relocated tortoises responded to the change in habitat, but the results came from a relatively small pilot. A full-scale solar development could affect far more animals. The study therefore cautioned that lessons from the Pahrump project would need additional testing before being applied to much larger facilities where hundreds of tortoises could potentially be involved.
That distinction matters because the tortoise work and the bird issue were not the same research question. The radio tracking helped researchers understand the movements of relocated tortoises, while the question of whether reflective solar panels attract waterbirds required a different kind of monitoring. The study identified bird attraction and mortality at existing solar facilities as an area requiring further investigation.
The bird concern comes from an optical effect that is easy to miss when looking at a solar farm from the ground. A large field of panels can reflect the sky and appear to resemble a lake when viewed from above. Waterbirds flying over an otherwise dry desert landscape may be drawn towards that apparent water source and land on the panels.
The consequences can be serious. A bird that lands on a solar panel may find that the smooth, angled surface offers no easy way to launch itself again. The risk is particularly important in desert regions, where artificial features can stand out sharply against an otherwise dry landscape.
The Pahrump project therefore offered two related but separate lessons. Its wider panel arrangement was intended to reduce the visual effect that could attract birds, while the tortoise work tested ways of allowing a solar facility to coexist with wildlife habitat. Neither part of the pilot provided a complete answer to the wider environmental questions raised by large-scale solar development.
The project also showed why the effects of renewable energy infrastructure cannot always be judged from the ground. A solar farm may appear carefully designed when viewed by a person standing beside it, yet look completely different to an animal flying overhead. The Pahrump experience suggested that panel layout and wildlife management could be considered together, while also making clear that more monitoring was needed to determine how well such measures worked at larger facilities.
For desert solar development, that may be one of the most important lessons. Reducing the environmental footprint of a project is not simply about where panels are placed on the ground. It can also depend on how the entire installation looks and functions to wildlife moving through the landscape above it.