Dust may seem like a minor inconvenience, but for the solar industry, it is a surprisingly expensive problem. Across some of the world's sunniest regions, including parts of India, the American Southwest, and the Sahel in Africa, layers of dust, pollen, and airborne particles can settle on solar panels and quietly eat away at electricity production. Now, engineers and entrepreneurs have turned to the kind of technology that helped dust away from equipment in the cold vacuum of space on the Moon and Mars.
According to a new report from Carnegie Mellon University (CMU), a Pittsburgh-based startup, Clear Solar, has licensed NASA technology called the Electrodynamic Dust Shield (EDS), which employs electric fields to repel dust particles from surfaces without water, brushes, or manpower. The company will begin field testing the technology across multiple pilot sites around the world this summer.
A Costly Problem Hidden in Plain Sight
The industry calls dust build-up soiling, and it seems like an innocent problem, but its consequences can be huge. The International Energy Agency's Photovoltaic Power Systems Programme (IEA-PVPS) report suggests that soiling is one of the leading causes of underperformance of PV systems around the world. It estimates that dust, pollution, and bio-organic matter are reducing solar electricity production by an estimated global average of roughly 4 to 7 percent annually, leading to billions of Euros in lost revenues for the industry. In areas of the world with minimal rainfall, particularly in very dry and dusty areas, the problem becomes more acute. In some conditions, studies have reported energy-output losses exceeding 50 percent in some particularly dusty locations, according to Carnegie Mellon University researchers.
To combat soiling, most large solar farms currently employ water-intensive manual labour and a special type of robots that use brushes. Cleaning and maintenance can represent a significant operating expense for large solar farms, particularly in dusty regions.
The NASA Technology Is Making Its Way into Solar Farms
The cleaning technology causing excitement was not initially created with Earth-based solar farms in mind. NASA developed the technology to protect equipment on the harsh surfaces of the moon and Mars, where dust interferes with sensitive systems. It uses transparent electrodes embedded in a surface to generate oscillating electric fields that move dust particles away. NASA states the technology can be utilised to repel dust from solar panels, camera lenses, thermal radiators, spacesuits, and other sensitive components facing lunar or Martian dust. In March of 2025, the agency announced a successful test of its Electrodynamic Dust Shield on the surface of the Moon in Firefly Aerospace's Blue Ghost Mission 1. The agency reported it successfully removed lunar dust from test surfaces.
Clear Solar reports that the technology can remove roughly 97 percent of accumulated dust under test conditions. When an electrical current is passed through conductive traces embedded in the glass of the panel, the polarity can rapidly be flipped, helping remove dust particles from the surface. According to CMU, it only takes a few seconds to clean and can be performed numerous times per day.
Why Is This Good News for India and Dusty Locations Globally?
The applications are far beyond the United States. India is pushing to become one of the biggest solar electricity producers in the world, but it faces serious issues from dust buildup, water shortages, and operating costs. In many arid regions, including parts of India, solar operators must balance the need for regular cleaning with local water constraints. With the new water-free method, both operating costs and labour costs can be lowered, helping solar farms generate clean electricity more efficiently. Engineers are not only focusing on this electric cleaning method. CMU's engineering researchers are also studying wind patterns around dust and how the structure of solar panels can be made to capture natural winds to help reduce dust buildup for longer.
The Future of Solar Electricity Generation
As the solar industry matures, we will see more attention placed not just on building more solar arrays but on maintaining the ones we have. Soiling is one of the biggest issues for PV power generation worldwide, according to IEA-PVPS reports, and researchers and the industry look forward to more effective methods of cleaning to help improve both the economics and sustainability of PV projects. If the technology proves effective at scale, it could improve energy output while reducing water use and operating costs. The use of electric fields could become a useful new maintenance tool for the solar industry.
