Regional distinctions

The scientists keep in mind that aerosol container likewise add to cloud development, which likewise triggers additional losses. The degree of that contribution is much more difficult to approximate, so the scientists focus on aerosols for much of the analysis. A few of those aerosols happen naturally, usually from dust kicked up by winds in desert areas. Regardless of deserts’ track record as bright paradises, the world as a whole hasn’t constructed much solar facilities in the desert yet, so this isn’t as much of an aspect as you may anticipate.

Coal seems a significant factor. It’s approximated that sulfur dioxide aerosols, mainly produced through coal burning, represent almost half of the aerosols evaluated here. Carbon-rich product, which likewise normally originates from nonrenewable fuel sources, represent another 18 percent.

The effect of aerosols, nevertheless, is not uniformly dispersed. In China, the scientists approximated that aerosols were decreasing solar production by 7.7 percent total and balancing out anywhere from a 3rd to half of its yearly development. The scientists keep in mind that “the spatial circulation of photovoltaic losses in China mirrors that of its coal-fired power capability,” and an analysis of contamination information from China reveals that 30 percent of the losses due to aerosol be credited to coal burning.

On the other hand, many solar production in the United States occurs in the south and west, while coal plants are more typical in the east and northeast. As an outcome, the yearly losses in the United States were less than half of those seen in China (3 percent).

Fortunately is that things are improving in China. In reaction to some extreme contamination issues, the nation developed a brand-new generation of high-efficiency coal plants and retired a few of the worst polluters. And the information reveal that this is likewise benefiting solar energy, with the effect of aerosols dropping over the last couple of years.

Even with the enhancements, it’s striking that coal seems the only source of power that actively decreases the performance of what’s forming up to be its main rival. It needs to likewise supply an incentive to move off coal faster, as a minimum of a few of the loss of coal production will be balanced out by boosted efficiency from solar.

Nature Sustainability, 2026. DOI: 10.1038/ s41893-026-01836-5