Coal burning releases aerosols into the atmosphere that reduce solar power generation worldwide. Researchers quantified this previously unmeasured loss of renewable energy output, finding that particulate pollution blocks enough sunlight to undercut solar capacity by a measurable margin annually.
The study examined how airborne particles from coal combustion scatter and absorb sunlight before it reaches solar panels. These aerosols form a haze that dims irradiance at ground level, directly reducing the electrical output of photovoltaic systems. The effect varies by geography. Regions downwind of heavy coal use, particularly in South Asia and China, experience the largest losses.
Previous research focused on how coal pollution damages health and climate, but this work isolates its direct impact on renewable energy infrastructure. The findings reveal a self-reinforcing problem: coal plants undermine the solar capacity needed to replace them. The aerosol effect essentially creates an invisible tax on clean energy deployment.
Quantifying these losses matters for energy planning. Grid operators and utilities must account for actual solar production, not theoretical maximum output under clear skies. In polluted regions, the practical capacity factor of solar installations drops below models that ignore atmospheric conditions.
The research also highlights an economic argument for faster coal phase-out. Every year coal plants operate, they suppress solar performance in nearby areas, making renewables appear less efficient than they actually are under clean-sky conditions. Removing coal sources would improve solar output immediately, even without building new panels.
The study used satellite data and ground measurements to map aerosol concentrations and their correlation with solar irradiance. The methodology allows comparison across regions with varying pollution levels and solar deployment density.
This data enters an ongoing policy debate about coal phase-out timelines. Policymakers often weigh the costs of switching to renewables against perceived reliability and economics. The hidden drag on solar performance from existing coal infrastructure strengthens the case for faster transitions