Wildfire Smoke Darkens Solar Power Output

Wildfires pose a significant threat to solar power generation, as evidenced by the 2023 Canadian wildfire season. Smoke from these fires led to a substantial reduction in solar electricity output across North America and Europe, estimated at 6.38 terawatt-hours over five months. This decline represented about 2.8% of the total solar electricity generated in these regions during that period.

The atmospheric particles from wildfire smoke scatter and absorb sunlight, diminishing the amount that reaches solar panels. Researchers estimated this impact resulted in economic losses of approximately $1.9 billion and was associated with significant CO2 emissions. This effect extends beyond the immediate vicinity of fires, impacting solar farms, commercial installations, and rooftop systems.

Beyond smoke, other air pollutants like those from automobiles and coal-burning generators, as well as dust from construction, can also decrease solar panel efficiency. The U.S. Department of Energy recognizes wildfire damage as a risk to photovoltaic systems, including potential physical damage to panels and components.

While vegetation management and defensible space around solar installations can mitigate physical fire damage, improving solar power forecasting is crucial for grid operators. Advanced forecasting can help anticipate generation declines due to smoke, allowing for alternative energy sources to maintain grid stability. Researchers are developing enhanced machine learning models for more accurate predictions during extreme smoke events.