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Wildfire in Photovoltaic Park: 150 hectares burned, role of wind and heat

A fire ravaged 150 hectares of a photovoltaic park in the Landes, mobilizing 250 firefighters and half of the national aerial fleet. Strong winds and an exceptional heat wave accelerated the spread, highlighting the risks of fires linked to extreme climate conditions.

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Rédaction Weather IA

mercredi 16 septembre 2026 à 20:215 min
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Wildfire in Photovoltaic Park: 150 hectares burned, role of wind and heat

In less than twelve hours, a blaze consumed 150 hectares of a large photovoltaic park installed at the heart of the Landes, triggering one of the largest rescue mobilizations of the season. The prefecture indicated that up to 250 firefighters were engaged on the ground, supported by 14 aerial means - including four Canadair and four Dash - half of the national fleet available. The fire, deemed very unfavorable from the early hours, quickly exceeded the capacities of classic containment, pushing the authorities to activate emergency protocols rarely used outside major forest fires.

Fire in Photovoltaic Park: 150 hectares consumed in less than 12 hours

The point of origin of the fire remains unconfirmed to this day, but the first investigations suggest a triggering linked to an electrical fault within the park, amplified by the dry vegetation that bordered the rows of panels. As soon as the alert was raised, the ground teams had to face a rugged topography, where hills and valleys channel air currents, creating pockets of heat that feed combustion. The firefighters first tried to isolate the epicenter with water lines, but the rapid spread required the use of water and retardant drops from aircraft, a tactic usually reserved for large fires.

Satellite data from Copernicus, analyzed in real time, allowed the evolution of the fire to be mapped with a resolution of 10 meters, offering commanders quasi-instantaneous visibility on the most active zones. This cartography was coupled with a predictive model based on a neural network, trained on thousands of similar incidents, to anticipate probable fire front trajectories. According to this model, the combination of south-west wind at 30 km/h and temperatures above 32°C created a high uncertainty zone for forecasting, making each operational decision critical.

Meteorological mechanisms that fueled the fire

The meteorological context of the weekend of September 15 was characterized by an exceptional heat wave for the season, with maximum temperatures reaching 34°C in the region, according to Météo-France. The heat index, which combines temperature and humidity, exceeded 45, a level rarely observed in autumn. This intense heat dried the upper layer of the soil, reducing relative humidity to less than 20% in the forest areas adjacent to the park. A low humidity rate, combined with sustained winds, constitutes the ideal cocktail for rapid fire spread.

Models from ECMWF, integrated into the Copernicus platform, signaled as early as the previous Tuesday a high risk of fire, with notable forecasting uncertainty due to the variability of air flows along the Atlantic coast.

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