Nacelle fire at onshore wind site ignites rangeland wildfire
2019Published 1 May 2026Responsible editor: Chief Editor
- Where
- Onshore wind site in arid rangeland area of the United States
- What
- Nacelle fire produced burning debris that ignited a wildfire
- Cause
- Not reported
- Outcome
- Wildfire burned over 250 acres before containment; operator shut down more than thirty turbines
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What happened
In July 2019, a fire in the nacelle of a turbine at an onshore wind site in an arid rangeland area of the United States produced burning debris that fell to ground level and ignited a wildfire. Reporting cited by the source states the wildfire burned in excess of 250 acres of rangeland and threatened a number of structures before being contained by a large multi-agency firefighting response drawing on mutual aid.
Ground-based crews had no realistic means of reaching the burning nacelle at height, so suppression effort was directed at containing the wildfire perimeter rather than the source, which was allowed to burn out. The operator shut down more than thirty surrounding turbines as a precaution and to allow fire crews safe access. The source cites the event as one of several comparable cases in which a turbine fire in dry terrain propagated to surrounding land, and refers to published analysis suggesting that fires make up a significant minority of reported wind turbine incidents worldwide and that reporting of such fires is incomplete.
Contributing factors
The specific root cause of the nacelle fire was not disclosed in the cited public source, which attributed the event in general terms to mechanisms typical of turbine nacelle fires. As general background, the source describes the nacelle as concentrating combustible material (composite housing and blade material, lubricating and hydraulic oils, generator insulation and control cabinet wiring), an abundant air supply driven by the wind, and common ignition sources including electrical faults in transformer or switchgear equipment, overheating of gearbox or generator bearings, and lightning. The propagation pathway described is burning material falling or being blown from height into cured grass and brush at ground level. The eventual extent of the wildfire was reported to have been governed by wind conditions, fuel load and the time taken for fire services to assemble across several agencies.
Lessons learned
- A nacelle fire on an onshore turbine in dry terrain can drop burning debris that starts a wildfire, so operators should map wind directions and fuel loads around each turbine with local fire services.
- Ground crews cannot reach a nacelle fire at height, so emergency plans must direct effort to the wildfire perimeter while the nacelle burns out.
- Turbine fires in arid areas can spread to hundreds of acres, so operators should pre-agree shutdown protocols for neighbouring turbines to give fire crews safe access.
More lessons on weather and external hazards, fire suppression and firefighting, from every incident on the register.
Not yet known
- Specific root cause of the nacelle fire
- Turbine model and age
- Downtime and repair cost
This entry is updated when these are reported. Get an alert for the next one like it.
Source
Published 2026-05-01. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.
