What does “sixth-generation fire” mean in energy terms?

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"Sixth-generation fire" signifies extreme energy release, exceeding suppression capabilities.

The term "sixth-generation fire" refers to forest fires that release an enormous amount of energy, measured at their fronts. Specifically, when fires release more than 10 megawatts per metre, they enter a category where direct suppression efforts become impossible. Recent years have seen recorded instances of such fires releasing between 20 and 60 megawatts per metre at their fronts, indicating an unprecedented level of intensity.
Uncontrollable Energy Release Threshold

A critical characteristic defining a "sixth-generation fire" is the energy output at its front. Domingos Xavier Viegas, a leading Portuguese wildfire specialist, explained that fires releasing over 10 megawatts per metre exceed the capacity for direct suppression. This energy threshold signifies a level of intensity that renders conventional firefighting tactics ineffective.
Documented High Energy Outputs

In recent years, the phenomenon of extreme energy release has been increasingly observed. Records indicate that fire fronts have been documented releasing substantial energy levels, ranging from 20 megawatts per metre to as high as 60 megawatts per metre. These figures highlight a significant escalation in fire intensity compared to less extreme categories.
Impact on Fire Behaviour and Control

The immense energy released by these fires fundamentally alters their behaviour. At such high intensities, these fires can generate their own wind even in the absence of pre-existing atmospheric conditions, making their progression highly unpredictable and extremely difficult to control. This self-generated wind exacerbates the challenge for both ground crews and aerial firefighting resources.
Limitations of Direct Attack Strategies

When fires reach the "sixth-generation" intensity, direct intervention at the fire front becomes unfeasible, even with substantial aerial support. The extreme heat and rapid spread mean that attempts to attack the fire directly are overwhelmed. Consequently, strategies must shift to indirect methods, such as working on the fire's tail and flanks, or creating firebreaks using heavy machinery like bulldozers, if conditions permit.

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What does “sixth-generation fire” mean in energy terms?

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