I have a certain level of expertise on this. I led a National Geographic expedition to go down inside it back in 2013. (Long story, but super-amazing expedition)
The amount of heat produced is not worth harnessing directly, it would not be profitable to build a generating station there. However, the government does have plans to tap into the existing reservoir of natural gas beneath the crater. For years they’ve been talking about extinguishing the fire and extracting the gas, but it has not happened yet. In the meantime, the “Doorway To Hell” has become Turkmenistan’s #1 tourist attraction.
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