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xAI Data Center Emits Plumes of Pollution, New Video Shows
(www.desmog.com)
This is a most excellent place for technology news and articles.
Methane is what the majority of natural gas is made up of, and if your generator isn't made to be very efficient (like a real power station is), you'll lose some of your fuel unburnt into the atmosphere.
Kinda like unburnt wood smoke vapour, which could have been burned in a higher quality wood burner, but just goes up the chimney in an open fire.