Power is energy per time, and our measurements of fulgurites suggest that megajoules of energy make rock in thousandths to millionths of seconds. So a gigawatt is actually on the low side – lightning power may be a thousand times that, reaching into the terawatts, though the average is probably tens of gigawatts.
That’s enough energy to power about a billion houses, albeit only for a few millionths of a second.
https://www.sciencealert.com/scientists-are-using-fossils-to-work-out-how-much-energy-is-in-a-lightning-strikes?limitstart=1
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