Twelfth power was the measurement of power given by passive sensor scans on the USS Enterprise, regarding the output of the V'ger energy cloud when scanned by Spock.

According to Commander Will Decker, "thousands of starships couldn't generate that much..." Spock further elaborated that V'ger was "generating a force field greater than the radiation of Earth's sun." (Star Trek: The Motion Picture)

For comparison, Earth's sun radiates 384.6 yottawatts or 384.6x1026 joules per second.
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