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Yep, it's JIGOWATT, not gigawatt.

In the film's script the word "gigawatt" is spelled "jigowatt".
Bob Gale and Robert Zemeckis had been to a science seminar and the speaker had pronounced it "jigowatt".
Source: http://www.imdb.com/title/tt0088763/trivia also see http://en.wikipedia.org/wiki/Back_to_the_Future

and this forum discussion, if you're still in doubt!