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I'm assuming the parent is making a 1.21 Gigawatts joke, a reference to Back to the Future.

That’s be to run the Time Machine. This is optional.

It’s jiggowatts!

If we’re being pedantic about this uncommon pronunciation of gigawatt, it’s jigowatt.

An acquaintance of mine pronounces it with a soft G and long I, jai-ga-watts.

I don’t think it’s an uncommon pronunciation. It’s a fake unit.