[estimator7292]

It's also completely wrong. Doc Brown's time machine did not require 1.21 gigawatts.

Very explicitly, it's 1.21 jigawatts. Completely different unit. What's a jigawatt? It's a movie, neither jigawatts nor flux capacitors are real things.

[kmoser]

It could be gigawatts, if Doc Brown also pronounces "GIF" as "jif".

[whynotmaybe]

And in the French dubbed version, it's 2.21 gigowatt