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1.21 Gigawatts?

you mean 1.21 Jig-a-watts.

On a more serious note, while the TNG technical manual doesn't give exact numbers for deflection of quantum torpedoes, it does state that the Enterprise-D's shields, during alert status, would operate with a continuous output of 2688 Megawatts, with individual generators able to reach a peak momentary load of 473 Gigawatts for 170 miliseconds.

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