You are fuelled by your hate for progress.
Overcharge a generator by performing the Damage Generator action. The next Survivor interacting with that generator is faced with a difficult Skill Check. Failing the Skill Check results in an additional 2/3/4% loss of progress.
Succeeding the Skill Check grants no progress but prevents the generator explosion.
After Overcharge is applied to a generator, its regression speed increases from 85% of normal to 130% of normal over the next 30 seconds.