Zarya's passive is Energy, which allows Zarya to gain more damage on her Particle Cannon, the Plasma Bomb, and her Ult as she absorbs damage on her shields.
Visually, the orb on her weapon becomes larger and glows brighter. But nowhere in-game, or on the wiki does it state how the damage scales as she "stores" more damage.
Up to how much damage can Zarya dish out in addition to the base damage as she absorbs damage?