FAQ:
Does the damp power psionic power (Complete Psionic,
page 82) trump an effect that empowers or maximizes a
spell or power?
Yes and no. An empowered fireball affected by damp
power would deal 1 point of damage per die, plus 50%. A 6thlevel
sorcerer’s empowered fireball would thus deal 9 points of
damage. A maximized fireball, however, no longer has
variable, numeric effects (because they’ve been maximized), so
damp power would have no effect on its damage.