I don't think anything in game will tell you, other than maybe the description of the power.
The prima Strategy guide (though otherwise useless except for maps) actually has this in there.
For high elves the permanent powers are:
Elven Reflexes
Gilding of Felwithe
Estoric Studies
Tenet of Takish'hiz
Graceful Movements
Apperception
Gift of Tunare
Streght of the Koada'Dal
Activatables:
Harmonious Mind
Firiona's Zeal
Now, as a note, i hardly think that the +5% power regen is useless
Pow regen +5% for 3mins is really helpful if say your a scout and you burn through your Power quickly, it can help you take on a group of mobs.