Look for the 4 black seats across from C19 (between the women's washroom and Gate C20). There are 2 AC outlets and 2 USB charging ports between each seat.
Don't wait at the gate. Go across the way to the food court and wait at the Jazz Bar. Much better and they will charge your phone for you.
Great tip Ethan
Worst gate in C concourse. Don't get trapped in the seats by the windows...takes forever to get out. Stay by the main terminal walkway if you can.
There is a plug in the floor near the planter right outside the gate area.
Departure board hidden behind the foreign currency exchange car
Not a lot of seating at this gate, but lots in the food court on the other side of the aisle.
There's a plug under the drinking fountain on the right side. I'm charging my phone here now.