POW-R is a maintenance ampbot aboard the Axiom. POW-R units are used again battery failures and power outages. One was in a gangway. Another POW-R is seen in the Repair Ward near VN-GO and the place where a CARSTIC robot arm places WALL•E.
He is seen again later with PR-T, the small cart robot, L-T and some other robots when EVE and WALL•E were taking the plant to the Axiom's holo detector.
Trivia
His name is a pun on the word "power".