Step One: Go back to Tenpenny Tower and either pickpocket Gustavo (The hard route) or make Herbert Dashwood (The easy route) give you the key to the generator room.
Step Two: Head outside, make a right of the front doors (While staying inside the Tenpenny courtyard) and go to the rear of the tower.
Step Three: Either destroy the generator or hack the I THINK Average locked computer, then Roy will tell you to meet him outfront.
Step Four: Reap your rewards.