Doors - Open the first door out of spawn room. Now go the left and walk up the stairs to the second floor and buy the door next to the wall-buy. Go down into the wrecked area where its a little flooded and open the door to the stairs up. You walk up and open the debris in the opening in the wall. Go up the stairs to the big building with columns and the power switch will be just to the right of the stairs inside of the building.