3x12 alien power cells. One can be found on each of the following: the stove, the table next to the stove and the table with the glowing plasma ball in the room at the bottom of the pit where the Tesla Coil is found.
2x9 alien power cells can be found in the room past the Tesla coil (upstairs). (In two ammo boxes above the Mark IV turrets.)
The hallway can be noted by the many servers along the walls and the two mark VI turrets at the end. At the very end of this hall, on both the left and right of the turrets, there are tiny alien spaceship playground models with arrows on the side of their stands pointing upward. Look above each of these to find two ammunition boxes on shelves, they contain the alien power cells. There are considerably more alien power cells (around 45) with the Scrounger perk, so having this perk is recommended to reap the largest amount of this rare ammunition.
The door that requires a key and has a nearby locked terminal (requires a Scienceskill of 100) is merely part of a shortcut through the building. It does not contain any loot.
There are 36 Metro tickets stacked in a pyramid with an eight ball on top located in the lower right portion of the map.
In the bottom center of the map, past a corridor, a garden gnome and a teddy bear have been posed playing chess with milk bottles and beers as chess pieces. The gnome has a cigarette in its mouth, and a micro-sized "smoke" graphic is placed at the end.
A second smoking gnome can be found in the room with the fail-safe computer.
A series of hard-difficulty terminals can be used to disable the sentry bots found throughout the building and also to vent radiation from a contaminated corridor.
Strangely, after using the aforementioned terminals to turn a pair of turrets non-hostile, your followers may consider them still to be hostile and attack them.
The emergency exit ladder near the Tesla Coil leads to a manhole just north of Old Olney and northeast of Vault 92. Examining the outside of the manhole before having exited through it will show "Requires Key", but it will become automatically unlocked once the player exits from the Olney Powerworks side of it.
pc If you destroy the sentry bots before shutting them down with the terminals, then use the terminal to shut them down (after them already being disabled), they'll have the "Talk" option instead of the "Search" option. Shooting them once or striking them with any weapon will give you XP as if you killed them again. [verified]