VAPL-58 Power Station

The VAPL-58 Power Station is a set of fenced-in power lines and transformers next to a Power Substation, located South-South-West of Arefu, west of Vault 106.

Loot
There are incidental items potentially useful at a Workbench, a safe (rated very hard) containing random loot. The terminal close to the safe is also rated very hard and unlocks the safe.

A Stealth Boy is in the back on the control panels of the station.

The substation also contains a first aid box and a copy of Dean's Electronics by the safe. A second first aid box in by the workbench and is easy to miss.

On the light just below the roof in the middle of the room is a Mini Nuke, jump to take it.

The ladder on the east wall inside the station leads to the roof and a BB gun, BB ammunition, and a copy of U.S. Army: 30 Handy Flamethrower Recipes.

The 1st Keller Family Transcript is to the north of the Power Station three towers away in a boarded up one, there is also a locked foot locker (very hard) and a Mini Nuke.

If you go in no-clipping mode you can see a dead mercenary under the carpet(you can only see a blood patch from above). He has only a mercenary outfit you can loot.

The shelter to the Southeast of the Power Station contains a Nuka Cola Quantum hidden in the grass.

Just a short walk South of the station (on the map: one-and-a-half grids due East of Fort Bannister) is a large radiated crater with an overturned military truck with lots of Alien Power Cells. In a small Merc camp on the North edge of the crater are a locked personal footlocker and a safe (both rated easy), both with random loot. (There are many small radiated craters in the area, one with an overturned truck in water, but this is in a very large, dry crater.) There is also a small Enclave camp between the crater and the Merc camp, according to the terminal you find here, they are studying the crater (and maybe searching for alien technologies).