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 difficult) containing random loot. The terminal close to the safe is also rated very difficult 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.

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).

OR, to get the first tape, you could go to Arefu, jump off the bridge (over the water) and go directly southwest, and you should see powerlines almost right after you climb out of the water. If you look at them, you should see the boarded up one. Just go there and you'll find the first tape in there.