This fenced-off power station has one shack containing some junk items. It is populated with several Scorched. Two copper veins can be found next to the station. There is also a power box here that requires activating the Poseidon Energy Plant WV-06.
Potential workshop plan - On a cabinet in the substation shack.
The Poseidon power substation PX-01 appears only in Fallout 76.