The EGN Mobile Base Station is a portable structure with enough power-generation mechanisms to sustain itself and defenses to withstand any storm or worm attack.
The base station is the plot's central hub. It's where Explorers can log into a mission dashboard, and where they will soon be able to play the first iteration of missions, minigames.
It does not currently have any upgrades, and as an Architect you can simply purchase one to place it on your plot. In doing so, you unlock missions for Explorers on your plot.