There are 7 Facilities in Dying Light 2. Finding and assigning all Facilities unlocks the "Municipal Services" achievement / trophy.
There are two types of Facilities present in the City - Water Towers & Electrical Stations. After activating a facility, you will be able to assign it to one of the Factions and change the City Alignment.
To activate the Electrical Station, you need to repair broken connections between its generators. First, find a working generator [green light] and connect it to one of the broken ones [red light].
