Last week, Tesla filed a permit for what will be the world's largest Supercharger, at Harris Ranch in Coalinga (24553 W Dorris Ave). According to my sources, at least 80 V3 Superchargers will be installed (in addition to the 18 existing stalls) in a new paved parking lot in the truckers rest area, behind the Shell station and Tesla's battery swap area. In a similar setup to Firebaugh, there will be a solar canopy over most or all of the stalls, as well as a battery storage system.
Tesla may also be adding extra stalls to the 24505 W Dorris Ave Supercharger, according to a separate permit filed at the beginning of March. Also, based on what was said about Patterson possibly getting Semichargers, it leads me to believe Harris Ranch may get some as well, especially since the new Supercharger will be built in the truck lot, though I don't have anything else to back that up.
The permit is currently in pending review status since it was just filed. The expansion (marked as Coalinga, CA) is due to open in Q3 per Find Us.