The short RR in singles (long RR in verts) is revenue side. Structurally there is edge (less drift) in the short RR in verts but there is a trigger.
Installed a 22KW Generac when my house was built 8 years ago. Elec panel was split with essential things (fridges, kitchen, room lights, well pump, etc) on the gen panel. Would have had to get much larger genny to run the whole house. It runs off of a 1000 gal buried propane tank and auto switches and starts after 20 sec line pwr loss. Been working fine and maint is just change oil every year.
The entire area is out. They are de-energizing due to wind advisory. Power isn’t the issue as much as broadband. I have a PowerWall.