[fruser1]

Zone map available here (21 different utilities):

https://www.pjm.com/library/~/media/about-pjm/pjm-zones.ashx

[EEGator]

Thanks. I’ve done work on quite a few of them.
Exelon is ComEd, PECO, Delmarva, Atlantic City Electric, BGE, and PepCo.
South of the highlighted area, Duke is huge.