The JCP&L P25 system is not really that active compared to the PSE&G one, so the amount of radio traffic heard is greatly diminished as compared to other utilities.
With that said, I would highly recommend a Uniden SDS 100 or the SDS 200 (if you want the base model). While JCP&L is currently running in P25 Phase 1 digital mode, with my experience, the older model P25 Phase 1 type scanners have had a tough time tracking the system correctly. Also, the coverage on the JCP&L system is tricky in some areas to receive, even with a high gain Remtronix 700/800/900 MHz antenna. On top of this, it does depend on exactly where you’re going to be monitoring from, so you may be in a spot where the tower is close by. And once you do get on board with JCP&L, they have a number of other talkgroups (channels) that the database will need assistance with identifying.