So we're clear, Santee Cooper and Santee Electric are two very different things.
But they likely to share a radio system, in this case, the one called SC Public Service Authority.
SC Public Service Authority Trunking System, Various, South Carolina - Scanner Frequencies I have never monitored Santee Electric specifically, so I can't guarantee they still use this system, or that the talkgroups shown are accurate. But there's a good chance this information is correct.
There's also no guarantee that the site close to you carries the Santee Electric talkgroups, but again, there's a good chance that it does if the site is in their service area.
AB4BF is exactly correct - the system is exactly like Palmetto 800 in terms of programming. Select your site and talkgroup group to add to your favorites list. AB4BF offers good advice - scan in ID Search mode to ensure that talkgroups other than those listed in the database aren't in use.