Not that it's a big deal, but every house we've previously looked at in Horry County is serviced by Horry Electric and according to Horry Electric's site: Horry Electric Cooperative, Inc., primarily serves on the western side of the Intracoastal Waterway. And their map on the link below shows their service area. I also found this quote in another site: "A general rule of thumb is that Santee Cooper operates within the Myrtle Beach city limits and Horry Electric serves the county and other municipalities."
But, I admit, my experience is limited.
Our service area