I can confirm that the Motorola control channels for the systems in Greenville, Spartanburg and Polk are still active. But I scanned the Spartanburg system quite a bit today and didn't hear a peep on it.
I can also confirm what sounds to me like Opensky control data channels on numerous frequencies in the area. These are new in the last month or so, I'd say. Frequencies with this sound include 858.3375, which has long been the Duke MDT (rdlap) channel in Spartanburg, as well as 854.9625, a voice channel for the local Duke Motorola TRS in Spartanburg.
Opensky was mentioned in a thread in the NC forum back in the Spring as the type of system Duke was implementing. If that is indeed the type of system being implemented, no scanner (digital or otherwise) can scan it or decode its audio.
I can also confirm that radios inside several Duke Energy vehicles I have seen recently have the Harris brand name displayed on them.
I'd say the days of monitoring Duke Energy in SC are quickly ending if they aren't over already.