Satellite images show that Zayzoon Power Plant, which was bombed by the regime in 2015, has been all but wiped out (most probably sold for scrap metal). It's been under HTS's control for many years.

It had a nameplate capacity of ~500 MW (6% of Syria's total capacity).

More on Syria's electricity sector in my study with Dr. Sinan Hatahet for the European University Institute last year.