Internet or Insertonet?
Looking around it seems that most power systems connected to the Internet have had malware inserted. SolarWinds was just a small demonstration that if you are connected to the Internet then you are vulnerable. It's no surprise, the Internet was designed to always work, security was not a priority when it was designed so hackers can keep hacking. Using the Internet is a bit like skiing downhill after a nice snowy day, most of the time it's great but occasionally you get buried.