Island operation capability

Island operation capability (IO) is the capability of a generating unit to supply an isolated part of the system, a co-called island. Such a generating unit must have a high regulation capability which is required to prevent and, if necessary, manage a state of emergency. Since the unit supplies an isolated part of the system, significant fluctuations of frequency and voltage occur.

The generating unit must meet the following requirements:

  • switch to island operation; 
  • island operation; 
  • re-connection of the island to the system; 
  • service availability.