Maintenance of electricity quality

In order to maintain electricity quality, the following technical and organisational tools are employed:

  • maintenance of the summary power reserve for the provision of primary frequency control;
  • secondary load/frequency control;
  • secondary voltage control;
  • tertiary voltage control;
  • retaining the sinusoidal shape of the voltage waveform and
  • ensuring transmission stability;


The criteria for electricity quality assessment are based on current technical standards.