Generating unit certificates for individual AnS categories are issued by the following independent certification authorities recognised by ČEPS (in alphabetical order):
For ancillary services concerning active power (primary and secondary):
For ancillary services concerning secondary voltage and reactive power control:
For ancillary services concerning "Island operation":
For ancillary services concerning “Black start”:
Authorisation for secondary control concerning active power allows certification to be issued for spinning reserve at hydro power stations, tertiary power control, operating reserve, quick-start reserve available within 10 minutes and load shedding.