The minute reserve available within 5 minutes is provided by those generating units connected to the Czech power system which are capable of providing the contracted regulation reserve RZMZt within 5 minutes of a command from the ČEPS Control Centre. The minute reserve refers to a required change in generating unit power output, positive or negative, as measured at unit terminals.
The positive minute reserve RZMZt+ can be provided e.g. in the form of an increase in unit power output, discontinuation of pumping (at pump storage hydro power plants), non-utilisation of pre-planned pumping or disconnection of the relevant load from the Czech power system.
The minimum value of RZMZt for t=5 minutes provided by one unit is 30MW (unless otherwise contracted with the TSO). The minimum unit power output is determined by ČEPS. The minimum guaranteed duration of the provision of the minute reserve available within 5 minutes (RZMZ5) is 4 hours even if this service is activated at the end of its reservation interval.
Conditions for this ancillary service provision are specified in the Agreement with Ans Providers.