HOPS carries out the energy activity of transmission of electricity produced in Croatia or imported from other countries, for Croatian customers or customers in other countries, and transit of electricity through the Croatian transmission network.
A precondition for the successful carrying out of the transmission activity is efficient operation of the Croatian power system as a whole (electricity production, transmission, distribution and consumption in the Republic of Croatia) and coordination of the operation of the Croatian system with neighboring systems and UCTE. The main control center of the Croatian power system is the National Dispatch Center (NDC) in Zagreb.
HOPS carries out the coordination between electricity consumption and production planning; coordination among import, export and other forms of electricity exchange ; dispatches production and transmission of electricity and coordinates electricity supply to customers; it has the authority and responsibility for the switching status of the 400 and 220 kV transmission network elements, and for the 110 kV network of system importance.
HOPS ensures and provides system services and ancillary services, prepares reports and archives data on system operation, and analyzes the performance of the Croatian power system. HOPS is independent from the energy activities of electricity production and supply.
The system operation function is carried out in accordance with primary and secondary legislation of the Republic of Croatia and with ENTSO-E Operation Handbook.