In Belgium, the operators of the electricity grid, known as grid operators, are responsible for the transport and distribution of electricity. The main network operators in Belgium are:

1. Elia: Elia is the transmission system operator (TSO) for high voltage in Belgium. They are responsible for the transport of electricity over long distances and for connections to the electricity grids of neighboring countries.
2. Fluvius: Fluvius is a distribution network operator (DSO) active in the Flemish part of Belgium. They are responsible for managing the electric and natural gas distribution networks, as well as public lighting and cable television.
3. ORES: Active in Wallonia, ORES is another important distribution system operator that ensures the distribution of electricity and natural gas.
4. Sibelga: Sibelga is the grid operator for the city of Brussels. They are responsible for managing the distribution of electricity and natural gas within the Brussels Capital Region.
5. RESA: Active in the Liege area, RESA is another distribution system operator in Wallonia, involved in the distribution of electricity and natural gas.