Elia is a Belgian transmission system operator for high-voltage electricity (30,000–380,000 volts), located in Brussels, Belgium.

The company transmits electricity from generators to distribution system operators, which then supply SMEs and homes.

Elia's main activities include managing grid infrastructure (maintaining and developing high-voltage installations), managing the electrical system (monitoring flows, maintaining the balance between electricity consumption and generation 24/7, importing and exporting to and from neighbouring countries) and facilitating the market (developing services and mechanisms with a view to developing the electricity market at national and European level).

On 17 September 2002, it was appointed as the federal transmission system operator in accordance with the Electricity Act of 29 April 1999.

[1][4] Elia is a contributor to the inter-regional electricity trading joint venture the European Market Coupling Company.