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

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).