All kinds of commercial private actors.

Actors that sell energy to consumers.

The entities that are in charge of the electricity/gas/heating grid operation. In the liberalised model, these entities are not allowed to be energy suppliers.

These are municipalities.

The national government of a country.

Non-profit organisations.

Larger sub-national governments, which could be called provinces, regions or states depending on the country.

The regulator is the entity that regulates the energy markets, primarily the electricity and gas markets.