01 September 2014
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    In accordance with the legislation in force, the following types of agents carry out activities at SNGN (National System of Natural Gas):

    LNG Terminal Operator

    The LNG reception, storage and re-gasification terminal operator is the concessionary entity of the respective terminal and is responsible for ensuring its exploitation and maintenance as well as its storage and re-gasification capacity under safe and reliable conditions and with quality service. The LNG Terminal is a group of infrastructures directly connected to the Transmission network aimed at the reception and shipping of LNG carriers, storage, treatment and re-gasification of LNG and its later supply to the Transmission network, as well as the loading of the LNG into the tankers and carriers.

    Underground Storage Operators

    The natural gas underground storage operators are concessionary entities of the respective underground storage responsible for the exploitation and maintenance of the storage capacities and surface infrastructures under safe and reliable conditions and with quality service. Underground Storage allows natural gas to be stored in a gas form in underground cavities, or tanks specially built for the purpose, and later allows it to be injected into the
    Transmission network.

    Transmission Network Operator

    The Transmission network operator is the concessionary entity responsible for the exploitation, maintenance and development of the Transmission network in safe and reliable conditions and with quality service, as well as its interconnections with other networks. The Transmission Network Operator must ensure the long term capacity of the network.

    Distribution Network Operators

    The distribution network operators are public service distribution concessionary entities or licence holders responsible for the exploitation, maintenance and development of the distribution network, in a specific area, in safe and reliable conditions and with quality service, as well as its interconnections with other networks, when applicable, and must ensure the long term capacity of the network.

    Suppliers

    Suppliers are entities with licences to sell natural gas and who freely exercise commercial activity. The suppliers can buy natural gas to supply their clients signing bilateral contracts or through participation in organised markets.

    Last Resort Suppliers

    Retail last resort suppliers are entities with a last resort vendor’s licence who are obliged to ensure the supply of natural gas to all consumers with an annual consumption of less than 2 million m3 who are connected to the network and who, as an option, do not wish to maintain a contractual relationship with another vendor, thereby being subject to the regime of regulated tariffs and prices.
    The Wholesale last resort supplier is an entity with a last resort vendor license who is obliged to ensure the supply of natural gas to retail last resort suppliers and large clients (annual consumption higher than 2 million m3) who, as an option, do not wish to maintain a contractual relationship with another vendor, thereby being subject to the regime of regulated tariffs and prices.

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