A Transmission System Operator (TSO) is a commercial company authorized for the construction, operation and maintenance of backbone facilities and certified in accordance with the procedure established in Laws 34 / 1998, of 7 October, of the hydrocarbons sector for Gas and 54/1997, of November 27, of the electricity sector for electricity. Responsibilities Legal framework
Directive 2003/54 / EC requires each EU member state to designate a minimum of one TSO. Los TSO Spain Portugal Notes and
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