1.

Neighbouring TSOs shall exchange at least the following structural information related to the observability area: the regular topology of substations and other relevant data, by voltage level; technical data on transmission lines; technical data on transformers connecting the DSOs, SGUs which are demand facilities and generators' block-transformers of SGUs which are power generating facilities; the maximum and minimum active and reactive power of SGUs which are power generating modules; technical data on phase-shifting transformers; technical data on HVDC systems; technical data on reactors, capacitors and static volt-ampere reactive (VAR) compensators; and operational security limits defined by each TSO according to Article 25.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-04 · Text as adopted (Official Journal); later amendments are not incorporated in this text.