CHAPTER 3

Each TSO shall determine the observability area of the transmission-connected distribution systems which is needed for the TSO to determine the system state accurately and efficiently, based on the methodology developed in accordance with Article 75. If a TSO considers that a non-transmission-connected distribution system has a significant influence in terms of voltage, power flows or other electrical parameters for the representation of the transmission system's behaviour, such distribution system shall be defined by the TSO as being part of the observability area in accordance with Article 75. The structural information related to the observability area referred to in paragraphs 1 and 2 provided by each DSO to the TSO shall include at least: substations by voltage; lines that connect the substations referred to in point (a); transformers from the substations referred to in point (a); SGUs; and reactors and capacitors connected to the substations referred to in point (a). Each transmission-connected DSO shall provide the TSO with an update of the structural information in accordance with paragraph 3 at least every 6 months. At least once a year, each transmission-connected DSO shall provide the TSO, per primary energy sources, the total aggregated generating capacity of the type A power generating modules subject to requirements of Regulation (EU) 2016/631 and the best possible estimates of generating capacity of type A power generating modules not subject to or derogated from Regulation (EU) 2016/631, connected to its distribution system, and the related information concerning their frequency behaviour. Unless otherwise provided by the TSO, each DSO shall provide its TSO, in real-time, the information related to the observability area of the TSO as referred to in Article 43(1) and (2), including: the actual substation topology; the active and reactive power in line bay; the active and reactive power in transformer bay; the active and reactive power injection in power generating facility bay; the tap positions of transformers connected to the transmission system; the busbar voltages; the reactive power in reactor and capacitor bay; the best available data for aggregated generation per primary energy source in the DSO area; and the best available data for aggregated demand in the DSO area.

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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.