Regional coordination
Article 6
1. When designing its system defence plan pursuant to Article 11 and its restoration plan pursuant to Article 23 or when reviewing its system defence plan pursuant to Article 50 and its restoration plan pursuant to Article 51, each TSO shall ensure the consistency with the corresponding measures in the plans of TSOs within its synchronous area and in the plans of neighbouring TSOs belonging to another synchronous area of at least the following measures: (a) inter-TSO assistance and coordination in emergency state, pursuant to Article 14; (b) frequency management procedures, pursuant to Article 18 and Article 28, excluding the establishment of target frequency in case of bottom-up re-energisation strategy before any resynchronisation to the interconnected transmission system; (c) assistance for active power procedure, pursuant to Article 21; (d) top-down re-energisation strategy, pursuant to Article 27. 2. The consistency assessment of the system defence plan and the restoration plan in accordance with paragraph 1 shall include the following tasks: (a) exchange of information and data related to the measures referred to in paragraph 1 among the TSOs concerned; (b) identification of incompatibilities of measures referred to in paragraph 1, in the plans of the involved TSOs; (c) identification of potential threats to operational security in the capacity calculation region. These threats include, inter alia, regional common mode failures with significant impact on the transmission systems of the involved TSOs; (d) assessment of the effectiveness of measures referred to in paragraph 1 specified in the system defence plans and the restoration plans of the involved TSOs, to manage the potential threats referred to in point (c); (e) consultation with RSCs to assess the consistency of measures referred to in paragraph 1 within the entire concerned synchronous area; (f) identification of mitigation actions in case of incompatibilities in the system defence plans and the restoration plans of the involved TSOs or in case that measures are missing in the system defence plans and the restoration plans of the involved TSOs. 3. By 18 December 2018, each TSO shall transmit the measures referred to in paragraph 1 to the relevant RSC(s) set up pursuant to Article 77 of Regulation (EU) 2017/1485. Within 3 months from the submission of the measures, the RSC(s) shall produce a technical report on the consistency of the measures based on the criteria set out in paragraph 2. Each TSO shall ensure the availability of its own skilled experts to assist the RSC(s) in preparing this report. 4. The RSC(s) shall transmit without delay the technical report referred to in paragraph 3 to all the TSOs involved, which shall in turn transmit it to the relevant regulatory authorities, as well as to ENTSO for Electricity, for the purposes of Article 52. 5. All TSOs of each capacity calculation region shall agree on a threshold above which the impact of actions of one or more TSOs in the emergency, blackout or restoration states is considered significant for other TSOs within the capacity calculation region.