ACER publishes today a decision on the methodology for coordinating operational security analysis for all Transmission System Operators (TSOs). The decision, based on the EU Regulation on System Operation in electricity, will serve as a pan-European frame for the regional proposals on operational security coordination for each capacity calculation region (CCR).
Among other things, the decision covers harmonised rules to identify the elements of TSO's observability area and coordination of remedial actions inside a CCR and between CCRs. The methodology was originally developed by all TSOs and submitted for approval to National Regulatory Authorities (NRAs), before being referred to the Agency.
The Agency introduced some amendments to the proposal in order to improve its legal clarity, but also to impose more concrete and legally enforceable requirements on TSOs and Regional Security Coordinators (RSCs) with regard to their obligations to design and coordinate remedial actions.
The Decision also includes a requirement for TSOs to develop a probabilistic approach for risk assessment - to handle the reliability and costs of operation of a power system- and further defines the rules to deal with overlapping zones between CCRs as an amendment to the methodology.
Link to the Decision
Link to the adopted Coordinated Security Analysis Methodology
In December 2018, the Agency became competent to decide on the methodology for coordinated operational security analysis. In January and February 2019, the Agency consulted all interested stakeholders on this issue (find out more here).
All NRAs unanimously decided that the Agency should adopt a decision on the all TSOs' proposal for the methodology for coordinating operational security analysis.
The Agency amended the methodology in several instances where the methodology was not in line with the EU Regulation on System Operation in electricity, where it insufficiently described the requirements and functionalities of the regional coordination or where it was not clear or lacking with regard to reporting, the implementation time frame and managing future amendments.
The most notable amendments to the methodology are related to:
The deletion of the distinction between cross-border impacting vs cross-border relevant remedial actions;
The inclusion of rules for the design of remedial actions and the identification of cross-border relevant network elements and remedial actions;
The inclusion of high-level principles on cross-regional coordination and cost sharing;
The requirement for TSOs to develop a probabilistic approach for risk assessment as an amendment to the methodology by 2027.
For more information, please see the Decision.