The below activities consist of technical exchanges between ENTSO-E and EU DSO Entity on operational topics relevant to the upcoming review of the System Operation Guideline (SOGL). 

Increasing Visibility of PV Infeed

TSOs face significant challenges with the PV infeed as there are no direct ways of controlling them, as many PVs are Type A generation units connected to the distribution grid, which are not subjected to observability nor controllability requirements. Thus, this can be promoted as a relevant topic for engagement between ENTSO-E and DSO Entity, including discussions on data exchange of their participation in different services.

Exchange of aggregated data for distribution-connected resources with limited capacity

The proliferation of small-scale generation, storage and flexible load resources in the distribution network is ongoing and expected to increase. This development must be accompanied with short-term forecasting and real-time observation of resources. Such information would also be helpful for TSOs when estimating contributions to e.g., balancing. The optimal aggregation of data of small capacity units to be shared between DSOs and TSOs must be further explored.

DSO-TSO cooperation on voltage management

Voltage management has become an increasingly important point of focus due to the significant growth of distributed generation. In this context, the implementation of the Requirement for Generators ensures that such generation has the capability to contribute to system voltage control, making it essential to establish a framework that enables the effective use of these capabilities. In addition, DSOs will also gain enhanced voltage‑control capabilities in their networks through future local services. In this context, TSO‑DSO cooperation would contribute to reach the optimum voltage management solution across the system.