Grid Connection Capacity of the Slovenian Transmission System

In recent years, the Slovenian power system has experienced a rapid increase in requests for the connection of Battery Energy Storage Systems (BESS), renewable energy sources (RES), data centres, and other large-scale network users. As the available connection capacity varies between individual transmission substations (RTPs) due to technical constraints and network capabilities, selecting an appropriate connection location is of key importance.

To increase transparency and facilitate the planning of new grid connections, ELES has developed an interactive map showing the estimated available connection capacities of individual transmission substations for the connection of new users. The estimates are based on transmission system simulations under normal and contingency conditions (N and N-1 criteria), as well as spatial analyses of the potential integration of new facilities (e.g., battery energy storage systems).

The interactive map provides prospective users with an overview of the estimated available connection capacities at individual substations, thereby supporting the planning of new connections and the selection of suitable connection locations. The presented data are for information purposes only and are based on the state of the power system at the time the analysis was performed.

When interpreting the results, it should be noted that the connection capacities of individual substations are interdependent. The connection of a large facility at one location may affect the available capacity at neighbouring substations. Consequently, the information presented on the map will be updated regularly in line with network developments and newly connected facilities.

For the purposes of the analysis, the maximum connection capacity assessed for an individual facility was limited to 200 MW. Reaching the 200 MW threshold does not imply that a higher connection capacity is not feasible; rather, it indicates that capacities above this value were not evaluated within the scope of the study.
The interactive map is available at the following link: Atlas.