A risk assessment has been performed and contingency plans are now in place to reduce the risk and impact of any further attacks. It is important to note that the ENTSO-E office network is not connected to any operational TSO system. Our TSO members have been informed and we continue to monitor and assess the situation.

https://www.entsoe.eu/news/2020/03/09/entso-e-has-recently-found-evidence-of-a-successful-cyber-intrusion-into-its-office-network/