Ransomware Attack Shakes Romanian Energy Sector

On December 26, 2025, a significant disruption unfolded at Complexul Energetic Oltenia, Romania’s leading coal-powered energy provider, following an attack by the Gentlemen ransomware group. This cyber intrusion impacted a variety of IT systems, affecting crucial operations like Enterprise Resource Planning (ERP), email services, and document management. Despite this, the company, which supplies nearly 30% of Romania’s electricity through its four facilities, assured that the National Energy System continues to function effectively. They are actively collaborating with authorities to restore their systems quickly.

The Gentlemen group has been responsible for almost 50 cyberattacks since its first appearance in August 2025. However, they have yet to confirm their involvement in this case, suggesting that negotiations with the energy provider might still be ongoing.

A Wave of Ransomware Challenges Europe

This event marks yet another instance in a series of ransomware incidents in Romania, with a recent attack targeting the national water authority as well. Meanwhile, across the UK, businesses face an increased frequency and severity of these attacks, threatening economic stability.

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