Escalating Cyber Threats in Energy Sector Targeting OT Systems

• •Destructive attacks on Polish energy facilities occurred on December 29, 2025.
• •U.S. advisory in April 2026 warns of Iranian exploitation of internet-facing PLCs.
• •Cyber risks now extend to remote renewable sites and various OT systems.

The OT Cybersecurity Information Sharing and Analysis Center (OT-ISAC) issued a threat advisory detailing a worsening cyber threat landscape for the energy sector, particularly affecting operational technology (OT) systems. Key incidents include destructive attacks on Polish renewable energy facilities on December 29, 2025, and a U.S. advisory in April 2026 regarding Iranian-affiliated exploitation of internet-facing programmable logic controllers (PLCs). The advisory emphasizes that cyber risks are no longer limited to central control rooms but extend to remote renewable sites, engineering workstations, and various distributed energy assets. The report highlights a medium to high confidence level in the global threat to OT systems, with a specific focus on the Asia-Pacific (APAC) region, where vulnerabilities remain underreported. The advisory calls for increased vigilance and proactive measures to mitigate risks associated with exposed OT systems and weak vendor access pathways. Overall, the report indicates a high sector-wide exposure to cyber threats, particularly for internet-exposed OT systems.