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A UK power plant was shut down for four days following a cyberattack linked to Iranian hackers, according to British newspaper The Telegraph.
The attack reportedly took place in July.
The UK’s National Cyber Security Centre (NCSC) said the incident affected a small power plant and did not disrupt the country’s overall electricity system.
The centre did not identify the facility.
The attackers were reportedly linked to the Iranian government. However, the UK authorities said the targeted facility was neither a major power plant nor an emergency service, and the incident did not pose a threat to the wider energy system.
The UK government has also kept the name of the affected plant confidential for security reasons.
The country has several small gas-fired power plants that are used for short periods when electricity demand rises suddenly.
Following the incident, the Department for Energy Security and Net Zero (DESNZ) contacted power companies to provide advice on cyberattack risks.
The government is also updating cybersecurity regulations amid growing concerns over threats to energy infrastructure.
The incident is being viewed as an unprecedented cyberattack on Britain’s electricity infrastructure.
Although it did not affect the national grid, it has raised fresh concerns about the vulnerability of critical infrastructure to state-linked cyber threats.