A small British power plant was forced offline for four days following an unprecedented cyberattack carried out by Iranian-linked hackers, according to an investigation published by The Telegraph.
The incident, believed to mark the first time Iranian cyber actors have successfully caused an operational shutdown at a UK electricity-generating facility, did not disrupt the wider national grid or cut power to homes and businesses.
British officials declined to name the specific site, citing national security protocols. A government spokesperson stated that the breach involved a “small-scale energy generator” and emphasized that “at no point was there a risk to the wider energy system”.
The breach occurred alongside a broader wave of digital intrusions that hit water and wastewater systems across at least 12 U.S. states.
Those American disruptions—affecting facilities in states including Minnesota, Michigan, and Georgia—caused localized flooding and tap pressure drops, leading some municipal authorities to issue temporary boil-water notices. U.S. intelligence sources and cybersecurity analysts linked the activity to actors operating on behalf of Tehran.
Following the UK outage, government security officials notified the National Cyber Security Centre (NCSC) and held private briefings with chief executives across the energy sector, distributing updated defense guidance and threat indicators to utility operators.
Cybersecurity researchers note that while large-scale utilities typically employ air-gapped industrial controls, smaller municipal or private operators often remain vulnerable to internet-exposed operational hardware and unpatched remote access points.
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