Russia Deploys Low-Cost, Jam-Proof Drones in Attacks on Ukrainian Power Grid

Russia has adopted a new tactic using small, fiber-optic-guided drones to bypass sophisticated defenses and damage critical high-voltage electricity substations in Ukraine's northern Sumy region. This development represents a significant challenge to Ukraine's efforts to protect its energy infrastructure, according to open-source analysis verified by Reuters.

New Tactics Overcome Fortified Defenses

The attacks utilize First Person View (FPV) drones connected to their operators by a thin, translucent fiber-optic cable. This physical link makes them immune to the electronic warfare systems Ukraine widely deploys to jam the radio signals that control conventional drones, the Centre for Information Resilience (CIR), a London-based investigative group, reported.

Ukrainian authorities have heavily fortified key energy facilities with anti-drone nets and large concrete sarcophagi. However, Russian forces are reportedly using a two-drone approach: the first drone creates a hole in the protective netting, allowing a second drone to fly through the gap and strike a vulnerable component, such as a ventilation hole, to reach the core equipment.

Economic and Strategic Impact

The primary target of these strikes is the autotransformer, a central piece of equipment in a substation. The destruction of a single autotransformer in a 330-kilovolt (kV) substation can disable the entire unit and costs approximately $3.5 million to replace, according to Oleksandr Kharchenko, head of the Energy Research Centre in Kyiv.

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In stark contrast, the fiber-optic FPV drones used in the attacks can cost as little as $2,000. Joshua Scriven, an investigator at CIR, described the cost-benefit analysis as "staggering." CIR has verified at least four such strikes on large 330 kV substations and four more on smaller 110 kV facilities, some as far as 26 km (16 miles) from the frontline.

Broader Campaign Against Energy Infrastructure

These attacks are part of a wider Russian strategy to degrade Ukraine's energy grid, particularly in frontline regions. Scriven noted that the objective appears to be isolating regions like Sumy from the national grid before targeting local power stations to cause widespread blackouts.

This campaign continues despite the International Criminal Court issuing arrest warrants for senior Russian commanders over previous strikes on Ukraine's power grid. Ukrainian Defence Minister Mykhailo Fedorov stated that Russia's goal is to "terrorise people and make life in the border regions unbearable."