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Solar Inverter Vulnerabilities Highlight Growing Cybersecurity Risks
August 15, 2025
A recent advisory from the U.S. Cybersecurity and Infrastructure Security Agency (CISA) has drawn attention to security flaws in EG4 Electronics’ solar inverters, raising concerns about the cybersecurity of residential energy systems.
The vulnerabilities could allow attackers on the same network to intercept data, install malicious firmware, or seize control of affected inverters. EG4, which has around 55,000 impacted customers, faced criticism for not immediately notifying users. Some complained that basic protections — such as encryption and proper authentication — were missing.
CEO James Showalter acknowledged the issues but called them industry-wide, noting that solar inverters have quietly evolved into critical energy infrastructure. Once simple converters, they now connect homes to utilities, feed power back to the grid, and form part of an expanding, distributed energy network.
Experts warn that while a mass attack on residential systems is unlikely, the aggregate risk is growing. As more homes generate and share power, each inverter becomes a potential entry point into the grid. Unlike large power plants, residential systems operate in a regulatory gray zone without strict cybersecurity standards.
EG4 says it is working with CISA to patch the flaws and improve security protocols. But the incident underscores a broader reality: as clean energy adoption accelerates, cybersecurity is becoming as essential to the grid as the hardware itself.
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