Cybersecurity Risks and Threats to Aging Critical Infrastructure and Renewable Energy Systems

Critical infrastructure worldwide, including power grids, water systems, and transportation networks, is increasingly vulnerable due to aging hardware and outdated cybersecurity measures. Many of these systems, built between the 1950s and 1970s, were never designed for the hyperconnected digital environment of today, leaving them exposed to both physical decay and cyber threats. In the United States, nearly 70% of the power grid is over 25 years old, and similar conditions exist in Europe, with a significant portion of bridges and other infrastructure in need of repair. As operators modernize these systems with digital controls and cloud-based monitoring, new attack surfaces emerge, such as legacy interfaces, unpatched software, and unsupported protocols, which can be exploited by threat actors. The interconnectedness of these systems means that a single vulnerability, such as an infected maintenance laptop or a misconfigured firewall, can have cascading effects across multiple sectors. The adoption of digital twins and shared data platforms is helping operators predict failures and coordinate responses, but the risk remains high. The rapid growth of renewable energy, particularly solar power, has introduced additional cybersecurity challenges. Solar inverters, aggregators, and control software have become attractive targets for cybercriminals, as demonstrated by real-world incidents where hackers exploited default credentials and known software flaws to hijack remote monitoring devices. The FBI has issued alerts about threats to renewable energy systems, and experts warn that tampering with connected infrastructures, including EV charging networks, could lead to widespread blackouts. The transition to renewables is outpacing the implementation of robust cybersecurity measures, making the sector a potential weak link in national energy resilience. High-profile attacks, such as the hijacking of 800 monitoring devices in Japan using a Mirai botnet-linked vulnerability, highlight the global nature of the threat. Hacktivist groups have also targeted solar monitoring systems, further exposing the sector's vulnerabilities. The integration of renewables into the grid, often outside the direct control of traditional operators, complicates efforts to secure the entire energy ecosystem. As the share of renewables in power generation is projected to rise significantly by 2030, the urgency to address these cybersecurity gaps is growing. Experts emphasize the need for proactive monitoring, regular updates, and coordinated information sharing between engineers and security teams to mitigate risks. The resilience of critical infrastructure now depends not only on physical maintenance but also on the ability to anticipate and defend against sophisticated cyber threats targeting both legacy and emerging technologies.