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Europe’s growing fleet of connected solar installations creates cybersecurity exposure through inverter platforms, local networks, installers, maintenance providers and aggregators. A compromised shared system could give an attacker influence over multiple installations. Experts say coordinated changes to generation could contribute to grid imbalances, congestion, voltage problems or outages—but these are assessed scenarios, not evidence that a cyberattack on renewable installations has caused a European blackout.
Why renewable energy infrastructure is becoming a cyber concern
Solar photovoltaic (PV) installations increasingly depend on digital systems to monitor performance, change settings and deliver firmware updates. Those connections can create routes into equipment that affects electricity generation. Risk is not limited to the inverter itself: manufacturer platforms, the networks connected to installations, and third parties with remote or maintenance access can all matter.
The scale of deployment makes the issue important, but installed capacity is not the same thing as exposed or attacker-controllable capacity. The Smart Energy Expert Group (SEEG) Working Group on Cybersecurity reports that EU installed PV generation grew from 86 GW in 2015 to 406 GW in 2025, and reproduces SolarPower Europe’s 2025 outlook projection of 718 GWdc in 2030. These are deployment figures, not cyber incident counts, and they do not mean every installation has the same connectivity or risk.
The European Commission’s page on critical infrastructure and cybersecurity identifies broader challenges for energy systems: electricity networks are interconnected, disruptions can cascade, and legacy systems must work alongside modern automation, smart meters and internet-connected devices. Some real-time systems also cannot accept security measures that introduce unacceptable delay.
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Where an attacker could gain access
The SEEG report, Recommendations to address cybersecurity risk in photovoltaic generation (Version 1.1, 1 October 2026), identifies several routes involving parties or systems that can access inverters. Manufacturer platforms may provide telemetry, settings changes or firmware updates; if a platform serves many customers, its concentration of access can magnify the potential reach of a compromise.
- Manufacturer platforms: An attacker who compromises platform infrastructure or credentials could potentially use the access the platform has to connected inverters.
- Local networks: A route through a site’s network could expose inverter communications or, in a utility-scale scenario assessed by the report, reach a remote-access firewall.
- Installers and maintenance providers: Their access may be necessary for setup and servicing, but it also makes third-party access and account security relevant.
- Aggregators: Systems coordinating multiple generation resources can create a shared point of access or control.
- Maliciously altered equipment or software: The report considers the possibility of an intentional backdoor in a manufacturer platform, inverter hardware or firmware.
The SEEG experts rate attacks against manufacturer platforms—particularly for residential and commercial/industrial installations—among their high-risk scenarios. They also rate an intentional backdoor across the use cases they consider, and a utility-scale attack through local networks that reaches a remote-access firewall, as high risk. These are expert assessments, not incident-database findings, measured probabilities or an official European Commission position.
Why installation size alone does not determine risk
For its analysis, the SEEG report uses four capacity-based PV categories. The report cautions that these bands do not map perfectly onto real installations; actual exposure and applicable rules also depend on the use case.
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| SEEG analysis category | Capacity band |
|---|---|
| Plug-in residential | Below 0.8 kW |
| Residential | 0.8 to 10 kW |
| Commercial and industrial | 10 kW to 1 MW |
| Utility-scale | Above 1 MW |
Capacity is only one factor in the potential consequences. Other relevant questions include who owns and operates the installation, whether it relies on remote services, whether access is concentrated in a shared platform, what third parties can do, and how much generation an attacker could influence at once. A smaller connected fleet under common control and a large utility site with a different access arrangement do not present identical scenarios.
What a coordinated attack could do to the grid
The SEEG report links potential impact to the amount of generation an attacker can control and to operating conditions. If an attacker changed generation across enough installations at the same time, the resulting difference between supply and demand could create an imbalance. If reserves could not counter it, frequency could move outside its permitted range and operators might need to disconnect load or generation.
The report also describes possible congestion if grid equipment is overloaded and voltage problems that could require operators to shut down part of the grid to maintain safety. A widespread outage is presented as a worst-case possibility, not a prediction or an observed consequence. Whether any of these outcomes followed would depend on the scale and timing of the change, the state of the electricity system and the available response.
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The report’s scope is deliberately narrower than every possible failure mode. It assesses malicious cyberattacks and impacts to the electricity system; it does not assess unintended programming or firmware-update failures, or analyze attackers using PV installations as a route into transmission or distribution system operator systems. It also says electrical safety and equipment damage merit further analysis.
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What European assessments say about the threat
The European Commission’s and ENISA-supported Risk assessment report on cyber resilience on EU’s telecommunications and electricity sectors, published 24 July 2024, identifies supply-chain risk as the main concern in both sectors, particularly for renewable-energy infrastructure and 5G rollout. For operational technology (OT), it highlights ransomware, data wipers and zero-day vulnerabilities as pressing concerns. The assessment separately identifies malicious insiders as the most critical electricity-sector risk in its evaluation, citing personnel-vetting and talent challenges.
Those findings concern the electricity and telecommunications sectors; they are not a count of attacks on solar installations. Available EU-wide energy figures likewise should not be read as renewable-specific prevalence:
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- 3.27%: ENISA’s February 2025 NIS360 – 2024 says energy accounted for this share of all recorded events during the 2024 Threat Landscape reporting period. DDoS and ransomware were among the common threats.
- 10%, of which 36% were attributed to malicious activity: The same ENISA report says energy made up this share of incidents reported on the CIRAS platform in 2023, and that 36% of those energy incidents were attributed to malicious activities. This is a different dataset and period from the recorded-events figure.
- 4,875 incidents: ENISA’s Threat Landscape 2025 analyzed incidents observed from 1 July 2024 to 30 June 2025. Its page notes a Version 1.3 revision on 22 September 2026 to correct figures and links. This is broad threat-landscape evidence, not a renewable-energy incident count.
The European Commission’s 2025 energy-system assessment says measuring the EU energy sector’s vulnerability to cyberattacks is difficult because official EU-level energy statistics are lacking. The available figures therefore do not establish how often renewable installations are specifically targeted or compromised.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.EU rules and what the expert group recommends
The European Union has both sector-specific and horizontal cybersecurity and resilience instruments. Commission Delegated Regulation (EU) 2024/1366—the electricity-sector network code on cybersecurity—addresses cyber aspects of cross-border electricity flows, including common minimum requirements, planning, monitoring, reporting and crisis management. NIS2, Directive (EU) 2022/2555, and the Critical Entities Resilience Directive, Directive (EU) 2022/2557, are also relevant frameworks.
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Practical controls for PV operators and suppliers
The 2026 SEEG report recommends controls intended to reduce the chance that access to one platform, device or supplier can be used to affect generation at scale. It distinguishes recommendations from existing universal legal obligations.
For manufacturers and platform operators
- Maintain a robust vulnerability-handling process for cloud platforms, with clear and enforceable patching timelines.
- Consider bug-bounty programs to encourage responsible reporting of vulnerabilities.
For utility-scale installations
- Document inverter traffic and protect it with encryption and authentication.
- Restrict outbound inverter connections to whitelisted servers under EU or equivalent jurisdiction.
- Allow no inbound communications from outside the local network.
For suppliers, maintenance and system planning
- Restrict components or software from suppliers assessed as posing significant cybersecurity risks.
- For commercial, industrial and utility-scale installations, replace manufacturer-triggered automatic firmware updates with controlled manual updates carried out by qualified maintenance providers.
- Include PV attack scenarios in electricity-system risk assessments.
These are SEEG recommendations; they should not be mistaken for a universal checklist of current statutory requirements. The report also emphasizes that cybersecurity measures must account for operational constraints in systems that need reliable, timely control.
Preparedness is not evidence of an attack
On 20 June 2024, the European Commission described Cyber Europe, an energy-sector exercise involving 30 national cybersecurity agencies and more than 1,000 experts to test coordination and crisis management in a large-scale cyberattack scenario. It was a preparedness exercise, not an incident report.
In the same announcement, Thierry Breton, then European Commissioner for Internal Market, said: “In 2023 alone, more than 200 reported cyber incidents targeted the energy sector, and more than half of them were directed specifically against Europe.” That statement concerns the energy sector generally; it does not identify a renewable-specific count. The SEEG report’s own summary is that “The growth has however created a significant cybersecurity risk to the EU’s electricity system.” Its disclaimer states that the report does not represent the European Commission’s opinion.
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