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Introduction:
The European Union’s move to phase Chinese-made inverters out of EU-funded energy projects has ignited a firestorm across the renewable energy sector. At the heart of the debate lies a sobering cybersecurity reality: an inverter sitting at the heart of a solar installation is internet-connected, enabling manufacturers to push updates and perform maintenance remotely — which means trusting that manufacturer not to push something you didn’t ask for. When a government can compel that manufacturer to act, the trust stops being a commercial relationship and becomes a geopolitical dependency. But beneath the political posturing, the inverter debate exposes a much deeper vulnerability that has plagued operational technology (OT) security for decades: most organisations simply don’t know what is actually running on their networks, or what those devices are communicating with.
Learning Objectives:
- Understand the geopolitical and cybersecurity risks posed by Chinese-made inverters in European energy infrastructure
- Learn how to discover, inventory, and map OT assets using practical Linux and Windows commands
- Master network traffic analysis techniques to identify unauthorised communications from industrial devices
- Implement remote access monitoring and access control measures for critical infrastructure
- Develop a continuous asset visibility programme aligned with NIS 2 Directive requirements
You Should Know:
- The Inverter Threat Model: Why Remote Access Changes Everything
Modern photovoltaic inverters are not passive electrical components; they are sophisticated networked computers that sit at the intersection of energy generation and grid stability. These devices must connect to the internet to perform basic grid functions, participate in energy markets, and receive firmware updates from manufacturers. This connectivity creates a direct attack surface that nation-states can exploit.
The threat is not hypothetical. A 2025 investigation revealed that solar inverters manufactured by Chinese companies and deployed across Western markets may contain communication modules capable of transmitting data without the user’s knowledge. These “ghost” communication devices can bypass firewalls, remotely disable inverters, or alter settings in ways that destabilise the grid. With six Chinese vendors collectively holding more than 200 GW of inverter capacity across Europe — roughly 70 percent of the market — the scale of potential disruption is staggering. Any coordinated action against this much capacity could cause cascading failures across the European grid.
The EU’s response has been swift but complicated. In April 2026, the Commission issued a directive barring EU funding for any energy project using inverters from China, Russia, Iran, or North Korea. Lithuania went further, passing legislation that since May 2025 prohibits manufacturers from high-risk countries from having remote access to installations above 100 kW. Existing systems must be retrofitted by May 2026. Meanwhile, the Dutch CDA has formally asked ministers how many Chinese inverters are installed in the Netherlands and whether they fall under critical-infrastructure protection.
Yet the Commission’s own roundtable in June 2026 confirmed what industry insiders already knew: a quick phase-out isn’t realistic because European producers can’t yet fill the gap. Chinese manufacturers like Huawei are not only cheaper than their European, American, or South Korean rivals — they also offer services and guarantees that would need to be replaced. The phase-out will face technical and financial obstacles, starting with the fact that China-made inverters generally integrate better with Chinese solar panels.
- Building Your OT Asset Inventory: The Foundation of Visibility
The hard part for most organisations was never “which vendor is allowed.” It’s the question underneath: what is actually running on my network, and what does it talk to? You don’t need a geopolitical risk model to care about that — you need an asset inventory and a network diagram that’s actually true.
Without visibility into what exists on the network, no security solution can be effective, no matter how powerful the implemented tools are. A well-defined network topology helps system administrators locate faults, troubleshoot issues, and identify potential security vulnerabilities. Here’s how to start building that visibility today.
Linux: Network Discovery and Asset Mapping
Begin by discovering active hosts on your OT network segments. Use `nmap` for comprehensive network scanning:
Discover all hosts on a /24 subnet with OS detection nmap -sn 192.168.1.0/24 Perform a more detailed scan of discovered hosts, identifying services and versions nmap -sV -p 1-1000 192.168.1.100 Scan for common OT protocols (Modbus, BACnet, S7, etc.) nmap -p 502,102,47808,44818 192.168.1.0/24
For continuous asset discovery, deploy `arp-scan` to identify devices by MAC address and vendor:
Scan local subnet for ARP responses arp-scan --local Scan specific interface with verbose output arp-scan -I eth0 192.168.1.0/24 --verbose
Export the results to a structured format for your inventory:
Generate CSV output for asset tracking
nmap -sn 192.168.1.0/24 | grep "Nmap scan" | awk '{print $5}' > asset_inventory.csv
Windows: Asset Discovery and Inventory
On Windows systems, use PowerShell for asset discovery and inventory management:
Discover active hosts on the local subnet
1..254 | ForEach-Object {
$ip = "192.168.1.$_"
if (Test-Connection $ip -Count 1 -Quiet) {
[bash]@{IP=$ip; Hostname=(Resolve-DnsName $ip -ErrorAction SilentlyContinue).NameHost}
}
} | Export-Csv -Path "asset_inventory.csv" -1oTypeInformation
Get detailed network adapter information
Get-1etAdapter | Select-Object Name, InterfaceDescription, MacAddress, Status
List all active network connections and associated processes
netstat -ano | Select-String "ESTABLISHED"
For a more complete inventory, combine these with manual walkdowns of physical sites. Record vendor, model, firmware version, IP address, network segment, physical location, and business function for each device. Distinguish clearly between IT-managed systems and OT-owned assets, even when they share network infrastructure.
- Network Traffic Analysis: Seeing What Your Devices Are Actually Saying
Discovering devices is only half the battle. You also need to understand what they’re communicating and with whom. This is where network traffic analysis becomes indispensable.
Linux: Capturing and Analysing Traffic with tcpdump and Wireshark
Use `tcpdump` to capture traffic from specific OT devices:
Capture all traffic from a specific IP address tcpdump -i eth0 host 192.168.1.100 -w inverter_traffic.pcap Capture traffic on port 502 (Modbus) with verbosity tcpdump -i eth0 port 502 -v -c 1000 Capture traffic and display in human-readable format tcpdump -i eth0 -A -s 0 host 192.168.1.100
For deeper analysis, use `tshark` (command-line Wireshark) to filter and analyse PCAP files:
Analyse a PCAP file for Modbus communications tshark -r inverter_traffic.pcap -Y "modbus" -T fields -e ip.src -e ip.dst -e modbus.func_code Extract all HTTP and HTTPS traffic (potential command-and-control) tshark -r inverter_traffic.pcap -Y "http or tls" -T fields -e ip.src -e ip.dst -e http.request.uri Identify all external IP addresses contacted tshark -r inverter_traffic.pcap -T fields -e ip.dst | sort | uniq -c | sort -1r
Windows: Traffic Analysis with PowerShell and Sysinternals
On Windows, use built-in tools and Sysinternals utilities:
Monitor active network connections in real-time
Get-1etTCPConnection | Where-Object {$_.State -eq "Established"} |
Select-Object LocalAddress, LocalPort, RemoteAddress, RemotePort, OwningProcess
Use Sysinternals TCPView (download from Microsoft)
TCPView provides a GUI for monitoring all active TCP/UDP connections
Save the output for baseline comparison
For ongoing monitoring, set up a SPAN port on your network switches to mirror traffic from OT segments to a dedicated analysis machine running Security Onion or similar IDS platforms.
4. Remote Access Monitoring and Kill-Switch Protection
The core of the inverter threat is unauthorised remote access. Organisations must implement robust monitoring and control mechanisms for all remote access channels.
Linux: Monitoring SSH and Remote Access Logs
Monitor SSH authentication attempts in real-time
tail -f /var/log/auth.log | grep "sshd"
Parse authentication logs for failed attempts
grep "Failed password" /var/log/auth.log | awk '{print $11}' | sort | uniq -c | sort -1r
Monitor active SSH sessions
who | grep pts
Check for unusual outbound SSH tunnels
ss -tunap | grep ESTAB | grep :22
Windows: Monitoring Remote Access Events
Check for RDP login events (Event ID 4624 for successful logon)
Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4624} |
Where-Object {$<em>.Properties[bash].Value -like "Remote"} |
Select-Object TimeCreated, @{N='User';E={$</em>.Properties[bash].Value}}, @{N='IP';E={$_.Properties[bash].Value}}
Monitor for scheduled tasks that might enable persistence
Get-ScheduledTask | Where-Object {$<em>.State -1e "Disabled"} |
Select-Object TaskName, State, @{N='Actions';E={$</em>.Actions.Execute}}
Check Windows Firewall for remote access rules
Get-1etFirewallRule | Where-Object {$<em>.Direction -eq "Inbound" -and $</em>.Action -eq "Allow"} |
Select-Object DisplayName, Direction, Action, Enabled
Implementing Kill-Switch Protection
The Lithuanian approach — barring remote access entirely for systems above 100 kW — represents the gold standard for critical infrastructure. For organisations that cannot immediately eliminate remote access, implement these controls:
- Network Segmentation: Isolate OT devices on separate VLANs with strict firewall rules. Only allow outbound connections to whitelisted manufacturer update servers.
-
Proxy All Remote Access: Force all manufacturer remote access through a managed jump host with full session logging and recording.
-
Implement Outbound Filtering: Use stateful firewalls to restrict outbound connections from inverters to only known-good IP addresses and ports.
-
Deploy an IDS/IPS: Monitor for unusual outbound traffic patterns that might indicate unauthorised command-and-control activity.
5. Continuous Compliance and the NIS 2 Directive
The NIS 2 Directive allows the Commission to conduct coordinated risk assessments of critical supply chains, similar to those carried out for 5G. Organisations should treat the inverter debate as a wake-up call to implement continuous compliance programmes.
Linux: Automating Compliance Checks
Create a script to check for open ports on critical OT devices
!/bin/bash
DEVICES=("192.168.1.100" "192.168.1.101" "192.168.1.102")
for DEVICE in "${DEVICES[@]}"; do
echo "Scanning $DEVICE..."
nmap -p 1-1024 $DEVICE | grep "open" >> compliance_report.txt
done
Check for outdated firmware (example using SNMP)
snmpwalk -v2c -c public 192.168.1.100 1.3.6.1.2.1.1.1.0 System description
Generate a baseline and alert on changes
md5sum /etc/network/interfaces > baseline_network.txt
Run periodically and compare
md5sum -c baseline_network.txt
Windows: Compliance Automation with PowerShell
Audit firewall rules against a compliance baseline
$BaselineRules = Get-Content -Path "firewall_baseline.txt"
$CurrentRules = Get-1etFirewallRule | Where-Object {$_.Enabled -eq $true} |
Select-Object DisplayName, Direction, Action
Compare-Object -ReferenceObject $BaselineRules -DifferenceObject $CurrentRules
Check for unauthorised administrative accounts
Get-LocalUser | Where-Object {$<em>.Enabled -eq $true} |
Select-Object Name, @{N='IsAdmin';E={($</em>.SID -like "S-1-5-21--500")}}
Generate a daily compliance report
$Report = @()
$Report += "=== COMPLIANCE REPORT $(Get-Date) ==="
$Report += "Open Ports:"
$Report += netstat -an | Select-String "LISTENING"
$Report | Out-File -FilePath "compliance_$(Get-Date -Format 'yyyyMMdd').txt"
What Undercode Say:
- Key Takeaway 1: The inverter debate is not really about inverters — it’s about the fundamental failure of OT asset management. Most organisations cannot answer basic questions about what is on their network, what those devices communicate with, or who has remote access. This visibility gap is the real vulnerability that geopolitical regulations are merely exposing.
-
Key Takeaway 2: Regulation is forcing the issue, but compliance alone is insufficient. The EU phase-out will take years, and European manufacturers cannot yet fill the gap. Organisations must take proactive steps now to inventory assets, monitor network traffic, and control remote access — not because a regulator demands it, but because the operational and security risks are existential.
Analysis: The inverter story is a perfect case study in how geopolitical risk and OT security converge. The threat is not that Chinese hardware is “proven malicious” — US authorities have found “no definitive evidence” of malicious wireless functions in Chinese inverters. The threat is structural: when a government can compel a manufacturer to act, the trust stops being a commercial relationship and becomes a dependency. This is the same argument that led to Chinese vendors being pushed out of 5G core networks in many countries. The difference is that energy infrastructure is more distributed, more difficult to secure, and vastly more critical to daily life. The 200 GW of Chinese inverter capacity across Europe represents a single point of failure that could be exploited with devastating effect. The EU’s response — banning funding, restricting remote access, and pushing for domestic manufacturing — is necessary but insufficient. Real security requires organisations to take ownership of their OT environments, starting with the unglamorous but essential work of building accurate asset inventories and network diagrams. The inverter debate is just the latest thing forcing a question OT security should have been asking all along: what is actually running on my network, and what does it talk to?
Prediction:
- +1 The regulatory pressure will accelerate the development of a European inverter manufacturing base, creating new economic opportunities and reducing supply chain dependencies over the next 5–10 years.
-
-1 In the short to medium term, the phase-out will cause significant project delays, cost increases, and potential grid instability as European manufacturers struggle to meet demand.
-
-1 The visibility gap in OT security will persist for most organisations, leaving them vulnerable not just to geopolitical manipulation but to ransomware, insider threats, and operational failures that exploit the same lack of asset awareness.
-
+1 The inverter debate will serve as a catalyst for broader OT security investment, forcing organisations to implement asset discovery, network monitoring, and access control measures that should have been in place all along.
-
-1 Nation-state actors will increasingly target the intersection of energy infrastructure and geopolitical friction, using the complexity of global supply chains to mask malicious activity in ways that are difficult to detect and attribute.
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