If your site connects directly to the high-voltage grid, TenneT can send commands straight to your on-site controller to curtail or shut down the site, request more or less reactive power, or switch to a different reactive power mode.

That direct connection can also be a cybersecurity vulnerability. Equipment failure caused by malformed control traffic or a cyberattack can disrupt power transmission. This is why your park controller needs to be resilient and robust.

What Achilles Level 2 tests

AchillesFor more in-depth information on the Achilles tests, please visit this Achilles explainer article by Wurldtech. is an industry-recognized package for testing the communication robustness of industrial automation and control-system devices, including equipment used in power-grid environments, such as the Teleport Gateway. It sends large volumes of irregular and unexpected network traffic to a device and checks whether it keeps running and communicating. Level 2 follows the same approach as the regular test but is more thorough, with more pass/fail criteria.

Two ways this traffic can take a controller down:

• Storming: sending thousands of connection requests until the device stops responding.
• Fuzzing: sending unusual data to make the device react in unintended ways.

The testing is done by ENCS (European Network for Cyber Security), an independent organization that provides cybersecurity testing and standards for the energy sector.

What this means for the Teleport

After testing the Teleport’s Modbus and IEC 104 interfaces for robustness using custom ENCS fuzzers, the device is considered to meet Achilles Level 2 requirements for the test cases executed. Based on the results, the Teleport has reached the requirements for its usage in the Antares projectReturn’s Antares project in Waddinxveen reached a big milestone in the summer of 2026; they were able to connect the first large battery storage system to TenneT’s high-voltage grid in the Netherlands. With these 100 MW / 200 MWh, important flexible capacity is now unlocked and available to the Dutch energy grid. It allows to coordinate grid operator’s and off-takers’ commands, as well as local system constraints, all at the same time.

For more details and the video on the project, visit othe Return case on our reference projects page..

This shows the Teleport can handle large volumes of unexpected network traffic without losing its connection or going offline. For your site, that means one less way for a cyberattack to disrupt your operations.

If your site connects directly to the high-voltage grid, check with TenneT which requirements apply to your controller. If the Teleport is part of your project, we can walk you through what this approval covers for your setup.