What exactly is the national security argument here?

Janet Yellen, the US treasury secretary, has called on the EU to intervene quickly to reduce rising levels of Chinese exports of green goods including solar panels and wind turbines, forcing European leaders to move into a full-blown trade war.

Here is the full story. And from the FT two days ago: “Most European energy companies have scaled back or revised their targets to develop renewable energy because of high costs…” Where is the national security argument? The biggest risk is that China will stop sending wind turbines to Germany? What’s in China’s lap anyway? And according to GPT-4o those turbines have an average life of 20-25 years? Well folks, we’re not stupid…