<ul><li>Researchers have found that renewable energy facilities in Central Europe use unencrypted radio signals.</li><li>The signals are used to receive commands to feed or ditch power into or from the grid serving 450 million people in Europe.</li><li>The researchers accidentally discovered this vulnerability while working on a different hacking project.</li><li>This finding raises concerns about the potential for a coordinated attack on the European power grid.</li></ul>

Researchers say new attack could take down the European power grid

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