DUESSELDORF, Germany (Reuters) -German policymakers should team up with power grid operators to improve the response to incidents such as the arson attack near Tesla's gigafactory, said the head of regional utility Westenergie. Security measures needed reviewing and a better legal framework created, Westenergie's chief executive Katherina Reiche told reporters in Duesseldorf. "Critical infrastructure is vulnerable," said Reiche, whose subsidiary Westnetz dealt with restoring power to tens of thousands of households in western Germany after flooding in 2021.