(ANSA-AFP) - BERLIN, NOV 14 - Germany announced Monday it was nationalising a former subsidiary of Russian energy giant Gazprom, saying the step was necessary because of the systemic relevance of the company for power supplies in the country. The company Securing Energy for Europe GmbH (SEFE) was previously known as Gazprom Germania. It is a network operator, and indirectly controls Germany's largest gas storage facility in the northwestern town of Rehden. (ANSA-AFP).