Wolfgang Dotzler

GRAMMER Solar GmbH specializes in innovative solar technology and has been in the industry for over 40 years. The private company is based in Amberg, Germany. The German company's solar systems are manufactured in a zero-emissions factory and optimized with renowned institutes, ensuring high performance and quality. The company was founded in 1977, and the CEOs are Siegfried Schröpf and Wolfgang Dotzler.

EFR Europäische Funk-Rundsteuerung GmbH develops and installs audio frequency transmitter solutions. The firm provides long-wave services fore energy management, lighting control, feed-in management, data transmission and broadcasting, and smart grid service applications. Its product offerings encompass smart grid hub, easy metering, user terminal software, frequency control, and radio ripple control receivers. The company was founded in 1993 and is headquartered in Munich, Germany.