Walter Schmidt

Trionista Topco GmbH is a firm with interests in energy services. Its services include development, production and distribution of products for measurement, control of energy consumption, and services relating to the metering and billing of energy consumption data. In addition the firm's service also includes the provision of services to other businesses. The company was founded on September 16, 2013 and is headquartered in Essen, Germany.

ista International GmbH engages in the provision of energy management services. It also offers detect and protect solutions that include installation and maintenance of smoke alarm devices; and provision of leakage detection and tap maintenance and drinking water analysis services. The company was founded by Johannes Schultz and Karl Volker in 1957 and is headquartered in Essen, Germany.