Entega is one of the leading energy and infrastructure service companies in Germany. In early 2008, the NATURpur institute was founded as a non-profit organisation, whose goal is to support environmental and climate protection initiatives.

The NATURpur institute contributes, within the framework of a Green City initiative, to the establishment of sustainable infrastructures which improve the general quality of life. This covers the move to the use of renewable energy, energy efficiency, good traffic connections, improved public and personal transport, promotion of ecology and consideration of sustainability in consumer behaviour.