Hydro 21 is a leading center for hydroelectricity in Europe, focusing on promoting renewable energy, fostering industry collaboration, and disseminating scientific, technical, economic, and political knowledge about hydroelectricity. Located in Grenoble, this center brings together key players in the hydroelectric sector, including major global companies, engineering firms, research centers, and service providers.

The 4th RDV Experts Hydro took place from April 16 to 18, 2024. This event focused on the theme of fabrication addition and attracted a significant number of exhibitors and attendees. The event was held at Alpexpo in Grenoble, with a total exhibition area of [specific area]. The precise number of exhibitors and visitors was not provided but the event was well-attended by industry professionals.

Hydro 21 is governed by a council and board consisting of several members. It aims to promote the economic development of Grenoble by supporting its key players in the hydroelectric sector. The organization regularly hosts events such as Business Hydro and Focus Hydro to inform the public about the latest developments in hydroelectric technology.

The next Business Hydro event is scheduled for October 14-15, 2025, at Alpexpo in Grenoble. Previous events have covered themes such as modernization and flexibility in hydroelectricity. These events provide valuable networking opportunities for industry experts and contribute to the advancement of the hydroelectric sector.