ARIEMA has diversified in recent years. Currently, it participates in various companies with the following business structure:

• Ariema Enegia y Medioambiente S.L: Mother company located in Tres Cantos, Madrid. Spanish company related to hydrogen technology and fuel cells with over 30 years of experience in the sector. It focuses on engineering, equipment and installations, consultancy and training.

• ARIEMA Enerxía S.L. Affiliated company currently located in Huelva, focuses its activity on the development and promotion of hydrogen production systems by electrolysis. It was established in 2006 in Santiago de Compostela to specifically develop applications for the naval sector and the food industry based on hydrogen technology.