Spain’s CIUDEN tests 5.8 MWh sodium‑sulfur battery with solar and hydrogen
Spanish company CYMI has completed operational testing of a 5.8 MWh sodium‑sulfur (NaS) battery at the City of Energy Foundation’s (CIUDEN) Integra2H2 project, integrated with a 2.1 MW solar plant and two electrolyzers to produce green hydrogen. August 20, 2025 Pilar Sánchez Molina Image: Ciuden From ESS News Spanish company CYMI (Control y Montajes Industriales, of the COBRA IS group) has completed operational testing of the sodium-sulfur (NaS) energy storage facility which is part of...













