Spain is making significant strides in the renewable energy sector with the recent completion of a sodium-sulfur Battery Energy Storage System (BESS) by CIUDEN. This facility will be used to store renewable energy from a 2.1 MW solar photovoltaic plant and to power two electrolyzers: one polymer membrane (PEM) and the other high-temperature solid oxide electrolysis cell (SOEC) for the production of green hydrogen. This development is part of a broader initiative to enhance the country’s green hydrogen capabilities.
The project, spearheaded by Spain’s Foundation of the City of Energy (CIUDEN), marks an important milestone in clean energy storage technology. CIUDEN, integrated under the Ministry for the Ecological Transition and the Demographic Challenge, is dedicated to advancing sustainable energy solutions.
Located in Cubillos del Sil, León, the sodium-sulfur BESS is expected to improve storage and management of renewable energy, addressing one of the critical challenges in the sector—energy reliability. The system is designed to bolster energy stability, supporting the production of green hydrogen by ensuring a steady supply of stored renewable power.
Green hydrogen, produced by using renewable energy to split water molecules, is considered a vital component in reducing carbon emissions and combating climate change. The recent BESS completion enhances Spain’s capability to produce and store green hydrogen, positioning the country as a leader in sustainable energy solutions.
Sodium-sulfur batteries are known for their high energy density and long discharge time, making them particularly suitable for large-scale energy storage applications. The batteries for the project were manufactured by the Japanese company NGK, whose European distributor is the German company BASF. This technology will support Spain’s ambitious goals of transitioning to a low-carbon economy, aligning with broader European Union objectives.
This NaS (sodium-sulfur) battery energy storage system operates at a temperature of 581°F (305°C) so that the electrodes are in a molten state. Testing was performed upon receipt, including a cold start-up test to verify the operation of each individual unit, as well as tests involving the entire system, known as hot tests, operational tests, and performance tests. The maximum nominal charge/discharge power of the batteries is 1,000 kW/750 kW, and the minimum nominal stored energy is 5,800 kWh. The operational, commissioning, and performance tests were successful and they certified that the operating limits were met.
The project reflects a collaborative effort among government organizations, researchers, and the private sector. By integrating advanced storage solutions, Spain aims to mitigate energy shortages and pave the way for more consistent renewable energy use. Additionally, these efforts strengthen the foundation necessary for scalable green hydrogen production, offering promising industrial applications and paving the way for further innovations.
Spain’s green hydrogen project also holds potential implications on a global scale. As countries worldwide seek sustainable energy solutions, Spain’s advancements may serve as a model, showcasing the potential of combining renewable energy with innovative storage technologies.
The completion of CIUDEN’s sodium-sulfur BESS marks a pivotal moment in Spain’s renewable energy landscape, underscoring the country’s commitment to pioneering green technologies and leading efforts towards a more sustainable future.
Source: CIUDEN Completes Sodium-Sulfur BESS for Green Hydrogen
Photo Credit: CIUDEN
