Siemens Gamesa Renewable Energy (SGRE) has made another step in hybridisation of renewable energy as it began testing a battery storage technology at its La Plana test site in Spain.

The wind OEM has commissioned a redox flow energy storage system at its research and development site near Zaragoza. The system is connected to the hybrid controller of the combined wind and PV generation system and supplements the lithium-ion batteries that have been in use here for around two years.