1.04MWh Vanadium flow battery in Spain
https://www.energy-storage.news/utility-edp-to-deploy-vanadium-flow-battery-for-hybrid-storage-project-at-retiring-thermal-plant-in-spain/
Kind of shows the lack of capacity of VRFBs. While the average project size is 500MWh, this VRFB's capacity is 1MWh. Quite obviously VRFBs can't compete in the high and mid size league.