Cellcube Energy Storage Systems Inc. launch its new generation of CellCube product series the FB250 and FB500. The energy storage systems reach new performance and flexibility standards for flow batteries in terms of cycling, power-rating, efficiency and lifetime. Projects on the megawatt scale are now feasible and attractive at the lowest levelized cost of storage (LCOS), from a commercial perspective but also meeting operational standards over its lifetime, specifically in co-location with renewable power generation or as part of power-pools for reserve and capacity markets. In the upcoming formal launch at the Intersolar & and EES Exhibition in Munich (booth C2.534) in May this year, CellCube will release its final datasheets. All new FB250's and FB500's will come with improved efficiencies reaching up to 94% for charging and 88% for discharging. The system can be operated on a permanent overrated power of up to 200% without resting, which offers in combination 3 different energy tank sizes and a very flexible solution range between 3 and 12 hours at lowest cost on industrial level.