As of most recent estimates, the cost of a BESS by MW is between $200,000 and $450,000, varying by location, system size, and market conditions. This translates to around $200 - $450 per kWh, though in some markets, prices have dropped as low as $150 per kWh. . to other LCOS models of VRFBs in the open literature. Lazard's annual levelized cost of storage analysis is a useful source for costs of various energy storage systems,and,in 2018,reported levelized VRFB costs in the ran e of 293-467 $MWh -1(for mid-scale accounts for a significant portion of the. . Energy storage is the process of storing energy produced at one moment for use at a later period in order to balance out the imbalance between energy production and demand. An accumulator or battery is a term used to describe a device that stores energy. There are several different types of energy. . How much does a 4 hour battery system cost?Figure ES-2 shows the overall capital cost for a 4-hour battery system based on those projections, with storage costs of $245/kWh, $326/kWh, and $403/kWh in and $159/kWh, $226/kWh, and $348/kWh in.