Equipment cost ratio of energy storage projects provides estimates for turnkey installed costs, maintenance costs, and battery . . This chapter, including a pricing survey, provides the industry with a standardized energy storage system pricing benchmark so these customers can discover comparable prices at different market levels. Department of Energy (DOE) Federal Energy Management Program (FEMP) and others can employ to evaluate performance of deployed BESS or solar photovoltaic (PV) +BESS systems. What Determines EPC Costs for Energy Storage. . The 2020 Cost and Performance Assessment provided installed costs for six energy storage technologies: lithium-ion (Li-ion) batteries, lead-acid batteries, vanadium redox flow batteries, pumped storage hydro, compressed-air energy storage, and hydrogen energy storage. By 2030,total installed costs could fall between 50% and 60% (and battery cell costs by even more),driven by optimisation of manufacturing facilities,combined with better combinations. .