Power Capacity (MW) refers to the maximum rate at which a BESS can charge or discharge electricity. For example, a BESS rated at 10 MW can deliver or absorb up to 10 megawatts of power. Battery storage is a technology that enables power system operators and utilities to store energy for later use. A battery energy storage system (BESS) is an electrochemical device that charges (or collects energy) from the grid or a power plant and then discharges that energy at a later time to. Battery Energy Storage Systems (BESS) are essential components in modern energy infrastructure, particularly for integrating renewable energy sources and enhancing grid stability. A fundamental understanding of three key parameters—power capacity (measured in megawatts, MW), energy capacity. This report describes development of an effort to assess Battery Energy Storage System (BESS) performance that the U. These specifications determine performance, efficiency, lifespan, and overall suitability for your energy needs. These systems offer grid operators flex-ibility to shift, balance, and smooth power flows in a variety of applications.