BATTERY RACK, ENERGY STORAGE SYSTEM, AND POWER GENERATION SYSTEM

Provided is a battery rack that is easy to install, an energy storage system, and a power generation system. The battery rack includes a plurality of battery modules arranged in one direction; and a rack case configured to accommodate the plurality of battery modules, wherein the rack case includes a fixing unit including a main body part of a plate shape provided on a lower end portion of the rack case, and a fixing groove formed to be recessed from an edge of the main body part.