The document outlines the commissioning process for a battery energy storage system (BESS). It involves extensive testing and verification of the BESS components, functions, safety mechanisms, grid integration, and performance to ensure it operates as intended before being. . The commissioning process ensures that energy storage systems (ESSs) and subsystems have been properly designed, installed, and tested prior to safe operation. This system is typically used for large-scale energy storage applications like renewable energy i tegration,grid stabilization,or b gration, grid stabilization, or backup pow stall a Battery Energy Storage System (BESS). The battery ESS consists of multiple battery cells, creating a large system with. . The Industrial and Commercial (C&I) Energy Storage: Construction, Commissioning, and O&M Guide provides a detailed overview of the processes involved in building, commissioning, and maintaining energy storage systems for industrial and commercial applications. ESTAP is conducted under contract with Sandia National Laboratories, with funding from US DOE. Facilitate public/private. .