​​​​​​​In recent years, there has been a rapid pace of inverter-based resources (IBRs) interconnecting to the bulk power system, including transmission and sub-transmission systems. IEEE 2800 was published in April 2022 to address the gap in interconnection requirements of IBRs into the bulk power system and the misapplication of IEEE 1547, and to complement the North American Reliability Standard set by FERC and NERC. This advisory explains the IEEE 2800-2022 performance standard.