Operation of today’s increasingly complex power systems requires comprehensive training of system operators and operations engineers. By increasing their awareness and understanding of dynamic phenomena, the EPRI Power System Dynamics Tutorial can improve an operator’s ability to take effective action—either preventive or corrective. This latest version of the tutorial represents an update of key topics to reflect industry restructuring under the vision of the Federal Energy Regulatory Commission (FERC) as well as current Reliability Standards issued by the North American Electric Reliability Council (NERC). In addition, a new section briefly describes the basic concepts of the Wide Area Measurement System (WAMS) and Wide Area Control System (WACS).