PJM Interconnection (PJM) and 12 of its member transmission owners are deploying synchrophasor measurement devices in 81 of its high voltage substations and are implementing a robust data collection network. This project complements existing equipment to provide the necessary information technology infrastructure and wide-area monitoring and coverage of the PJM system to support further development of more advanced applications. The project is aimed at improving electric system reliability and restoration procedures, and preventing the spread of local outages to neighboring regions. The project deploys phasor measurement units, phasor data concentrators, communication systems, and advanced transmission software applications. These devices increase grid operators’ visibility of bulk power system conditions in near real time, enable earlier detection of problems that threaten grid stability or cause outages, and facilitate information sharing with neighboring control areas. Access to better system operating information allows PJM engineers to improve power system models and analysis tools for better reliability and operating efficiency.