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In this paper, the National Power Quality Monitoring System, which is designed to monitor the power quality (PQ) of the Turkish Electricity Transmission System is presented. The National PQ Monitoring System consists of three main parts: PQ monitors, which are installed all over the country; a monitoring center, which collects the data sent by the power quality monitors in a database and provides assessment facilities; and a client software for remote connection to the center and analysis of the collected PQ data. PQ monitors compute the PQ parameters according to the IEC-Standard-61000-4-30. The PQ monitoring center is located in the TEIAS Ankara Bahcelievler campus and it has a huge digital light processing (DLP) display to observe the PQ events on the map of Turkey as soon as the event occurs. The client software provides remote connection from universities, research institutes and TEIAS offices to the monitoring center to analyse the collected PQ data. This is a three-year project which started in March 2006 To date, PQ monitor design has been completed. 9 monitors have been installed at various transformer substations in Turkey and the monitoring center is now collecting and displaying PQ data continously. 150 PQ monitors will have been installed by the end of the project all over the country and the PQ of the whole electricity transmission system will be monitored. Some measurement results obtained upto now are also presented in this paper.