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In this paper, a general description of the innovative Enel Distribuzione (ED) power quality data warehouse (PQDW) is carried out; moreover, its application fields will be described, with respect to the synergy with the other ED network's management systems in the new smart grids perspective. The analysis of the MV network power quality (PQ) performances is important not only to verify the network's compliance with the standard EN 50160, but also to evaluate its correlation with the basic network's operating information (protections tripping, MV neutral point operating status etc.) provided by the network's remote control and automation systems. The PQDW is available through the Enel intranet, by means of an user-friendly web based interface, thus making exploitable the row data recorded by the power quality instruments (PQI), located in more of 500 installations. In Italy, ED PQDW is the best practice of PQ management systems, combining research and operational issues.