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Utilities need to reduce costs associated to maintenance of installed equipment. Main ways to achieve this cost reduction are the use of remote access to on-line condition monitoring of equipment, and a shift from preventive maintenance to predictive maintenance. Thanks to the evolution of monitoring systems, maintenance and operation people can concentrate their activity on tasks with high added value. Ethernet can transport the information from the substation to every PC connected to the customer intranet. This paper describes advanced solutions already implemented covering all type of primary equipment in the substation. Starting from the strict point of view of monitoring it will then proceeds forward with the presentation of diagnostics, prognosis and the challenges posed by the development of such tools. Integration into customer information system will be also discussed. As a last step, we will cast a look on future developments such as complete on-line services.