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Traditionally web-based technology is not used in power plant automation and SCADA systems due to its several limitations to an advanced user interfaces. In power plant automation and SCADA (supervisory control and data acquisition) systems real-time monitoring and operational reliability requirements are high. Typically automation and SCADA systems handle critical tasks in the power production and distribution process. Controlling, operating and monitoring the process effectively set higher quality requirements to the user interface compared to common web page. Different web based technologies are reviewed and analyzed within the scope of this paper from Automation and SCADA system point of view. An evaluation of suitability of the web user interface technology is performed in respect to the Power Plant Automation and SCADA Systems HMI (human machine interface). This research paper also highlights the state-of-the-art implementations of several web-based control displays that are used as the base of technical solutions for the power plant system vendors.