This thesis describes the development of a web application that displays energy consumption in a company that produces stone aggregates, concrete and asphalt mixtures. The developed web application offers a solution to cluttered data collection of energy consumption and alleviates calculating the costs linked to energy consumption. In the introduction we present the background of the problem, and the given requirements. In the main part of the thesis we describe the new open-source framework ASP.NET Core in which the application was developed. This framework enables the developers to build and run web applications in different operating systems. Several tested JavaScript libraries were used for the frontend. Technologies used in the development of the web application are then followed by the description of the development process, use cases and evaluation of the completed work. By using a systematic development in the described technologies we built a responsive, adaptable and extendable application with a long-term support. We concluded with an analysis of the presented work. The application is currently still in testing and it will be installed in working environment in the near future. That part is a matter of a further refinements between developer and user.
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