Power-system simulator is considered an essential tool for design, operation, and control of electrical power systems. The nature of power-system enforces its simulation into sophisticated mathematical models and matrix calculations. Consequently, several research efforts were directed to develop numerical techniques that include efficient mathematical methods for various power system problems. Along with these developments, valuable research efforts are directed to developed efficient single-line diagram visualization, these efforts emphasize many beneficial software aspects such as reusability and extendibility of the developed applications. On this context, several endeavors are oriented for Web-based powersystem simulation. This paper introduces a Web-based application designed to provide flexible, reliable and extendable power system simulator topology. The developed application brings together the features of Web and desktop applications together. The proposed application deploys Microsoft's ActiveX technology using Microsoft foundation classes (MFC). The graphical user interface is implemented using HTML and Java Script which has been linked to the developed ActiveX control. The developed application presents a valuable tool for power system simulation through the WEB keeping into consideration features of the desktop applications.