The upgrade of a full-scope simulator for fossil-fuel power plants is presented. The mathematical models of a control board simulator have been re-hosted on a new simulation environment based on Windows XP. In order to improve the simulator capacities, the turbine model and the turbine control model are replaced by models with a wider scope. The turbine model is based on physical laws and has an application range from cold iron up to full-load generation and shutdown operations. On the other hand, the turbine control model is based on the main features of modern electrohydraulic controls and has a full application range too. This simulator has been extensively tested during steadies and transient states and its response has been validated with regard to data plant by the instructors of a training center for power plant operators.