This research is to investigate the performance analysis of turbine for power generation with three different numbers of the nozzle vane in the turbine. Velocity, pressure. and temperature distributions of fluid over the flow domain of the turbine are numerically calculated for the optimum design of nozzle with two different rotational speeds of the turbine blade (1000 and 1500 RPM). Ultimately, the energy-efficient and maximum power-generated shape of the nozzle vane are determined through three different maximum Mach number of the flow with three shapes of the nozzle vane (10, 18, and 24 EA).