1)How SCADA is different from any older version OS when the latter looks easier to operate? 2)How to down/ up grade steam turbine MW generated?

1.The term SCADA (Supervisory Control and Data Acquisition) usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas (anything from an industrial plant to a nation). Most control actions are performed automatically by RTUs or by PLCs.