This is a System Level Use Case which describes high level interaction among energy management systems (EMS) within an Area EPS. These EMS’s include scheduling and power system operations within the Area EPS, called Web_trader/PSO, and a Smart Grid energy management system, called μEMS. This use case describes cooperative control between the Smart Grid and the Area EPS. This use case also describes interaction between μEMS and the PV/Load Forecasting system and Smart House. Interaction within the PV/Load Forecasting system and Smart House are described in Local Level Use Cases, respectively.