The energy management system application program interface(EMS-API) standard IEC 61970 enables the seamless integration of the application software with the energy management system. However, there is no common information model(CIM) for distributed generation system in the IEC 61970 standard. The original CIM in IEC 61970 standard is expanded to incorporate the photovoltaic power generation system, wind power generation system, fuel cell generation system as well as stored energy system. The integrated grid information model including distributed generation systems is implemented in the design of micro-grid energy management system.