The present document defines the current position of the ISG OEU members in relation to the so-called Global Key Performance Indicator (Global KPI) enabling the monitoring of ICT node (DC) energy management. Following Group Specification GS OEU 001 [2] the present document defines Global Key Performance Indicators in relation to energy management for all kinds of operator sites (OS) (e.g. transmission nodes@ central offices) and addresses the following objectives: ? energy consumption; ? task efficiency; ? energy reuse; ? renewable energy. The present document defines: ? four KPIs addressing these objectives (Objective KPIs); ? one Global KPI which combines the four Objective KPIs. The Objective and Global KPIs defined here apply to data centres or operator sites of any size from initial operation to end of life.