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Buildings are important contributors to energy consumption accounting for around one-third of energy consumed in cities, where large public buildings are the dominant energy consumers and energy consumption might be significantly decreased through Building Energy Management Systems (BEMS). KT has developed SG-BEMS (Smart Grid Building Energy Management System) solution to reduce building energy usage, costs and carbon emissions, and installed on smart grid test bed in Jeju Island recently. The paper first introduce the architecture of SG-BEMS including its function and then presents the effectiveness of next generation monitoring, analysis, and control functions. This building energy efficiency solution based on smart grid expected to be a critical part of the future smart grid.