计算机化能源管理系统（EMS）正在越来越多的新建和现有商业建筑中安装。虽然它们的主要功能是控制建筑系统以节约能源和电力，但其中许多系统也能够监控建筑系统和能源使用。本文采用案例研究的方法，评估了加州两栋建筑中EMS的监测能力。检索到的数据包括历史每小时需求量和室外空气温度，以及瞬时状态或累计运行时间- 每个最终用途的时间数据。

Computerized Energy Management Systems (EMSs) are being installed in un increasing number of new and existing commercial buildings. While their primary function is to control building systems to save energy and power, many of these systems are also capable of monitoring the building systems and energy use. Using a case study approach, this paper evaluates the monitoring capabilities of the EMSs in two buildings in California. The retrieved data include historical hourly demand and outdoor air temperature, along with either instantaneous status or accumulated run-time data for each end use.We found that an EMS, in order to monitor building energy performance, must reliably measure parameters that yield energy consumption information (end-use demand is most useful) and store this information long enough so that it can be retrieved. In many cases, minor additions to the hardware and software of an EMS could greatly enhance its monitoring capabilities.Units: Dual