From your Remote Manager account select the Device Manager menu item, followed by XBee Networks tab.   Highlight the desired entry and click on Properties, followed by the Smart Energy tab.

Click the + sign in front of the desired  Endpoint (value) Metering Device entry for the desired ERT meter endpoint  to expand the clusters.  

Click the + sign in front of the Input (Server) Clusters item to expand the input clusters.  

Click the + sign in front of the Cluster 0x702 -Simple Metering item. Click on the first attribute: Attribute 0x0 (UInt48).

To the right of the screen, click on Read Attribute to display the most current meter reading.