For me: only the Aqara SmartOutlet (SP-EUC01/Zigbee) works natively within the Energy Service, showing PowerConsumption and cumulative stats. It also can be used with the EnergyService Automations and Reports.
Smartthings Outlets (Zigbee) do not work for me as well as the Aeotec Smart Switch 6 (Z-Wave).
Also working as a main energy measurement device is the poweropti by Powerfox, but I think this is limited to the german (-speaking) markets.
Aeotecs Energy Meter 5 worked within the Smartthings App for a short time for me, but I didnt get to test it within the Energy Service, because it generated to much wrong readings.
Aqara Plug is named “Schreibtisch” in these screenshots:
