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Figaro wall plug exposes 3 MultiLevel Sensors:
NodeID-0-49-4 (Power W)
NodeID-0-50-0 (Energy kWh)
NodeID-0-50-2 (Energy W)

Not sure if this is a new issue of I just observed it recently, the endpoint X-0-50-2 is not refreshing in z-way. See attached picture.

Same is for my Fibaro WallPlug.
The wallplug does not send unsolicited W measurements from 0-50-2, so it's not refreshed, you should poll it to get update.
Anyway 0-50-2 is the same as 0-49-4 that is refreshed.

Just for your own safty...
In Sweden fibero: FGWPE/F-10 is forbidden on the swedish market:

The swedish electric alliance tested the device and found out that the product can start a fire.

[page in swedish, use google translate]
http://www.byggahus.se/el/skarvuttag-fi ... ingsforbud