The so called “SmartThings Energy” is a service that aggregates energy from different supported devices and display statistics, trends, prices, etc. For that you need that SmartThings approved the device and, yeah, for whatever reason Tapo P110M via the cloud is approved, Tapo P110M via Matter is not. Others like Eve Energy or GRILLPLATS are approved.
But that does not mean Matter devices with energy monitoring are not supported by SmartThings, that same Tapo P110M via Matter will display the power and energy (and with my custom driver voltage and current) just fine and you can create automations with the power, etc. But it won’t appear in the fancy graphs or stats of “SmartThings Energy”.

