Just saw an interesting post over on the TPLink forum from an admin, see link:
https://community.tp-link.com/en/smart-home/forum/topic/672228?replyId=1439494
The interesting part of what they mention are these bits:
Based on the information we currently have, there is no platform that supports energy monitoring functionality under the Matter 1.3 standard yet.
and
We have noticed that some users have mentioned that Home Assistant now supports Matter 1.3. However, as we have learned, Home Assistant has only upgraded to the Matter 1.3 SDK development framework, which allows other developers to create Matter 1.3 functionalities on the platform. They’ve not yet implemented the specific plug power monitoring feature included in the Matter 1.3 standard. The new device types and advanced features defined in the Matter 1.3 standard will need to be gradually adapted based on demand.
So i wonder - based on the latter quote, is there more work HA need to do to enable this power monitoring spec?