@Wayne-TP yes indeed. Home Assistant already supported Matter 1.3 (since June 2024) and so once the Tapo P110M firmware was upgraded, I re-paired then with the Home Assistant Matter controller and energy outputs appeared! 

There was a serious limitation was though, I could not update the Tapo P110M firmware OTA with Home Assistant, it said 1.0.0 was the latest. I had to resort to resetting the P110M, pairing using the Tapo app to upgrade the firmware, then re-pairing P110M with the Home Assistant Matter controller. That worked but is sub-optimal, because it means we can't use this Matter product without the proprietary Tapo app. @Wayne-TP is that something that could be improved in the future?

I wanted to say how much I've loving the TP-Link Matter products, apart from the P110M I have a bunch of the bulbs. I avoided TP-Link stuff before because it was proprietary cloud stuff. But with Matter products and ONVIF cameras, I'm buying a lot more Tapo stuff. I hope TP-Link will upgrade more products to Matter, like the power boards. Eventually I hope you'll implement Thread, because I'm not going to add 200 WiFi devices just to have Smart Lighting! A mesh network like Thread or Zigbee is a must!

Before upgrade (1.0.0) and after upgrade (1.3.0) below:

After resetting the Tapo P110M, upgrading the firmware with Tapo app, then re-pairing with Home Assistance Matter controller, the energy info immediately became available.

DoinitSideways wrote

so likely been running and counting just not reporting.

@DoinitSideways Yes, the plug stores the total energy (since the last factory reset I guess, haven't looked into that). It reported it via their proprietary protocol for the Tapo app and vendor-specific integrations, now it reports it with standard Matter 1.3 attributes.

By the way, there is a missing feature in the P110M via Matter, the power-on behaviour on start up. Tapo is aware because I told them in reddit, but the Matter attribute named "StartUpOnOff" to configure that behaviour is not implemented.

I was waiting for it to pop up in Home Assistant, but no such luck. Installed the Tapo app, added the devices and they updated immediately.

re interview in HASS and the power info is up and running.

it would appear it has always been counting, the counter has started at a random

number, so likely been running and counting just not reporting.

  @mgguinne 

I can confirm this information. Update available in my tapo app. Updating via tapo app right now. After update in HA, reread device and voilaaaaa ! 😁

UK plug got it

MarkCarline wrote

I have all 45x of my plugs

@MarkCarline I got the update already, I'm really curious about the performance of your SmartThings hub with 45 plugs reporting attributes every 10 seconds which is the rate Tapo went for instead of doing a smart reporting. For power and energy only that would be 540 reports per minute in total (45 x 2 x 6), or 1080 if you use my driver that also displays the voltage and current and updates at the same rate. That's between 9 and 18 reports per second in your case.

Edit: Fixed calculations, although that would be the worst case scenario with all plugs on and an active load in each.

Springrbua wrote

So "Voltage" and "Current" are missing from Tapo.

@Springrbua Actually the problem is that Home Assistant is not displaying it. Tapo reports the voltage and current through Matter using the "RMS Current" and "RMS Voltage" attributes, which are the mandatory attributes for devices of its category. The problem is that Home Assistant only displays the attributes "Voltage" and "Active Current", which are optional but other vendors use.

I've also received the update, it seems to report power every 10 seconds regardless of the load, so no smart reporting like reporting meaningful changes fast or not reporting similar values.

Also, they do not support Matter Power-on state (StartUpOnOff attribute) to set the state after a power loss, the only way to configure it is through Tapo app. Other vendors like WiZ or Eve support setting that behaviour through Matter.

They do not support the On With Timed Off command either, which is a native auto-off timer for Matter that can be restarted. Smart home platforms usually don't expose that feature but my custom driver for SmartThings does.

My Tapo P110M also got the update today and after reinterviewing them in Home Assistant, they show "Power", "Energy" and "Exported Energy".
I recently also bought some Meross Matter Plugs which show "Power", "Energy", "Voltage" and "Current". So "Voltage" and "Current" are missing from Tapo, while Meross does not have "Exported energy". I don't need any of this entities so for me both plugs are good.

What I don't like about this plugs (both Meross and Tapo) is, that they still somehow require the manufacturers app. For Meross I had to create an account and register their plugs to get Matter 1.3 update. In the manuals they even "advertise" that their app is still needed, which in my opionion is a disadvantage, not something to be proud of...
For Tapo I am not sure if they have to be registered to receive the update, since auto update seems to be enabled by default.

  @PapaMaku 

 No idea. Just found it was for mine and happy as I can now delete the home assistant integrations.