@MarkCarline They just have outdated information:

• Home Assistant supports it since version 2024.10, it was even explicitly announced (won't let me link it) that you could use smart plugs with Matter 1.3 energy monitoring in the energy dashboard and they tested the feature with another brand.
• SmartThings, also in early October, updated the stock Edge drivers that handle Matter smart plugs to account for the standard power measurement attribute of Matter 1.3. For anyone interested the source code is here and you can see it subscribes to the ActivePower attribute and exposes the value to the platform to use in the user interface or automations.

These two platforms expose the energy data to the user and if Tapo launched the firmware update it would work as expected in them.

Then there are platforms that internally support it but only for developers, like Google Home for instance. The platform is certified for Matter 1.3 and the Google Home API supports the active power attribute, but it is not exposed to the user and cannot be used in automations either until they create a user interface for that and add support in the automation engine.

  @Wayne-TP this holding back because of home assistant is seriously, seriously short sighted. Home assistant is an open source community, and can't develop support for something without a device that exposes the right attributes. (No one has access to pre-release hardware

i guarantee you, the nanosecond you release firmware, someone will update to support.

  @Cammm agree 10000%  We could have a bug report / development request open within minutes ;)

@Wayne-TP Happy to test

@Cammm Mind that Matter energy reporting is a standard: there's no development needed for Tapo to support specific smart home platforms or support in smart home platforms for specific vendors like Tapo. It would be very very wrong if Home Assistant or SmartThings had to add specific code for Tapo when they support the standard.

The active power reporting attribute is perfectly defined in Matter spec and it's so simple: it's just the measurement in milliwatts. It's the same subscription mechanism used to report the brightness level of a bulb or the temperature of a sensor. The only care needed by Tapo is being a bit smart when emitting a report so it's meaningful and fast when a change in power consumption happens and doesn't flood the Matter controller with reports when the power hasn't changed much.

Also, again, both SmartThings and Home Assistant do support it so it should work as long as they comply with the standard.