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Matter 1.3 is here to help get your smart home energy usage under control
(www.androidpolice.com)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
@c10l EVE’s Energy have been providing energy metering under Matter for the last few months.
Ok, it was a HA specific solution.