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Eve Energy smart plugs transmit Energy information via Matter
(eventfrontier.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
It looks like it got added in the protocol V1.3 and then further refined in 1.4: https://csa-iot.org/newsroom/matter-1-4-enables-more-capable-smart-homes/
Yep just saw that too after I researched it a bit more. What is strange is I don't remember Eve Energy having a firmware update since then. Makes me wonder if they had it ready to go in previous firmware versions based on internal specs they saw? Or maybe I just forgot about a firmware update I did.