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Low cost Zigbee GU10s via Ikea (UK)
(www.ikea.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
The aqara plugs do have power monitoring but afaik it's borked with ZHA unless you write your own quirks file....