I have a very homebrew solution.
I use a currentcost clamp (like this one) which sends current usage update every 6 seconds on 433mhz.
I then use a USB-DVB dongle and rtl_433 to receive and decode the 433mhz. I created a hassio addon to send mqtt messages with the usage.
IIRC currentcost also supports per-socket monitor, too but I never used one.
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