I have an energy monitor and Home Assistant — it’s pretty neat, and I can verify that the energy usage is essentially the same on both. Helps to pinpoint electricity drains, as I can tell what breaker is using the juice (the smart plugs are also helpful here).

I went with the Emporia Vue2 which unfortunately requires some tinkering to get it to run local-only, but once I set that up it’s been a dream. Too bad they don’t offer it out of the box configured for local use…