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unless you somehow charge only during times of excess renewable energy. Currently, this is not possible.
This is possible in many European nations, who publish live data on renewal percentage.
In the Netherlands, I have the live green energy data in home assistant. This could quite easily be used to turn on and off car charging
What is ETL?
Their website doesn’t say, the hackernews comments don’t say. I could Google it but tbh this is on the people announcing their product to have not even said what it is properly