Tibber even does it super easily for normies — you connect your EV account to it and it takes control of the charging rate such that your car is ready to go the next morning, but charges it during the cheapest periods (which generally are the greenest ones, when there's a sudden influx of solar or wind). AFAIK this even works if you're not on a dynamic pricing contract, you just obviously wouldn't get the price benefit.

Personally, I also got Home Assistant set up to remote start my large appliances in exactly the best moment to make use of the most green energy. Probably doesn't make a massive impact, but it doesn't cost me much either.