The energy company I’m with in the UK offers this type of dynamic pricing. I’m not on that tariff, but the setup is a great idea.
The pitch is that they give you notice , sometimes half hour sometimes more, of price shifts. Then you can chose to maybe do you laundry later or sooner depending what’s going to be better. One of their use cases is even to have a rig where an electric car battery can supply energy to the house. You charge your car when power is cheap / free, run your home from the car’s battery when it gets high.
They even have an API that some people use to automate tasks to take advantage of the price shifts.
Done well it’s excellent, but definitely needs an ethical mindset behind it. Fortunately in the UK, Octopus Energy is nothing if not ethical, but they are very much notable by this difference!
That’s my point.. we already could charge many devices from the chargers we had