If you've chosen to go to a fast charger, you're always going to get a charge and you'll just pay what it costs. That's not going to change. But for a destinat

If you've chosen to go to a fast charger, you're always going to get a charge and you'll just pay what it costs. That's not going to change. But for a destination charger (e.g. shopping center), or a charger at home or work, it doesn't have to be like that. I would have a system where there's three options (can be three big light up buttons) - 1. I need the battery charged right now, 2. I'd like the battery charged over the next 6 hours, and 3. I have enough charge for now, but do charge me up if it's free or prices are negative. Option 2 would probably be the default, because it would be able to modulate the demand and charge very cheaply, because it'd mostly only have to avoid the two-hour or so peak periods (like the solar duck curve). Option 1 is there when you need it, but you might pay a few dollars more for a charge. During the day in summer, in areas with lots of solar (like my state in Australia) you might be able to always select Option 3, and usually get a full charge (well, I'd set the 80% limit but fully up to there) every time without ever paying anything. It doesn't have to be hard - you just tell it you want charge right now, over the next little while, or you don't care, and you pay (or don't pay) a differently depending on what you select. It can be a very small number of super simple and extremely intuitive options, not complex settings you need to think about. People scare-monger about "Governments taking away our ability to use power when we want", but it's actually going to be "Utilities will offer incentives like free electricity if you choose to shift your usage" - just offering more options, not taking away freedoms.