Instead there would be electric relay connected to mains in your home and when there is less supply than demand you would get blackout. That would be similar comparison to this.
People would install a battery at home the way most of the world installs solar and they’d see massive reductions in electricity bills more than paying for the battery. The UK is absolutely terrible location for solar, and it’s still installed because UK’s electricity prices are so high.
That said, wind going to absolutely zero nationwide is extremely unlikely but the more people who signed up for such a system eventually just a little power wouldn’t be enough for all of them. So there’s be an economic feedback loop.
That said with a battery and dynamic prices, there are many days where you can charge a battery when the prices are low and use them battery when the prices are high.
Hedges like this are a useful risk mitigation strategy as going bankrupt is a much larger downside than making slightly more money.
So the consumer does not gain anything.
Wholesale prices are really just one aspect of grid manufacturing and paying them doesn’t mean you’re getting the equivalent of a percentage of wind farm productivity.
Tesco doesn't care if the freezers in store run at 04:00-04:15, or 04:30-04:45, and will pick whichever is cheaper.