Well dynamic pricing only ever works until you have a power outage in the winter and suddenly you pay a years worth of money for the 1 hour you could use your fridge, during a snowstorm.

It’s still capped at £1/kWh, which is a lot but also a price I’ve seen maybe for a few slots on a couple days in the last three years.

The price was known ~1 day in advance so I had the choice to fill up the battery with cheaper (but still high) prices overnight and reduce the impact

That is the trade off for renewables. Power is very expensive when needed and very cheap when not.

Electric power is very expensive when demand is greater than supply, very cheap when supply is greater than demand.

One property of electric power grids is that supply exactly equals demand.

That's what batteries are for.

Consumer pricing in the UK is regulated with a price cap (per kWh), so consumers can't be fleeced in an unexpected event.

Business energy users aren't protected, so they buy long-term contracts, hedge, or go-under in the event of an unforeseen energy-shortage.

Where’s profitable crypto mining when you need it?

Back yard plasma furnace? Artificial diamond making? Aluminum smelting?

Even just a large water tank which you can choose when to add heat.

https://en.wikipedia.org/wiki/Seasonal_thermal_energy_storag...

You need something that's valuable, energy intensive, easy to stop and start, and cheap to build capacity for. Either or both of those last two tend to be the problem for most industrial processes (and also crypto mining).

There are may different energy storage systems.

https://en.wikipedia.org/wiki/Energy_storage

There have wildly different prices for unit of stored energy and wildly different storage times.

https://css.umich.edu/publications/factsheets/energy/us-grid...

It's not cost effective run aluminum smelting only during peak electricity production.