Ekaros is correct. Lots of people pay a fixed cost for their electricity whether it is generated at peak time with lots of gas or in the middle of the night with wind and nuclear.

We don't currently do a good job of responding to price signals. We have some plans to expand this, which are being rushed into service after being neglected for a long time.

https://www.bbc.co.uk/news/business-61949246

And even that has to lie about "it not being about rationing" because price signals are so foreign to the consumer energy market.