It’s all about the price of gas used to fire up power stations to supplement nuclear and wind capacity. This is called marginal pricing. It is a market place for times gone by. It needs changing.

What is marginal pricing and the “merit order”?

Marginal pricing refers to electricity prices being set by the variable cost of the marginal plant, i.e. the most expensive plant that is required to serve demand. This is the way electricity prices are determined on short-term wholesale markets, such as the day-ahead market.

All generators receive and all consumers pay the same price. A uniform price however and at what cost it was produced.

This is an interesting site that explains how it works. https://neon.energy/marginal-pricing