[rcxdude]

Electricity prices are set by the marginal producer, which in the UK a lot of the time means gas turbines which are expensive to run. Which mainly means that the renewables plants are making money hand over fist, creating a big push to create more. It's only once that percentage grows enough that the price pressure will go downwards in general. (currently the UK is roughly an even split between gas turbines, nuclear/biomass, and renewables). You can already take advantage of the low price of renewables in some cases, though, if you have a flexible tariff and electricity demand (like a water heater, a house battery, or charging an EV), by drawing when the gas turbines are not necessary to meet demand.