Power companies that wants to invest a billion dollars in power generation will also invest into fossil fueled power delivery. Solar and wind produce a lot of cheap energy when the weather is optimal, but when the weather change and demand exceeds supply, the market price of energy goes to the roof. Last winter in Europe we saw prices spikes well over 100x of what the average market cost, which primarily went pay for fossil fueled power generation. Fossil fueled power delivery also get a lot of subsidizes in order to provide reserve energy, so they get the advantage of being paid twice.

Solar and wind is excellent investment for those wanting to compete when supply in the grid is high and prices are low. Nuclear, hydro, storage and fossil fuels are there to compete with supply is low and prices high.