What is it that you can't grasp about the energy wholesale market in the UK? It matters not what the source be renewables fossil or nuclear, they are all traded at the same prices. Not on what it costs to generate. What is a bit rich is that EDF froze their pricing to French domestic customers while at the same time increasing UK customers pricing, and now the UK are selling energy to France who have a shortfall. If you were in that business market would you turn a blind eye at making money?