In my country (Denmark) there is a principal that the last producer to deliver the needed energy sets the price for all…
Every day, all producers set there price for the next day and expected power supply, for many renewables this is close to zero. They can do this as if any fossil fuel is needed they get a much higher price, but they get that price to… On the other hand, if you are to expensive and not part of the supply you get nothing, same if the renewables are able to cover and all put in zero for the asking price…
Then your provider is trading for the amount he need on a energy exchange ie for the Nordic countries that is Nord Pool, your provider has committed to only buy renewables thus limiting him where to trade. Most places still have more than demanded renewables for trade, this is typically measured over a longer period ie a year, giving acces to grid stable energy outside of sun and wind
But regardless that you buy renewables certified, what you get in the plug is still grid mix as it is impossible to separate the different sources without pulling 100 different cables to every house
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