Hi @joepacker99,
Those are some interesting observations you’ve made from the visualisation! Now to answer your questions…
Firstly, yes, the larger green circles plotted on the map combined with the bubble diagram underneath make it clear that most of France’s energy generation comes from nuclear.
Secondly, the colours chosen are mostly representative of the fuel type and therefore quite intuitive (e.g. grey for coal and yellow for solar). Perhaps a blue or grey would have been more appropriate for wind than orange, but I understand that those colours have been used elsewhere and reusing them may cause more confusion. Maybe consider using white?
Hope this helps 
Ben