"Power density" of different power plants

Question:
So after some playing around with the dataset, I’ve noticed that there is quite a large number of solar and wind plants but in the grand scheme of things, they barely contribute towards the energy grid, so I was wondering if there would be a good way to show that aspect of the data off? Bellow is my attempt.
Image:


Name of Tool: Tableau
Dataset: Global Power Plant Database
Country: Worldwide
Year: 2014
Visual Mappings: Size is mapped to the number of that specific type of plant, colour is the total power generation for that plant type.