I find this a great representation of relationships between primary and secondary fuel. I like how it there is an overall graph along with one that is individual.
But I do have some suggestions
Individual graphs
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Maybe it might be best to make the individual ones also have the same scale so it can be easily compared to one and another. For example Oil and Petcoke at first glance can be seen to have similar maximum value but that is not the case.
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Also, have the same secondary fuel labels on the outer ring as the overall graph. It will make it easier to compare the overall one to individual. For example, Oil in the overall graph has a different shape to the individual one. And since the secondary fuel labels are in different places for individual ones, it can be hard to see how two or more actually overlap.
Overall graph
- The colour in my opinion is a bit chaotic. They are overlapping with one and another quite a bit, but this can be hard to fix. Maybe there are better colour choices that can show the differences.
Further information extraction
- It might be interesting to see if a powerplant has renewable energy source as their primary, is it also the case that their secondary fuel source is also renewable? Or vice versa for non-renewable.
But overall, I really like the design idea you went for. Its nice to see the relationships of primary and secondary fuel.