Comparison of renewable/non-renewable power sources between countries

Visual Design
#1

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Guideline

Visual Design Type: Bubble Chart
Name of Tool: Tableau
Visual Mappings:
colour: red for unrenewable fuel source and green for renewable.
size: estimated power generated for a particular country.
label: country name.
Unique Observation: Most of the worlds energy comes from unrenewable fuel sources.
Data Preparation: Data is grouped by fuel type into renewable and unrenewable categories.

Source: http://datasets.wri.org/dataset/globalpowerplantdatabase

Question:
Does my visualisation make sense? Is the meaning of the size clear? Is there a better way of presenting a comparison of renewable/non-renewable power sources between countries?

#2

Hi,

The graph explains what you are trying to show quite nicely, with China dominating the market for renewable and non-renewable.

However, we are inherently bad at comparing circles. Maybe the circles can be ordered in size e.g. in a spiral?

Also it is understandable that China generates the most since it is such a big country, maybe you could show the data per capita rather than raw value. This can give a more fair comparison between countries.