Categorising point layer twice by size and form in QGIS

Question

I have data points from a CSV-file that I opened in QGIS.
The points illustrate different power plants of solar, wind, geothermal, coal, oil, etc with different capacities within each class.
I already categorized the symbols by opening the Layer Properties...> Categorized and selected the value I wanted to categorize. In this case, I first wanted to be able to distinguish which type of power plant it is. Each type has a different color.
However, I would also like to categorize such points by the energy capacity of each plant. For this, I would like to change the size of the points if their capacity falls within a range.
How can this be done in QGIS?

MrXsquared · Accepted Answer

You can use data defined size override for this:

Click on the symbol in your categorized renderer:

Click on data defined override for size and choose the assistant:

Choose your source and load the values. Adjust the settings if you like and confirm them:

Done for the first part. Now you can also set up a data defined size legend. Click on advanced on the bottom right and choose data defined size legend:

Choose your legend type, settings, etc:

Result:

Categorising point layer twice by size and form in QGIS

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