Gantt chart showing change in the types of power plants being commissioned

This gantt chart shows how the type of power plants being commissioned changed over the time period of 1896 to 2018. This is not specific to a certain country, it encompasses most countries.
This visualisation was created using the ‘global_power_plant_database’ dataset.

To aid in the creation of this visualisation I used the ’ Many Eyes: A Site for Visualization at Internet Scale’ paper.

I would like your professional opinion on my visualisation:

  1. Could the colour palette be improved?
    2.Would it be more visually appealing if the data points where further away from each other?