The two pie charts compare the share of energy capacity, measured in gigawatts (GW), present in the year 2015 and the prediction for the year 2040. Overall, the total energy capacity between the two time frames is predicted to almost double, from 6.688 GW (2015) to 11.678 GW (2040). There are five main categories contributing to the energy capacity; of these, fossil fuels take up the largest percentage in both years, whereas nuclear energy is the least stored energy.
Going into detail, in 2015, 64% of the total energy capacity was taken up by fossil fuels, followed by 23% taken up by other renewable energy sources. The predicted percentage of fossil fuels decreased significantly, from 64% to 44%, while only a slight variation was present with other renewable energy sources, decreasing to 21%. However, the percentage of nuclear energy is drastically low compared to its non-renewable energy counterpart; it only takes up 6% of 6.688 GW, and it is also predicted to decrease by merely 1% twenty-five years later.
On the other hand, most common renewable energy sources take up very small percentages compared to others, standing at 2% for solar energy and 5% for wind energy. Despite these figures in 2015, they are expected to increase exceptionally, from 2% to 18% and from 5% to 12%.
Thus, it can be concluded that although there are some noticeable changes in both fossil fuel energy and solar energy reserves, the other forms of energy sources will remain relatively similar in the future.