The two pie charts illustrate the proportion of global energy capacity in gigawatts in 2015 and the projected figures for 2040.
In 2015, the total energy capacity was 6,688 GW, of which fossil fuels accounted for the largest share at 64%. Nuclear energy made up almost a quarter, at 23%, while solar and wind contributed 6% and 5% respectively. Other renewable sources represented only 2% of the total.
By 2040, the overall capacity is expected to rise significantly to 11,678 GW. Although fossil fuels will remain the main source, their proportion is predicted to fall to 44%, a notable drop of 20 percentage points. Nuclear power will slightly decrease to 21%. In contrast, renewable sources are projected to grow considerably. Solar energy is expected to nearly triple, reaching 18%, while wind power will more than double to 12%. Other renewables will also see a modest increase to 5%.
Overall, while fossil fuels are predicted to continue dominating the global energy mix, there will be a clear shift towards renewable sources such as solar and wind by 2040.