The given pie charts illustrate the comparison of the proportion of energy capacity from various sources in gigawatts (GW) in the year of 2015 with the prediction for 2040.
Overall, fossil fuel had highest capacity in 2015 and solar has lowest, while in 2040, fossil fuels are expected to remain the largest source and the proportion of nuclear will decline eventually.
To commence with, in 2015, the total energy capacity was 6.688 GW. The majority of the capacity, 64%, came from fossil fuels. The second largest source was wind, accounting 23%. The remaining capacity was supplied by nuclear (6%), wind (5%), and solar being the smallest proportion (2%).
On the other hand, the forecast for 2040 shows a considerable increase in total capacity to 11.678GW. Fossil fuels are still predicted to be the main source, but their percentage is expected to decline significantly to 44%. In contrast, solar power is projected to see the dramatic growth, increasing to 18%. The wind is expected to be double, reaching 12%. The contribution from other renewables are forecast to rise rapidly to 21%, while nuclear power is predicted to remain at 5%.