The two pie charts compare the proportions of energy capacity produced from different sources in 2015 and the predicted figures for 2040, measured in gigawatts (GW).
Overall, fossil fuels accounted for the largest share in 2015, but their proportion is expected to decrease significantly by 2040. At the same time, renewable energy sources, especially solar and wind power, are predicted to grow considerably. In addition, the total energy capacity is projected to increase from 6.688 GW to 11.678 GW.
In 2015, fossil fuels dominated energy production, making up 64% of the total capacity. Other renewables were the second largest source at 23%. In contrast, wind and nuclear energy contributed relatively small proportions, at 5% and 6% respectively, while solar power had the smallest share at only 2%.
By 2040, the share of fossil fuels is expected to fall to 44%. Solar energy is predicted to rise dramatically to 18%, becoming one of the major sources. Wind power is also projected to grow to 12%. Meanwhile, other renewables will remain relatively stable, slightly decreasing to 21%, and nuclear energy will fall marginally to 5%.
In summary, renewable energy sources are expected to become much more important in the future energy mix.