The two pie charts illustrate the proportion of energy capacity, measured in gigawatts (GW), in 2015 and projected for 2040. Overall, while fossil fuels are expected to remain the dominant source, their share will decline substantially, whereas renewable sources, particularly solar and wind, will see remarkable growth.
In 2015, the total energy capacity stood at 6.688 GW, the majority of which – nearly two-thirds (64%) – was generated from fossil fuels. Other renewables represented the second-largest category at 23%, while nuclear, wind, and solar contributed relatively minor shares of 6%, 5%, and 2% respectively.
By 2040, total capacity is forecast to increase considerably to 11.678 GW. Although fossil fuels will still account for the largest portion, their share is predicted to fall sharply to 44%. The most dramatic expansion is anticipated in solar power, which will rise nearly nine-fold to 18%. Wind power is also projected to more than double, reaching 12%. Other renewables will dip slightly in proportional terms to 21%, though their absolute capacity will grow. Nuclear energy, by contrast, will remain marginal, edging down to 5%.
To summarise, the data highlight a clear transition towards a more diversified energy mix, with substantial gains in solar and wind offsetting a declining reliance on fossil fuels. This indicates a significant global shift towards sustainable energy sources by 2040.