The two graphs show the main sources of energy in the USA in the 1980s and the 1990s.

The pie charts illustrate the main sources of energy in the United States during the 1980s and 1990s.

Throughout both decades, oil remained the predominant energy source; however, its share declined alongside coal, while nuclear power’s contribution increased significantly.

In 1980, oil accounted for 42% of the total energy supply, making it the largest source. Natural gas was the second most important, providing 26%, followed by coal at just over 20%. Hydroelectric power and nuclear power each contributed 5%.

By 1990, nuclear power had doubled its share to 10%, becoming a more prominent energy source. Hydroelectric power remained stable at 5%. Coal and natural gas saw only minor fluctuations, maintaining similar proportions to the previous decade. Conversely, oil usage decreased to 33%, a drop of nearly 10 percentage points, but it still held the largest share of energy consumption.