Lets understand sources for the energy we use.In the US, the energy is produced mainly from resources such as petroleum, natural gas, coal, nuclear, and renewable.
Petroleum is accounted for 31% of energy production. While 25% of energy is come from natural gases, coal contributes 21% of energy.
However, the US depend on nuclear resources for producing 9% of energy. Similarly 8% of energy is generated from renewable sources.