There are a few potential energy sources that are available but remain undeveloped in many areas of the country as users remain complacent about the availability of non-renewable sources of energy. Oil is one of the largest current sources of fuel being used around the world and is being used to power cars, trucks and industry with natural gas a close second in the amount of energy used. While being used for over 100 years, there are other potential energy sources that are being overlooked.