Tags: The United States, Energy Statistics
Sources: U.S. Energy Information Administration. (2015): Monthly Energy Review March 2015
List Notes: Data is top 5 primary sources of energy in the United States in Btu for the year 2014. Percentage of total is for all forms of energy produced in the United States and not just for the five shown. Btu is a traditional unit of energy equal to about 1055 joules. It is the amount of energy needed to cool or heat one pound of water by one degree Fahrenheit.