The line graph illustrates the amounts of electricity generated from four sources—coal, nuclear power, natural gas, and water power—along with the total from all sources—in the United States from December 2007 to November 2008.
Overall, the total electricity generation from the four sources remained stable across the given period, despite experiencing mild fluctuations. Notably, electricity generated from coal stood out with consistently higher numbers throughout the period, while water power contributed the least to electricity production in the U.S.A.
In December 2007, the amount of total electricity produced from all sources accounted for 350 terawatt-hours; this was followed by significant growth to a staggering 400 terawatt-hours in July 2008. Despite this increase, the total figure for electricity production decreased gradually, ultimately falling to 300 terawatt-hours in November 2008. In December 2007, the amount of electricity generated from coal made up 170 terawatt-hours; however, in July 2008, electricity from coal increased slightly to 200 terawatt-hours, making it the highest electricity production throughout the period.
In contrast, starting at 170 terawatt-hours in December 2007, electricity generated from natural gas remained stable until May 2008. However, from May 2008 onward, the figure showed a slight improvement, reaching 100 terawatt-hours. Finally, the electricity produced from nuclear and hydropower made up 70 and 20 terawatt-hours, respectively, in the first period, and remained stable at those initial levels until the end of the period.