The line graph gives information about how much electricity was generated from four different energy sources – coal, nuclear power, natural gas, and water power – in the USA from December 2007 to November 2008.
Overall, the amount of electricity produced from coal and natural gas declined slightly at the end of the period, while the figure for nuclear power and water power remained relatively stable, resulting in a decrease in total energy production. It is notable that while the electricity production levels were the highest for coal, the opposite was true for water power.
Regarding all energy sources, the quantity of electricity generated from all energy sources recorded roughly 350 TWh initially, a figure that later increased slightly to around 360 TWh in Jan-08. This was followed by a considerable fall to just 300 TWh by Apr-08 before rebounding markedly to a peak of roughly 400 TWh in Jul-08, which later experienced a significant decrease to just over 300 TWh by Nov-08.
In terms of coal and natural gas, it can be seen that the amount of electricity produced from coal accounted for about 170 TWh in December 2007, after which it declined marginally to roughly 150 TWh in Apr-08. It then grew moderately to just under 200 TWh in Jul-08 before declining significantly to around 150 TWh by the end of the year. A similar pattern was seen in natural gas, which remained stable at around 70 TWh for six months initially and then rose temporarily to roughly 100 TWh in Aug-08 before falling swiftly to approximately 50 TWh by Nov-08 in 2008.
As for the remaining energy sources, a period of stability was seen in the amount of electricity generated from nuclear power and water power, with the former generating about 70 TWh throughout the period, while the latter recorded merely 20 TWh over the period.