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 350TWhs initially, – a figure that later increased slightly to around 360TWhs on Jan-08. This was followed by a considerable fall to just 300TWhs by Apr-08 before rebounding markedly to a peak of roughly 400TWhs on Jul-08, which later experienced a significant decrease to just over 300TWhs by Nov-08.
In terms of coal and nuclear gas, it can be seen that the amount of electricity produced from coal accounted for about 170TWhs in December 2007, after which declined marginally to roughly 150TWhs on Apr-08. It then grew moderately to just under 200TWhs on Jul-08 before declining significantly to around 150TWhs by the end of the year. A similar pattern was seen in natural gas, which remained stable at around 70TWhs for six months initially and then rose temporary to roughly 100TWhs on Aug-08 before felling swiftly to approximately 50TWhs 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 generated about 70TWhs throughout the period, while the latter recorded merely 20TWhs over the period.