Hydroelectric energy diagram

The diagram shows the consumption of renewable energy in the USA from 1949-2008.

Write a 150-word report for a university lecturer identifying the main trends and making comparisons where relevant.

» You should write at least 150 words.

Sample Answer 1:
The given pie chart presents the consumption as well as sources of different forms of renewable energy in USA from 1949 to 2008. In overall the total energy consumed in different forms show rose with many fluctuations during this period. If we see the graph in detail, we can categorize the data in two groups.

First group includes hydroelectric power and wood energy consumption. We can see that rate of energy consumed by hydroelectric power is higher as compare to wood energy. In 1949 both energy lines touch almost the same rate of consumption, which over years pass through many ups and downs and in 2008 again match the values with the difference of around point-one per cent.

Second group comprises bio-fuels and wind energy. Both lines show almost same trend of stability between 1949 and 1980 and then sharp rise afterwards. In 2008 grading, the consumption of bio fuels was little higher than the wind energy.

To summarize all above information, we can say that hydroelectric power was the most popular source of energy and wind power was the least. The trend of all energy forms is increased overall but in an irregular manner. Another interesting thing can be noticed that consumption of [W]wind and bio fuels remains at zero level between 1949 and 1980.

(Approximately 216 words | by Humairah Farooq)

Sample Answer 2:
The given line graph shows the main sources through which renewable energy is produced in USA and also tells about its total consumption from 1949 to 2008.

Water and wood have been the main means of producing energy. Initially from 1950 to 1960 the energy provided by them has approximately been same being 2 Quadrillion BTU, but from 1960 to 1980, the production of hydroelectric power doubled than fuel provided by wood. This increased trend of making energy through water is consistent with the total energy usage. The generation of energy through biofuels and wind was introduced in 1980. Since then, they have made a contribution of less than 1 Quadrillion BTU in production of total energy. Yet this is a significant contribution as the overall consumption of energy increased in subsequent years reaching up to a maximum of 7 Quadrillion BTU by 2008. It just dipped in 2000 because hydroelectric power also decreased during this time, but then they both rose again.

The changing trends in gross energy consumption are consistent with the generation of hydroelectric power signifying it as the major source of energy production. Wood has been the second most important source, while biofuels and wind made little contributions.