The table gives details of world electricity production by renewable

The table illustrates the

amount

of 4 kinds of renewable

electricity

production in the world between 2009 and 2012.

Overall

, there is a trend of increase in all types of power sources by different degrees. Hydraulic is the most reliable source of energy throughout the whole examined period.

According to

the table, hydraulic has generated by far the largest

amount

of

electricity

for 4 years.

For example

, more than 3000 watts of power is produced by hydraulic from 2009 to 2012

whereas

solar generates only 21 watts in 2009.

However

, the

amount

of

electricity

produced by solar rise dramatically as it reaches 104.5 in 2012. It is

also

interesting to note that solar supersedes geothermal which produces 70.4 in the same year. Regarding wind and bio-mass, they are the second or third dependable sources of power.

While

hydraulics remains the most common source of

electricity

, they both generate a similar

amount

with 276.4 and 246.8 respectively in 2009.

Although

the

amount

of

electricity

by the former jumped to 534 in 2012, the change is less significant in the latter with 326.2.