The table gives details of world electricity production by renewable

The table illustrates the

amount

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of 4 kinds of renewable

electricity

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production in the world between 2009 and 2012.

Overall

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, 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

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the table, hydraulic has generated by far the largest

amount

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of

electricity

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for 4 years.

For example

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

whereas

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solar generates only 21 watts in 2009.

However

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, the

amount

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of

electricity

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

also

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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.

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hydraulics remains the most common source of

electricity

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, they both generate a similar

amount

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with 276.4 and 246.8 respectively in 2009.

Although

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the

amount

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of

electricity

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