The table below gives details of world electricity production by renewable sources in the four years between 2009 and 2012.

The given table provides some information on the

amount

of electricity generated by five

sources

including Geothermal,

Wind

, Solar, Hydraulic and

Bio-mass

across the globe over a four-year

period

. Looking at the

overall

perspective, it is apparent that the Hydraulic source generated the highest

amount

of energy among the other

sources

, which accounted for more than 80% of the total energy production.

Moreover

, all

sources

witnessed an upward trend throughout the given

period

. In terms of evaluation of

sources

, the electricity produced by the Hydraulic method

,

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was thirteen times that

of

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generated by

Bio-mass

and

Wind

sources

.

In other words

, Hydraulic

sources

started at 3329

TWh

in 2009

and

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after which

this

amount

went up to 3514 and 3530 in 2010 and 2011, respectively.

At the end

of the studied

period

,

this

amount

peaked at 3663.

Although

both

Bio-mass

and

Wind

started the production of energy at a similar value at 246 and 276, the

wind

was a more fast-growing source so

this

source generated more than 535

TWH

in 2012 as opposed to the

Bio-mass

at 326

TWh

. Other

sources

,

such

as Geothermal and Solar, were ranked

the

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fourth and fifth. The generated

amount

of electricity by Geothermal had no significant change over the

period

, whilst the other one started at 21

TWh

and produced 104

TWh

in 2012.