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Wave power is the transport of energy by ocean surface waves, and
the capture of that energy to do useful work, for example, electricity
generation, water desalination, or the pumping of water (into
reservoirs). Machinery able to

exploit wave power is generally
known as a wave energy
converter (WEC).

In 2008 the first
experimental wave farm 2,25
MW was opened in Portugal.
Such farm is composed of

B tandem connection of large-
A
tonnage cylinders , that
oscillates on sea waves.
G
Oscillation of these cylinders (
Figure 5.15 A and B as shown on fig5.15)
cause to move electric generator

G.
Geothermal energy is an alternative energy source, although it is
not resourceful enough to replace more than a minor amount of future'

energy needs. Geothermal energy is obtained from the internal heat of
the planet and can be used to generate steam to run a steam turbine.
This in turn generates electricity, which is a very useful form of energy.
The radius of the Earth is about 6370 kilometres , with an internal

core temperature of about 4000 degrees Celsius at the centre. The
mantle surrounds the outer core and is only about 72 kilometres below
the surface, depending on location. The temperature at the mantle-

surface crust boundary is about 375 degrees, Celsius.
So, how does this help us? It turns out that if we drill down only 4,5
kilometres we can reach temperatures of 100 degrees Celsius, which is
enough to boil wate rand to run a steam-powered electric power plant.

In 2010, the United States led the world in geothermal electricity
production with 3,086 MW of installed capacity from 77 power plants.[
The largest group of geothermal power plants in the world is located at

The Geysers, a geothermal field in California. The Philippines is the
second highest producer, with 1,904 MW of capacity online.
Geothermal power makes up approximately 18 % of Philippine

electricity generation.

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