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Wind Power
Wind
power is the conversion of wind
energy into a useful form, such as
electricity, using
wind turbines.
At the end of 2008, worldwide
nameplate
capacity of wind-powered
generators was 120.8
gigawatts.[1]
Although wind produces only about
1.5% of worldwide electricity use,[1]
it is growing rapidly, having
doubled in the three years between
2005 and 2008. In several countries
it has achieved relatively high
levels of penetration, accounting
for approximately 19% of electricity
production in
Denmark,
10% in
Spain
and
Portugal,
and 7% in
Germany
and the
Republic of
Ireland in 2008.
Wind
energy has historically been used
directly to propel
sailing ships
or converted into mechanical energy
for pumping water or grinding grain,
but the principal application of
wind power today is the generation
of electricity. Large scale
wind farms
are typically connected to the local
electric power
transmission network,
with smaller turbines being used to
provide electricity to isolated
locations. Utility companies
increasingly
buy back
surplus electricity
produced by small domestic turbines.
Wind energy as a power source is
favoured by many
environmentalists as an
alternative to
fossil fuels,
as it is plentiful,
renewable,
widely distributed, clean, and
produces lower
greenhouse gas
emissions, although the
construction of wind farms is not
universally welcomed due to their
visual impact and other
effects on the
environment. The
intermittency
of wind seldom creates problems when
using wind power to supply a low
proportion of total demand. Where
wind is to be used for a moderate
fraction of demand, additional costs
for compensation of intermittency
are considered to be modest.[2]From Wikipedia, the free
encyclopedia
