Renewable energy represents energy that is generated from natural sources and is thus naturally replenished or constantly renewed. These include energy related to wind, sunlight, water, biomass and geothermal (heat).
CO˛ concentration over the earth’s surface due to
running of fossil fuel operated power houses, steady
rate of global warming causing thaw in the Arctic
region, increased emission of greenhouse gases together
with high oil prices have made governments offer
incentives as well tax credits to people using renewable
or alternative from of energy. The new US President
Barack Hussein Obama have already declared, “Any company
that’s willing to invest in clean energy will have an
all the available renewable energies harnessed so far
for generation of electricity, wind energy appears to be
progressing at the highest rate (30% annually) with
globally installed capacity of well over 100GW. And in
this, the European nations have taken the lion’s share
in these ventures, followed by the
Renewable wind energy is commonly used now for generating electricity through wind turbines. Perched atop high towers at suitable places where wind current is usually strong, the turbine blades rotate in a fairly high revolution, thereby generating electricity through a generator coupled to the turbine’s drive shaft. Although it usually produces DC voltage, it is eventually converted to 120V AC for general use. The turbine’s output line is often connected to battery banks where the generated current is stored for use as and when needed. Turbines may be small or big. Smaller ones are usually meant for home electricity generation while larger turbines provide higher outputs in Wind Farms that often supply power to the grid.
solar energy is also used for generating electricity
through photovoltaic solar cells. The silicon particles
within the cell release the electrons, thereby
generating electricity. Several PV cells are connected
together to form a solar panel that creates electricity
to supplement the grid power in average homes. This type
energy technology often proves beneficial to
isolated off-grid and remote areas. Amazingly enough,
Renewable water energy is also utilized for generating electricity through hydroelectric power generation system where huge mass of water kept in large dams or natural reservoirs are allowed to cascade down on hydro-turbines from a considerable height. The generated electricity is transmitted to national grids and then allowed to be distributed freely to consumers.
Renewable geothermal energy is utilized for generating current too but the initial expenses for starting one is fairly expensive. It is primarily obtained by tapping the heat of the mother earth by going deep down into the earth’s depth (up to several kilometers). However, the operating costs involved are rather low.
As for use of renewable energy from biomass, solid biomass is generally used directly as a combustible fuel, creating 10-20 MJ/kg heat. Dairy farmers often used cow dung to produce biogas that is used for heating and lighting of farms and buildings.
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