The generic term "renewable energy" covers a broad variety of industries that meet final energy need...

1. Have you thought about the question what is renewal energy
and how it's useful for the environment ?
The generic term "renewable energy" covers a broad variety of industries that meet final energy
needs themselves diverse: direct heat, fuel, fuel, electricity. this is a set of inexhaustible energy
sources on a human scale, mostly from solar activity, but which are manifested in very different
physical phenomena.
Photon energy: solar energy, which comes from the flow of solar photons on the earth's surface.
Mechanical energy: wind, water gravity, energy of tidal currents or waves created from the wind.
Thermal energy: geothermal energy which operates the heat flow that comes from the deep layers of
the earth, ocean thermal energy that exploits the differences in temperature between the surface
and the deep layers of the tropical seas.
Combustion energy: a fuel or renewable fuel called biomass derived organic matter (plants, trees,
animal waste, etc.), itself made from the sun by photosynthesis carbon.
all these sources can also developed in to energy immediately useful to man through "energy
pathways". every sector takes advantage of one of the above mentioned phenomena through the
transformation method to attain a form of energy directly usable by man to satisfy his needs heat,
electricity or fuel, the energy companies called final energy. the notion of sector as a result covers
both the source of energy but in addition the end it is required to satisfy.
this {concept similarly applies to fossil fuels. when one has such oil, a powerhouse quickly
transportable and storable, we can both easily supply heat, electricity or fuel. for renewable energy,
the specific creep, favorite applications appear, practical impossibilities as well coming restrict the
ability to employ these energies. certainly, these energies are not constantly at our disposal
(intermittent, weather, etc.), they're dispersed and generally not transportable in their real form,
with the notable exception of the wood. in many cases, must be used at the very place where they
happen, while population concentrations can find remote.
Whereas oil had accustomed us to assume just in primary energy needs (the number of tons of oil
needed for complete energy balance all uses of a country such as France), it's required to quantify
the contribution of renewable energy balance, going into detail and from the description of local
needs. solar thermal (solar collectors), geothermal and biomass click here for more info in its
countless forms are click here well suited to meet the requirements of low-temperature heat
encountered in housing, services and industry. Biomass and, much more seldom, solar concentration
under are to domestic cooking applications.
Just practically biomass is well suited to significant temperature applications in industry where it
can replace coal.
regarding off-grid electricity, there is an effective balance between the demands and photovoltaics
for power applications under 1 kW wind, a few kW to fifty kilowatts, biomass and small hydro from
tens of kW to several MW. only the latter two sectors can prevent an energy storage form of
electricity as it can, in both cases, work a minimum of water storage or fuel biomass.
For the past electricity on the grid, large hydro, tidal, solar thermodynamic (concentrating solar

2. power plants), solar photovoltaic, wind, high temperature geothermal and various biomass sectors
are well placed. the boundaries to this match result from fluctuating aspect of the resource
(primarily solar and wind) which results in compatibility issues with the electricity grid.
The dispersion of the resource normally leads to favor decentralized production, using smaller units,
connected or not with distribution networks. this attribute, usually presented as a considerable
difficulty to the development of renewable sectors (we don't benefit from scale effects) may be offset
by the effects of serial and opportunities entailed countless cogeneration proximity to users:
electricity from biomass and heat, heat cogeneration fuel, etc., with the development of the general
energy efficiency of the energy process that can be expected.