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What is renewable energy?

Essentially the term renewable energy refers to energy that occurs naturally and continuously in the environment.

The technologies that harvest these naturally occurring sources of power fall into several basic categories and within each category there are differing approaches to maximise their usage.

The main benefits are that renewable energy sources limit or eliminate harmful greenhouse gases.
Under the Kyoto Agreement the government is committed to changing the UK energy mix with a target of around 40% of electricity generation to come from renewable energy sources by 2020 to meet our international commitments.

Renewable energy falls into a number of basic technologies with variations in each area.

Solar Power, Wind, Marine, Biomass, Heat Pumps, Energy from Waste and Hydro Power.

Solar Power is by far the Earth's most available energy source, easily capable of providing many times the total current energy demand. It is the conversion of sunlight into electricity by the use of photovoltaic panels. Although not as popular in the UK compared to that of other sunnier nations, solar power has one huge advantage in that it utilises the greatest source of energy in our solar system – the sun.

Wind Power is the conversion of wind energy into a useful form, such as electricity, using wind turbines. At the end of 2008, the worldwide capacity of wind-powered generators was 121.2 gigawatts (GW).Wind power produces about 1.5% of worldwide electricity use, and is growing rapidly, having doubled in the three years between 2005 and 2008.

Marine Energy divides into 2 main areas:
Tidal Poweris a form of renewable energy that converts the energy of tides into electricity or other useful forms of power. Although not yet widely used, tidal power has potential for future electricity generation.

Wave Power refers to the energy of ocean surface waves and the capture of that energy to produce electricity.

Biomass,as a renewable energy source, refers to living and recently dead biological material that can be used as fuel or for industrial production.

A Heat Pump is a machine or device that moves heat from one location to another. Most heat pump technology moves heat from a low temperature heat source to a higher temperature heat sink. Heat pumps can be thought of as a heat engine which is operating in reverse. Most commonly, heat pumps draw heat from the air or from the ground. Some air-source heat pumps do not work as well when temperatures fall below around Most commonly, heat pumps draw heat from the air or from the ground.

Some air-source heat pumps do not work as well when temperatures fall below around −5°C(23°F).

Hydro Power (Hydroelectricity) is electricity generated by hydropower, i.e., the production of power through use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy. Once a hydroelectric complex is constructed, the project produces no direct waste, and has a considerably lower output level of the greenhouse gas carbon dioxide (CO2) than fossil fuel powered energy pla