Portal:Renewable energy

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Burbo Bank Offshore Wind Farm, at the entrance to the River Mersey in North West England.

Renewable energy is generally defined as energy that comes from resources which are naturally replenished on a human timescale such as sunlight, wind, rain, tides, waves and geothermal heat. Renewable energy replaces conventional fuels in four distinct areas: electricity generation, hot water/space heating, motor fuels, and rural (off-grid) energy services.

Based on REN21's 2014 report, renewables contributed 19 percent to our energy consumption and 22 percent to our electricity generation in 2012 and 2013, respectively. Both, modern renewables, such as hydro, wind, solar and biofuels, as well as traditional biomass, contributed in about equal parts to the global energy supply. Worldwide investments in renewable technologies amounted to more than US$ 214 billion in 2013, with countries like China and the United States heavily investing in wind, hydro, solar and biofuels.

Renewable energy resources exist over wide geographical areas, in contrast to other energy sources, which are concentrated in a limited number of countries. Rapid deployment of renewable energy and energy efficiency is resulting in significant energy security, climate change mitigation, and economic benefits. In international public opinion surveys there is strong support for promoting renewable sources such as solar power and wind power. At the national level, at least 30 nations around the world already have renewable energy contributing more than 20 percent of energy supply. National renewable energy markets are projected to continue to grow strongly in the coming decade and beyond.

While many renewable energy projects are large-scale, renewable technologies are also suited to rural and remote areas and developing countries, where energy is often crucial in human development. United Nations' Secretary-General Ban Ki-moon has said that renewable energy has the ability to lift the poorest nations to new levels of prosperity.

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Wind power has become a significant energy source within South Australia over the past decade. As of August 2014, there was an installed capacity of 1,473 MW, which accounts for 27 per cent of electricity production in the state. This represents around half of the nation's installed wind power capacity. The rapid growth of wind power in South Australia has enabled the state to achieve its target of sourcing 20% of electricity from renewable energy sources three years ahead of schedule.

The development of wind power capacity in South Australia has been encouraged by a number of factors. These include the Australian Government's Mandatory Renewable Energy Target, which require electricity retailers to source a proportion of energy from renewable sources, incentives from the South Australian Government including a supportive regulatory regime and a payroll tax rebate scheme for large scale renewable energy developments. Also the state's proximity to the Roaring forties means there are high quality wind resources for wind farms to exploit. In mid-2009, RenewablesSA was established by the South Australian Government to encourage further investment in renewable energy to the state.

The load factor (or capacity factor) for South Australian wind farms is usually in the range 32-38%. This means that a wind farm could typically produce between 32 and 38% of its nameplate capacity averaged over a year.

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Hans-Josef Fell (born 7 January 1952 in Hammelburg) is a member of the Green Party in the German Parliament. Fell framed the German Renewable Energy legislation, together with Hermann Scheer. He currently serves as spokesman on energy for the Alliance 90/The Greens parliamentary group.

Fell has travelled to many countries to discuss clean energy. Following his visit to Turkey, plans for a nuclear power plant at Akkuyu were stopped, and Prime Minister Bülent Ecevit declared that his government would foster renewable technologies. In Taiwan, following Fell's television appearances and talks with individual policy makers, the government announced the withdrawal of its plans to build the country's fourth nuclear power plant, and its intent to phase out nuclear power by 2020. The French government has also shown great interest in drafting a renewable energy law similar to the one in Germany.

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... that efficient energy use is most often achieved by adopting a more efficient technology or production process ? Energy efficient buildings, industrial processes and transportation could reduce the world's energy needs in 2050 by one third, and help controlling global emissions of greenhouse gases, according to the International Energy Agency. Energy efficiency and renewable energy are said to be the twin pillars of sustainable energy policy.

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Quotations

  •  "Ethanol creates U.S. jobs, cleans the air, strengthens national security – and best of all, it is here right now. Every day, ethanol producers are developing technological improvements to increase efficiency, reduce water use, and boost the amount of energy derived from corn kernels or from cellulosic biomass. Ethanol is not a 'someday' fuel. It is the renewable, clean-burning alternative we have to gasoline today."
"Moreover, advancements in ethanol production are quickly opening the door for the commercialization of cellulosic ethanol and other advanced biofuels."

Ethanol is Here Today Renewable Energy World, 19 August 2010.

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