Portal:Energy/Selected article
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The 1973 oil crisisbegan in earnest on October 17, 1973, when the members of Organization of Arab Petroleum Exporting Countriesannounced, as a result of the ongoing Yom Kippur War, that they would no longer ship petroleumto nations that had supported Israelin its conflict with Syriaand Egypt(i.e., to the United Statesand its allies in Western Europe).
About the same time, OPEC members agreed to use their leverage over the world price-setting mechanism for oil in order to quadruple world oil prices, after attempts at negotiation failed. Due to the dependence of the industrialized world on OPEC oil, these price increases were dramatically inflationary to the economies of the targeted countries, while at the same time suppressive of economic activity.
This increase in the price of oil had a dramatic effect on oil exporting nations, for the countries of the Middle East who had long been dominated by the industrial powers were seen to have acquired control of a vital commodity. The traditional flow of capital reversed as the oil exporting nations accumulated vast wealth. Meanwhile, the shock produced chaos in the West, and shares on the New York Stock Exchange lost $97 billion in value in six weeks. Read more...
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Photovoltaics, or PV for short, is a technology that converts light directly into electricity. Photovoltaics is also the field of study relating to this technology and there are many research institutes devoted to work on photovoltaics. Due to the growing need for solar energy, the manufacture of solar cells and solar photovoltaic array has expanded dramatically in recent years. Photovoltaic production has been doubling every two years, increasing by an average of 48 percent each year since 2002, making it the world’s fastest-growing energy technology. At the end of 2007, according to preliminary data, cumulative global production was 12,400 megawatts. Roughly 90% of this generating capacity consists of grid-tied electrical systems. Such installations may be ground-mounted (and sometimes integrated with farming and grazing) or building integrated. Financial incentives, such as preferential feed-in tariffs for solar-generated electricity and net metering, have supported solar PV installations in many countries including Germany, Japan, and the United States. Read more...
The internal combustion engine is widely used to power a great variety of vehicles and other devices. It is an engine in which the burning of a fuel occurs in a confined space called a combustion chamber. This exothermic reaction of a fuel with an oxidizer creates gases of high temperature and pressure, which are permitted to expand.
The defining feature of an internal combustion engine is that useful work is performed by the expanding hot gases acting directly to cause movement, for example by acting on pistons, rotors, or even by pressing on and moving the entire engine itself.
Internal combustion engines are most commonly used for mobile propulsion systems, where their high power-to-weight ratios, together with excellent fuel energy-density, are advantageous. They have appeared in almost all automobiles, motorbikes, many boats, and in a wide variety of aircraft and locomotives. Where very high power is required, such as jet aircraft, helicopters and large ships, they appear mostly in the form of gas turbines. They are also used for electric generators and by industry.
The most common fuels in use today are hydrocarbons derived from petroleum including diesel, gasoline and liquified petroleum gas. Most internal combustion engines designed for gasoline can run on natural gas or liquified petroleum gases without modifications except for the fuel delivery components. Liquid and gaseous biofuels, including ethanol and biodiesel can also be used, and trials of hydrogen fuel have been in progress for some years. Read more...
In 2004, the worldwide energy consumption of the human race was on average 15 terawatts (TW; 1 TW = 1 x 1012 W) with 86.5% from burning fossil fuels. This is equivalent to 471,000 PJ (1 PJ = 1 x 1015 J) per year. There is at least 10% uncertainty in these figures due to national variations in tracking consumption, and due to variations in energy content between particular barrels of oil or a tons of coal.
The remaining worldwide energy resources are large, with the remaining fossil fuels totaling an estimated 0.4 YJ (1 YJ = 1024 J) and the available nuclear fuel such as uranium exceeding 2.5 YJ (1 YJ = 1024 J). Mostly thanks to the Sun, the world also has a renewable usable energy flux that exceeds 120 PW (8,000 times 2004 total energy usage), or 3.8 YJ/yr, dwarfing all non-renewable resources.
Despite the abundance of fossil fuels there are a number of pressures that may move the world’s energy consumption to alternative energy sources. These include political considerations over energy security and potential pressure from energy superpowers, environmental concerns related to global warming and sustainability, and economic pressure resulting from energy price rises, carbon emissions trading and green taxation.
This move is already starting to happen in some countries, notably as a result of the Kyoto Protocol, and further steps in this direction are proposed. For example, the European Commission has proposed that the energy policy of the European Union should set a binding target of increasing the maximum level of renewable energy in the EU’s overall mix from less than 7% today to 20% by 2020. Read more...
Article 5 Fusion power refers to power generated by nuclear fusion reactions, which has the potential to be harnessed for electricity generation in the future. The Sun is one such example of a nuclear fusion reaction.
In a fusion reaction, two atomic nuclei fuse together, releasing energy. For this to happen an external source of energy is used to heat the atoms to form a plasma within a tokamak. The largest current experiment in fusion power, JET, uses slightly more power to create the plasma than it produces, and although it can generate an output of 16 MW it can only do so for a few seconds. The ITER reactor, announced in June 2005, is expected to produce several times more power than it uses, and to do so over a period of many minutes.
Most design studies for fusion power plants (with the exception of those using aneutronic fusion) involve using the fusion reactions to create heat, which is then used to operate a steam turbine, similar to most fossil fuel power plants and fission-driven nuclear power stations.
Compared to a fission reactor, the likelihood of loss of life from a catastrophic fusion reactor failure is much lower. The amount of fuel can only sustain the reaction for about a minute, and the reaction can only occur under very extreme conditions which would be rapidly disrupted if the reactor were damaged. Radioactive waste from a fusion reactor would also be dangerous for a much shorter timescale compared to the waste from fission reactors. Read more...
Hydroelectricity is electricity produced by hydropower. Hydroelectricity now supplies about 715,000 MWe or 19% of world electricity (16% in 2003). It is also the world's leading form of renewable energy, accounting for over 63% of the total in 2005. Although large hydroelectric installations generate most of the world's hydroelectricity, small hydro schemes are particularly popular in China.
Most hydroelectric power comes from the potential energy of dammed water driving a water turbine and generator. The energy extracted from water depends on the volume and on the difference in height between the source and the water's outflow. Pumped storage hydroelectricity schemes produce electricity to supply high peak demands by moving water between reservoirs at different elevations. They currently provide the only commercially important means of grid energy storage. At times of low electrical demand, excess generation capacity is used to pump water back into the higher reservoir, from where it can be released through the turbines at short notice. Less common types of hydroelectricity include run-of-the-river, waterwheels, and tidal power schemes.
A major advantage of hydroelectricity is the elimination of fuel costs and the associated carbon emissions although, in tropical regions, decaying plant material behind the dam can sometimes result in greater greenhouse gas emissions than a conventional power station. Other issues include the need to relocate people from areas to be flooded and disruption caused to aquatic ecosystems. Read more...
Wind power in Texas consists of many wind farms with a total installed capacity of 4,356 megawatts (MW) from over 40 different projects. Texas produces the most wind power of any U.S. state, followed by California with 2,438 MW. Wind energy accounts for 3.3% of all the energy used in the state and is growing, while large portions of wind energy produced in Texas also goes to markets in other states.
Several forces are working to the advantage of wind power in Texas: the wind resource in many areas of the state is very large, large projects are relatively easy to site, and the market price for electricity is relatively high because it is set by natural gas prices. The wind power industry is also creating many jobs and farmers may earn extra income by leasing their land to wind developers.
The Horse Hollow Wind Energy Center (735 MW) in Taylor and Nolan counties is the world's largest wind farm. Other large wind farms in Texas include: the Sweetwater Wind Farm, Buffalo Gap Wind Farm, King Mountain Wind Farm, Roscoe Wind Farm, Desert Sky Wind Farm, Wildorado Wind Ranch, and the Brazos Wind Farm. As of 2007, 942 MW of wind power is currently under construction in Texas. This expansion will help Texas meet its renewable energy goal of 5,000 new megawatts of power from renewable sources by 2015. Read more...
Article 8 The Energy policy of Russia is contained in an Energy Strategy document, which sets out policy for the period up to 2020. In 2000, the Russian government approved the main provisions of the Russian energy strategy to 2020, and in 2003 the new Russian energy strategy was confirmed by the government. The Energy Strategy document outlines several main priorities: an increase in energy efficiency, reduced impact on environment, sustainable development, energy development and technological development, as well as an improved effectiveness and competitiveness.
Russia, one of the world's two energy superpowers, is rich in natural energy resources. It has the largest known natural gas reserves of any state on earth, along with the second largest coal reserves, and the eighth largest oil reserves. Russia is the world fourth largest electricity producer after the USA, China, and Japan. Russia is the world’s leading net energy exporter, and a major supplier to the European Union.
Renewable energy in Russia is largely undeveloped although there is considerable potential for renewable energy use. Geothermal energy, which is used for heating and electricity production in some regions of the Northern Caucasus, and the Far East, is the most developed renewable energy source in Russia. Read more...
Global warming is the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation. Global average air temperature rose 0.74 ± 0.18 °C (1.3 ± 0.32 °F) during the past century. The Intergovernmental Panel on Climate Change concludes, 'most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations.'
The effects of global warming are expected to include sea level rise, floods, drought and changes in the frequency and intensity of extreme weather events. Other effects may include changes in agricultural yields, reduced summer streamflows, species extinctions and increases in the ranges of disease vectors.
Concentrations of greenhouse gases are now considerably higher than at any time during the last 650,000 years, the extent of the ice core record. It is believed that CO2 concentrations were last this high 20 million years ago. The primary international agreement on combating global warming is the Kyoto Protocol, which covers more than 160 countries and over 55% of global greenhouse gas emissions. The United States, the world's largest greenhouse gas emitter; Australia; and Kazakhstan have refused to ratify the treaty. China and India, two other large emitters, have ratified the treaty but are exempt from cutting emissions. International talks on a successor to the treaty, which ends in 2012, have begun. Read more...
Mitigation of global warming involves taking actions aimed at reducing the extent of global warming. This is in contrast to adaptation to global warming which involves minimizing the effects.
To avoid dangerous climate change, the energy policy of the European Union has set a 2 °C [3.6 °F] limit to the temperature rise, compared to pre-industrial levels. Of this, 0.8 °C has already taken place and another 0.5 °C is already committed. The 2 °C rise is associated with a carbon dioxide concentration of 400-500 ppm by volume; as of January 2007 it was 383 ppm by volume, and rising at 2 ppm annually. Unless significant action is taken soon the 2 °C limit is likely to be exceeded.
Strategies for moving to a low-carbon economy include development of new technologies; renewable energy; hybrid vehicles; fuel cells; zero-energy buildings; energy conservation; carbon taxes; enhancing natural carbon dioxide sinks; population control; and carbon capture and storage. Environmental groups also encourage individual-lifestyle and political action, as well as action by business.
The Kyoto Protocol, covering more than 160 countries and over 55% of global emissions provides an international mitigation framework. The United States, the world's largest greenhouse gas emitter; and Kazakhstan have refused to ratify the treaty. China and India, two other large emitters, have ratified the treaty but are exempt from cutting emissions. International talks on a successor to the treaty, which ends in 2012, have begun. Read more...
Nuclear power is the controlled use of nuclear reactions to release energy for work including propulsion for ships and submarines, and for the generation of electricity. Nuclear energy is produced by a controlled nuclear chain reaction and creates heat which is used to boil water, produce steam, and drive a turbines.
Nuclear power provides around 15.7% of the world's electricity, 57% of which is generated by the United States, France, and Japan. Nuclear energy policy differs between countries, and some countries have no active nuclear power stations, or have phased them out. The first nuclear generated electricity, used to power four 200-watt light bulbs, was produced at the EBR-I reactor near Arco, Idaho, in 1951. This was followed in 1954 by the first grid-connected plant (in the USSR), and in 1956 by the first commercial plant (in the United Kingdom).
During the last decades of the 20th century, concerns about nuclear waste, nuclear accidents, radiation and nuclear proliferation lead to an anti-nuclear movement. The 1979 Three Mile Island accident and the 1986 Chernobyl disaster also played a part in stopping new plants in many countries, while the economics of nuclear generation and of nuclear decommissioning have also been factors. Despite this, many countries including Japan, China and India have continued to remain active in developing nuclear power, while recent years have seen a renewal of interest in others, including Finland, France, the United States the United Kingdom. Germany, in contrast, will close its 19 nuclear plants by 2020, and is investing heavily in renewable energy instead. Read more...
Coal is a readily combustible black or brownish-black rock composed primarily of carbon and formed from plant remains. It is the world's largest single source of fuel for electricity generation, and its fastest growing energy source. It is also the world's largest source of carbon dioxide emissions, one of the key greenhouse gases that are believed to be the primary cause of global warming.
The use of coal dates back to the Bronze Age, but it was the Industrial Revolution that led to its large-scale use, as the steam engine took over from the water wheel. Today world coal consumption is about 5.3 billion tonnes annually, of which about 75% is used to produce electricity. The region including the China and India uses about 1.7 billion tonnes annually, forecast to exceed 2.7 billion tonnes by 2025. The United States consumes about 1.0 billion tons annually. Almost one-third of all coal used was supplied by China in 2005.
Coal mining causes a number of harmful effects, including the pollution of water sources by sulfuric acid caused by a chemical reaction between water and iron sulfide in the coal. In common with other fossil fuels, the burning coal produces carbon dioxide and nitrogen oxides. It also produces sulfur dioxide, the cause of acid rain. Coal contains traces of uranium, thorium, and other naturally-occurring radioactive isotopes which, due to the vast quantities of coal used, cause more radioactive contamination than nuclear power plants. To eliminate CO2 emissions from coal plants, carbon capture and storage technology has been proposed but has yet to be commercially used. Read more...
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Petroleum (crude oil) is a naturally occurring liquid fossil fuel found in rock formations in the Earth, consisting of a complex mixture of hydrocarbons of various lengths. Due to its high energy density, easy transportability and relative abundance, petroleum has become the world's most important source of energy since the mid 1950s. Most petroleum is used for producing and gasoline (petrol) and fuel oil, both important primary energy sources. Petroleum is also the raw material for many chemical products.
Most petroleum is extracted it from oil wells found in oil fields. Although it is also possible to extract petroleum from oil shale or tar sands, both of which are known to exist in large quantities, doing so at low cost and without impacting the environment remains a challenge. The first modern oil well was drilled in 1848 in Azerbaijan, but it was the introduction of the internal combustion engine in the early 20th century that provided the demand that has largely sustained the industry to this day. The top three oil producing countries are Saudi Arabia, Russia, and the United States.
Burning oil releases carbon dioxide into the atmosphere, one of the major greenhouse gases contributing to global warming. Bioethanol and biodiesel are already used to some extent as alternatives, notably in Brazil, as are hybrid electric vehicles. Trials using hydrogen fuel are also in progress. There are further concerns about security of supply, oil price rises and whether world oil production may reach a peak, before declining, as predicted by Hubbert peak theory. Read more...
Ethanol fuel in Brazil provides a ~22% ethanol blend used nationwide, plus 100% hydrous ethanol for four million cars. The Brazilian ethanol program provided nearly 700,000 jobs in 2003, and cut 1975–2002 oil imports by a cumulative undiscounted total of US$50 billion. Brazil gets more than 30% of its automobile fuels from sugar cane-based ethanol.
The Brazilian government provided three important initial drivers for the ethanol industry: guaranteed purchases by the state-owned oil company Petrobras, low-interest loans for agro-industrial ethanol firms, and fixed gasoline and ethanol prices where hydrous ethanol sold for 59% of the government-set gasoline price at the pump. These pump-primers have made ethanol production competitive yet unsubsidized.
In recent years, the Brazilian untaxed retail price of hydrous ethanol has been lower than that of gasoline per gallon. Approximately US$50 million has recently been allocated for research and projects focused on advancing the obtention of ethanol from sugarcane in São Paulo. Read more...
Energy development, providing for the world's future energy needs, currently faces great challenges. These include the growth of world population, in living standards, and of industrialization, the peaking of oil production, and the need to cut pollution and carbon emissions. In the absence of sufficient energy the world's entire industrialized infrastructure would collapse, and could lead to a Malthusian catastrophe.
Fossil fuels currently supply most of the world's energy. They have a relatively high energy density, are technically easy to exploit and, if the costs of pollution and subsidies are ignored, are relatively cheap. Their use does, however, cause global warming, acid rain, and other forms of pollution. Natural gas is considered least polluting, coal the most polluting. Non-conventional fossil fuels, such as oil shale could be used, but they may be significantly more polluting and costly to extract. New technologies such as carbon capture may cut fossil fuel pollution, so permitting their continued use, but would also increase their cost.
The use of alternative fuels and reactor designs means that shortages of nuclear power fuels are unlikely in the foreseeable future, although the economics are complex. Their use also raises concerns such as waste disposal and nuclear proliferation. Fusion power has the potential to avoid such problems in the long term. Until then renewable energy sources, from biofuels to wind farms or geothermal energy, are likely to gain greater importance; although the technology is improving rapidly they have so far received little investment compared to other energy sources. Read more...
Natural gas, often referred to as simply 'gas', is a gaseous fossil fuel consisting primarily of methane. Natural gas is found in oil fields, natural gas fields, and in coal beds (as coalbed methane). Before use as a fuel, natural gas undergoes extensive processing to remove almost all materials other than methane.
Natural gas is a major source of electricity generation, and particularly high efficiencies can be achieved through combining gas turbines with a steam turbine in combined cycle mode. Natural gas burns cleaner than other fossil fuels, producing about 30% less carbon dioxide than oil and about 45% less than coal, per unit of energy released. It is also expected that natural gas reserves will peak around 2030, some 20 years after peak oil production. Compressed natural gas is also used as a cleaner alternative to other automobile fuels such as gasoline (petrol) and diesel. Natural gas is also used domestically for cooking and for central heating.
The major difficulty in the use of natural gas is transportation and storage because of its low density. Pipeline transport is economical, but is impractical across oceans. Liquefied natural gas can be shipped in LNG carriers, however the required liquefaction facilities add to the cost. The practice of flaring gas released in the course of recovering petroleum, so adding to greenhouse gas emissions, is now illegal in many countries. Read more...
There are several Solar power plants in the Mojave Desert which supply power to the electricity grid. Solar Energy Generating Systems (SEGS) is the name given to nine solar power plants in the Mojave Desert which were built in the 1980s. These plants have a combined capacity of 354 megawatts (MW) making them the largest solar power installation in the world.[1] Nevada Solar One is a new solar thermal plant with a 64 MW generating capacity, located near Boulder City, Nevada. There are also plans to build other large solar plants in the Mojave Desert. The Mojave Solar Park will deliver 553 MW of solar thermal power when fully operational in 2011.
Insolation (solar radiation) in the Mojave Desert is among the best available in the United States, and some significant population centers are located in the area. This makes the Mojave Desert particularly suitable for solar power plants. These plants can generally be built in a few years because solar plants are built almost entirely with modular, readily available materials. Read more...
According to Hubbert peak theory, peak oil is the date when the peak of the world's production of conventional petroleum (crude oil) is reached. After this date the rate of production is forecast to enter terminal decline, following the bell-shaped curve predicted by the theory. Due to the world's high dependence on inexpensive oil, it is thought that severe price increases may result, with serious implications for the global economy.
Acceptance of peak oil is far from universal, and the only reliable way to identify its existence will be in retrospect. One alternative scenario is that global production will eventually follow an 'undulating plateau' for one or more decades before declining slowly.
Having accurately predicted the date of peak production in the US petroleum industry, which occurred in 1970, M. King Hubbert, who devised the theory, forecast that the world peak would occur in 1995 'if current trends continue'. Various subsequent predictions have been made as trends have fluctuated in the intervening years. Two milestones have passed, however. The peak of world oilfield discoveries occurred in 1965 and, due world population growth, production per capita peaked in 1979.
The effects of peak oil could be mitigated through conservation and switching to alternative fuels or non-conventional oil sources. Such changes would bring their own challenges, ranging from the need to development alternative technologies to potential increases in greenhouse gas emissions. Read more...
Climate Change 2007, the fourth report of the United Nations Intergovernmental Panel on Climate Change (IPCC) to evaluate the risks of global warming since 1990, is being published in sections throughout 2007. Prior to publishing, the report - which is the combined work of hundreds of experts - is reviewed by representatives from many of the world's governments.
Due to the accumulation of evidence, the report goes further than previous reports by stating that 'warming of the climate system is unequivocal'. It goes on to say that 'most of the observed increase in globally averaged temperatures since the mid-20th century is 'very likely' due to the observed increase in anthropogenic greenhouse gas concentrations'. Fossil fuel use is given as the primary source of the increase in atmospheric carbon dioxide, with the increase in methane being very likely caused by a combination of agricultural practices and fossil fuel use.
Based on an analysis of computer climate models, the report states that average surface temperatures will rise during this century, most likely between 1.1 to 4.3°C (5.2 to 11.5 °F), depending on the mitigation actions taken. Excluding the effects of ice sheet flow, they also predict a sea level rise of 18 to 26 cm (7 to 23 inches), more heat waves and more heavy rain. An increase in areas affected by droughts, in the intensity of tropical cyclones and in extreme high tides is also likely. The IPCC believe that stabilization of greenhouse gas concentrations is possible at a reasonable cost, with stabilization between 445 and 535 ppm costing less than 3% of global GDP. They do warn, however, that a 'large shift in the pattern of investment' is required. Read more...
Investors worldwide have paid much greater attention to the renewable energy industry in recent years. In many cases, this has translated into rapid renewable energy commercialization and considerable industry expansion. The wind power industry and photovoltaics (PV) industry provide good examples of this. Leading renewable energy companies include Acciona, Enercon, Gamesa, GE Energy, Q-Cells, Sharp Solar, SunOpta, and Vestas. Read more...
Oil shales are fine-grained sedimentary rocks containing significant traces of kerogen (a solid mixture of organic chemical compounds) that have not been buried for sufficient time to produce conventional fossil fuels. When heated to a sufficiently high temperature, a vapor is driven off which can be distilled to yield 'shale oil', a form of non-conventional oil which may become a future alternative to crude oil. Oil shale can also be burnt directly as a low-grade fuel for electricity generation and heating.
The modern shale oil industry began in France in 1837. World shale oil production reached a peak of 46 million tons in 1980 before falling to about 16 million tons in 2000, due to the high cost of production relative to petroleum. Oil shales are currently used in Estonia, Brazil, China, Germany and Russia. While some countries have ended their use, several other are considering it for electricity generation, either alone or in combination with coal. World deposits are estimated at 2.9-3.3 trillion barrels of recoverable oil, 0.75-2.6 trillion barrels of which are in the United States, with significant deposits in a further 32 countries.
Environmentalists have expressed high levels of concern over the extraction of shale oil, and protests appear to have contributed to the halting of the developing industry in Australia. Surface-mining has all the detrimental environmental impacts of open-pit mining, and the combustion and thermal processing generate considerable waste material and harmful atmospheric emissions. Emissions of carbon dioxide, a major greenhouse gas, are significantly higher than those generated by conventional oil production. A report for the European Union warns that 'increasing public concern about the adverse consequences of global warming may lead to opposition to oil shale development'. Read more...
Renewable energy in Iceland has supplied over 70% of Iceland's primary energy needs since 1999 - proportionally more than any other country - and 99.9% of Iceland's electricity is generated from hydroelectricity and geothermal power. In 1998 the Icelandic Parliament committed to convert the national vehicle and fishing fleets to hydrogen fuel produced from renewable energy by 2050. This would make Iceland the first completely energy-independent country in the world to use 100% renewable energy sources.
Iceland's location on the Mid-Atlantic Ridge makes it one of the most tectonically active places in the world, with over 200 volcanoes and over 20 high-temperature steam fields. Geothermal energy for heating was first used in 1907 when a farmer piped steam from a hot spring into his house. In 1930, the first pipeline was constructed in Reykjavík, heating two schools, 60 homes, and the main hospital. In 1943, the first geothermal district heating company started. Geothermal power now heats 89% of the nation's houses, provides around 19% of electricity generation and over 54% of primary energy. The first hydroelectric plant was built in 1904 and produced 9 kW of power. Hydropower now provides 81% of Iceland's electricity supply.
Imported oil provides most of Iceland's remaining energy. Replacing this with hydrogen was first suggested after the 1970s oil crises, but the idea was not adopted until 1998. Iceland's small size makes it ideal for testing the viability of hydrogen as a fuel source for the future, while the plentiful renewable energy sources can be harnessed for its production. Iceland participates in international hydrogen fuel research and development programs, and many countries are following the nation's progress.
As a result of its transition to renewable energy, Iceland is ranked 53rd in the list of countries by carbon dioxide emissions per capita in 2003, emitting 62% less than the United States despite using more primary energy per capita. Read more...
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