Solar Generators

Renewables

Renewables

energy renewables in the world at the end of 2006.

Renewable energy is energy generated from resources natural, such as sunlight, wind, rain, tides and geothermal heat – which are renewable (naturally replenished). In 2006, approximately 18% of global consumption of final energy from renewable sources, with 13% coming from traditional biomass such as wood-burning.Hydroelectricity has was the next largest source of renewable energy, with 3% (15% of global electricity generaiton), followed by hot water solar heating, which contributed 1.3%. Modern technologies, such as geothermal power from wind energy, solar and ocean energy together provided some 0.8% of final energy consumption.

change concerns climate, coupled with high oil prices, peak oil and increasing government support are behind most legislation renewable energy incentives and commercialization.European Union leaders reached an agreement in principle in March 2007 that 20 percent of the energy their country should be produced from renewable fuels by 2020, as part of its efforts to reduce emissions of carbon dioxide, placed issue in the context of global warming. The capital investment in renewable energy rose from 80 billion dollars in 2005 to a record 100 billion dollars in 2006.

In response to the G8's call on the IEA for "advice on how to achieve a future clean, clever and competitive energy, "the IEA said that replacing the current technology of renewable energy could Emmis reduce CO2 by 50% by 2050, which they claim is crucial, because current policies are unsustainable.

Wind energy is growing at a rate of 30 percent per year, with a worldwide installed capacity of over 100 GW and is widely used in several European countries and the United States. Manufacturing output of the photovoltaics industry reached more than 2,000 MW in 2006, and Photovoltaic (PV) power are particularly popular in Germany. Solar thermal power stations operate in the United States and Spain, and most of it is the plant of 354 MW SEGS the Mojave Desert. The world's largest geothermal power facility is Gevsers California with a nominal capacity of 750 MW. Brazil has one of the largest renewable energy programs in the world, involving production of ethanol fuel from sugar cane and ethanol now provides 18 percent of fuel in the country. Ethanol fuel is also widely available in the United States.

While there are many large-scale renewable energy projects and production, renewable technologies are also suitable for small off-grid applications, sometimes in rural and remote areas, where energy is often crucial in the development human. Kenya has the world's highest participation rate of households with some 30,000 solar small (20-100 watt) Solar Systems sold per year.

Some renewable energy technologies are criticized for being intermittent or unsightly, but the market is growing for many forms of energy renewable.

Main renewable energy technologies

Three sources of energy

The majority of renewable energy technologies are directly or indirectly powered by the sun. The Earth-atmosphere system is in equilibrium such that heat radiation into space is equal to incident solar radiation, the resulting level of energy in the system Earth-atmosphere can be roughly described as the Earth climate. The hydrosphere (water) absorbs a significant fraction of radiation incident. Most of the radiation are absorbed at low latitudes around the equator, but this energy is dissipated in the world in the form winds and ocean currents. wave action may play a role in the process of transferring mechanical energy between the atmosphere and ocean by wind stress. Solar Energy is also responsible for the distribution of precipitation which is operated by hydroelectric projects, and the growth of plants used to create biofuels.

Renewable energy flows involve natural phenomena such as sunlight, wind, tides and geothermal heat, as the International Energy Agency, said:

"Energy from renewable natural processes that are replenished constantly. In its various forms, it follows directly from the sun, or heat generated deep earth. Included in the definition of electricity and heat generated by solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels and hydrogen from renewable resources. "

Each of these sources unique characteristics that influence how and where they are used.

Wind

Vestas V80 wind turbines

Airflow can be used to run turbines. Modern wind turbines range from around 600 kW to 5 MW of rated power, although turbines with rated output of 1.5-3 MW have become the most common for commercial use, power turbine is a function of the cube of wind speed to wind speed increases, significantly increases the power output. Areas where winds are more stronger and more constant, as in sea and high altitude sites, are preferred locations for wind farms.

Since the wind speed is not constant, the production of a wind farm's annual energy is never more than the sum of the nameplate ratings of the generator multiplied by the total number of hours in one year. The ratio of actual productivity from one year to this theoretical maximum is called the capacity factor. capacity factors are typically 20-40%, with values at the upper end of the range in particularly favorable sites. For example, a 1 MW turbine with a capacity factor of 35% will not produce 8,760 megawatt-hours per year, but only 0.35×24x365 = 3066 MWh, or an average of 0.35 MW. line data is available for certain locations and the capacity factor can be calculated from the annual production.

At Globally, the potential long-term technical wind energy is considered as five times the total current global energy or 40 times the current electricity demand. This could require large amounts of land use for wind turbines, especially in areas of higher wind resources. The average experience of offshore winds of ~ 90% larger than the land, so offshore resources could contribute substantially more energy. This number could also increase with higher altitude ground based or airborne wind turbines.

Wind energy is renewable and produces no greenhouse gases during operation, such as methane and carbon dioxdie.

Hydropower

The energy in the water (in the form of kinetic energy, differences in temperature or salinity gradients) can be exploited and used. Since water is about 800 times denser than air, even a slow flowing stream of water, or moderate swell, can yield considerable amounts of energy.

One of three Pelamis P-750 engines Ocean Wave Power in the port of Peniche / Portugal.

There are many forms of water energy:

· Hydroelectric energy is a term usually reserved for large hydroelectric dams. Examples are the Grand Coulee Dam in the State Washington and the Akosombo Dam in Ghana.

· Systems micro hydro facilities are typically up to produce hydroelectric 100 kilowatts of power. They are often used in areas rich in water as a remote power supply (RAPS). There are many of these facilities in the world, including the provision of a number around 50 kW in the Solomon Islands.

· Damless hydro systems derive kinetic energy of rivers and oceans without using a dam.

· The ocean energy describes all technologies to harness the energy Ocean and the Sea:

o Marine current power. Similar to the energy of tidal currents, using the kinetic energy ocean currents

o the conversion of ocean thermal energy conversion (OTEC) uses the difference in temperature between the hot surface of the ocean and the colder lower recesses. To this end, it employs a cyclic heat engine. OTEC has not been field tested on a large scale.

o Tidal power captures energy from the tides. Two different principles for generating tidal energy are used today:

No tidal movement in the vertical direction – Tides come, raise water levels in a basin, and tides roll. Around low tide, the water in the basin is discharged through a turbine to harness the potential stored energy.

No tidal movement in the horizontal direction – or the power of tidal currents. Using generators tidal current, such as wind turbines, but then in a tidal current. Due to the high density of water, about eight hundred times the density of air, tidal currents can have a lot of kinetic energy. Several commercial prototypes have been built and more are in development.

· Wave Power uses the energy of waves. Wave energy machines usually take the form of floating structures or Neutral carrier moving relative to another or to a fixed point. Wave power has now reached commercialization.

· Saline gradient power, or osmotic power, energy is recovered from the difference between the salt sea and river water. Reverse electrodialysis (RED) and pressure retarded osmosis (PRO) is being researched and tested.

· Deep lake water cooling, Well is technically not a method of producing energy, saves a lot of energy in summer. It uses submerged pipes as a heat sink for climate control systems. the lake-bottom is a constant throughout the year local about 4 ° C.

use of solar energy

Monocrystalline Solar Cell

In this context, "Solar energy" refers to energy that is collected from sunlight. Solar energy can be applied in many ways, including:

• Generate electricity by heating the air trapped in a revolving turbine Solar Tower.

• Generate electricity in geosynchronous orbit via satellite solar.

• Generate electricity using photovoltaic Solar Cells.

• Generate electricity using concentrated solar energy.

• production of hydrogen using photocells.

• Heat and cool air through the use of solar chimneys.

• Heat buildings directly through passive solar building design.

• heat food, thanks to energy solar ovens.

• Heat water or air for domestic hot water and heating needs using Solar Panels.

• Solar air conditioning

Biofuels

Plants use photosynthesis to grow and produce biomass. Also known as biomatter, biomass can be used directly as fuel or to produce liquid biofuel. From agriculture biomass fuels such as biodiesel, ethanol and bagasse (often a by-product of cane sugar) can be burned in internal combustion engines or boilers. Typically biofuel is burned to release its stored chemical energy. Search in more efficient methods converting biofuels and other fuels into electricity using fuel cells is an area of very active work.

of Liquid biofuels

Information on the pump, California.

Liquid biofuel is usually is a bio-alcohol as fuel ethanol or bio-oil as biodiesel and straight vegetable oil. Biodiesel can be used in vehicles Modern diesel with little or no engine modifications can be made from waste and virgin vegetable and animal oils and fats (lipids). Virgin vegetable oils can be used in modified diesel engines. In fact the diesel engine was originally designed to run on oil plant rather than fossil fuels. A major advantage of biodiesel is to reduce emissions. The use of biodiesel reduces emissions carbon monoxide and other hydrocarbons of 20-40%.

In some areas corn, corn, beet sugar cane sugar, and switchgrasses are grown specifically to produce ethanol (also known as grain alcohol) a liquid can be used in internal combustion engines and fuel cells. Ethanol is being phased into the current energy infrastructure. E85 is a fuel composed of 85% ethanol and 15% gasoline that is sold to consumers. Bioethanol is developed as an alternative to bioethanol. It is becoming more international criticism on biofuels from food crops towards issues such as food security, environmental impacts (deforestation) and energy balance.

Solid biomass

Residue from sugar cane can be used as biofuel

Solid biomass is mostly commonly usually used directly as fuel, producing 10-20 MJ / kg of heat.

Its forms and sources include fuel wood, the biogenic portion of municipal solid waste, or the unused portion of field crops. Crops can or can not be grown intentionally as an energy crop, and plant remains byproduct used as fuel. Most types of biomass contain energy. Even cow manure still contains two-thirds of the energy consumed by the cow. Energy recovery through a bioreactor is a cost effective solution to problems of waste disposal faced by dairy farmers, and can produce enough biogas to run a farm.

With current technology, it is not ideal for use as a transportation fuel. Most transportation vehicles require power sources, with a high power density, as as that provided by internal combustion engines. These engines generally require clean fuels, which are usually in liquid form, and to a lesser extent, compressed gaseous phase. Liquids are more mobile because they have a high energy density, and they can be pumped, this which makes handling easier. This is why most transportation fuels are liquids.

Non-transport applications can usually tolerate power low-density external combustion engines that can run directly on the cheaper fuel biomass solids, combined heat and electricity. One type of biomass is wood, which has been used for millennia in varying quantities, and, more recently, finding increased use. Two billion people currently cook every day, and heat their homes during the winter by burning biomass, which is a contributor leading to global climate change by human world. The presence of black soot which runs from Asia to polar ice caps are melting more quickly in summer. In the 19th century, steam engines at the fire were common, contributing significantly to air pollution industrial revolution unhealthy. Coal is a form of biomass that has been compressed over millennia to produce a non-renewable fuel, highly polluting fossil fuels.

Wood and its byproducts can now be converted by processes such as gasification into biofuels such as from wood, biogas, methanol or ethanol fuel, although the development may not be required to make these methods accessible and practical. sugar residue cane, wheat chaff, cobs com and other matter may be, and are burned with some success. Net emissions dioxide carbon are added to the atmosphere by this process are that the fossil fuel was consumed to plant, fertilize, harvest and transporting biomass.

The process of harvesting the biomass of short rotation poplars and willows, and perennial grasses such as switchgrass stiff, Phalaris, and miscanthus, require less frequent cultivation and less nitrogen than typical annual crops. Pelletizing miscanthus and burning it to produce electricity is being studied and may be economically viable.

Biogas

Biogas can easily be produced from waste streams currently, such as: paper production, sugar production, sewage, animal waste and so on. These various waste streams must be diluted together and allowed to naturally ferment, producing methane gas. This can be done by converting current sewage plants into biogas plants. When a biogas plant has extracted all the methane can, the remains are sometimes better suited than fertilizer from biomass origin.

Alternatively biogas can be produced by advanced treatment systems waste such as mechanical biological treatment. These systems recover the recyclable elements of household waste and process the biodegradable fraction in anaerobic digesters.

Renewable natural gas is a biogas which has been upgraded to a quality similar to gas natural. By improving the quality of the natural gas, it becomes possible to distribute the gas to the mass market via gas grid.

Geothermal energy

Krafla Geothermal Station in northeast Iceland

Geothermal is the energy obtained by tapping the heat of the earth itself, usually miles deep in the crust. It is expensive build a power plant, but operating costs are low resulting from low energy costs for suitable sites. Ultimately, this energy comes from heat in the earth core. The government of Iceland states: "It should be stressed that the geothermal resource is not strictly renewables in the same way that hydroelectric resources. "He believes that geothermal energy from Iceland could provide 1700 MW more 100 years compared to current production of 140 MW. radioactive elements in the crust of the earth continuously decay, recovery of heat. Agency International class geothermal renewable energy.

Three types of power plants are used to produce electricity from geothermal energy: dry steam, flash, and binary. Dry steam plants take steam fractures in the ground and use it to directly drive a turbine which turns a generator. Flash plants bring hot water, usually at temperatures above 200 ° C, out of the ground, and it can boil as it rises to the surface then separates from the vapor to steam / water separators and then runs the steam through a turbine. In binary installations, hot water circulates through heat exchangers, boiling an organic fluid that spins the turbine. The condensed steam and other geothermal fluid from the three types of plants are injected into the hot rock to pick up more heat.

Geothermal energy from the Earth's core is closer to the surface in some areas than others. When steam or hot water underground can be harnessed and put to the surface, it can be used to produce electricity. These energy sources Geothermal exist in certain geologically unstable parts of the world such as Chile, Iceland, New Zealand, USA, Philippines and Italy. The two most important areas in this regard in the United States are in the Yellowstone Basin and northern California. Iceland produced 170 MW of energy Geothermal heated and 86% of all houses in the year 2000 through geothermal energy. Some 8,000 MW of operational capacity total.

There is also the potential to produce geothermal hot dry rocks. The holes of at least 3 km deep are drilled into the ground. Some of these holes pump water into the ground, while other holes pump hot water. The resource consists heat hot underground radiogenic granite rocks, the heat when there is enough sediment between the rock and the earth's surface. Several companies in Australia are exploring this technology.

commercialization of renewable energy

Costs

Source Energy Cost 2001 Cost of energy potential future

Electricity

Wind 8.4 ¢ / kWh 3.10 ¢ / kWh

Solar photovoltaic 25-160 ¢ / kWh 5.25 ¢ / kWh

Solar thermal 12-34 ¢ / kWh 4.20 ¢ / kWh

Large hydropower 10.2 ¢ / kWh 2.10 ¢ KWh

Small hydro 2.12 ¢ / kWh 2.10 ¢ / kWh

Geothermal 2.10 ¢ / kWh 8.1 ¢ / kWh

Biomass 3.12 ¢ / kWh 4.10 ¢ / kWh

Coal (comparison) 4 ¢ / kWh

Heat

Geothermal 0.5 to 5 ¢ / kWh 0.5 to 5 ¢ / kWh

Biomass – Heat 1-6 ¢ / kWh 5.1 ¢ / kWh

Low temperature solar heat 25.02 ¢ / kWh 2.10 ¢ / kWh

All costs are in 2001 U.S. $ per cent kilowatt-hour.

New generation of solar thermal power plants

The 11-megawatt PS10 tower Solar in Spain produces electricity from the sun using 624 large movable mirrors called heliostats.

Aerial view of a the SEGS plants.

Since 2004 there has been a renewed interest in solar thermal power plants and two plants were completed in 2006/2007: the 64 MW Nevada Solar One and the 11 MW PS10 solar tower in Spain. Three 50 MW trough plants were under construction in Spain at the end of 2007 with another 10 plants under 50 MW. In the United States, utilities in California and Florida have announced plans (or contracted) at least eight new projects totaling more than 2,000 MW.

In developing countries, three World Bank projects for integrated CSP / combined cycle power turbine gas in Egypt, Mexico and Morocco were approved during 2006/2007.

There are several solar thermal power plant in the Mojave Desert power for the grid. The solar energy generating systems (SEGS) is the name given to nine Solar Power plants in the desert Mojave, which were built in the 1980s. These plants have a combined capacity of 354 MW making it the largest solar power plant installation the world.

the world's largest photovoltaic power plants

Several large photovoltaic power plants have been made in Spain in 2008: the Parque Fotovoltaico Olmedilla de Alarcon (60 MW), the Solar Park Merida / Don Alvaro (30 MW), Planta solar Fuente Alamo (26 MW), Planta Fotovoltaica of Lucainena de las Torres (23.2 MW), Parque Fotovoltaico Abertura Solar (23.1 MW), the Solar Park Hoya Los Vincente (23 MW), the Calveron Solarpark (21 MW), and the Planta Solar La Magascona (20 MW).

First Solar PV Array 40 MW installed by JuWi Waldpolenz Group, Germany

Waldpolenz Solar Park, which will be the world's largest photovoltaic thin flim (PV) power system is built on a former military airbase east Leipzig, Germany. The power plant will be a Solar Energy System of 40 megawatts using the state of the art-film technology thin, and should be completed by the end of 2009. 550,000 First Solar thin-film modules will be used, which offers 40,000 MWh of electricity year.

Topaz Solar Farm is a proposed 550 MW photovoltaic power plant, to be built in north-western valley of California USA at a cost of over $ 1 billion. Built on 9.5 square miles (25 km2) of Ranchland, the project would use Photovoltaic Panels designed to thin and manufactured by OptiSolar in Hayward and Sacramento. The project would deliver approximately 1,100 gigawatt hours (GWh) per year of renewable energy. The project should begin in 2010, to begin delivery in 2011 and be fully operational by 2013.

High Plains Ranch is a proposed 250 MW solar photovoltaic, to be built by Sun Power in the Carrizo Plain, northwest of California Valley.

However, when it comes to energy systems renewables and photovoltaics, it is not only large systems that matter. Building integrated photovoltaics or "onsite" PV systems have the advantage of being tailored to the end consumer energy needs in terms of scale. Thus the energy is provided close to where it's needed.

Environmental and social considerations

While most renewable energy sources produce no direct pollution, materials, equipment of industrial construction and used to create them may generate waste and pollution. Some renewable energy systems actually create problems environment. For example, wind turbines can be more dangerous to birds.

Land area required

Another environmental problem, particularly with biomass and biofuels, is the large amount of land needed for energy harvesting which could otherwise be used for other purposes or left as undeveloped land. However, it should be emphasized that these fuels could reduce the need for harvesting non-renewable energy sources, such as extensive surface mining areas and the mountains of slag Coal, the safety zones around nuclear plants, and hundreds of square miles of oil sands looted. These responses, however, do not account for the high biodiversity and endemism of land used for crops for ethanol, sugar cane in particular.

In the U.S., crops grown for biofuels are the most land and water-intensive of the renewable energy sources. In 2005, approximately 12% of the country's corn crop (covering 11 million acres (45,000 km ²) of farmland) was used for the production four billion gallons of ethanol which is equivalent to about 2% of annual consumption of gasoline in the United States. For biofuels to make a much larger contribution to saving energy, the industry will accelerate the development of raw new agricultural practices and technologies that are more effective land and water. Already, the efficiency of biofuel production has considerably increased and there are new methods to stimulate the production of biofuels.

Hydroelectric dams

The major advantage of hydroelectric systems is the elimination of the cost of fuel. Other benefits include longer life than the generation fuel, low operating costs, and provision of facilities for water sports. Operation of pumping improves daily load factor of production system. Overall, hydroelectric power can be much cheaper than electricity produced from fossil fuels or nuclear energy, and abundant hydroelectric power zones to attract industry.

But there are several major disadvantages of hydroelectric systems. These include: dislocation of people living where the reservoirs are planned, release of significant amounts of carbon dioxide at construction and flooding of the reservoir, disruption of ecosystems and aquatic birds, adverse effects on the environment of the river, the potential risks of sabotage and terrorism, and in rare cases catastrophic failure of the dam.

more hydroelectric power is now more difficult to site in developed countries as major sites within these nations are already exploited or may be unavailable for other reasons such as environmental considerations.

Wind farms

Wind power is one source the most environmentally friendly renewable energy

A wind farm, when installed on farmland, has one of the lowest environmental impacts of all energy sources:

• He occupies an area less per kilowatt hour (kWh) of electricity generated than other energy conversion system further, outside the solar on the roof, and is compatible with grazing and crops.

• It generates energy used in its construction in just 3 months of operation, but its operational lifetime is 20-25 years.

• Gas Emissions greenhouse gases and air pollution produced by its construction are small and declining. There are no emissions or pollution produced by its operation.

• By replacing the coal-fired base-load, wind energy produces a net reduction of greenhouse gas emissions emissions and air pollution, and a net increase of biodiversity.

• Modern wind turbines are almost silent and rotate so slowly (in terms of number of revolutions per minute) they are rarely a danger to birds.

Studies of birds and offshore wind farms in Europe have found that there are very few bird collisions. Several offshore wind sites in Europe have been in high traffic areas by seabirds. Improvements in turbine design, including a much slower rate of rotation of the blades and a smooth tower base instead of pylons Lattice perchable have helped reduce bird mortality in wind farms across the world. However most small wind turbines can be dangerous to birds. Birds are severely impacted by fossil fuel energy; examples include birds dying from exposure to oil spills, habitat loss from acid rain and mountain removal coal mining, and mercury poisoning.

Other issues

Durability

Renewable energy sources are generally sustainable in the sense that they can not "fail" and in the sense that their environmental and social impacts are generally milder than those fossils. However, both biomass and geothermal energy require wise management if they are to be used sustainably. For all other renewables, almost any realistic rate of use would be unlikely to approach their rate of replenishment of nature.

Transmission

If renewables and distribution were to become widespread, transmission electrical distribution systems for electricity could not be the main distributors of electricity, but would effect of balancing the electricity needs of local communities. Those who have excess energy would be sold to areas who need "recharging". In other words, network operation would require a change from "passive management" – in which the generators are hooked and the system is operated to get electricity 'downstream' to the consumer – the "active management", where generators are distributed in a network and inputs and outputs must be constantly monitored to ensure proper balancing occurs within the system. Some governments and regulators need to rectify the situation, but much remains to be done. A possible solution is the increased use of asset management of electricity transmission and distribution networks. This will require significant changes in how these networks operate.

However, on a smaller scale, the use of renewable energy produced on site reduces burdens on electricity distribution systems. Current systems, while rarely profitable, have shown that an average household with an array of solar panels and a properly sized system energy storage electricity needs from outside sources for only a few hours a week. By matching the supply electricity to end-use needs, advocates of renewable energy and soft energy path believe electricity systems will become smaller and easier to manage, rather than the reverse.

Controversy over nuclear energy as a source of renewable energy

In 1983, physicist Bernard Cohen proposed that uranium is effectively inexhaustible, and could therefore be considered a renewable energy source. He said that fast reactors fueled by uranium mined from seawater, could supply energy at least as long as the sun is expected remaining lifespan of five billion years. Energy Nuclear has also been described as "renewable" by politicians George W. Bush, Charlie Crist, and David Sainsbury.

Inclusion under the "renewable energy" classification could make nuclear power projects eligible for development aid under various jurisdictions. However, it has not been established that nuclear energy is inexhaustible, and issues such as uranium peak and depletion uranium are ongoing debates. No legislature has not included nuclear energy under a legal definition "sources of energy" for the provision of development assistance. Similarly, the legal and scientific energies Renewable usually exclude nuclear power. Commonly from the definitions of renewable energy sources often omit or explicitly exclude sources of nuclear fission examples.Nuclear is not considered renewable by the U.S. DOE on the website "What is energy?"

There are also environmental concerns about energy nuclear, including environmental risks of hazardous nuclear waste and concerns that the development of new power plants can not get enough quickly to reduce CO2 emissions, such as nuclear energy is neither efficient nor effective in reducing CO2 emissions.

ADVANTAGES AND DISADVANTAGES renewable energy:

There are many energy sources today that are extremely limited in quantity. Some of these sources include oil, natural gas and coal. It's a matter of time before they are exhausted.

Estimates are that can meet our energy needs for another fifty or sixty years. Thus in an effort to find alternative forms of energy, the world has turned to renewable energy sources as the solution. There advantages and disadvantages to this.

Renewable energy sources include solar, hydroelectric, wind, geothermal, ocean and biomass. The most common advantage of all is that they are renewable and can not be exhausted. They clean energy, because they do not pollute the air, and they do not contribute to global warming or the greenhouse effect. Since their natural sources are the cost operations is reduced and they require less maintenance on their plants. A drawback common to all is that it is difficult to produce quantities severe power counterparts of fossil fuels are capable of. As they are also new technologies, the cost of opening is high.

Solar power allows the use of solar energy. It is advantageous because the systems can enter the buildings it does not affect existing land use. But since the sensor area, the more materials are needed. Solar radiation is also controlled by geography. And it is limited to daylight hours and days not covered.

Wind energy uses the power of wind to generate electricity. Despite being the largest producer of jobs, it depends on strong winds. Wind turbines are large and Although you can use in their area for farming, many consider them unattractive appearance. They are also very noisy to operate. In addition, they threaten the wild bird population.

Hydropower uses water to generate energy. This is the most reliable of all sources of renewable energy. On the negative side, it affects ecology and causes problems downstream. The decomposition of vegetation along the river may cause the accumulation of methane. Methane gas is contributing to the greenhouse effect. Dams can also alter the natural flow of the river and wildlife. Colder, oxygen poor water can be discharged into the river, killing fish. And the release of water from the dam can cause flooding.

Geothermal energy uses steam from the ground Earth to produce energy. He uses the land smaller than other plants. They can operate 24 hours a day, every day of the year. The disadvantages are that it is very site specific and, with the heat of the Earth, it may also introduce toxic chemicals when obtaining steam. Drilling geothermal reservoirs and finding them can be an expensive task.

Biomass electricity is generated using energy from wood, agricultural waste and municipal. It saves on the transportation of waste by landfill but can be expensive and ecological diversity of land may be affected. In addition, the process must be made simpler.

The energy of the oceans is a form of clean and abundant energy. It is, however, have high costs. Thermal energy required also close to a difference of one degree Fahrenheit temperature of forty years the water. In addition, construction and laying of pipes can cause damage to the ecosystem.

There are many advantages to using renewable energy sources. There also some disadvantages. The fact is that energy demand will continue to increase. Through research and development, as well as, new technologies, the hope is many of the disadvantages of renewable energy sources can be eliminated and we can successfully integrate in our diet.

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