Valuing a new wind farm project: history and economics

Wind Farm Grids

Wind Farm Valuation

Value a new Wind Farm project

Hurricane or tornado survivors or anyone who has seen pictures of the aftermath of these storms will realize there is enormous energy potential in wind power. The problem is taming this energy so that it is useful without being destructive.

Wind energy is derived from the sun. Because the sun's energy is not absorbed uniformly, some regions of Earth's atmosphere are warmer than others. The warmer air expands and rises; the cooler air contracts and settles. The expanded air is at a lower pressure than the cooler air. The difference in pressure causes a wind to blow. There is a further bonus in wind energy, not attributable to the sun but to whatever caused Earth to rotate in the first place. Earth, in its furious spin, drags some of the air close to it around, causing prevailing winds to blow from west to east (Snyder, 2010).

Humans have made use of this form of energy for millennia. For centuries, ships sailed under wind power until devices were invented which converted wood, coal, or other fossil fuels into the energy necessary to drive a ship (Pew Center, 2010).

As early as the 20th century B.C., the Babylonian Emperor Hammurabi planned to use windmills (devices with sails) for capturing the wind's energy and pumping water for irrigation. Notice that despite its end use, we have called the device a windmill. Many centuries later, it was principally used to grind grain between two millstones -- therefore the name windmill, in spite of its more universal usefulness. What it actually does, any motionless device with sails to utilize the wind's energy, is known as a windmill. Even though it is occasionally called a wind machine or a wind turbine (Snyder, 2010).

The Dutch, evidently, do not dominate the windmill industry. Almost every country in the world has during some point in their history used the wind as a resource of power. The Dutch initiated windmills in the United States as soon as they settled here (Wind-Farm Placement, 2009). The most admired American model was the light pinwheel type put up on an elevated tower and can even now be observed on some farms. Millions were set up into the country to siphon water and were later on used to produce electricity. As soon as rural electrification was launched, windmill retailing and utilization declined sharply (Snyder, 2010).

Financial Considerations

Expenses of wind- delivered electrical energy are now comparable to costs of generation from fossil fuel. In the 80's the expenses were 12 cents per kilowatt hour. The present price is approximately 6 cents per kilowatt hour. This cost comprises not only the functioning and preservation costs but also the attention on the capital asset, the lease of the land, indemnity costs, and all other operating cost of managing a business. Additional improvements are just around the corner. It is probable that costs will be additionally decreased to 2.5 cents per kilowatt hour, by means of taller towers to generate the winds at elevated sections where they are stronger and drive more frequently. Improvements in the sails and turbines will in addition enhance this decrease in costs.

In excess of 3% of California's electrical requirement is now fulfilled by wind turbines. A lot of states even have a larger amount of wind potential than California. Researchers in the state of Washington calculate that North and South Dakota, by means of wind power, may possibly provide 80% of the United States electricity demand (Schleede, 2003). This is accurate even if one were to leave out as possible sites all of the environmentally susceptible and urban lands, half of the forest areas, and a quarter of the agricultural areas. These two states are not the just the sole feasible sources of a sufficient wind delivery setup. The United States has sufficient wind potential to make available more than a few times the amount of electricity that is at this time used. It is doubtful that this type of power will not be fully accomplished with the availability of appropriate land sites (Texas State Energy Conservation Office, 2012). It is definitely not irrational to expect that wind turbines stand equipped to make available no less than 45-55% of the United States electrical requirements when the anticipated fossil fuel predicament finally happens. Researchers are hopeful about the rest of the world's prospects for wind farms (Gardner, 2009).

Feasibility Report

The wind is a renewable, does not pollute, and comparatively low-priced source of power. Additionally wind generators are modular and can be setup rapidly and reasonably as demand increases. Fossil fuel generators are strenuous resources and need several years to construct.

There are a number of negatives to wind power, neither of those seem impossible to rise above. As wind machine use rises there will predictably be disagreements about land use. Wind power creation needs a large area of space. As a result of the turbulence produced by the rotating blades, the machines have to be positioned between 180-230 meters away from each other. A competent wind farm ought to have no less than 200 of these machines. Wind turbines take up under 8% of the area of the wind farm. The remaining space can be utilized for agricultural farming, ranching, or any other appropriate use even as the power is being produced (Pew Center, 2010). The real estate history in central in California shows that land values may even rise significantly when wind farms start operating. There are a number of remote areas appropriate for wind turbine use where the significance of the power generated could be in excess of 100 times the present market value of the property. On the other hand there will be grievances about noise and visual disfigurement. Denmark has dealt with these problems by charting out standards (Texas State Energy Conservation Office, 2012).

At the moment, in nearly all turbines a generator is employed to take the electrical generator up to an insignificant speed of 1600 revolutions per minute (RPM). To facilitate nonstop power accessibility hybrid systems have been suggested. These join wind power with petrol of diesel generators (Wind-Farm Placement, 2009). In wind -- diesel hybrid setups, wind turbines are joined to the diesel generators on a universal electric grid, to displace part of the fuel. The benefits of such a combination of power sources outweigh the disadvantages characteristic of the individual power sources (Schleede, 2003). A wind power -- diesel hybrid typically will have significantly lower operating costs than a primary diesel electric generator. State-of-the-art intelligent microprocessor-based controllers are now making such systems easy to arrange. Stand-alone wind power systems will only provide power when the wind is blowing. Thus, the power output is variable, unless a storage system is available. Also, a hybrid system with a diesel generator makes storage unnecessary.

Wind energy is a partial solution to environmental problems created by other power-generating technologies. For example, in 2003, California's wind power plants offset the emission of more than 2.8 billion pounds of carbon dioxide from relatively clean-burning gas fired power plants (Schleede, 2003). These same wind power plants offset 16 million pounds of nitrogen oxide, sulphur dioxide, and particulates which would have been emitted from California's oil-fired power plants. Also wind energy generation has no adverse effect on water supply (Gardner, 2009).

Once installed, wind turbines have little or no impact on ground-based flora or fauna. Impacts on humans include interference with electromagnetic signals, aero acoustic noise generation, and visual pollution. All of these require careful attention to project design as well as sitting clusters of machines away from highly populated areas. Regulation of noise level is under consideration in some countries. The most recent Danish regulation recommends a 45-decibel (dB) level at a 200-m distance from the nearest dweller (Schleede, 2003). In residential areas a noise level of only 40 dB is permitted. At present, there are no standard maximum permitted noise levels specifically for wind turbines in any Caribbean country. For wind farms, with say 30 turbines of 300 kW each, 45 dB at 500 meters distance is acceptable (Pew Center, 2010).

The majority of wind turbines supplying power to the grid work at a preset speed employing an induction generator. These three-phase generators are connected to the grid by means of suitable transformers. In a number of situations they can be coupled straightforwardly online or by means of uninterrupted thyristors configured to allocate a soft start facility. A little static reparation is incorporated in the bond to reduce the load on the grid for reactive power supply, which would consequently become a price tag to the wind turbine manager. Wind farms (a collection of wind turbines) are most efficient when linked to well-built sections of the high-voltage grid line. Solitary machines can be linked to the 11 kilovolts (kV) distribution transmission line (Pew Center, 2012). More often than not, no technical difficulties are seen in assimilating into the grid. It is recommended that no less than 15% wind energy diffusions can be held without trouble.

On the other hand, at a local level, incorporation problems turn out to be more important as considerable amounts of wind power are set up in a specific region. According on the fault level of the network at a particular end, if the installed wind capability is excessively high, intolerable voltage fluctuations may happen. Excessive fluctuations in the power production as a result of wind turbulence or wind turbines coming off line will generate voltage flicker. Power electronic boundaries are being used to a greater extent to help in reducing the brunt of wind turbines on the grid (Wind-Farm Placement, 2009).

Conclusion

Wind turbines are also a potential electromagnetic interference source. Telecommunication interference can occur and so plant locations should avoid microwave transmission paths, keeping a 5-km clearance from radio stations and airports (Pew Center, 2012). Safety for people and property is an environmental concern in wind farm installation (Pew Center, 2012). Blades and other structures can fail, so people and property should have proper clearance. In Denmark, regulations forbid roads and buildings to be sited at less than 90 meters plus 2.7 times the rotor diameter from the nearest turbine of a wind farm. A primary impact of wind turbines is visual. This is exacerbated by the need to site wind farms in the windiest areas, usually exposed high areas, which often have a natural beauty. Perhaps wind farms should not be sited within nature reserves and other protected areas or special areas of conservation.