What is the difference in kilowatt hours of monthly energy production between an average local wind speed of 15 miles per hour and an average local wind speed of 10 miles per hour?

The difference in Kilowatt hours of monthly energy production and average local wind speed is that kilowatts produce energy and the wind speed produces the difference of miles per hour in the energy. So say if it was a power going out that would be the cause.

 The ability to generate electricity is measured in watts. Watts are tiny units, so the terms kilowatt (kW, 1,000 watts), megawatt (MW, 1 million watts), and gigawatt (pronounced "jig-a-watt," GW, 1 billion watts) are most commonly used to describe the capacity of generating units like wind turbines or other power plants. 

Electricity production and consumption are most commonly measured in kilowatt-hours (kWh). A kilowatt-hour means one kilowatt (1,000 watts) of electricity produced or consumed for one hour. One 50-watt light bulb left on for 20 hours consumes one kilowatt-hour of electricity (50 watts x 20 hours = 1,000 watt-hours = 1 kilowatt-hour). 

The output of a wind turbine depends on the turbine's size and the wind's speed through the rotor. Wind turbines being manufactured now have power ratings ranging from 250 watts to 5 megawatts (MW). 

Example: A 10-kW wind turbine can generate about 10,000 kWh annually at a site with wind speeds averaging 12 miles per hour, or about enough to power a typical household. A 5-MW turbine can produce more than 15 million kWh in a year--enough to power more than 1, 400 households. The average U.S. household consumes about 10,000 kWh of electricity each year. 

Example: A 250-kW turbine installed at the elementary school in Spirit Lake, Iowa, provides an average of 350,000 kWh of electricity per year, more than is necessary for the 53,000-square-foot school. Excess power fed into the local utility system earned the school $25,000 in its first five years of operation. The school uses electricity from the utility at times when the wind does not blow. This project has been so successful that the Spirit Lake school district has since installed a second turbine with a capacity of 750 kW. (For further information on this project, see at the Web site of the International Council for Local Environmental Initiatives.) 

Wind speed is a crucial element in projecting turbine performance, and a site's wind speed is measured through wind resource assessment before a wind system's construction. An annual average wind speed higher than four meters per second (m/s) (9 mph) is required for small wind electric turbines (less wind is needed for water-pumping operations). Utility-scale wind power plants require minimum average wind speeds of 6 m/s (13 mph). 

The power available in the wind is proportional to the cube of its speed, which means that doubling the wind speed increases the available power by a factor of eight. Thus, a turbine operating at a site with an average wind speed of 12 mph could, in theory, generate about 33% more electricity than one at an 11-mph site, because the cube of 12 (1,768) is 33% larger than the cube of 11 (1,331). (In the real world, the turbine will not produce quite that much more electricity, but it will still generate much more than the 9% difference in wind speed.) The critical thing to understand is that what seems like a small difference in wind speed can mean a significant difference in available energy and electricity produced, and therefore, a significant difference in the cost of the heat generated. Also, there is little energy to be harvested at very low wind speeds (6-mph winds contain less than one-eighth the power of 12-mph winds).

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