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The “number of homes served” is just a convenient way to translate a quantity of electricity into a familiar term that people can understand. The school uses electricity from the utility at times when the wind does not blow all of the time, it cannot be the only power source for that many households without some form of storage system. Excess electricity fed into the local utility system earned the school $25,000 in its first five years of earth4energy review operation. 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. A 5-MW turbine can produce more than 15 million kWh in a year–enough to power more than 1 to 400 households.

This entry was posted on Saturday, October 31st, 2009 at 4:30 am and is filed under Home.