Wind turbines used to generate electricity come in a wide variety of sizes. Large wind
turbines, which are usually installed in clusters called windfarms, can generate large
amounts of electricity. Large wind turbines may even produce hundreds of megawatts (MW)
of electricity - enough to power hundreds of homes. Small wind turbines, which are
generally defined as producing no more than 100 kW of electricity, are designed to be
installed at homes, farms and small businesses either as a source of backup electricity, or to
offset use of utility power and reduce electricity bills. Very small wind turbines (20-500 watt
units) are used to charge batteries for sailboats and other recreational uses.