 In the United States, residential wind turbines with outputs of 2–10 kW typically cost between and installed ( per watt), although there are incentives and rebates available in 19 states that can reduce the purchase price for homeowners by up to 50 percent, to $3 per watt.The US manufacturer Southwest Windpower estimates a turbine to pay for itself in energy savings in 5 to 12 years.The dominant models on the market, especially in the United States, are horizontal-axis wind turbines.