Average Payback Period For Small Wind Turbines?

Factors Influencing Payback Period

The payback period for small wind turbines is influenced by various factors, including the turbine’s capacity, local wind speeds, and energy costs. A 2-5 kW turbine in a location with average wind speeds of 6-7 meters per second (m/s) can generate around 8,000-10,000 kilowatt-hours (kWh) of electricity per year. This energy output can offset a significant portion of a household’s energy costs, leading to a shorter payback period.

Capacity Factor and Wind Speed

The capacity factor of a wind turbine is a critical factor in determining its energy output. A capacity factor of 30-40% is typical for small wind turbines installed in residential areas. This means that the turbine will produce electricity at or near its maximum capacity for about 30-40% of the time. For example, a 2.5 kW turbine with a capacity factor of 35% will produce around 7,500 kWh of electricity per year in a location with average wind speeds of 6.5 m/s. This energy output can significantly reduce a household’s reliance on grid electricity and lead to a shorter payback period for the turbine.

Payback Period Example

To illustrate the payback period for a small wind turbine, let’s consider a scenario where a household installs a 2.5 kW turbine with a purchase price of $10,000. The turbine generates around 7,500 kWh of electricity per year, which offsets a significant portion of the household’s energy costs. Assuming an energy cost of 15 cents per kWh, the turbine saves the household around $1,125 per year in energy costs. With an interest rate of 5%, the payback period for the turbine would be around 8-10 years, depending on the specific installation costs and local wind speeds.