What determines the payback time of a small wind turbine?

For most countryside homeowners and farmers, the question is simple: will a wind turbine save enough money to justify the investment?

A small wind turbine can significantly reduce electricity costs if the conditions are right. To make this transparent, KiteX provides a savings estimator on the front page of the website. The tool estimates yearly production and potential savings based on wind conditions and electricity prices based on data from two sites, one in Denmark and one in Germany.

Electricity that you use yourself normally has the highest value, because it replaces electricity that would otherwise be purchased from the grid. In the savings estimator we use a ratio, when the power demands align well with the turbines generation characteristics, e.g. with one or more heat pump(s) and 25,000+ kWh/year electricity use our estimate is that a direct consumption percentage of 80% is likely. Below 20,000 kWh/year we usually derate the direct consumption ratio to 60%.

The deep dive into four things that largely determine payback:

Wind conditions at your property

Average wind speed is the most important factor.

Open rural locations usually have stronger and more stable wind than urban areas. This is why small wind turbines are typically installed at:

• Farms
• Countryside homes
• Rural businesses

Even moderate wind conditions can generate significant electricity over the course of a year. The average wind direction and turbulence intensity at the spot also contribute. As a rule of thumb having a clear path to the turbine from the average wind directions on the spot is a good start, e.g. in Denmark this would be West to South West for most locations. 

The size of the rotor

A turbine captures energy from the area swept by its blades.

The TWT-11 sweeps about 89 m² of air. This relatively large rotor area allows the turbine to generate meaningful electricity even at moderate wind speeds.

In general, a larger rotor means:

• More energy captured
• More consistent production
• Better performance in lower winds

Electricity prices

The value of the electricity produced depends on the price of grid electricity.

Higher electricity prices increase the financial value of producing electricity locally.

As there is a large difference in price between kWh bought and sold to the net, your ratio of direct consumption plays a huge part in terms of savings. 

Typical ranges are:

Household: 40–60%
Farm: 60–80%
Energy-intensive property: 80–95%

Farms often benefit the most because electricity is used continuously for things such as ventilation, cooling, pumps, and machinery.

Example case:

TWT-11 annual production: ~25,000 kWh
Direct consumption: 80%
Electricity price: ~1.25 DKK/kWh
Estimated yearly savings: ~25,000–30,000 DKK

With a turbine price of 165,000 DKK, this corresponds to a typical payback time of around 6–8 years.

Actual results will vary depending on wind conditions, electricity usage, and electricity prices.

Why wind works well for rural homes

Wind turbines can be particularly valuable for countryside properties because they:

• Produce electricity day and night
  
• Generate strong production during winter
  
• Work well together with solar systems

For properties with steady electricity demand, a turbine can cover a meaningful share of the base electricity load.

This provides a quick way to understand whether a small wind turbine could make sense for your home or farm.

Try our savings estimator below, or contact us for a more precise estimate!