Complete Wind Site Assessment

We'll install a temporary, one-two or -three anemometer tower at your wind site and log wind data for two to six months. At the end of the test period we'll remove the equipment and analyze the data.

Within two weeks you'll get a detailed wind resource report on your site.

The report will include:

An estimate of annual and monthly energy production for up to three wind turbine systems
An estimate of production increases based on various tower heights for each of these systems
A comparison of your site with other wind sites in your area
Graphs of windspeed vs turbine height at your site
Graphs of turbulence intensity at your site
Graphs of windspeed, wind direction, and power distribution
Graph of monthly energy production based on three or more years of historical data from a reference site
Shadow flicker analysis for one receptor
See Sample Report #1 and Sample Report #2.

Shadow Flicker Analysis

North Wind Measurement can accurately determine if a wind turbine will cast a shadow on a nearby residence. The report will include the dates and number of minutes per day that the residence will be impacted.

Many zoning ordinances require a shadow flicker impact study as part of the permitting process. In many cases, a study is not required because of the distance between the turbine and the residence or the orientation between the two.

See Small Wind Shadow Flicker to see if your site needs a study

Noise Measurement

North Wind Measurement can test for baseline ambient noise at a receptor site. This is the first step in establishing the noise impact a wind turbine will have on a nearby residence.

Ambient noise levels are correlated with windspeed at the proposed turbine site and the receptor site. Various techniques from simple noise propagation calculations to acoustic modeling can then be used to predict levels and occurrence of noise at the receptor.

Complete Price List

What is an anemometer?

An anemometer measures wind speed. The most common type is the three-cup anemometer you see at meteorological measuring sites (met sites).

Why is tower height important?

Windspeed increases with elevation. It's not much, but the power in the wind increases with the third power (cube) of windspeed. So a small increase in windspeed makes a large increase in energy production. A doubling of tower height can increase production by 50-100%.

What is power distribution?

Wind speed is constantly changing. Some sites have mostly low wind with brief periods of high wind. Some sites are the opposite. 80-90% of the energy production occurs in 10-20% of the time. A coastal area has a very different wind distribution than an inland area. A flatland area has a different distribution than a hilly area. A wind assessment can characterize your site and more accurately predict your energy production.