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New study results on Low frequency and Infrasound effects from IWT’s

From Central Bruce Wind Action

Acoustician Rick James has provided the context, and content, of a new report from Wisconsin that concludes:“The four investigating firms are of the opinion that enough evidence and hypotheses have been given herein to classify LFN and infrasound as a serious issue, possibly affecting the future of the industry.”

Cooperative Measurement Survey and Analysis of Low-Frequency and Infrasound at the Shirley Wind Farm | Wind Watch:


It was decided that they would push for a study that included four acoustics experts, some on the wind industry side (Hesslers), independents (Schomer and Walker [Channel Islands]) and one who has demonstrated the ability to find infrasound inside homes (Rob Rand). I was not available on the proposed test dates so I could not participate but Rob Rand was a very good alternative. This also leaves me free to do my own evaluation of the study and collected data and audio files. I believe that the participation of the Hesslers and Clean Wisconsin make it much harder for the wind industry trade associations to claim that this work is biased.

All three homes were found to have measurable infra and low-frequency sound from the wind turbines with levels decreasing as distance increases. …

Although there are details in the report that I would take issue with, I can say that the team portion of the report presents a major step forward in the discussion about why adverse health effects are being reported by people living near modern industrial scale upwind wind turbines. The primary conclusion of the team is:

The four investigating firms are of the opinion that enough evidence and hypotheses have been given herein to classify LFN and infrasound as a serious issue, possibly affecting the future of the industry. It should be addressed beyond the present practice of showing that wind turbine levels are magnitudes below the threshold of hearing at low frequencies.

The argument about whether wind turbines produce infra and low-frequency sound and if they do, whether it is sufficient to cause adverse health effects has taken a big step forward with this conclusion. That infra and low-frequency sound is a primary characteristic of wind turbine acoustic emissions was established by the team.  The argument that infrasound produced by modern upwind wind turbines does not have sufficient amplitude to reach the threshold of hearing (set for steady pure tones, not the complex mix of tones emitted by wind turbines) —raised by the wind industry through its experts like Dr. Leventhall and the many acousticians and others who parrot his opinion — is now discredited. 

Rick James’ full commentary can be read at National Wind Watch, which also has posted the link for the report to the Public Service Commission of Wisconsin,  “A Cooperative Measurement Survey and Analysis of Low Frequency and Infrasound at the Shirley Wind Farm in Brown County, Wisconsin

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