Nantucket Does It Need: Offshore Wind Noise Mitigation Study to Residential Locations

In 2010 Massachusetts began installing megawatt wind turbines at residential locations with health problems. Several of these turbines generated 110 decibels of noise. The projects exceeded the nighttime decibel levels and studies referenced human annoyance from infrasound. 
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All wind turbines generate broadband, Infrasonic, impulsive, and tonal sound. Land-based wind turbine studies in the past dealt with two types of noise. The first called regulatory is measured in decibels. States and municipalities restrict the decibel levels. The second is human annoyance or infrasound determined by studies. Infrasound is sometimes called noise you can not hear which causes fight-or-flight reactions. 
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To put decibels in perspective 110 decibels equals a hard rock band while 120 Db equals a jet plane at takeoff. 
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The initial land mitigation was shutting down the turbines at night and higher wind speeds. During litigation acoustic studies showed a setback of 3300 feet was required to residential homes from just one turbine.  After years of litigation, they were removed.
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Massachusetts's past rush to reach land-based wind renewable energy goals failed to include acoustic studies leading to failures.  
The plans around Nantucket include two projects of 62 and 147 turbines around 15 miles southwest. The turbines are 13 megawatts about seven times the size of the onshore turbines.  
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There is no acoustic study of 200 wind turbines concerning residential locations on Nantucket. It's probably assumed that 15 miles is far enough from the project. 
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The speed of sound through the air is around 760 miles per hour and it travels faster in warm air. 
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What happens on a breezy warm summer night with an onshore wind in Nantucket with 200 wind turbines spinning? 
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A qualified acoustician would need to conduct a study to determine the decibels from an offshore wind farm. The surface area around a wind farm grows with the square distance from the source. The formula is called the Inverse Square Law. 
Sources report an acoustic study is taking place at a New Jersey offshore wind project.
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The question should be asked: Who said you won't hear them? 
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Note #
The 15-megawatt turbine sound power level referenced at 115 dBA re 1pW. See link 
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Maine Center For Public Interest Reporting – Three Part Series: A CRITICAL LOOK AT MAINE’S WIND ACT

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(excerpts) From Part 1 – On Maine’s Wind Law “Once the committee passed the wind energy bill on to the full House and Senate, lawmakers there didn’t even debate it. They passed it unanimously and with no discussion. House Majority Leader Hannah Pingree, a Democrat from North Haven, says legislators probably didn’t know how many turbines would be constructed in Maine if the law’s goals were met." . – Maine Center for Public Interest Reporting, August 2010 https://www.pinetreewatchdog.org/wind-power-bandwagon-hits-bumps-in-the-road-3/From Part 2 – On Wind and Oil Yet using wind energy doesn’t lower dependence on imported foreign oil. That’s because the majority of imported oil in Maine is used for heating and transportation. And switching our dependence from foreign oil to Maine-produced electricity isn’t likely to happen very soon, says Bartlett. “Right now, people can’t switch to electric cars and heating – if they did, we’d be in trouble.” So was one of the fundamental premises of the task force false, or at least misleading?" https://www.pinetreewatchdog.org/wind-swept-task-force-set-the-rules/From Part 3 – On Wind-Required New Transmission Lines Finally, the building of enormous, high-voltage transmission lines that the regional electricity system operator says are required to move substantial amounts of wind power to markets south of Maine was never even discussed by the task force – an omission that Mills said will come to haunt the state.“If you try to put 2,500 or 3,000 megawatts in northern or eastern Maine – oh, my god, try to build the transmission!” said Mills. “It’s not just the towers, it’s the lines – that’s when I begin to think that the goal is a little farfetched.” https://www.pinetreewatchdog.org/flaws-in-bill-like-skating-with-dull-skates/

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Hannah Pingree on the Maine expedited wind law

Hannah Pingree - Director of Maine's Office of Innovation and the Future

"Once the committee passed the wind energy bill on to the full House and Senate, lawmakers there didn’t even debate it. They passed it unanimously and with no discussion. House Majority Leader Hannah Pingree, a Democrat from North Haven, says legislators probably didn’t know how many turbines would be constructed in Maine."

https://pinetreewatch.org/wind-power-bandwagon-hits-bumps-in-the-road-3/

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