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GMP Reports Kingdom Wind Sound Levels in Compliance

18 July 2013

COLCHESTER, VT – Sound levels at Kingdom Community Wind are in compliance with standards set by the Vermont Public Service Board (PSB) according to a report Green Mountain Power filed with the PSB today.  

Analysis of 1,343 hours of continuous monitoring conducted between May 22 and June 5 found  that the project did not exceed  PSB standards that require that sound outside nearby homes not exceed 45 decibels, comparable to the background sounds in a library.                

“We are pleased that the report confirms Kingdom Community Wind is operating within the sound limits permitted by the PSB, even during periods of strong winds when all of the turbines are generating electricity,” said Dorothy Schnure, GMP corporate spokesperson. “For most of the testing period, sound levels were well below the maximum level allowed. While some community members can hear the turbines from time to time, the report shows that the sound falls within the range of typical background noise in a rural community.”  

This is the third report of sound monitoring that GMP has filed with the PSB. The testing was conducted at four different locations near the project.  The monitoring records sound when turbines are operating as well as periods when the turbines are shut down in order to accurately differentiate between turbine sound and background sound. Under the monitoring plan approved by the PSB, two different methods are being used to analyze sound levels. An independent third party reviewed the data collected and verified that it was sufficient to make a determination of compliance. By either method of analysis, turbine sound never exceeded the standards at any of the sites.   

Over the three testing periods now complete, data from 6,099 hours of testing show sound levels at Kingdom Community Wind were in compliance 99.96% of the time.  Two earlier reports of sound monitoring showed sound levels slightly exceeded the PSB standard for a total of 4.16 hours, likely due to unusual snow buildup on the turbine blades. To prevent sound from snow buildup in the future, by the fall of 2013 GMP will be installing sophisticated weather monitoring equipment that will more quickly reveal when the conditions are producing snow buildup on the turbines so that generation can be avoided under those conditions. 
 
“We are absolutely committed to meeting the very strict sound standards set by the Public Service Board,” said Schnure. 
 
Under the terms of the CPG issued to Kingdom Community Wind, sound monitoring will occur at four locations for at least a two week period every season for two years.     


Contact: Dorothy Schnure, Green Mountain Power.  Desk: (802) 655-8418, Cell: (802) 324-4418