Wind Energy Feasibility Study - Town Of Orleans

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Wind Energy Facility Economic AnalysisTown of Orleans, MAWeston & Sampson also reviewed the AWS TrueWind Map model of wind speeds for thewatershed location considered in this study. The predicted annual average wind speeds obtainedfrom Mass GIS database, are summarized in Table 2-1 below.Table 2-1: AWS Predicated Wind Speeds (m/s) atVarious Heights Above Ground Level (m)Location 30 m 50 m 70 m 100 mSite 1 5.4 m/s 6.2 m/s 6.8 m/s 7.6 m/sThe AWS TrueWind estimates are useful for site screening and, while they do not replace theaccuracy of site specific anemometry, they are typically considered to be reliable with a 94%factor of confidence.Weston & Sampson also reviewed 3TIER's global wind map, their wind speeds were comparedwith publicly available wind speed observations from more than 4,000 globally distributedmeteorological stations from the National Centers for Environmental Prediction (NCEP)Automated Data Processing (ADP) surface observations dataset.The 3TIER data claims that the difference is less than 0.5 m/s at 50% of the stations, and thedifference is less than 1 m/s at 78% of the stations. The overall bias is +0.05 m/s relative toNCEP ADP observations, and the root mean square error (RMSE) is 0.93 m/s. The 3TIER rangeof wind speeds are summarized in Table 2-2 below:Table 2-2: 3TIER Predicated Range of Wind Speeds (m/s) atVarious Heights Above Ground Level (m)Location 20 m 50 m 80 mSite 1 4.3 - 7.2 m/s 5.3 - 7.5 m/s 5.7 - 7.7 m/sThe data and wind speed values obtained from the on site anemometers was used in this study topredict energy production.7
Wind Energy Facility Economic AnalysisTown of Orleans, MA2.2 Wind Turbine CharacteristicsWeston & Sampson used the raw data collected by RERL and WindPRO® computer modelingsoftware to predict energy production for a 600 kW wind turbine. Based on the measurements atthe MET tower and the wind resource modeling, the wind speed and direction distribution werederived at the selected wind turbine hub height of 65 meters. At a hub height of 65 meters androtor diameter of 48 meters, the overall height of the turbine would be 89 meters or 292 feet,which is below the Determination of No Hazard height of 397 feet issued by the FAA.The wind speed distribution gives the number of hours that a particular wind speed blows peryear. Using WindPRO® modeling software, this wind speed distribution was then combinedwith the power curve of the selected wind turbine to obtain the gross annual wind energyproduction, corrected for availability and electrical grid efficiency to obtain an estimate for thenet annual wind energy production.The model selected for analysis is an Elecon Turbowinds T600-48 wind turbine with duelgenerators (120/600 kW) and a rotor diameter of 48 meters. A summary of the specifications forthe Elecon T600-48 are given in Table 2-3, below:Table 2-3: Elecon T600-48 Turbine SpecificationsTurbine Elecon T600-48Rated Power120/600 kW (Duel)Rotor Diameter48 mHub Height65 mCut-in wind speed3.5 m/sNominal wind speed12.5 m/sCut-out wind speed25 m/sElectrical Generator60 Hz/690V8
Page 1: proposalTown ofMASSACHUSETTSFebruar
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Display lay outs:Screen 1:RPM BLADE
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6 TOWERThe wind generator support s
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Project:Orleans, MA Wind FSDescript
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APPENDIX DMUNICIPAL OWNERSHIP MODEL
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Project Summary• Single 1.65 MW V
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Project Ownership & Financing• Ow
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Pro Forma Economic ResultsBase Case
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Pro Forma Economic Results: BaseSum
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APPENDIX EECONOMIC CALCULATIONSANDP
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ECONOMIC SUMMARYWind Turbine Instal
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Wind Turbine Pro FormaOrleans, MAB
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Wind Energy Feasibility Study - Town Of Orleans

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