Big Thunder Wind Park, Wind Turbine Specifications Report

Transcription

1 October 19, 2012 Nhung Nguyen Horizon Wind Inc. Attention: Reference: Ms. Nhung Nguyen Big Thunder Wind Park, Wind Turbine Specifications Report Dear Ms. Nguyen, We are pleased to present a copy of the Wind Turbine Specifications Report for the Big Thunder Wind Park. This report was prepared to meet the requirements of the Renewable Energy Approval regulations, O. Reg. 359/09, Section 13. It will be included as part of the Renewable Energy Approval Application package to be submitted to the Ministry of the Environment for the Big Thunder Wind Park. Please feel free to contact us if you have any questions or concerns. Sincerely, M. K. INCE AND ASSOCIATES LTD. Martin Ince, P. Eng.

2 Big Thunder Wind Park October 19, 2012 Wind Turbine Specifications Report WIND TURBINE SPECIFICATIONS REPORT The Big Thunder Wind Park is a Class 4 wind facility as defined by O. Reg. 359/09 and as such is required to provide a Wind Turbine Specification Report. As required by the regulations, this report includes the make, model, name plate capacity, hub height above grade, rotational speeds and acoustic emissions data, including the sound power level and frequency spectrum, in terms of octave-band sound power levels, of the turbines to be used in the project. The turbine chosen for the Big Thunder Wind Park is the Enercon E82 turbine. The tables below summarize the required information as per REA requirements. Further information can be found in the appended manufacturer reports. Table 1 Enercon E82 REA Summary REA Specification Information Source Make Enercon Model E-82 E2 Enercon WEC Characteristics E-82 E2 2MW Name Plate Capacity 2.0 MW Enercon WEC Characteristics E-82 E2 2MW Hub Height above grade m Enercon Weights and Dimensions E82/BF/97/20/02 Rotational Speeds 6 18 RPM Enercon WEC Characteristics E-82 E2 2MW Sound Power Level 3.5 db(a) db(a) safety margin Enercon Sound Power Level E-82 E2 Frequency Spectrum See Table 2 below Enercon Sound Power Level E-82 E2, WindPro 2.7 Software, Kotter Consulting Engineers Sound Measurement Report No Table 2 Enercon E-82 Octave Band, 6 m/s referenced to m height (including 1.5 db(a) safety margin) Octave band, center frequency* [Hz] Sum Sound power level [db(a)] *Generic octave band spectra as computed from guaranteed sound level by WindPro 2.7 Software, corresponding to a sum of 5.0 db(a). Data provided by the manufacturer includes octave band sound power levels lower than those specified in Table 2, so the generated levels above are conservative. M.K. Ince and Associates Ltd. 1

3 Big Thunder Wind Park October 19, 2012 Wind Turbine Specifications Report QUALIFICATIONS AND LIMITATIONS M.K. Ince and Associates Ltd. (MKI) have prepared this report in accordance with information provided by its Client. The information and analysis contained herein is for the sole benefit of the Client and may not be relied upon by any other person. The Ministry of Environment can rely on this report. M.K. Ince and Associates Ltd., and the Client understand that this report will be used as part of the Renewable Energy Approval submission. As such, it will be relied upon by various regulators in their review and approval process. The contents of this report are based upon our understanding of information and reports prepared by others, including Horizon Wind Inc. and their consultants. While we may have referred to and made use of this information and reporting, we assume no liability for the accuracy of this information. MKI s assessment was made in accordance with guidelines, regulations and procedures believed to be current at this time. Changes in guidelines, regulations and enforcement policies can occur at any time and such changes could affect the conclusions and recommendations of this report. M.K. Ince and Associates Ltd. 2

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6 Gewichte und Abmessungen Weights and Dimensions E-82/BF/97/20/02 Page 1 of 1 139,38m Windrichtung wind direction 98,38m Sektion 1 Section 1 Gesamthöhe ab Gelände Total height from territory Nabenhöhe ab Gelände Hub height above ground Turmlänge ab Fundamentoberkante Tower height above upper foundation edge Bauart / Design 139,38 m 98,38 m 97, m Stahl / Betonfertigteilturm steel / precast concrete tower Windzone WZ (DIBt) DIBt III 1 WTGS Class (IEC / NVN ) IEC II A 1 Anzahl der Sektionen / Number of sections 2 Stahl / steel 18 Beton / concrete Sektion 2 section 2 Betonsektionen concrete sections Länge length D oben diamt op D unten diam bottom Gewicht weight m m m to Sektion 1 / section 1 25,232 2,00 / 2,21³ 2,91 ca. 38 Sektion 2 / section 2 3,00 2,91 3,019 ca. 16 Betonsektionen / concrete sections 18 x 3,826 3,019 7, ca. 727 GOK Gesamtgewicht Turm / total weight tower ca Typenprüfung vorhanden /Certification Report available 2 Typenprüfung in Arbeit/ Certification report in process 3 Flanschaußendurchmesser / outside flange diameter! Dieses Dokument wurde auf Anfrage bzw. für einen bestimmten Auftrag verschickt. Der Empfänger wurde nicht registriert! Der Empfänger wird bei Änderung des Dokuments nicht automatisch informiert! This document has been send on request on a certain order. The receiver has not been registered! The receiver will not automatically be informed in case of alterations! Document information: Author/ date: Department: Approved / date: Revision / date: AS / WRD MKR / Translator / date: Revisor / date: Reference: - AS /..06 WRD-K-04-GuA.E-82.BF Rev01_0-gereng.doc

7 Sound Power Level E-82 E2 Page 1 of 3 Sound Power Level of the ENERCON E-82 E2 Operational Mode 2000 kw (Data Sheet) Imprint Editor: Telephone: Fax: Copyright: Updates: Revision Revision: 1.0 Department: ENERCON GmbH Dreekamp Aurich Germany Unless otherwise specified in this document, the contents of this document are protected by copyright of ENERCON GmbH. All rights reserved. No use, including any copying or publishing, of this information is permitted without the prior written consent of ENERCON GmbH. ENERCON GmbH reserves the right to continuously update and modify this document and the items described therein at any time without prior notice. ENERCON GmbH / Site Assessment Glossary WEC WECs means an ENERCON wind energy converter. means more than one ENERCON wind energy converter. Document information: Author/Revisor/ date: Approved / date: Revision /date: Sch/ MK/ 04/ / April 20 Documentname Copyright ENERCON GmbH. All rights reserved. SIAS-04-SPL E-82 E2 2MW Rev1_0-eng-eng.doc

8 Sound Power Level E-82 E2 Page 2 of 3 Sound Power Level for the E-82 E2 with 2000 kw rated power in relation to wind speed at m height hub height V s in m height 78 m 85 m 98 m 8 m 138 m 5 m/s 96,3 db(a) 96.6 db(a) 97.2 db(a) 97.5 db(a) 98.2 db(a) 6 m/s 0.7 db(a) 1.0 db(a) 1.6 db(a) 1.9 db(a) 2.6 db(a) 7 m/s 3.3 db(a) 3.5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 8 m/s 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 9 m/s 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) m/s 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 95% rated power 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) 3,5 db(a) Measured value at 95% rated power 2,5 db(a) KCE in relation to wind speed in hub height wind speed at hub height [m/s] Sound Power Level [db(a)] The relation between the sound power level and the standardized wind speed in m height as shown above is valid on the premise of a logarithmic wind profile with a roughness length of 0.05 m. The relation between the sound power level and the wind speed at hub height applies for all hub heights. During the sound measurements the wind speeds are derived from the power output and the power curve of the WEC. 2. A tonal audibility of ΔL a,k 2 db can be expected over the whole operational range (valid in the near vicinity of the turbine according to IEC ed. 2). 3. The sound power level values given in the table are valid for the Operational Mode 2000 kw (defined via the rotational speed range of 6 17,5 rpm). The respective power curve is the calculated power curve E-82 E2 2MW dated November 2009 (Rev. 3.x). 4. The values displayed in the tables above are based on official and internal measurements of the sound power level. If available the official measured values are given in this document as a Document information: Author/Revisor/ date: Approved / date: Revision /date: Sch/ MK/ 04/ / April 20 Documentname Copyright ENERCON GmbH. All rights reserved. SIAS-04-SPL E-82 E2 2MW Rev1_0-eng-eng.doc

9 Sound Power Level E-82 E2 Page 3 of 3 reference (in italic print). The extracts of the official measurements can be made available upon request. The values given in the measurement extracts do not replace the values given in this document. All measurements have been carried out according to the recommended German and international standards and guidelines as defined in the measurement reports, respectively. 5. Due to the typical measurement uncertainties, if the sound power level is measured according to one of the accepted methods the measured values can differ from the values shown in this document in the range of +/- 1 db. Accepted measurement methods are: a) IEC ed. 2 ( Wind turbine generator systems Part 11: Acoustic noise measurement techniques; Second edition, ), and b) the FGW-Guidelines ( Technische Richtlinie für Windenergieanlagen Teil 1: Bestimmung der Schallemissionswerte, published by the association Fördergesellschaft für Windenergie e.v., 18 th revision). If the difference between total noise and background noise during a measurement is less than 6 db a higher uncertainty must be considered. 6. For noise-sensitive sites it is possible to operate the E-82 E2 with reduced rotational speed and reduced rated power during night time. The sound power levels resulting from such operational mode can be provided in a separate document upon request. 7. The sound power level of a wind turbine depends on several factors such as but not limited to regular maintenance and day-to-day operation in compliance with the manufacturer s operating instructions. Therefore, this data sheet can not, and is not intended to, constitute an express or implied warranty towards the customer that the E-82 E2 WEC will meet the exact sound power level values as shown in this document at any project specific site. Document information: Author/Revisor/ date: Approved / date: Revision /date: Sch/ MK/ 04/ / April 20 Documentname Copyright ENERCON GmbH. All rights reserved. SIAS-04-SPL E-82 E2 2MW Rev1_0-eng-eng.doc

10 SOUND MEASUREMENT REPORT NO regarding the determination of sound emissions of a Enercon E-82 E2 type wind turbine generator in the Fiebing wind farm near Großefehn in operational mode 2,000 kw Date: Client: Enercon GmbH Dreekamp Aurich Processors: Dipl.-Ing. Jürgen Weinheimer Dipl.-Ing. Oliver Bunk KÖTTER Consulting Engineers KG Bonifatiusstraße 400 D Rheine Tel Fax

11 Page 2 of the sound measurement report no ) Summary On the sound emissions of a Enercon E-82 E2 type wind turbine generator (WTG) with 2.3 MW rated power installed near Großefehn were measured. This is the WTG No. 12 of the Fiebing wind farm. The wind speed range of v s = 5 m/s to m/s was investigated in the operation at the rated power of P nom = 2,000kW (abbreviation: "operational mode 2,000 kw"). The maximum sound power of L WA = 2.5 db(a) was determined for the standardised wind speed v s = 8 m/s. The WTG noises were not relevant subjectively with regard to tonal components within the wind speed ranges investigated. The arithmetical maximum tonal perceptibility is ΔL a,k = 0.0 db in the 9 m/s wind class, i.e. tonal components are barely perceptible. The turbine noises had no impulsive components according to the subjective aural perception. There were no other immission-relevant, acoustic abnormalities (yaw drive, exhaust noises, etc.) during the measurement period. This report has been generated with the greatest care and with the most stringent conscientiousness. * This report is comprised of 28 pages as well as six appendices. Rheine, JW / BB KÖTTER Consulting Engineers KG p.p. Dipl.-Ing. Oliver Bunk p.p. Dipl.-Ing. Jürgen Weinheimer * The client is authorised to pass on data or information. Only documents bearing the original signature are authentic. Please consult the respectively applicable KCE consultation conditions with regard to copyright.

12 Page 3 of the sound measurement report no TABLE OF CONTENTS 1.) Summary 2 2.) Situation and Task 4 3.) Processing based on the following fundamentals 5 4.) Measurement record 7 5.) Result of airborne sound measurement Sound pressure level at the reference measuring point Tonal components within close range Impulsive components Directional characteristics Sound power level Converting sound power level to other hub heights 24 6.) Measurement uncertainty 26 7.) Appendix 28

13 Page 4 of the sound measurement report no ) Situation and Task On the Fiebing wind farm near Großefehn alongside wind turbines of various types, there is a Enercon E-82 E2 type wind turbine with a rotor diameter of 82 m and a hub height of 8 m. On behalf of the Enercon GmbH the sound power level is to be determined for wind turbine no. 12 of the wind farm in the operational mode 2,000 kw at a reduced rated power of P nom = 2,000 kw IEC-compliant (i.e. compliant with the German version [1] of the international standard IEC : A1:2006). Furthermore, the WTG is to be monitored for tonal and impulsive components at close range. The sound power level is to be converted for 4 additional hub heights as well. The results are to be documented as a sound measurement report.

14 Page 5 of the sound measurement report no ) Processing based on the following fundamentals The following standards, directives and documents were used for determining sound emissions: [1] DIN EN , Wind turbine generator systems Part 11: Acoustic noise measurement techniques; March, 2007 edition [2] IEC , Wind turbine generator systems - Part 11: Acoustic noise measurement techniques, Second edition [3] Amendment 1 to IEC Ed. 2: Wind turbine generator systems Part 11: Acoustic noise measurement techniques, 2006 [4] DIN EN , Wind turbine generator systems, Part 12: Measurement technique for determining performance of wind turbines; July, 1999 edition [5] DIN , Determination of rating levels from measurement data, Part 1: Noise immissions in the neighbourhood; July, 1996 [6] DIN 45681, Acoustics Determination of tonal components of noise and determination of a tone adjustment for the assessment of noise immissions; March, 2005 edition [7] DIN 45681, Acoustics Determination of tonal components of noise and determination of a tone adjustment for the assessment of noise immissions; Corrections to DIN 45681: [8] Fördergesellschaft Windenergie e. V. [Non-profit wind-energy development fund]: Technical Guidelines for Wind Turbines, 18 th revision, Status: , Part 1: Determination of Noise Emission Values [9] Characteristic power curve of the E-82 E2 type WTG, calculated by Enercon GmbH on and manufacturer's certification of regarding specific data of the E-82 E2 type facility measured, made available by Enercon GmbH

15 Page 6 of the sound measurement report no [] Acoustical round robin test by the LANUV NRW (formerly LUA NRW) in Essen, Mr. D. Piorr (Dipl.-Ing.), on noise emission measurement at wind turbine generator systems, November 2000 (KÖTTER Consulting Engineers KG (KCE) participated in the roundrobin testing) [11] Notes on noise immission protection for wind turbine generator systems, recommendations by the state committee for immission protection (LAI), March 2005

16 Page 7 of the sound measurement report no ) Measurement record Task: Measurement of the turbine-related noise emissions of a E-82 E2 (2.3 MW) type wind turbine near Großefehn. Measurement during operational mode 2,000 kw at a reduced rated power of P nom = 2,000 kw. Measuring points: First reference measuring point at 126 m distance to the rotor level on a reverberation wooden plate 1 m in diameter in wind direction northeast of the WTG, unrestricted spread conditions. Second reference measuring point as of approx. 15:22 due to changed wind direction at the same distance east of the WTG. Ground conditions surrounding the plate: Meadow with crusted leftover snow, frozen ground. The location of the sound measuring points can be viewed on the map of the area in Appendix A. Wind measuring point: In crosswind direction at 140 m from the WTG measured. Position and distance deviate from [1]. Reason: Due to the position, the wind measuring point moves closer to the sound measuring point and the correlation between noise pressure and wind speed when switching off the WTG increases. The distance was also shortened due to the impassable ground (snow and ice, meadow fences). The location of the wind measuring point can be viewed on the map of the area in Appendix A. Date/Time: , 12:05-17:18 Measurement device time was synchronised with the WTG time. Measurement personnel: Dipl.-Ing. Jürgen Weinheimer (KCE) Markus Niehues (KCE)

17 Page 8 of the sound measurement report no Installation description: Type: E-82 E2 Serial No.: Manufacturer: Enercon GmbH Hub height above ground: 8 m Rotor diameter: 82 m Distance between rotor flange centre tower centre line: 4.6 m Rated power: 2,000 kw (reduced, installed 2.3 MW) Rotor speed: 17.5 RPM (operational mode 2,000 kw) Power regulation: Pitch For further specific information on the WTG, please consult the manufacturer certification (see Appendix E). Location: The wind turbine generator is located near Großefehn on the Fiebing wind farm. There are numerous other WTGs on the wind farm. Location coordinates: GK RW: GK HW:

18 Page 9 of the sound measurement report no Operational modes: Measurement device times and operational modes: 12:05 to 12:31: WTG switched off 12:40 to 12:59: operational mode 2,000 kw measurement break 13:22 to 13:27: operational mode 2,000 kw measurement break 13:40 to 13:42: operational mode 2,000 kw measurement break 14:33 to 14:55: WTG switched off measurement break 16:08 to 16:: WTG switched off measurement break 16:42 to 17:05: operational mode 2,000 kw 17:07 to 17:18: WTG switched off The closest WTG Nos. 13 and 14 of the E-82 E2 type were not in operation during the measurement period. Other WTGs at a distance of > 0 m were in operation. Particularity(-ies) of the WTG measured: The maximum electrical performance attained by the WTG at P m = 2,052 kw was greater than the rated power indicated by the manufacturer. The validity of the sound power measured is not influenced by this. This is because the entire operational range of the WTG in relation to performance and rotor speed was registered by the measurement. 95 % of the rated power refers to the manufacturer's data on rated power at P nom = 2,000 kw, s. chapter 5.

19 Page of the sound measurement report no Meteorological conditions: Temperature (mean value): 2.8 C (ground value for air density correction) Air pressure (mean value): 991 hpa (ground value for air density correction) Wind speed v : 2 to 14 m/s from a southwesterly direction, later a westerly direction (value in seconds, anemometer at m height) Cloud cover/precipitation: 7/8 cloud cover, meadow with crusted leftover snow, frozen ground Background noise: Measurement values with temporary background noise (vehicles, aircraft, etc.) were not included in the evaluation (see also second plot in Appendix B). Measurement values with continuously dominant ambient sound (e.g. windinduced sound due to plant cover) were taken into consideration. Measurement devices: The sound level meter was calibrated before and after the measurement. There was no deviation.

20 Page 11 of the sound measurement report no Device Manufacturer Type Serial No. Precision sound level meter Omnidirectional condensor microphone Official calibration (E) until or calibration (K) in Norsonic Nor (E) 20 Norsonic (E) 20 Preamplifier Norsonic (E) 20 Calibrator Norsonic (E) 20 Measurement system (8 channel) IMC Cronos-PL Half, primary wind screen Brüel & Kjaer UA Secondary wind screen KCE Range finder Leica LRF Anemometer Climatic measurement device Measurement software Signal analysis software Thies CLIMA (K) 2009 Airflow THB IMC IMC imc Devices, V 2.6 Famos signal analysis, version 6.0 rev Recording electrical power, rotor speed and nacelle wind speed Interface Interface of the Enercon GmbH with direct voltage signals of power, rotor speed and nacelle wind speed. Power measurement not compliant with [1] (with electrical effective power converter), Reason: Power measurement via interface is tested by the manufacturer and the KÖTTER Consulting Engineers KG and the signals of rotor speed and nacelle wind are provided by the interface. In addition, random measurement of rotor speed via counting procedure as well as plausibility testing of all measurement data recorded.

21 Page 12 of the sound measurement report no ) Result of airborne sound measurement 5.1. Sound pressure level at the reference measuring point The following procedure is in compliance with the regulations of DIN EN [1]. To determine the sound pressure level, the microphone was attached according to [1] to a reverberation plate. The following schematic sketch illustrates the position of the microphone, referred to as reference measuring point RMP, with regard to the wind turbine generator. e D R 1 H RMP R 0 = H + D/2 S = R 0 + e Figure 1: Schematic diagram of position of reference measuring point

22 Page 13 of the sound measurement report no D = Rotor diameter H = Hub height e = Distance of rotor flange centre tower centre line RMP = Reference Measuring Point (microphone) R 0 = horizontal distance from tower centre line to RMP S = horizontal distance from rotor flange centre to RMP R 1 = diagonal distance from rotor flange centre to RMP The horizontal distance S from the rotor level is usually comprised of the hub height H, the rotor radius D/2 and the rotor distance e to the tower centre line. The proportion of R 0 of S, consisting of hub height and rotor radius, is equivalent to the distance of the tower centre line to the RMP and can be extended or shortened by up to 20% with respect to the standard length. It was shortened by 19% in this case in order to increase the signalto-noise ratio. This yielded a distance of S = 126 m. During the measurement the average sound pressure levels L AFeq and the takt maximum sound level L AFTeq (cycle time: 5 s) are recorded. Mean values are attained and evaluated based on the measured level, power and wind speed values which comprise at least 1 minute in accordance with [1]. Minute mean values are selected in this evaluation. The required range of standardised wind speed of v s = 6 m/s up to v s = m/s is thus completely covered and the 5 m/s is recorded, part of the range desired by the client v s = 3 m/s to v s = 5 m/s. In an initial evaluatory step, figure 2 displays the sound pressure level L Aeq at the reference measuring point with respect to the electrical power P m of the WTG.

23 Page 14 of the sound measurement report no WTG type E-82 E2, Ser. No , operational mode 2,000 kw: sound pressure level at reference test point Sound pressure level LAeq [db(a)] Electric power P m [kw] WTG > 95% P WTG <= 95% P Figure 2: Sound pressure level at the reference measuring point vs. electrical power (minute mean values) The diagram shows that a power range of approx. 600 kw up to and beyond the rated power of 2,000 kw is covered and that the total noise level increases as power increases. In accordance with [1] the noise pressure level is to be considered as of a standardised wind speed of v s = 6 m/s up to v s = m/s at a height of m. Each BIN (= wind class) is to have 3 minutes measurement time during line operation and switching off in order to fulfil the requirements in accordance with [1]. The standardised wind speed v s at m height is determined, in accordance with [1], during line operation up to 95 % of rated power (in this case P m,95% = 1,900 kw) from the electrical active power. 95 % of rated power is produced with the related characteristic performance curve at the reference wind speed of v s = 7.9 m/s.

24 Page 15 of the sound measurement report no Via the performance curves provided based on the data recorded on the electrical active power, the wind speed at hub height is determined. These values are corrected concerning the atmospheric pressure according to [1] and converted as follows, assuming a logarithmic wind profile with a roughness length of z 0 = 0.05 m to a reference height of m: v s = v H ln ln z 0ref H z 0ref v s standardised wind speed at m height v H wind speed at the height of the rotor centre z 0ref reference roughness length of 0.05 m H height of the rotor centre (here: H = 8 m) Because 95 % of the rated power is exceeded below v s = m/s, the standardised wind speed above v s,95% is determined using directly measured wind speed. This is either the wind speed v measured at m height that is to be corrected with the correction factor κ or it is the wind speed v n measured with the WTG nacelle anemometer, that is to be corrected. In this case, the nacelle anemometer method is used due to its greater precision. To do so, a linear regression is generated from the wind speed of the nacelle anemometer v n measured during WTG operation and performance values of 5-95 % of the rated power and the corrected wind speed at hub height v H, determined via performance (s. figure 3).

25 Page 16 of the sound measurement report no Wind speed vh [m/s] WTG type E-82 E2, Ser. No , operational mode 2,000 kw: corrected wind speed at hub height as a function of wind speed from the nacelle anemometer y = 0,9954x + 0, Wind speed v n [m/s] Figure 3: Linear regression based on nacelle anemometer values v n and wind speeds at hub height v H (minute mean values) The regression yields 2 coefficients: c 1 and c 2. The linear equation for the WTG investigated is as follows: v H = c 1 v n + c 2 = 1.00 v n v n nacelle anemometer wind speed v H wind speed at hub height calculated and corrected based on power (= height of rotor centre) In accordance with the linear equation, standardised values are calculated from the nacelle anemometer values and used for evaluation. For the determination of the standardised wind speed without line operation (background noise measurement) the values measured with the anemometer at m height are made use of and corrected over the correction factor κ.

26 Page 17 of the sound measurement report no The WTG investigated yielded the following value: κ = v s / v = 1.02 v s average standardised wind speed v average wind speed measured via anemometer at m height Both mean values (v s, v ) originate from the same measurement periods. The difference between the mean values v s and v (from mean minute values) of 2% is due to the deviation between expected and actual ground roughness. The following figure 4 shows the sound pressure level L Aeq at the reference measuring point dependent on the wind speed v s. It also contains the corresponding regression analyses and related equations. Sound pressure level LAeq [db(a)] WTG type E-82 E2, Ser. No , operational mode 2,000 kw: sound pressure level at reference test point y = -0, x 4 + 0, x 3-4,0366x ,9818x - 22,47 y = 1,1445x + 36, Standardised wind speed v s [m/s] WTG <= 95% P WTG > 95% P Backgr. noise 3- m/s Backgr. noise > m/s Figure 4: Sound pressure level at the reference measuring point over standardised wind speed at m height for WTG operation and background noise

27 Page 18 of the sound measurement report no A polynomial regression of the 4 th order is selected corresponding to the correlation coefficients calculated here R = 0.91 > 0.8 for the line operation data. The regression takes place for standardised wind speeds of v s = 5 m/s to v s = m/s. The 5 m/s wind class deviates from [1] and is included in the regression as the client would also like to have the sound power determined for the low wind speeds of v s = 3 m/s to v s = 5 m/s, inasmuch the measurement values permit this. What continues to be noticeable is a relatively high scattering of the background noise levels in the lower wind speed range and a relatively significant rise of the background noise level as wind speed increases, which is due to the neighbouring WTG of the wind farm being in operation. There is not, as proscribed in [1] at least one value present on both sides of the class median in the wind classes of 5 m/s, 7 m/s, 8 m/s and m/s. In order to monitor for a possible influence upon measurement values due to this kind of imprecision, a corresponding diagram is inserted here showing an evaluation in -second mean values. WTG type E-82 E2, Ser. No , operational mode 2,000 kw: sound pressure level at reference test point Sound pressure level LAeq [db(a)] y = 0, x 4-0, x 3 + 7,941899x 2-26,9558x + 73,32 y = 1,1200x + 36, Standardised wind speed v s [m/s] WTG <= 95% P WTG > 95% P Backgr. noise 3- m/s Backgr. noise > m/s Figure 5: Sound pressure level at the reference measuring point over standardised wind speed at m height for WTG operation and background noise (-second mean values)

28 Page 19 of the sound measurement report no When one compares figure 5 and figure 4, one comes to the conclusion that in all wind classes measured, with the exception of m/s, the fragmentary nature of the points of data in the minute evaluation does not lead to a significantly different results and is thus not disadvantageous. There are only points of data up to the class median in the m/s wind class due to weather conditions. The mean minute value evaluation is continued. Furthermore, what is noticeable in both diagrams, figures 4 and 5, is a relatively high amount of scattering of sound level values during WTG operation of v s = 8 m/s, which is due to the alternating aerodynamic noises from the rotor. At times these noises were perceptible as a (quieter) hissing sound, at times as a (louder) whooshing. The high scatter in this maximum-sound-power-level wind class, results in a relatively high measurement uncertainty of U C = 2.2 db, s. chapter 5.6. Table 1 lists the sound pressure levels determined from the 4 th order during WTG operation (L s+n ) as well as from the linear regression regarding background noises (L n ) (s. figure 4). In addition, the distances ΔL s+n,n between WTG and background noise along with the background-noise-corrected levels L Aeq,c are listed. v s [m/s] 5 1) No. of values: WTG on / off 7 / 5 / 6 6 / 4 3 / 6 12 / 6 3 / 4 L s+n [db(a)] L n [db(a)] ΔL s+n,n [db] L Aeq,c [db(a)] ) Lowest standardised wind speed measured, v s = 5.02 m/s Table 1: Emission data of the E-82 E2 type WTG from the 4 th order regression (WTG operation) and from the 1 st order regression (background noise)

29 Page 20 of the sound measurement report no The time series of the sound pressure level, the electrical power, the rotor speed, the nacelle anemometer wind speed and the anemometer wind speed at m height and the wind direction (via remote monitoring) are listed in Appendix B. Furthermore, a scatter plot of the mean average values of the rotor speed over the electrical power is shown in Appendix D. Mean values of the rotor speed to each wind speed BIN, calculated from a polynomial 4 th order regression are shown in table 4. The turbulence intensity is determined from three -minute intervals of wind-speed measurement. It amounts to an average of 26 % Tonal components within close range Tonal components analysis takes place for the close range of the WTG based on noise acquisition at the reference measuring point. Using the measurement data recording system Cronos-PL3 narrow-band frequency spectra with a lineal width of Δ f = 4 Hz were generated during measurement using a Hanning window for the WTG and the background noise. The evaluation will be used as per [1]. The entire frequency range in s narrow-band frequency spectra is examined in which the tonal frequencies occurred during the measurement which were certainly or possibly caused by the WTG, at least within the frequency range of 0 to 1,600 Hz. For each BIN there are 12 frequency spectra (correspondingly 2 minutes) of WTG operation and WTG switching off to be investigated, which are located most closely to the whole-number BIN value of the standardised wind speed. The results of the tonal components analysis are summarised in table 2. The frequencies indicated there are those resulting in values ΔL a,k 3.0 db.

30 Page 21 of the sound measurement report no v s [m/s] 5 1) f T [Hz] ΔL a,k [db] < -3.0 < ) ) Lowest standardised wind speed measured, v s = 5.02 m/s Table 2: Tonal components within close range The computational evaluation according to [1] results in the maximum tonal perceptibility of ΔL a,k = 0.0 db upon a wind speed of v s = 9 m/s; i.e. the tone is barely perceptible. In the remaining wind classes the tonal perceptibility is below zero or no tonal frequency is detected, in the 5 m/s and 6 m/s BIN. The individual spectra of the 0 1,600 Hz frequency range as well as detailed calculation results can be viewed in Appendix C. This also contains information on results with ΔL a,k < 3.0 db which do not have to be documented according to [1]. According to the subjective aural impression during the measurement period, the WTG had slightly tonal components at times within close range, comparable to a low hum. The tonal component was only perceptible upon listening very closely and so minimal, such that no tonal component was assigned subjectively. These weak tonal components did not occur in the far field (approx. 0 m distance) during an aural trial from approx. 14:00 to 14:15. Tonal components determined within close range cannot necessarily be directly transferred to the far field Impulsive components According to the subjective aural impression during the measurement period, there were no tonal components present within close range. An aural trial at more distant range did not yield any impulsive components either. The blade passage frequency was not noticeable. Table 3 displays the impulsive component results.

31 Page 22 of the sound measurement report no v s [m/s] K IN [db] Table 3: Impulsive components within close range 5.4. Directional characteristics Via subjective aural impression, the sound emission of the WTG was investigated in various directions during an on-site visit in close range with the WTG in operation. The throbbing of the rotor blades was more clearly audible against the wind and with crosswinds according to subjective aural impression but not louder Sound power level The immission-relevant sound-power level L WA is determined in accordance with [1] as follows from the background-noise-corrected sound pressure level L Aeq,c at reference measuring point: L WA = L Aeq,c R1² 6 + lg 4π S0 R 1 distance between rotor centre and microphone (s. graphic at beginning of chapter 5, determined from: S H R = + with S microphone distance to rotor level H hub height (here: R 1 = 166 m) S 0 datum face (S 0 = 1 m²)

32 Page 23 of the sound measurement report no The 6 db constant in the above equation considers the increase in sound pressure level on a reverberation plate. Non-acoustic parameters (P m = electrical power, n Rot = rotor speed) as well as sound pressure levels L s+n, L n, L Aeq,c, tonal components ΔL a,k, impulsive allowances K IN and sound power level L WA for the available standardised wind speeds v s are indicated in table 4. v s [m/s] 5 1) P m [kw], mean Limits from - to 589 ( ) 1,077 (826 1,339) 1,605 (1,339 1,800) 1,925 2,000 2,000 n Rot [min -1 ] L s+n [db(a)] L n [db(a)] ΔL s+n,n [db] 2) L Aeq,c [db(a)] ΔL a,k [db] < -3.0 < ) K IN [db] L WA [db(a)] * 1) Lowest standardised wind speed measured, v s = 5.02 m/s 2) Differences in rounding off result from decimal place data *) signal-to-noise ratio ΔL s+n,n < 6 db, background noise correction of 1.3 db Table 4: Non-acoustic and acoustic parameters of the no. 12 E-82 E2 type WTG on the Fiebing wind farm near Großefehn The maximum sound power is determined for the standardised wind speed v s = 8 m/s with L WA = 2.5 db(a). The WTG noises contained at times weak tonal components (in low frequency range of f = Hz, with a maximum tonal perceptibility of L a,k = 0.0 db in the 9 m/s wind class) and contained no impulsive components. There were no other immission-relevant, acoustic abnormalities (yaw drive, exhaust noises, etc.) during the measurement period.

33 Page 24 of the sound measurement report no All evaluation results refer to the measured wind turbine, based on the computed characteristic power curve indicated in Appendix E. A slightly increased measurement uncertainty must be considered compared with a measured power curve, s. chapter 5.6, proportion U B7. The power curve was made available especially for the WTG measured and its mode of operation. Upon the wish of the client, the sound power levels are also calculated resulting from even-numbered standardised wind speeds at hub height. Table 5 displays the results. v H,n [m/s] L WA [db(a)] Table 5: Sound power levels of the E-82 E2 WTG no. 12 in the Fiebing wind farm near Großefehn regarding wind speed at hub height at the operational mode 2,000 kw 5.6. Converting sound power level to other hub heights In the context of sound power level and standardised wind speed, the sound power is converted to other hub heights, with the same tower structure and the same type of facility, in accordance with the method described in [8]. Table 6 displays the results, including the measured hub height H = 8 m.

34 Page 25 of the sound measurement report no Hub height H = 78 m v s [m/s] L WA [db(a)] Hub height H = 85 m v s [m/s] L WA [db(a)] Hub height H = 98 m v s [m/s] L WA [db(a)] Hub height H = 8 m v s [m/s] ) L WA [db(a)] * Hub height H = 138 m v s [m/s] L WA [db(a)] ) Lowest standardised wind speed measured, v s = 5.02 m/s Table 6: Sound power level converted to various hub heights

35 Page 26 of the sound measurement report no ) Measurement uncertainty Besides the applied measuring instruments' precision, measuring accuracy is influenced by meteorological conditions and wind spread as well as by the indicated performance curve. Measurement uncertainty is calculated according to [1]. Based on the individual measurement uncertainties, this yields the following total measurement uncertainty, which is the measurement uncertainty for calculating the sound power level: C 2 A 2 B1 U = U + U U 2 B9 The measurement uncertainty of the maximum sound power is the decisive measurement uncertainty sought. It occurs in the wind speed BIN of v s = 8 m/s. Taking the measured mean minute values and the regression analysis for the sound power level (4 th order) a statistical error is calculated for the sound power level in the wind speed BIN of v s = 8 m/s of U A = 2.0 db. Further measurement uncertainties are estimated according to the values indicated in table 7. The uncertainty of power measurement is included in determination of the standardised wind speed.

36 Page 27 of the sound measurement report no Error sources Designation Measurement uncertainty [db] Acoustic calibrator U B1 0.2 Sound level meter U B2 0.2 Reverberation plate U B3 0.3 Measuring distance U B4 0.1 Air impedance U B5 0.1 Turbulence U B6 0.4 Wind speed U B7 0.4 Direction U B8 0.5 Background noises U B9 0.4 Table 7: Estimated measurement uncertainty U B The total measurement uncertainty is thus U C = +/- 2.2 db.

37 Page 28 of the sound measurement report no ) Appendix Appendix A: Photos and site plan Appendix B: Diagrams of the time series Appendix C: Frequency spectra and tonal components Appendix D: Further measurement results Appendix E: Characteristic power curve and manufacturer certification of E-82 E2 at Großefehn location Appendix F: Extract from the test report

38 Appendix A: Photos and site plan

39 Microphone f Photo 1: Microphone at initial reference measuring point towards the E-82 E2 (Großefehn location)

40 Photo 2: Microphone at initial reference measuring point (Großefehn location)

41 Microphone Photo 3: Microphone at later reference measuring point towards the E-82 E2 (Großefehn location)

42 Photo 4: Microphone at later reference measuring point (Großefehn location)

43 Photo 5: E-82 E2 viewed from anemometer (Großefehn location)

44

45 Appendix B: Diagrams of the time series

46 WTG E-82 E2, No , working modes during the measurement (3) Mode 2 MW (1) Switching off 4 Working mode :00 12: 13:00 13: 14:00 14: 15:00 15: 16:00 16: 17:00 17: ean values) Time [h:min] tor en fonction du temps (valeurs moyennes des minutes) nt mesurée par l'anémomètre de nacelle en fonction du temps (deuxième valeurs moyennes) Time behaviour of sound pressure level (one-minute mean values without temporary background noises) 56 Sound pressure level LAeq [db(a)] :00 12: 13:00 13: 14:00 14: 15:00 15: 16:00 16: 17:00 17: Time [h:min] Project , established by J. Weinheimer, 01/31/2011 / E-Rohdn_ _2002_2MW_engl.xls\Logger

47 WTG E-82 E2, No , working mode 2 MW: Time behaviour of electric power (one-second mean values) Power P m [kw] :00 12: 13:00 13: 14:00 14: 15:00 15: 16:00 16: 17:00 17: Time [h:min] WTG E-82 E2, No , working mode 2 MW: Time behaviour of rotor speed (one-minute mean values) Rotor speed n Rot [rpm] :00 12: 13:00 13: 14:00 14: 15:00 15: 16:00 16: 17:00 17: Time [h:min] Project , established by J. Weinheimer, 01/31/2011 / E-Rohdn_ _2002_2MW_engl.xls\Logger

48 WTG E-82 E2, No , working mode 2 MW: Time behaviour of nacelle wind speed (one-second mean values) Nacelle wind speed v n [m/s] :00 12: 13:00 13: 14:00 14: 15:00 15: 16:00 16: 17:00 17: Time [h:min] Test point for wind speed of m Height: Time behaviour of anemometer wind speed (one-second mean values) 16 Anemometer wind speed v [m/s] :00 12: 13:00 13: 14:00 14: 15:00 15: 16:00 16: 17:00 17: Time [h:min] Project , established by J. Weinheimer, 01/31/2011 / E-Rohdn_ _2002_2MW_engl.xls\Logger

49 Nacelle position absolute, according to wind direction, one-minute mean values from the remote monitoring Angle [ ] :00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 Time [h:min] Project , edited by J. Weinheimer, 7/29/20, 4 Diagramm 1

50 Insertion loss through primary and secondary wind screen ,000 5,000 6,0 8,000, ,000 1,2 1,600 2,000 2,0 3,1 Insertion loss [db] Frequency [Hz] Project , edited by J. Weinheimer, 7/29/20 De_Windschirme Diagramm 1

51 Appendix C: Frequency spectra and tonal components

52 Noise emission measurement of E-82 E2 at wind-farm Fiebing, Ser. No , Mode 2 MW third-octave band sound pressure level for v s = 5 m/s L p,terz [db(a)] L p,okt [db(a)] * * 60.6* L p [db(a)] L p [db(a)] Third-octave band sound pressure level Octave band sound pressure level Gesamt total total 47.4 * difference between working noise and background noise < 6 db, level correction by 1.3 db ** difference between working noise and background noise < 3 db, no level correction KÖTTER Consulting Engineers KG, Bonifatiusstraße 400, Rheine, Tel , Fax , koetter@koetter-consulting.com, Project , edited by J. Weinheimer, 8/2/20 Terz_2MW_ xls\IEC-Terzspektrum2-5

53 Noise emission measurement of E-82 E2 at wind-farm Fiebing, Ser. No , Mode 2 MW third-octave band sound pressure level for v s = 6 m/s L p,terz [db(a)] L p,okt [db(a)] * ** * * * L p [db(a)] L p [db(a)] Third-octave band sound pressure level Octave band sound pressure level Gesamt total total.8 * difference between working noise and background noise < 6 db, level correction by 1.3 db ** difference between working noise and background noise < 3 db, no level correction KÖTTER Consulting Engineers KG, Bonifatiusstraße 400, Rheine, Tel , Fax , koetter@koetter-consulting.com, Project , edited by J. Weinheimer, 8/2/20 Terz_2MW_ xls\IEC-Terzspektrum2-6

54 Noise emission measurement of E-82 E2 at wind-farm Fiebing, Ser. No , Mode 2 MW third-octave band sound pressure level for v s = 7 m/s L p,terz [db(a)] L p,okt [db(a)] * * * ** * * * * * * L p [db(a)] L p [db(a)] Third-octave band sound pressure level Octave band sound pressure level Gesamt total total 52.5 * difference between working noise and background noise < 6 db, level correction by 1.3 db ** difference between working noise and background noise < 3 db, no level correction KÖTTER Consulting Engineers KG, Bonifatiusstraße 400, Rheine, Tel , Fax , koetter@koetter-consulting.com, Project , edited by J. Weinheimer, 8/2/20 Terz_2MW_ xls\IEC-Terzspektrum2-7

55 Noise emission measurement of E-82 E2 at wind-farm Fiebing, Ser. No , Mode 2 MW third-octave band sound pressure level for v s = 8 m/s L p,terz [db(a)] L p,okt [db(a)] * * * * L p [db(a)] L p [db(a)] Third-octave band sound pressure level Octave band sound pressure level Gesamt total total 53.1 * difference between working noise and background noise < 6 db, level correction by 1.3 db ** difference between working noise and background noise < 3 db, no level correction KÖTTER Consulting Engineers KG, Bonifatiusstraße 400, Rheine, Tel , Fax , koetter@koetter-consulting.com, Project , edited by J. Weinheimer, 8/2/20 Terz_2MW_ xls\IEC-Terzspektrum2-8

56 Noise emission measurement of E-82 E2 at wind-farm Fiebing, Ser. No , Mode 2 MW third-octave band sound pressure level for v s = 9 m/s L p,terz [db(a)] L p,okt [db(a)] ** * * 25.9* * * L p [db(a)] L p [db(a)] Third-octave band sound pressure level Octave band sound pressure level Gesamt total total 53.1 * difference between working noise and background noise < 6 db, level correction by 1.3 db ** difference between working noise and background noise < 3 db, no level correction KÖTTER Consulting Engineers KG, Bonifatiusstraße 400, Rheine, Tel , Fax , koetter@koetter-consulting.com, Project , edited by J. Weinheimer, 8/2/20 Terz_2MW_ xls\IEC-Terzspektrum2-9

57 Noise emission measurement of E-82 E2 at wind-farm Fiebing, Ser. No , Mode 2 MW third-octave band sound pressure level for v s = m/s L p,terz [db(a)] L p,okt [db(a)] * * * 25.6* * * * * * * 46.3* * L p [db(a)] L p [db(a)] Third-octave band sound pressure level Octave band sound pressure level Gesamt total total 52.4 * difference between working noise and background noise < 6 db, level correction by 1.3 db ** difference between working noise and background noise < 3 db, no level correction KÖTTER Consulting Engineers KG, Bonifatiusstraße 400, Rheine, Tel , Fax , koetter@koetter-consulting.com, Project , edited by J. Weinheimer, 8/2/20 Terz_2MW_ xls\IEC-Terzspektrum2-

58 WTG E-82 E2 at wind-farm Fiebing, mode 2 MW Spectra, v s = 5 m/s Spectrum 5-1, 16:45:05 Spectrum 5-2, 16:45: Spectrum 5-3, 16:45:25 Spectrum 5-4, 16:45: Spectrum 5-5, 16:45:45 Spectrum 5-6, 16:45: Spectrum 5-7, 16:51:05 Spectrum 5-8, 16:51: Spectrum 5-9, 16:51:25 Spectrum 5-, 16:51: Spectrum 5-11, 16:51:45 Spectrum 5-12, 16:51: Background noise spectrum 5 m/s Project , edited by J. Weinheimer, 01/31/2011 IEC_Ton_ _2002_2MW_engl.xls\FFT-5

59 WTG E-82 E2 at wind-farm Fiebing, mode 2 MW Spectra, v s = 6 m/s Spectrum 6-1, 16:49:05 Spectrum 6-2, 16:49: Spectrum 6-3, 16:49:25 Spectrum 6-4, 16:49: Spectrum 6-5, 16:49:45 Spectrum 6-6, 16:49: Spectrum 6-7, 17:01:05 Spectrum 6-8, 17:01: Spectrum 6-9, 17:01:25 Spectrum 6-, 17:01: Spectrum 6-11, 17:01:45 Spectrum 6-12, 17:01: Background noise spectrum 6 m/s Project , edited by J. Weinheimer, 01/31/2011 IEC_Ton_ _2002_2MW_engl.xls\FFT-6

60 WTG E-82 E2 at wind-farm Fiebing, mode 2 MW Spectra, v s = 7 m/s Spectrum 7-1, 13:41:05 Spectrum 7-2, 13:41: Spectrum 7-3, 13:41:25 Spectrum 7-4, 13:41: Spectrum 7-5, 13:41:45 Spectrum 7-6, 13:41: Spectrum 7-7, 17:04:05 Spectrum 7-8, 17:04: Spectrum 7-9, 17:04:25 Spectrum 7-, 17:04: Spectrum 7-11, 17:04:45 Spectrum 7-12, 17:04: Background noise spectrum 7 m/s Project , edited by J. Weinheimer, 01/31/2011 IEC_Ton_ _2002_2MW_engl.xls\FFT-7

61 WTG E-82 E2 at wind-farm Fiebing, mode 2 MW Spectra, v s = 8 m/s Spectrum 8-1, 12:45:05 Spectrum 8-2, 12:45: Spectrum 8-3, 12:45:25 Spectrum 8-4, 12:45: Spectrum 8-5, 12:45:45 Spectrum 8-6, 12:45: Spectrum 8-7, 12:51:05 Spectrum 8-8, 12:51: Spectrum 8-9, 12:51:25 Spectrum 8-, 12:51: Spectrum 8-11, 12:51:45 Spectrum 8-12, 12:51: Background noise spectrum 8 m/s Project , edited by J. Weinheimer, 01/31/2011 IEC_Ton_ _2002_2MW_engl.xls\FFT-8

62 WTG E-82 E2 at wind-farm Fiebing, mode 2 MW Spectra, v s = 9 m/s Spectrum 9-1, 12:44:05 Spectrum 9-2, 12:44: Spectrum 9-3, 12:44:25 Spectrum 9-4, 12:44: Spectrum 9-5, 12:44:45 Spectrum 9-6, 12:44: Spectrum 9-7, 12:58:05 Spectrum 9-8, 12:58: Spectrum 9-9, 12:58:25 Spectrum 9-, 12:58: Spectrum 9-11, 12:58:45 Spectrum 9-12, 12:58: Background noise spectrum 9 m/s Project , edited by J. Weinheimer, 01/31/20 IEC_Ton_ _2002_2MW_engl.xls\FFT-9

63 WTG E-82 E2 at wind-farm Fiebing, mode 2 MW Spectra, v s = m/s Spectrum -1, 12:47:05 Spectrum -2, 12:47: Spectrum -3, 12:47:25 Spectrum -4, 12:47: Spectrum -5, 12:47:45 Spectrum -6, 12:47: Spectrum -7, 12:57:05 Spectrum -8, 12:57: Spectrum -9, 12:57:25 Spectrum -, 12:57: Spectrum -11, 12:57:45 Spectrum -12, 12:57: Background noise spectrum m/s Project , edited by J. Weinheimer, 01/31/2011 IEC_Ton_ _2002_2MW_engl.xls\FFT-

64 Tonal components analysis according to IEC v s = 5 m/s Location: wind-farm Fiebing Ser. No.: Project No.: WTG type: E-82 E2 Working mode: 2 MW Date: 8/06/20 No tonal components have been found. Spectrum Mean f T [Hz] Δf C [Hz] f 1 [Hz] f 2 [Hz] L pt [db] L pn,avg [db] L back [db] L pn,avg - L back [db] L pn,avg,corr [db] L pn [db] ΔL tn [db] U A (ΔL tn ) [db] - L a [db] - ΔL a,k [db] - v s = 6 m/s No tonal components have been found. Spectrum Mean f T [Hz] Δf C [Hz] f 1 [Hz] f 2 [Hz] L pt [db] L pn,avg [db] L back [db] L pn,avg - L back [db] L pn,avg,corr [db] L pn [db] ΔL tn [db] U A (ΔL tn ) [db] - L a [db] - ΔL a,k [db] - Project , edited by J. Weinheimer, 01/31/2011 / IEC_Ton_ _2002_2MW.xls\Ergebnisblatt

65 Tonal components analysis according to IEC v s = 7 m/s 1st tonal frequency Spectrum Mean f T [Hz] 116,0 116,0 116,0 120,0 120,0 120,0 116,0 116,0 116,0 116,0 120,0 120,0 117,7 Δf C [Hz] 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 1,0 f 1 [Hz] 65,5 65,5 65,5 69,5 69,5 69,5 65,5 65,5 65,5 65,5 69,5 69,5 67,2 f 2 [Hz] 166,5 166,5 166,5 1,5 1,5 1,5 166,5 166,5 166,5 166,5 1,5 1,5 168,2 L pt [db] 35,8 36,3 36,4-37,6 36, ,0-35,2 36,2 36,2 L pn,avg [db] 26,9 27,3 27,7 29,3 28,9 29, ,4 27,9 28,1 28,6 28,2 L back [db] 20,7 20,7 20,7-20,7 20, ,7-20,7 20,7 20,7 L pn,avg - L back [db] 6,2 6,6 7,0-8,3 8, ,7-7,4 7,9 7,6 L pn,avg,corr [db] 25,7 26,3 26,8-28,3 28, ,6-27,2 27,8 27,4 L pn [db] 38,0 38,5 39,0-40,5 41, ,9-39,4 40,1 39,7 ΔL tn [db] -2,2-2,2-2,6-12,3-3,0-4,5-12,3-12,3-4,8-12,3-4,3-3,8-4,8 U A (ΔL tn ) [db] 4,4 L a [db] -2,0 ΔL a,k [db] -2,8 v s = 8 m/s 1st tonal frequency Spectrum Mean f T [Hz] 124,0 124,0 124,0 124,0 124,0 124,0 128,0 124,0 124,0 124,0 124,0 124,0 124,3 Δf C [Hz] 1,1 1,1 1,1 1,1 1,1 1,1 1,2 1,1 1,1 1,1 1,1 1,1 1,1 f 1 [Hz] 73,4 73,4 73,4 73,4 73,4 73,4 77,4 73,4 73,4 73,4 73,4 73,4 73,8 f 2 [Hz] 174,6 174,6 174,6 174,6 174,6 174,6 178,6 174,6 174,6 174,6 174,6 174,6 174,9 L pt [db] ,8 38,9 39,3 39,0 38,9 37,6 38,6 L pn,avg [db] ,3 29,1 29,8 29,2,3 28,8 29,4 L back [db] ,7 21,7 21,7 21,7 21,7 21,7 21,7 L pn,avg - L back [db] ,6 7,4 8,1 7,5 8,6 7,1 7,7 L pn,avg,corr [db] ,5 28,2 29,1 28,3 29,7 27,8 28,7 L pn [db] ,8 40,4 41,4 40,6 42,0 40,1 40,9 ΔL tn [db] -12,3-12,3-12,3-12,3-12,3-12,3-2,9-1,5-2,1-1,6-3,0-2,4-4,8 U A (ΔL tn ) [db] 5,2 L a [db] -2,0 ΔL a,k [db] -2,8 Project , edited by J. Weinheimer, 01/31/2011 / IEC_Ton_ _2002_2MW.xls\Ergebnisblatt

66 Tonal components analysis according to IEC v s = 9 m/s 1st tonal frequency Spectrum Mean f T [Hz] 128,0 124,0 124,0 124,0 124,0 124,0 124,0 124,0 128,0 124,0 124,0 128,0 125,0 Δf C [Hz] 1,2 1,1 1,1 1,1 1,1 1,1 1,1 1,1 1,2 1,1 1,1 1,2 1,1 f 1 [Hz] 77,4 73,4 73,4 73,4 73,4 73,4 73,4 73,4 77,4 73,4 73,4 77,4 74,4 f 2 [Hz] 178,6 174,6 174,6 174,6 174,6 174,6 174,6 174,6 178,6 174,6 174,6 178,6 175,6 L pt [db] 36, ,7 36,1-40,1 40,8 40,5 40,3 41,3 42,3 39,9 L pn,avg [db],4-29,8 29,1,0-29,0 28,4 29,6 28,8 29,6,6 29,6 L back [db] 22, ,3 22,3-22,3 22,3 22,3 22,3 22,3 22,3 22,3 L pn,avg - L back [db] 8, ,8 7,7-6,7 6,1 7,3 6,6 7,3 8,3 7,3 L pn,avg,corr [db] 29, ,0 29,2-27,9 27,2 28,7 27,8 28,7 29,9 28,7 L pn [db] 41, ,3 41,5-40,2 39,4 41,0 40,0 40,9 42,2 40,9 ΔL tn [db] -5,5-12,3-12,3-3,6-5,3-12,3-0,1 1,3-0,4 0,3 0,4 0,1-2,0 U A (ΔL tn ) [db] 5,4 L a [db] -2,0 ΔL a,k [db] 0,03 v s = m/s 1st tonal frequency Spectrum Mean f T [Hz] 124,0 128,0 128,0 128,0 124,0 128,0 128,0 124,0 124,0 124,0 128,0 124,0 126,0 Δf C [Hz] 1,1 1,2 1,2 1,2 1,1 1,2 1,2 1,1 1,1 1,1 1,2 1,1 1,1 f 1 [Hz] 73,4 77,4 77,4 77,4 73,4 77,4 77,4 73,4 73,4 73,4 77,4 73,4 75,4 f 2 [Hz] 174,6 178,6 178,6 178,6 174,6 178,6 178,6 174,6 174,6 174,6 178,6 174,6 176,6 L pt [db] 39, ,5 38,3 37,7 41,1 39,0 38,8 39,1 41,1 37,4 39,2 L pn,avg [db] 32, ,7 29,0 29,4 29,1 28,4 29,7 27,7 29,9 31,1 29,8 L back [db] 22, ,3 22,3 22,3 22,3 22,3 22,3 22,3 22,3 22,3 22,3 L pn,avg - L back [db] 9, ,4 6,7 7,1 6,8 6,1 7,4 5,4 7,5 8,8 7,5 L pn,avg,corr [db] 31, ,9 27,9 28,5 28,1 27,2 28,8 26,2 29,0,5 28,9 L pn [db] 43, ,1 40,2 40,8 40,4 39,4 41,1 38,4 41,3 42,8 41,2 ΔL tn [db] -4,3-12,3-12,3-2,6-1,9-3,1 0,7-0,4-2,3 0,7-0,2-5,4-2,2 U A (ΔL tn ) [db] 4,5 L a [db] -2,0 ΔL a,k [db] -0,2 At one narrowband spectrum the difference between working noise and background noise is < 6 db. The masking noise is influenced by the background noise. The results are support values. Project , edited by J. Weinheimer, 01/31/2011 / IEC_Ton_ _2002_2MW.xls\Ergebnisblatt

67 Appendix D: Further measurement results

68 Sound power level L WA [db(a)] WTG type E-82 E2, Ser. No , mode 2 MW, sound power level Lw - system working noise Standardized wind speed vs [m/s] Project , edited by J. Weinheimer, 01/31/2011 / E-Ausw_n_ _2002_neu.xls\DatBer_LK1_Min IEC

69 WTG E-82 E2, Ser. No , working mode 2 MW: Rotor speed and electric power (one-minute mean values) Rotor speed n Rot [rpm] 18,0 17,5 y = -0, x 4 + 0, x 3-0, x 2 + 0,0291x + 3,41 17,0 16,5 16,0 15,5 15,0 14,5 14,0 13,5 13,0 12,5 12, Power P m [kw] Project , edited by J. Weinheimer, 01/31/2011 / E-Ausw_n_ _2002_neu_2MW_engl.xls\Scatterplot1_2MW

70 Evaluation of impulsive components Location: wind-farm Fiebing Project No.: WTG type: E-82 E2 Date: 8/2/20 Ser. No.: Working mode: 2 MW mean values per bin Time L AFeq L AFTeq P m v s v s L AFeq L AFTeq L AFTeq - L AFeq K IN [h:min:s] [db(a)] [db(a)] [kw] [m/s] [m/s] [db(a)] [db(a)] [db] [db] 12:57: :47: :54: :43: :40: :46: :56: :58: :44: :48: :42: :55: :49: :53: :41: :51: :45: :42: :04: :41: :55: :05: :59: :03: :40: :01: :49: :53: :54: :00: :42: :46: :48: :: :56: :02: :58: :44: :52: :51: :45: Project , edited by J. Weinheimer, 1/31/2011 E-Ausw_n_ _2002_neu_2MW_engl.xls\IEC-Impuls1

71 Appendix E: Characteristic power curve and manufacturer certification of E-82 E2

72 Leistungskennlinie E-82 E2 2 MW (in Abhängigkeit der Luftdichte) Standardluftdichte ρ = 1,225 kg/m³ Veränderte Luftdichte ρ = 1,225 kg/m³ Wind Leistungskennlinie P Leistungsbeiwert c p Leistungskennlinie P Leistungsbeiwert c p ρ = 1,225 kg/m³ ρ = 1,225 kg/m³ ρ = 1,225 kg/m³ ρ = 1,225 kg/m³ [m/s] [kw] [ - ] [kw] [ - ] 1 0,0 0,00 0,0 0,00 2 3,0 0,12 3,0 0, ,0 0,29 25,0 0, ,0 0,40 82,0 0, ,0 0,43 174,0 0, ,0 0,46 321,0 0, ,0 0,48 532,0 0, ,0 0,49 815,0 0, ,0 0, 1.180,0 0, 1.580,0 0, ,0 0, ,0 0,42 1.8,0 0, ,0 0, ,0 0, ,0 0,29 2.0,0 0, ,0 0,23 2.0,0 0, ,0 0,19 2.0,0 0, ,0 0,15 2.0,0 0, ,0 0,13 2.0,0 0, ,0 0,11 2.0,0 0, ,0 0,09 2.0,0 0, ,0 0,08 2.0,0 0, ,0 0,07 2.0,0 0, ,0 0,06 2.0,0 0, ,0 0,05 2.0,0 0, ,0 0,05 2.0,0 0, ,0 0,04 2.0,0 0,04 Kennlinien E-82 E2 2 MW mit Standardluftdichte Leistung P [kw] , 0,40 0, 0,20 0, 0, Windgeschwindigkeit v in Nabenhöhe [m/s] Leistungsbeiwert c p [ - ] Leistungskennlinie P ρ = 1,225 kg/m³ Leistungsbeiwert cp ρ = 1,225 kg/m³ Leistungskennlinie P ρ = 1,225 kg/m³ Leistungsbeiwert cp ρ = 1,225 kg/m³ Rev 3.0 Gedruckt am:

73 Applicated power curve, working mode 2 MW, based on "Leistungskennlinie E-82 E2 2 MW", Rev. 3_0, calculated v H [m/s] y = 0, x 5-0, x 4 + 0, x 3-0, x 2 + 0, x + 2, P [kw] Project , edited by J. Weinheimer, 01/31/2011 / E-Ausw_n_ _2002_neu_2MW_engl.xls\Leistungskurven

74

75 Appendix F: Extract from the test report

76 Summary of Test Report (Conversion of hub height of 8 m to 78 m) /1/ Basic sheet "Geräusche" (Noise), according to the "Technische Richtlinien für Windenergieanlagen, Teil 1: Bestimmung der Schallemissionswerte" (Technical Guidelines for Wind Energy Converters, Part 1: Determination of sound emission values) Rev. 18 of February 1, 2008 (Editor: Fördergesellschaft Windenergie e.v. Stresemannplatz 4, D-243 Kiel) Extract of Test Report IEC on noise emission of wind energy converter of type E-82 E2 General Data Technical Data (manufacturer s specifications) Manufacturer of WTG: Enercon GmbH Rated power (generator): kw (mode 2,000 kw) Serial number: Diameter of rotor: 82 m Location of WEC (ca.): Großefehn Hub height above ground: 78 m *** Geographic coordinates: GK longitude: Type of tower: conical tube tower GK latitude: Power control: Pitch Complementary rotor data (manufacturer s specifications) Complementary data of gear unit and generator (manufacturer s specifications) Manufacturer of rotor blade: Enercon Manufacturer of gear unit: not applicable Type of rotor blade: E-82 E2 Type of gear unit: not applicable Blade setting angle: variable Manufacturer of generator: Enercon Number of rotor blades: 3 Type of generator: E-82 E2 Rotor speed range: 6 to 18 r.p.m. (mode OM I) Generator speed range: 6 to 18 r.p.m. (mode OM I) sound power level L WA,P tonal audibility ΔL a,k impulse adjustment for small distances K IN Calculated Performance Chart ENERCON E-82 E2; 2,000 kw; calculated by ENERCON (Rev. 3.0) Reference Point standardised wind speed in m height active power Noise emission parameters Observations 5 ms -1 4 kw -- (1) 6 ms kw 99.5 db(a) 7 ms -1 1,451 kw 1.5 db(a) 8 ms -1 1,846 kw 2.4 db(a) 9 ms -1 2,000 kw 2.6 db(a) ms -1 2,000 kw 2.2 db(a) 5 ms -1 4 kw -- (1) 6 ms kw < db 7 ms -1 1,451 kw db 8 ms -1 1,846 kw db 9 ms -1 2,000 kw 0.0 db ms -1 2,000 kw db 5 ms -1 4 kw -- (1) 6 ms kw 0 db 7 ms -1 1,451 kw 0 db 8 ms -1 1,846 kw 0 db 9 ms -1 2,000 kw 0 db ms -1 2,000 kw 0 db Third-octave band sound power level for v s = 5 ms -1 in db(a) Frequency L WA,P Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 5 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 6 ms -1 in db(a) Frequency L WA,P 78.1** * 88.1* 90.9 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 6 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.2*

77 Third-octave band sound power level for v s = 7 ms -1 in db(a) Frequency L WA,P 79.5** * 85.2* * 90.2* 90.5* 93.0 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 7 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.6* Third-octave band sound power level for v s = 8 ms -1 in db(a) Frequency L WA,P * 93.6 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 8 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 9 ms -1 in db(a) Frequency L WA,P * 93.3 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 9 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = ms -1 in db(a) Frequency L WA,P * * 90.5* 90.7* 92.6* Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P * 96.1* This summary of the test report is valid only in combination with the certification of the manufacturer of 20/03/05. These specifications do not replace the test report mentioned above (particularly for noise immission predictions). Observations: (1) No values available due to meteorological conditions * Difference between working and background noise < 6 db, correction by 1.3 db ** Difference between working and background noise < 3 db, values shall not be presented *** Conversion of hub height of 8 m to 78 m /1/ Wind turbine generator systems Part 11: Acoustic noise; measurement techniques (IEC :2002 and A1:2006); German version DIN EN :2007 Measured by: Date: 20/08/06 KÖTTER Consulting Engineers - Rheine - i. V. Dipl.-Ing. O. Bunk i. A. Dipl.-Ing. J. Weinheimer

78 Summary of Test Report (Conversion of hub height of 8 m to 85 m) /1/ Basic sheet "Geräusche" (Noise), according to the "Technische Richtlinien für Windenergieanlagen, Teil 1: Bestimmung der Schallemissionswerte" (Technical Guidelines for Wind Energy Converters, Part 1: Determination of sound emission values) Rev. 18 of February 1, 2008 (Editor: Fördergesellschaft Windenergie e.v. Stresemannplatz 4, D-243 Kiel) Extract of Test Report IEC on noise emission of wind energy converter of type E-82 E2 General Data Technical Data (manufacturer s specifications) Manufacturer of WTG: Enercon GmbH Rated power (generator): kw (mode 2,000 kw) Serial number: Diameter of rotor: 82 m Location of WEC (ca.): Großefehn Hub height above ground: 85 m *** Geographic coordinates: GK longitude: Type of tower: conical tube tower GK latitude: Power control: Pitch Complementary rotor data (manufacturer s specifications) Complementary data of gear unit and generator (manufacturer s specifications) Manufacturer of rotor blade: Enercon Manufacturer of gear unit: not applicable Type of rotor blade: E-82 E2 Type of gear unit: not applicable Blade setting angle: variable Manufacturer of generator: Enercon Number of rotor blades: 3 Type of generator: E-82 E2 Rotor speed range: 6 to 18 r.p.m. (mode OM I) Generator speed range: 6 to 18 r.p.m. (mode OM I) sound power level L WA,P tonal audibility ΔL a,k impulse adjustment for small distances K IN Calculated Performance Chart ENERCON E-82 E2; 2,000 kw; calculated by ENERCON (Rev. 3.0) Reference Point standardised wind speed in m height active power Noise emission parameters Observations 5 ms kw -- (1) 6 ms kw 99.7 db(a) 7 ms -1 1,489 kw 1.6 db(a) 8 ms -1 1,867 kw 2.4 db(a) 9 ms -1 2,000 kw 2.5 db(a) ms -1 2,000 kw 2.1 db(a) 5 ms kw -- (1) 6 ms kw < db 7 ms -1 1,489 kw db 8 ms -1 1,867 kw db 9 ms -1 2,000 kw 0.0 db ms -1 2,000 kw db 5 ms kw -- (1) 6 ms kw 0 db 7 ms -1 1,489 kw 0 db 8 ms -1 1,867 kw 0 db 9 ms -1 2,000 kw 0 db ms -1 2,000 kw 0 db Third-octave band sound power level for v s = 5 ms -1 in db(a) Frequency L WA,P Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 5 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 6 ms -1 in db(a) Frequency L WA,P 78.3** * 88.3* 91.1 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P

79 Octave band sound power level for v s = 6 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.4* Third-octave band sound power level for v s = 7 ms -1 in db(a) Frequency L WA,P 79.6** * 85.3* * 90.3* 90.6* 93.1 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 7 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.7* Third-octave band sound power level for v s = 8 ms -1 in db(a) Frequency L WA,P * 93.6 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 8 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 9 ms -1 in db(a) Frequency L WA,P * 93.2 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 9 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = ms -1 in db(a) Frequency L WA,P * * 90.4* 90.6* 92.5* Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P * 96.0* This summary of the test report is valid only in combination with the certification of the manufacturer of 20/03/05. These specifications do not replace the test report mentioned above (particularly for noise immission predictions). Observations: (1) No values available due to meteorological conditions * Difference between working and background noise < 6 db, correction by 1.3 db ** Difference between working and background noise < 3 db, values shall not be presented *** Conversion of hub height of 8 m to 85 m /1/ Wind turbine generator systems Part 11: Acoustic noise; measurement techniques (IEC :2002 and A1:2006); German version DIN EN :2007 Measured by: Date: 20/08/06 KÖTTER Consulting Engineers - Rheine - i. V. Dipl.-Ing. O. Bunk i. A. Dipl.-Ing. J. Weinheimer

80 Summary of Test Report (Conversion of hub height of 8 m to 98 m) /1/ Basic sheet "Geräusche" (Noise), according to the "Technische Richtlinien für Windenergieanlagen, Teil 1: Bestimmung der Schallemissionswerte" (Technical Guidelines for Wind Energy Converters, Part 1: Determination of sound emission values) Rev. 18 of February 1, 2008 (Editor: Fördergesellschaft Windenergie e.v. Stresemannplatz 4, D-243 Kiel) Extract of Test Report IEC on noise emission of wind energy converter of type E-82 E2 General Data Technical Data (manufacturer s specifications) Manufacturer of WEG: Enercon GmbH Rated power (generator): kw (mode 2,000 kw) Serial number: Diameter of rotor: 82 m Location of WEC (ca.): Großefehn Hub height above ground: 98 m *** Geographic coordinates: GK longitude: Type of tower: conical tube tower GK latitude: Power control: Pitch Complementary rotor data (manufacturer s specifications) Complementary data of gear unit and generator (manufacturer s specifications) Manufacturer of rotor blade: Enercon Manufacturer of gear unit: not applicable Type of rotor blade: E-82 E2 Type of gear unit: not applicable Blade setting angle: variable Manufacturer of generator: Enercon Number of rotor blades: 3 Type of generator: E-82 E2 Rotor speed range: 6 to 18 r.p.m. (mode OM I) Generator speed range: 6 to 18 r.p.m. (mode OM I) sound power level L WA,P tonal audibility ΔL a,k impulse adjustment for small distances K IN Calculated Performance Chart ENERCON E-82 E2; 2,000 kw; calculated by ENERCON (Rev. 3.0) Reference Point standardised wind speed in m height active power Noise emission parameters Observations 5 ms kw -- (1) 6 ms -1 1,038 kw 0.0 db(a) 7 ms -1 1,561 kw 1.8 db(a) 8 ms -1 1,904 kw 2.5 db(a) 9 ms -1 2,000 kw 2.5 db(a) ms -1 2,000 kw 2.0 db(a) 5 ms kw -- (1) 6 ms -1 1,038 kw < db 7 ms -1 1,561 kw db 8 ms -1 1,904 kw db 9 ms -1 2,000 kw 0.0 db ms -1 2,000 kw db 5 ms kw -- (1) 6 ms -1 1,038 kw 0 db 7 ms -1 1,561 kw 0 db 8 ms -1 1,904 kw 0 db 9 ms -1 2,000 kw 0 db ms -1 2,000 kw 0 db Third-octave band sound power level for v s = 5 ms -1 in db(a) Frequency L WA,P Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 5 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 6 ms -1 in db(a) Frequency L WA,P 78.6** * 88.6* 91.4 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P

81 Octave band sound power level for v s = 6 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.7* Third-octave band sound power level for v s = 7 ms -1 in db(a) Frequency L WA,P 79.8** * 85.5* * 90.5* 90.8* 93.3 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 7 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.9* Third-octave band sound power level for v s = 8 ms -1 in db(a) Frequency L WA,P * 93.7 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 8 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 9 ms -1 in db(a) Frequency L WA,P * 93.2 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 9 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = ms -1 in db(a) Frequency L WA,P * * 90.3* 90.5* 92.4* Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P * 95.9* This summary of the test report is valid only in combination with the certification of the manufacturer of 20/03/05. These specifications do not replace the test report mentioned above (particularly for noise immission predictions). Observations: (1) No values available due to meteorological conditions * Difference between working and background noise < 6 db, correction by 1.3 db ** Difference between working and background noise < 3 db, values shall not be presented *** Conversion of hub height of 8 m to 98 m /1/ Wind turbine generator systems Part 11: Acoustic noise; measurement techniques (IEC :2002 and A1:2006); German version DIN EN :2007 Measured by: Date: 20/08/06 KÖTTER Consulting Engineers - Rheine - i. V. Dipl.-Ing. O. Bunk i. A. Dipl.-Ing. J. Weinheimer

82 Summary of Test Report (Measured hub height of 8 m) /1/ Basic sheet "Geräusche" (Noise), according to the "Technische Richtlinien für Windenergieanlagen, Teil 1: Bestimmung der Schallemissionswerte" (Technical Guidelines for Wind Energy Converters, Part 1: Determination of sound emission values) Rev. 18 of February 1, 2008 (Editor: Fördergesellschaft Windenergie e.v. Stresemannplatz 4, D-243 Kiel) Extract of Test Report IEC on noise emission of wind energy converter of type E-82 E2 General Data Technical Data (manufacturer s specifications) Manufacturer of WTG: Enercon GmbH Rated power (generator): kw (mode 2,000 kw) Serial number: Diameter of rotor: 82 m Location of WEC (ca.): Großefehn Hub height above ground: 8 m Geographic coordinates: GK longitude: Type of tower: conical tube tower GK latitude: Power control: Pitch Complementary rotor data (manufacturer s specifications) Complementary data of gear unit and generator (manufacturer s specifications) Manufacturer of rotor blade: Enercon Manufacturer of gear unit: not applicable Type of rotor blade: E-82 E2 Type of gear unit: not applicable Blade setting angle: variable Manufacturer of generator: Enercon Number of rotor blades: 3 Type of generator: E-82 E2 Rotor speed range: 6 to 18 r.p.m. (mode OM I) Generator speed range: 6 to 18 r.p.m. (mode OM I) sound power level L WA,P tonal audibility ΔL a,k impulse adjustment for small distances K IN Calculated Performance Chart ENERCON E-82 E2; 2,000 kw; calculated by ENERCON (Rev. 3.0) Reference Point standardised wind speed in m height active power Noise emission parameters Observations 5 ms kw 96.8 db(a) (1) 6 ms -1 1,077 kw 0.2 db(a) 7 ms -1 1,605 kw 1.9 db(a) 8 ms -1 1,925 kw 2.5 db(a) 9 ms -1 2,000 kw 2.5 db(a) ms -1 2,000 kw 1.8 db(a) (*) 5 ms kw < db (1) 6 ms -1 1,077 kw < db 7 ms -1 1,605 kw db 8 ms -1 1,925 kw db 9 ms -1 2,000 kw 0.0 db ms -1 2,000 kw db 5 ms kw 0 db (1) 6 ms -1 1,077 kw 0 db 7 ms -1 1,605 kw 0 db 8 ms -1 1,925 kw 0 db 9 ms -1 2,000 kw 0 db ms -1 2,000 kw 0 db Third-octave band sound power level for v s = 5 ms -1 in db(a) Frequency L WA,P * Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P * 60.0* Octave band sound power level for v s = 5 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 6 ms -1 in db(a) Frequency L WA,P 78.8** * 88.8* 91.6 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P

83 Octave band sound power level for v s = 6 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 85.9* Third-octave band sound power level for v s = 7 ms -1 in db(a) Frequency L WA,P 79.9** * 85.6* * 90.6* 90.9* 93.4 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 7 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 86.0* Third-octave band sound power level for v s = 8 ms -1 in db(a) Frequency L WA,P * 93.7 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 8 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 9 ms -1 in db(a) Frequency L WA,P * 93.2 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 9 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = ms -1 in db(a) Frequency L WA,P * * 90.1* 90.3* 92.2* Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P * 95.7* This summary of the test report is valid only in combination with the certification of the manufacturer of 20/03/05. These specifications do not replace the test report mentioned above (particularly for noise immission predictions). Observations: (1) Lowest wind speed measured v s = 5,02 m/s * Difference between working and background noise < 6 db, correction by 1.3 db ** Difference between working and background noise < 3 db, values shall not be presented /1/ Wind turbine generator systems Part 11: Acoustic noise; measurement techniques (IEC :2002 and A1:2006); German version DIN EN :2007 Measured by: Date: 20/08/06 KÖTTER Consulting Engineers - Rheine - i. V. Dipl.-Ing. O. Bunk i. A. Dipl.-Ing. J. Weinheimer

84 Summary of Test Report (Conversion of hub height of 8 m to 138 m) /1/ Basic sheet "Geräusche" (Noise), according to the "Technische Richtlinien für Windenergieanlagen, Teil 1: Bestimmung der Schallemissionswerte" (Technical Guidelines for Wind Energy Converters, Part 1: Determination of sound emission values) Rev. 18 of February 1, 2008 (Editor: Fördergesellschaft Windenergie e.v. Stresemannplatz 4, D-243 Kiel) Extract of Test Report IEC on noise emission of wind energy converter of type E-82 E2 General Data Technical Data (manufacturer s specifications) Manufacturer of WTG: Enercon GmbH Rated power (generator): kw (mode 2,000 kw) Serial number: Diameter of rotor: 82 m Location of WEC (ca.): Großefehn Hub height above ground: 138 m *** Geographic coordinates: GK longitude: Type of tower: conical tube tower GK latitude: Power control: Pitch Complementary rotor data (manufacturer s specifications) Complementary data of gear unit and generator (manufacturer s specifications) Manufacturer of rotor blade: Enercon Manufacturer of gear unit: not applicable Type of rotor blade: E-82 E2 Type of gear unit: not applicable Blade setting angle: variable Manufacturer of generator: Enercon Number of rotor blades: 3 Type of generator: E-82 E2 Rotor speed range: 6 to 18 r.p.m. (mode OM I) Generator speed range: 6 to 18 r.p.m. (mode OM I) sound power level L WA,P tonal audibility ΔL a,k impulse adjustment for small distances K IN Calculated Performance Chart ENERCON E-82 E2; 2,000 kw; calculated by ENERCON (Rev. 3.0) Reference Point standardised wind speed in m height active power Noise emission parameters Observations 5 ms kw 97.4 db(a) 6 ms -1 1,175 kw 0.6 db(a) 7 ms -1 1,3 kw 2.1 db(a) 8 ms -1 1,971 kw 2.6 db(a) 9 ms -1 2,000 kw 2.4 db(a) ms -1 2,000 kw -- (1) 5 ms kw < db 6 ms -1 1,175 kw < db 7 ms -1 1,3 kw db 8 ms -1 1,971 kw db 9 ms -1 2,000 kw 0.0 db ms -1 2,000 kw -- (1) 5 ms kw 0 db 6 ms -1 1,175 kw 0 db 7 ms -1 1,3 kw 0 db 8 ms -1 1,971 kw 0 db 9 ms -1 2,000 kw 0 db ms -1 2,000 kw -- (1) Third-octave band sound power level for v s = 5 ms -1 in db(a) Frequency L WA,P * Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P * 60.6* Octave band sound power level for v s = 5 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 6 ms -1 in db(a) Frequency L WA,P 79.2** * 89.2* 92.0 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P

85 Octave band sound power level for v s = 6 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 86.3* Third-octave band sound power level for v s = 7 ms -1 in db(a) Frequency L WA,P 80.1** * 85.8* * 90.8* 91.1* 93.6 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 7 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P 86.2* Third-octave band sound power level for v s = 8 ms -1 in db(a) Frequency L WA,P * 93.8 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 8 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = 9 ms -1 in db(a) Frequency L WA,P * 93.1 Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = 9 ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P Third-octave band sound power level for v s = ms -1 in db(a) Frequency L WA,P Frequency 800 1,000 1,2 1,600 2,000 2,0 3,1 4,000 5,000 6,0 8,000,000 L WA,P Octave band sound power level for v s = ms -1 in db(a) Frequency ,000 2,000 4,000 8,000 L WA,P This summary of the test report is valid only in combination with the certification of the manufacturer of 20/03/05. These specifications do not replace the test report mentioned above (particularly for noise immission predictions). Observations: (1) No values available due to weather conditions * Difference between working and background noise < 6 db, correction by 1.3 db ** Difference between working and background noise < 3 db, values shall not be presented *** Conversion of hub height of 8 m to 138 m /1/ Wind turbine generator systems Part 11: Acoustic noise; measurement techniques (IEC :2002 and A1:2006); German version DIN EN :2007 Measured by: Date: 20/08/06 KÖTTER Consulting Engineers - Rheine - i. V. Dipl.-Ing. O. Bunk i. A. Dipl.-Ing. J. Weinheimer