Verification & Certification Report (August 2009) For Power Generation

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1 Verification & Certification Report (August 2009) For Power Generation With Reference To Power Generation Guarantee (Agreement between Gujarat Alkalies & Chemicals Ltd. and Suzlon Energy Ltd.) for 23.75MW Wind Farm Project site: Moti Sindhodi, Dist. Kuchchh, Gujarat, India. Prepared for (Client) : Gujarat Alkalies & Chemicals Ltd., Vadodara, Gujarat, India Prepared by: Ravi Energie 202, Manubhai Towers-B, Baroda , India Document Control No- AAAA1301

2 INDEX 01 Introduction Scope of Work Limitation and Understanding between GACL & SEL Verification and Validation of Data Analysis Calculation Certification Other Observations Appendix Appendix Appendix Appendix Appendix Appenxix-6 31 Copy of Methodology as agreed upon between GACL & SEL (Schedule-3 of their agreement) Appendix-7 36 Copy of the work order issued by GACL

3 INTRODUCTION M/s Gujarat Alkalies and Chemicals Limited (GACL), having registered office at P.O. Petrochemicals , Dist Vadodara, Gujarat.; had installed MW wind farm at site Village Moti Sindhodi, Dist. Kuchchh, in Gujarat with19 nos. of 1250 kw capacity each SUZLON make wind turbine generators (WTGs). M/s SUZLON Energy Limited (SEL) is one of the leading manufacturers of WTG & also a Developer of Wind Farms. The said wind farm of GACL was commissioned at the site Moti Sindhodi, Dist. Kuchchh, Gujarat on 13/02/2008. SUZLON having extended Generation Guarantee for one year from the date of commissioning, i.e. from 15/04/2008 to 14/04/2009, GACL vide their order no. GACL/CPP/23.75MW/08/12959 dated 17/12/2008 (Annexure 1), have engaged M/s Ravi Energie, Vadodara for their consultancy services for verification & certification for power generation guarantee for MW windmill project at site Moti Sindhodi, Dist. Kuchchh, in Gujarat. PERIOD FOR VERIFICATIONS & CERTIFICATIONS: The duration of verifications shall be for the period of generation Guarantee starting from Hrs on 15 th April, 2008 to Hrs. on 14 th April, METHODOLOGY TO BE ADOPTED AND ADOPTED: As per the agreement between GACL and SEL, the methodology has been defined by both the parties and the same has been adopted by Ravi Energie. LIMITATIONS / COMMENTS ON METHODOLOGY 1. Limitations in theoretical predictions 2. Limitations of Measurements and data of air density and power law index 3. Limitations due to Power Curve for the 1250KW Machines 4. Limitations due to errors in measurements and capture of data related to other parameters affecting machine performance. The parameters as per 2, 3 & 4 above as adopted for calculations are provided and agreed upon by stake holders and are validated by Ravi Energie. 1

4 SCOPE OF WORK The scope of Verification and Certification by M/s Ravi Energie is as under: RELATED TO WIND: VERIFICATION OF WIND POTENTIAL: To verify and certify the data collected from the new wind mast, related to wind speed, wind direction, time and work out wind distribution and wind rose data. Note: Collection of wind data at a nearby place for past two years of data for the period from January 2004 to December 2005 to be and is used as the reference data for asserting the wind variation. Another data at the same location where the wind mast is reinstalled has been measured, by a data logger for the concerned period of guarantee. The crux of guarantee was based on old referred data on the ground that SEL is providing not only good machines but the good potential windy site. The shortfall in generation due to variation in wind within certain limits is also a part of guarantee. To verify and certify the calculation of percentage wind variation for the guaranteed period as per the agreed methodology RELATED TO MACHINE/ SUBSTATION/ GRID ETC : VERIFICATION OF GRID AVAILABILITY: To verify and certify the data from the data logger about the availability of grid supply. Note: No grid availability is considered as follows: 1. No supply conditions 2. Voltages, frequency and Currents beyond the specified acceptable limits VERIFICATION OF MACHINE AVAILABILITY: To verify the data for machine availability from the data logger at the machine control panel. Note: As per the methodology agreed upon, machine availability is to be considered collectively with grid availability RELATED TO VERIFICATION OF GUARANTEED POWER GENERATION: Working out the ideal power that should have been generated as per the conditions laid down in the agreed methodology as per appendix-6 attached to this document RELATED TO ACTUAL POWER GENERATION: Collection and verification of data for actual power generated as defined in agreed methodology. 2

5 RELATED TO DIFFERENCE IN ACTUAL GENERATION: GUARANTEED GENERATION & Calculation in the difference in the Annual Estimated Production (AEP) and Annual Actual Production (AAP) PROFESSIONALS DEPLOYED Measurements, Verification of calibrations, Data Collection etc.: Inspectors/ Professionals of Ravi Energie, 202, Manubhai Towers, Baroda , Gujarat, INDIA Verifications, Calculations, Reporting, Certification etc.: Ravindra M. Patel BE(Mech) ME(Prod Engg), PGD(Ref & Air Cond.) LL.B(Gen), LLB(Sp.) Chartered Engr(I), FIV(I), Certified Energy Auditor (India), PE(USA), Certified Energy Manager, (CEM)-(USA), Certified Sustainable Development Professional (CSDP)-(USA), Business Energy Professional- (BEP)-(USA) Professional Assistance by: Raju K Patel BE( Mech), ME(Thermal Science Group), FICWA, Chartered Engg(I), FIV(I), MIE(I), Certified Energy Auditor(India). MICA 3

6 LIMITATIONS AND UNDERSTANDING BETWEEN GACL & SEL: As informed to us SEL had collected wind data at the nearby location and the data collected for two years in past (Jan 2004 to December using wind mast with 65M height) was taken as a reference initially before finalization of the contract between GACL & SEL considering 1500KW Machines. At the time of finalization of contract, 1250KW machines were agreed upon to be installed and based on the prognosis an Annual Estimated Production (AEP) of Electrical power in terms of KWH was agreed upon and guaranteed by SEL. Considering the facts that, the wind velocity increases as the height increases for the same location (within limits) and there is a change in air density; the 1250 KW machines can generate power according to the height of the machine, corrections have been applied accordingly in wind energy contents. The reports has limitations due to limitations in theoretical predictions, complex behavior of wind, complex effect of wind shadow and Ravi Energie is not liable to that extent for any errors and omissions. The basic data of all the relevant parameters collected and verified and validated by Ravi Energie, has been agreed upon by both the stake holders namely GACL & SEL. The report, analysis, conclusion, certification and opinions drawn in following paragraph are strictly keeping in view the scope of work and limitations mentioned as above. 4

7 VALIDATION OF DATA SUBMITTED BY SEL GACL having entered into contract with SEL, the contract provides Schedule -3 about methodology for establishing shortfall, if any, in guaranteed generation performance for GACL project, Moti Sindhodi, Dist. Kuchchh, Gujarat. This methodology becomes the basis for verification, validation, analysis and conclusions. The said schedule is presented at appendix-6 to this report. VERIFICATION AND VALIDATION OF WIND DATA SUBMITTED BY SEL GACL forwarded monthly wind mast data for the entire period of one year i.e. 15 th April 2008 to 14 th April 2009 (Appendix-4-1,4-2,4-3, & 4-4). These data provide the details of: Monthly power law index Monthly air density Sector wise percentage of frequency distribution Monthly Wind Speed graph, Wind Speed Frequency Distribution and Wind Rose VERIFICATION AND VALIDATION OF WIND FARM PERFORMANCE DATA SUBMITTED BY SEL Regarding performance GACL provided actual power generation data of the MW wind farm with % plant load factors, wind turbine operating hours, grid availability hours and machine availability hours, etc. in excel sheet on daily basis and machine wise. We produce the abstract of the same at Appendix- 5-1 to

8 ANALYSIS With the above mentioned base data/ information/ clarifications, we verified & validated data for further analysis We preceded the analysis as under: Took reference annual estimated production (AEP) as submitted by SEL for 1500 kw WTG based on reference wind mast data for the period January 2004 to December 2005 (Appendix 1) Derived reference AEP for the 1250 kw WTG based on reference wind mast data for the period January 2004 to December 2005 on the same prognosis as SEL did above for 1500 kw WTG. With the assumption of 92% array efficiency, 95% of machine availability & 100% of grid availability the expected net generation per 1250 kw WTG is estimated to be 31,00,893 kwh (Appendix 2). Analyzed actual performance of 19 X 1250 kw SUZLON WTG for the period of 15 th April 2008 to 14 th April 2009 as per the formulae agreed between GACL & SEL, the actual machine availability worked out to be 97.42% and grid availability to be % (Appendix 3) Since the actual wind measurements provided by SEL for the period of July 2008 covered 7 th to 21 st July only, to consider full month we have adjusted there data proportionately. The adjusted monthly wind speed frequency distribution for the period 15 th April 2008 to 14 th April 2009 is presented at Appendix 4-1, 4-2, 4-3, 4-4 Based on the same prognosis at (1) & (2) above, we worked out estimated generation of 1250 kw WTG month wise for the guarantee period, i.e. 15 th April 2008 to 14 th April Summing up the monthly estimated generation it worked out AEP for guarantee period to be 24,76,687 kwh per WTG per annum with assumption of 92% array efficiency, 95% machine availability and 100% of grid availability. The annual summary and monthly workings are presented at Appendix 5-1, 5-2, 5-3, 5-4, 5-5, 5-6, 5-7, 5-8, 5-9, 5-10, 5-11, 5-12, 5-13, & 5-14 Abbreviations used in calculations: AEP: Annual Estimated Production in terms of KWH MEP: Monthly Estimated Production in terms of KWH 6

9 CALCULATIONS FOR DIFFERENCE IN GENERATION Based on the methodology and formulae agreed upon between GACL & SEL, the DIFFERENCE in generation BY MW wind farm is worked out for the guarantee period to be 37,36,728 kwh as under: P1 = Power Generation from Prognosis calculated as per kwh Reference Met Mast (in kwh) for 19 x 1250 kw WTGs. Each WTG is expected to generate 31,00,893 kwh per annum. (Refer Appendix - 2) P2 = Power Generation from Prognosis calculated as per New kwh Met Mast (in kwh) for 19 x 1250 kw WTGs. Each WTG is expected to generate 24,76,687 kwh per annum. (Refer Appendix - 5) P3 = % Variation in Generation (wind) i.e. (P1 - P2) x 100 / P % G = Guaranteed Generation per Annum i.e. 5,32,00,000 kwh kwh for 19 WTGs P4 = (100-10)% = 90% % (Generation Variation Factor due to wind variation, if (-ve) up to 10% in case the %age variation is more than 10% it is to be considered as 10% i.e. if P3 >=10%, then P4 = 90%) Y = Grid Correction Factor (as calculated) % (SEL has assured 98% Grid Availability) So for Working out shortfall in generation % Z = g = P = Actual Generation of wind farm for first year, i.e kwh guarantee period It is derived that Actual generation is less than guaranteed generation Calculation for shortfall in Generation Guaranteed Generation considering wind variation (-ve) kwh and grid at 98% and other factors i.e. 5,32,00,000 x P4 x Y Excess or Shortfall in Generation for first year (kwh) kwh i.e. (5,32,00,000 x P4 x Y) Z i.e. g Z 7

10 CERTIFICATION OF SHORT FALL IN GENERATION We certify that the shortfall in generation of MW wind farm of GACL at Moti Sindhodi to be 37,36,728 kwh during guarantee period form 15 th April 2008 to 14 th April We certify that, the study has been conducted in a open way and in a unbiased manner towards both the parties involved ie; M/s Gujarat Alkalies and Chemicals Limited (GACL) and M/s SUZLON Energy Limited (SEL) and only the formula that was agreed by both the parties was being used in the study. The collection of primary and secondary data collected along with other information, with best possible accuracies, and has been used to reach the conclusion. We further certify that we have conducted the study with Full Social Accountability as a part of our service ethics. Ravindra M Patel Group President, RAVI ENERGIE Ravindra M Patel Certified Sustainable Development Professional (CSDP, USA; CSDP No: 105) Certified Business Energy Professional (BEP, USA; BEP No: 564) Certified Energy Manager (CEM, USA; CEM No: 11177) Certified Energy Auditor(CEA, India; CEA N0: EA-3740/Cert No: 1130) PE(USA), Charted Engineer (India) BE(Mech), ME(Prod Engg), PGD (Ref & AirCond) LL.B(Gen), LL.B(Spl), FIE(I), FIV(I) Life/ Fellow Member: AEE(USA), ASHRAE(USA), ASME, SES(I), ISNT, ICC 8

11 OTHER OBSERVATIONS For improvement of performance of wind farm in future, we draw the attention of GACL to their agreed term with SEL reads SEL has confirmed that if degradation in guaranteed generation is not due to wind, then remedial measures will be taken in order to ensure the rated power out. SEL expected the wind farm to generate 5,89,16,968 kwh per annum with reference wind data. As per agreed methodology the variation in generation during guaranteed period generation works out to be 20.13%. So keeping all other parameters of grid availability (100%), machine availability (95%) and array efficiency (92%) this wind farm should have generated at least, [5,89,16,968 X ( )], i.e. 470,56,982 kwh. Against this the actual generation achieved is 4,31,85,672 lacs, i.e. 8.22% of shortfall in generation which can be attributable to the machine design, performance, maintenance, etc. and calls for improvement and remedial measures by SEL since GACL is required to run these WTGs beyond guarantee period. 9

12 RAVI ENERGIE APPENDIX - 1 REFERENCE "AEP" FOR 1500 kw WTG (as provided by SEL) Data : ANNUAL Power Law Index: 0.2 WTG Type: SUZLON S-82, 1500 kw Pitch Type Air Density at site: (kg/m3) Hub Height 78.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 78.5 m height at std. air density at site air density Generated m/s km/h % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) Reference AEP for 1500 kw WTG provided by SEL (2) Base Data of reference mast for the period January 2004 to December 2005

13 RAVI ENERGIE APPENDIX - 2 REFERENCE "AEP" PREPARED FOR 1250 kw WTG (on line of that of 1500 kw WTG provided by SEL Data : ANNUAL Power Law Index: 0.2 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s km/h % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) Reference AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) Base Data of reference mast for the period January 2004 to December 2005

14 RAVI ENERGIE APPENDIX - 3 Analysis of Actual Performance of 19 x 1250 kw SUZLON S-66 WTGs (form 15 April 2008 to 14 April 2009) Location : Moti Sindholi Generation %PLF Operating Grid OK M/c avai Grid avail M/c Avai Load Shed S FM+S+U Recorded % Grid Month (kwh) Hrs Hrs Hrs % % (U) Hours Hours Hours Availability APRIL 2008 (15-30 April) MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER JANUARY FEBRUARY MARCH APRIL 2009 ( 1-14 April) TOTAL Note: (a) Operating Hours means the WTG recorded the hours of operations on controller (b) Grid OK Hours means the WTG recorded the hours of acceptable grid on controller (c ) Grid Availability (%) means the grid was available at DP/ Transformer/ Controller end, irrespective of (a) and/or (b) (d) Load Shed Hours means Unscheduled Maintenance Hours (U) (e) Scheduled Mainteance Hours (S) means the operators took up the rouitine maintenance of WTG (f) FM (Hours) means Force Majeure conditions (g) Grid Recorded Hours = Total Hours of the period - (FM+S+U) as per contract terms (h) % Grid Availability = Grid Recorded hours X 100 / (Total Hours of the period - FM) as per contract terms

15 Appendix 4-1 Wind Speed Frequency Distribution Adjusted From 15th April 2008 to 14th April 2009 Appendix Wind Frequency for the Month of Speed April May June July August September October November December January February March April ANNUAL (15-30 April) (Note 1) (Note 2) (from 1-14) (m/s) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) (Hours) Total Note: (1) The data of April 2008 to be considered for April 2008, submitted by SEL lateron (2) In the month of July 2008, the wind speed data available for 7 to 21 July To consider full month, data are proportionally revised Page-13

16 Sector Wise Percentage Frequency Distribution For the period 15-Apr-08 to 14-Apr-09 Project: Location: Sensor height: Averaging time: Site Information Wind Monitoring in Gujarat Moti Sindhodi (GACL) 60m 10 minutes Wind Speed N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW (m/s) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%) (%)

17 Monthly Power Law Index Graph For the period 15-Apr-08 to 14-Apr-09 Project: Location: Averaging time: Site Information Wind Monitoring in Gujarat Moti Sindhodi (GACL) 10 minutes Month Power Law Index Apr-08 * 0.14 Monthly Power Law Index May Jun Jul Aug Sep Oct Nov Dec PLI Jan Feb Mar Apr-09 ** 0.23 Annual Apr-08 * May-08 Jun-08 Jul-08 Aug-08 Sep-08 Oct-08 Nov-08 Dec-08 Jan-09 Feb-09 Mar-09 Apr-09 ** Annual Month Note:- 1) * : Data Period: 15-Apr-08 to 30-Apr-08. ** : Data Period: 01-Apr-09 to 14-Apr-09. 2) Power law Indeax is based on measurments betwwen 60m and 65m heights.

18 Monthly Air Density Graph For the period 15-Apr-08 to 14-Apr-09 Project: Location: Averaging time: Site Information Wind Monitoring in Gujarat Moti Sindhodi (GACL) Hourly Month Air Density (kg/m 3 ) Apr-08 * May Jun Monthly Air Density Jul Aug Sep Oct Nov Dec Jan Air Deisity (kg/m 3 ) Feb Mar Apr-09 ** Annual Apr-08 * May-08 Jun-08 Jul-08 Aug-08 Sep-08 Oct-08 Nov-08 Dec-08 Jan-09 Feb-09 Mar-09 Apr-09 ** Annual Month Note:- 1) * : Data Period: 15-Apr-08 to 30-Apr-08. ** : Data Period: 01-Apr-09 to 14-Apr-09.

19 RAVI ENERGIE Appendix "AEP" PREPARED FOR 1250 kw WTG for Year from 15 April '08 to 14 April '09 (based on actual data of wind mast at site) Data : 15 April '08 to 14 April '09 WTG Type: SUZLON S-66, 1250 kw Pitch Type Hub Height 74.5 m Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Total Units Interval Speed Percent Hours Generated m/s m/s % Hours kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency Correction Factor for M/C Availability Correction Factor for Grid Availibility 92% 95% 100% Note: AEP generated for each month and totalled to get annual generation

20 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of APRIL 2008 (15 to 30 April) (based on actual data of wind mast at site) Data : APRIL 2008 (15 to 30 April) Power Law Index: 0.14 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

21 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of MAY 2008 (based on actual data of wind mast at site) Data : MAY 2008 Power Law Index: 0.37 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

22 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of JUNE 2008 (based on actual data of wind mast at site) Data : JUNE 2008 Power Law Index: 0.48 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) 1.15 Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

23 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of JULY 2008 (based on actual data of wind mast at site) Data : JULY 2008 Power Law Index: 0.45 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

24 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of AUGUST 2008 (based on actual data of wind mast at site) Data : AUGUST 2008 Power Law Index: 0.31 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

25 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of SEPTEMBER 2008 (based on actual data of wind mast at site) Data : SEPTEMBER 2008 Power Law Index: 0.25 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

26 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of OCTOBER 2008 (based on actual data of wind mast at site) Data : OCTOBER 2008 Power Law Index: 0.27 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

27 RAVI ENERGIE Appendix "MEP" PREPARED FOR 1250 kw WTG for the Month of NOVEMBER 2008 (based on actual data of wind mast at site) Data : NOVEMBER 2008 Power Law Index: 0.33 WTG Type: SUZLON S-66, 1250 kw Pitch Type Air Density at site: (kg/m3) Hub Height 74.5 m Air Density standard: (kg/m3) Location : Moti Sindholi, Gujarat, India Class Mid Wind Frequency Total Wind Speed Wind Speed Power Output Power Output Total Units Interval Speed Percent Hours at 65 m height at 74.5 m height at std. air density at site air density Generated m/s m/s % Hours m/s m/s kw kw kwh > Gross Generation at site air density (kwh) Correction Factor for Array Efficiency 92% Correction Factor for M/C Availability 95% Correction Factor for Grid Availibility 100% Expected net Generation after correction (kwh) Note: (1) AEP for 1250 kw WTG Prepared on the same line that of 1500 kw WTG provided by SEL (2) The actual wind speed data measured at site and provided by SEL are considered (3) Monthly air densities and power law indices have been provided by SEL based on wind mast data (4) Power Curve as per the test report DESI PV certified by Deutsches Windenergie Institut GmbH dated 3/3/2004

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