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The contractual availability definition in the owner report is the same used
throughout 2002 and implements the contractual availability definition upon which annual availability warranty calculations are based. Contractual availability is defined (Survey - DT -RT -MT - LOT)/(Survey - LOT - MTprorated) where Survey is the maximum possible number of hours in the calendar period and MTprorated is the percent of the 48 hours of maintenance per year credit that can be taken credit for. DT, RT, MT, and LOT are controller counters that accumulate the hours, to the nearest second, that the turbine is in a downtime fault, repairtime, maintenance time, or line out condition. The DT, RT, MT, and LOT values are corrected for communication loss at the beginning and ending of the time period of interest. The correction is based on counter values in the next or previous time interval and is not based on an assumed 90% of communication loss rule. I assume that Mr Marshall means wind direction curtailment by his phrase "columnar shut-down". The wind direction curtailment is not yet implemented in the field and therefore there are no downtime losses. The curtailment info sent earlier by Mark Fisher was "utility" and not "wind direction curtailment". W.C. Marshall, as per the note below, has already provided the availability figures for Jan and Feb 2002. The performance testing results must come from Engineering. System Performance Group is not involved. The transfer function to compute m/s windspeed for the NRG #40 anemometers is (0.765*Hz)+0.35. Kurt Anderson 05/28/2002 08:41 AM To: Bo Thisted/EWC/Enron@Enron, Mark V Walker/EWC/Enron@ENRON cc: Hollis Kimbrough/EWC/Enron@ENRON Subject: Desert Sky Bo and Mark, I need some help on the note below. Please review Ward's e-mail below and provide the information and or explanation as appropriate. I am tied up on another project and would really appreciate your help, please call if you have any questions. Thank you KA ---------------------- Forwarded by Kurt Anderson/EWC/Enron on 05/28/2002 08:51 AM --------------------------- wcmarshall@aep.com on 05/28/2002 06:49:26 AM To: Kurt.Anderson@enron.com cc: rmalbarano@aep.com, rboteler@aep.com, peter.simpson@garradhassan.co.uk Subject: Desert Sky Can you help me find the following information for Peter Simpson. ?I have attached the April Status Report which should answer the Jan and Feb availability question. Renee.............Kurt may need to know what availability and wind speed data was sent to Peter. The following information would also be helpful: - definition of the availability figure given in the monthly availability report, in particular the definition of the numerator shown in the spreadsheet; - duration of down-time due to columnar shut-down; - availability figures for January and February 2002; - if available, any results from performance testing undertaken to date; - the transfer functions that have been applied to the wind speed data provided. Regards, Peter Simpson Ward C. Marshall Director, Business Development AEP Energy Services, Inc. Office (614) 583-6607 Fax ? ? (614) 583-1627 Cell ? ? (614) 736-6022 Mailing Address: PO Box 16036 Columbus, OH 43216-0036 Physical Address: 155 W. Nationwide Blvd. Suite 500 Columbus, OH 43215 - 0402 Desert Sky Monthly Site Report[1].pdf
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