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Enron Mail |
Mark, as per our discussion I will require the Feb. curtailment at Clear Sky
to calculated using the same methodology as was used in the latest March calculation. This data is required for the March owner report which must be sent to the owner today. Thank you very much for your understanding and support regarding this issue. KA Mark Fisher 04/19/2002 09:07 AM To: Jay Godfrey/EWC/Enron@ENRON, Kurt Anderson/EWC/Enron@ENRON, Bo Thisted/EWC/Enron@Enron, Hollis Kimbrough/EWC/Enron@ENRON cc: Subject: CLear Sky/Trent Comparison Explainations: Predicted: For each 10 minute interval and each turbine the wind speed was converted to a power. The power for each 10 minute interval was then averaged, to produce a mean power for the site. This number was then scaled by the number of turbines to produce a site wide power value, that value was then converted to an energy value. Curtailment: Curtailment logs were provided by the site giving the turbine number and the start and stop time of the curtailment. For each curtailment period the wind speed was found. Due to the fact that wind speeds are lower on non-producing turbines, the wind speed was scaled up by approximately 5%. This wind speed was then converted to power, and then energy. The value of the curtailment number is the sum for all curtailments. Unavailable: The Curtailment value was removed from the predicted production and the result multiplied by the site availability. Difference: This is a sum total, removing the Curtailment and unavailable from the predicted. Line loss: This is 98% of the Difference to estimate a 2% line loss. Net: Is the difference of Difference and line loss. Actual: Is taken directly from the Substation Variance: Is the difference between the Net and Actual Curtailed production: Is the amount of energy not produced due to curtailment. 97% Availability: Is 97% of the curtailed production. 2% line loss: Is 98% of the value in 97% availability Billable Curtailment: Is the value for Curtailment after both availability and line loss are taken into account.
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