NOTICE DATE:  September 2, 2011

NOTICE TYPE:  W-A090211-01 Extracts - Wholesale

SHORT DESCRIPTION:  NP6-622-ER State Estimator Transformer Information Report contains multiple data records for the same piece of equipment for the same moment in time

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  September 2, 2011

LONG DESCRIPTION:  The NP6-622-ER State Estimator (SE) Transformer Information Report contains multiple data records for the same piece of equipment for the same moment in time. This is a result of data processing behavior that ERCOT is experiencing between the EMS source system and replication for reporting. Currently, our replication process is committing records at a 1 second interval based on the snapshot data from the EMS source system. The EMS source system, however, has the capability of changing data element measurements at a sub-second interval. This creates the opportunity for the reporting system to have multiple data records for the same second for a given element.

ERCOT development is currently working on a solution to be implemented Q4 2011 that will provide unique measurements for each piece of equipment for each SE execution.

CONTACT:  If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask].

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