NOTICE DATE:  May 20, 2011

NOTICE TYPE:  M-A052011-01 NPRR

SHORT DESCRIPTION:  Implementation details of NPRR282

INTENDED AUDIENCE:  QSEs with Resources

DAYS AFFECTED:  July 1 and 22, 2011

LONG DESCRIPTION:  On July 22, 2011, ERCOT will implement Nodal Protocol Revision Request (NPRR) 282, Dynamic Ramp Rates Use in SCED, which was approved by the ERCOT Board on March 22, 2011. NPRR282 requires the use of telemetered ramp rates by the Resource Limit Calculator (RLC) in calculating the Security-Constrained Economic Dispatch (SCED) Up and Down Ramp Rates (SURAMP and SDRAMP). The SURAMP and SDRAMP are then used in the calculation of High Dispatch Limit (HDL) and Low Dispatch Limit (LDL). These telemetered ramp rates will replace the static ramp rates, which are used currently. NPRR282 requires additional Inter-Control Center Communications Protocol (ICCP) data to be provided to ERCOT by each Resource’s Qualified Scheduling Entity (QSE).

ERCOT will create four new ICCP points for each Resource modeled after the existing two points for each Resource by June 15, 2011. The new ICCP points will become live in ERCOT production system on July 1, 2011. Therefore, QSEs are requested to create corresponding new ICCP points in their respective systems by July 1, 2011. 

QSEs may contact the ERCOT ICCP team at [log in to unmask] for information on the new points created in the ERCOT system and for any guidance in implementation of new ICCP points in their respective systems.

ERCOT intends to utilize new and live ICCP telemetry points in an internal test environment from July 1, 2011, in preparation for migration of NPRR282 software to ERCOT production system on July 22, 2011.

Examples of the above changes will be incorporated in the ICCP Handbook following the established ERCOT approval process for changes to the Handbook.

ACTION REQUIRED:  QSEs are to coordinate with their Resources to modify necessary dispatch systems and provide telemetered data to ERCOT via ICCP for each Resource’s Normal Up Ramp Rate, Normal Down Ramp Rate, Emergency Up Ramp Rate and Emergency Down Ramp Rate by July 1, 2011.

Removal of existing Normal Ramp Rate and Emergency Ramp Rate is planned after implementation of NPRR282 is complete. 

Examples of the existing Object Names to be deleted are as follows:

QSEs should immediately notify their ERCOT Account Manager if the QSE cannot complete necessary dispatch system changes by the planned ERCOT ICCP data production migration date of July 1, 2011.

ADDITIONAL INFORMATION:  Pursuant to Protocol Section 21.6, Nodal Protocol Revision Implementation, ERCOT is required to provide notice as soon as practicable, but no later than ten days prior to implementation.

NPRR282 and associated documents can be found on the ERCOT website, under Market Rules, at http://www.ercot.com/mktrules/issues/nprr/276-300/282/index.

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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