NOTICE DATE:  July 30, 2010

NOTICE TYPE:  M-A073010-01 Operations

SHORT DESCRIPTION:  ERCOT instructions issued to QSEs for frequency and system security

INTENDED AUDIENCE:  QSEs with Resources

DAY AFFECTED:  August 9, 2010
LONG DESCRIPTION:  ERCOT Operations is updating the procedures used to maintain frequency and system security. The update pertains to procedures during periods where Regulation Service up or down is exhausted and circumstances require command and control actions.
During real-time operations when Regulation Service up is exhausted, ERCOT will manually deploy Responsive Reserve Service (RRS) if it determines it is necessary to help restore the frequency of the interconnected transmission system.
During real-time operations when Regulation Service down is exhausted, ERCOT will identify the Qualified Scheduling Entity or Entities (QSE/QSEs) with positive Schedule Control Error (SCE) and issue fleet Out of Merit Order (OOM) down instructions. ERCOT will issue fleet OOME instructions to QSEs with positive SCE first, in order to manage system security if it determines that it is necessary to restore Regulation Service down.
ACTION REQUIRED:  The QSEs providing RRS shall meet the deployment performance requirements specified in Section 6.10.4, Ancillary Service Deployment Performance Measures.
QSEs will be required to respond to fleet down OOME instructions.
ADDITIONAL INFORMATION:  The following definition and Protocol sections are provided for reference:
Responsive Reserve Service
Responsive Reserve consists of the daily operating reserves that are intended to help restore the frequency of the interconnected transmission system within the first few minutes of an event that causes a significant deviation from the standard frequency.
6.7 Deployment Policy
Energy from Ancillary Services may be deployed by ERCOT, only in the Operating Period, and only for reliability reasons in order to maintain frequency and system security. Energy will be deployed from Ancillary Services as prescribed by their specific function and may not be used to substitute for other services because of price except as permitted under 6.6.3.1 (10). ERCOT shall deploy all services other than Regulation in a minimum of one (1) Mw blocks.
6.7.7.1 Deployment of Fleet/Zonal OOME

(1)  During circumstances when command and control actions are required, ERCOT may instruct one or more specific QSEs to adjust their total ERCOT generation level or their generation level in a specific Congestion Zone (Zonal) or across all zones (Fleet). The Dispatch Instruction includes the quantity of energy required and the Congestion Zone(s), if applicable, but does not specify which Generation Resource(s) the QSE(s) should move. Such a Dispatch Instruction will be referred to as a "Fleet/Zonal OOME Dispatch Instruction."

(2)  A Fleet/Zonal OOME Dispatch Instruction will be treated as an instructed deviation for Settlement purposes. When ERCOT issues a Fleet/Zonal OOME Dispatch Instruction, the resulting instructed deviation from the Fleet/Zonal OOME Dispatch Instruction will be defined by the MW amount as specified in the Fleet/Zonal OOME Dispatch Instruction.

(3)  A Fleet/Zonal OOME Dispatch Instruction will be included in the calculation of the SCE. The Dispatch Instruction will not be constrained by ramp rate; therefore, the change will be considered a step change.

(4)  ERCOT will send Fleet/Zonal OOME Dispatch Instructions to QSEs concurrent with Balancing Energy Service Dispatch Instructions for the target interval.

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 Relations via email at [log in to unmask]<blocked::mailto:[log in to unmask]>.
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