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].
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are receiving email from an ERCOT distribution list that you no longer wish to receive,
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dh