NOTICE DATE: April 28, 2017
NOTICE TYPE: M-C042817-01 Release - Wholesale
SHORT DESCRIPTION: Implementation of NPRR744
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: May 29 – June 2, 2017
LONG DESCRIPTION: ERCOT will be implementing Market Management System (MMS) and settlement changes for Nodal Protocol Revision Request (NPRR) 744, RUC Trigger for the Reliability Deployment Price Adder and
Alignment with RUC Settlement, between May 29 and June 2, 2017.
NPRR744 proposes to use a telemetered snapshot at the start of each Reliability Unit Commitment (RUC) block as a trigger for the adder created by NPRR626, Reliability Deployment Price Adder.
·
Security-Constrained Economic Dispatch (SCED) will take a snapshot of telemetered Resource status of the RUC-committed Resource for the first SCED run that the Resource is On-Line and available for SCED dispatch during the first
hour of the RUC block.
·
SCED will determine the buyback flag for the entire RUC block based on the telemetered status snapshot
o
If the snapshot status is ONOPTOUT, SCED will set the buyback flag to “YES” indicating that the Resource’s Qualified Scheduling Entity (QSE) successfully bought back the RUC block.
o
Otherwise SCED will set the buyback flag to “NO” indicating that the Resource’s QSE did not successfully buy back the RUC block.
·
SCED will use the RUC block and the determined buyback flag to validate the telemetered Resource status and override the telemetered status if it is inconsistent with the determined buyback flag.
·
SCED will use the determined buyback flag and the validated Resource status to trigger the Real-Time On-Line Reliability Deployment Price Adder (RTORDPA) calculation for the RUC block.
·
MMS will send XML notification messages to the affected QSE
o
When the buyback flag is set by SCED
o
When there is a Resource status override by SCED
NPRR744 impacts also include changes to the existing NP5-513-CD RUC Buy-Back Hours (Report Type ID 13102). This report will include the RUC buyback Resources and hours for current Operating Day to the MIS Secure Area on an hourly basis.
An updated Current Day Reports XSD will be posted in support of these report changes.
NPRR744 also puts into effect a new RUC Resource Buy-Back process by which a QSE can opt out of RUC Settlement using the buyback flag set by SCED telemetry, regardless of the timing of the notification of the RUC. This new process replaces
the current RUC Settlement opt out method using Current Operating Plan (COP) status.
·
Settlements will consume a new data element that identifies when a QSE has successfully opted out of RUC settlement, in accordance with ERCOT Protocols Section 5.5.2 (11). This new bill determinant, BUYBACK, will equal 1 if the
opt-out attempt is successful, 2 if the opt-out attempt is un-successful or no attempt is made, and 0 for hours that are not RUC-committed.
|
Bill Determinant |
Short Description |
Extract |
Extract Table |
|
BUYBACK |
RUC Buyback Flag |
RTM CODE |
MKTINPUTHEADER MKTINPUTINTERVAL |
·
RUC Buy-Back hours will still be communicated to the Market via the current RUC Bill Determinant with an hourly value of 5 for each RUC-committed hour found eligible for the RUC Resource Buyback provision.
·
RUC hourly values of 5 will still be considered not RUC-Committed for Settlement purposes.
ACTION REQUIRED: Implement changes to shadow Settlement systems for NPRR744.
NPRR744 and associated documents can be found on the ERCOT website.
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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