NOTICE DATE: December 10, 2019
NOTICE TYPE: M-A102419-03 Settlements
SHORT DESCRIPTION: ERCOT Board approval of Real-Time market (RTM) price corrections for Operating Days (ODs) October 16 - 20, 23 24, 26, 29
31, 2019, and November 4
& 6, 2019
INTENDED AUDIENCE: QSE and CRRAH Settlement Personnel
DAYS AFFECTED: October 16 - 20, 23 24, 26, 29 31, 2019, and November 4 & 6, 2019
LONG DESCRIPTION:
On October 21, 2019, ERCOT became aware of a software error that occurred during an update to ERCOTs Energy and Market Management System (EMMS), and immediately implemented an emergency fix and began investigating
RTM prices for Operating Days (ODs) October 16 21, 2019. ERCOT determined that the software error resulted in incorrect
Real-Time Locational Marginal Prices (RTLMPs), Real-Time Settlement Point Prices (RTSPPs), Real-Time Settlement Point Prices for Energy-Weighted (RTSPPEWs), and Real-Time Prices for
Energy Metered for Resources (RTRMPRs) for certain intervals on ODs October 16 21, 2019. On October 24, 2019, ERCOT notified Market Participants that it would be seeking ERCOT Board review of such
prices. See Market Notice M-A102419-01.
On November 14, 2019, ERCOT issued a second notice informing the market that ERCOT identified a separate but related software error that impacted ODs October 16, 2019 November 7, 2019. ERCOT informed Market
Participants that there were no pricing impacts to the ODs affected by the original software error (i.e., ODs October 16 21, 2019). ERCOT further noted that there were no pricing impacts to ODs October 22, 25, 27 28, 2019, November 1 3, 5 or 7, 2019,
as a result of the separate but related software error. However, for ODs October 23 24, 26, 29 31, 2019, and November 4 and 6, 2019, ERCOT determined that the second software error impacted prices, and therefore, ERCOT stated that it would be recommending
these additional ODs to the Board for review of prices. See Market Notice M-A102419-02.
On December 10, 2019, the ERCOT Board reviewed RTLMPs, RTSPPs, RTRMPRs, and RTSPPEWs for ODs October 16
20, 23 24, 26, 29 31, 2019, and November 4 & 6, 2019, determined that such prices were significantly affected by a software error, and directed ERCOT to
implement the appropriate price corrections pursuant to ERCOT Protocol Section 6.3(4).
See
ERCOT Board of Directors Meeting (December 10, 2019) Agenda
Item No. 9.
In accordance with the RTM Settlement posting dates per the
Settlement Calendar, ERCOT will include the price corrections in the RTM Final Statements for ODs October 16 20, 23 24, 26, 29 31, 2019, and November 4 & 6, 2019.
ADDITIONAL INFORMATION:
The corrected prices will be posted in both CSV and XML formats in the
RTM Price Corrections folder.
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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