NOTICE DATE: March 29, 2023

NOTICE TYPE: M-B032923-01 Extracts

SHORT DESCRIPTION: AMS Supplemental Extract - Additional posting for March 29, 2023

INTENDED AUDIENCE: All Market Participants utilizing the AMS Supplemental Extract

DAYS AFFECTED:  March 29, 2023

LONG DESCRIPTION: It was recently reported to ERCOT that there is a one day delay in the posting of Supplemental AMS Interval Data Extract (COMS-456 | Rpt ID 1040). This extract provides subscribed Market Participants with AMS interval data for all ESI IDs owned by them three days after the interval data is loaded in ERCOT data systems and aligns to the same data loading addtimes as the ESIID Service History and Usage Extract (ZP12-245 | Rpt ID 210). This delay occurred on 04/05/2022 and has resulted in a one day delay in posting for all posting dates forward. To realign with the correct data addtimes, ERCOT ran and posted an additional run for this extract today, 03/29/2023. Subscribed entities will see two Supplemental AMS Interval Data Extract postings in their certified Market Information System (MIS) folders today. Going forward this extract will again be in alignment with the ESIID Service History and Usage extract timeframes associated with these data sets.

ADDITIONAL INFORMATION: All AMS interval data provided through the affiliated Market Data Transparency Web Services (ZP12-540), the ESIID Service History and Usage Extract (ZP12-245 | Rpt ID 210) and the Supplemental IDR Required Interval Data Extract (COMS-457 | Rpt ID 1041) remained current and unaffected by the posting delay.

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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