Update: ERCOT To Seek Board Review Of DAM Prices For Certain September Operating Days, Due To Erroneous Withdrawn Outage Modeling

As previously reported (details here), on October 3, 2019, ERCOT issued Market Notice M-A100319-01 informing Market Participants that Day-Ahead Market (DAM) prices were under investigation for Operating Days (ODs) September 16-23, 2019.

In such October 3 notice, ERCOT notified Market Participants that certain withdrawn Outages (i.e., Outages that had been withdrawn before their planned outage start date) were erroneously modeled in the DAM as out-of-service for the affected ODs. In other words, some in-service Transmission Elements were identified as out-of-service in ERCOT’s network model when clearing the DAM for the affected ODs.

In a new market notice dated October 9, ERCOT said that, "ERCOT has determined that DAM clearing was impacted for all of the affected ODs[.]"

ERCOT said in the October 9 market notice that it will seek ERCOT Board review of the following DAM prices:

• Day-Ahead Settlement Point Prices (DASPPs);

• DAM Market Clearing Prices for Capacity (MCPCs); and

• DAM Locational Marginal Prices (LMPs) for Electrical Buses.

ERCOT said in the market notice supporting documents and re-calculated prices will be included in materials for the December 2019 ERCOT Board meeting.