NOTICE DATE: September 25, 2023
NOTICE TYPE: W-A092523-01 Operations
SHORT DESCRIPTION: Implementation of maximum shadow price for an irresolvable constraint in SCED
INTENDED AUDIENCE: ERCOT Market Participants
DAY AFFECTED: September 25, 2023
LONG DESCRIPTION: ERCOT has identified a transmission constraint that has met the criteria of being considered irresolvable on September 23, 2023, per the criteria defined in Section 3.6.1 of the business practice document, “Setting the Shadow Price Caps and Power Balance Penalties in Security Constrained Economic Dispatch.” The update to the maximum Shadow Price will occur between 3:00 PM and 4:00 PM Central Prevailing Time (CPT) on September 25, 2023 and will become effective immediately. The updated maximum Shadow Price will remain in effect until otherwise notified through a Market Notice. The contingency/constraint pair and updated maximum shadow price (set in accordance with Section 3.6.2 of that same document) are as follows:
| Contingency Name |
Constraint Name |
From Station/kV |
Description |
Maximum Shadow Price |
| SCARBU28 |
CKT_979_1 |
MAGPLANT /138 |
Loss of the 138 kV line from Cardinal Lane to Burleson Aen overloading the 138 kV line from Magnesium Plant to Northland |
2,000 $/MWh |
This new maximum shadow price will be used for all constraints in SCED sharing the same monitored element (i.e. constraint name) and direction.
ADDITIONAL INFORMATION: The business practice document is posted under Key Documents on the Real-Time Market webpage at http://www.ercot.com/mktinfo/rtm/.
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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