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NOTICE DATE: October 16, 2020

NOTICE TYPE: W-A100917-03 Operations

SHORT DESCRIPTION: Proposal to Modify Mitchell Bend Remedial Action Scheme


DAY AFFECTED: October 23, 2020

LONG DESCRIPTION: ERCOT has received a proposal from Oncor Electric Delivery Company LLC (Oncor) to modify the Remedial Action Scheme (RAS) at Mitchell Bend. The Mitchell Bend RAS is designed to prevent thermal overloads on the Mitchell Bend to Rocky Creek 345 kV transmission line (152_A) and the Mitchell Bend to DeCordova 345 kV transmission line (6017_A). Oncor's proposal recommends the removal of monitoring of the Mitchell Bend to Rocky Creek 345kV transmission line (152_A) due to upgrades. The proposal also recommends changing the monitoring of the Mitchell Bend to DeCordova 345 kV transmission line (6017_A) to monitoring of the Mitchell Bend to Carmichael Bend 345 kV transmission line (6017_B) due to changes to the DeCordova (Carmichael Bend) substation.

The proposed modification to the Mitchell Bend RAS is being reviewed by ERCOT.

ACTION REQUIRED: Comments on the proposal are due by October 23, 2020, and should be submitted to [log in to unmask] using the attached comment form. Any questions or concerns submitted by this date will be addressed by ERCOT or Oncor.

ADDITIONAL INFORMATION: Information regarding all RASs can be found in the “Remedial Action Schemes and Constraint Management Plans” secure portlet located on the Market Information System (MIS) Long-Term Planning page.

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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