NOTICE DATE: May 12, 2026

NOTICE TYPE: M-A051226-01 Financial/Credit

SHORT DESCRIPTION: Seasonal Variability Change in the Look-Back Period for RTLE of EAL Component

INTENDED AUDIENCE: All Market Participants

DAYS AFFECTED: May 16, 2026

LONG DESCRIPTION: Protocol language associated with Nodal Protocol Revision Request (NPRR) 1277, Revisions to the EAL Formula, was implemented on March 2, 2026.

As part of this NPRR, seasonal variability in the look-back period for the RTLE of the EAL component has been introduced as follows:

• 40 days from May 16 through September 15 (Summer Period)
• 20 days from September 16 through May 15 (Non-Summer Period)

Note: The look-back period does not apply to traders.

Effective May 16, 2026, the look-back period will increase from 20 days to 40 days and will remain in effect through September 15, 2026.

Market Participants are advised to monitor their Credit Monitoring and Management Reports and manage Collateral positions accordingly.

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 ClientServices@ercot.com.

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