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CFE – ERCOT DC-Ties Commercial Operations

This document outlines the commercial operations of DC ties in South Texas managed by ERCOT. It includes details on tie operators, limit calculations, curtailment processes, and necessary systems in place for seamless operations.

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CFE – ERCOT DC-Ties Commercial Operations

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  1. CFE – ERCOT DC-TiesCommercial Operations Colleen Frosch ERCOT System Operations

  2. ERCOT DC-Ties • CFE - ERCOT Operational DC-Ties • Eagle Pass (DC_S) 36 MW • Laredo Variable Frequency Transformer (DC_L) 100 MW • Sharyland Railroad (DC_R) 150MW • ERCOT - SPP Operational DC-Ties • North DC-Tie (DC_N) 220 MW • East DC-Tie (DC_E) 600 MW DC_N 220 MW DC_E 600 MW DC_S 36 MW DC_L 100 MW DC_R 150 MW

  3. Commercial Operations of the South Ties • ERCOT management of the scheduling process in the South DC-Ties will be similar to the North DC-Ties • AEP Corpus Christi will be the Tie Operator • Minimal modifications to the ERCOT systems will be necessary • CFE to establish a NERC E-Tag operation for transactions between Mexico and ERCOT (and vice versa)

  4. Day-Ahead Operations - Limit Calculations Limit set to the lower of all values CFE Day Ahead Limit Transfers ERCOT Day Ahead Limit Transfers DC-Tie Limitations • Limits calculated daily • CFE to provide ERCOT limits by 16:00 • Limits will be made public and posted • Limits will be recalculated in real-time based on system conditions

  5. Posting Daily Limits Limits for South Ties will be on Daily Limits Sheet Update Real-Time Data page to include DC-Tie Limits

  6. Curtailment Process • Limits will be recalculated in real-time based on system conditions • ERCOT/CFE will identify the amount that needs to be curtailed • The last approved E-tag will be the first to be curtailed.

  7. To Be Completed before Commercial Operations begins • Finalize Inadvertent agreement with CFE • Business Processes in place for ERCOT/CFE/AEP • CFE E-Tag System in place • AEP Tie Operator systems ready • CFE declare ready for Commercial Operations

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