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CFE-ERCOT DC-Ties Commercial Operations

CFE-ERCOT DC-Ties Commercial Operations. ROS December 2007 Carlos Gonzalez-Perez ERCOT Operations Support. ERCOT DC-Ties. ERCOT-CFE Operational DC-Ties Eagle Pass (DC_S, 36 MW) Laredo Variable Frequency Transformer (DC_L, 100 MW) Sharyland Railroad (DC_R, 150MW)

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CFE-ERCOT DC-Ties Commercial Operations

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  1. CFE-ERCOT DC-Ties Commercial Operations ROS December 2007 Carlos Gonzalez-Perez ERCOT Operations Support CFE/ERCOT/AEP Meeting – Mexico City

  2. ERCOT DC-Ties • ERCOT-CFE 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 ROS Meeting – December 2007

  3. Commercial Operational Aspects ROS Meeting – December 2007

  4. Future Commercial Ops. of the DC-Ties • ERCOT management of the scheduling process in the South DC-Ties will be similar to the North DC-Ties • 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) ROS Meeting – December 2007

  5. ERCOT DC-Ties Scheduling Process ROS Meeting – December 2007

  6. Proposed Day Ahead Operations – Limit Calculations CFE Day Ahead Transfer Limits LIMIT Set to the Lower of all the Values ERCOT Day Ahead Transfer Limits Tie De-Ratings • Limits are initially calculated Daily (can be changed to weekly, etc) • CFE to provide ERCOT limits by 16:00 • Most constrained transfer limits will be made public and posted • Limits will be recalculated in real-time based on system conditions as needed ROS Meeting – December 2007

  7. Schedule Curtailment Process ROS Meeting – December 2007

  8. Inadvertent Accounting • Scheduled Energy: Calculated from the NERC E-Tag • Actual Energy: • Real-time SCADA hourly integrated. For hourly monitoring • EPS meter true-up 7 days after the fact • Daily Check-out: • Between ERCOT Operator and Tie Operator after midnight • Define payback in kind schedules, if the Inadvertent Balance larger than X MWh • Monthly True-up • Between CFE and ERCOT • Keeping up with the Inadvertent Account Balance ROS Meeting – December 2007

  9. Before going into Commercial Operations • Finalize Operating procedures for the South DC-Ties • Finalize an Emergency Assistance Agreement with CFE • Finalize Inadvertent agreement with CFE • CFE to have an E-Tag operation in place • ERCOT to finalize the testing of ERCOT systems • Tie Operator systems ready • CFE declare ready for Commercial Operations ROS Meeting – December 2007

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