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By Keith Casey ISO Department of Market Analysis February 8, 2000

ISO Department of Market Analysis Analysis of Day Ahead Congestion Costs, Curtailments, and Unscheduled ETC Transmission Capacity. By Keith Casey ISO Department of Market Analysis February 8, 2000. SP15. NP15. SP15+NP15. S NP15. Demand NP15+SP15. Demand SP15. Demand NP15. S SP15.

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By Keith Casey ISO Department of Market Analysis February 8, 2000

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  1. ISO Department of Market Analysis Analysis of Day Ahead Congestion Costs, Curtailments, and Unscheduled ETC Transmission Capacity By Keith Casey ISO Department of Market Analysis February 8, 2000 ISO Department of Market Analysis

  2. ISO Department of Market Analysis

  3. SP15 NP15 SP15+NP15 SNP15 DemandNP15+SP15 DemandSP15 DemandNP15 SSP15 SupplyNP15+SP15 PU Gen. Cost Export to NP15 Gen. Cost QTOTAL QNP15 QSP15 Market Results: No Congestion on Path 15 Market Results: Congestion (Path 15 Rating = 0) SP15 NP15 SNP15 DemandSP15 DemandNP15 = Cost Savings to SP15 Load SSP15 PNP15 PU PSP15 = Cost Increase to NP15 Load Gen. Cost Gen. Cost QNP15 QSP15 ISO Department of Market Analysis

  4. Day-ahead Import Curtailments of COI (Apr 98 - Mar 99) ISO Department of Market Analysis

  5. Day-ahead Import Curtailments of COI (Apr 99 - Nov 99) ISO Department of Market Analysis

  6. Day-ahead South to North Curtailments of Path 15 (Dec 98 - Nov 99) ISO Department of Market Analysis

  7. Day-ahead North to South Curtailments of Path 15 (Dec 98 - Nov 99) ISO Department of Market Analysis

  8. Day-ahead Import Curtailments of NOB (Feb 99 - Nov 99) ISO Department of Market Analysis

  9. Day-ahead Import Curtailments of Palo Verde (Feb 99 - Nov 99) ISO Department of Market Analysis

  10. Day-ahead Import Curtailments of Eldorado (Feb 99 - Nov 99) ISO Department of Market Analysis

  11. Methodology for Calculating Curtailments For hours having day ahead congestion on COI: • Actual Curtailments = Initial New Firm Use (NFU) Schedule - Final NFU Schedule • Unscheduled ETC Capacity = Hour ahead TTC - Total Real-Time Schedules* • Estimated curtailments if unscheduled ETC was available to the day ahead market = Max (0, Actual Curtailments - unscheduled ETC capacity) * Real-time Schedules refers to final tie-point schedules at the end of the ETC scheduling deadline of 20 minutes prior to the operating hour. ISO Department of Market Analysis

  12. Potential Annual Cost Savings to Load from Making ETC Capacity Available to the Day Ahead Market(Dec 98 - Nov 99) ISO Department of Market Analysis

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