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Impact of NPRR 520 (SCED CCT)

Impact of NPRR 520 (SCED CCT). Market Analysis ERCOT. Background of NPRR 520 (SCED CCT). Why Change? SCED over-mitigation issues What Changed? No Monthly and Daily Constraint Competitiveness Test (CCT) SCED CCT runs every 5 minutes (or whenever SCED is executed)

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Impact of NPRR 520 (SCED CCT)

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  1. Impact of NPRR 520 (SCED CCT) Market Analysis ERCOT

  2. Background of NPRR 520 (SCED CCT) • Why Change? • SCED over-mitigation issues • What Changed? • No Monthly and Daily Constraint Competitiveness Test (CCT) • SCED CCT runs every 5 minutes (or whenever SCED is executed) • Less set of Resources get mitigated • Minimizing unnecessary Base Point oscillations/QSGR dispatch

  3. System Lambda Increase

  4. Mitigation Ratio

  5. Increased Peaker Net Margin (PNM)

  6. Pivotal Players For Each Active Constraint (7/1-7/30) (Continued)

  7. Pivotal Players For Each Active Constraint (7/1-7/30) (Continued)

  8. Top 10 Non-Competitive Constraints

  9. Constraints with Both Competitiveness Status (7/1-7/30)

  10. Summary of Impact of NPRR 520 • Average number of mitigated resources for each SCED interval: • Old: 100% vs. New: 4.8% • Average system lambda increase: • $0.2/MWh for 744 hours. • Cumulative PNM increase: • $80.63/MW. • Total number of non-competitive constraints: •   Old: ~100% vs. New: 95%

  11. Next Step • Shall we use HDL instead of HSL for CCT calculation? • Shall we include all online Resources’ LDL as base load? • Shall we use sf*HSL instead of sf*sf*HSL for ECI calculation?

  12. Thanks!

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