CRR Model Building Process

1. CRR Model Building Process Bradley Bell CRR Engineer

2. Intro: Model Building Process • Model Building Environment • Model Building Timetable • Building Contingency File • Outages / Outage Selection Process • Running Topology Processor • Post Processing Model

3. Overview NMMS Database Topology Processor CRR Model Transmission Outages

4. Model Building Environment • CRR Model Building Server • - IMM • - TP • Snapshot of NMMS model • One instance of NMMS model

5. Timeline (Monthly Model) • Model building process will start 6-8 business days before model posting date on CRR calendar.

6. Outage Pull Date

7. Timeline (Annual Auction)

8. Create Contingency File NMMS Model CIM Model Contingency Building Program Create NOMCR containing CIM Model w/contingencies CIM Model Including Contingencies

9. OUTAGES

10. Outage Query WHERE outage.CATEGORY = 'Transmission‘ AND outage.planned_end_date >= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 1)) -- this gives you the current month plus 2 AND outage.planned_start_date <= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 2))-- this gives you the current month plus 3 AND outage.status IN ('Apprv', 'Accpt') OR ( outage.status = 'Withd’) AND outage.planned_end_date >= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 1)) -- this gives you the current month plus 2 AND outage.planned_start_date <= (ADD_MONTHS (TRUNC (LAST_DAY (SYSDATE) + 1), 2)) -- this gives you the current month plus 3 AND outage.actual_start_date IS NOT NULL AND outage.actual_end_date IS NULL AND outage.CATEGORY = 'Transmission');

11. Outages / Outage Selection Process • Nodal Operating Guides 5.5(6): System Modeling Information • (6) Congestion Revenue Right (CRR) Network Model Outage determination uses network topology of the CRR Network Model identified by ERCOT. This must include Planned Outages of Transmission Elements approved by ERCOT at the time the CRR Network Model is being built and that demonstrate significant impact to the transfer capability during the effective period.  ERCOT will consider including Outages in the CRR Network Model that are scheduled to occur in the relevant time period and meet one or more of the following criteria: • (a) Consecutive or continuous approved Outages greater than or equal to five days; • (b) Approved Outages which include Transmission Elements included in the definition of a Hub; • (c) Approved Outages which include Transmission Elements in a 345 kV Transmission Facility; • (d) Approved Outages that require the use of a Block Load Transfer (BLT); and • (e) Any other approved Outage that has been determined by ERCOT to carry a substantial risk of causing significant congestion.

12. Gantt Chart

13. Gantt Chart

14. Outage Dates

15. Outage Date Selection • Market Operator (MO) uses the base case flows in the On-Peak SSWG case for the appropriate year and season to qualitatively estimate the severity of the outaged lines. • MO chooses the worst day of the month based on the evaluation from the step above as well as special consideration given to (in descending order) outages involving: • Lines in the W->N constraint • Lines in the N->H constraint • Lines involved in other 2010 CSCs/CREs • MO imports the outages into TP the and builds the network model based on those outages.

16. Topology Processor • Create a basecase model and a model with outages • Insert dynamic ratings for each weather zone from 10 year historical average • Create RAW file and CRR output files

17. Post Process Model • Manually Create • Flowgate rights list and definition • Contingency list and definition • Non-Thermal Constraints list and definition • Monitored Lines and Transformers • CRR to Operations name mapping document • Model Comparisons

18. QUESTIONS?