NPRR NPRR As-Built Hub and Load Zone Calculation Number Title Date of Decision March 8, 2018 Action Recommended Approval Timeline Urgent Proposed Effective May 1, 2018 Date Priority and Rank Not Applicable Assigned 2.1, Definitions, 3.4, Load Zones 3.5.2.1, North 345 kV Hub (North 345) 3.5.2.2, South 345 kV Hub (South 345) Nodal Protocol 3.5.2.3, Houston 345 kV Hub (Houston 345) Sections Requiring 3.5.2.4, West 345 kV Hub (West 345) Revision 3.5.2.6, ERCOT Bus Average 345 kV Hub (ERCOT 345 Bus) 4.5.1, DAM Clearing Process 4.6.1.2, Day-Ahead Settlement Point Prices for Load Zones 7.5.1, Nature and Timing Related Documents Requiring Revision/ None Related Revision Requests This Nodal Protocol Revision Request (NPRR) modifies the Hub Bus and Load Zone definitions and price calculations to account for the current usage of power flow buses as opposed to Electrical Buses in the Day-Ahead Market (DAM) and Congestion Revenue Right (CRR) Auction systems. In some cases there can be differences between Revision Description power flow buses and Electrical Buses, and it is more suitable for power flow buses to be used. Real-Time currently uses Electrical Buses for the Hub and Load Zone calculations. Further, the rewritten formulas provide clarification for the scenario when buses are energized in contingency analysis. Addresses current operational issues. Meets Strategic goals (tied to the or directed by the ERCOT Reason for Revision Board). Market efficiencies or enhancements
NPRR Number NPRR Title As-Built Hub and Load Zone Calculation Date of Decision March 8, 2018 Action Recommended Approval Timeline Urgent Proposed Effective Date May 1, 2018 Priority and Rank Assigned Not Applicable Nodal Protocol Sections Requiring Revision 2.1, Definitions, 3.4, Load Zones 3.5.2.1, North 345 kV Hub (North 345) 3.5.2.2, South 345 kV Hub (South 345) 3.5.2.3, Houston 345 kV Hub (Houston 345) 3.5.2.4, West 345 kV Hub (West 345) 3.5.2.6, ERCOT Bus Average 345 kV Hub (ERCOT 345 Bus) 4.5.1, DAM Clearing Process 4.6.1.2, Day-Ahead Settlement Point Prices for Load Zones 7.5.1, Nature and Timing Related Documents Requiring Revision/ Related Revision Requests None Revision Description This Nodal Protocol Revision Request (NPRR) modifies the Hub Bus and Load Zone definitions and price calculations to account for the current usage of power flow buses as opposed to Electrical Buses in the Day-Ahead Market (DAM) and Congestion Revenue Right (CRR) Auction systems. In some cases there can be differences between power flow buses and Electrical Buses, and it is more suitable for power flow buses to be used. Real-Time currently uses Electrical Buses for the Hub and Load Zone calculations. Further, the rewritten formulas provide clarification for the scenario when buses are in contingency analysis. Reason for Revision Addresses current operational issues. Meets Strategic goals (tied to the or directed by the ERCOT Board). Market efficiencies or enhancements energized