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Day-Ahead External Node Net Commitment Period Compensation (NCPC) Related Language Changes

This document outlines the updates approved by the FERC in February 2009 regarding the allocation of Day-Ahead Non-Commitment Period Compensation (NCPC) charges for external transactions. Key changes include a revised allocation method based on hourly metrics, inclusion of virtual transactions in NCPC credits, and clarification of the load obligation criteria at external locations. The intent is to ensure consistency with the approved rules while not affecting the overall market design or settlement implementation. These language adjustments are vital for accurate NCPC calculation and charge allocation.

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Day-Ahead External Node Net Commitment Period Compensation (NCPC) Related Language Changes

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  1. Day-Ahead External Node Net Commitment Period Compensation (NCPC) Related Language Changes Markets Committee September 22, 2009 Jinye Zhao, Market Development

  2. Background • In Feb 2009, FERC accepted the rule changes regarding the allocation for Day-Ahead NCPC for External Transactions proposed by the ISO. • The settlement software which implements the revision was put into production in August 2009.

  3. Approved Rule Changes • Change the allocation of External Node NCPC charges from all Day-Ahead Load Obligations to the load at the external location as defined by the prevailing flow; • Change the method for calculating the allocation of NCPC at external locations from a 24-hour commitment period basis to an hour-by-hour basis; and • Make virtual transactions eligible for NCPC credits and charges at the External Node.

  4. Why Need Language Changes? • Current language in some Market Rule sections has been identified that is not consistent with the approved rule changes. • The  proposed language changes do not modify the market design and have no impact on settlement implementation.  

  5. Issue 1 • Include virtual transactions into the calculation of Day-Ahead NCPC credits at external nodes.

  6. Issue 2 • Clarify the allocation of Day-Ahead NCPC charges associated with External Nodes • Section III.F.2.3.6: For each External Node, the Day-Ahead External Transaction purchase Credits for each External Transaction purchase or Increment Offer cleared in each hour are allocated to the Day-Ahead External Transaction sales or Decrement Bids cleared in the hour at that External Node.  • Section III.F.2.4.6: For each External Node, the Day-Ahead External Transaction sale Credits for each External Transaction sale or Decrement Bid cleared in each hour are allocated to the Day-Ahead External Transaction purchases or Increment Offers cleared in the hour at that External Node.

  7. Issue 3 • Exclude external transactions (physical and virtual) from the calculation of the daily total Day-Ahead economic and Local Second Contingency Protection Resource NCPC costs.

  8. Issue 4 • Clarify the hourly allocation of Day-Ahead Local Second Contingency Protection Resource NCPC charges and Day-Ahead economic NCPC charges associated with External Nodes

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