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NOTICE DATE:  September 29, 2017

NOTICE TYPE:  M-C092917-01 Operations

SHORT DESCRIPTION:  DAM and RTM system changes for the implementation of NPRR831

INTENDED AUDIENCE:  ERCOT Market Participants

DAYS AFFECTED:  October 31 - November 2, 2017

LONG DESCRIPTION:  In the R5 release, scheduled for October 31 - November 2, 2017, ERCOT will be making system changes for both the Day-Ahead Market (DAM) and the Real-Time Market (RTM) as part of the implementation of Nodal Protocol Revision Request (NPRR) 831, Inclusion of Private Use Networks in Load Zone Price Calculations.

For NPRR831, ERCOT will update market systems in order to calculate a net Load value for each Private Use Network (PUN) that will be included in the Load Zone price for all markets, DAM, RTM, and Congestion Revenue Right (CRR), when the Load is a net consumer from the ERCOT Transmission Grid. Specifically, ERCOT will make the following changes in R5:

********* Determine the appropriate Load distribution factors for PUNs, based on an estimated Load value considering historical net consumption at all PUNs.

********* Include the net PUN Load distribution factors in DAM, when allocating offers, bids, and Point-to-Point (PTP) Obligation bids with source and sink at a Load Zone.

********* Calculate the net Load value from State Estimator in Real-Time for each PUN when the PUN is a net consumer from the ERCOT Transmission Grid. The net Load value of the PUN will be included in the calculation of Real-Time Load Zone prices.

********* The load distribution factors for PUNs will be redacted from Electrical Bus Load distribution factors, and other information necessary to forecast Electrical Bus Loads, that are posted to the Market Information System (MIS) Public Area pursuant to Section 6.3.2.

Note that the R5 release will only implement associated system changes for DAM and RTM. The CRR portion of NPRR831 will be implemented as part of the CRR MUI Upgrade project on January 22, 2018. PUN net Load data will be redacted from the CRR Network Model postings for CRR Auctions occurring after this date.

CONTACT:  If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask]<mailto:[log in to unmask]>.

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