***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: September 29, 2017 NOTICE TYPE: M-D092917-01 Settlements SHORT DESCRIPTION: Implementation Details for NPRR782 INTENDED AUDIENCE: ERCOT Market Participants and Settlement Personnel DAY AFFECTED: October 31 - November 2, 2017 LONG DESCRIPTION: ERCOT will be implementing changes for Nodal Protocol Revision Request (NPRR) 782, Settlement of Infeasible Ancillary Services Due to Transmission Constraints, between October 31 and November 2, 2017. New Settlement Calculations: The following section and charge types have been added with NPRR782: 6.7.2.1 Charges for Infeasible Ancillary Service Capacity Due to Transmission Constraints (1) A charge to each QSE with Ancillary Service Supply Responsibility that is deemed infeasible by ERCOT as a result of a transmission constraints, whether or not a SASM is executed, is calculated as follows: (a) For Reg-Up, if applicable: RUINFQAMT q = MCPCRU DAM * RUINFQ q (b) For Reg-Down, if applicable: RDINFQAMT q = MCPCRD DAM * RDINFQ q (c) For RRS, if applicable: RRINFQAMT q = MCPCRR DAM * RRINFQ q (d) For Non-Spin, if applicable: NSINFQAMT q = MCPCNS DAM * NSINFQ q Settlement calculation revisions: Adjustments to Section 6.7.4, Adjustments to Cost Allocations for Ancillary Services Procurement, have been made for the following: ********* Include the total infeasible quantity cost (RUINFQAMTTOT, RDINFQAMTTOT, RRINFQAMTTOT, NSINFQAMTTOT) in the calculation of the total cost for procuring each AS type (RUCOSTTOT, RDCOSTTOT, RRCOSTTOT, NSCOSTTOT) ********* Remove the replacement capacity (RURP, RDRP, RRRP, NSRP) from the calculation of the QSE's obligation amount (RUO, RDO, RRO, NSO) 6.7.4 Adjustments to Cost Allocations for Ancillary Services Procurement (1) Each QSE, for which ERCOT purchases Ancillary Service capacity in the DAM, a SASM, or an RSASM, is charged for the QSE's share of the net costs incurred for each service. (2) For Reg-Up, if applicable: (a) The net total costs for Reg-Up for a given Operating Hour is calculated as follows: RUCOSTTOT = (-1) * ((RTPCRUAMTTOT m) + PCRUAMTTOT + RUFQAMTTOT + RUINFQAMTTOT) Where: Total charge of infeasible Ancillary Service Supply Responsibility for Reg-Up: RUINFQAMTTOT = RUINFQAMT q (b) Each QSE's share of the net total costs for Reg-Up for the Operating Hour is calculated as follows: RUCOST q = RUPR * RUQ q Where: RUPR = RUCOSTTOT / RUQTOT RUQTOT = RUQ q RUQ q = RUO q - SARUQ q RUO q = (SARUQ q + (RTPCRU q, m) + PCRU q - RUFQ q - RRUFQ q) * HLRS q SARUQ q = DASARUQ q + RTSARUQ q (3) For Reg-Down, if applicable: (a) The net total costs for Reg-Down for a given Operating Hour is calculated as follows: RDCOSTTOT = (-1) * ((RTPCRDAMTTOT m) + PCRDAMTTOT + RDFQAMTTOT + RDINFQAMTTOT) Where: Total charge of infeasible Ancillary Service Supply Responsibility for Reg-Down: RDINFQAMTTOT = RDINFQAMT q (b) Each QSE's share of the net total costs for Reg-Down for the Operating Hour is calculated as follows: RDCOST q = RDPR * RDQ q Where: RDPR = RDCOSTTOT / RDQTOT RDQTOT = RDQ q RDQ q = RDO q - SARDQ q RDO q = (SARDQ q + (RTPCRD q, m) + PCRD q - RDFQ q - RRDFQ q) * HLRS q SARDQ q = DASARDQ q + RTSARDQ q (4) For RRS, if applicable: (a) The net total costs for RRS for a given Operating Hour is calculated as follows: RRCOSTTOT = (-1) * ((RTPCRRAMTTOT m) + PCRRAMTTOT + RRFQAMTTOT + RRINFQAMTTOT) Where: Total charge of infeasible Ancillary Service Supply Responsibility for RRS: RRINFQAMTTOT = RRINFQAMT q (b) Each QSE's share of the net total costs for RRS for the Operating Hour is calculated as follows: RRCOST q = RRPR * RRQ q Where: RRPR = RRCOSTTOT / RRQTOT RRQTOT = RRQ q RRQ q = RRO q - SARRQ q RRO q = (SARRQq + (RTPCRR q, m) + PCRR q - RRFQ q - RRRFQ q) * HLRS q SARRQ q = DASARRQ q + RTSARRQ q (5) For Non-Spin, if applicable: (a) The net total costs for Non-Spin for a given Operating Hour is calculated as follows: NSCOSTTOT = (-1) * ((RTPCNSAMTTOT m) + PCNSAMTTOT + NSFQAMTTOT + NSINFQAMTTOT) Where: Total charge of infeasible Ancillary Service Supply Responsibility for Non-Spin: NSINFQAMTTOT = NSINFQAMT q (b) Each QSE's share of the net total costs for Non-Spin for the Operating Hour is calculated as follows: NSCOST q = NSPR * NSQ q Where: NSPR = NSCOSTTOT / NSQTOT NSQTOT = NSQ q NSQ q = NSO q - SANSQ q NSO q = (SANSQ q + (RTPCNS q, m) + PCNS q - NSFQ q - RNSFQ q) * HLRS q SANSQ q = DASANSQ q + RTSANSQ q New Settlement Bill Determinants: Bill Determinant Short Description Extract Extract Table RUINFQ q Reg-Up Infeasible Quantity per QSE RTM CODE MKTINPUTHEADER MKTINPUTINTERVAL RUINFQAMT q Reg-Up Infeasible Quantity Amount per QSE RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL RUINFQAMTTOT Reg-Up Infeasible Quantity Amount Total RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL RDINFQ q Reg-Down Infeasible Quantity per QSE RTM CODE MKTINPUTHEADER MKTINPUTINTERVAL RDINFQAMT q Reg-Down Infeasible Quantity Amount per QSE RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL RDINFQAMTTOT Reg-Down Infeasible Quantity Amount Total RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL RRINFQ q Responsive Reserve Service Infeasible Quantity per QSE RTM CODE MKTINPUTHEADER MKTINPUTINTERVAL RRINFQAMT q Responsive Reserve Service Infeasible Quantity Amount per QSE RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL RRINFQAMTTOT Responsive Reserve Service Infeasible Quantity Amount Total RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL NSINFQ q Non-Spin Infeasible Quantity per QSE RTM CODE MKTINPUTHEADER MKTINPUTINTERVAL NSINFQAMT q Non-Spin Infeasible Quantity Amount per QSE RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL NSINFQAMTTOT Non-Spin Infeasible Quantity Amount Total RTM CODE RTMOUTPUTHEADER RTMOUTPUTINTERVAL ACTION REQUIRED: Implement changes to shadow Settlement systems for NPRR782. 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