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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.

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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