NOTICE DATE: October 20, 2017
NOTICE TYPE: M-D092917-03 NPRR
SHORT DESCRIPTION: Implementation Details for NPRR782 and NPRR840
INTENDED AUDIENCE: ERCOT Market Participants and Settlement Personnel
DAYS AFFECTED: November 1, 2017
LONG DESCRIPTION: ERCOT will be implementing changes for Nodal Protocol Revision Request (NPRR) 782, Settlement of Infeasible Ancillary Services Due to Transmission Constraints, and NPRR840, Implementation
of Infeasible Ancillary Service Protocol Revisions, on November 1, 2017.
NPRR840 revises the definitions to remove the Resource level attribute from the Ancillary Service infeasible quantity bill determinants (RUINFQ, RDINFQ, RRINFQ and NSINFQ).
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 |
PRDE
RTM CODE |
BILLDETERMINANT
MKTINPUTHEADER MKTINPUTINTERVAL |
RUINFQAMT q |
Reg-Up Infeasible Quantity Amount per QSE |
PRDE
RTM CODE |
BILLDETERMINANT
RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
RUINFQAMTTOT |
Reg-Up Infeasible Quantity Amount Total
|
PRDE
RTM MODE |
BILLDETERMINANT
RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
RDINFQ q |
Reg-Down Infeasible Quantity per QSE |
PRDE
RTM CODE |
BILLDETERMINANT MKTINPUTHEADER MKTINPUTINTERVAL |
RDINFQAMT q |
Reg-Down Infeasible Quantity Amount per QSE |
PRDE
RTM CODE |
BILLDETERMINANT RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
RDINFQAMTTOT |
Reg-Down Infeasible Quantity Amount Total
|
PRDE
RTM MODE |
BILLDETERMINANT RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
RRINFQ q |
Responsive Reserve Service Infeasible Quantity per QSE |
PRDE
RTM CODE |
BILLDETERMINANT MKTINPUTHEADER MKTINPUTINTERVAL |
RRINFQAMT q |
Responsive Reserve Service Infeasible Quantity Amount per QSE |
PRDE
RTM CODE |
BILLDETERMINANT RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
RRINFQAMTTOT |
Responsive Reserve Service Infeasible Quantity Amount Total
|
PRDE
RTM MODE |
BILLDETERMINANT RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
NSINFQ q |
Non-Spin Infeasible Quantity per QSE |
PRDE
RTM CODE |
BILLDETERMINANT MKTINPUTHEADER MKTINPUTINTERVAL |
NSINFQAMT q |
Non-Spin Infeasible Quantity Amount per QSE |
PRDE
RTM CODE |
BILLDETERMINANT RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
NSINFQAMTTOT |
Non-Spin Infeasible Quantity Amount Total
|
PRDE
RTM MODE |
BILLDETERMINANT RTMOUTPUTHEADER RTMOUTPUTINTERVAL |
ACTION REQUIRED: Implement changes to shadow Settlement systems for NPRR782.
ADDITIONAL INFORMATION: Pursuant to Nodal Protocol Section 21.6, Nodal Protocol Revision Implementation, ERCOT is required to provide notice as soon as practicable, but no later than ten days prior to
implementation.
NPRR782 and
NPRR840 and associated documents can be found on the ERCOT website.
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].
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