Issues

NPRR285

Summary
Action
Voting Record
Background
Key Documents

Summary

Title	Generation Resource Base Point Deviation Charge Corrections
Next Group
Next Step
Status	Approved on 11/16/2010
Effective Dates	05/18/2011 Sections 6.5.5.2, 6.5.7.4(d), and 6.5.7.9 06/01/2011 Sections 6.6.5.1, 6.6.5.1.1, 6.6.5.1.2, and 6.6.5.2

Action

Date	Gov Body	Action Taken	Next Steps
11/16/2010	BOARD	Approved
11/04/2010	TAC	Recommended for Approval	ERCOT Board consideration of NPRR285
10/21/2010	PRS	Recommended for Approval	TAC consideration of NPRR285

Date

Gov Body

Action Taken

Next Steps

11/16/2010

BOARD

Approved

11/04/2010

TAC

Recommended for Approval

ERCOT Board consideration of NPRR285

10/21/2010

PRS

Recommended for Approval

TAC consideration of NPRR285

Voting Record

Date	Gov Body	Motion	Result
11/16/2010	BOARD	To approve NPRR285 as recommended by TAC in the 11/4/10 TAC Report.	Passed
11/04/2010	TAC	To recommend approval of NPRR285 as amended by the 10/28/10 STEC comments and as revised by TAC.	Passed
10/21/2010	PRS	To recommend approval of NPRR285 as amended by the 10/20/10 WMS comments and as revised by PRS, to assign a priority of Critical to the grey-boxed language, and to forward NPRR285 to TAC.	Passed

Date

Gov Body

Motion

Result

11/16/2010

BOARD

To approve NPRR285 as recommended by TAC in the 11/4/10 TAC Report.

Passed

11/04/2010

TAC

To recommend approval of NPRR285 as amended by the 10/28/10 STEC comments and as revised by TAC.

Passed

10/21/2010

PRS

To recommend approval of NPRR285 as amended by the 10/20/10 WMS comments and as revised by PRS, to assign a priority of Critical to the grey-boxed language, and to forward NPRR285 to TAC.

Passed

Background

Status:	Approved
Date Posted:	Oct 12, 2010
Sponsor:	WMS
Urgent:	No
Sections:	6.5.5.2, 6.5.7.4, 6.5.7.9, 6.6.5.1, 6.6.5.1.1, 6.6.5.1.2, 6.6.5.2
Description:	This Nodal Protocol Revision Request (NPRR) provides that an exception to the Generation Resource Base Point Deviation Charge for any 15-minute Settlement Interval which includes a Security-Constrained Economic Dispatch (SCED) interval that is less than four minutes in duration. Additional changes are proposed to Base Point Deviation Charges for over- and under-generation, to be effective upon system implementation. This NPRR also removes the Base Point Deviation Charge for all Intermittent Renewable Resources (IRRs) until corrections to the Nodal systems can be implemented so that the charge applies to IRRs only when there is clear indication that the Base Point received needs to be followed. A flag will be sent by ERCOT to the Qualified Scheduling Entity (QSE) for each Resource indicating SCED has Dispatched a Generation Resource below the High Dispatch Limit (HDL) used by SCED. This flag will be used by the Settlement system to determine when the IRR Generation Resource Base Point Deviation Charge will apply. In addition, the calculations are changed to apply the charge whether the Settlement Point Price is negative or positive.
Reason:	The implementation of the TWTG in the current Nodal software does not account for SCED cycles that are less than five minutes, In addition, it does not provide a clear signal to IRRs to indicate when they must curtail due to system constraints. A workaround has been put in place that requires each IRR to interpret the ERCOT Dispatch signals and its own telemetry to determine when curtailment is necessary. The changes in this NPRR provide a clear curtailment signal to the IRR and eliminate a time delay in information imposed because of the workaround. In addition, this NPRR corrects a Settlement equation error that was in the Nodal Protocols. Until the software is changed, the Base Point Deviation Charge is not calculated for IRRs. If the incorrect calculation were to remain in place then each IRR would receive incorrect Base Point Deviation Charges each billing cycle. ERCOT would be inundated with disputes. WMS submits this revision in its initial conceptual form to expedite Market Participant and ERCOT commenting. WMS will endorse the final NPRR language as soon as possible with the goal to have the NPRR in place in prior to the Texas Nodal Market Implementation Date (TNMID).