Issues

NPRR119

Summary
Action
Voting Record
Background
Key Documents

Summary

Title	Resource Limit Calculator
Next Group
Next Step
Status	Approved on 07/15/2008
Effective Dates	12/01/2010 or per the Nodal Protocol Transition Plan http://www.ercot.com/mktrules/protocols (08/01/08 Nodal Protocols Library)

Action

Date	Gov Body	Action Taken	Next steps
06/26/2008	TAC	Recommended for Approval	ERCOT Board consideration
06/19/2008	PRS	Recommended for Approval	Consideration of NPRR119 by TAC
07/15/2008	BOARD	Approved
05/22/2008	PRS	Recommended for Approval	Review of Impact Analysis and Recommendation Report.
04/18/2008	PRS	Referred	Review by the TPTF.

Date

Gov Body

Action Taken

Next steps

06/26/2008

TAC

Recommended for Approval

ERCOT Board consideration

06/19/2008

PRS

Recommended for Approval

Consideration of NPRR119 by TAC

07/15/2008

BOARD

Approved

05/22/2008

PRS

Recommended for Approval

Review of Impact Analysis and Recommendation Report.

04/18/2008

PRS

Referred

Review by the TPTF.

Voting Record

Date	Gov Body	Motion	Result
06/26/2008	TAC	To recommend approval of NPRR119 as recommended by PRS.	Passed
06/19/2008	PRS	To endorse the Impact Analysis and Recommendation Report for NPRR119, and forward the documents to TAC.	Passed
07/15/2008	BOARD	To approve NPRR119 as recommended by TAC.	Passed
05/22/2008	PRS	To recommend approval of NPRR119 as submitted.	Passed
04/18/2008	PRS	To refer NPRR119 to TPTF.	Passed

Date

Gov Body

Motion

Result

06/26/2008

TAC

To recommend approval of NPRR119 as recommended by PRS.

Passed

06/19/2008

PRS

To endorse the Impact Analysis and Recommendation Report for NPRR119, and forward the documents to TAC.

Passed

07/15/2008

BOARD

To approve NPRR119 as recommended by TAC.

Passed

05/22/2008

PRS

To recommend approval of NPRR119 as submitted.

Passed

04/18/2008

PRS

To refer NPRR119 to TPTF.

Passed

Background

Status:	Approved
Date Posted:	Mar 27, 2008
Sponsor:	ERCOT Staff
Urgent:	No
Sections:	6.5.7.2, Resource Limit Calculator
Description:	This Nodal Protocol Revision Request (NPRR) changes the Low Dispatch Limit (LDL) calculation to ensure that the LDL and High Dispatch Limit (HDL) limit sent to the Security Constrained Economic Dispatch (SCED) do not exceed the High Sustained Limit (HSL) under any circumstance.
Reason:	When the output MW of a Resource exceeds its telemetered HSL for a short time (e.g. governor response) SCED will attempt to dispatch the Resource above its HSL. Modifying the LDL calculation with a final check will ensure that the LDL and HDL limits calculated by the Resource Limit Calculator (RLC) and sent to SCED do not exceed the HSL under any circumstance.