Issues

NPRR064

Title	Modeling of Generic Transmission Constraints
Next Group
Next Step
Status	Approved on 07/17/2007
Effective Dates	12/01/2010 or per the Nodal Protocol Transition Plan http://www.ercot.com/mktrules/protocols (08/01/07 Nodal Protocols Library)

Date	Gov Body	Action Taken	Next Steps
07/17/2007	BOARD	Approved
06/28/2007	TAC	Recommended for Approval	Board consideration of this NPRR and its IA
06/21/2007	PRS	Recommended for Approval	TAC consideration of this NPRR and its Impact Analysis

Date

Gov Body

Action Taken

Next Steps

07/17/2007

BOARD

Approved

06/28/2007

TAC

Recommended for Approval

Board consideration of this NPRR and its IA

06/21/2007

PRS

Recommended for Approval

TAC consideration of this NPRR and its Impact Analysis

Date	Gov Body	Motion	Result
07/17/2007	BOARD	To approve this NPRR as recommended by TAC.	Passed
06/28/2007	TAC	To recommend approval of this NPRR and its IA as recommended by PRS.	Passed
06/21/2007	PRS	To recommend approval of NPRR064 as amended by PRS, endorse the IA and forward documents to TAC	Passed

Date

Gov Body

Motion

Result

07/17/2007

To approve this NPRR as recommended by TAC.

Passed

06/28/2007

To recommend approval of this NPRR and its IA as recommended by PRS.

Passed

06/21/2007

To recommend approval of NPRR064 as amended by PRS, endorse the IA and forward documents to TAC

Passed

Status:	Approved
Date Posted:	May 29, 2007
Sponsor:	Trip Doggett on behalf of TPTF
Urgent:	No
Sections:	2.1, 2.2, 3.10, 3.10.7.5
Description:	This Nodal Protocol Revision Request (NPRR) provides for the definition of and posting of Generic Transmission Limits (GTLs) in Network Operations Modeling requirements.
Reason:	Although the Nodal Protocol descriptions of Network Security Analysis and Congestion Revenue Rights (CRR) Auctions reference the use of "generic" transmission constraints, Section 3.10, Network Operations Modeling and Telemetry does not provide for their definition and for limits on their use. Generic constraints are typically more limiting than a Transmission Element’s thermal limit and can have significant impact on Locational Marginal Prices (LMPs) when they constrain a solution. This NPRR provides for the modeling of these constraints and provides notice to the Market Participants through postings to the MIS.