Title Ancillary Service Deployment Clarification
Next Group
Next Step
Status Approved on 10/20/2009
Effective Dates

or per the Nodal Protocol Transition Plan http://www.ercot.com/mktrules/protocols (11/01/09 Nodal Protocols Library)


Date Gov Body Action Taken Next steps
09/17/2009 PRS Recommended for Approval TAC consideration of NPRR189
08/25/2009 PRS Recommended for Approval PRS Impact Analysis review
10/20/2009 BOARD Approved
10/01/2009 TAC Recommended for Approval ERCOT Board consideration of NPRR189.

Voting Record

Date Gov Body Motion Result
09/17/2009 PRS To endorse and forward the 8/25/09 PRS Recommendation Report, as amended by the 9/17/09 ERCOT comments, and Impact Analysis for NPRR189 to TAC. Passed
08/25/2009 PRS To recommend approval of NPRR189 as submitted. Passed
10/20/2009 BOARD To approve NPRR189 as recommended by TAC in the 10/1/09 TAC Recommendation Report. Passed
10/01/2009 TAC To recommend approval of NPRR189 as recommended by PRS in the 9/17/09 PRS Recommendation Report. Passed


Status: Approved
Date Posted: Jul 24, 2009
Sponsor: ERCOT
Urgent: No
Description: This Nodal Protocol Revision Request (NPRR) clarifies the difference between Ancillary Service capacity deployment and energy deployment and how it affects Security-Constrained Economic Dispatch (SCED). This NPRR also proposes non-substantive administrative changes, such as correcting acronym and defined term usage and section references.
Reason: This NPRR is needed to provide more clarity and make the Nodal Protocols consistent with Energy Management System (EMS)/Market Management System (MMS) whitepaper and current MMS implementation.

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