Agenda - Tuesday

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Texas Nodal

Texas Nodal Market Management System

Requirement Documents

November 7, 2006

Sai Moorty

MMS Project Engineer


Texas Nodal

Agenda - Tuesday

Introduction

MMS Requirements Documents

Upcoming White Papers

MMS Requirements Approval Plan

ERCOT contacts


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Introduction

ERCOT and Vendor (ABB) Team started work together in July 2006.

Sub teams formed for preparing requirements documents on the following major functional areas

Day-Ahead Market (DAM) and Supplementary Ancillary Service Market (SASM)

Reliability Unit Commitment (RUC)

Security Constrained Economic Dispatch (SCED)

Constraint Competitiveness Test (CCT)

Other Processes

Market Management System (MMS) Requirements Documents have been written with reference to the May 2006 version of the Texas Nodal Protocols.

Informal review (October 2006) by some Market Participants of DAM/SASM, RUC and SCED requirements documents.


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Introduction

Where we are today

Market Management System (MMS) Requirement Documents submitted for TPTF

review and approval as compliant to the Texas Nodal Protocols of May 2006


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Introduction

List of MMS Requirements Documents:

Texas Nodal Market Management Systems (MMS) Requirement Specification For Overall MMS System and Other Processes

Texas Nodal Market Management Systems (MMS) Requirement Specification For Day-Ahead Market (DAM) and Supplemental Ancillary Service Market (SASM)

Texas Nodal Market Management Systems (MMS) Requirement Specification For RUC

Texas Nodal Market Management Systems (MMS) Requirement Specification For SCED and Real-Time MMS Processes

Texas Nodal Market Management Systems (MMS) Requirement Specification For Constraint Competitiveness Test (CCT)


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Texas Nodal Market Management Systems (MMS) Requirement Specification For Overall MMS System and Other Processes

Topics covered

Overview of MMS System

System Requirements, AS Deployment for Load Resources, DC Tie processes, COP monitoring/validation.

Operator Alerts, QSE Notification and MIS posting


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Texas Nodal Market Management Systems (MMS) Requirement Specification For Day-Ahead Market (DAM) and Supplemental Ancillary Service Market (SASM)

Topics covered

Overview of DAM and SASM subsystems

Inputs and Outputs of the DAM and SASM subsystems

Processing of Market Participants submissions

DAM Processes (Credit check, AS insufficiency check, Oversold CRR determination, CRR Option derating, DAM Clearing)

AS evaluation in Adjustment Period

SASM Process

Mathematical Formulation presented in Appendix


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Texas Nodal Market Management Systems (MMS) Requirement Specification For RUC

Topics covered

Overview of RUC subsystem

Inputs and Outputs of RUC

RUC modes (DRUC, HRUC, WRUC)

RUC Input processing

RUC Operator Controls

RUC processes

Mathematical formulation presented in Appendix


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Texas Nodal Market Management Systems (MMS) Requirement Specification For SCED and Real-Time MMS Processes

Topics covered

Overview of Adjustment Period and Real-Time Operations related to MMS

Inputs and Outputs of SCED

SCED Input processing

SCED Process and Settlement Point Price Calculation

Mathematical formulation presented in Appendix


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Texas Nodal Market Management Systems (MMS) Requirement Specification For Constraint Competitiveness Test (CCT)

Topics covered

Overview of CCT (Annual, Monthly, Daily)

Inputs and Outputs of CCT

CCT Processes


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Requirement Analysis of Real-Time Operations related to Load Frequency Control (LFC) and its interaction with Security Constrained Economic Dispatch (SCED) has raised issues.

Subsequent discussions between ERCOT, Vendors (AREVA and ABB) and Floyd Trefny (Consultant) resulted in decision to submit White Papers to TPTF for review.

The topics covered in the white papers primarily impacts the EMS Generation Subsystem. The main topics of the White Papers are listed below:

Responsive Reserve deployment and recall

Non-Spinning Reserve deployment and recall

Handling of inconsistent High Dispatch Limit (HDL) and Low Dispatch Limit (LDL)

Ramping of Base Points through telemetered desired generation

Resource Ancillary Service telemetry requirements


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Potential impact of White Papers on MMS conceptual design are in the following areas:

Requirements related to use of Resource Ancillary Service telemetry

Responsive Reserve deployment and recallSCED Ramp Rate CalculationSCED Generation Requirement

Important: While these whitepapers may affect MMS conceptual design, they do not affect the submitted MMS requirements documents or this review process.

Planned next steps

November 17, 2006: Planned submission of White Papers to TPTF

November 27, 2006: TPTF comments on White Papers due to ERCOT

November 28-30, 2006: Discussion on White Papers


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MMS Requirements Approval Plan

1. November 16, 2006: TPTF comments due to ERCOT

ERCOT would encourage comments to be submitted when ready

MMS team (ERCOT and Vendors) will be available for clarification

2. November 28, 2006: ERCOT presents status update on and possible discussion of TPTF comments.

3. December 1, 2006*: ERCOT submits updated MMS Requirements Documents and response to TPTF comments.

4. December 4, 2006*: TPTF approves MMS Requirements Documents

*These items are target dates, and will be greatly dependent on the quantity of comments and magnitude of changes required.


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ERCOT Contacts

Sai MoortyMMS Project [email protected](512) 431-9648

Brandon WhittleLead, Real Time Market [email protected](512) 248-6588

Bill [email protected](512) 248-6663


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Questions & Answers

Agenda - Tuesday

Documents

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