rmsupdate january 6, 2005 retail market subcommittee update to tac

RMS RMS UpdateUpdateRMS RMS

UpdateUpdate

January 6, 2005

Retail Market SubcommitteeUpdate to TAC


UpdateUpdate

Voting Items

Annual Validation Report to the ERCOT Board (Revised)

RMGRR 017 – Transaction Timing Matrix

RMGRR 016 – Oncor Name Change to TXU Electric

Delivery

Non-Voting Items

Load Research Sampling (LRS) Project Update

Agenda


UpdateUpdate

Annual Validation Report to the ERCOT Board (Revised) Do not replace a prior year non-default assignment with a default

assignment Apply dead-bands around the specified Residential Segment trigger point Apply a kWh minimum for Residential High Winter Ratio profile assignment Review use of more stable Residential Winter Ratio formula.

RMGRR 017 – Transaction Timing Matrix TITF initiative Capture the modifications to Chapter 15 Minor editorial changes

RMGRR 016 – Oncor Name Change to TXU Electric Delivery Name change only All sections affected

Voting Items


UpdateUpdate

Load Research Sampling (LRS)

Project Summary

As presented by ERCOT for RMS Meeting – 12/16/2004


UpdateUpdate LRS Project Summary -- Project• Background

– Purpose: To collect load research data to support ERCOT’s load profiling efforts. The LRS data will be used to improve profiles and increase the accuracy of settlements.

– ERCOT’s responsibility – to select the load research samples and make the Load Profile data available to market participants.

– Sample locations were selected to distributed among each of 6 profile types and 8 weather zones.

• Profile Types = Residential Low Winter Ratio, Residential High Winter Ratio, Business No Demand, Business Low Load Factor, Business Medium Load Factor, Business High Load Factor

• Weather Zones = Coast, East, West, Far West, North, North Central, South, South Central

– TDSPs responsibility – to install IDR meters for data collection; performing VEE on collected data; and transferring data to ERCOT


UpdateUpdate

5 TDSPsMV90

CRCR

CRCR

ERCOT

IDRIDR IDR

IDR

NAESB EDM v1.6

HTTPS (FTP Replacement)

CRCR

CRCR

CRCR

CRCR

CRCR

CRCR

IDRIDR IDR

IDRIDR

IDR IDRIDR

LRS Data Flow

NOT USING EDI TRANSACTIONS


UpdateUpdate LRS Project Summary -- Project• Project Measurement and Metrics

– Timeline• Project start date – May 2003• Project Deployment date – November 2004

– ERCOT Budget• Original Project Budget -- $1.5M • Actual charges to date -- $700k (Not including TDSP expense)

– (5) TDSPs Commitment• All TDSPs completed Pilot testing• Installed over 4200 IDR sample points• Sample point readings have been transmitted to ERCOT starting in

August 2004

– (13) CRs Commitment• All CRs have completed Pilot testing• ERCOT is in the process of building systems to transmit data to CRs


UpdateUpdate LRS Project Summary • Market Summary

– TDSP Installation update as of 12/1/2004

– Ongoing ERCOT Responsibility• Verify sample point installation and transaction confirmation underway• Work with TDSPs on remaining installations and replacements (on-going)• Transition to O&M role for sample point management and tracking• Provide data to Market Participants as required

Company Installed

AEP North 366

AEP Central 581

Centerpoint 423

TXU Electric Delivery 2765

TNMP 105

Sharyland 1

Total 4241

Complete to Date 96.56%


UpdateUpdate

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Questions

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UpdateUpdateVoting ItemsPWG Action Plans

1. Do not replace a prior year non-default

assignment with a default assignment

A new calculation for each ESI ID is made each year

Currently: Insufficient data requires assignment to default

Residential defaults to Residential Low Winter Ratio (RESLOWR)

Commercial defaults to Business Medium Load Factor (BUSMEDLF)

Proposed: If sufficient data was available in a previous year an

assignment to default would not be made



2. Applying dead-bands around the specified

Residential Segment trigger point

Currently: If WR > 1.5 it is assigned to High Winter Ratio (HiWR)

Proposed: Create a dead-band around the 1.5 trigger point

Example – Assume dead-band (1.0 to 2.0)

if current assignment is RESLOWR and new WR = 1.7, would remain RESLOWR

if current assignment is RESLOWR and new WR = 2.1, would change to RESHIWR

Result - significant reduction in migration

SpringBaseFallBaseAverage

ADUseADUseADUseMaxWR febjandec

,

,,



3. Use more than 1 month for the

Residential Winter Ratio formula

Example – Change numerator to average the ADU for

highest 2 months

Result - significant reduction in migration

SpringBaseFallBaseAverage

ADUseADUseADUseMaxWR febjandec

,

,,



4. Apply a kWh minimum for Residential

High Winter Ratio profile assignment

Currently: None

Proposed: Identify a reasonable minimum usage for High

Winter Ratio assignment

Example – RESHIWR minimum = 10 kWh/day (300kWH/month)

If WR = 3.0 and 5 kWh/day then assign RESLOWR

If WR = 3.0 and 15 kWh/day then assign RESHIWR



5. Use an ERCOT administered residential survey

to determine heating system type for a sample

of customers

The survey will empirically support data used to define dead-

bands, minimum thresholds and revised WR calculation

40,000 surveys will be mailed to end use customers

5,000 to each weather zone

2,500 to each existing profile type current assignment

rmsupdate january 6, 2005 retail market subcommittee update to tac

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