1DRAFT for DISCUSSION Transition From Non-IDR to IDR Load Profile and LSE 15-minute Data for AMS Market Advanced Readings and Settlements Taskforce 10/9/09 Conference Call

2DRAFT for DISCUSSION TDSP Assumptions for LSE Data Transition REPs will continue to get interval data the day after VEE’d data will change very little beyond 6 days after an operating day 6 day time lag is due to transactions lifecycle for load profile changes LSE data for Provisioned AMS meters is intended be available for Initial Settlement ERCOT will be able to process 1 million ESIIDs through the Interim Settlement process by Monday November 16 LSE data for an ESIID that does not have “AMS” identifying profile code will be rejected Rejection is automated for LSE data and thus will cause no operational problems by TDSPs or ERCOT regardless of volumes TDSPS intend provide missed LSE data to ERCOT by current protocol requirements Processes for identifying gaps in ERCOT loaded LSE data are sufficient as defined in the Interim Settlement Project to manage backfilling missing interval data

3DRAFT for DISCUSSION Transactional Processing 867_03 Monthly Usage (non-IDR Profile) – Prior month’s non-IDR usage and DRG must be successfully processed and loaded at ERCOT before any changes can be made to the Load Profile assignment This process usually completes in 3 days – allowing time for: – Meter reading to be processed and non-IDR 867_03 transaction to be created by TDSP – ERCOT to receive 867_03 non IDR transaction and process readings (usage/DRG) – TDSP to verify if ERCOT successfully processed and loaded non-IDR readings. 814_20 Create/Maintain/Retire ESI ID Request – 814_20 change for Load Profile changes can only be completed in conjunction with a cycle reading, This process usually completes in 1 Day, however there are system limitations at ERCOT on how many 814_20s can be processed requiring an 814_20 coordination effort between ERCOT and all TDSPs, similar to ERCOT and TDSPs process for Residential Annual Validation. New Load Profiles changes for AMS will not be accepted at ERCOT if Load Profile Change eligibility dates are before ERCOT’s production implementation of the Interim Settlement Solution – Project

4DRAFT for DISCUSSION Transactional and LSE Processing- Oncor ERCOT AMS Production Conversio n weekend Saturday 11/14 Monday 11/16 Sunday 11/15 Wed. 11/18 Friday 11/20 Saturday 11/21 867_03 EDI at ERCOT 814_20 Profile Change 4 days after Operating day LSE Files released to ERCOT LSE data to ERCOT w/ 6 day lag Thursday 11/19 Tuesday 11/17 Sunday 11/22 Oncor will send the LSE data 6 days after an Operating day for all AMS meters it considers provisioned during Transition and On-going 1 st Cycle day for AMS era Meter reads for Monday processe d Load Profile Complet e LSE data to REPs next day w/ daily changes

5DRAFT for DISCUSSION LSE Data Timeline – On-going Oncor Only ERCOT View LSE data to REPs next day w/ daily changes if needed REP View Op Day LSE data to ERCOT daily with 6 day delay

6DRAFT for DISCUSSION Transactional and LSE Processing - CNP Monday 11/16 Wednesday 11/18 Tuesday 11/17 Friday 11/20 Sunday. 11/22 Monday 11/23 867_03 EDI sent Ad Hoc Usage request for 15 minute Settlement Quality Data for 11/16/2009 through 11/21/2009 will be sent to ERCOT Saturday 11/21 Thursday 11/19 As an ESI ID is transitioned to the IDR Load Profile CenterPoint Energy will send LSE data to ERCOT 6 days after the IDR Load Profile effective date. CenterPoint will make an Ad hoc usage data request to their MDM to populate the missing interval data during transition. Once the ESI ID has been transitioned to the IDR Load Profile CenterPoint will send the LSE data the day after an operating day Monthly Meter Reading Meter read processed by TDSP 814_20 Profile Change 4 days after Operating day. First LSE files to ERCOT Load Profile Complete LSE for 11/22 sent to ERCOT Ad Hoc Usage request for 15 minute Settlement Quality Data for 11/16/2009 through 11/21/2009 will be sent to ERCOT

7DRAFT for DISCUSSION