1. 1 ESI ID SERVICE HISTORY AND USAGE DATA EXTRACT SYSTEM CHANGE REQUEST (SCR 727) February 24, 2003

2. 2 Purpose of the Extract 1.Provide data transparency to TDSPs and LSEs for ESI ID level data that ERCOT utilizes in market settlement. –Allows Market Participants to compare ERCOT data to their internal source system data –Market Participant can identify data variances and raise issues to the appropriate party for resolution 2.Provide Market Participants with the ability to develop shadow settlement systems. –Should reduce settlement disputes since data variances should be reconciled prior to True-up settlement –Allows entities to close-the books after True-up settlement

3. 3 What is a Service History Extract? Data record rows which contain the characteristics associated with a given ESI ID for a specific time period that is used by ERCOT for data aggregation and settlement purposes –Record Start Time –Record Stop Time –LSE Code (Retailer, CR, AREP, NOIE) –TDSP Service Area Code –MRE Code –Profile Id –Station Code –Distribution Loss Factor Code –Region Code –ESI ID Status –& data elements associated to ESI IDs registered as Load Resources Note: See the Data Definition Language (DDL) document for specific naming convention and data elements

4. 4 What is a Usage Extract? Data record rows which contain usage data that has been submitted by the TDSP/MRE for each ESI ID and has successfully passed validation loaded into ERCOT’s Lodestar system –CR will receive all records where they were REP of Record for time period associated to the usage record –TDSP will receive all records where they were TDSP of Record for time period associated to the usage record –Interval Data Recorders (IDR): record rows include each interval between the start and stop times of the meter read with a separate data row for each trade day included in the 867_03 –Non-Interval Data Records (Non-IDR): Non-Demand: Record rows containing the energy consumption value between the start and stop dates of the meter read Demand: The above record rows plus record rows containing a single demand value established between the start dates and stop dates of the meter read

5. 5 ESIID Existence, Entity Relationships & Settlement Characteristics Station to UFE and CM Zone Mapping Entity Name and Duns Interval Data Records Non-Interval Usage Records ESI ID Extract Database Structure ESIID SERVICE HISTORY LSCHANNELCUT DATA LSCHANNELCUT HEADER LSCHANNELCUT STATUS STATION SERVHIST CMZONE TDSP REP MRE PGC ESIIDUSAGE ESIID Identifies Manual Data Corrections ESIIDSERVICEHIST_Delete LSCHANNELCUTHEADER_Delete ESIID_Delete ESIIDUSAGE_Delete

6. 6 Initial Historical Data Extracts Data record row files will be created for each TDSP, LSE (and MRE where they are different for the TDSP or LSE) for all ESI ID Service History record rows where they are identified as the TDSP, LSE, or MRE. Usage history provided beginning with any record that crosses 7/31/2001. Associated tables and incremental updates to support the ESI ID Service History records –TDSP, REP, MRE, PGC, Station Service History and CM Zone tables

7. 7 Daily Incremental Update Extracts Capture updates/changes that were loaded to ERCOT’s Lodestar system for the previous day’s processing and which were subsequently captured in the Data Archive. –Example: Monday’s updates/changes to Lodestar that are captured in Data Archive on Tuesday morning, will be posted to the ERCOT Portal on Wednesday. Daily incremental extracts will be posted by 9:00 a.m. each day, seven days a week WednesdayTuesdayMonday Changes & Updates to Lodestar Changes Captured In Data Archive For Monday Extracts Produced for Monday

8. 8 Data Extract Delivery Historical ESI ID Service History and Usage Data Extract –ERCOT Portal (Reports Explorer/Market Participant folder) Requires MP to have Digital Certificate –CD(s) (overnight delivery) Incremental daily update extracts –ERCOT Portal (Reports Explorer/Market Participant folder) Requires MP to have Digital Certificate ERCOT retains 30-days of history on the Portal

9. 9 Market Participant’s Responsibilities Receive Data Definition Language (DDL) –Create relational database for extract data Create “comparison tool” –Reconcile data extract information with internal system records Download historical data extract and sequential daily incremental update extracts Identify variances and report per defined mechanisms –TDSPs and CRs Submit data extract variances via FasTrak (http://fastrak.ercot.com)http://fastrak.ercot.com –No less than 30 days prior to scheduled resettlement date Two types of variances for ERCOT resolution: –ESI ID Service History data extract variances –ESI ID usage data extract variances Non-ERCOT (CR/TDSP) data extract variances: –ESI ID attributes (profile ID, loss factor code, station assignment, etc.) –Non-Opt In Entities (NOIEs) Submit data extract variances via “Create Service Request” – ERCOT Portal

10. 10 ERCOT DDL MP to ERCOT 1 Initial & Daily Extracts 4 Market Participants DDL MP 727 Db Existing Transactional Db Compare Tool Variances Identified 3 2 1 6 SCR 727 Implementation Plan 5 MP to MP FasTrak Valid Variances To Be Resolved Portal NOIEs TDSPs & CRs

11. 11 Timing of Key Events February 5 th -20 th ……Extract development February 18 th ………. Market notification of SCR 727 February 18 th ……….DDL distributed and posted to ERCOT Portal February 21 st ………..“Technical” conference call February 24 th -27 th …..Creation of TDSP and LSE initial historical ESI ID Service History and Usage data extracts February 27 th ……….“Technical” conference call – 10:00 a.m. March 3 rd …………...Implementation – initial historical extracts posted to the ERCOT Portal, or CD with the initial historical extract will be sent to the applicable TDSPs and LSEs March 3 rd …………..Incremental daily ESI ID Service History and Usage update extracts from the day the initial historical extract was pulled through 3/1/03 will be posted to the ERCOT Portal March 4 th …………..Begin regular posting process to the ERCOT Portal of daily incremental ESI ID Service History and Usage update extracts March 4 th …………..“Business” Conference Call – 1:00 p.m. March 14 th …………TDSPs and CR to submit data extract variance requests for January 01 & 02, 2002