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Texas Nodal Market Implementation Program Implementation Scenarios September 6, 2006

Texas Nodal Market Implementation Program Implementation Scenarios September 6, 2006. OTS FAT. OTS SAT. Scenario #1 – single release (baseline) (Nodal Market live & Zonal Market Shutdown July 2009). Q3 2006. Q4 2006. Q1 2007. Q2 2007. Q3 2007. Q4 2007. Q1 2008. Q2 2008. Q3 2008.

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Texas Nodal Market Implementation Program Implementation Scenarios September 6, 2006

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  1. Texas Nodal Market Implementation Program Implementation Scenarios September 6, 2006 http://nodal.ercot.com 1

  2. OTS FAT OTS SAT Scenario #1 – single release (baseline) (Nodal Market live & Zonal Market Shutdown July 2009) Q3 2006 Q4 2006 Q1 2007 Q2 2007 Q3 2007 Q4 2007 Q1 2008 Q2 2008 Q3 2008 Q4 2008 Q1 2009 Q2 2009 Q3 2009 NMMS Conceptual Design NMMS Build FAT SAT Common model update process NMMS Naming Convention DB Naming Convention information collection “UI in production” Model Data Certification Model Data Remediation Reconciliation EMS Requirements, Conceptual Design EMS EMS FAT EMS SAT EMS SCED Requirements, Conceptual Design SCED Build SCED FAT SCED SAT MMS MMS FAT MMS SAT MMS Requirements, Conceptual Design MMS Design, Build, Pre-FAT OS Requirements, Conceptual Design OS Build OS FAT OS SAT Outage Scheduler CRR Requirements, Conceptual Design CRR Design, Build, Pre-FAT CRR FAT CRR SAT CRR Credit Monitoring Registration ready Financial Transfer StatementsLayout Script test “Non-binding settlements” CS Requirements, Conceptual Design Commercial Systems Design, Build, Pre-FAT CS FAT CS SAT CS FAT CS SAT CS FAT CS SAT Commercial Systems MIS (SCED) Design, Build, Pre-FAT MIS FAT MIS SAT MIS (EMS/MMS/CRR) Design, Build, Pre-FAT MIS FAT MIS SAT MIS FAT MIS SAT MIS FAT MIS SAT MIS EDW Requirements, Conceptual Design EDW Design, Build, Pre-FAT EDW FAT EDW SAT EDW FAT EDW SAT EDW FAT EDW SAT EDW 168 hour market trial “CRR Auction for Go Live” End of Trials Business Requirements complete 10/30 Preliminary MP Interface Specs 12/31 MP Registration complete Final MP Interface Specs 3/31 MPSCED Offers Begin MP trial participation ERCOT & MP Readiness MP Nodal Registration MP Financial & Operational Qualification Qualification Freeze NODAL GO LIVE EDS 3 (TXMACS 0.3) SCED; MP SCED Offers EDS 4 MP SAT EDS 5 (TXMACS 0.5) TXMACS 1.0 Live operations EDS 3 Data Validation EDS 4 TXMACS 0.4) with selected MPs Early Delivery Systems http://nodal.ercot.com 2

  3. OTS FAT OTS ITEST Scenario #2 – 3 incremental releases & slack removed (Release 2 & Zonal Shutdown July ’08, Release 3 January ’09) Q3 2006 Q4 2006 Q1 2007 Q2 2007 Q3 2007 Q4 2007 Q1 2008 Q2 2008 Q3 2008 Q4 2008 Q1 2009 Q2 2009 Q3 2009 ITEST Common model update process FAT NMMS Conceptual Design NMMS Build Naming Convention DB Naming Convention information collection NMMS Planning UI Operations UI Model Data Certification Model Data Remediation Reconciliation EMS EMS Requirements, Conceptual Design EMS EMS FAT ITEST Outage Scheduler OS Requirements, Conceptual Design OS Build OS FAT ITEST SCED Requirements, Conceptual Design SCED Build SCED FAT ITEST MMS MMS Requirements, Conceptual Design MMS Design, Build, Pre-FAT MMS FAT ITEST CRR Requirements, Conceptual Design CRR Design, Build, Pre-FAT CRR FAT ITEST CRR Integration Requirements, Conceptual Design Build FAT ITEST FAT ITEST Registration ready StatementsLayout Script test CS Requirements, Conceptual Design Commercial Systems Design, Build, Pre-FAT CS FAT ITEST Commercial Systems MIS (SCED) Design, Build, Pre-FAT MIS FAT ITEST MIS (EMS/MMS/CRR) Design, Build, Pre-FAT MIS FAT ITEST MIS EDW Requirements, Conceptual Design EDW Design, Build, Pre-FAT EDW FAT ITEST EDW 168 hour market trial Business Requirements complete 10/30 Preliminary MP Interface Specs 12/31 MP Registration complete End of Trials Final MP Interface Specs 3/31 MPSCED Offers Begin MP trial participation ERCOT & MP Readiness MP Nodal Registration MP Financial & Operational Qualification Qualification Freeze Single Entry ModelGO LIVE Real Time Operations GO/NO GO Zonal ShutdownGO/NO GO EDS 1/2 Forward Markets GO/NO GO EDS 3 EDS 3 Data Validation Trials & Implementation EDS 4 MP SAT EDS 4 http://nodal.ercot.com 3

  4. OTS FAT OTS SAT 168 hour market trial MP Registration complete End of Trials MPSCED Offers Begin MP trial participation MP Nodal Registration MP Financial & Operational Qualification Qualification Freeze Scenario #3 – Release 2 & 3 combined & slack removed(Nodal Market live & Zonal Market Shutdown January 2009) Q3 2006 Q4 2006 Q1 2007 Q2 2007 Q3 2007 Q4 2007 Q1 2008 Q2 2008 Q3 2008 Q4 2008 Q1 2009 Q2 2009 Q3 2009 ITEST Common model update process FAT NMMS Conceptual Design NMMS Build Naming Convention DB Naming Convention information collection NMMS Planning UI Operations UI Model Data Certification Model Data Remediation Reconciliation EMS Requirements, Conceptual Design EMS EMS FAT EMS SAT EMS SCED Requirements, Conceptual Design SCED Build SCED FAT SCED SAT MMS MMS FAT MMS SAT MMS Requirements, Conceptual Design MMS Design, Build, Pre-FAT OS Requirements, Conceptual Design OS Build OS FAT OS SAT Outage Scheduler CRR Requirements, Conceptual Design CRR Design, Build, Pre-FAT CRR FAT CRR SAT CRR Registration ready StatementsLayout Script test CS Requirements, Conceptual Design Commercial Systems Design, Build, Pre-FAT CS FAT CS SAT Commercial Systems MIS (SCED) Design, Build, Pre-FAT MIS FAT MIS SAT MIS (EMS/MMS/CRR) Design, Build, Pre-FAT MIS FAT MIS SAT MIS EDW Requirements, Conceptual Design EDW Design, Build, Pre-FAT EDW FAT EDW SAT EDW Business Requirements complete 10/30 Preliminary MP Interface Specs 12/31 Final MP Interface Specs 3/31 ERCOT & MP Readiness Single Entry ModelGO LIVE NODAL GO LIVE EDS 1/2 EDS 3 Data Validation EDS 3 (TXMACS 0.3) SCED; MP SCED Offers EDS 4 TXMACS 0.4) with selected MPs EDS 4 MP SAT TXMACS 1.0 Live operations Early Delivery Systems http://nodal.ercot.com 4

  5. OTS FAT OTS ITEST EDS 4 MP SAT EDS 4 Scenario #4 – 3 incremental releases, timed for seasonality(Release 2 & Zonal Shutdown October ’08, Release 3 February ’09) Q3 2006 Q4 2006 Q1 2007 Q2 2007 Q3 2007 Q4 2007 Q1 2008 Q2 2008 Q3 2008 Q4 2008 Q1 2009 Q2 2009 Q3 2009 ITEST Common model update process FAT NMMS Conceptual Design NMMS Build Naming Convention DB Naming Convention information collection NMMS Planning UI Operations UI Model Data Certification Model Data Remediation Reconciliation EMS EMS Requirements, Conceptual Design EMS EMS FAT ITEST Outage Scheduler OS Requirements, Conceptual Design OS Build OS FAT ITEST SCED Requirements, Conceptual Design SCED Build SCED FAT ITEST MMS MMS Requirements, Conceptual Design MMS Design, Build, Pre-FAT MMS FAT ITEST CRR Requirements, Conceptual Design CRR Design, Build, Pre-FAT CRR FAT ITEST CRR Integration Requirements, Conceptual Design Build FAT ITEST FAT ITEST Registration ready StatementsLayout Script test CS Requirements, Conceptual Design Commercial Systems Design, Build, Pre-FAT CS FAT ITEST Commercial Systems MIS (SCED) Design, Build, Pre-FAT MIS FAT ITEST MIS (EMS/MMS/CRR) Design, Build, Pre-FAT MIS FAT ITEST MIS EDW Requirements, Conceptual Design EDW Design, Build, Pre-FAT EDW FAT ITEST EDW 168 hour market trial Business Requirements complete 10/30 Preliminary MP Interface Specs 12/31 MP Registration complete End of Trials Final MP Interface Specs 3/31 MPSCED Offers Begin MP trial participation ERCOT & MP Readiness MP Nodal Registration & Qualification sequence Single Entry ModelGO LIVE Real Time Operations GO/NO GO Zonal ShutdownGO/NO GO EDS 1/2 EDS 3 EDS 3 Data Validation Forward Markets GO/NO GO Trials & Implementation http://nodal.ercot.com 5

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