1. http://nodal.ercot.com 1 GENMAP Registration Workshop Jan 14, 2010

2. http://nodal.ercot.com 2 Antitrust Admonition ANTITRUST ADMONITION ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws. DISCLAIMER All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure.

3. http://nodal.ercot.com 3 Agenda Antitrust Admonition RARF Updates MP11 Timelines GENMAP Processing GENMAP Samples General info Q&A / Open Forum ERCOT asks that you log into the WebEx using your company name then your name. This will allow us to take roll call offline. If you have not logged in with your company name, please use the WebEx chat to tell the host your company is represented

4. http://nodal.ercot.com 4 Updates and Progress RARF Transmission Data Collection ended 12/01/2009 –203 total RARF sites –195 Accepted –8 sites Incomplete –60 sites missing PSSE data ( Contact NodalMarketTransition@ercot.com if having issues )NodalMarketTransition@ercot.com –Resource Readiness Scorecard posted http://nodal.ercot.com/readiness/scorecard/index.html

5. GENMAP OVERVIEW Identifying Resource Nodes – Key Reasons for Modeling Accuracy Network Operations Model –Annual/Monthly CRR Auctions. –MMS and EMS commercial and operations. DAM Clearing and Settlements –CRR offers and bids and offers. –DAM Resource-Specific Energy offers –DAM Energy Only offers. –DAM Energy bids 5

6. GENMAP OVERVIEW Identifying Resource Nodes – Key Reasons for Modeling Accuracy RTM Clearing and Settlements –Dispatch and Pricing. –Pricing for RTM settlement at Resource Node. –Pricing at EPS Meters for Production Settlement 6

7. GENMAP Processing http://nodal.ercot.com 7 Resource Node mapping is per Procedure for Identifying Resource Nodes (July 23, 2008) http://nodal.ercot.com/mktrules/np/index.html http://nodal.ercot.com/mktrules/np/index.html Nodal procedure allows 5 business days to turn GENMAP package around 10 business days per MP11 MP11 Metric applies to GENMAP, DME, RARF, and RARF True- Up

8. http://nodal.ercot.com 8 GENMAP Processing

9. http://nodal.ercot.com 9 Updates and Progress 2010 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MP11 - GENMAP Verifications (January 18 thru April 1) MP11 – DME Declarations (Dec 7 through January 8) MP11 - RARF True-up (February 1 thru April 1) Nodal Market Go-Live (December 1, 2010) MP11 - RARF Transmission Data (June 15 thru Dec 1, 2009)

10. http://nodal.ercot.com 10 GENMAP Package

11. GENMAP Sample one-line http://nodal.ercot.com 11 SAMPLE GENMAP ONE-LINE Test_Line1Test_Line2 Test_Line3 Dsw_G3 Dsw_G2 Dsw_S1 TEST_TESTUNIT3 TEST_TESTUNIT1 1220 1210 TEST_TESTUNIT2 Dsw_1231

12. http://nodal.ercot.com 12 GENMAP Unit-Associated Spreadsheets

13. http://nodal.ercot.com 13 GENMAP Non Unit-Associated Spreadsheets

14. GENMAP Defined http://nodal.ercot.com 14

15. http://nodal.ercot.com 15 GENMAP Unit-Associated Resource Node Spreadsheet

16. http://nodal.ercot.com 16 GENMAP Unit-Associated EPS Meter Spreadsheet

17. http://nodal.ercot.com 17 GENMAP Unit-Associated EPS Flow Spreadsheet 1.EPS Flow is FALSE if it points FROM the connected device listed 2.EPS Flow is TRUE if it points TO the connected device listed

18. http://nodal.ercot.com 18 GENMAP Non Unit-Associated EPS Meter Spreadsheet

19. http://nodal.ercot.com 19 GENMAP Non Unit-Associated EPS Flow Spreadsheet 1.EPS Flow is FALSE if it points FROM the connected device listed 2.EPS Flow is TRUE if it points TO the connected device listed

20. Resource Node & Meter Mapping Verification form http://nodal.ercot.com 20

21. General Info http://nodal.ercot.com 21 The one-lines are provided for two reasons – one to verify the accuracy of the meter and unit location on the one-line; the second as a tool to verify the mapping. Each node and meter will have reference “Connections”. Each item listed in the connection column will refer to all equipment electrically connected to the node or meter point. These connections are represented as [CB]1234 or [XFMR]U1 and are shown on the one-line screenshots. The connections column identifies the equipment type by offsetting the type in brackets, such as [CB]1234, where [CB] refers to the equipment type Circuit Breaker. The list below identifies the common equipment types : o [XFMR] Transformer o [CB] Circuit breaker o [DSC] Disconnect (switch) o [UN] Generation Unit o [LN] Line o [LD] Load o [SERIES] Series Device o [SVC] Static-Var  Note: Transformer naming convention in GENMAP pkg is power transformer concatenation and may not match names provided in the RARF. The one-line screenshot uses several colors to define the operating voltage of the equipment and buses represented. The list below identifies the voltages associated with each color: o Purple: 345kV o Green: 138kV o Blue: 69kV o Pink: Other voltages

22. Contact For questions contact NodalMarketTransition@ERCOT.com or your Account ManagerNodalMarketTransition@ERCOT.com You can request a private conference if necessary by sending an email or contacting you Account Manager. http://nodal.ercot.com 22

23. http://nodal.ercot.com 23 Q&A