1. OSI Regional Seminar 2008 Presented by: Kasen Huwa Sr. System Analysts, Xcel Energy Use of PI Process Book and Datalink Client tools for Energy Market Operations

2. 2 About Us  Responsible for economic dispatch of the generating fleet, energy and gas trading, risk management, and settlement accounting functions  Operate in the MISO market, SPP market and the PSCO bilateral market  Services 8 states and 3.3 million electricity customers  Generating capacity of about 16,000 MW  Peak obligation load of about 20,000 MW  No. 1 wind provider in the nation about 2,700 MW

3. Architecture of PI System Current Implementation and Future Plans

4. PI PI HA Collective PI Operations/Trade Decision Support Application (RDB) Interne t SPSPSCONSP Commercial Ops EMS OPC over ICCP PI to PI RDBMS HTML Custom VBA

5. PI HA Collective Operations/Trade Decision Support Application (RDB) Interne t SPSPSCONSP Commercial Ops DMZ EMS OPC over ICCP PI to PI RDBMS HTML Custom VBA 3 rd Party Data PI

6. Executive Process Book Displays Information at the Finger Tips of CEOs, Presidents, VPs, Directors and Managers

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13. Energy Markets Operations Day Ahead Traders, Real Time Traders, Real Time Operators, and Post Analysis

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18. Shared Display Collaboration and Communication using PI tools

19. 19 Gas Nominations and Burn  5 different groups need access to the same information with different variables  Spreadsheets were emailed, data was copied and pasted, some manual input, phone calls occurred when unclear  Groups had a disconnect. They saw the same data in different ways so even phone calls were confusing

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23. 23 Solution and Benefits  Use PI Datalink with VBA code to put the data in PI and then extract it into other spreadsheets  Saved over 5 hours a week of manual entry and copy/paste  Decreased errors and provided information quicker  Reduced email and phone traffic  Allowed groups to understand the same data with different variables

24. 24 Can be viewed at http://greenenergy.xcelenergy.com Sharing data on the web

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27. Post Analysis Using Datalink and Process Book

28. 28 Forecast - High Winds

29. 29 Scenarios - The Push - 12/24

30. 30 Scenarios - The Drop Off - 2/7

31. 31 Scenarios - A Dodge with a Push - 3/1

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33. 33 Benefits Using PI  Executive communication of KPIs  Multi-team collaboration  Contest ISO penalties  Make real-time decisions  Post analysis  Significant wind forecast improvement  Easy to update ongoing analysis  Users can pull their own data