1. Surviving a Mainframe Upgrade APPA – Business & Finance Conference Minneapolis, Minnesota September 19, 2006 Wayne Turnbow IS Department Manager

2. Who Are We? ·94,635 retail electric customers ·73% are residential ·TID is projecting a 3% annual growth rate for the next 7 years ·Peak demand - 476 MW (Summer Peak) ·Annual energy use: 1,814 gigawatt-hours (2005). ·Opened 250 MW Gas Turbine Plant 2006

3. Agenda Mainframe Upgrade What triggered upgrade Process Outcome Lessons learned

4. The Trigger

5. CIS History Y2K Project 1995 – Started discussions & Design 1997 – Began Coding (2) Full time developers 1999 – Production 63,000 Customers Nightly Billing Process 4-5 hours Avg Screen Response 2-8 sec New machine in 2001

6. How’s That Working for You? 2005 – 93,000 Customers Nightly Billing process 9 –12 hours Avg Screen Response 15 – 20 sec & higher Online reporting Minutes to respond 10’s of minutes to print Batch Processing Effecting Online Users Database Backups 1-2 hrs CIS Backup 4+ hrs

7. Houston, We Have a Problem! Slow machine Painfully slow screen response Long running applications Loss of productivity Developers CSR’s Accounting Delays Billing Payroll !!

8. The Process

9. Now What Do We Do? Stay were we are? Move off Mainframe? Replace box? Capacity Study 2 Studies were done Hardware vendor (Unisys) Hardware VAR (G-Force)

10. Capacity Study Results CPU Utilization Excessive Acceptable – 65% or less 80% or more CPU Utilization 40% of the time 100% CPU Utilization during peak periods

11. Capacity Study Results Processor Queue Depth Exceeded 2 processes 64% of the time Peak at 18 Disk Packs Pack contention CIS most severely effected Communications Channels - OK Memory - OK

12. Survey Says! “It is highly probable that some degree of service degradation was experienced because of these high Utilizations”

13. Screen to Screen Transition Old Box

14. Decision Time Current configuration Classified as a 31 MIPS machine 600 MB of Memory 256 GB of disk storage Tape Backup Replacement box Traditional purchase New metered environment

15. The Outcome

16. Unisys Libra 595 Flexible processing power Capable of 1400 MIPS Our expected usage is 20 MIPS per Month Reduces our cost Maintenance Software 4 GB of memory Greater than 1 Terabyte of storage Virtual Tape backup

17. The Upgrade Machine delivered in January Installation schedule February 3 rd On Time Hardware February 10 th On Time Software February 17 th On Time Acceptance testing completed February 24 th One Week Late Benchmarking completed February 26 th One Week Late System is live

18. The Results Average billing run time 45 – 90 Minutes Screen response time: sub second to 1-2 seconds Online reports printing Response in seconds Most reports are done before user gets to printer Batch operations No effect to Online users Database Backups Under 5 minutes CIS: 15 minutes

19. Screen to Screen Transition Unisys Libra 595

20. The Lessons Learned

21. What Went Wrong Waited too long to upgrade Missed Go-Live Target

22. What Went Right We have a problem Capacity Study to ID Problems Commitment from Management to Go Timing of New Equipment Timing of new licensing scheme Dedicated and Committed staff

23. The Pay Off

24. Questions