1. 1 Entergy Transmission Asset Preservation Department 2004 Objectives Entergy Transmission Planning Summit New Orleans, LA July 10, 2003

2. 2 Asset Preservation Transmission 2004 Objectives Improve Transmission System Reliability Reduce Transmission System Average Interruption Frequency Index (“TSAIFI”) Reduce Transmission System Average Interruption Duration Index (“TSAIDI”)

3. 3 Main Substation Transmission Outage Causes Switches Breakers Relay Misoperations Arresters Potential & Current Transformers Substation-Related Outages by Cause (System)

4. 4 Substation Equipment Age Description Qty. Transmission Transformer (270): –Average age: 28 years Description Qty. Qty. H V Circuit Breaker: Oil (1700) Gas (780) –Average age: 32years 12years

5. 5 Improve System Reliability Substation Equipment Maintenance Transformer Maintenance: –Dissolve Gas Analysis every year –TTR (Turn to Turn Ratio) every 4 years –Doble Test and Meggar Test every 4 years –Load Tap Changer inspection every 2 years

6. 6 Circuit Breaker Maintenance : –Speed test and External Inspection every 5 years –Oil dielectric test every year –Power factor bushings every 10 years –Test SF6 moisture for Gas Circuit Breakers every 5 years Substation Inspections –Visual inspection every month (Infrared, coronascope, SF 6 Gas detection camera, ultrasonic detector) Relay Maintenance –DC Operational Test & Panel Inspection every 4 years –Relay Calibration every 4 years Improve System Reliability Substation Equipment Maintenance

7. 7 Reduce TSAIFI and TSAIDI Substation Outage Reduction Programs Circuit Switch Replacement –replace damaged components Arrester Replacement –replace silicon carbide arresters with MOVs Breaker Replacement –replace aged breakers that are obsolete Breaker Additions –install breakers in strategic substations to isolate the majority of customers from outages and reduce the length of the outage Automatic Sectionalizing –Add motor operated switches allowing remote sectionalizing reducing outage times

8. 8 RTU Retrofits –Install new RTUs in stations without one, reducing outage duration –Replace obsolete equipment on a priority basis, reducing outages and outage duration Pin and Cap Replacement –replace pin & cap insulators with new station post insulators Circuit Switcher Replacement –replace damaged components and aged equipment Transformer Life Extension –Re-blocking and Re-gasketting (Depends on age, manufacturer, size, paper and clamping type of the unit) Reduce TSAIFI and TSAIDI Substation Outage Reduction Programs

9. 9 Main Transmission Line Outage Causes Lightning Line Material Failure Vegetation Storms Contamination

10. 10 Transmission Line Miles

11. 11 Transmission Line Age

12. 12 Improve System Reliability T-lines Maintenance cycles Climbing inspection –8 Year cycle Aerial patrol –System is flown 2 times per year Vegetation –Urban tree trimming 3 Year cycle –Mowing 2-5 Year cycle –Herbicide 4-5 Year cycle –Side trimming of ROW 9 Year cycle Osmose - Ground line inspection – North Louisiana and Arkansas 12 Year cycle – Mississippi and Texas 10 Year cycle – South Louisiana 8 Year cycle

13. 13 Reduce TSAIFI and TSAIDI T-Line Outage Reduction Programs Wood pole replacement –replace wood pole with concrete Shield wire replacement –replace age and corroded shield wire Hazard tree removal –target trees off of the right-of-way that pose a threat 69 KV line outage reduction program –Crossarm and insulator removal –Replacement with polymer post insulators –Replace bonding and grounding

14. 14 Transmission System Metrics

15. 15 Transmission System Metrics

16. 16 Transmission System Metrics