Reports, Research and White Papers

• Forced Outage Performance of Transmission Equipment 
• Generation Equipment Status
• Annual Service Continuity Report on Distribution System Performance in Electrical Utilities

• over 200,000 kilometers of transmission lines
• over 20,000 circuit breakers
• over 5000 transformer banks
• over 900 kilometers in cables
• over 40 synchronous compensators
• over 20 static compensators
• over 1500 shunt reactor banks
• over 1200 shunt capacitor banks each
• over 100 series capacitor banks

• The mean duration for outages of transmission lines has been relatively stable over the five year period (2003-2007), showing a slight decrease of 15% in the final year.
• The number of outages on transmission lines also remained relatively stable over the five year period; however, the number of outages decreased significantly from 2006 to 2007, by 35%.

• Forced outage time due to transformer banks decreased by approximately 7% over the five year period ending in 2007. The number of forced outages also decreased by almost 8% over the same period.
• The number of forced outages for circuit breakers has increased consistently over five years. The increase for the five year period was approximately 11%.
• The number of forced outages for series capacitors decreased by 58%, however, the average time to repair increased significantly, by 83%.
• The number of outages due to cable performance decreased by 59%, however, the mean duration showed an increase of 189% over the five year period.
• The number of outages from 2003 to 2007 remained relatively stable while the mean duration of the outages decreased by 57% from 2003.
• The mean duration for outages and the number of outages for static compensator performance both remained relatively stable.
• The number of outages for shunt reactor banks remained relatively stable over the years, while the mean duration time of the outages decreased by 33% from 2003.
• The number of outages for shunt capacitor banks decreased by 13%, while the mean duration time of the outages increased by 55.8%.

• 456 Hydraulic Units resulting in total forced outage time of 8.4 years
• 80 Fossil Units(Coal, Oil, Natural Gas) resulting in total forced outage time of 3.3 years
• 29 Combustion Turbine Units resulting in total forced outage time of 109 days
• 11 Nuclear Units resulting in total forced outage time of 1.7 years

• Hydraulic Units – (1)Telecom and Communications, (2) Excitation
• Fossil Units – (1) Waterwalls, (2) Superheater
• Combustion Turbine Units – (1) Combustion Turbine, (2) Controls and Instrumentation
• Nuclear – (1) Reactor Reactivity Control Units, (2) Main Heat Transport Circuit

• Hydraulic –Increase of 78% over 5 years in average forced outage duration
• Fossil – 25% steady decrease in forced outages due to components in Steam Generation Facilities over 5 years
• Combustion Turbine – Experiencing a decrease in use although available over 5 year period
• Nuclear – Significant increase of 139% over 5 years in average forced outage duration

• System Average Interruption Frequency Index (SAIFI)
• System Average Interruption Duration Index (SAIDI)
• Customer Average Interruption Duration Index (CAIDI)
• Index of Reliability (IOR)

• set targets for improvement
• develop programs in support of their improvement targets
• make design/build decisions that try to mitigate interruption causes