Delivering Reliable Power - Progress Energy

Delivering Reliable Power


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SAIDI is the total average time that a customer is without power during the year (excluding hurricanes or other major storms). MAIFI_E is the average frequency of events that a customer experiences in a year that result in zero voltage for a short duration. Note: In 2006, the Carolinas experienced a higher than average number of high-wind events that damaged transmission structures.

Delivering reliable power
We are pursuing our balanced solution strategy to ensure an adequate supply of clean, reliable, affordable power for our customers today and tomorrow. To ensure the dependable delivery of this power, our efforts to improve service reliability are more intensive than ever before. The powerlines that deliver electricity can be affected by many things, including inclement weather, animals, trees, people and equipment failures. Over the last several years, we have increased our preventive maintenance, installed equipment to reduce the number of customers affected by outages, installed special insulated wire in targeted areas, worked to reduce momentary interruptions, replaced more than 250 miles of underground cable, replaced thousands of power poles and transformers, renovated substations and maintained thousands of miles of rights of way. In 2008, we invested more than $98 million in improvements that make facilities less susceptible to storm damage in Florida.

Significant projected growth in our service territory requires investing millions of dollars in building and upgrading miles of electric transmission facilities to ensure a continued reliable supply of electric service to our homes and businesses.

We constantly monitor a variety of indices to ensure a superior level of customer reliability. One of the measures we use is the System Average Interruption Duration Index (SAIDI). This is the total average time that a customer is without power during the year (excluding hurricanes or other major storms). Another measure is the Momentary Average Interruption Event Frequency Index (MAIFI_E), which is the average frequency of events that a customer experiences in a year that result in zero voltage for a short duration.

Reliability trends for both Progress Energy Carolinas and Progress Energy Florida are in the industry’s top quartile. Performance improvements in the Florida system are attributable to an increased, continued focus on line reliability and maintenance.