System Average Interruption Frequency Index (SAIFI) (Electricity Outage Frequency)
This measure, System Average Interruption Frequency Index, or SAIFI in the energy industry, tracks the average number of times or frequency that a customer's electric service is interrupted during the fiscal year, and is an important indicator of the reliability of the system. This measure is affected by conditions such as weather and equipment failure. The SAIFI is an important industry indicator for electricity service providers.
The average is determined by dividing the total number of customers interrupted during the fiscal year by the average number of customers served.
FY 2015-16 Results
In FY 2015-16, Austin Energy (AE), continued to attain excellent reliability for distribution. The goal for this measure was established at 0.8 interruptions. The industry average, according to other utilities AE is benchmarked against, is 1.0 interruptions. AE’s FY 2015-16 actual was 0.68 interruptions, which is well under the established goal and comparable utilities’ average.
Assessment of Results
AE’s distribution reliability performance continues to beat industry averages. The 2015 Halloween flood, which occurred in FY 2015-16, caused substantial damage to an entire substation and increased the SAIFI average from FY 2014-15. The annual system line clearance maintenance cycle and targeted maintenance on AE’s electric system components helped to keep the results below target. AE has outperformed the industry average for the last five years.
An important component to this measure is the System Average Interruption Duration Index (SAIDI), which measures the average number of minutes customers are without service during each outage. The initial FY 2015-16 target for the average interruption duration was set at 60 minutes, with the industry standard at 90 minutes. In January 2016, the AE target was reduced to 57.22 minutes to align with results from the consulting firm First Quartile Consulting. The FY 2015‑16 SAIDI is 48.87 minutes, better than both of the targets.
AE will continue to pursue best operating and maintenance practices for its electric delivery system to ensure reliability which supports its Excellent Customer Service Strategy and will also continue with its line clearance and maintenance programs in order to maintain reliability at this level. A reliable electric delivery system is important to customer economics and customer satisfaction. The FY 2016-17 Budget includes $86.3 million in operations and maintenance for the Distribution and Transmission systems as well as $126.4 million in capital improvements to ensure reliability performance standards of the system continue to be met.
For more information contact Dan Smith, Vice President Electric Service Delivery, at (512) 505-7009.