INTRODUCTION OUR SERVICES OUR WORKFORCE OUR ENVIRONMENTal INITIATIVES OUR COMMUNITY OUTREACH OUR ECONOMIC PERFORMANCE OUR GOVERNANCE, COMPLIANCE AND BUSINESS CONDUCT Our Reliability Record Toronto Hydro evaluates service reliability through two main measures: System Average Interruption Duration Index (SAI DI) and System Average Interruption Frequency Index (SAI FI). SAI DI is a measure of the annual average duration of outages for customers (in hours). SAI FI is a measure of the frequency of interruptions. In 2012, we saw a significant reduction in the average duration and frequency of outages. We exceeded both our targets for the year, achieving 1.03 hours SAI DI and 1.40 SAI FI respectively. This improvement is largely attributed to a reduction in inclement weather and the impact of our capital construction program. It can also be explained by the reduction in planned construction projects last year, which often require crews to interrupt power during work. S M T W T F S TORONTO HYDRO 2012 corporate respnosibility report 29 Do storms affect our reliability performance? Usually brought on by severe storms, major events are considered stresses that exceed the reasonable design and operational limits of the distribution system, and as a result, are analyzed separately in the industry and not included in SAI DI and SAI FI measures. In 2012, Hurricane Sandy qualified as a major event and the storm’s impact resulted in two major event days.
Toronto Hydro 2012 CR Report
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