4.901 Definitions

For purposes of this rule, the following definitions apply:

Customers Served

SAIFI is a measure of the average number of times that the average customer experienced an Outage.

Customers Out

CAIDI is a measure of the average length of time, in hours, that was required to restore service to customers who experienced an Outage.

(H) Non-Utility Power Supplier: any power supplier not holding a certificate of public good to provide retail distribution service.

4.902 Operating Guidelines

4.903 Recording and Reporting Requirements

(1) SAIFI and CAIDI reliability indices on a system-wide basis;

(2) A table showing the number of Outages and the total Customer Hours Out, system-wide, experienced during the reporting period due to each of the following categories of causes:

(a) Trees - Outages caused by the interaction of trees and tree branches (regardless of whether the tree originated inside or outside of the right-of-way) with the electric system, including Outages resulting from trees interacting with the electric system during severe weather. Tree-related Outages which result from operator error, accidents, or animals (e.g., beavers) should be listed under the respective cause-related category.

(b) Weather - Outages caused by wind, snow, lightning, ice, and flooding. Outages from weather events which cause trees to interact with the electrical system should be listed in the trees category.

(c) Company Initiated Outage - Outages caused by utility scheduled construction and maintenance.

(d) Equipment Failure - Outages caused by specific equipment failures such as transformer or arrester failures.

(e) Operator Error - Outages caused by utility or utility contractor error, including contract tree trimmer error.

(f) Accidents - Outages caused by accidents by other than utility employees or contractors, including the felling of trees into utility lines, as well as Outages resulting from emergencies such as police or fire department requests for shutdowns.

(g) Animals - Outages caused by the interaction of animals such as birds, squirrels, and racoons with the electric system. Outages also caused by trees, in which the root cause is the action of an animal, should also be placed in this category.

(h) Power Supplier - Outages caused by the loss of power supply from another utility.

(i) Non-Utility Power Supplier - Outages caused by the loss of power supply from a non-utility provider.

(j) Other - Outages with known causes that fall outside of the categories listed above.

(k) Unknown - Outages with causes unknown.

(3) An overall assessment of system reliability that addresses the areas where most Outages occur and the causes underlying most Outages. This assessment should be based on long-term reliability trends and consider the most recently compiled reliability data. Based on this assessment, the utility should describe, for both the long and short terms, appropriate and necessary activities, action plans, and implementation schedules for correcting any problems identified in the above assessment.