Pacific Gas & Electric (PCG)

        Availability—A measure of time a Transmission Facility under ISO Operational Control is capable of providing service, whether or not it actually is in service.

        Availability Measures—The frequency and accumulated duration of Forced Outages^(IMS) for each of the Transmission Line Circuits within a Voltage Class for a given calendar year.

        Availability Measure Targets—The Availability performance goals established by the ISO.

        Forced Outage^(IMS)—A Forced Outage^(IMS) occurs when a Transmission Facility is in an Outage^(IMS) condition regardless of duration and: (1) there is no Scheduled Outage request in effect with respect to that period; or (2) the Transmission Facility is in an Outage^(IMS) condition for a period that exceeds the period specified in the Scheduled Outage request, in which case a Forced Outage^(IMS) is deemed to exist for the balance of the period, unless the PTO requests and is granted an extension to the approved Scheduled Outage request.

        ISO Maintenance Guidelines—Criteria presented herein which are to be followed by each PTO in preparing its PTO Maintenance Practices.

        ISO Maintenance Standards—Those maintenance standards which result from the combination of each PTO's Maintenance Practices and their respective Availability Measures.

        Maintenance—Maintenance as used herein, unless otherwise noted, encompasses inspection, assessment, maintenance, repair and replacement activities.

        Maintenance Coordination Committee—A committee responsible for recommending to the ISO modifications to and implementation of the ISO Maintenance Standards. The committee shall be organized and operate in accordance with Section 7.0 of this document.

        Outage^(IMS)—Any interruption of the flow of power in a Transmission Line Circuit between any terminals under ISO Operational Control.

        PTO—A Participating Transmission Owner as defined in Appendix D of the Transmission Control Agreement.

        PTO Maintenance Practices—A description of methods used by a PTO for the Maintenance of each substantial type of Transmission Facility or component in its system which is under the Operational Control of the ISO. The PTO Maintenance Practices are to be prepared in accordance with the ISO Maintenance Guidelines.

        Scheduled Outage—The removal from service of a Transmission Facility under ISO Operational Control to perform work on specific components in accordance with the requirements of the Transmission Control Agreement.

        Section 348 Criteria—The criteria for maintenance standards established by Section 348 of the California Public Utilities Code, as in effect from time to time, to "provide for high quality, safe and reliable service", taking into consideration "cost, local geography and weather, applicable codes, national electric industry practices, sound engineering judgment, and experience".

(1)

A term followed by the supercript "(IMS)" denotes a term which has a special, unique definition in this Appendix.

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        Stations—Facilities under the Operational Control of the ISO for purposes such as line termination, voltage transformation, voltage conversion, stabilization, or switching.

        Transmission Facilities—All equipment and components transferred to the ISO for Operational Control, pursuant to the Transmission Control Agreement, such as overhead and underground transmission lines, Stations, and system protection equipment.

        Transmission Line Circuit—The continuous set of transmission conductors located primarily outside of a Station, and apparatus terminating at interrupting devices which would be isolated from the transmission system following a fault on such equipment.

        Voltage Class—The voltage to which operating, performance, and maintenance characteristics are referenced. Voltage Classes are defined as follows: