Illinois Administrative Code › Title 83 - PUBLIC UTILITIES › Part 411 - ELECTRIC RELIABILITY › Subpart A - GENERAL › Section 411.20 - Definitions

Current through Register Vol. 48, No. 28, July 12, 2024
This Section defines terms as they are used in this Part.
"Alternative retail electric supplier" has the same meaning as
				  defined in Section 16-102 of the Public Utilities Act [220 ILCS
				  5/16-102 ].
"Controllable interruption" is an interruption caused or
				  exacerbated in scope and duration by the condition of facilities, equipment, or
				  premises owned or operated by a jurisdictional entity, or by the action or inaction
				  of persons under a jurisdictional entity's control and that could have been
				  prevented through the use of generally accepted engineering, construction, or
				  maintenance practices.
"Customer", for the purposes of this Part only, means a retail
				  customer, as that term is defined in Section 16-102 of the Act, or a single entity
				  that is using and has agreed to pay for electric power or energy, or electric
				  transmission or distribution service, from a jurisdictional entity in a wholesale
				  transaction. A single customer can have one or more points of service or meters at a
				  given location. Customer, for the purpose of this Part, shall not include entities
				  that are using electric power or energy unlawfully (e.g., through an illegal
				  tap).
"Distribution circuit" is a circuit owned and/or operated by a
				  jurisdictional entity and designed to operate at a nominal voltage of 15,000 volts
				  or less and to supply one or more distribution transformers.
"Distribution circuit interruption" is an interruption originating
				  at a point that is between the circuit interrupting device at the substation
				  supplying the distribution circuit and the distribution transformer.
"Electric service" means the availability of electric power and
				  energy purchased by the customer at the point of connection between jurisdictional
				  entity equipment and customer equipment, on those terms and conditions provided for
				  in the jurisdictional entity's tariffs, in its terms and conditions of service, or
				  in any contract between a jurisdictional entity and the customer.
"Electric utility" or "Utility" means a public utility, as defined
				  in Section 3-105 and Section 16-102 of the Act, that has a franchise, license,
				  permit or right to furnish or sell electricity to retail customers within a service
				  area.
"Facilities" includes all lines, cables, equipment, plant,
				  computer systems, customer service systems, apparatus, property, and any other items
				  of similar kind that are used to provide or that affects the reliability of
				  transmission, distribution or delivery services.
"Independent system operator" shall have the meanings given in
				  Article XVI of the Act [220 ILCS 5 /Art. XVI].
"Interruption" or "Outage", except as used in Sections
				  411.210
				  and
				  411.220,
				  means the failure or operation of a single component, or the simultaneous failure or
				  operation of physically and directly connected components of a jurisdictional
				  entity's transmission or distribution system that results in electric service to one
				  or more of its customers being lost or being provided at less than fifty percent of
				  standard voltage for a period longer than one minute in duration and requiring human
				  intervention by the jurisdictional entity to restore electric service.
Service to a multi-phase point of service is interrupted if
				  service to one or more phases is interrupted.
The Commission does not intend this definition to require a
				  jurisdictional entity to install and operate voltage sensing equipment specifically
				  to identify interruptions involving provision of service at less that fifty percent
				  of standard voltage.
This definition specifically excludes occurrences of the loss of
				  electric service when automatic switches, automatic line reclosing devices, or other
				  automatic jurisdictional entity devices successfully restore electric
				  service.
The term "interruption" or "outage" shall not include the
				  interruptions listed below.
Interruptions intentionally initiated by a jurisdictional entity,
				  pursuant to the provisions of an interruptible service tariff or contract and
				  affecting only those customers taking electric service under such tariff or
				  contract.
Interruptions intentionally initiated by a jurisdictional entity
				  for nonpayment of a bill and according to the provisions of Sections 8-201, 8-202,
				  8-203, 8-204, 8-205 and/or 8-206 of the Act [220 ILCS 5/8-201, 8 -202, 8-203, 8-205,
				  and 8-206] and 83 Ill. Adm. Code 280.
Interruptions intentionally initiated by a jurisdictional entity
				  due to tampering with service equipment.
Interruptions intentionally initiated by a jurisdictional entity
				  due to its being denied access to service equipment located on the affected
				  customer's private property.
Interruptions intentionally initiated by a jurisdictional entity
				  due to hazardous conditions located on the affected customer's private property
				  (such as a fire).
Interruptions intentionally initiated by a jurisdictional entity
				  due to a request by the affected customer.
Interruptions intentionally initiated by a jurisdictional entity
				  due to a request by a law enforcement agency, fire department, other governmental
				  agency responsible for public welfare, or any agency or authority responsible for
				  bulk power system security (e.g., North American Electric Reliability Council, a
				  regional reliability council, or an independent system operator).
Interruptions caused by the failure of a customer's equipment; the
				  operation of a customer's equipment in a manner inconsistent with statute, an
				  approved tariff, rule, regulation, or an agreement between the customer and the
				  jurisdictional entity; or the failure of a customer to take a required action that
				  would have avoided the interruption, such as failing to notify the jurisdictional
				  entity of an increase in load when required to do so by a tariff or contract.
Interruptions caused by the actions or omissions of another
				  jurisdictional entity or other supplier of electricity or electrical services shall
				  not be deemed an "interruption" of the jurisdictional entity providing transmission
				  and distribution services so long as that jurisdictional entity's transmission and
				  distribution facilities serving the customer remained operational.
Scheduled interruptions initiated by a jurisdictional entity for
				  repair, maintenance, or reinforcement shall not be considered an interruption for
				  the purposes of the targets set forth in Section
				  411.140(b)(4)
				   and calculating reliability indices. For all
				  other purposes under this Part, the term "interruption" shall include scheduled
				  interruptions initiated by a jurisdictional entity for repair, maintenance, or
				  reinforcement. Scheduled interruptions are reportable under Section
				  411.120(b)(3)(C).
As used in Sections
				  411.210
				  and 411.220, "Interruption" has the same meaning as when used in Section 16-125(e)
				  of the Act.
"Interruption duration" means a period of time measured in
				  one-minute increments that starts when a jurisdictional entity is notified or
				  becomes aware of an interruption and ends when a jurisdictional entity restores
				  electric service.
"Jurisdictional entity" means an electric utility or alternative
				  retail electric supplier owning, controlling, or operating transmission and
				  distribution facilities and equipment subject to the Commission's
				  jurisdiction.
"Operating area" is a geographic area defined by the
				  jurisdictional entity that is a distinct area for administration, operation, or data
				  collection with respect to the facilities serving, or the service provided within,
				  the geographic area.
"Power fluctuation" or "Surge," except as used in Sections
				  411.200,
				  411.210, and 411.220, means departure of more than one minute in duration in the
				  frequency or voltage of power supplied to the customer's point of service that is
				  caused by the failure or operation of a single component, or simultaneous failure or
				  operation of directly connected components, of a jurisdictional entity's
				  transmission or distribution system, that exceeds the Commission's standards for
				  frequency and voltage (or, where the customer and the jurisdictional entity have
				  agreed on frequency and voltage standards, exceeds the variation allowed thereby),
				  and that causes damage to customer goods. An interruption shall not be deemed a
				  power fluctuation. A power fluctuation or surge shall not include voltage variations
				  or frequency variations caused by:
Unpreventable damage due to weather events or conditions;
Customer tampering;
Unpreventable damage due to civil or international unrest or
				  animals; and
Damage to a jurisdictional entity's equipment or other actions by
				  a party other than the jurisdictional entity, its employees, agents, or
				  contractors.
As used in Section 411.200, the term "Power Fluctuation", and as
				  used in Sections
				  411.210
				  and 411.220, the term "Power Surge or other Fluctuation", have the same meanings as
				  when those terms are used in Section 16-125(f) of the Act.
"Reliability indices" are as listed below.
"System Average Interruption Frequency Index (SAIFI)" is the
				  average number of interruptions per customer during the year. It is calculated by
				  dividing the total annual number of customer interruptions by the total number of
				  customers served during the year.
SAIFI
=
Total Number of Customer Interruptions
Total Number of Customers Served
"Customer Average Interruption Duration Index (CAIDI)" is the
				  average interruption duration for those customers who experience interruptions
				  during the year. It is calculated by dividing the annual sum of all customer
				  interruption durations by the total number of customer interruptions.
CAIDI
=
Sum of all Customer Interruption Durations
Total Number of Customer Interruptions
"Customer Average Interruption Frequency Index (CAIFI)" is the
				  average number of interruptions for those customers who experience interruptions
				  during the year. It is calculated by dividing the total annual number of customer
				  interruptions by the total number of customers affected by interruptions. In
				  determining the total number of customers affected, each customer is counted only
				  once regardless of the number of customer interruptions that the customer may have
				  experienced during the year.
CAIFI
=
Total Number of Customer Interruptions
Total Number of Customers Affected
"Unpreventable damage" is damage interruptions or fluctuations
				  that could not be reasonably foreseen and prevented through the use of generally
				  accepted engineering, construction, and maintenance practices. For example, damage
				  shall be deemed unpreventable when it is:
Caused by a customer's failure to follow good engineering
				  practices with respect to its own equipment; or
When engineering, construction, operations, or maintenance
				  practices or actions have been identified and proposed by the jurisdictional entity
				  to prevent the interruption, fluctuation, or damage, but the jurisdictional entity
				  has not been allowed or permitted by a governmental authority or property owner to
				  implement such practices or actions.
"Worst-performing circuits" are those distribution circuits that,
				  for each reliability index, are among the one percent of all circuits in an
				  operating area (or at least one circuit for each reliability index) with the highest
				  achieved values (lowest performance levels) for the reliability index. For the
				  purpose of identifying worst-performing circuits, only distribution circuit
				  interruptions and customers affected by such interruptions shall be considered in
				  calculating the reliability indices.