(3)
General
obligations.
a. Each electric
utility shall make reasonable efforts to avoid and prevent interruptions of
service. However, when interruptions occur, service shall be reestablished
within the shortest time practicable, consistent with safety.
b. The electric utility's electrical
transmission and distribution facilities shall be designed, constructed,
maintained, and electrically reinforced and supplemented as required to
reliably perform the power delivery burden placed upon them in the storm and
traffic hazard environment in which they are located.
c. Each electric utility shall carry on an
effective preventive maintenance program and shall be capable of emergency
repair work on a scale which its storm and traffic damage record indicates as
appropriate to its scope of operations and to the physical condition of its
transmission and distribution facilities.
d. In appraising the reliability of the
electric utility's transmission and distribution system, the board will
consider the condition of the physical property and the size, training,
supervision, availability, equipment, and mobility of the maintenance forces,
all as demonstrated in actual cases of storm and traffic damage to the
facilities.
e. Each electric
utility shall keep records of interruptions of service on its primary
distribution system and shall make an analysis of the records for the purpose
of determining steps to be taken to prevent recurrence of such
interruptions.
f. Each electric
utility shall make reasonable efforts to reduce the risk of future
interruptions by taking into account the age, condition, design, and
performance of transmission and distribution facilities and providing adequate
investment in the maintenance, repair, replacement, and upgrade of facilities
and equipment.
g. Any electric
utility unable to comply with applicable provisions of this rule may file a
waiver request pursuant to rule
199-1.3 (17A,474,476).
(4)
Definitions.
Terms and formulas when used in this rule are defined as follows:
"Customer" means (1) any person, firm,
association, or corporation, (2) any agency of the federal, state, or local
government, or (3) any legal entity responsible by law for payment of the
electric service from the electric utility which has a separately metered
electrical service point for which a bill is provided. Electrical service point
means the point of connection between the electric utility's equipment and the
customer's equipment. Each meter equals one customer. Retail customers are
end-use customers who purchase and ultimately consume electricity.
"Customer average interruption duration index (CAIDI)
" means 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.
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"Distribution system" means that part of the
electric system owned or operated by an electric utility and designed to
operate at a nominal voltage of 25,000 volts or less.
"Electric utility" means investor-owned
electric utilities and electric cooperative corporations and associations
owning, controlling, operating, or using transmission and distribution
facilities and equipment subject to the board's jurisdiction.
"GIS" means a geospatial information system.
This is an information management framework that allows the integration of
various data and geospatial information.
"Interrupting device" means a device capable
of being reclosed whose purpose is to interrupt faults and restore service or
disconnect loads. These devices can be manual, automatic, or motor-operated.
Examples may include transmission breakers, feeder breakers, line reclosers,
motor-operated switches, fuses, or other devices.
"Interruption" means a loss of service to
one or more customers or other facilities and is the result of one or more
component outages. The types of interruption include momentary event,
sustained, and scheduled. The following interruption causes shall not be
included in the calculation of the reliability indices:
1. Interruptions intentionally initiated
pursuant to the provisions of an interruptible service tariff or contract and
affecting only those customers taking electric service under such tariff or
contract;
2. Interruptions due to
nonpayment of a bill;
3.
Interruptions due to tampering with service equipment;
4. Interruptions due to denied access to
service equipment located on the affected customer's private
property;
5. Interruptions due to
hazardous conditions located on the affected customer's private
property;
6. Interruptions due to a
request by the affected customer;
7. Interruptions 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;
8. Interruptions caused
by the failure of a customer's equipment; the operation of a customer's
equipment in a manner inconsistent with law, an approved tariff, rule,
regulation, or an agreement between the customer and the electric utility; or
the failure of a customer to take a required action that would have avoided the
interruption, such as failing to notify the company of an increase in load when
required to do so by a tariff or contract.
"Interruption duration" as used herein in
regard to sustained outages means a period of time measured in one-minute
increments that starts when an electric utility is notified or becomes aware of
an interruption and ends when an electric utility restores electric service.
Durations of less than five minutes shall not be reported in sustained
outages.
"Interruption, momentary" means single
operation of an interrupting device that results in a voltage of zero. For
example, two breaker or recloser operations equals two momentary interruptions.
A momentary interruption is one in which power is restored
automatically.
"Interruption, momentary event" means an
interruption of electric service to one or more customers of duration limited
to the period required to restore service by an interrupting device. Note: Such
switching operations must be completed in a specified time not to exceed five
minutes. This definition includes all reclosing operations that occur within
five minutes of the first interruption. For example, if a recloser or breaker
operates two, three, or four times and then holds, the event shall be
considered one momentary event interruption.
"Interruption, scheduled" means an
interruption of electric power that results when a transmission or distribution
component is deliberately taken out of service at a selected time, usually for
the purposes of construction, preventive maintenance, or repair. If it is
possible to defer the interruption, the interruption is considered a scheduled
interruption.
"Interruption, sustained" means any
interruption not classified as a momentary event interruption. It is an
interruption of electric service that is not automatically or instantaneously
restored, with duration of greater than five minutes.
"Loss of service" means the loss of
electrical power, a complete loss of voltage, to one or more customers. This
does not include any of the power quality issues such as sags, swells,
impulses, or harmonics. Also see definition of "interruption."
"Major event" will be declared whenever
extensive physical damage to transmission and distribution facilities has
occurred within an electric utility's operating area due to unusually severe
and abnormal weather or event and:
1.
Wind speed exceeds 90 mph for the affected area, or
2. One-half inch of ice is present and wind
speed exceeds 40 mph for the affected area, or
3. Ten percent of the affected area total
customer count is incurring a loss of service for a length of time to exceed
five hours, or
4. 20,000 customers
in a metropolitan area are incurring a loss of service for a length of time to
exceed five hours.
"Meter " means, unless otherwise qualified,
a device that measures and registers the integral of an electrical quantity
with respect to time.
"Metropolitan area " means any community, or
group of contiguous communities, with a population of 20,000 individuals or
more.
"Momentary average interruption frequency index
(MAIFI)" means the average number of momentary electric service
interruptions for each customer during the year. It is calculated by dividing
the total number of customer momentary interruptions by the total number of
customers served.
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"OMS" is a computerized outage management
system.
"Operating area" means a geographical area
defined by the electric utility that is a distinct area for administration,
operation, or data collection with respect to the facilities serving, or the
service provided within, the geographical area.
"Outage " means the state of a component
when it is not available to perform its intended function due to some event
directly associated with that component. An outage may or may not cause an
interruption of service to customers, depending on system configuration.
"Power quality" means the characteristics of
electric power received by the customer, with the exception of sustained
interruptions and momentary event interruptions. Characteristics of electric
power that detract from its quality include waveform irregularities and voltage
variations, either prolonged or transient. Power quality problems shall
include, but are not limited to, disturbances such as high or low voltage,
voltage spikes and transients, flickers and voltage sags, surges and short-time
overvoltages, as well as harmonics and noise.
"Rural circuit" means a circuit not defined
as an urban circuit.
"System average interruption duration index
(SAIDI)" means the average interruption duration per customer served
during the year. It is calculated by dividing the sum of the customer
interruption durations by the total number of customers served during the
year.
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"System average interruption frequency index (SAIFI)
" means 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.
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"Total number of customers served" means the
total number of customers served on the last day of the reporting
period.
"Urban circuit" means a circuit where both
75 percent or more of its customers and 75 percent or more of its primary
circuit miles are located within a metropolitan area.
(7)
Annual reliability and service
quality report for utilities with more than 50,000 Iowa retail
customers. Each electric utility with over 50,000 Iowa retail
customers shall submit to the
board on or before May 1 of each year an annual
reliability report for the previous calendar year for the Iowa jurisdiction.
The report shall include the following information:
a.
Description of service
area. Urban and rural Iowa service territory customer count, Iowa
operating area customer count, if applicable, and major communities served
within each operating area.
b.
System reliability performance.
(1) An overall assessment of the reliability
performance, including the urban and rural SAIFI, SAIDI, and CAIDI reliability
indices for the previous calendar year for the Iowa service territory and each
defined Iowa operating area, if applicable. This assessment shall include
outages at the substation, transmission, and generation levels of the system
that directly result in sustained interruptions to customers on the
distribution system. These indices shall be calculated twice, once with the
data associated with major events and once without. This assessment should
contain tabular and graphical presentations of the trend for each index as well
as the trends of the major causes of interruptions.
(2) The urban and rural SAIFI, SAIDI, and
CAIDI reliability average indices for the previous five calendar years for the
Iowa service territory and each defined Iowa operating area, if applicable. The
reliability average indices shall include outages at the substation,
transmission, and generation levels of the system that directly result in
sustained interruptions to customers on the distribution system. Calculation of
the five-year average shall start with data from the year covered by the first
Annual Reliability Report submittal so that by the fifth Annual Reliability
Report submittal a complete five-year average shall be available. These indices
shall be calculated twice, once with the data associated with major events and
once without.
(3) The MAIFI
reliability indices for the previous five calendar years for the Iowa service
territory and each defined Iowa operating area for which momentary
interruptions are tracked. The first annual report should specify which
portions of the system are monitored for momentary interruptions, identify and
describe the quality of data used, and update as needed in subsequent
reports.
c.
Reporting on customer outages.
(1) The reporting electric utility shall
provide tables and graphical representations showing, in ascending order, the
total number of customers that experienced set numbers of sustained
interruptions during the year (i.e., the number of customers who experienced
zero interruptions, the number of customers who experienced one interruption,
two interruptions, three interruptions, and so on). The utility shall provide
this for each of the following:
1. All Iowa
customers, excluding major events.
2. All Iowa customers, including major
events.
(2) The
reporting electric utility shall provide tables and graphical representations
showing, in ascending order, the total number of customers that experienced a
set range of total annual sustained interruption duration during the year
(i.e., the number of customers who experienced zero hours total duration, the
number of customers who experienced greater than 0.0833 but less than 0.5 hour
total duration, the number of customers who experienced greater than 0.5 but
less than 1.0 hour total duration, and so on, reflecting half-hour increments
of duration). The utility shall provide this for each of the following:
1. All Iowa customers, excluding major
events.
2. All Iowa customers,
including major events.
d.
Major event summary. For
each major event that occurred in the reporting period, the following
information shall be provided:
(1) A
description of the area(s) impacted by each major event;
(2) The total number of customers interrupted
by each major event;
(3) The total
number of customer-minutes interrupted by each major event; and
(4) Updated damage cost estimates to the
electric utility's facilities.
e.
Information on transmission and
distribution facilities.
(1) Total
circuit miles of electric distribution line in service at year's end,
segregated by voltage level. Reasonable groupings of lines with similar voltage
levels, such as but not limited to 12,000- and 13,000-volt three-phase
facilities, are acceptable.
(2)
Total circuit miles of electric transmission line in service at year's end,
segregated by voltage level.
f.
Plans and status report.
A plan for service quality improvements, including costs, for the
electric utility's transmission and distribution facilities that will ensure
quality, safe, and reliable delivery of energy to customers.
g.
Capital expenditure
information. Reporting of capital expenditure information shall start
with data from the year covered by the first Annual Reliability Report
submittal so that by the fifth Annual Reliability Report submittal five years
of data shall be available in each subsequent annual report.
(1) Each electric utility shall report on an
annual basis the total of:
1. Capital
investment in the electric utility's Iowa-based transmission and distribution
infrastructure approved by its board of directors or other appropriate
authority. If any amounts approved by the board of directors are designated for
use in a recovery from a major event, those amounts shall be identified in
addition to the total.
2. Capital
investment expenditures in the electric utility's Iowa-based transmission and
distribution infrastructure. If any expenditures were utilized in a recovery
from a major event, those amounts shall be identified in addition to the
total.
(2) Each electric
utility shall report the same capital expenditure data from the past five years
in the same fashion as in 20.18(7) "g"(1).
h.
Maintenance.
Reporting of maintenance information shall start with data from the year
covered by the first Annual Reliability Report submittal so that by the fifth
Annual Reliability Report submittal five years of data shall be available in
each subsequent annual report.
(1) Total
maintenance budgets and expenditures for distribution, and for transmission,
for each operating area, if applicable, and for the electric utility's entire
Iowa system for the past five years. If any maintenance budgets and
expenditures are designated for use in a recovery from a major event, or were
used in a recovery from a major event, respectively, those amounts shall be
identified in addition to the totals.
(2) Tree trimming.
1. The budget and expenditures described in
20.18(7)"h "(1) shall be stated in such a way that the total
annual tree trimming budget expenditures shall be identifiable for each
operating area and for the electric utility's entire Iowa system for the past
five years.
2. Total annual
projected and actual miles of transmission line and of distribution line for
which trees were trimmed for the reporting year for each operating area and for
the electric utility's entire Iowa system for the reporting year, compared to
the past five years. If the utility has utilized, or would prefer to utilize,
an alternative method or methods of tracking physical tree trimming progress,
it may propose the use of that method or methods to the board in a request for
waiver.
3. In the event the
utility's actual tree trimming performance, based on how the utility tracks its
tree trimming as described in 20.18(7) "h"(2)"1," lags behind
its planned trimming schedule by more than six months, the utility shall be
required to file for the board's approval additional tree trimming status
reports on a quarterly basis. Such reports shall describe the steps the utility
will take to remediate its tree trimming performance and backlog. The
additional quarterly reports shall continue until the utility's backlog has
been reduced to zero.
i. The annual reliability report shall
include the number of poles inspected, the number rejected, and the number
replaced.
