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UTILITIES COMMISSION MEETING
TO:FROM:
ERMU Commission Chris Kerzman –Engineering Manager
MEETING DATE: AGENDA ITEM NUMBER:
April 12, 2022 5.2
SUBJECT:
Field Services Facility Expansion Project Update
ACTION REQUESTED:
None
DISCUSSION:
Over the past month, the contractors have continued with the installation of plumbing,
electrical, mechanical, and fire protection systems in the garage, inventory, maintenance, and
wash bay areas. Block wall installations has alsobegun. The roofer has had a couple setbacks
due to weather and is finishing up installation of the last portion of synthetic rubber with plans
to move into standing seam roof and siding installation.
Upcoming work for the next month is expected to include pouring of the concrete floor once
we get a dry stretch of weather, continuing window installation, and framing installation. The
garage area will continue to move along with the plumbing, electrical, mechanical, and fire
protection systems finishing up. Garage doors are currently projected to arrive during the last
weeks of May. RJM Construction is reaching out to City of Elk River’s building department to
understand what will be needed for a partial certificate of occupancy so that we can begin to
move inventory once garage doors are installed.
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UTILITIES COMMISSION MEETING
TO: FROM:
ERMU Commission Mike Tietz –Technical Services Superintendent
MEETING DATE: AGENDA ITEM NUMBER:
April 12, 2022 5.3
SUBJECT:
2021 Annual Reliability Report
ACTION REQUESTED:
Receive the 2021 Annual Reliability Report
BACKGROUND:
Minnesota Rules Chapter 7826 Public Utilities Commission Electric Utility Standards cover
safety, reliability, service, and reporting requirements. Per 7826.0100(A), municipal utilities are
exempt from these requirements. However, the ERMUCommission adopted several parts of
this chapter as a Distribution Reliability Standard policy requiring annual reporting on system
reliability.
DISCUSSION:
In 2021, our reliability index numbers remain very good. These reliability index numbers reflect
the condition of our robust electrical system as well as the superb response time from our local
line crews. This also reflects the local accountability, long term visioning on system design, and
ongoing system maintenance.
Year # of Customers# of Outage Minutes # of Outages
2012928571,49657
2013 9285 55,451 31
2014 9426 243,965 44
2015 9449 225,337 41
2016 10862 432,310 59
2017 11489 354,625 40
2018 12158 117,055 51
2019 12463 312,885* 59
2020 12604 197,884 51
2021 13038 628,670 61
*118,978 of these minutes are due to two separate transmission outages.
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Listed below are a number of reliability indices that are used bythe electric industry to make it
easier to compare performance among utilities along withERMU’s 2020and 2021 statistics.
Average Service Availability Index (ASAI)
ASAI is a measure of the average availability of the sub-transmission and distribution systems
to serve customers.It is the ratio of the total customer minutes that service was available to
the total customer minutes available in a time period. This is normally expressed as a
percentage.
ERMU’s 2021 ASAI is 99.9914% Availability ERMU’s 2020 ASAI is 99.9969% Availability
Customer Average Interruption Duration Index (CAIDI)
CAIDI is defined as the average duration (in minutes) of an interruption experienced by
customers during a specific time frame.It is calculated by summing the customer minutes off
during each sustained¹ interruption in the time period and dividing this by the number of
customers experiencing one or more sustained¹ interruptions during the time period. The
resulting unit is minutes. The index enables utilities to report the average duration of a
customer outage for those customers affected.
ERMU’s 2021 CAIDI is 126.25 minutes ERMU’s 2020 CAIDI is 99.689 minutes
System Average Interruption Duration Index (SAIDI)
SAIDI is defined as the average interruption duration (in minutes) for customers served
during a specified time period.It is determined by summingthe customer minutes off for each
sustained¹ interruption during a specified time period and dividing that sum by the average
number of customers served during that period. The resulting unit is minutes. This index
enables the utility to report how many minutes’ customers would have been out of service if all
customers were out at one time.
ERMU’s 2021 SAIDI is 49.261 minutes ERMU’s 2020 SAIDI was 15.795 minutes
System Average Interruption Frequency Index (SAIFI)
SAIFI is defined as the average number of times that a customer is interrupted during a
specified time period.It is determined by dividing the total number of sustained¹ interrupted
customers in a time period by the average number of customers served. The resulting unit is
“interruptions per customer.”
ERMU’s 2021 SAIFI is 0.39 ERMU’s 2020 SAIFI was 0.158
¹ Only outages lasting longer than five minutes are included in the calculations, as defined by IEEE 1366.
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Staff reviews these statistics in detail to find ways to continually improve our system. These
statistics are very good compared to other utilities. As indicated by the following pie chart and
statistics list, you can see the cause of the outages that we experienced in 2021.
Many investor owned and cooperative run utilities “storm normalize” theirreliability numbers
by removing “major outages” due to storms from their reliability index number calculations.
Our reliability numbers have not been storm normalized. Our numbers reflect these major
outages and represent what our customers experienced in 2021. Overall, our electric
distribution system is robust, and oursystemreliability is very high.
Please receive the attached American Public Power Association’s (APPA) eReliability Annual
Report which contains published averages that can be used to better understand the
performance of our electric system relative to other utilities nationally and to those within their
region or size class.
ATTACHMENT:
APPA eReliability Tracker 2021 Annual Report for ERMU
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