5.2. ERMUSR 02-10-2015 Elk River
Municipal Utilities UTILITIES COMMISSION MEETING
TO: FROM:
Elk River Municipal Utilities Commission Wade Lovelette—Technical Services
John Dietz—Chair Superintendent
Al Nadeau—Vice Chair
Daryl Thompson—Trustee
MEETING DATE: AGENDA ITEM NUMBER:
February 10,2015 5.2
SUBJECT:
2014 Electric 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 Elk River Municipal Utilities Commission
adopted a number of parts of this chapter as a Distribution Reliability Standard policy requiring
annual reporting on system reliability.
DISCUSSION:
In 2014, our reliability index numbers remain excellent. 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. The table below reflects the number of customer outage minutes
from 2005 through 2014.
Year #of Customers # of Outage Minutes # of Outages
2005 8398 558,140 59
2006 8804 314,510 73
2007 9163 67,845 47
2008 9067 155,768 57
2009 9170 46,706 49
2010 9207 526,144 77
2011 9576 297,359 51
2012 9285 71,496 57
2013 9285 55,451 31
2014 9426 298,360 44
EN
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A number of reliability indexes are used in the electric industry to make it easier to compare
performance of electric utilities. These reliability indexes are:
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 2014 ASAI is 99.9913% Availability. ERMU's 2013 ASAI was 99.999%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 interruption in the time period and dividing this by the number of customers
experiencing one or more sustained 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 2014 CAIDI is 199.884 minutes. ERMU's 2013 CAIDI was 118.23 minutes.
System Average Interruption Duration Index (SAIDI)
SAIDI is defined as the average interruption duration for customers served during a specified
time period. It is determined by summing the customer minutes off for each interruption during
a specified time period and dividing that sum by the average number of customers served during
that period. The 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 2014 SAIDI is 44.056 minutes. ERMU's 2013 SAIDI was 5.97 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 customers interrupted in a time
period by the average number of customers served. The resulting unit is"interruptions per
customer."
ERMU's 2014 SAIFI is 0.22. ERMU's 2013 SAIFI was 0.0505.
Another statistic staff gets concerned about is the average length of any outage. Elk River
Municipal Utilities' 2014 average length of outage was 140.16 minutes. In 2013 the average
length of outage was 116.84 minutes. Electric utilities with a high percentage of underground
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facilities will exhibit higher length of outage time than electric utilities with more overhead
facilities.
Staff reviews these statistics in detail to find ways to continually improve our system. These
statistics are very good compared to other utilities. In 2014,birds and animals caused the greatest
number of outages resulting in 31.25%of our outage incidents. Outages resulting from branches
and/or trees made up 2.08%of our outage incidents. This low percentage is a reflection of the
good tree trimming our crews do during the winter. Other contributing factors include:
underground faults 16.67%; dig-ins, etc. 6.25%; component failure 4.17%; transformer failure
4.17%; fuse failure 10.42%; connector failure 12.50%; vehicle vs. pole 10.42%; and weather
related outages accounted for 2.08%of the incidents.
Many investor owned and cooperative run utilities "storm normalize"their reliability 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 customer actually experienced in 2014. Overall, our electric
distribution system is robust and our reliability is very high.
Last year we were able to compare our numbers with APPA's national statistics by region. At
this time we do not have those numbers; we expect to see them sometime next month.
I've attached a recent article from The Resource, Official Publication of Minnesota Municipal
Utilities Association, which features a local investor owned utilities reliability numbers that can
be used for comparison. Also attached is a graph of our number of outages by cause.
ACTION REQUESTED:
No action is required.
ATTACHMENTS:
• The Resource—Xcel Files 2013 Safety, Quality, Reliability Report; MPUC Sets
Standards for 2014-January 2015
• Graph of Elk River Municipal Utilities Number of Outages By Cause
•
OBEeED BY
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J A f'o l i f f r; Elk River Municipal Utilities Page 1 of 1
2/4/2015 8:33:36 AM Number of Outages By Cause
I Birds-Animals
15-
15 Birds-Animals
14 7 Human
5 OH Equip Fail
13: 4 Other
12 1 Trees
7 URD Equip Fail
11 4 Weather
10:
9
8- Human I URD Equip Fail
7
6-- OH Equip Fail
5- Other d Weather
4
3
2` Trees
11
o=
Birds-Animals Human OH Equip Fail Other Trees URD Equip Fail Weather
Starting date 01/01/2014 Included Outage Detail : Include All
Note: Multiple outage detail records may be only counted once.
Ending date 12/31/2014
64