5.2. ERMUSR 01-11-2005J~
Elk River ---1
___.
1Vlunicipal Utilities
13069 Orono Parkway
Elk River, MN 55330
.lanuary 3, 2005
To: Elk River 1~~Iunicipal Utilities Commission
.lerrv Takle
James Tralle
.lohn Dietz
Frorn: Bryan Adams
Subject: Electric Outage Report
phone: 763.441.2020
Fax: 763.491.8099
"fhe Minnesota Energy, Security and Reliability Act enacted in 2001, contains a
distribution reliability section. One section of this legislation requires, on an annual
basis, an outage report be submitted to their governing bodies, which in our case is the,
Elk River Municipal Utilities Commission.
Your staff, for a number of years, has been documenting electrical outages to keep track
of causes, number of customers out of power and for how long in an effort to track trends
and resolve continued outage problems. This tracking now has the benefit of complying
with the distribution reliability section of this legislation. Our electric outage reporting
has been formalized so we can better track and analyze the number and causes of our
outages. The attached two page spread sheet reflects the outage history for 2004. In
summary, the distribution of outages, are as follows.
2003 2004
T}~pes of
Faults # of
Faults % Customer
Minutes
% # of
Faults
% Customer
Minutes
U.G. Faults 6 1 l.3 1,045 2.7 13 15.5 47,345 12.1
Dig-Ins 2 3.8 3,000 7.6 2 2.4 7,935 2
Termination
Failure
1
1.9
600
1.7
0
0
0
0
Transformer
Failure
3
5.7
565
1.4
1
1.2
120
.1
fuse Failure ] 0 18.8 3,445 8.8 9 l 0.7 2,245 .6
Connector 2 3.8 1,830 4.7 6 7.2 755 .2
Branches 1 1.9 450 1.1 17 20.2 11,655 3
Animal 1I 20.6 14,530 37.0 17 20.2 10,695 2.7
Transformer
Failure
1
1.9
300
.8
2
2.4
555
.1
Lighting
Arrestor
2
3.8
1;950
5.0
1
1.2
3,000
.7
Weather 10 18.9 10,695 27.2 7 8.3 101,560 25.8
Vehicle Hit
Pole
3
5.7
415
1.0
9
10.7
207,431
52.7
Wholesale
Sup Tier
1
1.9
400
1.0
0
0
0
0
53 100 39;225 100 84 100 393,296 100
The above table reflects no alarming trends or patterns. Weather and vehicles hitting
poles account for over 75% of customer minute outages. The number of branch outages
is up this year which indicates we need to increase our tree trimming efforts. The number
of outages, continue to increase due to our system growth.
A number of reliability indexes are evolving in the electric industry to make it easier to
compare performance of electrical utilities. These reliability indexes are:
1. ASAI (average service availability index)
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 v<~as
availab]e to the total customer minutes demanded in a time period. It is normally
expressed as a percentage.
ERMU's 2004 ASAI is 99.99%. This is a very good percentage for any utility.
2. CAIDI (customer average interruption duration index)
This is defined as the average length of an interruption, weighted by the number of
customers affected, for customers interrupted during a specific time period. It is
calculated by summing the customer minutes off during each interruption in the time
period and dividing this sum 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.
ERh~1U's 2004 CAIDI is 151.69. Our CAIDI is very high this year due to the sustained .
,.
outages from vehicles hitting poles.
3. SAIDI (system a~~erage interruption duration index)
This 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 the 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.
ERI\-1U's SAIDI is ~ 1.06. We do not as yet have a feel for this number if it is good,
average, or bad.
4. SAIFI (system a~~erage interruption frequency index)
This 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". Separate SAIFI indexes are sometimes calculated
for long and for short interruptions.
ERMU's 2004 SAIFI is .337.
Another statistic staff gets concerned about is the overage length of any outage. ERMU's
2003 average length of outage is 92.53 minutes. Electric utilities with a high percent of
underground facilities will exhibit higher length of outage times than electric utilities
with high percent of overhead facilities. ~'e are currently trying to find these statistics
from other electric utilities.
Staff has reviewed these statistics in detail to find ways to improve. These statistics are
in general very complementary to ERMU. Glenn Sundeen and his department continue
to do an outstanding job in constructing, operating and maintaining an electrical system
particularly in a fast growing area.
Other utilities statistics on CAIDI, SAIDI, and SAIFI are still difficult to obtain and
entities play some games with these numbers. Below is a table reflecting proposed 2004
numbers by Minnesota Public Utilities Commission (MPUC), for State IOU.
SAIDI SAIFI CAIDI
Minnesota Power 137.5 1.09 125.7
Otter Tail Power 69 to 42 23 to 1 I.8 4.44 to 1.8 ?
Xcel 172 to 98 9.4 to 1.44 1 19 to 94
Elk River Municipal Utilities S l .337 151
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