5.3. ERMUSR 01-10-2006!~ Ji
Elk River
Municipal Utilities ~
13069 Orono Parkway "` phone: 763.441.2020
Elk River, MN 55330 V~ Fax: 763.491.8099
January 3, 2006
To: Elk River Municipal Utilities Commission
Jerry Takle
John Dietz
Jim Tralle
From: Bryan Adams
Subject: Electric Outage Report
"The 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 o.f 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 2005. In
summary, the distribution of outages, are as follows.
2004 2005
Types of
Faults # of
Faults % Customer
Minutes
% # of
Faults
% Customer
Minutes
U.G. Faults 13 15.5 47,345 12.1 9 15.5 8,900 1.6
Dig-Ins 2 2.4 7,935 2 3 5.2 1,820 .3
Termination
Failure
0
0
0
0
1
1.7
480
.1
Transformer
Failure
1
1.2
120
.l
4
6.9
1,650
.3
Fuse Failure 9 10.7 2,245 .6 4 6.9 3,525 .6
Connector 6 7.2 755 .2 4 6.9 340 .1
Branches 17 20.2 11,655 3 3 5.2 1620 .3
Animal 17 20.2 10,695 2.7 14 24.1 3,410 .6
Transformer
Failure
2
2.4
555
.1
0
0
0
0
Lighting
Arrestor
1
1.2
3,000
.7
0
0
0
0
Weather 7 8.3 101,560 25.8 8 13.8 423,980 76.0
Vehicle Hit
Pole
9
10.7
207,431
52.7
6
10.3
107,715
19.3
Wholesale
Supplier
0
0
0
0
2
3.5
4,700
.8
84 100 393,296 100 58 100 558,140 100
The above table reflects no alarming trends or patterns. Weather and vehicles hitting
poles account for over 95% of customer minute outages. "The number of branch outages
is down this year which indicates our tree trimming efforts are paying off. The number
of outages actually decreases regardless of 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 was
available to the total customer minutes demanded in a time period. It is normally
expressed as a percentage.
ERMU's 2005 ASAI is 99.87%. 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. 1t 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.
ERMU's 2005 CAIDI is 111.43.
3. SAIDI (system average 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.
ERMU's 2005 SAIDI is 66.46. We do not as yet have a feel for this number if it is good,
average, or bad.
4. SAIFI (system average 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 2005 SAIFI is .596.
Another statistic staff gets concerned about is the overage length of any outage. ERMU's
2005 average length of outage is 83.56 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. We 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 11.8 4.44 to 1.8 ?
Xcel 172 to 98 9.4 to 1.44 119 to 94
Elk River Municipal Utilities 66 .596 11 1
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