IAEC Reliability Webinar

Presented by: Regi Goodale and Ethan HohenadelDecember 11, 2009

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How to Submit Your Question

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Agenda

• Reliability Planning• Recording Interruptions• Computing Indices• Reliability Reporting

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Federal and State Regulations

• Federal– RUS Bulletin 1730A-119

• State– IAC 199-20.18 Service reliability requirements for

electric utilities– IAC 25.3 Inspection and maintenance plans

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Reliability Overview

• IAC 20.18 General Requirements• “Reliable electric service is of high importance

to the health, safety, and welfare of the citizens of Iowa.”

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Reliability General Obligations

a. Reasonable efforts to avoid and prevent interruptions of service

b. Transmission and distribution facilities shall be designed, constructed, maintained, and electrically reinforced and supplemented as required to perform reliably

c. Effective preventive maintenance programd. IUB will consider the condition of the physical

property and the size, training, supervision, availability, equipment, and mobility of the maintenance forces

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Reliability General Obligations

e. Keep records of interruptions of service on its primary distribution system and shall make an analysis of the records

f. Make reasonable efforts to reduce the risk of future interruptions

g. If unable to comply with applicable provisions file waiver request

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Reliability Planning

• 20.18(8)a. Reliability plan– Required to be adopted by local board and filed

with IUB. – Original plan was to be filed before July 1, 2003.– Must be updated by not less than annually.

– For instructions on how to file electronically with the IUB click here.

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Reliability Planning• IAC 20.18(8)a. Plan must describe:

– Current reliability programs, including:• Tree trimming cycle, including descriptions and explanations

of any changes to schedules and procedures reportable in accordance with 199 IAC 25.3(3)“c”;

• Animal contact reduction programs, if applicable;• Lightning outage mitigation programs, if applicable; and• Other programs the electric utility may identify as reliability-

related.– Current ability to track and monitor interruptions.– How the electric utility plans to communicate its plan

with customers/consumer owners.

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Reliability Planning

• IAEC resources– IAEC model reliability plan– IAEC reliability web page

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Recording Interruptions

• Review RUS Bulletin 1730A-119

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Definitions

• Interruption – A loss of electricity for any period longer than 5 minutes

• Outage – The state of a component when it is not available to perform its intended function as a result of an event directly associated with that component.

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Interruption Exemptions1. 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;

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Interruption Exemptions6. 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.

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Interruption Category Definitions• Power Supply – Any interruption originating from the

transmission system, sub-transmission system, or the substation, regardless of ownership

• Planned – Any interruption scheduled by the distribution system to safely perform routine maintenance

• Major Event – An interruption or group of interruptions caused by conditions that exceed the design and operational limits of a system. See IEEE Standard 1366-2003 and RUS Bulletin 1730A-119 Exhibit E

• All Other – All interruptions excluding above categories

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Computing Reliability Indices

• SAIFI – System Average Interruption Frequency Index

• SAIDI – System Average Interruption Duration Index

• CAIDI – Customer Average Interruption Duration Index

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Computing Reliability Indices

SAIFI = Total Number of Customer Interruptions/Total Number of Customers Served

Average number of interruptions per customer during the year

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Computing Reliability Indices

SAIDI = Sum of all Customer Interruption Durations/Total Number of Customers Served

Average Interruption Duration per Customer served during the year

Same as Reported on Form 7

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Computing Reliability Indices

CAIDI = Sum of All Customer Interruption Durations/Total Number of Customer Interruptions

Average Interruption Duration for those Customers who experience interruptions during the year

CAIDI = SAIDI/SAIFI

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Indices ExampleElectric utility serving a total number of 2,000 customers (meters).

DateDuration (Minutes)

No. of Customers

17-Mar 8.17 200 1,634.00 5-May 71.30 600 42,780.00

12-Jun 30.30 25 757.50 20-Aug 267.20 90 24,048.00 31-Aug 120.00 700 84,000.00 3-Sep 10.00 1,500 15,000.00

27-Oct 40.00 100 4,000.00 Sum 546.97 3,215 172,219.50

CAIDI 172,219.50 / 3,215 = 53.567 minutes

SAIDI 172,219.50 / 2,000 = 86.11 minutes

SAIFI 3,215 / 2,000 = 1.6075 interruptions per customer

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Major Event• Replaces Major Storm• Determined by statistical formula to find Major

Event days that the daily system SAIDI exceeds the threshold (T).

• Collect daily SAIDI for five sequential years ending on the last day of the last complete reporting period. If fewer than five years use all available data until five years of historical data are available

eT MED

5.222

Major Event

• Only Include those days that have a positive SAIDI index

• Find the natural logarithm of each daily SAIDI• Find α (Alpha) = Average of the logarithms• Find β (Beta) = Standard Deviation of the

logarithms

eT MED

5.223

Major Event

• Use Calculation below to determine the threshold

• Any daily SAIDI for the current reporting year that is greater than the threshold is considered a major event day

eT MED

5.2

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Reliability Reporting

• NRECA model template for computing • IAEC Example• IAEC general web page

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Reliability Reporting

• RUS• IUB

– Annual Reliability Report– Notification and reporting of outages – IAEC Outage Map

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Reliability Reporting• RUS Borrowers that borrow funds from RUS are required to report

the system average annual interruption minutes per consumer on Form 7 and Form 300. Shown in Table 1 is Part G of Form 7. Form 7 calls for four separate SAIDIs, as well as the total interruption time.

• IAC 20.18(8)b. Annual Reliability Report– Must be reviewed and approved by your local board by April 1 each

year.– Must be filed with the IUB after board approval– Must include previous 5 years reliability indices (SAIFI, SAIDI, CAIDI)

• IAC 20.19 Notification and reporting of outages– Current Rules

• Notification• Outage Report

– Completed Rule Making at IUB [RMU-2009-0004]

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IAEC Outage Map

• Purpose• IAEC role• REC role• http://outages.iowarec.org/

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Reliability Reporting

• IAEC resources– IAEC model reliability report– IAEC reliability web page– IAEC annual REC specific reliability report– IOU Reliability reports (click here)

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Review

• Reliability General Guidelines• Reliability Plans• Recording Interruptions• Computing Indices• Reporting

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How to Submit Your Question

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Reliability Reporting

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