IAEC Reliability Webinar Presented by: Regi Goodale and Ethan Hohenadel December 11, 2009 1 How to Submit Your Question Step 1: Type in your question here. Step 2: Click on the Send button.
Agenda • Reliability Planning • Recording Interruptions • Computing Indices • Reliability Reporting 4 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 5 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.” 6
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 program d. IUB will consider the condition of the physical property and the size, training, supervision, availability, equipment, and mobility of the maintenance forces 7 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 8 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. 9
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. 10 Reliability Planning • IAEC resources – IAEC model reliability plan – IAEC reliability web page 11 Recording Interruptions • Review RUS Bulletin 1730A-119 12
Polling Question Did you participate in the NRECA webinar on RUS Bulletin 1730A-119? A.Yes B.No 13 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. 14 Interruption Exemptions 1. 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 ; 15
Interruption Exemptions 5. Interruptions due to hazardous conditions located on the affected customer’s private property; 6. 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. 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 17 Computing Reliability Indices • SAIFI – System Average Interruption Frequency Index • SAIDI – System Average Interruption Duration Index • CAIDI – Customer Average Interruption Duration Index 18
Computing Reliability Indices SAIFI = Total Number of Customer Interruptions/Total Number of Customers Served Average number of interruptions per customer during the year 19 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 20 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 21
Indices Example Electric utility serving a total number of 2,000 customers (meters). Duration No. of Date (Minutes) 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 22 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 2 . 5 α + β T MED e = 23 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 α + 2 . 5 β T MED e = 24
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 2 . 5 α + β T MED e = 25 Reliability Reporting • NRECA model template for computing • IAEC Example • IAEC general web page 26 Reliability Reporting • RUS • IUB – Annual Reliability Report – Notification and reporting of outages – IAEC Outage Map 27
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 – Pending Rule Making at IUB (RMU-2009-0004) 28 IAEC Outage Map • Purpose • IAEC role • REC role • outages.iowarec.org 29 Reliability Reporting • IAEC resources – IAEC model reliability report – IAEC reliability web page – IAEC annual REC specific reliability report – IOU Reliability reports (click here) 30
Review • Reliability General Guidelines • Reliability Plans • Recording Interruptions • Computing Indices • Reporting 31 How to Submit Your Question Step 1: Type in your question here. Step 2: Click on the Send button. Reliability Reporting Thank you for participating in today’s Web conference! Please complete the evaluation. 33
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