Circuit Reliability Review
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1 Circuit Reliability Review Tehachapi January 2018
2 Building a Smarter Grid for Southern California Southern California Edison is developing an electric grid to support California s transition to a clean and sustainable future that meets the needs and expectations of our customers. We are investing more than $13 billion in the power distribution grid over three years ( ). Our main investment goal is to increase power reliability through significant upgrades. The investments include: Upgrading cables, poles, switches and transformers Updating the grid so it can accommodate new technologies, such as smart inverters that will allow for the twoway flow of solar energy Adapting the power system to accommodate future California policy related to energy storage, electric transportation and renewable energy Providing enhanced automation and monitoring devices to allow us to better respond to changes on the grid Our investments in local communities will help ensure that customers receive safe, reliable, and affordable electricity now and in the future. Learn more at edison.com/innovation 2
3 Understanding Your Reliability Report As your electric utility, we want you to always have power when you need it. To get there, we constantly track and monitor electric outages across our service territory, and we measure our system reliability from this data. The two metrics we rely on are common in the electric utility industry: the System Average Interruption Duration Index (SAIDI) and the System Average Interruption Frequency Index (SAIFI). Both are described in more detail on the next page. Replacing and upgrading our infrastructure will help SCE maintain or improve SAIDI and SAIFI measurements. This report provides historical reliability data for the circuits that serve your jurisdiction and our proposed infrastructure upgrades for the current year. To view other reliability reports, visit sce.com>outage Center>Maintaining Reliable Service 3
4 Reliability Metrics MOMENTARY OUTAGES: OUTAGES LASTING 5 MINUTES OR LESS SUSTAINED OUTAGES: OUTAGES LASTING LONGER THAN 5 MINUTES MAIFI: o The number of times the average customer is interrupted by Momentary outages each year. SAIFI: o The number of times the average customer is interrupted by Sustained outages each year. SAIDI: o The cumulative amount of time the average customer is interrupted by Sustained outages each year. 4
5 Cities in the TEHACHAPI District CityList1 ALPINE FOREST BEAR VALLEY SPRINGS GOLDEN HILLS KEENE MOJAVE ROSAMOND SAND CANYON STALLION SPRINGS TEHACHAPI TWIN OAKS 5
6 * Exclusions are days which utilities are allowed to remove from their metrics because the outages on those days were caused by a severe acts of nature. **In the columns showing Rank, lower numbers indicate poorer performance. 6
7 Overview of Tehachapi CircuitList1 There are 7 circuits that serve Tehachapi 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers CUDDEBACK(12KV) 1, DINELY(12KV) GUST(12KV) LEVECHE(12KV) 2, METTLER(12KV) 2, TOMAHAWK(12KV) 2, VIENTO(12KV) 2, Grand Total 11,675 7
8 Reliability History of Circuits Serving Tehachapi (No Exclusions) BarChart SAIDI (average minutes of sustained interruptions) Tehachapi SCE SYSTEMWIDE SAIFI (average frequency of sustained interruptions) ** Exclusions are days which utilities are allowed to MAIFI (average frequency of momentary interruptions) remove from their metrics because the outages on those days were caused by acts of nature. **Data is as of 02/20/2018, data can be slightly different due to outage data validation process 0.0 8
9 Causes of Repair Outages in Tehachapi 2017 SAIDIChart Contributions to SAIDI by Outage Cause Vegetation /Animal 1.2% Equipment Failure e.g., in-service failure of transformer, switch, or conductors Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors Other e.g., patrolled but no cause found Operations e.g., urgent maintenance w/o 3-day notice 3 rd Party e.g., balloon, car hit pole, dig-in Operation 2.6% Other 11.4% Weather /Fire /Earthquake 13.9% Equipment Failure 46.8% 3rd Party 24.1% 3rd Party Equipment Failure Operation Other Vegetation /Animal Weather /Fire /Earthquake SAIDI = the cumulative amount of time the average customer is interrupted by sustained outages each year. 9
10 Causes of Repair Outages in Tehachapi 2017 SAIFIChart Weather /Fire /Earthquake 3.3% Contributions to SAIFI by Outage Cause Equipment Failure e.g., in-service failure of transformer, switch, or conductors Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors Other e.g., patrolled but no cause found Operations e.g., urgent maintenance w/o 3-day notice 3 rd Party e.g., balloon, car hit pole, dig-in Other 5.9% Operation 16.3% Vegetation /Animal 7.5% 3rd Party 20.3% Equipment Failure 46.7% 3rd Party Equipment Failure Operation Other Vegetation /Animal Weather /Fire /Earthquake SAIFI = the number of times the average customer is interrupted by sustained outages each year 10
11 11
12 12
13 Back-up Slides Reliability Histories of Circuits Serving Tehachapi Updated through Dec 2017
14 Average Reliability of 7 Circuits Serving Tehachapi CitySummary st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI 7 Circuits Serving Tehachapi -- Total Customers: 11, rd Party 11% 13% 21% 6% 8% 3% 5% 1% 7% 46% 37% 24% % 0% 23% 66% 22% 56% 24% 20% 25% Equipment Failure 49% 26% 21% 13% 26% 3% 54% 62% 21% 34% 54% 27% 100% 100% 9% 58% 78% 8% 12% 2% - 47% 47% 12% Operation 8% 37% 2% 14% 13% 0% 21% 11% 6% 2% 0% 4% 0% 0% - 1% 1% - 13% 52% - 3% 16% 1% Other 12% 6% 39% 15% 25% 58% 12% 20% 57% 11% 9% 41% % 15% 9% 59% 2% 0% 2% 11% 6% 42% Vegetation/Animal 3% 3% 3% 0% 0% 0% - - 3% - 31% 1% 0% 4% 8% 24% 42% 1% 7% 13% Weather/Fire/Earthquake 18% 15% 14% 52% 27% 36% 9% 5% 6% 7% 0% 3% % 25% 11% 5% % 3% 7% SCE SYSTEMWIDE Notes: No outages are excluded from the metrics. Outage Causes: Other: e.g., patrolled but no cause could be found Operations: e.g., urgent maintenance w/o 3-day notice to customers 3 rd Party: e.g., balloons, car hit pole, dig-in Vegetation/Animal: e.g., tree branch, rodent, or bird causing short circuit across conductors SAIDI (minutes) = the cumulative amount of time the average customer is interrupted by sustained (longer than 5 minutes) outages. SAIFI (interruptions) = the number of times the average customer is interrupted by sustained outages. MAIFI (interruptions) = the number of times the average customer is interrupted by momentary " (lasting 5 minutes or less) outages. 14
15 Reliability Histories for Individual Circuits Serving Tehachapi - 1 of st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI CUDDEBACK(12KV) - Customers: 1, CircuitHistory rd Party 60% 9% 100% 0% 0% % 80% 82% 43% % 0% 70% 98% 99% - 44% 53% 44% Equipment Failure 3% 0% - 9% 9% 1% 52% 64% 19% 6% 2% - 100% 100% - 22% 49% - 2% 1% - 14% 20% - Operation 37% 91% - 29% 32% 2% 8% 5% Other % 56% 37% 17% 14% 67% 14% 16% 52% % 23% 20% 17% 31% Vegetation/Animal % 0% 1% 0% - Weather/Fire/Earthquake % 3% 60% 23% 18% 6% - - 5% % 44% 27% 30% % 10% 25% DINELY(12KV) - Customers: rd Party Equipment Failure 33% Operation Other - 57% % % % Vegetation/Animal 100% 100% 100% % - - Weather/Fire/Earthquake - 14% - - GUST(12KV) - Customers: rd Party 2% 3% % - 100% 100% - 100% 100% - Equipment Failure 98% 97% - 13% 2% - 54% 35% 39% Operation % 76% Other - 100% 46% 65% 45% 100% - 100% Vegetation/Animal 5% Weather/Fire/Earthquake % 22% LEVECHE(12KV) - Customers: 2, rd Party 2% 3% - 31% 2% Equipment Failure 94% 95% - 69% 98% - 98% 99% - 100% 100% 100% 100% 42% % 100% 27% Operation Other 4% 2% 100% % 2% 1% 100% - 100% % - 73% Vegetation/Animal Weather/Fire/Earthquake 15
16 Reliability Histories for Individual Circuits Serving Tehachapi - 2 of 2 CircuitHistory st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI METTLER(12KV) - Customers: 2, rd Party 5% 4% 11% 18% 32% 6% 14% 1% 1% - 10% 12% - 1% 1% - Equipment Failure 56% 21% 39% 9% 7% - 12% 26% 11% 39% 83% 20% 100% 100% 100% 64% 82% - 77% 74% - 76% 90% 15% Operation 10% 46% 3% 0% 0% - 70% 35% 5% 21% 2% 19% 0% 0% - 0% 1% 5% 1% 6% Other 19% 13% 39% 4% 8% 56% 4% 38% 78% 40% 15% 61% - 77% 13% 14% 100% 10% 7% 66% Vegetation/Animal - - 6% 0% 0% % 20% - 12% Weather/Fire/Earthquake 10% 15% 2% 70% 53% 38% 0% 0% % 17% 3% % 1% 1% TOMAHAWK(12KV) - Customers: 2, rd Party % 97% - 50% 55% 20% 100% 28% 20% 73% Equipment Failure 0% 0% - 13% 8% 40% 2% 2% 75% % 100% % 0% - Operation % 7% - 3% 1% % 100% - 45% 80% - 32% 79% - Other 25% 50% - 27% Vegetation/Animal Weather/Fire/Earthquake 100% 100% 100% 68% 86% 60% % 100% % 1% - VIENTO(12KV) - Customers: 2, rd Party 64% 73% 39% % 1% 25% Equipment Failure % 39% - 82% 97% 3% 100% 100% 100% 100% 100% - 66% 50% 36% 1% 25% Operation 4% 2% % 2% 0% 25% - - 4% 20% 1% 0% - Other - - 5% 48% 52% 100% 6% 1% 22% 100% - 31% Vegetation/Animal 28% 25% 100% % 100% 100% 52% 98% 43% Weather/Fire/Earthquake 4% 0% 56% 38% 8% % % 30% 10% 0%
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