Circuit Reliability Review

Circuit Reliability Review Rancho Santa Margarita January 2018

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 (2017-19). 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

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

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

Cities in the SADDLEBACK District CityList1 ALISO VIEJO COTO DE CAZA IRVINE LAGUNA BEACH LAGUNA HILLS LAGUNA NIGUEL LAGUNA WOODS LAKE FOREST LAS FLORES MISSION VIEJO RANCHO SANTA MARGARITA 5

* 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

Overview of Rancho Santa Margarita CircuitList1 There are 17 circuits that serve Rancho Santa Margarita 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers AUDUBON(12KV) 1,779 - - - CAZA(12KV) 455 - - - CLEVELAND(12KV) 1,816 - - - COOLER(12KV) 1,575 - - - EMPRESA(12KV) 1,308 - - - FIZZ(12KV) 1,676 - - - FOGCUTTER(12KV) 2,321 - - - GRASSHOPPER(12KV) 1,738 - - - MELINDA(12KV) 1,393 - - - MODJESKA(12KV) 1,775 - - - OLYMPIAD(12KV) 1,003 - - - PAJARO(12KV) 1,900 - - - RANCH(12KV) 1,549 - - - RUSTIC(12KV) 3,096 - - - SCOTCH(12KV) 2,617 - - - SHOOTER(12KV) 1,251 - - - WHISKEY(12KV) 1,528 - - - Grand Total 28,780 7

Reliability History of Circuits Serving Rancho Santa Margarita (No Exclusions) BarChart 2014 2015 2016 2017 SAIDI (average minutes of sustained interruptions) 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 84.5 112.1 114.8 32.1 76.8 134.5 139.7 69.2 Rancho Santa Margarita 0.0 SAIFI (average frequency of sustained interruptions) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.6 1.0 0.4 0.9 0.5 1.1 0.4 1.2 SCE SYSTEMWIDE ** Exclusions are days which utilities are allowed to MAIFI (average frequency of momentary interruptions) 2.0 1.5 1.0 0.5 0.0 0.3 1.4 1.4 0.1 0.1 1.6 1.1 1.8 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 8

Causes of Repair Outages in Rancho Santa Margarita 2017 SAIDIChart Weather /Fire /Earthquake 0.9% Contributions to SAIDI by Outage Cause Vegetation /Animal 0.0% 3rd Party 1.4% Other 3.7% 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 10.9% Equipment Failure 83.1% 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

Causes of Repair Outages in Rancho Santa Margarita 2017 SAIFIChart Other 0.4% Vegetation /Animal 0.0% 3rd Party 3.5% Contributions to SAIFI by Outage Cause Weather /Fire /Earthquake 7.8% 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 12.8% Equipment Failure 75.5% 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

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Back-up Slides Reliability Histories of Circuits Serving Rancho Santa Margarita Updated through Dec 2017

Average Reliability of 17 Circuits Serving Rancho Santa Margarita CitySummary 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI 17 Circuits Serving Rancho Santa Margarita -- Total Customers: 28,780 84.5 0.6 0.3 32.1 0.4 0.1 76.8 0.5 0.1 31.7 0.1 0.1 6.9 0.1 0.0 12.5 0.1 1.0 18.1 0.1 0.0 69.2 0.4 1.1 3rd Party 3% 5% 57% 1% 3% 33% 5% 10% 52% - - - 1% 0% - 7% 11% 0% - - - 1% 3% 0% Equipment Failure 75% 66% 10% 71% 78% - 90% 77% 10% 73% 67% 51% 95% 95% - 86% 60% 0% 95% 93% 100% 83% 75% 6% Operation 17% 26% 19% 24% 19% - 5% 13% - 19% 32% 44% 4% 5% - 2% 4% - 5% 7% - 11% 13% 5% Other 1% 0% 3% 1% 0% 2% - - 38% 8% 1% 5% 1% 0% 100% 0% 0% 1% 0% 0% - 4% 0% 3% Vegetation/Animal 0% 0% 12% 3% 0% 65% - - Weather/Fire/Earthquake 3% 1% - 5% 25% 98% - - - 1% 8% 86% SCE SYSTEMWIDE 112.1 1.0 1.4 114.8 0.9 1.4 134.5 1.1 1.6 42.6 0.3 0.5 23.6 0.2 0.4 29.2 0.2 0.4 44.3 0.4 0.5 139.7 1.2 1.8 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

Reliability Histories for Individual Circuits Serving Rancho Santa Margarita - 1 of 5 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI AUDUBON(12KV) - Customers: 1,779 0.0 0.0-10.1 0.0 1.0 - CircuitHistory - - 1.0-1.0 3rd Party - - - 1 - Equipment Failure Operation 100% 100% - - Vegetation/Animal - - - 100% 100% 100% - - Weather/Fire/Earthquake - 100% - 100% CAZA(12KV) - Customers: 455 - - - 26.0 0.0 1.0-7.1 0.0 1.0 - - - 7.1 0.0 1.0 3rd Party Equipment Failure Operation - - - 100% 100% 100% 100% - Vegetation/Animal - - - 100% 100% 100% - - Weather/Fire/Earthquake - 100% - 100% CLEVELAND(12KV) - Customers: 1,816 1.4 0.0 - - - 1.0 205.2 1.0-205.2 1.0 1.0 3rd Party Equipment Failure - - 100% 100% - 100% 100% - Operation 100% 100% - - Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% COOLER(12KV) - Customers: 1,575 - - - 95.3 1.2-13.9 0.1-104.9 0.5 0.9 102.2 1.0-3.6 0.5 0.5 - - - 210.6 2.1 1.4 3rd Party Equipment Failure - - - 89% 94% - 91% 86% 100% 100% - - - 49% 48% - Operation - - - 11% 6% - 9% 14% - 100% 100% 100% - 50% 26% 67% Vegetation/Animal Weather/Fire/Earthquake - - - 100% 100% 100% - - - 2% 26% 33% 15

Reliability Histories for Individual Circuits Serving Rancho Santa Margarita - 2 of 5 CircuitHistory 2 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI 2017 EMPRESA(12KV) - Customers: 1,308 510.9 1.0 295.0 1.1 1.4 1.0-1.0 3rd Party - - 2% 11% 80% - - - Equipment Failure 100% 99% 98% 89% 20% - - - Operation 0% 1% - - Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% FIZZ(12KV) - Customers: 1,676 14.2 0.5 1.0 75.6 1.5-0.1 0.0-1.0-1.0 3rd Party 77% 4% 100% - Equipment Failure - - - 82% 69% - 100% 100% Operation 23% 96% - 18% 31% - - - Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% FOGCUTTER(12KV) - Customers: 2,321 161.0 1.1-61.9 1.0-12.1 0.1-1.0 5.0 0.1-5.0 0.1 1.0 3rd Party Equipment Failure 66% 96% - 100% 100% - 49% 26% - - 100% 100% - 100% 100% - Operation 34% 4% 51% 74% Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% GRASSHOPPER(12KV) - Customers: 1,738 31.4 0.2 0.0 66.0 0.5-218.0 1.2-6.4 0.1-0.5 0.0-164.5 1.3 1.0 27.3 0.1-198.7 1.5 1.0 3rd Party Equipment Failure 87% 26% - 30% 16% - 96% 92% - - - 98% 93% - 100% 100% - 95% 86% - Operation 13% 74% 100% 70% 84% - 4% 8% - 100% 100% - 100% 100% - 2% 7% 5% 14% - Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% 16

Reliability Histories for Individual Circuits Serving Rancho Santa Margarita - 3 of 5 CircuitHistory 3 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI MELINDA(12KV) - Customers: 1,393 - - - 61.9 1.0-55.0 0.1 - - - 18.3 0.1 1.0 41.3 0.2 0.1 59.6 0.3 1.1 3rd Party Equipment Failure - - - 100% 100% - 91% 54% - - - 100% 100% 3% 56% 44% 100% 70% 55% 10% Operation - - 9% 46% - - 44% 56% - 30% 45% - Vegetation/Animal Weather/Fire/Earthquake - 97% - 90% MODJESKA(12KV) - Customers: 1,775 123.1 0.3 0.9 10.9 0.1-170.4 1.2-330.9 1.0 1.0-1.0 - - - 330.9 1.0 2.0 3rd Party Equipment Failure 68% 70% - 100% 100% - 95% 92% - 100% 100% 100% - 100% 100% 50% Operation 32% 30% 100% - - - 5% 8% - 0% 0% - - 0% 0% - Other - - 1% - Vegetation/Animal Weather/Fire/Earthquake - 100% - 50% OLYMPIAD(12KV) - Customers: 1,003 158.4 1.0 1.6 27.9 0.1-4.7 0.0 1.0 1.0 9.0 0.1-9.0 0.1 1.0 3rd Party Equipment Failure 100% 98% 38% - - - 100% 100% - - 100% 100% - 100% 100% - Operation 0% 2% - 100% 100% - - - Other 100% - - - Vegetation/Animal - - 62% - Weather/Fire/Earthquake - 100% - 100% PAJARO(12KV) - Customers: 1,900 77.6 0.1-29.0 0.1-0.3 0.0 3.6 0.0 - - - 1.0 - - - 3.6 0.0 1.0 3rd Party Equipment Failure 100% 94% - 100% 100% - - - Operation 0% 6% 100% 100% 100% 100% - - - 100% 100% - Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% 17

Reliability Histories for Individual Circuits Serving Rancho Santa Margarita - 4 of 5 CircuitHistory 4 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI RANCH(12KV) - Customers: 1,549 12.7 0.1 192.8 1.0 17.3 0.1 - - - 1.0 - - - 17.3 0.1 1.0 3rd Party Equipment Failure 100% 100% 100% 100% 100% 100% - - - 100% 100% - Operation Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% RUSTIC(12KV) - Customers: 3,096 95.5 0.4 1.2 5.2 0.1 0.4 92.4 1.0 0.2 48.5 0.1 0.1 1.0 0.0 0.1 12.5 0.1 1.1 0.5 0.0-62.6 0.3 1.3 3rd Party 15% 55% 87% 60% 91% 94% 6% 2% 52% - - - 68% 56% - 66% 95% 1% - - - 14% 46% 1% Equipment Failure 40% 9% 6% 0% 0% - 94% 98% - 52% 93% 1% 0% 41% 46% - Operation 8% 12% - 7% 4% - - - Other 10% 5% 7% 32% 5% 6% - - 48% 48% 7% 100% 32% 44% 100% 0% 0% 11% 100% 100% - 38% 5% 23% Vegetation/Animal 3% 4% - - Weather/Fire/Earthquake 24% 15% - 32% 5% 88% - - - 6% 2% 76% SCOTCH(12KV) - Customers: 2,617 120.1 2.1-16.6 0.1-37.7 0.1-1.0-1.0 3rd Party 3% 2% - - Equipment Failure 45% 50% 84% 68% Operation 52% 47% - 100% 100% - 16% 32% Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% SHOOTER(12KV) - Customers: 1,251 80.0 1.0 252.5 3.0-1.0-1.0 3rd Party - - 26% 33% Equipment Failure 100% 100% 63% 34% Operation - - 11% 33% Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% 18

Reliability Histories for Individual Circuits Serving Rancho Santa Margarita - 5 of 5 CircuitHistory 5 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI WHISKEY(12KV) - Customers: 1,528 31.9 1.0-73.3 1.0-8.8 0.1-1.0 13.4 0.0-13.4 0.0 1.0 3rd Party Equipment Failure 97% 99% - 84% 98% - 70% 25% - - 100% 100% - 100% 100% - Operation 3% 1% - 16% 2% - 30% 75% Vegetation/Animal Weather/Fire/Earthquake - 100% - 100% 19