Circuit Reliability Review

Circuit Reliability Review San Jacinto 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 MENIFEE District CityList1 BOX SPRINGS MOUNTAIN EAST HEMET GOOD HOPE HEMET HOMELAND IDYLLWILD-PINE COVE JUNIPER FLATS LAKEVIEW MARCH AFB MEADOWBROOK MENIFEE MORENO VALLEY MOUNTAIN CENTER NUEVO PERRIS RIVERSIDE SAN JACINTO VALLE VISTA WINCHESTER WOODCREST SOBOBA BAND OF LUISENO INDIANS 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 San Jacinto CircuitList1 There are 19 circuits that serve San Jacinto 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers BISSELL(12KV) 1,175 - - - CHARLTON(12KV) 2,172 - - - DARTMOUTH(12KV) 1,331 - - - EASTER(12KV) 1,556 - - - ERIN(12KV) 1,832 - - - FRUITVALE(12KV) 1,647 - - - GILMAN(12KV) 16 - - - GIRARD(12KV) 1,829 - - - GREEN ACRES(12KV) 1,889 - - - HEWITT(12KV) 463 - - - KADICE(12KV) 1,620 - - - KIRBY(12KV) 1,596 - - - LAUDA(33KV) 1 - - - LOCKNER(12KV) 1,322 - - - MASSACRE(12KV) 1,603 - - - MINOR(12KV) 1,854 - - - SAVORY(12KV) 1,510 - - - STANFORD(12KV) 1,639 - - - STEEL(12KV) 30 - - - Grand Total 25,085 7

Reliability History of Circuits Serving San Jacinto (No Exclusions) BarChart 250.0 2014 2015 2016 2017 SAIDI (average minutes of sustained interruptions) 200.0 150.0 100.0 50.0 0.0 168.3 112.1 113.7 114.8 191.6 134.5 139.7 99.5 San Jacinto SAIFI (average frequency of sustained interruptions) MAIFI (average frequency of momentary interruptions) 2.5 2.0 1.5 1.0 0.5 0.0 3.0 2.5 2.0 1.5 1.0 0.5 0.0 2.0 2.8 1.0 0.8 0.9 1.4 1.4 0.9 1.4 1.8 1.1 1.6 1.0 1.2 1.2 1.8 SCE SYSTEMWIDE ** Exclusions are days which utilities are allowed to 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 San Jacinto 2017 SAIDIChart Vegetation /Animal 3.0% Weather /Fire /Earthquake 5.9% Other 3.1% Contributions to SAIDI 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 Operation 19.7% Equipment Failure 42.3% 3rd Party 26.1% 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 San Jacinto 2017 SAIFIChart Contributions to SAIFI by Outage Cause Vegetation /Animal 6.6% 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 11.0% Weather /Fire /Earthquake 9.0% Operation 30.7% 3rd Party 15.5% Equipment Failure 27.2% 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 San Jacinto Updated through Dec 2017

Average Reliability of 19 Circuits Serving San Jacinto 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 19 Circuits Serving San Jacinto -- Total Customers: 25,085 168.3 2.0 2.8 113.7 0.8 0.9 191.6 1.4 1.8 34.7 0.3 0.3 9.6 0.0 0.3 13.4 0.3 0.4 41.8 0.4 0.2 99.5 1.0 1.2 3rd Party 17% 15% 12% 19% 33% 25% 17% 19% 16% 1% 0% 1% 72% 65% 63% 25% 23% 25% 37% 19% - 26% 16% 25% Equipment Failure 35% 27% 14% 27% 24% 18% 14% 13% 13% 83% 49% - 3% 3% - 41% 20% 10% 18% 18% 35% 42% 27% 9% Operation 4% 7% 19% 41% 27% 13% 67% 60% 56% 1% 9% 19% 26% 32% 21% 31% 36% 12% 30% 42% - 20% 31% 14% Other 7% 22% 19% 10% 6% 23% 0% 0% 10% 7% 19% 80% - - 16% 3% 21% 17% 1% 0% 30% 3% 11% 34% Vegetation/Animal 0% 0% 6% 0% 0% - 1% 3% 2% 8% 23% 1% - - 0% - - - 0% 0% - 3% 7% 0% Weather/Fire/Earthquake 37% 29% 30% 3% 9% 21% 2% 5% 3% 36% 14% 21% 35% 6% 9% 17% 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 San Jacinto - 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 BISSELL(12KV) - Customers: 1,175 3.9 0.3 0.7 52.9 0.3-11.9 0.3 0.7 - - CircuitHistory - 3rd Party - - - 1 - Equipment Failure - - - 78% 41% - 84% 16% Operation 100% 100% 100% 22% 59% - 16% 84% 100% - - - Other Vegetation/Animal Weather/Fire/Earthquake CHARLTON(12KV) - Customers: 2,172 81.0 2.0 1.2 8.3 0.0-470.1 1.1 1.0 3.1 0.3 40.9 1.0 0.3 50.3 1.0-94.3 2.3 0.3 3rd Party Equipment Failure 81% 50% 19% 100% 98% - 6% 12% - - - 19% 4% 8% 2% - Operation 0% 1% - 0% 2% - 94% 88% 100% 100% 100% 81% 96% 100% - - - 38% 56% 100% Other 11% 49% - - Vegetation/Animal 8% 0% 81% - Weather/Fire/Earthquake - - 100% 100% - 53% 43% - DARTMOUTH(12KV) - Customers: 1,331 395.6 4.5 3.8 185.7 2.1 0.3 291.0 1.1 1.0 42.6 1.0 1.0 48.4 0.2 1.2 7.9 1.0 0.0 210.7 1.0-309.6 3.2 2.2 3rd Party 57% 35% 67% - - - 100% 100% - 68% 32% - Equipment Failure 3% 0% 12% 5% 4% 2% - - - 1% 0% - Operation 5% 12% - 8% 47% - 88% 95% 100% 0% 0% 100% 96% 98% 13% - - 100% - - - 15% 5% 54% Other 33% 52% 33% 72% 7% 100% - - - 98% 100% - - - 87% 100% 100% 16% 63% 46% Vegetation/Animal - 2% 0% - - 0% 0% - Weather/Fire/Earthquake 2% 0% - 21% 46% - - - EASTER(12KV) - Customers: 1,556 298.0 1.0 3.0 161.2 2.1 0.0 69.7 1.2 0.9 - - 0.0 2.5 0.0-10.1 0.0 1.0 0.9 0.0 1.0 13.5 0.0 2.0 3rd Party - - - 81% 49% - 61% 50% 48% - - - Equipment Failure 0% 0% 33% 4% 100% 100% 58% 50% - 22% 28% - Operation 0% 1% 33% 16% 50% - 6% 46% 48% - - 100% 100% - 42% 50% - 78% 72% - Other - - 67% - - 100% - - - 100% - - 100% - - 99% Vegetation/Animal 0% 0% - 3% 1% - - - 3% - - 100% - - - 1% Weather/Fire/Earthquake 100% 99% - - 15

Reliability Histories for Individual Circuits Serving San Jacinto - 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 ERIN(12KV) - Customers: 1,832 100.4 2.2 0.4 39.9 0.8 0.2 452.1 1.0 1.0 1.2 0.0 2.0 9.9 0.1 1.0 49.2 0.8 1.2 6.7 0.1-67.1 1.0 4.2 3rd Party - - - 87% 97% 100% 1% 2% 100% 100% 100% 92% 99% 100% - - - 83% 86% 52% Equipment Failure - - - 5% 1% - 0% 1% - - - 8% 1% 6% 1% - Operation - - - 3% 0% - 98% 95% 100% - 77% 95% - 8% 13% - Other 28% 58% - 5% 2% - - 100% - - 23% 5% - 2% 1% 48% Vegetation/Animal - - 0% 2% - 100% 100% - - 2% 0% - Weather/Fire/Earthquake 72% 42% 100% - FRUITVALE(12KV) - Customers: 1,647 25.5 0.2 1.0 31.8 0.7 1.0 12.3 0.2 2.2 70.7 1.1 9.9 0.1 0.2 170.0 1.1-250.5 2.2 0.2 3rd Party - - - 10% 36% - - - Equipment Failure 97% 54% 3% 0% - 40% 7% - - 11% 3% - Operation 3% 46% 100% 90% 64% - 97% 100% 100% - - 100% 100% 100% 100% 100% - 72% 52% 100% Other - 100% - - Vegetation/Animal - 60% 93% - - 17% 45% - Weather/Fire/Earthquake GILMAN(12KV) - Customers: 16 - - 2.0 69.8 0.5-70.0 5.0 5.0 99.0 1.0 1.0 - - - 117.0 1.0 - - - 1.0 216.0 2.0 2.0 3rd Party - - 26% 20% 20% - - 100% - - - 50% Equipment Failure 40% - - 100% 100% 54% 50% - Operation Other - - 100% 100% 100% - 66% 60% 40% 100% 100% - 100% 46% 50% 50% Vegetation/Animal - - 9% 20% Weather/Fire/Earthquake GIRARD(12KV) - Customers: 1,829 24.5 0.3 1.0 254.2 0.8 0.3 96.6 1.3 1.7 0.4 0.0 0.1 0.0-143.0 1.1 0.0 143.6 1.1 0.0 3rd Party 84% 98% 42% 30% - 42% 30% - Equipment Failure - - - 6% 12% - 51% 26% - 100% 100% - - - 58% 70% 100% 58% 69% 100% Operation 1% 1% 100% 84% 43% - - - 58% - - 100% 100% 0% 1% - Other 16% 1% - - - 100% - - Vegetation/Animal Weather/Fire/Earthquake - - - 10% 45% - 49% 74% 42% - - - 16

Reliability Histories for Individual Circuits Serving San Jacinto - 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 GREEN ACRES(12KV) - Customers: 1,889 523.8 5.5 8.2 111.9 1.0 0.3 116.2 1.7 3.6 1.8 0.0 1.0 80.3 0.1 1.0 17.9 0.0 - - - 1.0 99.9 0.2 3.0 3rd Party - - 42% 3% 16% 100% 100% - 100% 100% 100% - - 82% 78% 33% Equipment Failure 38% 59% 24% 100% 100% 100% 1% 0% 54% - - 95% 51% 17% 11% - Operation 0% 0% 47% 72% 15% - - 5% 49% 1% 11% - Other 0% 0% 12% 100% - - - 33% Vegetation/Animal - - 11% 25% 15% - - - Weather/Fire/Earthquake 62% 41% 64% - 100% - - 34% HEWITT(12KV) - Customers: 463 1.0-87.6 2.0-87.6 2.0-3rd Party Equipment Failure - - 91% 50% - 91% 50% - Operation 100% - 9% 50% - 9% 50% - Other Vegetation/Animal Weather/Fire/Earthquake KADICE(12KV) - Customers: 1,620 152.5 2.0 3.2 13.1 0.1 2.0 223.0 1.6 1.1 - - - 3rd Party Equipment Failure 91% 49% 37% 100% 100% - 7% 4% Operation 3% 2% 93% 96% 100% - - - Other 6% 49% 32% - - 50% - - Vegetation/Animal Weather/Fire/Earthquake 0% 0% 32% - - 50% - - KIRBY(12KV) - Customers: 1,596 239.3 3.2 6.0 99.9 0.8 2.4 481.0 3.5 5.7 0.1 0.0 - - - 2.0 46.9 0.7 1.4 0.2 0.0-47.1 0.7 3.4 3rd Party 65% 37% 66% 63% 56% - 50% 30% Equipment Failure 3% 0% - 33% 18% 0% 32% 19% 20% - - 100% 100% 28% - - - 99% 99% 11% Operation - - 17% 10% 3% 41% 2% 18% 7% 100% 100% - - - 50% - - 0% 0% 30% Other - - 50% 57% 79% 16% - - 17% - - - Vegetation/Animal Weather/Fire/Earthquake 33% 63% 34% - - 42% - - - 72% 100% 100% - 0% 1% 29% 17

Reliability Histories for Individual Circuits Serving San Jacinto - 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 LAUDA(33KV) - Customers: 1 107.0 1.0 4.0 19.0 1.0 1.0 615.0 6.0 4.0 129.0 1.0 1.0 - - 1.0 127.0 2.0 2.0 119.0 2.0 1.0 375.0 5.0 5.0 3rd Party - 100% 3% 17% 25% - - 100% - - - 20% Equipment Failure - - 25% - - - 28% 50% 50% - - 100% 100% 100% 95% 50% 100% 64% 60% 60% Operation - - - 100% 100% - - - Other 100% 100% 75% - - - 68% 17% 25% 100% 100% - - - 5% 50% - 36% 40% - Vegetation/Animal - - 1% 17% - - 100% 20% Weather/Fire/Earthquake LOCKNER(12KV) - Customers: 1,322 151.9 0.7 4.1 229.9 1.3 1.0 52.7 1.7 1.3 0.8 0.0 - - - 0.9 0.0-1.7 0.0-3rd Party 2% 1% 24% - - - 15% 1% Equipment Failure - - - 98% 98% - 76% 59% Operation 19% 62% 17% 1% 1% - 9% 41% 24% 100% 100% - - 48% 53% - Other - - - 0% 0% - - - 76% - 100% 100% - 52% 47% - Vegetation/Animal - - - 0% 0% - - - Weather/Fire/Earthquake 79% 37% 59% 1% 1% 100% - - MASSACRE(12KV) - Customers: 1,603 457.1 4.9 4.0 445.7 1.8 2.5 52.7 2.0 2.0 54.5 1.0 - - - 4.5 0.0-59.0 1.0-3rd Party - - - 22% 64% 22% - - - 2% 1% - - 2% 1% - Equipment Failure 84% 40% 50% 6% 20% 78% - - - 97% 99% - - 89% 96% - Operation 10% 19% 25% 73% 16% - 99% 100% 50% 1% 0% - - - 100% 100% - 8% 4% - Other 0% 0% - - 50% - - - Vegetation/Animal Weather/Fire/Earthquake 7% 41% 25% - - - 1% 0% MINOR(12KV) - Customers: 1,854 30.8 1.2 0.9 42.2 0.2-61.4 1.4 1.9 319.0 1.0 - - - 27.1 1.0 1.0 346.2 2.0 1.0 3rd Party 100% 100% - - Equipment Failure - - - 62% 50% - 66% 25% - 100% 100% - 100% 92% 50% 100% Operation - - 100% 38% 50% - 34% 75% 100% - 26% 97% - 2% 49% - Other Vegetation/Animal Weather/Fire/Earthquake - - 74% 3% - 6% 2% - 18

Reliability Histories for Individual Circuits Serving San Jacinto - 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 SAVORY(12KV) - Customers: 1,510 34.4 0.3 2.0 19.2 0.1 0.9 130.8 1.6 1.2 0.1 0.0 0.2 0.0 0.2 2.0 0.0-2.3 0.0 0.2 3rd Party 8% 14% 48% - - - 73% 78% 8% - - - Equipment Failure - - - 7% 2% - 5% 6% 6% - - 67% 33% 100% - - - 6% 6% 100% Operation 29% 46% 49% 92% 97% 100% 22% 16% 86% 100% 100% 33% 67% - 5% 15% - 11% 33% - Other 63% 40% 84% 69% - 73% 50% - Vegetation/Animal - - 3% 1% 1% - 11% 15% - 10% 11% - Weather/Fire/Earthquake STANFORD(12KV) - Customers: 1,639 63.0 1.6 2.4 98.9 1.2 2.4 248.4 1.0 1.0 - - 0.6 0.0 1.0 - - - 0.6 0.0 1.0 3rd Party 61% 40% 58% 65% 87% 100% - - Equipment Failure - - - 100% 100% 100% 100% - Operation 13% 4% - 35% 13% - 100% 100% 100% - - - Other 24% 55% - - Vegetation/Animal 2% 0% 42% - Weather/Fire/Earthquake - 100% - 100% STEEL(12KV) - Customers: 30 392.3 2.9 7.8 112.5 2.1 1.0 237.0 5.9 5.0 99.0 1.0 2.1 112.7 1.0-109.2 0.9 - - - 1.0 320.9 3.0 3.1 3rd Party 18% 35% - 90% 49% 100% 7% 16% 19% - - 48% 92% 97% - - - 32% 34% 33% Equipment Failure 77% 63% 24% - - - 71% 17% 42% - - 100% 100% 34% 31% - Operation - - - 4% 2% - - - 8% 3% - - - 3% 1% - Other - - 37% 6% 49% - 19% 49% 39% 100% 100% 48% 100% 31% 34% 65% Vegetation/Animal 4% 2% 39% - - - 3% 17% - - - 3% - - - 2% Weather/Fire/Earthquake - - - - - - - 19