Circuit Reliability Review

Circuit Reliability Review San Bernardino District 4 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 REDLANDS District CityList1 BANNING BEAUMONT BOX SPRINGS MOUNTAIN CALIMESA CHERRY VALLEY COLTON GRAND TERRACE HIGHGROVE HIGHLAND LOMA LINDA MENTONE MUSCOY REDLANDS RIALTO RIVERSIDE YUCAIPA CITY OF SAN BERNARDINO SAN MANUEL BAND OF MISSION 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 Bernardino District 4 CircuitList1 There are 21 circuits that serve San Bernardino District 4 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers ALICIA(12KV) 2,007 - - - ATLAS(12KV) 2,340 - - - AVERY(12KV) 2,602 - - - BANDERA(12KV) 1,447 - - - CABLE(12KV) 2,035 - - - CLUTCH(12KV) 1,794 - - - CONGO(12KV) 1,822 - - - DESSAU(12KV) 1,636 - - - FORTRESS(12KV) 2,415 - - - GAYLORD(12KV) 2,129 - - - HAZEL(12KV) 925 - - - KADOTA(12KV) 2,798 - - - MARBUCK(12KV) 2,344 - - - OTTER(12KV) 2,503 - - - PATE(12KV) 2,367 - - - POMALL(12KV) 2,155 - - - SAMPRAS(12KV) 90 - - - TELEPHONE(12KV) 1,719 - - - THOR(12KV) 1,843 - - - TILE(12KV) 1,926 - - - TITUS(12KV) 1,256 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Grand Total 40,153 7

Reliability History of Circuits Serving San Bernardino District 4 (No Exclusions) BarChart SAIDI (average minutes of sustained interruptions) 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 0.0 2014 2015 2016 2017 134.5 139.7 112.1 109.0 114.8 105.6 90.9 71.3 San Bernardino District 4 SAIFI (average frequency of sustained interruptions) MAIFI (average frequency of momentary interruptions) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 2.0 1.5 1.0 0.5 0.0 1.2 1.1 1.0 0.9 1.4 1.4 1.0 1.0 1.4 1.5 1.1 1.6 0.9 1.6 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 Bernardino District 4 2017 SAIDIChart Contributions to SAIDI by Outage Cause Vegetation /Animal 0.0% Other 0.7% 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 17.7% Weather /Fire /Earthquake 20.6% 3rd Party 28.3% Equipment Failure 32.7% 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 Bernardino District 4 2017 SAIFIChart Contributions to SAIFI by Outage Cause Vegetation /Animal 0.0% 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 5.4% Weather /Fire /Earthquake 20.1% Operation 23.1% 3rd Party 28.3% Equipment Failure 23.2% 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 Bernardino District 4 Updated through Dec 2017

Average Reliability of 21 Circuits Serving San Bernardino District 4 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 21 Circuits Serving San Bernardino District 4 -- Total Customers: 40,153 90.9 1.1 1.0 109.0 1.2 1.0 105.6 1.4 1.5 16.8 0.3 0.7 12.3 0.1 0.5 20.0 0.2 0.2 22.2 0.3 0.3 71.3 0.9 1.6 3rd Party 24% 26% 23% 14% 19% 41% 25% 25% 36% 15% 15% 16% 51% 53% 22% 42% 53% 26% 13% 13% 37% 28% 28% 23% Equipment Failure 35% 29% 23% 50% 36% 18% 41% 34% 20% 67% 57% 24% 32% 6% 14% 25% 6% - 14% 14% 23% 33% 23% 18% Operation 11% 11% 6% 17% 28% 2% 11% 15% 4% 2% 1% - 11% 40% 5% 10% 25% - 40% 32% - 18% 23% 2% Other 14% 16% 21% 4% 5% 10% 0% 0% 21% 2% 19% 34% - - 12% - - 36% 1% 0% 22% 1% 5% 25% Vegetation/Animal 5% 6% 21% 8% 5% 8% 3% 2% 13% - - 9% 0% 0% 47% - - - 0% 0% 16% 0% 0% 21% Weather/Fire/Earthquake 10% 11% 6% 7% 6% 20% 19% 24% 7% 13% 7% 18% 5% 0% - 23% 15% 38% 33% 40% 1% 21% 20% 11% 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 Bernardino District 4-1 of 6 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 ALICIA(12KV) - Customers: 2,007 30.6 0.2 2.0 108.7 0.7 0.7 54.9 2.6 2.5 - - CircuitHistory - 16.9 1.0-96.4 0.8-0.2 0.0-113.5 1.9-3rd Party - - - 100% 100% - - - - - - 1- - - - 90% 96% - - - - 76% 43% - Equipment Failure 100% 100% - - - - 46% 2% - - - - - - - 10% 4% - - - - 8% 2% - Operation - - - - - - 41% 98% - - - - 100% 100% - - - - - - - 15% 56% - Other - - 50% - - - - - 51% - - - - - - - - - - - - - - - Vegetation/Animal - - 50% - - 100% - - - - - - - - - - - - 100% 100% - 0% 0% - Weather/Fire/Earthquake - - - - - - 12% 0% 49% - - - - - - - - - - - - - - - ATLAS(12KV) - Customers: 2,340 9.6 0.1-421.2 5.8 2.0 145.2 2.2 1.9 9.7 0.0-0.3 0.0 - - - - 121.4 2.0-131.4 2.0-3rd Party 6% 2% - - - - - - 53% - - - - - - - - - 3% 1% - 3% 1% - Equipment Failure - - - 45% 48% 50% 3% 0% - 100% 100% - - - - - - - - - - 7% 1% - Operation 15% 16% - 6% 18% - 51% 8% 47% - - - 100% 100% - - - - - - - 0% 0% - Other - - - 15% 17% 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - 34% 17% - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 79% 81% - - - - 46% 91% - - - - - - - - - - 97% 99% - 89% 97% - AVERY(12KV) - Customers: 2,602 - - 2.0 3.0 0.0 1.0 79.5 1.1 2.9 - - 1.0 32.1 0.1 1.0 0.6 0.0-75.6 0.4-108.3 0.5 2.0 3rd Party - - - - - - 1% 1% 34% - - - - - - - - - 0% 0% - 0% 0% - Equipment Failure - - - 100% 100% - 1% 0% - - - - 100% 100% 100% - - - - - - 30% 14% 50% Operation - - 50% - - - 11% 6% - - - - - - - 100% 100% - 100% 100% - 70% 85% - Other - - - - - - - - - - - 100% - - - - - - - - - - - 50% Vegetation/Animal - - 50% - - 100% - - 34% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 87% 93% 32% - - - - - - - - - - - - - - - BANDERA(12KV) - Customers: 1,447 49.3 1.0-59.2 1.4 1.0 205.0 2.0 2.0 - - - - - - 1.0 0.0 - - - - 1.0 0.0-3rd Party 80% 99% - - - 100% 70% 93% 50% - - - - - - - - - - - - - - - Equipment Failure 20% 1% - - - - 28% 6% - - - - - - - 100% 100% - - - - 100% 100% - Operation - - - 100% 100% - 2% 1% - - - - - - - - - - - - - - - - Other - - - - - - - - 50% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - 15

Reliability Histories for Individual Circuits Serving San Bernardino District 4-2 of 6 CircuitHistory 2 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 CABLE(12KV) - Customers: 2,035 130.6 1.1-173.7 2.1 1.0 143.4 1.1 1.6 5.9 1.0-13.1 0.0 3.0 0.1 0.0-3.4 0.0 1.0 22.6 1.0 4.0 3rd Party - - - - - 100% - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - 98% 96% - 57% 94% 100% - - - 100% 100% - - - - 100% 100% - 73% 4% - Operation - - - 1% 2% 0% 41% 5% - - - - - - - 100% 100% - - - - 0% 0% - Other - - - - - - - - - 100% 100% - - - - - - - - - - 26% 96% - Vegetation/Animal - - - 1% 1% - 1% 2% - - - - - - 100% - - - - - 100% - - 100% Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - CLUTCH(12KV) - Customers: 1,794 360.3 4.1 1.4 131.4 0.9 2.9 30.3 0.6 2.0 - - 1.0 13.1 0.0 0.6 - - - 8.5 0.0 0.6 21.6 0.0 2.1 3rd Party 32% 24% 32% - - - - - 50% - - - - - - - - - - - - - - - Equipment Failure 9% 2% 68% 99% 95% 65% 53% 3% - - - - - - - - - - 73% 48% 100% 29% 31% 26% Operation 16% 25% - 1% 5% - 36% 94% - - - - - - 100% - - - - - - - - 27% Other 20% 25% - - - 35% 11% 3% - - - 100% - - - - - - - - - - - 47% Vegetation/Animal - - - - - - - - 50% - - - - - - - - - - - - - - - Weather/Fire/Earthquake 22% 25% - - - - - - - - - - 100% 100% - - - - 27% 52% - 71% 69% - CONGO(12KV) - Customers: 1,822 20.4 0.0 1.0 24.2 0.4 2.0 10.2 0.1 1.0 - - - - - - 7.6 0.0-38.4 2.0 1.0 46.0 2.0 1.0 3rd Party - - 100% - - 100% - - - - - - - - - - - - - - - - - - Equipment Failure 85% 88% - 30% 5% - - - - - - - - - - 100% 100% - 63% 50% 100% 69% 51% 100% Operation 15% 12% - 70% 95% - 100% 100% - - - - - - - - - - 37% 50% - 31% 49% - Other - - - - - - - - 100% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - DESSAU(12KV) - Customers: 1,636 112.4 1.1-126.3 2.1 2.0 157.6 2.0-19.8 0.1 0.9 - - - - - - 36.2 1.0 0.2 55.9 1.0 1.1 3rd Party 68% 93% - - - - 49% 50% - - - - - - - - - - 76% 98% 100% 49% 90% 18% Equipment Failure 25% 5% - 12% 3% - - - - 100% 100% - - - - - - - 24% 2% - 51% 10% - Operation 7% 2% - 24% 45% 4% 1% 0% - - - - - - - - - - - - - - - - Other - - - - - - - - - - - 100% - - - - - - - - - - - 82% Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 64% 52% 96% 50% 50% - - - - - - - - - - - - - - - - 16

Reliability Histories for Individual Circuits Serving San Bernardino District 4-3 of 6 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 FORTRESS(12KV) - Customers: 2,415 276.1 5.3 2.9 107.4 1.4 1.0 22.2 0.3 0.9 8.5 0.0 1.0 5.9 0.0-2.1 0.0-48.7 0.6-65.1 0.7 1.0 3rd Party 29% 34% 29% 90% 95% 71% 47% 48% - 58% 14% - - - - - - - - - - 8% 1% - Equipment Failure 22% 39% 35% 0% 0% - 21% 1% 100% 22% 34% 100% - - - 2% 2% - - - - 3% 1% 100% Operation 0% 0% - 6% 5% 29% - - - 20% 52% - 100% 100% - 98% 98% - 94% 99% - 85% 97% - Other 42% 19% 29% 4% 0% - - - - - - - - - - - - - 6% 1% - 5% 1% - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 6% 7% 7% - - - 32% 50% - - - - - - - - - - - - - - - - GAYLORD(12KV) - Customers: 2,129 - - - - - - 57.2 1.4 - - - - - - - 12.1 0.0 - - - - 12.1 0.0-3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 93% 73% - - - - - - - 100% 100% - - - - 100% 100% - Operation - - - - - - 7% 27% - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - HAZEL(12KV) - Customers: 925 304.3 1.2 0.5 192.4 1.3 0.7 - - - 98.3 0.8-4.2 0.0-72.1 0.2-60.7 1.1-235.4 2.1-3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% 100% 50% 17% - - - - - - - - - - 98% 61% - 72% 7% - 49% 8% - Operation - - - 2% 7% - - - - - - - 76% 77% - 2% 39% - - - - 2% 4% - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - 24% 23% - - - - - - - 0% 0% - Weather/Fire/Earthquake - - - 48% 76% 100% - - - 100% 100% - - - - - - - 28% 93% - 49% 87% - KADOTA(12KV) - Customers: 2,798 73.7 1.1-66.7 1.1 1.3 238.5 2.8 3.7 143.2 1.4 1.7 8.2 0.0 1.0 68.6 1.0 - - - 1.0 220.0 2.5 3.7 3rd Party - - - 84% 94% 100% 40% 72% 53% 7% 5% - - - - 88% 97% - - - - 32% 44% - Equipment Failure 3% 0% - 3% 1% - 55% 27% 21% 93% 95% 40% 100% 100% - 12% 3% - - - - 68% 56% 18% Operation 88% 91% - - - - 4% 1% - 1% 0% - - - - - - - - - - 0% 0% - Other 9% 9% - 10% 3% - - - 27% - - 60% - - - - - - - - 100% - - 55% Vegetation/Animal - - - 3% 2% - - - - - - - - - 100% - - - - - - - - 27% Weather/Fire/Earthquake - - - - - - 0% 0% - - - - - - - - - - - - - - - - 17

Reliability Histories for Individual Circuits Serving San Bernardino District 4-4 of 6 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 MARBUCK(12KV) - Customers: 2,344 - - - 128.8 1.2 1.9 110.8 1.3 0.2 2.8 0.0 2.0 - - 1.0 0.2 0.0 1.0 1.7 0.0-4.6 0.0 4.0 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 21% 14% 100% - - - - - - 100% 100% - 100% 100% - 40% 8% - Operation - - - 71% 95% - 0% 1% - 100% 100% - - - - - - - - - - 60% 92% - Other - - - - - - - - - - - - - - 100% - - 100% - - - - - 50% Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 29% 5% 100% 79% 86% - - - 100% - - - - - - - - - - - 50% OTTER(12KV) - Customers: 2,503 6.1 0.0 1.9 31.0 1.0 1.0 50.1 0.4 1.0 - - - 2.0 0.0-73.0 0.5 1.0 - - - 75.0 0.5 1.0 3rd Party 100% 100% 52% 84% 99% 100% 11% 2% 100% - - - - - - - - - - - - - - - Equipment Failure - - - 16% 1% - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - 100% 100% - - - - - - - 3% 2% - Other - - 48% - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - 76% 95% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 13% 2% - - - - - - - 100% 100% 100% - - - 97% 98% 100% PATE(12KV) - Customers: 2,367 80.4 1.1-187.1 1.1 0.7 33.7 0.6 1.4 - - 1.0 86.6 1.0-28.8 0.0-1.1 0.0-116.5 1.0 1.0 3rd Party - - - 6% 2% - - - 70% - - - 100% 100% - - - - - - - 74% 96% - Equipment Failure - - - 89% 93% 100% 85% 90% 30% - - - - - - 48% 54% - - - - 12% 2% - Operation 4% 1% - 5% 4% - - - - - - - 0% 0% - 52% 46% - 100% 100% - 14% 3% - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal 96% 99% - 0% 0% - 15% 10% - - - 100% - - - - - - - - - - - 100% Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - POMALL(12KV) - Customers: 2,155 86.6 0.7 1.4 4.5 0.0-76.6 2.0-30.2 0.6 2.0 1.1 0.0-0.7 0.0 - - - 2.0 31.9 0.7 4.0 3rd Party - - - - - - - - - 100% 100% 100% - - - - - - - - 100% 94% 97% 100% Equipment Failure 11% 1% - 92% 76% - 100% 100% - - - - 100% 100% - 100% 100% - - - - 6% 3% - Operation 42% 6% - 8% 24% - - - - - - - - - - - - - - - - - - - Other - - 73% - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 48% 92% 27% - - - - - - - - - - - - - - - - - - - - - 18

Reliability Histories for Individual Circuits Serving San Bernardino District 4-5 of 6 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 SAMPRAS(12KV) - Customers: 90 - - - - - - 19.1 1.0 1.0 - - - 119.6 1.0 - - - - - - 2.0 119.6 1.0 2.0 3rd Party - - - - - - 100% 100% 100% - - - 100% 100% - - - - - - - 100% 100% - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - 100% - - 100% TELEPHONE(12KV) - Customers: 1,719 125.9 0.9 0.2 48.6 0.1-100.4 0.9 1.0 - - - 19.0 0.2 1.8 - - 1.0 - - - 19.0 0.2 2.8 3rd Party - - - - - - 52% 86% 100% - - - 100% 100% 100% - - 100% - - - 100% 100% 100% Equipment Failure 97% 96% 100% 97% 80% - 40% 5% - - - - - - - - - - - - - - - - Operation 1% 2% - 3% 20% - 3% 5% - - - - - - - - - - - - - - - - Other 2% 2% - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - 6% 4% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - THOR(12KV) - Customers: 1,843 36.5 0.2 1.0 130.7 1.8-2.4 0.0 - - - - - - - 19.0 1.0 - - - - 19.0 1.0-3rd Party 57% 14% 100% - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 8% 14% - 100% 100% - 100% 100% - - - - - - - 100% 100% - - - - 100% 100% - Other 35% 72% - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - TILE(12KV) - Customers: 1,926 28.4 1.1 3.2 0.3 0.0 1.0 391.2 4.0 4.1 10.9 1.0 1.0 - - - 3.0 0.0-29.6 0.1-43.5 1.1 1.0 3rd Party - - - - - 100% 43% 33% 17% - - - - - - - - - 100% 100% - 68% 6% - Equipment Failure 75% 8% 29% - - - 55% 64% 35% 100% 100% 100% - - - - - - - - - 25% 93% 100% Operation - - - 100% 100% - 3% 3% - - - - - - - 100% 100% - - - - 7% 1% - Other 25% 92% - - - - - - 24% - - - - - - - - - - - - - - - Vegetation/Animal - - 71% - - - - - 24% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - - 19

Reliability Histories for Individual Circuits Serving San Bernardino District 4-6 of 6 CircuitHistory 6 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 TITUS(12KV) - Customers: 1,256 339.1 2.2 2.7 375.3 1.6-183.1 3.0 3.0 - - - 24.8 0.1 0.9 15.4 0.1-14.8 0.1-55.0 0.3 0.9 3rd Party 49% 46% - - - - - - - - - - 18% 73% 100% - - - - - - 8% 34% 100% Equipment Failure 32% 47% 65% 100% 100% - 52% 34% - - - - 82% 27% - 100% 100% - - - - 65% 36% - Operation - - - - - - 5% 33% - - - - - - - - - - 100% 100% - 27% 31% - Other - - - - - - - - 67% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 33% - - - - - - - - - - - - - - - Weather/Fire/Earthquake 19% 7% 35% - - - 42% 33% - - - - - - - - - - - - - - - - 20