Circuit Reliability Review

Circuit Reliability Review La Habra 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 FULLERTON District CityList1 ANAHEIM BREA BUENA PARK CYPRESS EAST LA MIRADA FULLERTON HACIENDA HEIGHTS LA HABRA LA HABRA HEIGHTS LA MIRADA LA PALMA PLACENTIA ROWLAND HEIGHTS STANTON YORBA LINDA 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 La Habra CircuitList1 There are 28 circuits that serve La Habra 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers BRIDE(12KV) 474 - - - CAROB(12KV) 2,753 - - - COLFAX(12KV) 2,311 - - - DEODARA(12KV) 507 - - - DITWOOD(12KV) 1 - - - DRILLER(12KV) 1,739 - - - FONDA(12KV) 2,391 - - - GASTON(12KV) 1,759 - - - GRACE(12KV) 1,509 - - - GUM(12KV) 2,996 - - - GUSHER(12KV) 1,048 - - - HACKBERRY(12KV) 2,032 - - - HAVENHURST(12KV) 982 - - - IDAHO(12KV) 2,481 - - - MEMORY(12KV) 902 - - - OMEGA(12KV) 1,741 - - - PEABUSH(12KV) 44 - - - PENMAR(12KV) 1,328 - - - PHOENIX(12KV) 1,172 - - - PIPELINE(12KV) 1,648 - - - PRIVET(12KV) 1,979 - - - PRUNE(12KV) 2,141 - - - PYRUS(12KV) 1,484 - - - RICKO(12KV) 2,862 - - - RONWOOD(12KV) 235 - - - TONNER(12KV) 1,685 - - - TWISTER(12KV) 1,733 - - - WHIPSTOCK(12KV) 908 - - - - - - - - - - - Grand Total 42,845 7

Reliability History of Circuits Serving La Habra (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 75.4 112.1 114.8 52.6 60.7 134.5 139.7 104.4 La Habra 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 0.9 0.5 0.5 1.1 0.7 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 0.9 1.4 1.4 0.6 1.6 1.0 1.0 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 0.0 8

Causes of Repair Outages in La Habra 2017 SAIDIChart 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 Vegetation /Animal 9.4% Other 0.8% Weather /Fire /Earthquake 21.0% Operation 8.7% 3rd Party 19.7% Equipment Failure 40.4% 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 La Habra 2017 SAIFIChart 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 1.1% Vegetation /Animal 13.0% Operation 8.4% Weather /Fire /Earthquake 17.3% 3rd Party 18.2% Equipment Failure 42.0% 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 La Habra Updated through Dec 2017

Average Reliability of 28 Circuits Serving La Habra 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 28 Circuits Serving La Habra -- Total Customers: 42,845 75.4 0.6 0.9 52.6 0.5 0.6 60.7 0.5 1.0 41.3 0.3 0.4 14.7 0.1 0.2 30.8 0.2 0.2 17.6 0.1 0.3 104.4 0.7 1.0 3rd Party 7% 8% 24% 34% 36% 42% 7% 22% 35% 1% 0% 22% 49% 59% 64% 41% 29% 42% 1% 1% - 20% 18% 26% Equipment Failure 52% 50% 8% 39% 36% 27% 52% 42% 6% 37% 37% 16% 1% 3% - 48% 61% 58% 69% 61% 30% 40% 42% 25% Operation 18% 14% 15% 22% 24% 11% 5% 6% - 3% 3% - 37% 24% - 3% 6% - 9% 9% 6% 9% 8% 2% Other 8% 7% 10% 0% 0% 14% 11% 10% 19% - - 5% 6% 6% - - - - - - - 1% 1% 2% Vegetation/Animal 1% 1% 25% 5% 4% 6% 5% 8% 31% 8% 15% 10% 3% 4% - 7% 4% - 21% 29% 46% 9% 13% 17% Weather/Fire/Earthquake 15% 20% 17% 0% 0% - 20% 12% 9% 51% 45% 46% 4% 4% 36% 1% 1% - - - 17% 21% 17% 28% 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 La Habra - 1 of 7 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 BRIDE(12KV) - Customers: 474 237.7 0.2-162.7 0.5 - - - 1.0 92.9 1.0 CircuitHistory - - - - - - - - - - 92.9 1.0-3rd Party - - - - - - - - 100% - - 1- - - - - - - - - - - - - Equipment Failure - - - 66% 83% - - - - - - - - - - - - - - - - - - - Operation 100% 100% - 34% 17% - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - 100% 100% - - - - - - - - - - 100% 100% - CAROB(12KV) - Customers: 2,753 8.6 0.0-6.0 0.0 1.0 7.3 0.1-6.7 0.0 1.0 - - - 1.9 0.0-2.6 0.0-11.2 0.0 1.0 3rd Party - - - 16% 15% 100% 100% 100% - 100% 100% 100% - - - - - - 71% 81% - 76% 79% 100% Equipment Failure 27% 7% - - - - - - - - - - - - - 100% 100% - - - - 17% 8% - Operation 73% 93% - 84% 85% - - - - - - - - - - - - - 29% 19% - 7% 13% - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - COLFAX(12KV) - Customers: 2,311 30.1 0.1 - - - - 75.3 0.6 1.5 4.2 0.0-5.4 0.0 - - - - - - - 9.6 0.0-3rd Party - - - - - - - - 68% - - - - - - - - - - - - - - - Equipment Failure 100% 100% - - - - 11% 4% - - - - - - - - - - - - - - - - Operation - - - - - - 0% 1% - 100% 100% - 100% 100% - - - - - - - 100% 100% - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 88% 95% 32% - - - - - - - - - - - - - - - DEODARA(12KV) - Customers: 507 19.3 0.0-9.7 1.0-6.4 0.0 - - - - - - - - - - - - - - - - 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - - - - - - - - - - - - - - - - - - - - - - Operation - - - 100% 100% - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - 100% 100% - - - - - - - - - - - - - - - - 15

Reliability Histories for Individual Circuits Serving La Habra - 2 of 7 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 DITWOOD(12KV) - Customers: 1 - - - - - - - - - - - - - - - - - - - - - - - - 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - DRILLER(12KV) - Customers: 1,739 214.8 2.4 1.0 71.9 1.0-207.3 2.1 1.0 - - - - - - - - - 87.1 1.0-87.1 1.0-3rd Party - - - 79% 96% - - - 100% - - - - - - - - - - - - - - - Equipment Failure 49% 42% - 11% 1% - 48% 48% - - - - - - - - - - - - - - - - Operation 46% 57% - 10% 2% - 0% 1% - - - - - - - - - - - - - - - - Other 5% 2% 100% - - - 47% 47% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - 5% 4% - - - - - - - - - - 100% 100% - 100% 100% - FONDA(12KV) - Customers: 2,391 82.9 0.7 3.3 117.7 0.8 4.2 7.8 0.0 1.0 68.1 0.7-3.7 0.0 1.0 0.4 0.0 1.0 0.5 0.0-72.7 0.7 2.0 3rd Party - - - 96% 98% 52% - - - - - - - - - - - 100% - - - - - 50% Equipment Failure 93% 99% 10% 0% 0% 24% 70% 24% - - - - - - - 100% 100% - - - - 1% 0% - Operation 7% 1% 60% 3% 1% 24% 30% 76% - - - - 21% 43% - - - - 100% 100% - 2% 2% - Other - - 30% - - - - - 100% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - 100% 100% - 79% 57% 100% - - - - - - 98% 98% 50% GASTON(12KV) - Customers: 1,759 27.2 0.1-20.6 0.5 0.5 128.6 1.3 1.0 85.5 1.0 1.0 4.4 0.0-0.5 0.0-166.5 0.7 2.0 257.0 1.7 3.0 3rd Party - - - 93% 95% 100% 21% 76% 100% - - - - - - - - - - - - - - - Equipment Failure 3% 0% - - - - 1% 0% - - - - - - - - - - 99% 96% 51% 64% 38% 34% Operation 12% 25% - 7% 5% - 4% 1% - 1% 1% - - - - 100% 100% - 0% 0% - 1% 1% - Other 85% 75% - - - - 45% 7% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - 99% 99% 100% 100% 100% - - - - 1% 4% - 35% 61% 33% Weather/Fire/Earthquake - - - - - - 29% 16% - - - - - - - - - - - - 49% - - 33% 16

Reliability Histories for Individual Circuits Serving La Habra - 3 of 7 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 GRACE(12KV) - Customers: 1,509 18.2 0.1 0.9 6.5 0.1-102.2 1.6 3.0 113.1 1.0 0.9 6.3 0.0-59.2 0.7 0.5 - - - 178.7 1.8 1.4 3rd Party - - - - - - - - 35% - - - - - - - - - - - - - - - Equipment Failure - - - - - - 53% 68% - - - - - - - 88% 92% 100% - - - 29% 37% 33% Operation - - - - - - 47% 32% - - - - 76% 76% - 0% 0% - - - - 3% 2% - Vegetation/Animal - - - 100% 100% - - - 32% - - - 24% 24% - 2% 3% - - - - 2% 2% - Weather/Fire/Earthquake 100% 100% 100% - - - - - 32% 100% 100% 100% - - - 10% 5% - - - - 66% 59% 67% GUM(12KV) - Customers: 2,996 200.0 1.6 1.7 0.4 0.0 1.0 2.1 0.0 2.0 103.5 0.6 0.9 2.5 0.1-214.5 0.9-8.9 0.1-329.5 1.6 0.9 3rd Party - - - - - - - - 50% - - - - - - 88% 95% - - - - 57% 52% - Equipment Failure 32% 39% 25% - - - 100% 100% - 100% 100% 100% 100% 100% - 11% 4% - 100% 100% - 42% 47% 100% Operation 18% 6% 1% 100% 100% - - - - - - - - - - 1% 1% - - - - 1% 1% - Other - - - - - 100% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 50% - - - - - - - - - - - - - - - Weather/Fire/Earthquake 50% 55% 74% - - - - - - - - - - - - - - - - - - - - - GUSHER(12KV) - Customers: 1,048 110.5 1.0-207.1 2.0 1.9 202.5 1.1-157.6 0.2 - - - - 37.1 0.2 - - - - 194.8 0.3-3rd Party - - - 25% 50% 53% - - - - - - - - - - - - - - - - - - Equipment Failure 96% 98% - 75% 50% 47% 99% 99% - - - - - - - - - - - - - - - - Operation 4% 2% - - - - 1% 1% - - - - - - - 30% 44% - - - - 6% 25% - Vegetation/Animal - - - - - - - - - - - - - - - 70% 56% - - - - 13% 31% - Weather/Fire/Earthquake - - - - - - - - - 100% 100% - - - - - - - - - - 81% 45% - HACKBERRY(12KV) - Customers: 2,032 58.6 0.4 2.0 21.8 1.1-51.9 1.0 1.0 65.7 1.2 1.0 2.3 0.0-1.1 0.0 - - - 0.2 69.1 1.3 1.2 3rd Party 10% 4% 100% 18% 7% - 77% 96% - - - 56% - - - - - - - - - - - 47% Equipment Failure 0% 1% - - - - 20% 2% - 57% 84% - - - - - - - - - - 54% 82% - Operation 0% 1% - 82% 93% - - - - 0% 0% - - - - 100% 100% - - - - 2% 1% - Other 70% 68% - - - - - - 100% - - 44% 100% 100% - - - - - - - 3% 1% 37% Vegetation/Animal 19% 27% - - - - 0% 0% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 3% 3% - 43% 16% - - - - - - - - - 100% 40% 15% 16% 17

Reliability Histories for Individual Circuits Serving La Habra - 4 of 7 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 HAVENHURST(12KV) - Customers: 982 - - - 11.7 0.1 0.9 78.4 1.0 1.0 - - - 39.4 0.8 - - - 1.0 - - - 39.4 0.8 1.0 3rd Party - - - - - - - - - - - - - - - - - 100% - - - - - 100% Equipment Failure - - - - - - 100% 100% 100% - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - 100% 100% - - - - - - - 100% 100% - Vegetation/Animal - - - 100% 100% 100% - - - - - - - - - - - - - - - - - - IDAHO(12KV) - Customers: 2,481 - - - 26.1 0.1-27.9 0.3 2.6 12.8 0.0-105.4 1.1-0.2 0.0 - - - 1.0 118.4 1.1 1.0 3rd Party - - - - - - 6% 7% - - - - 42% 90% - - - - - - - 37% 88% - Equipment Failure - - - 100% 100% - 88% 91% 24% 100% 100% - - - - 100% 100% - - - - 11% 2% - Operation - - - - - - 1% 0% - - - - 58% 10% - - - - - - - 52% 10% - Vegetation/Animal - - - - - - 6% 2% 76% - - - - - - - - - - - 100% - - 100% MEMORY(12KV) - Customers: 902 - - 1.0 10.0 0.1-304.2 1.0 2.8 105.8 0.2 1.8 - - - 5.5 0.0 - - - - 111.3 0.2 1.8 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - 100% - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - 63% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - 100% 100% - - - - 5% 12% - Weather/Fire/Earthquake - - - 100% 100% - 100% 100% 37% 100% 100% 100% - - - - - - - - - 95% 88% 100% OMEGA(12KV) - Customers: 1,741 75.0 0.4 0.1 20.6 0.1 0.1 22.3 0.2 0.1 4.2 0.1 1.0 34.4 0.3-1.1 0.0-0.8 0.0-40.5 0.4 1.0 3rd Party 71% 75% - - - - - - - - - - 100% 100% - - - - - - - 85% 84% - Equipment Failure - - - 29% 8% - 10% 1% - 12% 13% - - - - 88% 44% - 100% 100% - 6% 3% - Operation 14% 14% - 61% 85% - 9% 5% - - - - - - - 12% 56% - - - - 0% 1% - Other 14% 11% - 4% 2% 100% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - 6% 5% - 8% 10% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 0% 0% 100% - - - 73% 84% 100% 88% 87% 100% - - - - - - - - - 9% 12% 100% 18

Reliability Histories for Individual Circuits Serving La Habra - 5 of 7 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 PEABUSH(12KV) - Customers: 44 - - - - - - - - - - - - - - - - - - - - - - - - 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - PENMAR(12KV) - Customers: 1,328 23.3 0.1 1.0 2.9 0.0 - - - - 2.3 0.0 - - - - 0.5 0.0-1.0 0.0 1.0 3.8 0.0 1.0 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - 62% 52% - - - - - - - - - - - - - - - - - - - Operation 100% 100% - - - - - - - 100% 100% - - - - - - - 100% 100% - 87% 91% - Vegetation/Animal - - 100% - - - - - - - - - - - - - - - - - 100% - - 100% Weather/Fire/Earthquake - - - 38% 48% - - - - - - - - - - 100% 100% - - - - 13% 9% - PHOENIX(12KV) - Customers: 1,172 - - - 17.7 0.1-110.0 0.3-26.0 0.0 - - - - 1.9 0.1 - - - - 28.0 0.1-3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - 81% 77% - 90% 72% - - - - - - - 100% 100% - - - - 7% 61% - Operation - - - 19% 23% - 2% 3% - 100% 100% - - - - - - - - - - 93% 39% - Other - - - - - - 8% 25% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - PIPELINE(12KV) - Customers: 1,648 111.4 1.0 1.0 1.4 0.0 - - - - 25.5 0.0 1.9 - - - 34.6 0.1-0.9 0.0-61.1 0.1 1.9 3rd Party - - 100% - - - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - 100% 100% - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - 100% 100% - 2% 10% - Vegetation/Animal - - - - - - - - - - - - - - - 100% 100% - - - - 57% 63% - Weather/Fire/Earthquake - - - - - - - - - 100% 100% 100% - - - - - - - - - 42% 27% 100% 19

Reliability Histories for Individual Circuits Serving La Habra - 6 of 7 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 PRIVET(12KV) - Customers: 1,979 237.9 1.5 2.0 50.4 0.6-69.0 0.3-89.5 0.1-15.1 0.2-0.3 0.0-78.9 1.2 1.9 183.7 1.5 1.9 3rd Party - - - 28% 42% - 8% 26% - - - - - - - - - - - - - - - - Equipment Failure 99% 99% - 25% 30% - 64% 14% - 97% 49% - - - - - - - 100% 100% 50% 90% 84% 50% Operation - - - 47% 29% - 0% 1% - 3% 51% - - - - 100% 100% - - - - 2% 5% - Other - - - - - - - - - - - - 100% 100% - - - - - - - 8% 11% - Vegetation/Animal 1% 1% 100% - - - 28% 59% - - - - - - - - - - - - 50% - - 50% PRUNE(12KV) - Customers: 2,141 6.4 0.0-178.0 1.0 - - - - - - - 4.0 0.1 - - - - - - - 4.0 0.1-3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 72% 69% - 13% 7% - - - - - - - - - - - - - - - - - - - Operation 28% 31% - 83% 84% - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - 3% 8% - - - - - - - 100% 100% - - - - - - - 100% 100% - PYRUS(12KV) - Customers: 1,484 67.0 0.2 3.0 107.8 2.2 1.4 10.1 0.2-25.9 0.1 - - - 1.0 2.1 0.0-2.6 0.0 0.5 30.6 0.2 1.5 3rd Party - - 35% - - - - - - - - - - - 100% - - - - - - - - 67% Equipment Failure 62% 52% 1% 78% 93% 100% - - - 100% 100% - - - - 100% 100% - - - - 92% 90% - Operation 0% 0% - 9% 3% - 40% 93% - - - - - - - - - - 100% 100% 100% 8% 10% 33% Vegetation/Animal - - 65% 14% 4% - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 38% 48% - - - - 60% 7% - - - - - - - - - - - - - - - - RICKO(12KV) - Customers: 2,862 8.2 0.0 0.3 - - - 50.2 0.5 1.0 - - - 55.7 0.1 0.9 22.0 0.1 - - - - 77.7 0.2 0.9 3rd Party - - - - - - - - - - - - 89% 60% 100% - - - - - - 64% 33% 100% Equipment Failure 99% 98% - - - - 100% 100% - - - - - - - 100% 100% - - - - 28% 46% - Operation 1% 2% 100% - - - - - - - - - 11% 40% - - - - - - - 8% 21% - Vegetation/Animal - - - - - - - - 100% - - - - - - - - - - - - - - - 20

Reliability Histories for Individual Circuits Serving La Habra - 7 of 7 CircuitHistory 7 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 RONWOOD(12KV) - Customers: 235 241.8 2.0 1.7 5.0 0.0 3.0 19.0 0.1 0.9 89.3 0.2 1.5 - - - - - - - - - 89.3 0.2 1.5 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 47% 50% 58% - - - - - - 100% 100% 100% - - - - - - - - - 100% 100% 100% Operation 53% 50% 42% 100% 100% 33% - - - - - - - - - - - - - - - - - - Other - - - - - 33% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 33% 100% 100% 100% - - - - - - - - - - - - - - - TONNER(12KV) - Customers: 1,685 36.9 0.8 1.2 18.6 0.2-34.4 0.3 - - - - - - - 234.9 2.3 2.3 38.8 0.2-273.7 2.4 2.3 3rd Party 98% 99% 100% 22% 40% - - - - - - - - - - - - - - - - - - - Equipment Failure 2% 0% - - - - 29% 23% - - - - - - - 97% 93% 100% 27% 27% - 87% 88% 100% Operation 1% 1% - - - - - - - - - - - - - 3% 7% - 64% 58% - 11% 11% - Vegetation/Animal - - - 78% 60% - 71% 77% - - - - - - - - - - 9% 16% - 1% 1% - TWISTER(12KV) - Customers: 1,733 43.7 1.0-222.4 2.0-18.8 0.1 2.0 0.5 0.0 - - - - 6.3 0.0-14.8 0.1-21.5 0.1-3rd Party - - - 70% 50% - - - 50% - - - - - - - - - - - - - - - Equipment Failure 68% 4% - 30% 50% - 83% 79% - - - - - - - 40% 18% - 96% 53% - 77% 40% - Operation - - - 0% 0% - 17% 21% - 100% 100% - - - - 60% 82% - 4% 47% - 23% 60% - Other - - - - - - - - 50% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 32% 96% - - - - - - - - - - - - - - - - - - - - - - WHIPSTOCK(12KV) - Customers: 908 416.8 2.7 2.3 271.0 1.3 1.3 378.5 3.6 1.9 167.2 0.8-21.8 0.2-7.0 0.0-10.8 0.2-206.7 1.3-3rd Party 14% 5% - - - - 5% 25% 100% - - - - - - - - - - - - - - - Equipment Failure 24% 37% - 92% 77% 77% 82% 39% - 2% 1% - 7% 4% - 85% 50% - - - - 5% 2% - Operation 15% 9% 0% - - - 5% 1% - - - - 1% 1% - 15% 50% - 100% 100% - 6% 19% - Other 23% 37% - - - - 4% 7% - - - - - - - - - - - - - - - - Vegetation/Animal - - 43% 8% 23% 23% 3% 28% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 23% 13% 57% - - - - - - 98% 99% - 92% 96% - - - - - - - 89% 80% - 21