Circuit Reliability Review

Circuit Reliability Review Alhambra 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 MONTEBELLO District CityList1 ALHAMBRA EAST LOS ANGELES EL MONTE LOS ANGELES MONTEBELLO MONTEREY PARK NORTH EL MONTE PICO RIVERA ROSEMEAD SOUTH EL MONTE SOUTH SAN GABRIEL 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 Alhambra CircuitList1 There are 42 circuits that serve Alhambra 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers ALMANSOR(16KV) 2,088 ROANOKE(4.16KV) 377 - - ASTEROID(16KV) 4,203 SARAH(4.16KV) 766 - - BILTON(16KV) 3,170 SHORB(4.16KV) 1,045 - - BRAUN(16KV) 1,187 ST. CHARLES(16KV) 1,174 - - BRUNNER(4.16KV) 880 STORY(4.16KV) 569 - - CHUCKER(4.16KV) 858 TAKNING(16KV) 3,176 - - COMMONWEALTH(4.16KV) 982 TELSTAR(16KV) 2,835 - - CORDOVA(4.16KV) 219 TEST(16KV) 3,014 - - CRESTA(16KV) 3,132 TRI CITY(16KV) 2,194 - - DEERFIELD(16KV) 2,689 TRIUMPH(16KV) 1,499 - - DOLGEVILLE(4.16KV) 311 WILMAR(4.16KV) 967 - - ELGIN(4.16KV) 391 WOODWARD(4.16KV) 426 - - FLORAL(16KV) 2,044 - - - GERONA(16KV) 2,995 - - - GLENDON(4.16KV) 694 - - - GRAVES(4.16KV) 319 - - - GUEST(4.16KV) 689 - - - HAMPTON(4.16KV) 490 - - - HELLMAN(4.16KV) 619 - - - HIDALGO(4.16KV) 410 - - - HONOR(16KV) 2,143 - - - HOOVER(4.16KV) 257 - - - KAY(16KV) 2,213 - - - MARENGO(4.16KV) 681 - - - MARGUERITA(16KV) 1,554 - - - MAYFAIR(4.16KV) 926 - - - MERCER(16KV) 3,873 - - - MIDWICK(4.16KV) 756 - - - PAT(16KV) 2,910 - - - PEDESTRIAN(4.16KV) 1,052 - - - Grand Total 62,777 7

Reliability History of Circuits Serving Alhambra (No Exclusions) BarChart 2014 2015 2016 2017 250.0 229.1 SAIDI (average minutes of sustained interruptions) 200.0 150.0 100.0 50.0 198.9 112.1 114.8 172.7 134.5 139.7 109.8 Alhambra 0.0 SAIFI (average frequency of sustained interruptions) 2.0 1.5 1.0 0.5 1.6 1.7 1.8 1.0 0.9 1.1 1.0 1.2 SCE SYSTEMWIDE 0.0 ** Exclusions are days which utilities are allowed to MAIFI (average frequency of momentary interruptions) 3.0 2.5 2.0 1.5 1.0 0.5 2.1 2.8 1.4 1.4 2.5 1.6 2.2 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 Alhambra 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 3.9% Other 6.7% Weather /Fire /Earthquake 22.2% Operation 6.3% 3rd Party 22.5% Equipment Failure 38.4% 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 Alhambra 2017 SAIFIChart Contributions to SAIFI by Outage Cause Vegetation /Animal 4.5% 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 10.1% Operation 11.7% Weather /Fire /Earthquake 15.9% 3rd Party 18.8% Equipment Failure 39.0% 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 Alhambra Updated through Dec 2017

Average Reliability of 42 Circuits Serving Alhambra 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 42 Circuits Serving Alhambra -- Total Customers: 62,777 198.9 1.6 2.1 229.1 1.7 2.8 172.7 1.8 2.5 44.7 0.3 0.6 30.0 0.3 0.6 24.7 0.3 0.5 10.3 0.1 0.5 109.8 1.0 2.2 3rd Party 14% 6% 18% 7% 11% 6% 17% 15% 10% 8% 2% 2% 53% 34% 12% 21% 30% 36% 2% 1% 10% 22% 19% 15% Equipment Failure 39% 50% 27% 27% 22% 7% 47% 53% 27% 28% 38% 13% 26% 28% 25% 61% 47% - 67% 50% 9% 38% 39% 12% Operation 6% 7% 4% 7% 7% 2% 19% 14% 4% 6% 15% - 2% 1% 8% 8% 7% 4% 17% 39% - 6% 12% 3% Other 10% 9% 13% 12% 21% 34% 8% 7% 29% 7% 16% 57% 6% 11% 33% 6% 3% 17% 8% 8% 14% 7% 10% 31% Vegetation/Animal 1% 11% 27% 7% 11% 40% 4% 7% 24% - - 13% 11% 3% 10% 2% 12% 35% 5% 3% 68% 4% 5% 30% Weather/Fire/Earthquake 29% 17% 10% 39% 28% 11% 4% 4% 5% 52% 29% 15% 2% 23% 11% 3% 1% 8% - - - 22% 16% 9% 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 Alhambra - 1 of 11 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 ALMANSOR(16KV) - Customers: 2,088 225.6 3.9 1.5 70.1 1.5 0.6 190.1 2.6 1.6 - - CircuitHistory - - - - 70.9 0.9 0.1 157.2 0.9 0.1 228.1 1.8 0.3 3rd Party - - - - - - 6% 0% 27% - - 1- - - - 100% 100% 100% - - - 31% 48% 49% Equipment Failure 91% 71% 61% 27% 3% - 85% 96% 73% - - - - - - - - - 88% 93% 100% 61% 49% 51% Operation 4% 1% - - - - 0% 1% - - - - - - - - - - 10% 4% - 7% 2% - Other - - - 18% 47% 48% 4% 1% - - - - - - - - - - 1% 3% - 1% 2% - Vegetation/Animal 5% 29% 39% 55% 50% 52% 4% 1% - - - - - - - - - - - - - - - - ASTEROID(16KV) - Customers: 4,203 343.2 1.0 2.0 316.6 3.3 5.7 300.0 5.0 4.0 - - - 10.7 1.0 3.0 97.6 1.1 1.0 - - 1.0 108.3 2.1 5.0 3rd Party - - - - - - 49% 40% - - - - - - - - - - - - - - - - Equipment Failure 13% 4% - 90% 64% 12% 27% 40% 25% - - - 28% 0% - 97% 99% - - - - 90% 51% - Operation - - - 1% 4% - 18% 20% - - - - 6% 0% - 2% 1% - - - - 3% 1% - Other - - - - - - - - 25% - - - - - 67% - - - - - - - - 40% Vegetation/Animal - - 100% 2% 1% 71% 0% 0% 25% - - - - - - 1% 0% 100% - - 100% 0% 0% 40% Weather/Fire/Earthquake 87% 96% - 7% 31% 17% 6% 0% 25% - - - 67% 99% 33% - - - - - - 7% 48% 20% BILTON(16KV) - Customers: 3,170 175.6 1.6 3.0 71.3 1.0 5.0 400.6 3.0 2.4 - - 1.0 1.2 0.0 2.0 44.5 1.0 1.0 - - - 45.7 1.0 4.0 3rd Party - - - 84% 98% 20% 37% 36% 54% - - - - - - 100% 100% 100% - - - 97% 100% 25% Equipment Failure 100% 100% 33% 16% 2% 20% 43% 37% 46% - - - 100% 100% 50% - - - - - - 3% 0% 25% Operation - - - 0% 0% - 1% 0% - - - - - - 50% - - - - - - - - 25% Other - - 33% - - 20% 2% 1% - - - 100% - - - - - - - - - - - 25% Vegetation/Animal - - 33% - - 40% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 17% 26% - - - - - - - - - - - - - - - - BRAUN(16KV) - Customers: 1,187 36.7 1.1 3.9 669.0 2.4 2.4 213.5 3.0 2.0 418.7 0.3-85.4 0.1 2.8 33.4 0.2 - - - - 537.5 0.6 2.8 Equipment Failure 73% 97% - 87% 83% 17% 15% 36% 50% - - - 98% 94% 64% - - - - - - 16% 18% 64% Operation - - - 6% 14% - - - - - - - - - - 100% 100% - - - - 6% 30% - Other - - - - - 41% 85% 64% 50% - - - - - - - - - - - - - - - Vegetation/Animal 10% 1% 76% - - 41% - - - - - - 2% 6% 36% - - - - - - 0% 1% 36% Weather/Fire/Earthquake 17% 2% 24% 7% 3% - - - - 100% 100% - - - - - - - - - - 78% 52% - 15

Reliability Histories for Individual Circuits Serving Alhambra - 2 of 11 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 BRUNNER(4.16KV) - Customers: 880 - - - 31.0 0.4 2.0 21.9 1.0 - - - - 13.9 0.1-31.7 0.0 1.0 - - - 45.5 0.1 1.0 Equipment Failure - - - - - - 91% 97% - - - - - - - 100% 100% - - - - 70% 35% - Operation - - - 28% 90% 2% 9% 3% - - - - 100% 100% - - - 100% - - - 30% 65% 100% Other - - - - - 98% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 72% 10% - - - - - - - - - - - - - - - - - - - CHUCKER(4.16KV) - Customers: 858 443.1 0.9 2.0 0.2 0.0 3.0 96.6 0.6 1.5 94.0 1.0 1.1 - - 1.0 47.8 1.0 1.0 - - - 141.8 2.0 3.1 3rd Party - - 48% - - 33% 98% 79% 94% - - - - - 100% - - - - - - - - 32% Equipment Failure 100% 100% - - - - 1% 16% 6% 100% 100% 9% - - - - - - - - - 66% 51% 3% Operation - - - 100% 100% - 2% 5% - - - - - - - 100% 100% - - - - 34% 49% - Other - - 52% - - 67% - - - - - 91% - - - - - 100% - - - - - 65% COMMONWEALTH(4.16KV) - Customers: 982 394.4 1.0-36.0 1.0 1.0 116.4 2.2 1.0 15.4 0.0 1.0 - - 1.0 - - 2.0 - - 1.0 15.4 0.0 5.0 3rd Party - - - - - - 4% 3% - - - - - - - - - - - - 100% - - 20% Equipment Failure - - - - - - - - - 100% 100% - - - - - - - - - - 100% 100% - Operation - - - - - - 0% 3% - - - - - - - - - - - - - - - - Other 100% 100% - - - 100% 96% 94% 100% - - 100% - - 100% - - 50% - - - - - 60% Weather/Fire/Earthquake - - - 100% 100% - - - - - - - - - - - - 50% - - - - - 20% CORDOVA(4.16KV) - Customers: 219 56.4 1.0 2.0 121.1 4.1 2.0 526.2 2.3 1.0 - - - 67.9 0.2 - - - - - - - 67.9 0.2 - Equipment Failure 100% 100% - - - - 26% 86% 100% - - - - - - - - - - - - - - - Operation - - - - - - 74% 14% - - - - 100% 100% - - - - - - - 100% 100% - Other - - - 14% 50% 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - 50% 7% 25% 50% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - 50% 79% 25% - - - - - - - - - - - - - - - - - - - 16

Reliability Histories for Individual Circuits Serving Alhambra - 3 of 11 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 CRESTA(16KV) - Customers: 3,132 457.2 2.5 1.5 854.4 7.2 4.2 28.8 1.1 2.2 - - - 67.4 0.2 0.8 22.8 0.1 - - - - 90.2 0.2 0.8 3rd Party - - - - - - - - - - - - - - - 33% 80% - - - - 8% 28% - Equipment Failure 7% 41% - 6% 1% - 99% 99% 49% - - - - - - 66% 20% - - - - 17% 7% - Operation 9% 5% 28% - - - 1% 1% 51% - - - - - - - - - - - - - - - Other - - - 27% 34% 63% - - - - - - - - - 1% 0% - - - - 0% 0% - Vegetation/Animal 1% 13% 72% 8% 14% 24% - - - - - - 100% 100% 100% - - - - - - 75% 65% 100% Weather/Fire/Earthquake 84% 41% - 60% 51% 13% - - - - - - - - - - - - - - - - - - DEERFIELD(16KV) - Customers: 2,689 112.1 2.1 1.8 31.9 0.1 2.0 107.2 1.6 5.4 45.2 0.0 - - - 1.0 - - 1.0 1.2 0.0-46.3 0.0 2.0 3rd Party - - 55% - - - - - - - - - - - - - - - - - - - - - Equipment Failure 69% 61% 45% 72% 36% - 76% 37% 26% - - - - - 100% - - - 100% 100% - 3% 7% 50% Operation 1% 1% - 6% 12% - - - - - - - - - - - - - - - - - - - Other 28% 38% - 3% 7% 50% - - 37% - - - - - - - - - - - - - - - Vegetation/Animal 2% 1% - 16% 41% 50% 24% 63% 18% - - - - - - - - 100% - - - - - 50% Weather/Fire/Earthquake - - - 4% 3% - - - 18% 100% 100% - - - - - - - - - - 97% 93% - DOLGEVILLE(4.16KV) - Customers: 311 61.6 1.1 - - - 2.0 34.5 1.7 - - - - - - - - - 1.0 - - - - - 1.0 3rd Party 23% 8% - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 100% 100% - - - - - - - - - - - - - - - - Operation 77% 92% - - - - - - - - - - - - - - - - - - - - - - Other - - - - - 100% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - 100% - - - - - 100% ELGIN(4.16KV) - Customers: 391 54.0 2.1 3.0 262.6 5.6 4.0 137.8 2.0 1.0 - - - 11.3 0.0 - - - 1.0 - - - 11.3 0.0 1.0 3rd Party - - 67% - - 25% - - - - - - - - - - - - - - - - - - Equipment Failure 64% 48% - 51% 27% 25% 100% 100% 100% - - - - - - - - - - - - - - - Operation 21% 4% - 4% 1% - - - - - - - 100% 100% - - - - - - - 100% 100% - Other - - - 6% 36% 25% - - - - - - - - - - - - - - - - - - Vegetation/Animal 15% 49% 33% 3% 18% 25% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 36% 18% - - - - - - - - - - - - 100% - - - - - 100% 17

Reliability Histories for Individual Circuits Serving Alhambra - 4 of 11 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 FLORAL(16KV) - Customers: 2,044 396.9 3.8 2.7 103.5 1.8 2.0 303.5 2.1 7.0 3.3 0.0 - - - - 70.7 0.3 1.0 7.7 0.0 2.0 81.7 0.4 3.0 3rd Party 45% 3% 37% 98% 99% - - - 14% - - - - - - - - - - - 50% - - 33% Equipment Failure 11% 20% 58% - - - 46% 5% - - - - - - - 35% 18% - 100% 100% - 40% 25% - Operation 2% 1% - - - - 5% 48% - 100% 100% - - - - 16% 18% - - - - 18% 23% - Other 12% 25% 2% - - - 49% 48% 71% - - - - - - 49% 64% - - - - 43% 52% - Vegetation/Animal - - - 2% 1% 100% - - 14% - - - - - - - - 100% - - 50% - - 67% Weather/Fire/Earthquake 31% 50% 4% - - - - - - - - - - - - - - - - - - - - - GERONA(16KV) - Customers: 2,995 329.9 1.6 0.5 11.1 0.1 3.0 9.4 0.0 2.3 121.3 1.6-123.1 1.6 0.5 - - - - - - 244.4 3.2 0.5 Equipment Failure 96% 81% - - - - 100% 100% 36% 100% 99% - 100% 100% 100% - - - - - - 100% 100% 100% Operation 2% 2% - 91% 94% - - - - 0% 1% - - - - - - - - - - 0% 0% - Other - - 50% - - 67% - - 64% - - - - - - - - - - - - - - - Vegetation/Animal 2% 2% - - - 33% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 1% 15% 50% 9% 6% - - - - - - - - - - - - - - - - - - - GLENDON(4.16KV) - Customers: 694 - - 2.0 - - 0.2 29.3 0.0 1.0 73.2 1.0 1.0 - - - - - 1.0 - - - 73.2 1.0 2.0 3rd Party - - 50% - - - - - - - - - - - - - - 100% - - - - - 50% Equipment Failure - - - - - - 100% 100% - - - - - - - - - - - - - - - - Operation - - - - - 100% - - - - - - - - - - - - - - - - - - Other - - 50% - - - - - 100% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - 100% 100% 100% - - - - - - - - - 100% 100% 50% GRAVES(4.16KV) - Customers: 319 189.0 1.3 - - - 2.0 20.0 1.0 1.0 - - - - - - 13.4 0.0 1.0 - - - 13.4 0.0 1.0 Equipment Failure 96% 80% - - - - 100% 100% - - - - - - - 100% 100% - - - - 100% 100% - Operation 4% 20% - - - - - - - - - - - - - - - - - - - - - - Other - - - - - 100% - - 100% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - 100% - - - - - 100% 18

Reliability Histories for Individual Circuits Serving Alhambra - 5 of 11 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 GUEST(4.16KV) - Customers: 689 - - 1.0 93.6 1.1 0.0 15.2 0.0 2.0 - - - 3.6 0.0 2.0 6.3 0.0 1.0 - - - 9.9 0.0 3.0 3rd Party - - - - - - - - - - - - - - 100% - - - - - - - - 67% Equipment Failure - - - 92% 91% - 100% 100% 50% - - - - - - 100% 100% - - - - 64% 42% - Operation - - - 8% 9% 100% - - 50% - - - 100% 100% - - - - - - - 36% 58% - Other - - 100% - - - - - - - - - - - - - - 100% - - - - - 33% HAMPTON(4.16KV) - Customers: 490 43.1 2.0 1.0 136.9 4.1 2.0 154.0 2.2 1.0 - - - - - - - - - - - - - - - Equipment Failure 81% 50% - - - - 88% 92% 100% - - - - - - - - - - - - - - - Operation - - - 13% 2% - - - - - - - - - - - - - - - - - - - Other - - - 12% 49% 50% 12% 8% - - - - - - - - - - - - - - - - Vegetation/Animal 19% 50% 100% 6% 24% 50% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 69% 25% - - - - - - - - - - - - - - - - - - - HELLMAN(4.16KV) - Customers: 619 3.4 0.0 3.0 4.8 0.1 1.0 293.6 1.0 1.0 - - 1.0 - - - - - - - - - - - 1.0 3rd Party - - 67% - - - - - - - - - - - - - - - - - - - - - Equipment Failure 70% 50% - - - - - - - - - - - - - - - - - - - - - - Operation 30% 50% - 100% 100% 100% - - - - - - - - - - - - - - - - - - Other - - 33% - - - 100% 100% 100% - - 100% - - - - - - - - - - - 100% HIDALGO(4.16KV) - Customers: 410 52.1 2.0 1.0 119.4 4.0 2.0 172.3 2.2 1.0 570.1 1.1 - - - - 3.9 0.0 - - - - 574.0 1.1-3rd Party - - - - - - - - - 95% 94% - - - - - - - - - - 95% 91% - Equipment Failure 85% 50% - - - - 100% 100% 100% - - - - - - - - - - - - - - - Operation - - - - - - - - - 0% 1% - - - - 100% 100% - - - - 1% 5% - Other - - - 14% 50% 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal 15% 50% 100% 7% 25% 50% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 79% 25% - - - - 5% 4% - - - - - - - - - - 4% 4% - 19

Reliability Histories for Individual Circuits Serving Alhambra - 6 of 11 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 HONOR(16KV) - Customers: 2,143 - - - 64.7 0.7 3.0 24.1 0.0 1.0 42.0 0.2 2.0 - - - 53.3 1.0 1.0 - - 2.0 95.3 1.2 5.0 Equipment Failure - - - - - - - - - - - - - - - 81% 4% - - - - 45% 3% - Operation - - - 2% 2% - 95% 70% - - - - - - - 0% 0% - - - - 0% 0% - Other - - - - - 33% 5% 30% 100% 100% 100% 100% - - - - - - - - 100% 44% 16% 80% Vegetation/Animal - - - - - 67% - - - - - - - - - 19% 96% 100% - - - 10% 81% 20% Weather/Fire/Earthquake - - - 98% 98% - - - - - - - - - - - - - - - - - - - HOOVER(4.16KV) - Customers: 257 - - - - - 2.0 104.5 1.2 0.8 - - - - - - 21.8 0.0 1.0 - - - 21.8 0.0 1.0 3rd Party - - - - - 50% - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 19% 86% - - - - - - - 87% 75% - - - - 87% 75% - Operation - - - - - - - - - - - - - - - 13% 25% 100% - - - 13% 25% 100% Other - - - - - 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - 81% 14% 100% - - - - - - - - - - - - - - - KAY(16KV) - Customers: 2,213 43.5 1.1 3.0 93.8 0.2 3.0 169.3 1.1 4.0 17.8 0.1 1.0 205.9 1.5 1.1 26.5 0.0 2.0 27.2 0.4 2.0 277.4 2.0 6.1 3rd Party - - - 15% 12% - 0% 0% - - - - 100% 100% 100% - - 100% - - - 74% 75% 51% Equipment Failure 73% 95% 33% 29% 31% - 90% 94% 50% - - - - - - 100% 100% - - - - 10% 1% - Operation 27% 5% - 3% 27% - 1% 4% - 56% 93% - - - - - - - 83% 99% - 12% 23% - Other - - - - - 67% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - 67% 7% 7% 33% 9% 2% 50% - - - - - - - - - 17% 1% 100% 2% 0% 33% Weather/Fire/Earthquake - - - 46% 23% - - - - 44% 7% 100% - - - - - - - - - 3% 0% 16% MARENGO(4.16KV) - Customers: 681 29.3 0.1-190.8 0.3 2.0 133.7 0.2 1.0 - - 1.0 - - - - - 4.0 0.8 0.0-0.8 0.0 5.0 3rd Party - - - - - - - - - - - 100% - - - - - - - - - - - 20% Equipment Failure 100% 100% - 30% 28% - 77% 70% - - - - - - - - - - - - - - - - Operation - - - 0% 4% - 5% 20% - - - - - - - - - - 100% 100% - 100% 100% - Other - - - 70% 68% 100% - - - - - - - - - - - 75% - - - - - 60% Weather/Fire/Earthquake - - - - - - 18% 10% 100% - - - - - - - - 25% - - - - - 20% 20

Reliability Histories for Individual Circuits Serving Alhambra - 7 of 11 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 MARGUERITA(16KV) - Customers: 1,554 0.2 0.0 1.0 583.7 1.6 4.0 613.4 2.4 3.0 - - 3.0 - - - 69.5 2.1-0.3 0.0 2.0 69.8 2.1 5.0 Equipment Failure - - - - - - 100% 100% 33% - - 67% - - - 100% 100% - 100% 100% 50% 100% 100% 60% Operation 100% 100% - 49% 38% - - - 33% - - - - - - - - - - - - - - - Other - - 100% - - 50% - - 34% - - - - - - - - - - - - - - - Vegetation/Animal - - - 51% 62% 50% - - - - - 33% - - - - - - - - 50% - - 40% MAYFAIR(4.16KV) - Customers: 926 2.6 0.0 1.0 - - 2.0 1.2 0.0 1.0 - - - - - - 21.2 0.0 - - - - 21.2 0.0-3rd Party - - 100% - - - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - - - - - - - - - - - - - 47% 16% - - - - 47% 16% - Operation - - - - - 50% 100% 100% - - - - - - - - - - - - - - - - Other - - - - - 50% - - 100% - - - - - - 53% 84% - - - - 53% 84% - MERCER(16KV) - Customers: 3,873 69.1 0.4 1.2 143.6 1.7 1.4 2.2 0.0 3.0 6.0 0.0 - - - - - - - - - - 6.0 0.0 - Equipment Failure 12% 2% - 69% 65% 28% - - - 100% 100% - - - - - - - - - - 100% 100% - Operation 88% 98% 100% 31% 35% - 24% 67% - - - - - - - - - - - - - - - - Other - - - - - - - - 35% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 72% 76% 33% 65% - - - - - - - - - - - - - - - MIDWICK(4.16KV) - Customers: 756 16.7 0.0 1.0 - - - 24.6 1.0 1.0 33.6 1.0 - - - - - - - - - - 33.6 1.0-3rd Party - - 100% - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 100% 100% - - - - - - - 64% 4% - - - - - - - - - - 64% 4% - Other - - - - - - 100% 100% 100% 36% 96% - - - - - - - - - - 36% 96% - 21

Reliability Histories for Individual Circuits Serving Alhambra - 8 of 11 CircuitHistory 8 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 PAT(16KV) - Customers: 2,910 544.5 3.5 5.9 1.4 0.0 1.0 112.2 1.2 1.0 35.6 0.7 0.3 209.7 1.7 1.0 - - - 44.7 0.8 0.3 290.0 3.2 1.6 3rd Party 63% 7% 34% - - - - - - - - - 88% 59% - - - - - - - 64% 32% - Equipment Failure 35% 65% 50% - - - 88% 95% - - - - - - - - - - 98% 93% 100% 15% 22% 18% Operation - - - 100% 100% - 2% 1% - - - - - - - - - - 0% 1% - 0% 0% - Other 2% 28% 17% - - - 10% 4% 100% 94% 100% 100% 12% 41% 100% - - - - - - 20% 44% 82% Vegetation/Animal - - - - - 100% 0% 0% - - - - - - - - - - 2% 6% - 0% 1% - Weather/Fire/Earthquake - - - - - - - - - 6% 0% - - - - - - - - - - 1% 0% - PEDESTRIAN(4.16KV) - Customers: 1,052 72.2 2.0 3.0 482.6 3.0 3.0 410.3 4.0 4.0 - - 1.0 - - - - - 2.0 24.9 2.0 1.0 24.9 2.0 4.0 3rd Party - - - 15% 33% - - - 25% - - - - - - - - 100% - - - - - 50% Equipment Failure 40% 50% 34% - - - 75% 75% 25% - - - - - - - - - - - - - - - Operation - - - 35% 35% 1% 1% 1% - - - - - - - - - - 100% 100% - 100% 100% - Other - - - 50% 32% 66% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - 66% - - 33% - - 50% - - - - - - - - - - - 100% - - 25% Weather/Fire/Earthquake 60% 50% - - - - 23% 25% - - - 100% - - - - - - - - - - - 25% ROANOKE(4.16KV) - Customers: 377 40.0 1.9 0.9 161.2 5.0 2.0 145.0 2.1 2.0 145.5 1.0 - - - - - - - - - - 145.5 1.0 - Equipment Failure 81% 50% - - - - 100% 99% 51% - - - - - - - - - - - - - - - Operation - - - - - - 0% 1% 49% - - - - - - - - - - - - - - - Other - - - 11% 40% 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal 19% 50% 100% 5% 20% 50% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 85% 40% - - - - 100% 100% - - - - - - - - - - 100% 100% - SARAH(4.16KV) - Customers: 766 764.4 1.1 3.0 - - 2.0 - - - 584.9 2.0 - - - - - - - - - - 584.9 2.0-3rd Party - - 33% - - 50% - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 0% 10% - - - 50% - - - 6% 49% - - - - - - - - - - 6% 49% - Other 100% 90% 67% - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - 94% 51% - - - - - - - - - - 94% 51% - 22

Reliability Histories for Individual Circuits Serving Alhambra - 9 of 11 CircuitHistory 9 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 SHORB(4.16KV) - Customers: 1,045 0.9 0.1 2.0 632.4 1.0 2.9 98.2 1.0 2.0 - - 3.0 - - - - - 1.0 - - - - - 4.0 3rd Party - - - - - - - - 100% - - - - - - - - 100% - - - - - 25% Equipment Failure - - - 99% 95% 33% 100% 100% - - - - - - - - - - - - - - - - Operation 100% 100% - 1% 5% - - - - - - - - - - - - - - - - - - - Other - - 100% - - 67% - - - - - 100% - - - - - - - - - - - 75% ST. CHARLES(16KV) - Customers: 1,174 38.4 1.5 2.6 - - 3.0 94.2 2.2 4.0 - - - - - - - - - - - - - - - Equipment Failure 87% 94% - - - - 21% 47% 50% - - - - - - - - - - - - - - - Operation - - - - - - 60% 7% - - - - - - - - - - - - - - - - Other - - - - - 67% - - - - - - - - - - - - - - - - - - Vegetation/Animal 13% 6% 100% - - 33% 19% 46% 50% - - - - - - - - - - - - - - - STORY(4.16KV) - Customers: 569 41.1 1.3 2.0 306.6 5.5 5.0 234.9 2.0 6.0 26.5 0.2 6.0 - - - - - - 81.9 1.0-108.4 1.2 6.0 3rd Party - - - - - - - - 17% - - - - - - - - - - - - - - - Equipment Failure 84% 35% - 14% 1% 20% 100% 100% 17% - - - - - - - - - - - - - - - Operation - - - 8% 7% - - - - 100% 100% - - - - - - - - - - 24% 13% - Other - - 50% 6% 37% 60% - - 67% - - 67% - - - - - - 100% 100% - 76% 87% 67% Vegetation/Animal 16% 65% 50% 3% 18% 20% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 70% 37% - - - - - - 33% - - - - - - - - - - - 33% TAKNING(16KV) - Customers: 3,176 133.5 2.0 2.0 132.8 0.9 3.1 36.3 1.2 2.0 7.2 0.1 1.0 - - - - - - - - 1.0 7.2 0.1 2.0 3rd Party - - 50% - - 32% 4% 0% 50% - - - - - - - - - - - - - - - Equipment Failure 43% 50% 50% 0% 0% - 93% 99% 50% 17% 3% - - - - - - - - - - 17% 3% - Operation 57% 50% - - - - 3% 0% - 64% 71% - - - - - - - - - - 64% 71% - Other - - - 99% 99% 36% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - 1% 1% 32% - - - - - 100% - - - - - - - - 100% - - 100% Weather/Fire/Earthquake - - - - - - - - - 19% 26% - - - - - - - - - - 19% 26% - 23

Reliability Histories for Individual Circuits Serving Alhambra - 10 of 11 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 CircuitHistory10 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 TELSTAR(16KV) - Customers: 2,835 187.8 1.4 4.1 736.7 2.6 1.5 548.0 2.0 3.0 - - - - - - 6.8 0.0-0.1 0.0-6.9 0.0-3rd Party 54% 91% 31% 10% 26% 22% - - - - - - - - - - - - - - - - - - Equipment Failure 45% 8% 69% 11% 39% - 1% 0% - - - - - - - 21% 32% - - - - 21% 29% - Operation 2% 1% - 1% 8% - 98% 99% - - - - - - - 62% 34% - 100% 100% - 62% 41% - Other - - - - - - - - - - - - - - - 17% 33% - - - - 16% 30% - Vegetation/Animal - - - 0% 0% - 0% 0% 100% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 78% 26% 78% - - - - - - - - - - - - - - - - - - TEST(16KV) - Customers: 3,014 343.0 4.4 4.8 551.5 3.7 7.5 179.7 1.7 3.5 187.7 2.2 1.4 18.4 0.0-53.2 0.1-11.4 0.0 1.0 270.7 2.4 2.4 3rd Party - - - - - - 83% 60% - - - - - - - 4% 13% - 42% 56% - 3% 2% - Equipment Failure 31% 40% 3% 11% 28% 13% 12% 38% 28% 52% 30% 29% 9% 18% - 64% 38% - - - - 49% 30% 17% Operation - - - 7% 3% - 5% 3% - 10% 25% - 3% 32% - 1% 4% - - - - 7% 24% - Other - - 11% 1% 15% 13% - - 28% - - 71% 88% 50% - - - - - - - 6% 0% 41% Vegetation/Animal 5% 30% 13% 4% 16% 33% - - 44% - - - - - - - - - 58% 44% 100% 2% 1% 41% Weather/Fire/Earthquake 65% 30% 73% 78% 38% 41% - - - 38% 45% - - - - 32% 45% - - - - 33% 44% - TRI CITY(16KV) - Customers: 2,194 81.3 0.3 1.0 168.2 1.6 0.5 202.2 4.0 2.0 23.9 0.2 0.4 - - - 7.2 0.0 - - - 1.0 31.2 0.2 1.4 3rd Party - - - 93% 64% 3% - - - - - - - - - - - - - - - - - - Equipment Failure 77% 35% - 2% 0% - 53% 51% 50% - - - - - - 100% 100% - - - - 23% 3% - Operation - - - - - - 4% 24% - 0% 0% - - - - - - - - - - 0% 0% - Other - - - 5% 35% - - - 50% 8% 11% 100% - - - - - - - - - 6% 11% 26% Vegetation/Animal 23% 65% 100% - - 97% 43% 25% - - - - - - - - - - - - 100% - - 74% Weather/Fire/Earthquake - - - - - - - - - 92% 88% - - - - - - - - - - 70% 85% - TRIUMPH(16KV) - Customers: 1,499 26.0 1.0 2.0 13.0 1.0-68.5 1.3 0.5 - - - - - - 11.9 0.0 - - - - 11.9 0.0 - Equipment Failure 100% 100% - - - - 0% 0% 100% - - - - - - 100% 100% - - - - 100% 100% - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - 100% 100% 100% - 100% 100% - - - - - - - - - - - - - - - - 24

Reliability Histories for Individual Circuits Serving Alhambra - 11 of 11 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 CircuitHistory11 SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI WILMAR(4.16KV) - Customers: 967 20.6 1.0 - - - 1.0 2.6 0.0 - - - - - - - - - 1.0 - - - - - 1.0 Equipment Failure 71% 2% - - - - - - - - - - - - - - - - - - - - - - Operation 29% 98% - - - 100% 100% 100% - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - 100% - - - - - 100% WOODWARD(4.16KV) - Customers: 426 - - - 13.4 0.2 1.0 19.6 1.0 - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 100% 100% - - - - - - - - - - - - - - - - Operation - - - 100% 100% - - - - - - - - - - - - - - - - - - - Other - - - - - 100% - - - - - - - - - - - - - - - - - - 25