Circuit Reliability Review

Circuit Reliability Review Palm Desert 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 PALM SPRINGS District CityList1 BANNING BERMUDA DUNES CABAZON CATHEDRAL CITY DESERT HOT SPRINGS INDIAN WELLS MORONGO VALLEY PALM DESERT PALM SPRINGS RANCHO MIRAGE THOUSAND PALMS WHITEWATER CANYON AGUA CALIENTE BAND OF CAHUILLA INDIANS MORONGO 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 Palm Desert CircuitList1 There are 45 circuits that serve Palm Desert 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers ANNENBERG(12KV) 675 REIN(12KV) 1,044 - - ARNEZ(12KV) 1,485 SAND DUNES(12KV) 1,300 - - AZTEC(12KV) 1,478 SENORITA(12KV) 1,526 - - BANDANA(12KV) 1,381 SERAPE(12KV) 930 - - BIGHORN(12KV) 1,487 SNAKE(4.8KV) 109 - - BIT(12KV) 1,157 SOBOBA(12KV) 1,271 - - CAHUILLA(12KV) 1,419 SOMBRERO(12KV) 787 - - CARRIAGE(12KV) 1,158 TABERNA(12KV) 1,871 - - CLUBHOUSE(12KV) 359 TAKOTA(12KV) 858 - - DEEP CANYON(12KV) 370 TANGLEWOOD(12KV) 1,560 - - GALLON(12KV) 1,100 TOLTEC(12KV) 1,285 - - GRANDE(12KV) 1,426 TON(12KV) 914 - - HOMBRE(12KV) 762 TRAVIS(12KV) 791 - - HORN(12KV) 1,699 TRIBAL(12KV) 1,173 - - INCA(12KV) 1,515 WELCOME(4.8KV) 376 - - INCH(12KV) 1,093 - - - IRONTREE(12KV) 1,332 - - - LA QUINTA(33KV) 4 - - - LIZARD(4.8KV) 53 - - - MANITOU(12KV) 2,074 - - - MATADOR(12KV) 1,199 - - - MAYAN(12KV) 1,403 - - - OUNCE(12KV) 881 - - - PALM CITY(12KV) 1,070 - - - PIPER(12KV) 1,057 - - - PISTOLA(12KV) 925 - - - POLO(12KV) 381 - - - PORTOLA(4.8KV) 336 - - - POUND(12KV) 1,019 - - - QUART(12KV) 1,112 - - - Grand Total 47,205 7

Reliability History of Circuits Serving Palm Desert (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 134.5 139.7 112.1 120.8 114.8 98.7 76.0 56.3 Palm Desert SAIFI (average frequency of sustained interruptions) MAIFI (average frequency of momentary interruptions) 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 0.5 0.5 1.0 0.8 0.9 1.4 1.4 1.1 1.0 0.6 1.1 1.6 0.6 0.4 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 Palm Desert 2017 SAIDIChart Other 1.5% Vegetation /Animal 0.1% Contributions to SAIDI by Outage Cause Weather /Fire /Earthquake 4.9% 3rd Party 5.8% Equipment Failure e.g., in-service failure of transformer, switch, or conductors Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors Other e.g., patrolled but no cause found Operations e.g., urgent maintenance w/o 3-day notice 3 rd Party e.g., balloon, car hit pole, dig-in Operation 13.2% Equipment Failure 74.4% 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 Palm Desert 2017 SAIFIChart Vegetation /Animal 0.1% Other 1.9% 3rd Party 3.8% Contributions to SAIFI by Outage Cause Weather /Fire /Earthquake 7.4% 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 19.4% Equipment Failure 67.4% 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 Palm Desert Updated through Dec 2017

Average Reliability of 45 Circuits Serving Palm Desert 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 45 Circuits Serving Palm Desert -- Total Customers: 47,205 56.3 0.5 0.5 120.8 0.8 1.1 76.0 1.0 0.6 36.1 0.2 0.1 16.0 0.1 0.1 42.3 0.3 0.2 4.3 0.0 0.0 98.7 0.6 0.4 3rd Party 7% 5% 7% 2% 0% - 6% 4% 15% 0% 0% - - - - 13% 8% 17% - - - 6% 4% 7% Equipment Failure 65% 64% 69% 66% 64% 34% 83% 69% 63% 85% 81% 56% 52% 53% - 78% 69% 28% 32% 14% 2% 74% 67% 31% Operation 21% 19% 0% 8% 8% 1% 7% 8% 4% 7% 6% - 46% 44% - 5% 20% 5% 18% 31% - 13% 19% 2% Other 0% 0% 6% 23% 22% 13% 5% 18% 18% 0% 0% 31% 1% 2% 100% 3% 3% 50% - - 98% 2% 2% 56% Vegetation/Animal 0% 0% - 0% 0% 48% - - - - - - 0% 1% - 0% 0% - - - - 0% 0% - Weather/Fire/Earthquake 6% 10% 18% 2% 6% 4% - - - 7% 12% 13% - - - - - - 51% 55% - 5% 7% 5% 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 Palm Desert - 1 of 12 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 ANNENBERG(12KV) - Customers: 675 17.9 0.1-127.9 1.1 2.0 62.3 0.4 - - - CircuitHistory - - - - - - - - - - - - - 3rd Party - - - - - - - - - - - 1- - - - - - - - - - - - - Equipment Failure - - - 100% 100% - 100% 100% - - - - - - - - - - - - - - - - Operation 100% 100% - - - - - - - - - - - - - - - - - - - - - - Other - - - - - 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 50% - - - - - - - - - - - - - - - - - - ARNEZ(12KV) - Customers: 1,485 4.2 0.0-11.6 0.1 1.1 39.5 1.2 - - - - - - - 13.5 0.0-12.1 0.1 0.0 25.6 0.1 0.0 Equipment Failure - - - 66% 53% - - - - - - - - - - 100% 100% - 100% 100% 100% 100% 100% 100% Operation 100% 100% - 34% 47% 10% 86% 96% - - - - - - - - - - - - - - - - Other - - - - - - 14% 4% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 90% - - - - - - - - - - - - - - - - - - AZTEC(12KV) - Customers: 1,478 67.7 1.0-331.5 1.0 0.4 18.1 0.1-295.3 2.4 0.8 - - - - - - - - - 295.3 2.4 0.8 Equipment Failure 92% 96% - 99% 98% 100% 58% 46% - 100% 99% 100% - - - - - - - - - 100% 99% 100% Operation 8% 4% - 1% 2% - 42% 54% - 0% 1% - - - - - - - - - - 0% 1% - BANDANA(12KV) - Customers: 1,381 - - 2.0 - - - 50.6 0.2 - - - - 0.4 0.0 - - - - - - - 0.4 0.0-3rd Party - - - - - - 29% 51% - - - - - - - - - - - - - - - - Equipment Failure - - 49% - - - 63% 35% - - - - 100% 100% - - - - - - - 100% 100% - Operation - - - - - - 7% 13% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - 51% - - - - - - - - - - - - - - - - - - - - - 15

Reliability Histories for Individual Circuits Serving Palm Desert - 2 of 12 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 BIGHORN(12KV) - Customers: 1,487 221.2 1.2-154.0 1.4 1.8 69.3 1.1 2.0 2.8 0.0 - - - - 38.9 0.2 - - - - 41.7 0.2 - Equipment Failure 74% 80% - 80% 76% 43% 83% 93% 100% - - - - - - 92% 47% - - - - 86% 41% - Operation 26% 20% - 16% 22% 2% 9% 5% - 100% 100% - - - - 8% 53% - - - - 14% 59% - Other - - - 3% 2% - 7% 2% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 55% - - - - - - - - - - - - - - - - - - BIT(12KV) - Customers: 1,157 126.0 1.9 0.9 1.7 0.0 2.0 329.6 3.4 3.0 10.2 0.0 - - - - - - - - - - 10.2 0.0-3rd Party - - - - - - 39% 30% 64% - - - - - - - - - - - - - - - Equipment Failure 80% 86% 100% 100% 100% - 61% 70% 36% 95% 50% - - - - - - - - - - 95% 50% - Operation 20% 14% - - - - 0% 0% - 5% 50% - - - - - - - - - - 5% 50% - Other - - - - - 50% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 50% - - - - - - - - - - - - - - - - - - CAHUILLA(12KV) - Customers: 1,419 91.2 1.0 2.0 30.0 0.1 - - - - 2.8 0.0 - - - - 9.3 0.1 0.9 - - - 12.1 0.1 0.9 3rd Party - - - - - - - - - 32% 30% - - - - 100% 100% 100% - - - 84% 88% 100% Equipment Failure - - - 100% 100% - - - - 68% 70% - - - - - - - - - - 16% 12% - Operation 0% 0% - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 100% 100% 100% - - - - - - - - - - - - - - - - - - - - - CARRIAGE(12KV) - Customers: 1,158 155.2 1.4 1.3 116.4 0.6 2.0 87.4 0.7 1.7 47.6 0.4 2.3 - - - 111.9 1.0 0.5 28.6 0.1-188.1 1.4 2.7 3rd Party 93% 72% 24% - - - 29% 43% 99% - - - - - - 17% 12% - - - - 10% 8% - Equipment Failure - - - 14% 14% - 64% 38% 1% 96% 87% 74% - - - 83% 88% 50% 49% 37% - 81% 85% 70% Operation 7% 28% - 86% 86% - 7% 19% - 4% 13% - - - - - - - 51% 63% - 9% 7% - Other - - 76% - - 50% - - - - - 26% - - - - - 50% - - - - - 30% Vegetation/Animal - - - - - 50% - - - - - - - - - - - - - - - - - - 16

Reliability Histories for Individual Circuits Serving Palm Desert - 3 of 12 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 CLUBHOUSE(12KV) - Customers: 359 - - - 10.4 1.0 1.9 6.2 0.0 - - - - - - - - - - - - - - - - Equipment Failure - - - 100% 100% 49% 42% 27% - - - - - - - - - - - - - - - - Operation - - - - - - 58% 73% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 51% - - - - - - - - - - - - - - - - - - DEEP CANYON(12KV) - Customers: 370 8.9 0.1-24.6 0.2-12.1 0.1 - - - - - - - 7.9 1.0 1.0 - - - 7.9 1.0 1.0 Equipment Failure - - - 32% 24% - 100% 100% - - - - - - - - - - - - - - - - Operation 100% 100% - 68% 76% - - - - - - - - - - 100% 100% 100% - - - 100% 100% 100% GALLON(12KV) - Customers: 1,100 2.4 0.0-72.9 1.0 1.0 288.5 3.3 2.0 - - - 14.8 0.1-202.6 1.3 - - - 1.0 217.4 1.4 1.0 Equipment Failure - - - - - - 100% 100% - - - - - - - 82% 77% - - - - 77% 73% - Operation 100% 100% - 5% 4% - - - 50% - - - 100% 100% - - - - - - - 7% 6% - Other - - - 95% 96% - - - 50% - - - - - - 18% 23% - - - 100% 17% 22% 100% Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - GRANDE(12KV) - Customers: 1,426 10.1 0.1 1.0 206.6 1.2 3.0 104.1 2.2 2.0 - - 1.0 - - - 35.3 0.1 - - - - 35.3 0.1 1.0 Equipment Failure - - 100% 99% 99% 100% 100% 100% 100% - - - - - - 87% 50% - - - - 87% 50% - Operation 100% 100% - 1% 1% - - - - - - - - - - 13% 50% - - - - 13% 50% - Other - - - - - - - - - - - 100% - - - - - - - - - - - 100% 17

Reliability Histories for Individual Circuits Serving Palm Desert - 4 of 12 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 HOMBRE(12KV) - Customers: 762 55.9 0.5 1.0 85.6 1.0 1.0 - - 1.0 - - - - - - 28.6 0.1 - - - - 28.6 0.1 - Equipment Failure - - 100% 100% 100% 100% - - 100% - - - - - - 100% 100% - - - - 100% 100% - Operation 100% 100% - - - - - - - - - - - - - - - - - - - - - - HORN(12KV) - Customers: 1,699 30.5 0.3-141.8 1.2 2.0 175.2 1.3 0.0 4.0 0.0-5.0 0.0-2.0 0.0 1.0 - - - 11.0 0.1 1.0 3rd Party - - - - - - - - - - - - - - - 100% 100% - - - - 18% 16% - Equipment Failure 31% 6% - 95% 97% - 92% 89% - - - - - - - - - - - - - - - - Operation 62% 89% - 1% 2% - 1% 4% 100% - - - - - - - - - - - - - - - Other 7% 5% - - - 50% 7% 6% - 100% 100% - 100% 100% - - - 100% - - - 82% 84% 100% Vegetation/Animal - - - - - 50% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 4% 1% - - - - - - - - - - - - - - - - - - - INCA(12KV) - Customers: 1,515 133.4 1.0 - - - - 63.8 0.6-115.3 1.1 0.5 - - - 130.8 1.1 0.3 - - - 246.0 2.2 0.7 Equipment Failure 100% 100% - - - - 59% 69% - 100% 100% 100% - - - 100% 100% 100% - - - 100% 100% 100% Operation - - - - - - 41% 31% - - - - - - - - - - - - - - - - INCH(12KV) - Customers: 1,093 63.0 0.3 1.0 123.1 2.1 3.0 73.9 1.2 1.0 - - - 125.0 0.2 1.0 306.3 0.5-6.9 0.1-438.2 0.9 1.0 3rd Party - - 100% - - - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - 42% 51% 66% 88% 98% 100% - - - 100% 100% - 96% 93% - - - - 96% 81% - Operation - - - 2% 2% - 12% 2% - - - - - - - 4% 7% - 100% 100% - 4% 19% - Other - - - 56% 48% - - - - - - - - - 100% - - - - - - - - 100% Vegetation/Animal - - - - - 34% - - - - - - - - - - - - - - - - - - 18

Reliability Histories for Individual Circuits Serving Palm Desert - 5 of 12 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 IRONTREE(12KV) - Customers: 1,332 274.6 1.4 0.0 9.4 0.1 1.1 18.1 0.1 - - - - - - - - - - - - - - - - Equipment Failure 83% 75% 100% 86% 82% - 84% 50% - - - - - - - - - - - - - - - - Operation 17% 25% - 14% 18% 7% 16% 50% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 93% - - - - - - - - - - - - - - - - - - LA QUINTA(33KV) - Customers: 4 475.0 2.0-1194.5 2.0 1.0 833.5 0.5 1.0 434.5 1.0 - - - - - - - 7.5 0.5-442.0 1.5-3rd Party 68% 25% - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - 100% 100% - - - - - - - 100% 100% - 100% 100% - Operation 32% 75% - - - - - - - - - - - - - - - - - - - - - - Other - - - 31% 50% - 100% 100% 100% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 69% 50% - - - - - - - - - - - - - - - - - - - LIZARD(4.8KV) - Customers: 53 39.0 1.0-77.1 1.0 1.0 49.0 1.0 1.0 - - - - - - - - 1.0 - - - - - 1.0 Equipment Failure 100% 100% - - - - 100% 100% - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - 100% 100% - - - 100% - - - - - - - - 100% - - - - - 100% Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - MANITOU(12KV) - Customers: 2,074 10.8 0.1-452.6 2.0 1.0 18.7 1.0-60.6 0.6 0.4 2.0 0.0 - - - - - - - 62.6 0.6 0.4 Equipment Failure 89% 47% - - - - - - - - - - 100% 100% - - - - - - - 3% 2% - Operation 11% 53% - 0% 1% - 5% 1% - - - - - - - - - - - - - - - - Other - - - 91% 50% - 95% 99% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 9% 50% 100% - - - 100% 100% 100% - - - - - - - - - 97% 98% 100% 19

Reliability Histories for Individual Circuits Serving Palm Desert - 6 of 12 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 MATADOR(12KV) - Customers: 1,199 - - 1.0 0.1 0.0-3.5 0.1 - - - - 3.2 0.0 - - - - - - - 3.2 0.0 - Equipment Failure - - 100% - - - - - - - - - - - - - - - - - - - - - Operation - - - 100% 100% - 100% 100% - - - - 100% 100% - - - - - - - 100% 100% - MAYAN(12KV) - Customers: 1,403 41.9 0.3 0.0 246.7 1.9 1.7 15.0 1.0-515.8 1.3 - - - - 95.4 0.3-0.4 0.0-611.6 1.6 - Equipment Failure 62% 57% - 97% 95% 40% - - - 100% 99% - - - - 93% 21% - - - - 98% 85% - Operation 38% 43% 100% 3% 5% - - - - 0% 1% - - - - 7% 79% - 100% 100% - 2% 15% - Other - - - - - - 100% 100% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 60% - - - - - - - - - - - - - - - - - - OUNCE(12KV) - Customers: 881 34.7 0.2-110.7 1.2 1.1 110.5 1.2 0.0 - - - 137.4 0.4-34.9 0.2 0.9 - - - 172.3 0.6 0.9 Equipment Failure 23% 14% - 20% 10% - 99% 97% 100% - - - 71% 31% - 55% 15% - - - - 68% 25% - Operation 65% 62% - 1% 0% 17% 1% 3% - - - - 26% 62% - 7% 29% - - - - 22% 50% - Other 12% 25% - 62% 85% - - - - - - - - - - 38% 56% 100% - - - 8% 20% 100% Vegetation/Animal - - - 17% 5% 83% - - - - - - 3% 7% - - - - - - - 2% 5% - PALM CITY(12KV) - Customers: 1,070 31.7 0.1-347.2 1.3-15.3 1.0 - - - - - - - 98.9 1.4 0.5 - - - 98.9 1.4 0.5 Equipment Failure 83% 75% - 74% 74% - - - - - - - - - - 100% 100% 100% - - - 100% 100% 100% Operation 17% 25% - 26% 26% - - - - - - - - - - - - - - - - - - - Other - - - - - - 100% 100% - - - - - - - - - - - - - - - - 20

Reliability Histories for Individual Circuits Serving Palm Desert - 7 of 12 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 PIPER(12KV) - Customers: 1,057 7.6 0.1-188.6 1.6 3.2 267.1 1.3 1.0 15.7 0.1-0.8 0.0-105.9 0.3 1.0 0.4 0.0-122.8 0.3 1.0 Equipment Failure 7% 5% - 96% 96% 69% 96% 83% - 100% 100% - 100% 100% - 100% 99% 100% 82% 56% - 100% 98% 100% Operation 93% 95% - 4% 4% - 4% 17% - - - - - - - - - - 18% 44% - 0% 1% - Other - - - - - - - - 100% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 31% - - - - - - - - - 0% 1% - - - - 0% 1% - PISTOLA(12KV) - Customers: 925 6.1 0.1 1.0 83.4 0.3-12.1 0.1 - - - - - - - 1.2 0.0 0.1 - - - 1.2 0.0 0.1 3rd Party - - - 38% 17% - - - - - - - - - - - - - - - - - - - Equipment Failure - - 100% 54% 47% - 100% 100% - - - - - - - - - - - - - - - - Operation 100% 100% - 7% 36% - - - - - - - - - - 100% 100% 100% - - - 100% 100% 100% POLO(12KV) - Customers: 381 43.6 0.2 - - - 1.0 22.5 0.1 - - - - - - - - - - - - - - - - 3rd Party - - - - - - 63% 36% - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 100% 100% - - - - 37% 64% - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - PORTOLA(4.8KV) - Customers: 336 444.2 2.0 0.8 585.3 2.7 2.2 394.8 2.0 1.0 - - - 401.7 1.0 - - - - 23.8 1.0-425.5 2.0 - Equipment Failure 41% 51% 100% 77% 66% 7% 100% 100% - - - - - - - - - - - - - - - - Operation 59% 49% - 23% 34% - - - - - - - 100% 100% - - - - 100% 100% - 100% 100% - Other - - - - - 47% - - 100% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 46% - - - - - - - - - - - - - - - - - - 21

Reliability Histories for Individual Circuits Serving Palm Desert - 8 of 12 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 POUND(12KV) - Customers: 1,019 50.9 1.1-71.6 1.0 2.0 116.4 2.6 2.0 - - - - - - - - - 101.2 1.0-101.2 1.0 - Equipment Failure - - - 2% 0% - 97% 99% 100% - - - - - - - - - - - - - - - Operation - - - - - - 3% 1% - - - - - - - - - - - - - - - - Other - - - 97% 100% - - - - - - - - - - - - - - - - - - - Vegetation/Animal 14% 5% - 1% 0% 100% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 86% 95% - - - - - - - - - - - - - - - - 100% 100% - 100% 100% - QUART(12KV) - Customers: 1,112 95.0 1.1 1.0 122.3 1.1 1.0 120.8 1.4 1.0 71.7 0.1 - - - - 4.3 0.0 1.0 - - - 76.1 0.1 1.0 3rd Party - - - 41% 6% - - - - - - - - - - - - - - - - - - - Equipment Failure 96% 93% 100% - - - 100% 98% - - - - - - - - - - - - - - - - Operation 4% 7% - - - - 0% 2% - 100% 100% - - - - - - - - - - 94% 84% - Other - - - 59% 94% - - - 100% - - - - - - 100% 100% 100% - - - 6% 16% 100% Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - REIN(12KV) - Customers: 1,044 44.1 0.3 1.0 20.8 0.2 2.0 48.2 0.3 - - - - 0.2 0.0 - - - - - - - 0.2 0.0 - Equipment Failure 93% 93% 100% 50% 18% 1% 81% 14% - - - - 100% 100% - - - - - - - 100% 100% - Operation 7% 7% - 50% 82% - 19% 86% - - - - - - - - - - - - - - - - Other - - - - - 49% - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 50% - - - - - - - - - - - - - - - - - - SAND DUNES(12KV) - Customers: 1,300 - - - 8.0 0.0 1.0 10.9 0.0-13.3 0.1 - - - - - - - - - - 13.3 0.1 - Equipment Failure - - - 70% 57% - 100% 100% - - - - - - - - - - - - - - - - Operation - - - 30% 43% - - - - 100% 100% - - - - - - - - - - 100% 100% - Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - 22

Reliability Histories for Individual Circuits Serving Palm Desert - 9 of 12 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 SENORITA(12KV) - Customers: 1,526 - - 1.0 111.3 1.4-3.0 0.0 1.0 - - - - - - 23.2 0.1-14.3 0.0-37.4 0.1 - Equipment Failure - - 100% 100% 100% - 83% 23% 100% - - - - - - 100% 100% - 100% 100% - 100% 100% - Operation - - - - - - 17% 77% - - - - - - - - - - - - - - - - SERAPE(12KV) - Customers: 930 - - 1.0 8.4 0.1-46.1 0.3 0.1 - - - - - - - - - - - - - - - Equipment Failure - - 100% - - - 30% 47% 100% - - - - - - - - - - - - - - - Operation - - - 100% 100% - 70% 53% - - - - - - - - - - - - - - - - SNAKE(4.8KV) - Customers: 109 39.0 1.0-69.1 1.0 1.0 48.8 1.0 1.0 - - - - - - - - 1.0 - - - - - 1.0 Equipment Failure 100% 100% - - - - 100% 100% - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - 100% 100% - - - 100% - - - - - - - - 100% - - - - - 100% Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - SOBOBA(12KV) - Customers: 1,271 58.9 0.4-7.5 0.0-31.5 1.1 1.0 - - - - - - 4.9 0.0-1.1 0.0-6.0 0.0 - Equipment Failure 53% 38% - 30% 12% - 42% 3% 100% - - - - - - 79% 54% - - - - 64% 41% - Operation 47% 62% - 70% 88% - 10% 9% - - - - - - - 21% 46% - 100% 100% - 36% 59% - Other - - - - - - 48% 88% - - - - - - - - - - - - - - - - 23

Reliability Histories for Individual Circuits Serving Palm Desert - 10 of 12 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 SOMBRERO(12KV) - Customers: 787 40.3 1.1 1.0 511.6 1.0 0.2 35.3 0.2 - - - - - - - - - - - - - - - - Equipment Failure 100% 100% 100% 100% 100% 100% 56% 24% - - - - - - - - - - - - - - - - Operation - - - - - - 44% 76% - - - - - - - - - - - - - - - - TABERNA(12KV) - Customers: 1,871 89.3 1.0-16.1 0.2 - - - - - - - 7.6 0.0-33.7 1.1-0.4 0.0-41.7 1.1 - Equipment Failure 99% 100% - 85% 94% - - - - - - - 100% 100% - - - - - - - 18% 3% - Operation 1% 0% - 15% 6% - - - - - - - - - - 100% 100% - 100% 100% - 82% 97% - TAKOTA(12KV) - Customers: 858 4.8 0.1-104.4 1.0 0.6 92.0 1.8 1.5 - - - - - - 266.1 1.0 - - - - 266.1 1.0-3rd Party - - - - - - - - - - - - - - - 100% 100% - - - - 100% 100% - Equipment Failure 13% 5% - 96% 90% 100% 100% 100% 100% - - - - - - - - - - - - - - - Operation 69% 90% - 4% 10% - - - - - - - - - - - - - - - - - - - Other 18% 5% - - - - - - - - - - - - - - - - - - - - - - TANGLEWOOD(12KV) - Customers: 1,560 - - - 38.3 0.1 1.0 121.0 2.1 0.9 - - - - - - 51.4 1.0-3.6 0.0-55.0 1.0 - Equipment Failure - - - 61% 41% - 100% 100% 100% - - - - - - 100% 100% - 100% 100% - 100% 100% - Operation - - - 39% 59% - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - 24

Reliability Histories for Individual Circuits Serving Palm Desert - 11 of 12 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 TOLTEC(12KV) - Customers: 1,285 68.0 1.0 0.4 227.6 2.0 1.4 15.0 1.0 - - - - 87.2 1.4-104.1 1.6 - - - - 191.3 2.9 - Equipment Failure 100% 100% 100% 100% 100% 100% - - - - - - 88% 72% - 100% 100% - - - - 95% 87% - Operation - - - - - - - - - - - - 12% 28% - - - - - - - 5% 13% - Other - - - - - - 100% 100% - - - - - - - - - - - - - - - - TON(12KV) - Customers: 914 21.7 0.1-95.6 1.2 1.0 46.0 1.0-13.0 0.0-33.8 0.1 - - - - 3.0 0.0-49.7 0.2 - Equipment Failure 66% 21% - 17% 11% 1% 100% 100% - 95% 50% - 97% 73% - - - - 83% 89% - 96% 70% - Operation 34% 79% - 10% 3% - - - - 5% 50% - 3% 27% - - - - 17% 11% - 4% 30% - Other - - - 73% 86% - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - 99% - - - - - - - - - - - - - - - - - - TRAVIS(12KV) - Customers: 791 177.2 1.3 1.9 0.3 0.0 1.0 4.1 0.0 - - - - - - 2.0 - - - - - 1.0 - - 3.0 Equipment Failure 90% 89% 100% - - - 100% 100% - - - - - - - - - - - - - - - - Operation 9% 10% - 100% 100% - - - - - - - - - - - - - - - - - - - Other 1% 1% - - - - - - - - - - - - 100% - - - - - 100% - - 100% Vegetation/Animal - - - - - 100% - - - - - - - - - - - - - - - - - - TRIBAL(12KV) - Customers: 1,173 29.3 0.2 0.0 31.3 0.1 0.1 241.2 2.7 1.7 30.7 0.2-18.7 0.1 - - - - - - - 49.4 0.3 - Equipment Failure 90% 57% 100% 76% 42% - 84% 50% 40% 49% 15% - 99% 80% - - - - - - - 68% 28% - Operation 10% 43% - 24% 58% 100% 9% 13% - 51% 85% - 1% 20% - - - - - - - 32% 72% - Other - - - - - - 6% 37% 60% - - - - - - - - - - - - - - - 25

Reliability Histories for Individual Circuits Serving Palm Desert - 12 of 12 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 CircuitHistory12 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI WELCOME(4.8KV) - Customers: 376 - - - - - 2.0 397.8 2.0 1.0 - - - 400.0 1.0 1.0 - - - - - - 400.0 1.0 1.0 Equipment Failure - - - - - - 100% 100% - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - 100% 100% - - - - - - - 100% 100% - Other - - - - - 50% - - 100% - - - - - 100% - - - - - - - - 100% Vegetation/Animal - - - - - 50% - - - - - - - - - - - - - - - - - - 26