Circuit Reliability Review

Circuit Reliability Review Corona 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 ONTARIO District CityList1 CHINO CHINO HILLS CORONA EASTVALE HOME GARDENS MIRA LOMA MONTCLAIR NORCO ONTARIO PEDLEY RIVERSIDE SAN ANTONIO HEIGHTS UPLAND 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 Corona CircuitList1 There are 63 circuits that serve Corona 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers ADELL(12KV) 1,433 LORNA(12KV) 2,234 WHISPER(12KV) 146 - ASTORIA(12KV) 802 MAGNOLIA(12KV) 1,949 WYLE(12KV) 1,734 - BIGGS(4.16KV) 74 MICHAEL(12KV) 690 YORBA(4.16KV) 518 - BLUE CREST(4.16KV) 172 MODELO(12KV) 1,826 - - BLUEMOON(12KV) 1,347 NEW CASTLE(12KV) 842 - - BOBBIT(12KV) 1,549 ONBORD(12KV) 1,345 - - BOHEMIA(12KV) 1,469 OWENS(33KV) 16 - - BOLLERO(12KV) 1,527 PACIFICA(12KV) 951 - - BORDER(12KV) 1,659 PALACE(12KV) 689 - - BROTHERTON(12KV) 2,029 PAPAYA(4.16KV) 213 - - CALIFORNIA(12KV) 1,587 PARKRIDGE(12KV) 1,325 - - CERAMIC(4.16KV) 375 PASEO(12KV) 2,721 - - CERRITO(12KV) 1,115 POLYMER(12KV) 27 - - CHIMAY(12KV) 1,109 PORCELAIN(4.16KV) 95 - - CONESTOGA(12KV) 1,171 PORPHYRY(33KV) 8 - - CORONITA(12KV) 2,412 PRICE(12KV) 460 - - CUPPLES(33KV) 4 PROMENADE(12KV) 662 - - DANA(12KV) 1,384 PULASKI(12KV) 289 - - DE MARI(4.16KV) 350 QUARRY(12KV) 1,434 - - DIPLOMAT(12KV) 1,021 RAMSGATE(12KV) 1,564 - - GLACIER(12KV) 1,123 ROULETTE(12KV) 861 - - GRIFFIN(12KV) 1,358 SAPPORO(12KV) 2,395 - - GUINNESS(12KV) 1,320 SERFAS(12KV) 114 - - HARLOW(12KV) 698 SHERIDAN(12KV) 1,964 - - INTERPACE(33KV) 8 TESORO(12KV) 2,823 - - JOY(4.16KV) 161 TIN MINE(12KV) 30 - - KINGSFORD(12KV) 894 TOLTON(12KV) 193 - - LAST(12KV) 1,338 VASSAL(12KV) 1,117 - - LESTER(12KV) 1,585 VICENTIA(12KV) 171 - - LISTON(12KV) 752 WEIRICK(12KV) 968 - - Grand Total 64,200 7

Reliability History of Circuits Serving Corona (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 134.5 139.7 129.6 112.1 114.8 107.3 111.8 95.0 Corona 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 1.0 0.9 0.9 0.6 1.4 1.4 0.6 0.7 0.8 1.1 1.1 1.6 1.3 1.0 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 Corona 2017 SAIDIChart Weather /Fire /Earthquake 7.2% Contributions to SAIDI by Outage Cause Vegetation /Animal 1.7% 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 Other 11.7% Operation 7.5% Equipment Failure 51.8% 3rd Party 20.0% 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 Corona 2017 SAIFIChart Weather /Fire /Earthquake 6.5% Contributions to SAIFI by Outage Cause Vegetation /Animal 2.6% Equipment Failure e.g., in-service failure of transformer, switch, or conductors Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors Other e.g., patrolled but no cause found Operations e.g., urgent maintenance w/o 3-day notice 3 rd Party e.g., balloon, car hit pole, dig-in Other 32.0% Operation 9.4% 3rd Party 15.6% Equipment Failure 33.9% 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 Corona Updated through Dec 2017

Average Reliability of 63 Circuits Serving Corona 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 63 Circuits Serving Corona -- Total Customers: 64,200 107.3 0.9 0.6 95.0 0.6 0.7 111.8 0.8 1.1 29.4 0.4 0.2 16.2 0.2 0.3 44.5 0.4 0.2 39.6 0.3 0.2 129.6 1.3 1.0 3rd Party 10% 15% 18% 14% 20% 27% 11% 7% 12% 18% 11% 18% 20% 15% 28% 0% 0% 8% 44% 47% 32% 20% 16% 22% Equipment Failure 52% 45% 15% 64% 38% 17% 38% 26% 18% 36% 19% 47% 59% 58% 44% 74% 42% 21% 36% 22% 17% 52% 34% 33% Operation 18% 26% 12% 15% 29% 1% 16% 12% 4% 7% 3% 13% 10% 12% 0% 4% 11% - 11% 14% - 8% 9% 3% Other 6% 5% 24% 5% 8% 30% 25% 38% 48% 28% 59% 5% 1% 0% 23% 14% 39% 47% 1% 9% 14% 12% 32% 23% Vegetation/Animal 8% 3% 2% - - - 0% 0% 5% 1% 0% 12% 11% 16% 5% - - 11% - - 6% 2% 3% 8% Weather/Fire/Earthquake 5% 6% 29% 3% 6% 24% 9% 16% 13% 11% 9% 4% - - - 7% 7% 13% 8% 8% 30% 7% 7% 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 Corona - 1 of 16 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 ADELL(12KV) - Customers: 1,433 6.6 0.1-53.4 0.2 - - - 1.0 - - CircuitHistory - - - - - - - - - - - - - 3rd Party - - - 8% 1% - - - - - - 1- - - - - - - - - - - - - Equipment Failure - - - 29% 48% - - - - - - - - - - - - - - - - - - - Operation 100% 100% - 63% 51% - - - - - - - - - - - - - - - - - - - Other - - - - - - - - 100% - - - - - - - - - - - - - - - ASTORIA(12KV) - Customers: 802 - - - 54.5 1.1 2.0 0.9 0.0 1.0 - - - 0.7 0.0 2.0 1.4 0.0-1.9 0.0-4.1 0.0 2.0 3rd Party - - - - - - 27% 9% - - - - - - 100% - - - - - - - - 100% Equipment Failure - - - 89% 95% 50% - - - - - - 100% 100% - 100% 100% - - - - 53% 63% - Operation - - - 11% 5% - 73% 91% - - - - - - - - - - 100% 100% - 47% 38% - Other - - - - - 50% - - 100% - - - - - - - - - - - - - - - BIGGS(4.16KV) - Customers: 74 - - - 169.5 1.1 4.0 186.7 2.0 1.0 94.1 1.0 1.0 142.2 2.0 1.0 35.0 0.0-709.5 5.0 1.0 980.9 8.0 3.0 3rd Party - - - - - 25% - - 100% 100% 100% - - - - - - - - - - 10% 12% - Equipment Failure - - - 100% 100% - 40% 49% - - - - 100% 99% - 100% 100% - 98% 80% 100% 89% 75% 32% Operation - - - - - - - - - - - - 0% 1% - - - - - - - 0% 0% - Other - - - - - 75% 60% 51% - - - 100% - - 100% - - - 2% 20% - 1% 13% 68% BLUE CREST(4.16KV) - Customers: 172 - - - 469.8 1.1 2.0 45.9 1.0 1.0 - - 2.0 122.7 2.1-64.6 1.0-441.3 3.0-628.6 6.1 2.0 3rd Party - - - - - - - - 100% - - 50% - - - - - - - - - - - 50% Equipment Failure - - - 96% 90% - 100% 100% - - - - 89% 93% - - - - 97% 67% - 85% 65% - Operation - - - 4% 10% - - - - - - - 11% 7% - 100% 100% - - - - 12% 19% - Other - - - - - 100% - - - - - 50% - - - - - - 3% 33% - 2% 16% 50% 15

Reliability Histories for Individual Circuits Serving Corona - 2 of 16 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 BLUEMOON(12KV) - Customers: 1,347 309.4 2.5 1.0 456.9 1.9 0.7 11.0 0.3 1.8 - - - - - - 5.4 0.0 - - - - 5.4 0.0-3rd Party 68% 46% 38% - - - - - - - - - - - - - - - - - - - - - Equipment Failure 30% 52% 62% 86% 58% 100% - - - - - - - - - - - - - - - - - - Operation 2% 2% - 14% 42% - 100% 100% - - - - - - - 100% 100% - - - - 100% 100% - Other - - - - - - - - 100% - - - - - - - - - - - - - - - BOBBIT(12KV) - Customers: 1,549 193.7 2.0-98.6 2.1 1.0 396.3 2.1 1.1 175.8 1.1-1.1 0.0-0.7 0.0 - - - - 177.6 1.1-3rd Party - - - 75% 52% - - - - 92% 93% - - - - - - - - - - 91% 92% - Equipment Failure 96% 97% - 15% 2% - 3% 2% - - - - 100% 100% - 100% 100% - - - - 1% 0% - Operation 4% 3% - 10% 47% - 1% 5% 100% 3% 4% - - - - - - - - - - 3% 3% - Other - - - - - 100% 91% 91% - 5% 4% - - - - - - - - - - 5% 4% - Weather/Fire/Earthquake - - - - - - 4% 2% - - - - - - - - - - - - - - - - BOHEMIA(12KV) - Customers: 1,469 130.1 1.4 2.0 17.2 0.1 1.0 112.4 1.0 - - - - - - - 50.3 2.0 - - - - 50.3 2.0 - Equipment Failure 21% 3% - 48% 28% 100% 31% 5% - - - - - - - 63% 2% - - - - 63% 2% - Operation 19% 8% - 52% 72% - - - - - - - - - - - - - - - - - - - Other - - - - - - 69% 95% - - - - - - - 37% 98% - - - - 37% 98% - Weather/Fire/Earthquake 59% 90% 100% - - - - - - - - - - - - - - - - - - - - - BOLLERO(12KV) - Customers: 1,527 454.0 3.4 0.6 91.3 0.3-73.5 0.1-66.8 0.1 0.8 - - 0.2 46.6 0.1 - - - - 113.4 0.2 0.9 3rd Party 16% 27% 32% - - - - - - - - - - - 100% - - - - - - - - 19% Equipment Failure 72% 67% 68% 98% 87% - 99% 83% - 97% 94% 98% - - - 100% 100% - - - - 98% 97% 79% Operation 12% 6% - 2% 13% - 1% 17% - 3% 6% 2% - - - - - - - - - 2% 3% 2% Other 0% 0% - - - - - - - - - - - - - - - - - - - - - - 16

Reliability Histories for Individual Circuits Serving Corona - 3 of 16 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 BORDER(12KV) - Customers: 1,659 6.9 0.1 3.9 75.8 1.4 6.8 17.3 0.4 4.9 - - 2.0 1.0 0.0 1.0 9.9 1.0 1.0 36.3 0.7 1.4 47.2 1.7 5.4 3rd Party - - 25% 60% 69% - 80% 94% 21% - - 50% - - - - - - 69% 90% 28% 53% 36% 26% Equipment Failure - - - - - - - - - - - - 100% 100% 100% - - - - - - 2% 0% 19% Operation 100% 100% - 40% 31% - 13% 4% - - - - - - - - - - - - - - - - Other - - 50% - - 14% 7% 2% 79% - - - - - - 100% 100% - - - - 21% 59% - Vegetation/Animal - - - - - - - - - - - 50% - - - - - 100% - - - - - 37% Weather/Fire/Earthquake - - 25% - - 86% - - - - - - - - - - - - 31% 10% 72% 24% 4% 18% BROTHERTON(12KV) - Customers: 2,029 3.2 0.0-43.6 1.1 0.0 51.0 1.2 1.0 120.1 2.0 0.1 - - - - - - - - - 120.1 2.0 0.1 Equipment Failure - - - 78% 95% - 65% 13% 0% 83% 50% 100% - - - - - - - - - 83% 50% 100% Operation 100% 100% - 22% 5% 100% - - - - - - - - - - - - - - - - - - Other - - - - - - - - - 17% 50% - - - - - - - - - - 17% 50% - Weather/Fire/Earthquake - - - - - - 35% 87% 100% - - - - - - - - - - - - - - - CALIFORNIA(12KV) - Customers: 1,587 111.2 1.2 1.6 21.1 0.1-33.7 0.2 - - - - - - - 8.5 0.0 - - - - 8.5 0.0 - Equipment Failure 84% 87% 100% - - - 58% 44% - - - - - - - 100% 100% - - - - 100% 100% - Operation 16% 13% - 100% 100% - 42% 56% - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - CERAMIC(4.16KV) - Customers: 375 165.9 2.0 3.0 207.8 2.0 2.0 1825.4 3.6 1.9 94.9 1.0-34.0 1.0-252.5 6.0-840.8 4.0-1222.2 12.0-3rd Party - - 33% - - - - - - 100% 100% - - - - - - - - - - 8% 8% - Equipment Failure - - - 55% 50% - 9% 31% - - - - 100% 100% - 13% 50% - 91% 75% - 68% 58% - Operation - - - - - - 89% 44% - - - - - - - - - - 9% 25% - 6% 8% - Other 100% 100% 67% - - 100% 2% 26% 50% - - - - - - 9% 17% - - - - 2% 8% - Weather/Fire/Earthquake - - - 45% 50% - - - 50% - - - - - - 78% 33% - - - - 16% 17% - 17

Reliability Histories for Individual Circuits Serving Corona - 4 of 16 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 CERRITO(12KV) - Customers: 1,115 317.4 3.1 1.8 5.6 0.1-67.3 0.7 0.7 19.1 0.1-0.5 0.0-251.0 1.2 - - - - 270.6 1.2 - Equipment Failure 29% 6% - - - - - - - 100% 100% - - - - 100% 100% - - - - 100% 100% - Operation 31% 89% 100% 100% 100% - 9% 7% - - - - 100% 100% - - - - - - - 0% 0% - Other 40% 5% - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 91% 93% 100% - - - - - - - - - - - - - - - CHIMAY(12KV) - Customers: 1,109 60.5 1.2 1.0 35.4 0.1-411.9 3.3 0.9 - - - 43.6 0.3 3.6 14.3 1.0 - - - 1.0 57.9 1.3 4.6 Equipment Failure 95% 91% 100% 38% 10% - 80% 67% 100% - - - 100% 100% 100% 100% 100% - - - 100% 100% 100% 100% Operation 5% 9% - 62% 90% - - - - - - - - - - - - - - - - - - - Other - - - - - - 20% 33% - - - - - - - - - - - - - - - - CONESTOGA(12KV) - Customers: 1,171 206.1 2.2 1.0 118.1 1.9 0.2 375.8 5.7 3.6 - - - 36.4 1.9 1.2 - - 1.1 182.9 1.0-219.3 2.9 2.3 3rd Party 13% 45% 100% - - - 60% 17% - - - - - - - - - - 100% 100% - 83% 34% - Equipment Failure 83% 53% - 1% 0% - 8% 3% - - - - 84% 52% - - - - - - - 14% 34% - Operation 3% 2% - 5% 4% - 25% 19% - - - - 2% 6% - - - - - - - 0% 4% - Other - - - 94% 96% 100% 6% 44% 44% - - - - - 83% - - 100% - - - - - 91% Vegetation/Animal - - - - - - - - 29% - - - 13% 42% 17% - - - - - - 2% 27% 9% Weather/Fire/Earthquake - - - - - - 2% 17% 27% - - - - - - - - - - - - - - - CORONITA(12KV) - Customers: 2,412 42.9 0.4-57.9 0.4-156.7 1.0 2.4 0.1 0.0 - - - - 22.6 0.1 - - - - 22.7 0.1 - Equipment Failure 79% 56% - 32% 12% - 95% 92% 54% - - - - - - 100% 100% - - - - 100% 99% - Operation 21% 44% - 68% 88% - 5% 8% 1% 100% 100% - - - - - - - - - - 0% 1% - Other - - - - - - - - 45% - - - - - - - - - - - - - - - 18

Reliability Histories for Individual Circuits Serving Corona - 5 of 16 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 CUPPLES(33KV) - Customers: 4 419.5 2.5 4.5 46.6 1.2 1.8 160.5 1.0 - - - - - - - 28.5 1.5-806.0 3.0 1.5 834.5 4.5 1.5 3rd Party 47% 80% 44% - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - 22% - - - - - - - - - - - - - - - 95% 67% 33% 92% 44% 33% Operation 53% 20% 11% - - - - - - - - - - - - 100% 100% - 5% 33% - 8% 56% - Other - - 22% 100% 100% 100% 100% 100% - - - - - - - - - - - - 67% - - 67% DANA(12KV) - Customers: 1,384 - - - 12.1 0.1-104.4 1.1 1.0 40.6 0.1 0.4 38.3 0.8-30.5 0.2 - - - - 109.3 1.2 0.4 Equipment Failure - - - - - - - - - - - - - - - 100% 100% - - - - 28% 18% - Operation - - - 100% 100% - 20% 7% - 100% 100% 100% 100% 100% - - - - - - - 72% 82% 100% Other - - - - - - 80% 93% 100% - - - - - - - - - - - - - - - DE MARI(4.16KV) - Customers: 350 15.9 1.0 - - - 1.0 - - - - - - - - - - - - - - - - - - 3rd Party 100% 100% - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - 100% - - - - - - - - - - - - - - - - - - DIPLOMAT(12KV) - Customers: 1,021 102.6 1.2-12.5 0.0-87.2 0.5 - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 100% 99% - - - - - - - - - - - - - - - - Operation 100% 100% - 100% 100% - 0% 1% - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - 19

Reliability Histories for Individual Circuits Serving Corona - 6 of 16 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 GLACIER(12KV) - Customers: 1,123 130.6 1.1 2.0 88.5 0.3-57.2 1.0-24.9 1.0-43.9 1.0-5.3 0.0 - - - - 74.2 2.0-3rd Party - - - - - - - - - - - - - - - 100% 100% - - - - 7% 2% - Equipment Failure 38% 5% - - - - 1% 0% - - - - 98% 99% - - - - - - - 58% 49% - Operation 60% 95% 50% 100% 100% - 2% 3% - - - - 2% 1% - - - - - - - 1% 0% - Other - - - - - - 97% 97% - 100% 100% - - - - - - - - - - 34% 49% - Weather/Fire/Earthquake 1% 0% 50% - - - - - - - - - - - - - - - - - - - - - GRIFFIN(12KV) - Customers: 1,358 640.3 2.6 0.7 64.1 1.9-6.9 0.0 4.0 106.9 0.8 0.2 4.1 0.1 - - - - - - - 111.0 0.9 0.2 Equipment Failure 14% 31% - 36% 5% - - - 50% - - - 100% 100% - - - - - - - 4% 7% - Operation 2% 3% - 22% 32% - 100% 100% - - - - - - - - - - - - - - - - Other - - - 11% 2% - - - 25% - - - - - - - - - - - - - - - Vegetation/Animal 85% 67% 100% - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - 31% 62% - - - 25% 100% 100% 100% - - - - - - - - - 96% 93% 100% GUINNESS(12KV) - Customers: 1,320 38.8 0.1 1.0 21.1 0.2-25.1 0.2 1.0 38.9 0.7 0.3 - - - - - - - - - 38.9 0.7 0.3 Equipment Failure 67% 25% - 62% 74% - - - - - - - - - - - - - - - - - - - Operation 33% 75% - 38% 26% - 100% 100% - 2% 1% - - - - - - - - - - 2% 1% - Other - - 100% - - - - - 100% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - - 98% 99% 100% - - - - - - - - - 98% 99% 100% HARLOW(12KV) - Customers: 698 4.8 0.0-0.9 0.0-196.3 1.1 - - - - 0.7 0.0-85.6 2.1-26.0 1.0 1.0 112.3 3.2 1.0 3rd Party - - - 100% 100% - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - - - - - - - - - - - - - 87% 53% - - - - 66% 36% - Operation - - - - - - 40% 10% - - - - 100% 100% - - - - - - - 1% 0% - Other - - - - - - 60% 90% - - - - - - - - - - 100% 100% - 23% 32% - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - 100% - - 100% Weather/Fire/Earthquake - - - - - - - - - - - - - - - 13% 47% - - - - 10% 32% - 20

Reliability Histories for Individual Circuits Serving Corona - 7 of 16 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 INTERPACE(33KV) - Customers: 8 - - 3.9 2779.6 3.0 2.0 735.3 2.6 4.1 95.0 1.0-114.0 2.0 1.0 296.0 5.0-177.5 2.0 1.0 682.5 10.0 2.0 3rd Party - - 26% 4% 33% - - - - 100% 100% - 70% 50% - - - - - - - 26% 20% - Equipment Failure - - - 4% 33% 50% 54% 16% - - - - 30% 50% 100% 11% 60% - 100% 100% 100% 36% 60% 100% Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - 48% 92% 33% 50% 19% 79% 73% - - - - - - 9% 20% - - - - 4% 10% - Vegetation/Animal - - 26% - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 27% 5% 27% - - - - - - 80% 20% - - - - 35% 10% - JOY(4.16KV) - Customers: 161 79.9 4.0 6.0 - - 2.0 - - 2.0 - - - - - - - - - - - - - - - 3rd Party 20% 25% - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 68% 50% 16% - - - - - - - - - - - - - - - - - - - - - Other - - - - - 100% - - 100% - - - - - - - - - - - - - - - Weather/Fire/Earthquake 11% 25% 84% - - - - - - - - - - - - - - - - - - - - - KINGSFORD(12KV) - Customers: 894 24.8 0.0-10.0 0.1 - - - 1.0 - - - 7.3 0.0 - - - - - - - 7.3 0.0-3rd Party - - - 4% 1% - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - - - - - - - - - - - - - - - - - - - - - - Operation - - - 96% 99% - - - - - - - 100% 100% - - - - - - - 100% 100% - Other - - - - - - - - 100% - - - - - - - - - - - - - - - LAST(12KV) - Customers: 1,338 135.8 1.1 0.0 109.0 1.2-78.7 1.0 - - - - 51.6 0.0-7.3 1.0-0.3 0.0-59.1 1.0-3rd Party - - - 83% 85% - - - - - - - - - - - - - - - - - - - Equipment Failure 99% 99% 100% - - - - - - - - - 100% 100% - - - - - - - 87% 4% - Operation 1% 1% - 17% 15% - 1% 1% - - - - - - - 100% 100% - 100% 100% - 13% 96% - Other - - - - - - 99% 99% - - - - - - - - - - - - - - - - 21

Reliability Histories for Individual Circuits Serving Corona - 8 of 16 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 LESTER(12KV) - Customers: 1,585 4.7 0.1-83.9 0.7 0.4 5.3 0.0 0.9 - - - 8.5 0.0-1.6 0.1 - - - - 10.0 0.1-3rd Party - - - 60% 84% 100% - - - - - - - - - - - - - - - - - - Equipment Failure - - - 31% 7% - - - - - - - 100% 100% - - - - - - - 85% 34% - Operation 100% 100% - 9% 9% - 100% 100% - - - - - - - 100% 100% - - - - 15% 66% - Other - - - - - - - - 100% - - - - - - - - - - - - - - - LISTON(12KV) - Customers: 752 3.2 0.0-43.5 0.2 2.0 0.3 0.0 1.0 - - - 144.1 1.6 1.0 - - - - - 1.0 144.1 1.6 2.0 Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 100% 100% - 100% 100% - 100% 100% - - - - 0% 0% - - - - - - - 0% 0% - Other - - - - - 100% - - 100% - - - - - - - - - - - 100% - - 51% Vegetation/Animal - - - - - - - - - - - - 100% 100% 100% - - - - - - 100% 100% 49% LORNA(12KV) - Customers: 2,234 11.8 0.1-471.5 1.7 2.0 82.1 1.0 2.0 90.1 0.4 0.9 - - - - - - 280.9 1.0-371.0 1.4 0.9 3rd Party - - - - - - - - 49% 5% 4% - - - - - - - 100% 100% - 77% 73% - Equipment Failure 20% 8% - 96% 93% 47% - - 51% 90% 86% 100% - - - - - - - - - 22% 25% 100% Operation 80% 92% - 3% 6% - - - - 5% 9% - - - - - - - - - - 1% 3% - Other - - - 0% 1% 53% 100% 100% - - - - - - - - - - - - - - - - MAGNOLIA(12KV) - Customers: 1,949 19.2 0.0-37.4 0.1 1.0 5.8 0.0 1.0 - - - - - - 17.7 0.1 - - - - 17.7 0.1-3rd Party - - - 67% 22% 100% - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - 80% 64% - - - - 80% 64% - Operation 2% 12% - 33% 78% - 100% 100% - - - - - - - 20% 36% - - - - 20% 36% - Other 98% 88% - - - - - - 100% - - - - - - - - - - - - - - - 22

Reliability Histories for Individual Circuits Serving Corona - 9 of 16 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 MICHAEL(12KV) - Customers: 690 48.9 0.3-53.9 0.2 1.0 14.9 0.6 1.0 192.7 2.3 2.5 - - - - - - 69.1 0.1-261.8 2.5 2.5 3rd Party 59% 63% - - - - - - - 17% 26% 16% - - - - - - - - - 12% 25% 16% Equipment Failure - - - - - - 100% 100% 100% 45% 26% 84% - - - - - - 94% 50% - 58% 27% 84% Operation 41% 37% - 94% 89% - - - - 8% 6% - - - - - - - 6% 50% - 8% 8% - Other - - - - - - - - - 31% 43% - - - - - - - - - - 22% 41% - Weather/Fire/Earthquake - - - 6% 11% 100% - - - - - - - - - - - - - - - - - - MODELO(12KV) - Customers: 1,826 202.7 2.1 2.0 39.1 1.1 2.0 24.5 0.1 3.0 - - - 2.4 0.0 1.0 77.6 1.1 1.0 81.7 0.9 0.2 161.7 1.9 2.2 3rd Party 1% 1% 50% 67% 10% 100% - - - - - - - - 100% - - - 100% 97% 100% 50% 44% 53% Equipment Failure 77% 49% - - - - 20% 12% - - - - 100% 100% - 98% 99% - - - - 49% 54% - Operation 22% 50% - 33% 90% - 47% 62% - - - - - - - 2% 1% - 0% 3% - 1% 2% - Other - - 50% - - - - - 32% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 32% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 33% 27% 37% - - - - - - - - 100% - - - - - 47% NEW CASTLE(12KV) - Customers: 842 78.4 1.2-17.3 0.1 0.9 11.5 0.0 1.0 7.0 1.0 1.0 - - - - - - 8.7 1.0-15.7 2.0 1.0 3rd Party 3% 1% - - - 100% - - - - - - - - - - - - 100% 100% - 55% 50% - Equipment Failure 37% 12% - 100% 100% - 100% 100% - 100% 100% 100% - - - - - - - - - 45% 50% 100% Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - 100% - - - - - - - - - - - - - - - Weather/Fire/Earthquake 60% 87% - - - - - - - - - - - - - - - - - - - - - - ONBORD(12KV) - Customers: 1,345 203.9 0.3 0.3 76.2 0.1 2.2 159.0 2.1 1.1 22.7 0.1 - - - - 330.4 1.0-47.8 0.3 1.0 401.0 1.4 1.0 3rd Party - - - - - 100% - - - - - - - - - - - - - - - - - - Equipment Failure 62% 34% 10% 96% 56% - 25% 1% 94% - - - - - - 100% 100% - 95% 83% 100% 94% 91% 100% Operation 15% 30% - 4% 44% - 17% 50% - - - - - - - - - - 3% 14% - 0% 3% - Other 16% 3% 80% - - - 55% 48% 5% - - - - - - - - - 2% 2% - 0% 1% - Vegetation/Animal 6% 34% 11% - - - - - - 89% 61% - - - - - - - - - - 5% 3% - Weather/Fire/Earthquake - - - - - - 2% 0% 1% 11% 39% - - - - - - - - - - 1% 2% - 23

Reliability Histories for Individual Circuits Serving Corona - 10 of 16 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 OWENS(33KV) - Customers: 16 358.8 1.5-383.3 2.1 3.8 278.3 2.6 1.0 - - 1.1 277.0 3.1 2.1 - - - 690.6 3.3 0.2 967.6 6.3 3.4 3rd Party - - - 44% 44% 21% - - 100% - - 6% - - - - - - - - - - - 2% Equipment Failure 87% 90% - 56% 56% - 26% 38% - - - - 100% 100% 26% - - - 98% 69% 100% 99% 84% 22% Operation - - - - - - 13% 24% - - - - - - - - - - - - - - - - Other 13% 10% - - - 79% 62% 38% - - - 94% - - 74% - - - 2% 31% - 1% 16% 76% PACIFICA(12KV) - Customers: 951 63.3 1.0-218.8 2.1 0.8 466.2 2.9 2.0 - - - - - - 17.9 0.0 1.0 - - - 17.9 0.0 1.0 3rd Party - - - - - - 10% 2% 50% - - - - - - - - - - - - - - - Equipment Failure - - - 65% 52% 100% 88% 69% - - - - - - - 100% 100% - - - - 100% 100% - Operation - - - - - - 2% 29% - - - - - - - - - - - - - - - - Other 100% 100% - 35% 48% - - - 50% - - - - - - - - 100% - - - - - 100% Weather/Fire/Earthquake - - - - - - 1% 0% - - - - - - - - - - - - - - - - PALACE(12KV) - Customers: 689 214.4 1.1-87.5 1.6 1.0 23.4 1.1 1.0 - - - - - - - - - 14.0 1.0 1.0 14.0 1.0 1.0 3rd Party - - - - - - - - - - - - - - - - - - - - 100% - - 100% Equipment Failure 100% 100% - 99% 98% - - - - - - - - - - - - - - - - - - - Operation - - - 1% 2% - 43% 5% - - - - - - - - - - 100% 100% - 100% 100% - Other - - - - - 100% - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 57% 95% 100% - - - - - - - - - - - - - - - PAPAYA(4.16KV) - Customers: 213 39.2 1.1 - - - - 122.0 1.0-107.8 1.0 - - - - 10.8 1.0-26.0 1.0 1.0 144.6 3.0 1.0 Equipment Failure 74% 5% - - - - - - - 100% 100% - - - - - - - - - - 75% 35% - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other 26% 95% - - - - 100% 100% - - - - - - - - - - 100% 100% - 18% 33% - Vegetation/Animal - - - - - - - - - - - - - - - - - - - - 100% - - 100% Weather/Fire/Earthquake - - - - - - - - - - - - - - - 100% 100% - - - - 7% 32% - 24

Reliability Histories for Individual Circuits Serving Corona - 11 of 16 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 PARKRIDGE(12KV) - Customers: 1,325 246.6 0.8 1.7 142.6 1.1-42.8 0.0-31.2 1.0 1.0 13.6 0.1-31.5 0.2 - - - 2.0 76.3 1.3 3.0 3rd Party - - - 84% 92% - - - - - - - - - - - - - - - 50% - - 33% Equipment Failure 81% 84% 33% 13% 4% - - - - 33% 1% - - - - 100% 100% - - - - 55% 16% - Operation 19% 16% - 2% 4% - - - - - - 100% 100% 100% - - - - - - - 18% 6% 33% Other - - 67% - - - 100% 100% - 67% 99% - - - - - - - - - 50% 27% 78% 33% PASEO(12KV) - Customers: 2,721 67.3 0.3-1.4 0.0-225.2 0.5-22.2 1.0 - - - - 94.4 1.8 - - - - 116.6 2.8 - Equipment Failure 100% 100% - - - - 100% 100% - - - - - - - 15% 2% - - - - 12% 1% - Operation - - - 100% 100% - - - - 5% 0% - - - - 1% 0% - - - - 2% 0% - Other - - - - - - - - - 95% 100% - - - - 84% 98% - - - - 86% 99% - POLYMER(12KV) - Customers: 27 45.4 0.1 1.2 469.6 2.0 2.6 46.8 1.0 1.0 97.7 1.0-33.7 1.0-255.4 5.9-1019.5 5.0-1406.3 12.9-3rd Party - - 100% 76% 50% 24% - - - 100% 100% - - - - - - - - - - 7% 8% - Equipment Failure - - - 24% 50% - - - - - - - 100% 100% - 13% 50% - 93% 80% - 72% 62% - Operation - - - - - - - - - - - - - - - - - - 7% 20% - 5% 8% - Other 100% 100% - - - 76% 100% 100% - - - - - - - 9% 17% - - - - 2% 8% - Weather/Fire/Earthquake - - - - - - - - 100% - - - - - - 78% 33% - - - - 14% 15% - PORCELAIN(4.16KV) - Customers: 95 39.9 1.1 0.9 216.0 2.0 4.9 49.0 1.0 4.0 94.7 1.0-55.2 1.0-268.1 6.0-827.9 3.9-1245.9 11.9-3rd Party - - 100% - - - - - - 100% 100% - - - - - - - - - - 8% 8% - Equipment Failure - - - 100% 100% - - - - - - - 100% 100% - 18% 50% - 91% 75% - 69% 59% - Operation - - - - - - - - - - - - - - - - - - 9% 25% - 6% 8% - Other 100% 100% - - - 100% 100% 100% 75% - - - - - - 8% 17% - - - - 2% 8% - Weather/Fire/Earthquake - - - - - - - - 25% - - - - - - 73% 33% - - - - 16% 17% - 25

Reliability Histories for Individual Circuits Serving Corona - 12 of 16 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 PORPHYRY(33KV) - Customers: 8 - - - - - 5.8 432.9 1.4 - - - - - - - - - - - - - - - - Equipment Failure - - - - - 65% 19% 73% - - - - - - - - - - - - - - - - Operation - - - - - - 81% 27% - - - - - - - - - - - - - - - - Other - - - - - 35% - - - - - - - - - - - - - - - - - - PRICE(12KV) - Customers: 460 72.3 0.9-42.0 0.2 - - - - 49.9 1.0 - - - - 30.2 0.2 - - - - 80.1 1.2-3rd Party 38% 9% - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - 100% 100% - - - - - - - - - - 100% 100% - - - - 38% 17% - Operation 62% 91% - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - 100% 100% - - - - - - - - - - 62% 83% - PROMENADE(12KV) - Customers: 662 130.5 1.7 1.5 99.1 1.3 - - - - 62.4 0.9 - - - - 151.8 3.7 1.2 - - - 214.2 4.5 1.2 3rd Party - - - 43% 79% - - - - - - - - - - - - 100% - - - - - 100% Equipment Failure - - - - - - - - - - - - - - - 56% 37% - - - - 40% 30% - Operation 100% 100% 100% 57% 21% - - - - - - - - - - 44% 63% - - - - 31% 51% - Other - - - - - - - - - 100% 100% - - - - - - - - - - 29% 19% - PULASKI(12KV) - Customers: 289 36.2 0.1 1.0 342.0 0.3-202.4 1.1-91.4 1.1 2.0 18.9 0.1-56.6 0.1-47.5 1.1 1.0 214.3 2.4 3.0 3rd Party - - - 100% 100% - - - - - - - - - - - - - 87% 11% 100% 19% 5% 33% Equipment Failure - - - - - - 89% 89% - 27% 5% 100% - - - 100% 100% - - - - 38% 8% 67% Operation 100% 100% 100% - - - 1% 0% - 4% 2% - - - - - - - 13% 89% - 4% 42% - Other - - - - - - 10% 11% - 69% 93% - 100% 100% - - - - - - - 38% 46% - 26

Reliability Histories for Individual Circuits Serving Corona - 13 of 16 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 CircuitHistory13 SAIFI MAIFI SAIDI SAIFI MAIFI QUARRY(12KV) - Customers: 1,434 7.6 0.0-28.3 0.1-30.4 0.0-40.2 0.1-97.6 1.0 1.0 93.0 1.0-152.9 1.2 2.0 383.7 3.3 3.0 3rd Party - - - - - - 97% 84% - - - - - - - - - - - - - - - - Equipment Failure 23% 2% - 91% 65% - - - - 100% 100% - 100% 100% 100% - - - 19% 17% - 44% 39% 33% Operation 77% 98% - 9% 35% - 3% 16% - - - - - - - - - - 2% 1% - 1% 0% - Other - - - - - - - - - - - - - - - 100% 100% - - - - 24% 30% - Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - 79% 81% 100% 31% 30% 67% RAMSGATE(12KV) - Customers: 1,564 56.7 1.1-6.8 0.0-21.5 0.1 0.1 - - - 5.8 0.0-0.5 0.0 - - - - 6.2 0.0 - Equipment Failure 81% 93% - - - - 53% 17% - - - - - - - - - - - - - - - - Operation 19% 7% - 100% 100% - 31% 73% 100% - - - 100% 100% - 100% 100% - - - - 100% 100% - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - 16% 10% - - - - - - - - - - - - - - - - ROULETTE(12KV) - Customers: 861 8.8 0.4-61.9 1.5-349.0 2.1 1.8 151.6 1.0 - - - - - - - - - - 151.6 1.0-3rd Party 29% 96% - - - - 86% 95% 53% - - - - - - - - - - - - - - - Equipment Failure 71% 4% - - - - 10% 1% - - - - - - - - - - - - - - - - Operation - - - 100% 100% - 4% 4% 47% 5% 2% - - - - - - - - - - 5% 2% - Other - - - - - - - - - 95% 98% - - - - - - - - - - 95% 98% - SAPPORO(12KV) - Customers: 2,395 85.6 1.0 - - - - 217.1 1.7 0.5 - - - - - - - - 1.0 - - - - - 1.0 3rd Party 95% 98% - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 59% 40% 100% - - - - - - - - - - - - - - - Operation 5% 2% - - - - 1% 0% - - - - - - - - - - - - - - - - Other - - - - - - 40% 59% - - - - - - - - - 100% - - - - - 100% 27

Reliability Histories for Individual Circuits Serving Corona - 14 of 16 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 CircuitHistory14 SAIFI MAIFI SAIDI SAIFI MAIFI SERFAS(12KV) - Customers: 114 - - - - - - - - - 90.2 1.0 - - - - - - - - - - 90.2 1.0 - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - 100% 100% - - - - - - - - - - 100% 100% - SHERIDAN(12KV) - Customers: 1,964 34.8 0.2-33.8 0.1-99.9 0.2 0.9 11.7 0.1 0.2 2.0 0.0-369.9 1.0 1.5 - - - 383.5 1.1 1.7 3rd Party - - - - - - 83% 41% 100% - - - - - - - - - - - - - - - Equipment Failure - - - 100% 100% - 15% 54% - 6% 1% 100% - - - 100% 100% 100% - - - 97% 91% 100% Operation 100% 100% - - - - 2% 4% - 94% 99% - 100% 100% - - - - - - - 3% 9% - Other - - - - - - - - - - - - - - - - - - - - - - - - TESORO(12KV) - Customers: 2,823 177.8 1.0-0.1 0.0-0.1 0.0 1.0 21.2 1.0-0.3 0.0-0.5 0.0-0.6 0.0-22.5 1.0 - Equipment Failure 100% 100% - - - - - - - - - - - - - - - - - - - - - - Operation - - - 100% 100% - 100% 100% - - - - 100% 100% - 100% 100% - 100% 100% - 6% 2% - Other - - - - - - - - 100% 100% 100% - - - - - - - - - - 94% 98% - TIN MINE(12KV) - Customers: 30 296.2 0.9 5.1 1821.2 2.0 5.0 963.1 2.8 4.3 - - 1.0 125.8 0.3 4.0 3265.0 1.0 3.9 18.8 0.9 1.0 3409.6 2.3 9.9 3rd Party - - 39% - - 40% - - - - - 100% - - 25% - - - - - - - - 20% Equipment Failure 15% 3% - - - 40% 55% 19% 6% - - - - - 50% - - 74% 100% 100% 100% 1% 41% 60% Operation 85% 97% 3% 7% 50% - 2% 2% - - - - 100% 100% 24% - - - - - - 4% 14% 10% Other - - 39% 93% 50% 20% 35% 43% 78% - - - - - - - - 26% - - - - - 10% Vegetation/Animal - - 19% - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 8% 35% 16% - - - - - - 100% 100% - - - - 96% 45% - 28

Reliability Histories for Individual Circuits Serving Corona - 15 of 16 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 CircuitHistory15 SAIFI MAIFI SAIDI SAIFI MAIFI TOLTON(12KV) - Customers: 193 62.5 0.1 - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation 100% 100% - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - VASSAL(12KV) - Customers: 1,117 774.6 4.0 2.7 4.6 0.0 - - - - 20.7 1.0-214.4 2.6 4.3 - - 2.0 204.7 0.8-439.8 4.4 6.3 3rd Party 10% 49% 72% - - - - - - - - - 89% 69% 31% - - - - - - 43% 41% 21% Equipment Failure - - - - - - - - - - - - 11% 31% 22% - - - - - - 6% 19% 15% Operation 12% 26% - 100% 100% - - - - - - - - - - - - - 100% 100% - 47% 17% - Other - - - - - - - - - 100% 100% - - - 46% - - 100% - - - 5% 23% 63% Weather/Fire/Earthquake 78% 26% 28% - - - - - - - - - - - - - - - - - - - - - VICENTIA(12KV) - Customers: 171 - - - 3.9 0.0-14.4 0.0-146.2 1.0 - - - - - - - 3.9 0.1-150.1 1.1 - Equipment Failure - - - 100% 100% - - - - - - - - - - - - - - - - - - - Operation - - - - - - 100% 100% - - - - - - - - - - 100% 100% - 3% 11% - Other - - - - - - - - - 100% 100% - - - - - - - - - - 97% 89% - WEIRICK(12KV) - Customers: 968 1.9 0.0-7.6 0.1 1.0 - - - - - - - - 1.0 0.2 0.0 - - - - 0.2 0.0 1.0 3rd Party - - - 100% 100% 100% - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - - - - - - - - - - - - - 100% 100% - - - - 100% 100% - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - 100% - - - - - - - - 100% 29

Reliability Histories for Individual Circuits Serving Corona - 16 of 16 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th Qtr 2017 2017 CircuitHistory16 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI WHISPER(12KV) - Customers: 146 3.4 0.0 - - - - 573.9 4.3 0.9 - - - - - - - - - 102.9 1.0 0.1 102.9 1.0 0.1 Equipment Failure - - - - - - 25% 44% 100% - - - - - - - - - 100% 100% 100% 100% 100% 100% Operation 100% 100% - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 75% 56% - - - - - - - - - - - - - - - - WYLE(12KV) - Customers: 1,734 5.0 0.3 2.0 363.1 0.6 0.4 276.0 2.1 - - - - 59.7 0.4-18.7 0.0-34.8 1.1 0.9 113.2 1.5 0.9 3rd Party - - - - - - - - - - - - - - - - - - 100% 100% 100% 31% 71% 100% Equipment Failure - - - 98% 95% 100% 1% 0% - - - - 100% 100% - - - - - - - 53% 25% - Operation 68% 94% - 2% 5% - 9% 5% - - - - - - - 100% 100% - - - - 16% 3% - Other - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 32% 6% 100% - - - 90% 94% - - - - - - - - - - - - - - - - YORBA(4.16KV) - Customers: 518 348.5 1.0-913.1 3.1 3.0 45.5 1.0 1.0 - - 2.0 108.6 2.0-9.7 0.0 1.0 443.9 3.0-562.2 5.0 3.0 3rd Party - - - - - - - - 100% - - 50% - - - 3% 22% 100% - - - 0% 0% 67% Equipment Failure - - - 72% 66% - 100% 100% - - - - 100% 100% - 97% 78% - 97% 67% - 97% 80% - Operation 100% 100% - 0% 3% 33% - - - - - - - - - - - - 0% 0% - 0% 0% - Other - - - - - 67% - - - - - 50% - - - - - - 3% 33% - 2% 20% 33% Weather/Fire/Earthquake - - - 28% 31% - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30