Circuit Reliability Review

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Kathleen Ferguson
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1 Circuit Reliability Review Desert Hot Springs 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

2 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 ( ). 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

3 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

4 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

5 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

6 * 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

7 Overview of Desert Hot Springs CircuitList1 There are 14 circuits that serve Desert Hot Springs 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers AVENTURA(12KV) 1, BLEND(12KV) 2, CAFE(12KV) 2, COACHELLA(33KV) ESPRESSO(12KV) 2, INVADER(12KV) KONA(12KV) 1, MAXIM(12KV) 2, PALMVIEW(33KV) ROVER(12KV) 1, SAN RAFAEL(12KV) 1, SKYBORNE(12KV) TOWNHALL(33KV) YUBAN(12KV) 1, Grand Total 17,397 7

Reliability History of Circuits Serving Desert Hot Springs (No Exclusions) BarChart 250.0 2014 2015 2016 2017 200.0 194.0 SAIDI (average minutes of sustained interruptions) 150.0 100.0 50.0 0.0 122.

8 Reliability History of Circuits Serving Desert Hot Springs (No Exclusions) BarChart SAIDI (average minutes of sustained interruptions) Desert Hot Springs SAIFI (average frequency of sustained interruptions) MAIFI (average frequency of momentary interruptions) 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

9 Causes of Repair Outages in Desert Hot Springs 2017 SAIDIChart Vegetation /Animal 0.0% 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 Other 18.5% Operation 15.0% Weather /Fire /Earthquake 10.7% 3rd Party 6.6% Equipment Failure 49.2% 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

10 Causes of Repair Outages in Desert Hot Springs 2017 SAIFIChart Vegetation /Animal 0.0% 3rd Party 3.5% Contributions to SAIFI by Outage Cause Equipment Failure e.g., in-service failure of transformer, switch, or conductors Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors Other e.g., patrolled but no cause found Operations e.g., urgent maintenance w/o 3-day notice 3 rd Party e.g., balloon, car hit pole, dig-in Other 15.9% Operation 18.2% Weather /Fire /Earthquake 8.7% Equipment Failure 53.6% 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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13 Back-up Slides Reliability Histories of Circuits Serving Desert Hot Springs Updated through Dec 2017

14 Average Reliability of 14 Circuits Serving Desert Hot Springs CitySummary st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI 14 Circuits Serving Desert Hot Springs -- Total Customers: 17, rd Party 25% 8% 18% 55% 52% 36% 4% 7% 6% 1% 1% - 12% 13% 7% 8% 1% % 7% 3% 13% Equipment Failure 25% 27% 14% 31% 31% 25% 64% 66% 15% 11% 20% 32% 75% 57% 36% 57% 64% 16% 15% 15% 32% 49% 54% 28% Operation 31% 29% 5% 4% 2% 3% 1% 1% 6% 84% 53% - 8% 20% - 5% 13% 0% 33% 29% 0% 15% 18% 0% Other 13% 34% 51% 3% 6% 23% 22% 13% 41% 3% 26% 68% 5% 10% 55% 12% 7% 12% 51% 56% 28% 18% 16% 34% Vegetation/Animal 0% 0% 9% % 5% 5% - 2% 1% Weather/Fire/Earthquake 6% 2% 3% 8% 9% 13% 9% 9% 27% % 14% 72% % 9% 25% SCE SYSTEMWIDE 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

15 Reliability Histories for Individual Circuits Serving Desert Hot Springs - 1 of st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI AVENTURA(12KV) - Customers: 1, CircuitHistory rd Party % 100% 33% % 4% 3% % 3% 2% 38% Equipment Failure 23% 0% - 4% 0% 67% 65% 80% 7% % 100% - 62% 65% 50% 3% 0% - 50% 49% 25% Operation % 0% - 10% 3% - 2% 1% - Other 77% 100% 71% % 20% 52% 100% 100% 100% % 97% - 18% 24% 12% Vegetation/Animal % - 21% Weather/Fire/Earthquake 21% % 32% 50% % 24% 25% BLEND(12KV) - Customers: 2, rd Party % 99% 99% % 64% - 21% 1% 17% 6% - Equipment Failure 0% 0% - 11% 0% - 41% 18% 31% 13% - 79% 99% 42% 85% - Operation 51% 91% - 1% 1% 1% 23% 37% - 100% 100% - 34% 24% % 6% - Other % 28% 100% - 100% % 100% - 16% 3% 100% Vegetation/Animal Weather/Fire/Earthquake 49% 9% 100% % 17% CAFE(12KV) - Customers: 2, rd Party % 99% 99% 52% % % 91% % 4% - Equipment Failure 1% 1% - 0% 0% - 81% 78% - 100% 100% - 24% 8% - 70% 96% - 100% 100% - 69% 92% - Operation 99% 99% - 0% 0% % 1% 13% 1% - Other % 1% 1% 48% % % 1% - 11% 2% 8% 2% - Vegetation/Animal Weather/Fire/Earthquake % 22% 56% COACHELLA(33KV) - Customers: rd Party Equipment Failure % 50% 100% % 100% 7% 22% - Operation - 7% 25% % % 11% 14% Other % % 59% 50% - 93% 75% 100% % % 100% - 89% 67% 43% Vegetation/Animal % 43% Weather/Fire/Earthquake 15

16 Reliability Histories for Individual Circuits Serving Desert Hot Springs - 2 of 4 CircuitHistory st Qtr nd Qtr rd Qtr th Qtr 2017 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI 2017 ESPRESSO(12KV) - Customers: 2, rd Party % 49% Equipment Failure 98% 96% - 20% 17% - 60% 51% 100% 100% - 100% 100% 99% 99% - Operation 2% 4% - 80% 83% - 1% 0% 56% 100% 100% - - 1% 1% - Other 44% % % Vegetation/Animal Weather/Fire/Earthquake INVADER(12KV) - Customers: rd Party % 3% 27% - 1% 1% 100% % 53% % 22% - Equipment Failure 24% 9% - 92% 39% 100% 97% 92% - 40% 50% 100% 13% 1% - 100% 100% - 33% 28% - 30% 19% 26% Operation 18% 70% 0% 5% - 60% 50% - 2% 1% % 4% - Other 57% 21% - 4% 33% - 1% 2% 27% 45% 100% % 72% 100% 51% 55% 74% Vegetation/Animal 1% 0% - - Weather/Fire/Earthquake KONA(12KV) - Customers: 1, rd Party 63% 65% 50% - - 3% 4% - 100% 0% 0% 5% Equipment Failure 36% 26% - 42% 7% - 50% 18% 100% 100% - 12% 25% - 0% 0% - 10% 28% - Operation 0% 9% - 54% 91% 29% 0% 0% - 97% 96% 14% 25% - 100% 100% - 44% 32% - Other % % 59% 100% - 100% 51% 25% 32% 20% 15% Vegetation/Animal Weather/Fire/Earthquake % 2% 71% 21% 23% % 25% 100% % 20% 80% MAXIM(12KV) - Customers: 2, rd Party Equipment Failure 5% 2% - 45% 62% - 68% 49% 57% % 100% - 100% 100% - 40% 27% 90% 91% 82% 82% Operation 69% 33% - 4% 1% - 4% 6% 1% 0% 57% 72% 0% 9% 18% 0% Other 25% 65% 100% 10% 1% - 28% 46% 43% % - - 3% 1% 10% 0% 0% 18% Vegetation/Animal Weather/Fire/Earthquake % 36% 100%

17 Reliability Histories for Individual Circuits Serving Desert Hot Springs - 3 of 4 CircuitHistory st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI PALMVIEW(33KV) - Customers: rd Party % 100% 33% - - Equipment Failure - 67% 85% 75% % 75% 50% % 43% 50% Operation - - 8% 33% - 3% 14% - Other 100% 100% 67% % 25% 100% - 92% 67% - 39% 29% - Vegetation/Animal % - Weather/Fire/Earthquake % 25% 50% % 14% 50% ROVER(12KV) - Customers: 1, rd Party % 100% 61% 5% - Equipment Failure 3% 6% - 74% 50% 100% 59% 89% 100% 100% % 93% - Operation % 26% 50% - 7% 7% - 100% 100% - - 5% 2% - Other % 4% Vegetation/Animal Weather/Fire/Earthquake 97% 94% - - SAN RAFAEL(12KV) - Customers: 1, rd Party 1% 1% - 57% 40% 33% 12% 5% Equipment Failure 43% 46% 50% 38% 57% % % 100% - 100% 100% 100% % 96% 14% Operation % 2% - 24% 63% - 100% 100% 0% 0% - 100% 100% - 1% 4% - Other 57% 53% 50% 1% 1% 67% % % Vegetation/Animal % 27% Weather/Fire/Earthquake % 5% SKYBORNE(12KV) - Customers: rd Party Equipment Failure % 50% 100% % 100% 30% 33% - Operation Other % % 60% 50% - 100% 100% 100% % % 100% - 70% 67% 75% Vegetation/Animal % 25% Weather/Fire/Earthquake 17

18 Reliability Histories for Individual Circuits Serving Desert Hot Springs - 4 of 4 CircuitHistory st Qtr nd Qtr rd Qtr th Qtr SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI TOWNHALL(33KV) - Customers: rd Party % 30% - 0% 3% Equipment Failure 95% 74% 21% - - 4% 27% 29% 74% - - 2% 16% 49% 100% 100% 3% 5% 19% 30% Operation 2% 3% 6% 3% % 8% 12% % 8% 7% Other 3% 23% 74% 61% 70% 73% 66% 66% 26% % % 46% 60% % 45% 58% 40% Vegetation/Animal Weather/Fire/Earthquake - - 5% % - 10% 16% 38% % 15% 23% YUBAN(12KV) - Customers: 1, rd Party 100% % Equipment Failure 98% 100% 100% - 6% 1% 75% 83% 57% 62% 39% 50% Operation 2% 0% - 100% 100% % 94% - 17% 43% 27% 59% - Other 40% 5% 25% % % 2% 33% Vegetation/Animal % 100% 100% Weather/Fire/Earthquake

Circuit Reliability Review

Circuit Reliability Review Indian Wells 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