Circuit Reliability Review

Transcription

1 Circuit Reliability Review Visalia January 2018

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 SAN JOAQUIN District CityList1 ARMONA COUNTY OF TULARE DELANO DUCOR EARLIMART EAST PORTERVILLE EXETER FARMERSVILLE GOSHEN HANFORD IVANHOE KINGS COUNTY LEMON COVE LINDSAY MCFARLAND PIXLEY POPLAR-COTTON CENTER PORTERVILLE RICHGROVE SPRINGVILLE STRATHMORE TERRA BELLA THREE RIVERS TIPTON VISALIA WOODLAKE WOODVILLE CITY OF TULARE TULE RIVER INDIAN TRIBE 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 Visalia CircuitList1 There are 46 circuits that serve Visalia 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers ALLEGIANCE(12KV) 1,361 PACKWOOD(12KV) 2, AMERICAN(12KV) 1,839 RASMUSSEN(12KV) BLACKSTONE(12KV) 1,942 RIO GRANDE(12KV) 2, BUSH(12KV) 1,630 ROYAL OAKS(12KV) CALDWELL(12KV) 1,468 SHIRK(12KV) 1, CHINOWTH(12KV) 1,744 SUSQUEHANNA(12KV) 2, CLANCY(12KV) 155 SWOOSE(12KV) CREE(12KV) 97 TAGUS(12KV) CRESTWOOD(12KV) 1,228 TAYLOR(12KV) 1, CUTLER(12KV) 1,571 TLSMITH(12KV) DE CAMP(12KV) 1,435 VOLNEY(12KV) 1, DEMAREE(12KV) 1,271 WEBB(12KV) DIAMANTE(12KV) 1,359 WHITENDALE(12KV) 1, EFFIE(12KV) 26 WOODLAND(12KV) 1, ELOWIN(12KV) 1,670 WUTCHUMNA(12KV) 1, FREEDOM(12KV) 1,361 YELLOWSTONE(12KV) 2, GARCIA(12KV) 1, GIDDINGS(12KV) GILA(12KV) 1, GORDON(12KV) 2, HARRELL(12KV) 1, HIGBY(12KV) 1, LEO(12KV) 2, LINNELL(12KV) 1, LOWRY(12KV) MID VALLE(12KV) 1, MINERAL(12KV) 1, MINUTEMAN(12KV) MISSISSIPPI(12KV) 1, MONSON(12KV) Grand Total 58,571 7

8 Reliability History of Circuits Serving Visalia (No Exclusions) BarChart SAIDI (average minutes of sustained interruptions) Visalia 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 Visalia 2017 SAIDIChart Weather /Fire /Earthquake 11.3% 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 5.5% Other 32.1% Operation 9.3% 3rd Party 17.0% Equipment Failure 24.9% 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 Visalia 2017 SAIFIChart Contributions to SAIFI by Outage Cause Vegetation /Animal 3.0% Weather /Fire /Earthquake 6.1% 3rd Party 15.3% 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 51.6% Equipment Failure 17.3% Operation 6.7% 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 Visalia Updated through Dec 2017

14 Average Reliability of 46 Circuits Serving Visalia 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 46 Circuits Serving Visalia -- Total Customers: 58, rd Party 21% 27% 16% 27% 27% 27% 19% 36% 34% 38% 32% 32% 18% 27% 48% 23% 33% 41% 8% 3% 29% 17% 15% 39% Equipment Failure 58% 50% 16% 35% 29% 15% 54% 32% 17% 23% 18% - 64% 59% 20% 31% 32% 15% 6% 4% 24% 25% 17% 16% Operation 4% 9% 2% 12% 17% 16% 11% 10% - 6% 16% 2% 12% 12% 3% 10% 9% - 9% 3% - 9% 7% 1% Other 3% 4% 13% 4% 3% 15% 9% 14% 18% 1% 1% - 4% 2% 20% 3% 7% 2% 68% 88% 39% 32% 52% 16% Vegetation/Animal 3% 5% 45% 10% 9% 23% 7% 8% 30% % 9% 35% 8% 2% 8% 6% 3% 11% Weather/Fire/Earthquake 12% 4% 8% 12% 15% 4% 0% 0% 1% 32% 33% 67% 2% 1% 8% 27% 10% 7% 0% 0% - 11% 6% 16% 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 Visalia - 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 ALLEGIANCE(12KV) - Customers: 1, CircuitHistory rd Party 65% 94% Equipment Failure 4% 2% - 0% 0% % 59% % 0% - 12% 3% - Operation % 0% - 100% 100% - 9% 11% % 13% - 18% 12% - Other % 89% % 87% - 56% 84% - Vegetation/Animal % 42% 31% 100% % Weather/Fire/Earthquake 31% 4% - 56% 69% % 41% % 2% - AMERICAN(12KV) - Customers: 1, rd Party % Equipment Failure 99% 98% % 100% 100% % 100% 100% Operation % 29% Other % 57% Vegetation/Animal 1% 2% 50% % 15% 42% Weather/Fire/Earthquake % BLACKSTONE(12KV) - Customers: 1, rd Party % 88% 100% Equipment Failure 99% 100% - 22% 4% - 37% 49% Operation 1% 0% - 6% 4% - 52% 26% Other % 2% - 11% 25% % 100% 100% 100% 100% 100% Vegetation/Animal % 2% BUSH(12KV) - Customers: 1, rd Party Equipment Failure % 50% 100% 44% 56% % 65% % 7% - Operation 71% 89% 100% 21% 50% - 56% 44% % 35% % 4% - Other 22% 8% % 100% - 63% 89% - Weather/Fire/Earthquake 7% 2%

16 Reliability Histories for Individual Circuits Serving Visalia - 2 of 12 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 CALDWELL(12KV) - Customers: 1, rd Party 100% 100% - 98% 78% 17% 32% 23% 17% 63% 34% 12% % 21% 12% Equipment Failure % Operation % 22% 42% % 100% % 0% - 2% 0% - Other % 77% 83% % 100% - 15% 37% - Weather/Fire/Earthquake % 66% 88% % 41% 88% CHINOWTH(12KV) - Customers: 1, rd Party % % 100% 100% 17% 50% % 51% 100% Equipment Failure 100% 100% - 1% 0% Operation % 100% % 50% % 0% - Other % 100% - 79% 49% - CLANCY(12KV) - Customers: rd Party % 54% 27% 27% 51% 100% Equipment Failure 93% 33% 25% 37% 16% 8% 5% 2% % 100% % 96% - Operation 7% 67% - 14% 14% - 68% 47% - 100% 100% 100% % 4% 49% Other % % % Vegetation/Animal % % Weather/Fire/Earthquake % 25% 16% CREE(12KV) - Customers: rd Party Equipment Failure 100% 100% - 99% 98% 15% 100% 100% Operation % 2% Other % % Vegetation/Animal % %

17 Reliability Histories for Individual Circuits Serving Visalia - 3 of 12 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 CRESTWOOD(12KV) - Customers: 1, rd Party Equipment Failure 99% 90% 13% 100% 100% - 75% 50% 47% % 64% % 12% - Operation 1% 10% % 36% % 7% - Other % 50% % 100% - 52% 81% - Vegetation/Animal % % CUTLER(12KV) - Customers: 1, rd Party % 15% 52% % Equipment Failure 92% 98% - 4% 3% - 69% 30% % 100% - 65% 77% 100% 10% 6% - 57% 38% 28% Operation 1% 1% - 80% 82% 48% 25% 60% % 23% % 9% - Other % 11% % % 94% 100% 18% 54% 72% Weather/Fire/Earthquake 8% 1% 100% DE CAMP(12KV) - Customers: 1, rd Party Equipment Failure 100% 100% 6% % 100% % 100% - 93% 97% 100% % 97% 28% Operation % 87% % 3% % 3% - Other % 13% % % Vegetation/Animal % % DEMAREE(12KV) - Customers: 1, rd Party Equipment Failure % 100% - 100% 100% Operation Other Vegetation/Animal % %

18 Reliability Histories for Individual Circuits Serving Visalia - 4 of 12 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 DIAMANTE(12KV) - Customers: 1, rd Party Equipment Failure 94% 66% 100% 100% 100% % 85% % 6% - Operation 6% 34% % 100% % 15% % 9% - 18% 9% - Other % 91% - 56% 84% - Vegetation/Animal % EFFIE(12KV) - Customers: rd Party 100% 100% Equipment Failure Operation Other % % Vegetation/Animal % % ELOWIN(12KV) - Customers: 1, rd Party % 73% 50% Equipment Failure 87% 46% - 33% 4% - 96% 69% - 100% 100% % 100% % 99% - Operation 1% 30% - 36% 20% - 4% 31% Other % 2% Vegetation/Animal 12% 24% 100% % Weather/Fire/Earthquake % 100% 100% % 1% 100% FREEDOM(12KV) - Customers: 1, rd Party % % 67% % 0% - Equipment Failure 99% 99% - 32% 7% - 99% 98% % 33% % 0% - Operation 1% 1% % 2% % 4% - 1% 4% - Other % 95% - 94% 95% - Vegetation/Animal % % Weather/Fire/Earthquake % 93% 100% % 0% - 2% 0% - 18

19 Reliability Histories for Individual Circuits Serving Visalia - 5 of 12 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 GARCIA(12KV) - Customers: 1, rd Party % 11% Equipment Failure 96% 98% % 58% 17% % 100% - 96% 98% % 50% - Operation 4% 2% - 48% 89% 100% % 2% % 1% - Other % 100% - 44% 49% - Vegetation/Animal % 42% 83% GIDDINGS(12KV) - Customers: rd Party % 38% Equipment Failure % 31% 100% % 100% 100% % 38% 100% 71% 60% 100% Operation Other % % 62% - 29% 40% - Vegetation/Animal % 31% GILA(12KV) - Customers: 1, rd Party % 14% 53% Equipment Failure 57% 1% - 41% 16% % 9% % 100% - 39% 18% - Operation 43% 99% Other % 100% Vegetation/Animal % 68% 47% % 100% % 1% - Weather/Fire/Earthquake % 1% % 91% 100% % 81% 100% GORDON(12KV) - Customers: 2, rd Party % 100% 100% % 7% 58% 45% 7% 58% Equipment Failure % 67% % % Operation 100% 100% % 33% Other % 93% - 55% 93% - 19

20 Reliability Histories for Individual Circuits Serving Visalia - 6 of 12 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 HARRELL(12KV) - Customers: 1, rd Party 92% 63% % 44% 60% % 35% 42% Equipment Failure 1% 0% - 72% 83% 10% % 56% % 100% 100% 75% 65% 29% Operation 8% 37% 12% 1% 1% - 100% 100% - 100% 100% % % 0% 29% Other % 5% 11% 44% % Vegetation/Animal % Weather/Fire/Earthquake % 6% 23% HIGBY(12KV) - Customers: 1, rd Party 35% 51% % 100% - 100% 100% 100% 75% 89% 67% 9% 9% - 65% 63% 76% Equipment Failure 40% 8% 19% 89% 89% 100% 97% 99% 56% % 2% - 12% 9% - 11% 4% - Operation 4% 4% 20% 0% 0% - 3% 1% % 1% % 0% - Other % 6% 6% % % 81% - 13% 27% - Vegetation/Animal 20% 38% 34% % Weather/Fire/Earthquake % 4% % 9% 33% % 5% 24% LEO(12KV) - Customers: 2, rd Party % 96% Equipment Failure 100% 100% 100% 99% 98% 100% 29% 2% Operation % 2% - 4% 2% % 100% - 56% 16% - 56% 23% - Other % % 84% - 44% 77% 100% LINNELL(12KV) - Customers: 1, rd Party 55% 88% - 49% 48% 25% 17% 24% 50% % 3% - 30% 3% - Equipment Failure 20% 3% - 1% 0% 25% 0% 1% Operation % 4% 25% 2% 0% - 100% 100% % 5% - Other % % % 100% % 97% - 60% 93% - Vegetation/Animal % 48% - 81% 75% Weather/Fire/Earthquake 25% 9% - 4% 0% %

21 Reliability Histories for Individual Circuits Serving Visalia - 7 of 12 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 LOWRY(12KV) - Customers: rd Party Equipment Failure 63% 42% 24% 88% 80% Operation % 19% - 100% 100% Other % % Vegetation/Animal 37% 58% 76% 8% 1% 100% MID VALLE(12KV) - Customers: 1, rd Party % 73% 67% % 28% 100% 31% 22% 100% Equipment Failure 100% 100% 100% 49% 26% - 100% 100% % 0% % 0% - Operation % 100% % 22% - Other % % 100% % 72% - 62% 57% - Weather/Fire/Earthquake % 1% MINERAL(12KV) - Customers: 1, rd Party % 9% 50% Equipment Failure 100% 100% 100% 33% 91% - 100% 100% Operation % % 50% % 30% - Other % 50% 21% 100% 100% - 85% 70% 21% Vegetation/Animal % % MINUTEMAN(12KV) - Customers: rd Party 100% 100% Equipment Failure Operation % 43% - 80% 64% Other % % 100% - 100% 100% - Weather/Fire/Earthquake % 57% - 20% 36%

22 Reliability Histories for Individual Circuits Serving Visalia - 8 of 12 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 MISSISSIPPI(12KV) - Customers: 1, rd Party % 40% % 97% % % 7% 73% Equipment Failure 15% 55% 33% % 20% % 3% - 100% 100% % 1% - Operation 0% 0% - 100% 100% - 3% 3% Other 1% 0% % 25% 100% Weather/Fire/Earthquake 85% 44% 67% % 13% - 100% 100% 100% % 100% - 36% 92% 27% MONSON(12KV) - Customers: rd Party % 49% Equipment Failure % 82% 68% 53% 49% Operation % 0% - 11% 2% Other Vegetation/Animal 100% 100% 100% 21% 18% 32% PACKWOOD(12KV) - Customers: 2, rd Party 99% 100% 100% % 93% 100% Equipment Failure % 4% Operation 1% 0% - 100% 100% - 12% 4% Other % 100% - 100% 100% - RASMUSSEN(12KV) - Customers: rd Party % 95% 100% Equipment Failure 100% 100% 29% % 2% Operation % 3% % 100% % 100% - Other % % Vegetation/Animal % %

23 Reliability Histories for Individual Circuits Serving Visalia - 9 of 12 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 RIO GRANDE(12KV) - Customers: 2, rd Party % 100% 63% 100% 100% 100% Equipment Failure 67% 29% 100% Operation 33% 71% % % 100% - 0% 1% % 100% - 33% 44% - Other % 99% 100% % 4% 3% Vegetation/Animal % 100% 100% % 52% 97% ROYAL OAKS(12KV) - Customers: rd Party % % Equipment Failure 45% 6% - 100% 100% - 100% 100% % 3% - 15% 3% - Operation 55% 94% Other % 97% - 85% 97% - SHIRK(12KV) - Customers: 1, rd Party % Equipment Failure % 100% 46% 87% 55% Operation % 45% - 100% 100% - 100% 100% % 1% - Other % % 100% - 13% 36% - Vegetation/Animal % % Weather/Fire/Earthquake % 100% % 63% - SUSQUEHANNA(12KV) - Customers: 2, rd Party % 97% % 100% 100% 100% % 91% 100% Equipment Failure 100% 100% - 31% 19% % 7% % 1% - Operation % 81% - 10% 3% % 93% % 8% - Other

24 Reliability Histories for Individual Circuits Serving Visalia - 10 of st Qtr nd Qtr rd Qtr 2017 CircuitHistory10 4th 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 SWOOSE(12KV) - Customers: rd Party Equipment Failure Operation % 100% % 14% - Other % % 100% - 74% 86% - TAGUS(12KV) - Customers: rd Party 92% 99% 100% 42% 81% - 16% 28% 15% Equipment Failure 1% 0% % 11% 48% % 20% % 20% - Operation % 18% 36% 0% 0% % 80% % 80% - Other % 66% 61% 38% Vegetation/Animal % Weather/Fire/Earthquake 7% 0% - 5% 1% TAYLOR(12KV) - Customers: 1, rd Party 57% 93% 100% % 2% Equipment Failure % 2% Operation 43% 7% % 61% 97% % 3% - 8% 3% - Other % 97% - 92% 97% - TLSMITH(12KV) - Customers: rd Party 100% 100% 48% % % 50% % 36% 100% 58% 43% 100% Equipment Failure 0% 0% - 2% 0% - 76% 62% % 49% % 1% - 14% 27% - Operation % 0% - 24% 38% - 100% 100% - 2% 0% % 3% - Other % 49% % % 100% - 42% 62% - 26% 27% - Vegetation/Animal % 0% 0% % Weather/Fire/Earthquake % 50%

25 Reliability Histories for Individual Circuits Serving Visalia - 11 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 CircuitHistory11 SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI VOLNEY(12KV) - Customers: 1, rd Party % 50% Equipment Failure % 0% - 74% 79% 62% Operation 1% 1% - 11% 50% % 100% % 0% - Other 99% 99% 100% % 72% - 25% 72% - Vegetation/Animal % 21% 38% % 28% 100% 75% 28% 100% Weather/Fire/Earthquake % 0% WEBB(12KV) - Customers: rd Party 21% 31% % 47% 100% Equipment Failure 49% 64% 80% 23% 2% - 36% 40% Operation % 98% % 100% - 100% 100% - Other % 14% Vegetation/Animal % % Weather/Fire/Earthquake 30% 6% 6% 1% 0% WHITENDALE(12KV) - Customers: 1, rd Party 75% 82% 14% 44% 35% 23% Equipment Failure 23% 12% - 1% 1% - 100% 100% % 100% 100% % 100% 100% Operation 2% 6% - 0% 0% 5% Other % 16% 36% Vegetation/Animal % % Weather/Fire/Earthquake % 48% 12% WOODLAND(12KV) - Customers: 1, rd Party 34% 41% Equipment Failure 55% 55% % 100% - 96% 80% % 4% - 57% 12% - Operation 11% 4% - 100% 100% - 100% 100% % 20% % 11% - 8% 12% - Other % % 85% - 36% 76% - Vegetation/Animal %

26 Reliability Histories for Individual Circuits Serving Visalia - 12 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 CircuitHistory12 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI WUTCHUMNA(12KV) - Customers: 1, rd Party % 39% % 5% - 4% 4% - Equipment Failure 68% 94% 100% 100% 100% - 36% 61% % 33% % 2% - Operation 32% 6% % 67% % 4% - Other % % 100% - 93% 95% - 59% 87% - Weather/Fire/Earthquake % 100% % 4% - YELLOWSTONE(12KV) - Customers: 2, rd Party % % % Equipment Failure % 100% 100% Operation Other