Circuit Reliability Review

Circuit Reliability Review Westminster 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 HUNTINGTON BEACH District CityList1 COSTA MESA FOUNTAIN VALLEY HUNTINGTON BEACH NEWPORT BEACH SEAL BEACH WESTMINSTER 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 Westminster CircuitList1 There are 33 circuits that serve Westminster 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers APACHE(12KV) 549 WATERFIELD(12KV) 2,751 - - BISHOP(12KV) 1,294 WICHITA(12KV) 1,395 - - BLACKHAWK(12KV) 2,732 YOUNGER(12KV) 3,954 - - BUSHARD(12KV) 2,708 - - - CAVALIERS(12KV) 7 - - - CELTICS(12KV) 2,497 - - - CHEROKEE(12KV) 3,854 - - - CHEYENNE(12KV) 886 - - - CHIPPEWA(12KV) 1,736 - - - CHOCTAW(12KV) 43 - - - COMANCHE(12KV) 2,294 - - - DOCTRINE(4.16KV) 372 - - - FLINT(12KV) 1,973 - - - GUAM(12KV) 3,324 - - - HEIL(12KV) 1,603 - - - HIRSCH(12KV) 2,988 - - - HOPI(12KV) 143 - - - JAZZ(12KV) 1,651 - - - JEROME(12KV) 1,752 - - - JOPLIN(12KV) 2,824 - - - LAKERS(12KV) 1,682 - - - MCKEEVER(12KV) 3,501 - - - MIDWAY(4.16KV) 436 - - - PAUL(12KV) 1,638 - - - SIOUX(12KV) 1,688 - - - SONICS(12KV) 3,606 - - - TITTLE(12KV) 3,128 - - - TULSA(12KV) 2,293 - - - VAN BROCKLIN(12KV) 1,307 - - - WARRIORS(12KV) 3,647 - - - Grand Total 66,256 7

Reliability History of Circuits Serving Westminster (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 134.5 139.7 112.1 114.8 122.3 100.5 82.6 67.6 Westminster SAIFI (average frequency of sustained interruptions) 2.0 1.5 1.0 0.5 0.9 1.0 0.9 0.7 1.8 1.1 0.9 1.2 SCE SYSTEMWIDE MAIFI (average frequency of momentary interruptions) 0.0 2.5 2.0 1.5 1.0 0.5 0.0 1.4 1.4 1.4 1.0 2.0 1.6 1.6 1.8 ** 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 Westminster 2017 SAIDIChart Contributions to SAIDI by Outage Cause Equipment Failure e.g., in-service failure of transformer, switch, or conductors Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors Other e.g., patrolled but no cause found Operations e.g., urgent maintenance w/o 3-day notice 3 rd Party e.g., balloon, car hit pole, dig-in Vegetation /Animal 6.0% Other 18.7% Weather /Fire /Earthquake 14.9% Operation 9.8% 3rd Party 20.2% Equipment Failure 30.4% 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 Westminster 2017 SAIFIChart 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 Vegetation /Animal 6.6% Other 28.2% Weather /Fire /Earthquake 7.3% Operation 15.3% 3rd Party 20.6% Equipment Failure 22.0% 3rd Party Equipment Failure Operation Other Vegetation /Animal Weather /Fire /Earthquake SAIFI = the number of times the average customer is interrupted by sustained outages each year 10

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Back-up Slides Reliability Histories of Circuits Serving Westminster Updated through Dec 2017

Average Reliability of 33 Circuits Serving Westminster 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 33 Circuits Serving Westminster -- Total Customers: 66,256 82.6 0.9 1.4 67.6 0.7 1.0 122.3 1.8 2.0 40.4 0.4 0.6 16.0 0.1 0.4 16.9 0.1 0.2 27.2 0.2 0.3 100.5 0.9 1.6 3rd Party 10% 16% 34% 37% 40% 52% 20% 23% 22% 17% 20% 29% 36% 47% 24% 18% 27% 27% 17% 3% 36% 20% 21% 29% Equipment Failure 64% 47% 27% 42% 28% 12% 30% 19% 13% 10% 3% 17% 25% 19% 42% 41% 25% 13% 57% 52% 28% 30% 22% 25% Operation 8% 11% 9% 16% 16% 23% 7% 10% 16% 5% 4% 13% 34% 28% 6% 5% 7% - 5% 31% 17% 10% 15% 10% Other 1% 2% 8% 4% 12% 12% 26% 40% 30% 31% 56% 9% 5% 6% 28% - - 33% 20% 14% 20% 19% 28% 19% Vegetation/Animal 9% 14% 14% 2% 4% 1% 2% 1% 13% - - - - - - 36% 42% 26% 0% 0% - 6% 7% 3% Weather/Fire/Earthquake 7% 10% 8% 0% 0% - 15% 7% 7% 37% 17% 32% - - - - - - - - - 15% 7% 13% 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 Westminster - 1 of 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 APACHE(12KV) - Customers: 549 - - 1.0 - - - 49.9 1.0 2.0 - - CircuitHistory - - - - - - - - - - - - - 3rd Party - - - - - - - - - - - 1- - - - - - - - - - - - - Equipment Failure - - 100% - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - 100% 100% 50% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 50% - - - - - - - - - - - - - - - BISHOP(12KV) - Customers: 1,294 54.1 1.0-38.2 1.0-29.1 0.0-49.8 0.1 - - - - - - 1.0 - - 1.0 49.8 0.1 2.0 3rd Party - - - - - - - - - - - - - - - - - 100% - - - - - 50% Equipment Failure 100% 100% - 40% 4% - 100% 100% - 98% 70% - - - - - - - - - - 98% 70% - Operation - - - - - - - - - 2% 30% - - - - - - - - - 100% 2% 30% 50% Other - - - 60% 96% - - - - - - - - - - - - - - - - - - - BLACKHAWK(12KV) - Customers: 2,732 54.7 1.0-34.9 0.1-74.0 1.1 2.0 - - - - - - 56.1 1.0-2.1 0.0-58.3 1.0-3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 100% 100% - 19% 13% - 11% 3% - - - - - - - - - - 100% 100% - 4% 1% - Operation 0% 0% - 81% 87% - - - - - - - - - - - - - - - - - - - Other - - - - - - 89% 97% 50% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 50% - - - - - - 100% 100% - - - - 96% 99% - BUSHARD(12KV) - Customers: 2,708 122.7 1.0 0.1 154.1 2.9 5.1 112.2 2.0 2.0 0.7 0.0-1.7 0.0 0.9 7.3 0.0 1.4 129.7 2.3 0.4 139.4 2.3 2.7 3rd Party - - - 15% 34% 39% 36% 49% - - - - - - - - - - - - - - - - Equipment Failure 98% 98% 100% 70% 32% 41% 0% 1% 50% - - - 100% 100% - 68% 9% - 95% 59% - 93% 58% - Operation 2% 2% - 0% 0% - 3% 1% - 100% 100% - - - - 32% 91% - 5% 41% 100% 7% 42% 15% Other - - - 15% 34% 20% - - 50% - - - - - 100% - - 100% - - - - - 85% Weather/Fire/Earthquake - - - - - - 61% 49% - - - - - - - - - - - - - - - - 15

Reliability Histories for Individual Circuits Serving Westminster - 2 of 9 CircuitHistory 2 2014 2015 2016 1st Qtr 2017 2nd Qtr 2017 3rd Qtr 2017 4th 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 CAVALIERS(12KV) - Customers: 7 - - - - - - 15.0 1.0-403.7 1.4 1.0 - - - - - - - - - 403.7 1.4 1.0 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - 77% 30% 100% - - - - - - - - - 77% 30% 100% Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - 100% 100% - 23% 70% - - - - - - - - - - 23% 70% - CELTICS(12KV) - Customers: 2,497 103.7 2.3 3.0 - - - 15.4 1.0 1.0 92.7 1.1 1.0 1.5 0.1-81.3 1.0 0.8 2.5 0.0-178.0 2.2 1.8 3rd Party 19% 4% 100% - - - - - 100% 2% 4% - - - - 100% 100% 100% - - - 47% 47% 44% Equipment Failure 71% 51% - - - - - - - - - 100% - - - - - - 73% 50% - 1% 0% 56% Operation 10% 45% 0% - - - 0% 0% - 8% 5% - 100% 100% - - - - 27% 50% - 6% 8% - Other - - - - - - 100% 100% - 89% 91% - - - - - - - - - - 46% 45% - CHEROKEE(12KV) - Customers: 3,854 69.0 1.1-45.6 0.1 0.0 262.6 3.3 3.1 5.1 0.0 2.4 27.5 0.2 2.0 - - - 25.5 0.0-58.1 0.3 4.4 3rd Party 70% 93% - - - - 35% 30% - - - - 72% 71% 49% - - - - - - 34% 61% 22% Equipment Failure 27% 5% - 80% 39% - 18% 32% - - - - 21% 9% 51% - - - 100% 100% - 54% 16% 23% Operation 3% 1% - 20% 61% 100% 23% 5% - 6% 19% 59% 7% 20% - - - - - - - 4% 18% 32% Other - - - - - - 23% 33% 34% - - 41% - - - - - - - - - - - 23% Vegetation/Animal - - - - - - - - 32% - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - - - 34% 94% 81% - - - - - - - - - - 8% 5% - CHEYENNE(12KV) - Customers: 886 28.6 0.2 - - - - 322.1 1.2 2.0 - - - - - - - - - 21.7 0.0 1.0 21.7 0.0 1.0 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 93% 90% - - - - 76% 14% - - - - - - - - - - 100% 100% - 100% 100% - Operation 7% 10% - - - - 2% 2% - - - - - - - - - - - - - - - - Other - - - - - - 22% 84% 50% - - - - - - - - - - - 100% - - 100% Vegetation/Animal - - - - - - - - 50% - - - - - - - - - - - - - - - 16

Reliability Histories for Individual Circuits Serving Westminster - 3 of 9 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 CHIPPEWA(12KV) - Customers: 1,736 86.6 1.2 1.0 104.4 1.2-103.5 2.1 4.0 90.0 0.2 0.9 - - - - - - 7.0 0.1-97.0 0.3 0.9 3rd Party - - - 74% 91% - 5% 2% - - - - - - - - - - 100% 100% - 7% 19% - Equipment Failure 47% 17% 100% 19% 5% - 35% 47% 24% 89% 67% 100% - - - - - - - - - 83% 54% 100% Operation - - - - - - 0% 0% - 11% 33% - - - - - - - - - - 10% 27% - Other - - - 7% 4% - 59% 51% 51% - - - - - - - - - - - - - - - Vegetation/Animal 4% 2% - - - - - - 25% - - - - - - - - - - - - - - - Weather/Fire/Earthquake 50% 80% - - - - - - - - - - - - - - - - - - - - - - CHOCTAW(12KV) - Customers: 43 - - - - - - 234.7 2.7 2.3 18.0 1.0 - - - - - - - - - - 18.0 1.0-3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - - Operation - - - - - - 79% 63% 13% 100% 100% - - - - - - - - - - 100% 100% - Other - - - - - - 21% 37% 43% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 43% - - - - - - - - - - - - - - - COMANCHE(12KV) - Customers: 2,294 65.6 0.3 2.0 89.9 0.2-50.1 1.0 4.0 18.2 0.1 0.0 - - - - - - 69.9 0.8 0.8 88.1 1.0 0.8 3rd Party - - - - - - - - 25% - - - - - - - - - - - - - - - Equipment Failure 50% 36% - 100% 99% - - - - - - - - - - - - - 100% 100% 100% 79% 85% 99% Operation 50% 64% - 0% 1% - - - - 100% 100% 100% - - - - - - - - - 21% 15% 1% Other - - 50% - - - 100% 100% 50% - - - - - - - - - - - - - - - Vegetation/Animal - - 50% - - - - - 25% - - - - - - - - - - - - - - - DOCTRINE(4.16KV) - Customers: 372 8.0 0.0 - - - - 187.0 3.0 1.0 50.8 2.0 1.0 92.8 1.0 - - - - 8.0 1.0-151.6 4.0 1.0 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 74% 50% - - - - 58% 33% - - - - - - - - - - - - - - - - Operation 26% 50% - - - - - - - - - - - - - - - - 100% 100% - 5% 25% - Other - - - - - - 42% 67% 100% 39% 50% - 100% 100% - - - - - - - 74% 50% - Weather/Fire/Earthquake - - - - - - - - - 61% 50% 100% - - - - - - - - - 20% 25% 100% 17

Reliability Histories for Individual Circuits Serving Westminster - 4 of 9 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 FLINT(12KV) - Customers: 1,973 37.9 0.0 2.0 192.8 1.8-64.1 2.1 2.0 - - - 20.5 0.2 - - - - 0.4 0.0-20.9 0.2-3rd Party - - - 24% 37% - 69% 51% 50% - - - - - - - - - - - - - - - Equipment Failure 100% 100% 100% 76% 63% - 6% 0% - - - - 17% 7% - - - - 100% 100% - 19% 7% - Operation - - - 0% 0% - - - - - - - 83% 93% - - - - - - - 81% 93% - Other - - - - - - 25% 48% 50% - - - - - - - - - - - - - - - GUAM(12KV) - Customers: 3,324 111.1 0.1 2.8 6.2 0.0 0.1 126.6 2.1 5.0 53.4 0.6 2.0 0.2 0.0-0.3 0.0-3.0 0.0-56.8 0.6 2.0 3rd Party 0% 1% 36% - - - 6% 1% 40% 89% 91% 100% - - - - - - 53% 92% - 86% 90% 100% Equipment Failure 96% 95% 64% 51% 7% - 51% 51% 19% 11% 7% - - - - - - - 47% 8% - 13% 7% - Operation 4% 4% - 4% 1% 100% 0% 0% - 0% 2% - 100% 100% - 100% 100% - - - - 1% 3% - Other - - - 45% 91% - 42% 48% 40% - - - - - - - - - - - - - - - HEIL(12KV) - Customers: 1,603 - - - 23.2 1.0-221.6 1.1 - - - - - - - 308.9 1.7 2.9 86.8 1.7-395.7 3.4 2.9 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 81% 96% - - - - - - - 50% 58% 35% 86% 39% - 58% 49% 35% Operation - - - - - - - - - - - - - - - - - - 14% 61% - 3% 30% - Other - - - 100% 100% - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - 50% 42% 65% - - - 39% 21% 65% Weather/Fire/Earthquake - - - - - - 19% 4% - - - - - - - - - - - - - - - - HIRSCH(12KV) - Customers: 2,988 6.4 0.1 1.7 41.9 0.7-95.3 1.0 1.5 - - - 18.3 0.0-10.5 0.1-32.2 0.1-61.1 0.1-3rd Party - - 58% - - - - - 68% - - - - - - - - - - - - - - - Equipment Failure 20% 3% - 41% 92% - 93% 44% 2% - - - 100% 100% - 100% 100% - 90% 65% - 95% 86% - Operation 80% 97% 42% 59% 8% - 7% 56% 30% - - - - - - - - - 10% 35% - 5% 14% - Other - - - - - - - - - - - - - - - - - - - - - - - - 18

Reliability Histories for Individual Circuits Serving Westminster - 5 of 9 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 HOPI(12KV) - Customers: 143 170.1 2.0 1.9 2.4 0.0-171.3 2.0 2.0 - - - 88.3 1.0-6.3 0.0 1.0 - - 1.0 94.7 1.1 2.0 3rd Party 2% 0% 48% - - - - - - - - - - - - - - - - - 100% - - 50% Equipment Failure 98% 100% 52% 100% 100% - 71% 51% - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - 100% 100% - - - - - - - 93% 97% - Other - - - - - - 29% 49% 49% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 51% - - - - - - 100% 100% 100% - - - 7% 3% 50% JAZZ(12KV) - Customers: 1,651 137.2 1.8 1.6 108.4 2.4 1.6 127.3 1.9-106.6 1.0-61.8 0.7 1.3 - - - 16.6 0.2 1.8 184.9 1.9 3.1 3rd Party 6% 7% - 54% 42% 19% - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 16% 1% - - - - 100% 100% 100% - - - 85% 95% 100% 41% 47% 100% Operation 0% 1% - 1% 0% - 3% 1% - - - - - - - - - - 15% 5% - 1% 1% - Other 38% 37% 80% - - 61% 38% 49% - 100% 100% - - - - - - - - - - 58% 52% - Vegetation/Animal 56% 55% 20% 46% 57% 19% 44% 49% - - - - - - - - - - - - - - - - JEROME(12KV) - Customers: 1,752 344.4 2.0 2.9 68.0 1.1-19.6 1.2 0.9 - - - 39.2 0.1-14.9 0.2 - - - - 54.1 0.2-3rd Party - - - 85% 93% - - - 100% - - - 100% 100% - - - - - - - 73% 26% - Equipment Failure 100% 100% 65% - - - - - - - - - - - - - - - - - - - - - Operation - - - 15% 7% - - - - - - - - - - 100% 100% - - - - 27% 74% - Other - - 35% - - - 100% 100% - - - - - - - - - - - - - - - - JOPLIN(12KV) - Customers: 2,824 75.5 2.0 0.9 54.6 0.1 1.9 71.4 0.9 1.1 16.9 0.1 1.0 - - - 5.3 0.0-0.2 0.0-22.4 0.1 1.0 3rd Party - - - 5% 26% - - - - 73% 52% 100% - - - - - - - - - 55% 47% 100% Equipment Failure 44% 50% - 44% 46% - - - - - - - - - - 100% 100% - - - - 24% 7% - Operation 4% 0% - 49% 26% 100% 33% 6% - 27% 48% - - - - - - - 100% 100% - 22% 46% - Other 1% 1% - 3% 3% - 56% 91% 100% - - - - - - - - - - - - - - - Vegetation/Animal 51% 49% 100% - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - - - - - 10% 3% - - - - - - - - - - - - - - - - 19

Reliability Histories for Individual Circuits Serving Westminster - 6 of 9 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 LAKERS(12KV) - Customers: 1,682 35.7 0.1 1.0 101.1 1.0 0.2 45.9 1.1-83.9 1.0 1.0 13.5 0.0 2.0 - - - - - - 97.4 1.0 3.0 3rd Party 37% 19% 100% - - - - - - - - 100% - - - - - - - - - - - 34% Equipment Failure 45% 20% - 92% 93% 100% 61% 7% - - - - 88% 71% 100% - - - - - - 12% 3% 66% Operation 19% 61% - 8% 7% - 6% 3% - - - - 12% 29% - - - - - - - 2% 1% - Other - - - - - - 33% 90% - 100% 100% - - - - - - - - - - 86% 96% - MCKEEVER(12KV) - Customers: 3,501 23.3 0.1 1.0 5.9 0.0-63.6 2.1 2.8 2.1 0.0-20.8 0.1 1.0 26.4 0.1-12.9 0.0 1.0 62.2 0.3 2.0 3rd Party - - 99% 65% 76% - - - - - - - - - - - - - - - - - - - Equipment Failure 95% 86% 1% 35% 24% - 91% 51% 64% - - - - - - 82% 47% - 100% 100% - 55% 27% - Operation 5% 14% - - - - 9% 49% 36% - - - 78% 54% - 18% 53% - - - - 34% 43% - Other - - - - - - - - - 100% 100% - 22% 46% 100% - - - - - 100% 11% 29% 100% MIDWAY(4.16KV) - Customers: 436 - - 1.0 550.7 1.0-31.3 1.0 1.0 20.0 1.0 - - - - - - - - - - 20.0 1.0-3rd Party - - 100% 100% 100% - - - - - - - - - - - - - - - - - - - Equipment Failure - - - - - - 53% 6% - - - - - - - - - - - - - - - - Operation - - - - - - - - - - - - - - - - - - - - - - - - Other - - - - - - 47% 94% 100% 100% 100% - - - - - - - - - - 100% 100% - PAUL(12KV) - Customers: 1,638 225.9 2.0 2.2 244.5 1.0 1.3 11.9 0.7 0.3 - - - 10.4 0.1 - - - - - - - 10.4 0.1-3rd Party - - 46% 71% 91% 100% - - - - - - - - - - - - - - - - - - Equipment Failure 61% 16% - 29% 9% - 45% 1% - - - - 100% 100% - - - - - - - 100% 100% - Operation 3% 51% 16% - - - 55% 99% 100% - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal 35% 33% 38% - - - - - - - - - - - - - - - - - - - - - 20

Reliability Histories for Individual Circuits Serving Westminster - 7 of 9 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 SIOUX(12KV) - Customers: 1,688 43.6 1.0-51.8 1.0-60.6 1.2 2.1 28.6 0.5 0.9 - - 1.0 - - - - - - 28.6 0.5 1.9 3rd Party - - - - - - - - - 100% 100% 100% - - - - - - - - - 100% 100% 49% Equipment Failure 96% 99% - 8% 1% - 5% 0% - - - - - - - - - - - - - - - - Operation 4% 1% - 92% 99% - - - - - - - - - 100% - - - - - - - - 51% Other - - - - - - 95% 100% 55% - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - 45% - - - - - - - - - - - - - - - SONICS(12KV) - Customers: 3,606 28.8 0.1-82.1 1.1 1.0 271.5 3.0 2.8 44.5 1.0-104.3 1.1-4.2 0.0-2.3 0.0-155.3 2.2-3rd Party - - - - - 100% 36% 33% 32% - - - 60% 90% - - - - - - - 40% 46% - Equipment Failure 29% 54% - 82% 98% - 30% 7% - 13% 3% - - - - 100% 100% - 100% 100% - 8% 2% - Operation 71% 46% - 18% 2% - - - - - - - 40% 10% - - - - - - - 27% 5% - Other - - - - - - 27% 58% 35% 87% 97% - - - - - - - - - - 25% 46% - Vegetation/Animal - - - - - - 8% 2% 33% - - - - - - - - - - - - - - - TITTLE(12KV) - Customers: 3,128 82.6 1.2 5.4 88.5 1.1 4.0 331.5 1.5 1.4 17.7 0.1 - - - 0.9 - - - 10.8 0.0 0.4 28.6 0.1 1.3 3rd Party 47% 36% 19% 56% 91% 50% 13% 32% - - - - - - 100% - - - - - - - - 70% Equipment Failure 16% 7% 19% 32% 5% - 8% 5% - 13% 21% - - - - - - - - - - 8% 15% - Operation - - 18% 9% 3% 25% 1% 32% 49% 87% 79% - - - - - - - 100% 100% 100% 92% 85% 30% Other - - - 2% 0% 25% - - - - - - - - - - - - - - - - - - Vegetation/Animal 37% 57% 26% - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake - - 18% - - - 78% 31% 51% - - - - - - - - - - - - - - - TULSA(12KV) - Customers: 2,293 5.9 0.0 0.5 78.6 1.0 0.9 158.6 3.0 1.0 88.1 1.0 1.0 10.0 0.0 1.0 - - - 9.3 0.1-107.4 1.1 2.0 3rd Party - - - 97% 96% 100% - - - 100% 100% - - - - - - - - - - 82% 91% - Equipment Failure 100% 100% - 1% 0% - 30% 32% - - - - 98% 92% 100% - - - - - - 9% 3% 49% Operation - - - - - - 29% 33% 100% - - - - - - - - - - - - - - - Other - - 100% - - - 41% 34% - - - - 2% 8% - - - - 100% 100% - 9% 6% - Weather/Fire/Earthquake - - - 2% 3% - - - - - - 100% - - - - - - - - - - - 51% 21

Reliability Histories for Individual Circuits Serving Westminster - 8 of 9 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 VAN BROCKLIN(12KV) - Customers: 1,307 226.4 2.7 0.7 100.3 0.7 2.0 26.0 0.1 2.0 - - - - - - 33.8 0.2-20.3 0.6 1.0 54.1 0.8 1.0 3rd Party - - - - - - - - - - - - - - - - - - - - - - - - Equipment Failure 62% 59% - 100% 100% 100% 77% 70% - - - - - - - 94% 83% - 100% 100% 100% 96% 96% 100% Operation 38% 41% 100% - - - 23% 30% 50% - - - - - - 6% 17% - - - - 4% 4% - Other - - - - - - - - 50% - - - - - - - - - - - - - - - WARRIORS(12KV) - Customers: 3,647 103.5 1.8 2.7 30.1 1.3 3.0 186.2 4.2 2.9 301.9 2.1 3.9 - - - - - - 94.5 0.6-396.4 2.7 3.9 3rd Party 41% 55% 36% 31% 1% 33% 28% 24% 34% - - - - - - - - - - - - - - - Equipment Failure 42% 13% 28% 9% 0% - 9% 2% - - - 23% - - - - - - - - - - - 23% Operation 1% 1% - 59% 99% 67% 8% 3% 33% - - - - - - - - - - - - - - - Other - - - - - - 46% 47% - 13% 48% - - - - - - - 100% 100% - 33% 60% - Vegetation/Animal - - - - - - 1% 0% - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 16% 32% 36% - - - 8% 24% 33% 87% 52% 77% - - - - - - - - - 67% 40% 77% WATERFIELD(12KV) - Customers: 2,751 246.2 2.2 1.0 2.6 0.0-129.6 2.5 3.3 1.2 0.0-39.1 0.4 - - - - 16.2 0.1-56.5 0.5-3rd Party - - - - - - 48% 57% 34% - - - - - - - - - - - - - - - Equipment Failure 57% 55% 100% 100% 100% - 51% 42% 37% - - - 13% 9% - - - - 98% 73% - 37% 17% - Operation - - - - - - 1% 1% 29% 100% 100% - 87% 91% - - - - 2% 27% - 63% 83% - Other - - - - - - - - - - - - - - - - - - - - - - - - Weather/Fire/Earthquake 43% 45% - - - - - - - - - - - - - - - - - - - - - - WICHITA(12KV) - Customers: 1,395 - - 2.0 150.5 1.3 2.0 16.0 1.0 2.0 - - - - - 1.0 - - - - - - - - 1.0 3rd Party - - - 99% 98% 100% - - 50% - - - - - - - - - - - - - - - Equipment Failure - - 50% - - - - - - - - - - - - - - - - - - - - - Operation - - 50% 1% 2% - - - - - - - - - - - - - - - - - - - Other - - - - - - 100% 100% 50% - - - - - 100% - - - - - - - - 100% 22

Reliability Histories for Individual Circuits Serving Westminster - 9 of 9 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 YOUNGER(12KV) - Customers: 3,954 36.8 0.1 1.0 44.1 0.0 2.0 53.8 1.5 1.0 4.9 0.0-2.7 0.0-4.3 0.0-81.8 0.1 1.9 93.7 0.1 1.9 3rd Party - - 100% - - 100% 82% 98% - - - - 100% 100% - - - - 92% 88% 100% 84% 62% 100% Equipment Failure 59% 42% - 3% 14% - 18% 2% - 100% 100% - - - - 100% 100% - 7% 6% - 16% 34% - Operation 24% 49% - 97% 86% - - - 100% - - - - - - - - - - - - - - - Other - - - - - - - - - - - - - - - - - - - - - - - - Vegetation/Animal - - - - - - - - - - - - - - - - - - 0% 6% - 0% 4% - Weather/Fire/Earthquake 18% 9% - - - - - - - - - - - - - - - - - - - - - - 23