Santa Clarita

Circuit Reliability Review

Santa Clarita

2021 Who We Are

• Southern California Edison (SCE) is an Edison International company • One of the nation’s largest electric utilities • More than 130 years of history • Headquartered in Rosemead, California • Regulated by the California Public Utilities Commission (CPUC) and the Federal Energy Regulatory Commission (FERC) • 50,000 square miles of SCE service area across Central, Coastal, and Southern California • 15 million residents through 5 million customer accounts • 445 communities and 13 Native American tribes

2 Our Grid

To deliver safe, reliable, and affordable power, we monitor and maintain a vast electricity system

50,000 Square Miles

4,600 Circuits

1.4 Million Poles

119,000 Miles of Transmission and Distribution Lines

730,000 Transformers

3 Strengthening and Modernizing the Grid

SCE plans to spend more than $5B each 2020 Capital Investments year to maintain, improve, and harden its infrastructure 235 miles of underground cable replaced • Infrastructure reliability – updating underground cables, poles, switches, and 97 miles of overhead conductor transformers replaced for public safety • Wildfire mitigation – hardening infrastructure, bolstering situational awareness capabilities, and enhancing operational practices 11.1k distribution poles replaced

• Transmission – connecting renewables, installing new substations, and updating lines 3.6k transmission poles replaced • Grid readiness – updating the grid for impacts from new technologies 79 underground structure • Long-term energy policy – supporting energy replacements storage, electric vehicles, and renewables

SCE’s investments support safe, reliable, affordable, and clean energy for our customers

4 Protecting Public Safety: Wildfire Mitigation Activities

2020 Year-End Progress Report – Data as of 12/31/20 5 Protecting Public Safety: Public Safety Power Shutoffs

• To reduce the threat of wildfires, SCE implements Public Safety Power Shutoffs (PSPS) to temporarily shut off power to some customers in areas with a high risk for wildfires to prevent the electric system from becoming the source of ignition • PSPS is used as a measure of last resort to protect public safety under dangerous fire weather conditions, including high winds, low humidity, and dry vegetation • Multiple methods are used to notify people in affected areas before, during and after a PSPS event • SCE provides resources to support customers during PSPS and offers several programs and rebates to help customers be prepared and more resilient during emergencies • SCE is working to reduce the impact of PSPS and is continuing to strengthen the electric grid to become more resilient in the face of extreme weather events 6 Creating a Clean Energy Future

Pathway 2045: Key steps California must take to reach carbon neutrality

100% of grid sales with 26 million electric carbon-free electricity vehicles 80 GW of utility-scale Over 1 million clean generation electrified medium 30 GW of utility-scale and heavy duty energy storage vehicles

70% of all buildings will 50% reduction in natural use efficient electric gas consumption space and water heating 40% of the remaining 90% fewer GHG natural gas is emissions from all- biomethane and electric homes hydrogen

7 Reliability Overview

8 What is Reliability?

• In simplest terms: Having dependable electricity when you need it. • Outages: • Maintenance outages (aka planned outages) • Repair outages (aka unplanned outages) • Sustained Outage = An outage lasting > 5 minutes • Momentary Outage = An outage lasting ≤ 5 minutes • Public Safety Power Shutoff (PSPS)

Major Event Day (MED) : A day in which the daily system SAIDI exceeds a threshold value. For the purposes of calculating daily system SAIDI, any interruption that spans multiple calendar days is accrued to the day on which the interruption began. Statistically, days having a daily system SAIDI greater than a threshold value are days on which the energy delivery system experienced stresses beyond that normally expected (such as severe weather). Public Safety Power Shutoff (PSPS) : An operational protocol that SCE implements under extreme weather conditions in order to minimize the threat of wildfires and keep communities safe from potentially dangerous situations. These types of sustained outages are temporary and usually involve situations where high fire areas are experiencing adverse weather or public safety is at risk.

9 How Do We Measure Reliability?

10 Note: The number of customers listed Overview of Santa Clarita represents the total number of11 customers on each circuit (not the local jurisdiction). There are 54 circuits that serve Santa Clarita 1 Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers ANACONDA(16KV) 1,704 MCBEAN(16KV) 3,039 - - ARLENE(16KV) 1,634 MENTRY(16KV) 2,097 - - BERMITE(16KV) 966 MINT CANYON(16KV) 1,202 - - BLACKBIRD(16KV) 1,445 MOCCASIN(16KV) 1,449 - - BOA(16KV) 1,661 MORRIE(16KV) 258 - - BOUQUET(16KV) 761 NEARGATE(16KV) 1,681 - - CAESAR(16KV) 2,409 NERO(16KV) 2,104 - - CALGROVE(16KV) 1,811 NIGHTHAWK(16KV) 337 - - CENTURION(16KV) 2,128 ORION(16KV) 3,056 - - CHARIOT(16KV) 2,741 PLACERITA(16KV) 1,341 - - COBRA(16KV) 1,701 POWELL(16KV) 2,266 - - CONSTANTINE(16KV) 2,332 PYTHON(16KV) 1,483 - - COPPERHEAD(16KV) 775 RACER(16KV) 699 - - COTTONMOUTH(16KV) 3,442 RATTLER(16KV) 3,212 - - CRABTREE(16KV) 1,527 RINER(16KV) 1,120 - - CROSS(16KV) 1,298 ROMANUS(16KV) 2,337 - - DEWITT(16KV) 1,260 SAND CANYON(16KV) 2,156 - - DIAMONDBACK(16KV) 2,517 STARFIGHTER(16KV) 3,324 - - DRY CANYON(16KV) 1,669 TIPS(16KV) 542 - - ELECTRA(16KV) 285 TOGA(16KV) 1,995 - - GAVIN(16KV) 892 VAL VERDE(16KV) 159 - - GUITAR(16KV) 346 VASQUEZ(16KV) 2,199 - - HILLFIELD(16KV) 2,386 WILDWOOD(16KV) 2,305 - - JBSHERMAN(16KV) 2,690 WILEY(16KV) 2,393 - - JULIUS(16KV) 3,184 - - - LYONS(16KV) 3,913 - - - MAGIC(16KV) 208 - - - MAMBA(16KV) 2,111 - - - MARCUS(16KV) 1,557 - - - MAXIMUS(16KV) 2,701 - - -

Grand Total 96,808

11 BarChart Reliability History of Circuits Serving Santa Clarita (No Exclusions)

2017 2018 2019 2020 400.0 380.5 350.0 343.5 300.0 SAIDI 250.0 (average 201.3 200.0 178.0 minutes of 139.7 150.0 144.9 136.8 sustained 98.2 100.0 interruptions) 50.0 Santa Clarita 0.0

1.6 1.4 1.4 SCE SYSTEMWIDE 1.2 1.2 1.2 1.2 1.1 SAIFI 1.0 1.0 1.0 0.9 (average 0.8 frequency of 0.6 sustained 0.4 interruptions) 0.2 **“Exclusions” are days which 0.0 utilities are allowed to remove 2.0 from their metrics because 1.8 the outages on those days 1.4 were caused by acts of 1.5 1.4 1.4 1.4 MAIFI 1.2 nature. (average 0.9 0.9 frequency of 1.0 momentary **Data is as of 03/16/2021, data interruptions) 0.5 can be slightly different due to outage data validation process 0.0

12 SAIDIChart Causes of Repair Outages in Santa Clarita 2020

Contributions to ▪ Equipment Failure e.g., in-service failure of SAIDI by Outage Cause transformer, switch, or conductors ▪Vegetation/Animal e.g., tree branch, rodent, or bird causing a short circuit between conductors ▪ Other e.g., patrolled Equipment but no cause found Failure ▪ Operations e.g., urgent 18.0% maintenance w/o 3-day notice Other rd ▪ 3 Party e.g., balloon, PSPS 2.8% car hit pole, dig-in 72.6% Operation ▪ PSPS e.g., Public 2.5% Safety Power Shutoff 3rd Party 2.3%

Vegetation /Animal 1.8% Weather /Fire /Earthquake 0.1%

SAIDI = the cumulative amount of time the average customer is interrupted by “sustained” outages each year.

13 SAIFIChart Causes of Repair Outages in Santa Clarita 2020

ContributionsContributions to toSAIFI SAIFI by byOutage Outage Cause Cause

Vegetation /Animal 18.0% Other ▪ Equipment Failure Vegetation /Animal 9.1% e.g., in-service failure of 18.0% transformer, switch, or conductors PSPS PSPS ▪ 19.6% Vegetation/Animal 19.6% e.g., tree branch, rodent, or bird Other causing a short circuit between 9.1% conductors 3rd Party ▪ Other 3rd Party 6.2% e.g., patrolled but no cause found 6.2% ▪ Operations e.g., urgent maintenance w/o 3-day Operation notice 4.9% ▪ 3rd Party e.g., balloon, car hit pole, dig-in Equipment Failure Weather Weather/Fire /Fire ▪ PSPS 42.1% /EarthquakeOperation/Earthquake e.g., Public Safety Power Shutoff Equipment Failure 4.9%0.1% 0.1% 42.1%

SAIFI = the number of times the average customer is interrupted by “sustained” outages each year

14 15 16 Back-up Slides

Reliability Histories of Circuits Serving Santa Clarita

Updated through Dec 2020

17 Average Reliability of 54 Circuits Serving Santa Clarita CitySummary

2017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020 4th Qtr 2020 2020 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI 54 Circuits Serving Santa Clarita -- Total Customers: 96,808 144.9 1.2 1.2 98.2 1.2 1.4 343.5 1.0 0.9 12.3 0.3 0.3 34.0 0.4 0.2 33.7 0.3 0.3 300.4 0.4 0.1 380.5 1.4 0.9 3rd Party 8% 11% 17% 25% 38% 19% 4% 3% 7% 2% 1% 0% - - 1% 26% 26% 6% 0% 0% 1% 2% 6% 2% Equipment Failure 51% 41% 27% 59% 45% 12% 19% 63% 35% 36% 11% 16% 88% 87% 27% 46% 42% 21% 6% 26% 0% 18% 42% 18% Operation 11% 16% 1% 15% 12% 9% 2% 7% 9% 39% 3% 2% 8% 9% 12% 6% 6% 1% 0% 1% 0% 3% 5% 4% Other 18% 16% 28% 1% 3% 18% 1% 2% 38% 1% 5% 82% 2% 1% 19% 20% 24% 2% 1% 7% 77% 3% 9% 44% Vegetation/Animal 1% 5% 9% 1% 1% 41% 0% 0% 11% 22% 80% - 3% 4% 41% 2% 2% 71% 1% 4% - 2% 18% 29% Weather/Fire/Earthquake 12% 10% 18% 0% 1% 1% 0% 1% - 0% 0% - 0% 0% 0% 0% 0% - 0% 0% 10% 0% 0% 1% PSPS ------74% 24% ------0% 0% - 92% 61% 11% 73% 20% 2%

SCE SYSTEMWIDE 139.7 1.2 1.8 136.8 0.9 1.4 178.0 1.0 1.4 17.1 0.2 0.3 17.2 0.2 0.4 71.4 0.3 0.4 95.5 0.4 0.4 201.3 1.1 1.4 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 3rd Party: e.g., balloons, car hit pole, dig-in Vegetation/Animal: e.g., tree branch, rodent, or bird causing short circuit across conductors PSPS: e.g., Public Safety Power Shutoff

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.

18 Reliability Histories for Individual Circuits Serving Santa Clarita - 1 of 14

ANACONDA(16KV) - Customers: 1,704 108.8 0.4 0.1 346.3 3.0 2.8 838.1 1.0 - 13.4 1.0 1.0 ------477.3 1.2 0.8 490.7 2.2 1.8 3rd Party - - - 100% 100% 28% - - - - - CircuitHistory1------Equipment Failure 39% 22% ------41% 81% - 40% 45% - Operation 37% 55% 100% ------0% 1% - 0% 1% - Other 23% 23% ------100% ------56% Vegetation/Animal - - - - - 72% - - - 100% 100% ------3% 45% - Weather/Fire/Earthquake ------PSPS ------100% 100% ------59% 18% 100% 57% 10% 44% ARLENE(16KV) - Customers: 1,634 37.7 0.2 1.0 351.8 3.1 2.1 2055.4 2.3 ------2639.8 2.4 1.0 2639.8 2.4 1.0 3rd Party ------1% 2% ------Equipment Failure 69% 76% - 94% 52% 100% 3% 9% ------0% 0% - 0% 0% - Operation - - - 2% 16% ------0% 3% - 0% 3% - Other 25% 21% - 4% 33% - 0% 0% ------100% - - 100% Vegetation/Animal ------Weather/Fire/Earthquake 6% 3% 100% ------PSPS ------96% 89% ------100% 97% - 100% 97% - BERMITE(16KV) - Customers: 966 98.9 1.0 1.0 17.1 0.1 - 37.7 0.1 1.0 2.6 0.1 - 113.8 0.4 0.4 163.6 1.1 0.3 - - - 280.0 1.5 0.7 3rd Party 5% 1% - - - - 60% 30% ------Equipment Failure 94% 98% - 100% 100% - - - - 100% 100% - 90% 89% 100% 100% 100% 100% - - - 96% 97% 100% Operation ------40% 70% 100% - - - 10% 11% ------4% 3% - Other ------Vegetation/Animal 2% 2% 100% ------Weather/Fire/Earthquake ------PSPS ------BLACKBIRD(16KV) - Customers: 1,445 361.0 3.6 2.5 251.3 3.1 1.2 248.9 1.0 - - - - 46.9 1.0 - 22.0 0.3 - - - - 68.8 1.3 - 3rd Party ------Equipment Failure 52% 22% 50% 6% 57% - 98% 96% - - - - 100% 100% - 33% 50% - - - - 79% 89% - Operation 16% 29% - 93% 18% - 2% 4% ------67% 50% - - - - 21% 11% - Other 31% 50% 9% - - 82% ------Vegetation/Animal - - 41% ------Weather/Fire/Earthquake - - - 2% 25% 18% ------PSPS ------

19 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 2 of 14 2

BOA(16KV) - Customers: 1,661 0.6 0.0 1.0 99.9 2.0 4.0 14.1 0.1 1.0 12.5 1.0 1.0 - - 1.0 114.9 1.0 0.2 0.1 0.0 - 127.5 2.0 2.3 3rd Party 100% 100% 0% 34% 49% 25% 4% 17% ------Equipment Failure - - - 14% 2% 25% 89% 77% ------100% 100% 19% 100% 100% - 90% 49% 2% Operation - - - 52% 49% - 7% 6% ------100% - - 81% - - - - - 53% Other ------100% - - 100% ------46% Vegetation/Animal - - 100% - - 50% - - - 100% 100% ------10% 51% - Weather/Fire/Earthquake ------PSPS ------BOUQUET(16KV) - Customers: 761 72.3 1.1 1.0 7.3 0.0 - 4335.3 2.2 1.0 - - 1.0 0.1 0.0 - 299.7 1.0 - 8.7 0.0 1.0 308.5 1.1 2.0 3rd Party - - 100% 87% 75% ------Equipment Failure 0% 0% ------0% 0% - 100% 100% - 3% 5% - Operation 14% 11% - 7% 17% - 0% 2% - - - - 100% 100% - 1% 2% - - - - 1% 2% - Other ------0% 1% 100% - - 100% - - - 99% 98% - - - 100% 96% 93% 100% Vegetation/Animal - - - 5% 8% ------Weather/Fire/Earthquake 85% 89% ------PSPS ------100% 97% ------CAESAR(16KV) - Customers: 2,409 60.5 1.0 - 5.5 0.1 1.0 499.0 1.1 - 10.4 0.0 - 12.1 0.1 - 6.9 0.0 - 88.7 1.1 - 118.1 1.2 - 3rd Party 100% 100% - - - - 94% 89% ------Equipment Failure - - - 100% 100% 1% 5% 9% - 99% 92% - 100% 100% - 100% 100% - 100% 100% - 100% 100% - Operation ------1% 3% - 1% 8% ------0% 0% - Other - - - - - 99% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------CALGROVE(16KV) - Customers: 1,811 20.0 0.1 1.0 2.6 0.0 - 1131.9 3.2 2.0 8.0 0.0 0.0 9.8 0.0 1.1 53.0 1.1 - 2.5 0.0 - 73.3 1.2 1.1 3rd Party - - 98% ------9% 5% 100% ------1% 0% 1% Equipment Failure 100% 100% 1% 97% 93% - 15% 39% 1% 91% 95% - - - - 93% 92% - - - - 77% 90% - Operation - - - 3% 7% - 3% 29% 50% - - - 100% 100% 4% 7% 8% - 89% 93% - 22% 10% 4% Other - - 1% - - - - - 49% - - - - - 96% 0% 0% - 11% 7% - 0% 0% 95% Vegetation/Animal ------0% 0% ------Weather/Fire/Earthquake ------PSPS ------83% 32% ------

20 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 3 of 14 3

CENTURION(16KV) - Customers: 2,128 45.8 0.5 1.0 - - 1.0 301.2 2.1 1.9 - - - 5.9 0.0 0.0 - - - - - 0.0 5.9 0.0 0.1 3rd Party ------Equipment Failure 100% 100% 100% - - - 100% 100% 100% - - - 48% 51% 51% ------48% 51% 34% Operation ------0% 0% - - - - 52% 49% 49% - - - - - 100% 52% 49% 66% Other - - - - - 100% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------CHARIOT(16KV) - Customers: 2,741 154.7 1.2 1.0 130.9 1.1 1.0 - - 0.9 6.8 0.1 - - - - 1.9 0.0 0.9 0.1 0.0 - 8.8 0.1 0.9 3rd Party ------100% 100% ------77% 87% - Equipment Failure 90% 87% 100% 100% 100% - - - 100% ------100% 100% - - - - 21% 5% - Operation 10% 13% ------100% 100% - 2% 9% - Other - - - - - 100% ------Vegetation/Animal ------100% - - - - - 100% Weather/Fire/Earthquake ------PSPS ------COBRA(16KV) - Customers: 1,701 5.1 0.3 1.0 95.0 1.6 4.0 57.3 0.3 - 13.0 1.0 1.0 10.8 0.1 - 7.9 0.1 - 1502.6 3.0 - 1534.3 4.2 1.0 3rd Party - - - 58% 81% 25% 11% 12% ------Equipment Failure 34% 2% - 42% 19% - 3% 5% ------56% 49% - - - - 0% 1% - Operation 66% 98% - - - - 86% 83% - - - - 100% 100% ------1% 1% - Other ------100% - - - 44% 51% - - - - 0% 1% 100% Vegetation/Animal - - - - - 75% - - - 100% 100% ------1% 24% - Weather/Fire/Earthquake - - 100% ------PSPS ------100% 100% - 98% 73% - CONSTANTINE(16KV) - Customers: 2,332 43.2 0.4 0.8 188.5 1.5 - 37.5 0.2 1.4 0.0 0.0 - - - - 0.7 0.0 - - - - 0.8 0.0 - 3rd Party ------Equipment Failure 90% 94% 87% 61% 75% - 100% 100% 100% ------Operation 10% 6% 13% 39% 25% - - - - 100% 100% - - - - 100% 100% - - - - 100% 100% - Other ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------

21 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 4 of 14 4

COPPERHEAD(16KV) - Customers: 775 57.2 1.0 - 52.1 1.4 3.6 106.1 1.2 - 16.1 1.0 1.0 - - - 241.8 2.4 1.4 - - - 257.9 3.4 2.4 3rd Party 100% 100% - 85% 99% 16% ------Equipment Failure - - - 15% 1% - 100% 100% ------78% 44% 100% - - - 73% 31% 57% Operation ------12% 12% - - - - 11% 8% - Other ------100% - - - 10% 44% - - - - 10% 31% 43% Vegetation/Animal - - - - - 84% - - - 100% 100% ------6% 31% - Weather/Fire/Earthquake ------PSPS ------COTTONMOUTH(16KV) - Customers: 3,442 191.8 2.4 - 130.6 2.4 2.4 310.5 1.0 - 11.9 1.0 1.0 240.8 2.0 0.0 6.4 0.0 - - - - 259.1 3.1 1.0 3rd Party - - - 40% 57% 5% ------Equipment Failure 80% 87% - 60% 43% 12% ------100% 100% 100% 79% 53% - - - - 95% 67% 2% Operation 20% 13% ------21% 47% - - - - 1% 1% - Other ------100% ------98% Vegetation/Animal - - - - - 83% - - - 100% 100% ------5% 32% - Weather/Fire/Earthquake ------PSPS ------100% 100% ------CRABTREE(16KV) - Customers: 1,527 621.9 4.0 1.1 144.5 1.9 0.2 0.1 0.0 ------1.2 166.3 1.0 - - - - 166.3 1.0 1.2 3rd Party ------Equipment Failure 44% 22% 100% 100% 100% 100% 100% 100% ------100% 100% - - - - 100% 100% - Operation 17% 25% ------Other ------100% ------100% Vegetation/Animal 4% 28% ------Weather/Fire/Earthquake 36% 25% ------PSPS ------CROSS(16KV) - Customers: 1,298 16.8 0.2 0.0 7.1 0.0 - - - 1.0 3.7 0.0 - - - - 0.7 0.0 - 10.2 0.0 - 14.6 0.1 - 3rd Party ------Equipment Failure 79% 28% - 100% 100% ------100% 100% - 100% 100% - 75% 64% - Operation 21% 72% 100% ------100% 100% ------25% 36% - Other ------100% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------

22 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 5 of 14 5

DEWITT(16KV) - Customers: 1,260 61.6 0.3 0.1 31.1 0.3 - 37.6 1.2 1.0 9.0 0.0 - - - - 4.7 0.1 - - - - 13.7 0.1 - 3rd Party ------Equipment Failure 93% 76% 100% 89% 76% - 95% 94% - 100% 100% ------65% 30% - Operation 7% 24% - 11% 24% - 5% 6% ------100% 100% - - - - 35% 70% - Other ------100% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------DIAMONDBACK(16KV) - Customers: 2,517 32.8 0.2 - 71.3 1.5 2.6 57.8 0.4 - 19.9 1.0 1.0 6.6 0.1 ------26.5 1.1 1.0 3rd Party - - - 65% 95% 22% ------Equipment Failure 65% 63% - 35% 5% - 94% 82% - 34% 3% ------25% 3% - Operation 35% 37% - - - - 6% 18% - - - - 100% 100% ------25% 10% - Other ------100% ------100% Vegetation/Animal - - - - - 78% - - - 66% 97% ------50% 88% - Weather/Fire/Earthquake ------PSPS ------DRY CANYON(16KV) - Customers: 1,669 50.7 1.0 - 1.4 0.0 - 436.5 2.0 ------65.6 1.0 - - - - 65.6 1.0 - 3rd Party ------Equipment Failure 100% 100% - - - - 100% 100% ------Operation - - - 100% 100% ------Other ------100% 100% - - - - 100% 100% - Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------ELECTRA(16KV) - Customers: 285 271.9 1.2 2.8 - - 1.0 53.2 1.0 1.0 - - - 125.3 1.0 ------125.3 1.0 - 3rd Party ------Equipment Failure ------100% 100% 100% - - - 100% 100% ------100% 100% - Operation - - 35% ------Other - - 35% - - 100% ------Vegetation/Animal 1% 14% 30% ------Weather/Fire/Earthquake 99% 86% ------PSPS ------

23 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 6 of 14 6

GAVIN(16KV) - Customers: 892 2.2 0.2 - 25.1 0.1 - 238.9 0.9 1.2 ------0.9 0.0 - - - - 0.9 0.0 - 3rd Party ------Equipment Failure - - - 12% 17% - 98% 97% 3% ------100% 100% - - - - 100% 100% - Operation 100% 100% - - - - 2% 3% ------Other - - - 88% 83% - - - 97% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------GUITAR(16KV) - Customers: 346 548.8 2.7 2.4 7.6 0.2 1.0 3829.6 4.3 2.4 8.3 0.0 0.1 6.5 0.0 0.2 - - - 491.8 0.5 - 506.5 0.5 0.4 3rd Party 1% 4% - 87% 91% 100% ------Equipment Failure 12% 39% 8% - - - 3% 7% 41% 4% 25% - 12% 21% ------0% 2% - Operation ------0% 1% 14% - - - 25% 36% 52% ------0% 3% 34% Other - - 43% - - - 2% 23% 45% - - 100% 6% 7% - - - - 19% 26% - 19% 24% 35% Vegetation/Animal - - 50% ------Weather/Fire/Earthquake 87% 57% - 13% 9% - - - - 96% 75% - 58% 36% 48% ------2% 4% 31% PSPS ------95% 69% ------81% 74% - 78% 67% - HILLFIELD(16KV) - Customers: 2,386 420.4 1.9 3.0 193.9 3.2 2.0 625.5 1.9 0.4 - - - 0.2 0.0 - - - - 3534.4 2.9 1.0 3534.6 2.9 1.0 3rd Party ------Equipment Failure - - - 91% 62% - 3% 5% ------Operation 1% 2% - 9% 38% 100% 5% 38% 100% - - - 100% 100% ------0% 0% - Other 1% 0% 34% ------100% - - 100% Vegetation/Animal - - - 0% 0% - 0% 0% ------Weather/Fire/Earthquake 97% 98% 66% ------PSPS ------92% 56% ------100% 100% - 100% 100% - JBSHERMAN(16KV) - Customers: 2,690 170.2 1.0 1.3 92.2 1.0 0.9 8.1 0.1 ------69.5 0.7 1.2 - - - 69.5 0.7 1.2 3rd Party - - 77% ------Equipment Failure 97% 97% 23% 100% 100% 100% 54% 56% ------97% 97% 100% - - - 97% 97% 100% Operation 3% 3% - - - - 46% 44% ------3% 3% - - - - 3% 3% - Other ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------

24 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 7 of 14 7

JULIUS(16KV) - Customers: 3,184 355.3 2.4 - 159.8 1.5 2.3 41.8 1.7 1.8 - - - 34.3 0.1 - - - 1.0 1114.2 2.0 - 1148.5 2.1 1.0 3rd Party - - - 91% 94% 56% 3% 1% ------Equipment Failure - - - 0% 0% - 93% 98% 43% ------Operation 4% 16% - 9% 6% - 4% 1% - - - - 100% 100% - - - - 0% 0% - 3% 6% - Other 96% 84% - - - 44% - - 57% ------7% 50% - 7% 47% - Vegetation/Animal ------100% - - - - - 100% Weather/Fire/Earthquake ------PSPS ------93% 50% - 90% 47% - LYONS(16KV) - Customers: 3,913 572.2 4.1 4.3 64.9 2.1 1.0 33.8 1.1 5.0 - - - 2.7 0.0 - 201.7 1.9 0.9 - - - 204.4 2.0 0.9 3rd Party 6% 23% 73% 30% 49% 100% ------93% 98% - - - - 91% 96% - Equipment Failure 93% 56% - 65% 50% - 65% 88% 40% ------1% 0% - - - - 1% 0% - Operation - - - 5% 1% - 35% 11% ------6% 2% - - - - 6% 2% - Other ------0% 0% 20% - - - 100% 100% ------1% 2% - Vegetation/Animal ------40% ------100% - - - - - 100% Weather/Fire/Earthquake 1% 20% 27% ------0% 0% - - - - 0% 0% - PSPS ------MAGIC(16KV) - Customers: 208 423.0 2.5 0.7 19.4 1.0 - 464.5 3.2 ------90.0 1.0 - 0.9 0.0 - 90.9 1.0 - 3rd Party ------Equipment Failure 100% 100% 100% 96% 99% - 100% 100% ------30% 12% - - - - 30% 12% - Operation - - - 4% 1% ------100% 100% - 1% 2% - Other ------70% 88% - - - - 69% 87% - Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------MAMBA(16KV) - Customers: 2,111 82.6 1.1 3.0 113.6 2.1 4.9 99.4 1.1 - 12.4 1.0 1.0 - - - 5.7 0.0 - 3.4 0.0 - 21.5 1.1 1.0 3rd Party 94% 92% 33% 70% 93% 20% ------Equipment Failure 4% 1% - - - - 83% 88% ------82% 89% - 13% 3% - Operation 1% 7% - 30% 7% 19% 14% 9% ------74% 58% - 18% 11% - 22% 2% - Other - - 67% ------100% ------100% Vegetation/Animal - - - - - 61% 3% 3% - 100% 100% - - - - 26% 42% - - - - 65% 94% - Weather/Fire/Earthquake ------PSPS ------

25 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 8 of 14 8

MARCUS(16KV) - Customers: 1,557 29.9 0.1 - 12.6 1.0 2.0 7.4 0.1 1.0 - - - 58.3 0.2 - - - 0.0 1442.1 1.2 - 1500.4 1.5 0.0 3rd Party - - - 68% 97% 50% - - 98% ------Equipment Failure 74% 70% - 32% 3% - 95% 84% - - - - 51% 80% ------2% 13% - Operation ------2% - - - 1% 12% - - - 100% - - - 0% 2% 100% Other 17% 15% - - - 50% ------48% 8% ------2% 1% - Vegetation/Animal 9% 15% - - - - 5% 16% ------Weather/Fire/Earthquake ------PSPS ------100% 100% - 96% 83% - MAXIMUS(16KV) - Customers: 2,701 2.8 0.0 1.0 14.7 0.0 1.0 51.5 1.0 - - - - 0.8 0.0 - 36.1 0.2 1.0 - - - 36.9 0.3 1.0 3rd Party ------Equipment Failure - - 100% 100% 100% - 100% 100% ------97% 92% - - - - 95% 83% - Operation 100% 100% - - - - 0% 0% - - - - 100% 100% - 3% 8% - - - - 5% 17% - Other - - - - - 100% ------Vegetation/Animal ------100% - - - - - 100% Weather/Fire/Earthquake ------PSPS ------MCBEAN(16KV) - Customers: 3,039 15.9 0.0 - 15.9 0.1 1.0 68.7 1.6 3.4 - - - 98.0 2.0 1.0 9.8 0.1 - 215.6 1.0 - 323.3 3.0 1.0 3rd Party ------Equipment Failure 100% 100% - 97% 95% 100% 88% 97% 42% - - - 67% 78% 43% 91% 48% - 100% 100% - 90% 84% 43% Operation ------9% 52% - - - - 0% 2% - Other - - - 3% 5% - 7% 2% 58% ------Vegetation/Animal ------33% 22% 57% ------10% 14% 57% Weather/Fire/Earthquake ------6% 0% ------PSPS ------MENTRY(16KV) - Customers: 2,097 120.8 1.8 - 77.3 1.1 - 7.1 0.0 1.0 3.3 0.0 - 1.4 0.1 2.1 0.5 0.0 - - - - 5.2 0.1 2.1 3rd Party 12% 2% - 87% 90% ------Equipment Failure 84% 97% - 1% 0% - 100% 100% - 100% 100% ------64% 19% - Operation 4% 1% - 12% 10% ------100% 100% - 100% 100% - - - - 36% 81% - Other ------100% ------Vegetation/Animal ------100% ------100% Weather/Fire/Earthquake ------PSPS ------

26 CircuitHistory Reliability Histories for Individual Circuits Serving Santa Clarita - 9 of 14 9

MINT CANYON(16KV) - Customers: 1,202 0.9 0.0 - 149.4 1.5 0.5 0.6 0.0 ------12.6 0.1 - - - - 12.6 0.1 - 3rd Party ------100% 100% ------Equipment Failure - - - 100% 100% 100% ------49% 36% - - - - 49% 36% - Operation ------51% 64% - - - - 51% 64% - Other 100% 100% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------MOCCASIN(16KV) - Customers: 1,449 295.1 2.0 1.0 76.1 1.8 2.2 132.5 1.1 0.8 16.0 1.0 1.0 2.3 0.0 0.4 13.0 0.0 - 16.5 0.1 - 47.8 1.2 1.4 3rd Party - - - 89% 98% 10% ------Equipment Failure 0% 0% - 8% 1% - 96% 97% 100% ------39% 23% - 100% 100% - 45% 11% - Operation ------1% 2% - - - - 100% 100% 100% 61% 77% - - - - 21% 5% 29% Other 100% 100% 100% - - - 3% 2% - - - 100% ------71% Vegetation/Animal - - - 2% 1% 90% - - - 100% 100% ------33% 84% - Weather/Fire/Earthquake ------PSPS ------MORRIE(16KV) - Customers: 258 79.9 1.0 - 110.3 1.0 - 86.5 0.3 1.0 38.5 0.4 2.4 44.6 1.9 0.9 129.0 1.0 - - - - 212.1 3.2 3.3 3rd Party ------Equipment Failure 94% 96% - 100% 100% - 100% 100% 100% - - - 100% 100% 100% 100% 100% - - - - 82% 89% 28% Operation 6% 4% ------100% 100% 100% ------18% 11% 72% Other ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------NEARGATE(16KV) - Customers: 1,681 407.7 2.1 3.4 77.7 0.6 0.2 197.0 2.1 1.1 5.5 0.8 0.2 42.5 0.2 0.8 2.2 0.0 - 173.2 1.0 - 223.4 2.0 1.0 3rd Party 28% 37% 6% 100% 100% 100% ------Equipment Failure 5% 9% 35% - - - 90% 93% - 1% 0% - 100% 100% 100% 92% 98% - 99% 100% - 97% 62% 79% Operation 5% 6% - - - - 10% 7% 11% - - - 0% 0% ------0% 0% - Other 62% 48% 59% - - - 0% 0% 89% 99% 100% 100% - - - 8% 2% - 1% 0% - 3% 38% 21% Vegetation/Animal ------0% 0% ------0% 0% - 0% 0% - Weather/Fire/Earthquake ------PSPS ------

27 Reliability Histories for Individual Circuits Serving Santa Clarita - 10 of 14

2017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020 4th Qtr 2020 2020 CircuitHistory10 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI

NERO(16KV) - Customers: 2,104 14.2 0.2 - 33.1 0.5 1.5 14.1 0.1 1.0 4.7 0.0 - - - - 1.0 0.0 - 4.8 0.1 - 10.6 0.1 - 3rd Party ------100% ------Equipment Failure 5% 2% - 100% 100% 35% 100% 100% - 100% 100% - - - - 40% 17% - - - - 49% 32% - Operation 37% 93% ------89% 88% - 40% 54% - Other - - - - - 65% ------Vegetation/Animal ------60% 83% - 11% 12% - 11% 14% - Weather/Fire/Earthquake 58% 5% ------PSPS ------NIGHTHAWK(16KV) - Customers: 337 291.4 1.2 3.8 3.7 0.0 3.0 62.2 0.2 3.4 - - - 118.1 1.0 ------118.1 1.0 - 3rd Party ------Equipment Failure - - - 21% 50% - 100% 100% 100% - - - 100% 100% ------100% 100% - Operation ------Other - - 78% ------Vegetation/Animal 1% 14% 22% - - 33% ------Weather/Fire/Earthquake 99% 86% - 79% 50% 67% ------PSPS ------ORION(16KV) - Customers: 3,056 53.6 1.1 4.0 21.8 0.2 0.1 122.6 0.9 - 0.1 0.0 1.0 131.7 1.0 - 69.4 1.1 0.0 - - - 201.2 2.1 1.0 3rd Party ------1% 0% 100% - - - 0% 0% 0% Equipment Failure - - - 43% 36% - 96% 96% - - - 100% 100% 100% ------65% 49% 100% Operation 100% 100% - 57% 64% 100% 4% 4% - 100% 100% - - - - 6% 3% - - - - 2% 2% - Other - - 75% ------94% 97% - - - - 32% 49% - Vegetation/Animal - - 25% ------Weather/Fire/Earthquake ------PSPS ------PLACERITA(16KV) - Customers: 1,341 231.7 1.0 - 9.1 0.0 - 12.2 0.2 ------3rd Party 100% 100% ------Equipment Failure - - - 100% 100% - 100% 100% ------Operation 0% 0% ------Other ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------

28 Reliability Histories for Individual Circuits Serving Santa Clarita - 11 of 14

2017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020 4th Qtr 2020 2020 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI CircuitHistory11SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI

POWELL(16KV) - Customers: 2,266 167.4 1.2 5.3 165.9 2.6 2.0 27.6 0.1 1.0 - - - 56.2 1.1 2.0 - - - 0.1 0.0 - 56.3 1.1 2.0 3rd Party ------Equipment Failure 41% 42% 70% 44% 39% - 85% 44% - - - - 88% 93% 50% - - - 100% 100% - 88% 93% 50% Operation 29% 9% - 39% 39% 50% 7% 47% - - - - 12% 7% ------12% 7% - Other 2% 3% 20% - - - 1% 1% 100% ------Vegetation/Animal - - - 17% 22% 50% 7% 9% ------50% ------50% Weather/Fire/Earthquake 28% 46% 10% ------PSPS ------PYTHON(16KV) - Customers: 1,483 274.0 4.0 2.4 87.5 2.0 6.2 3582.0 3.4 0.1 178.5 1.9 1.0 26.9 1.0 0.1 117.9 0.7 1.7 144.0 1.0 0.9 467.3 4.6 3.7 3rd Party 15% 24% 12% 38% 51% 28% ------100% 57% 51% 53% - - - 14% 8% 27% Equipment Failure 30% 46% 58% 10% 2% 4% 0% 2% - 93% 50% - 1% 0% - 8% 5% 0% - - - 38% 22% 0% Operation 2% 1% - 33% 40% 16% 2% 8% - - - - 99% 100% - 0% 1% - 0% 0% - 6% 21% - Other 49% 23% - 7% 3% - 3% 28% - 0% 0% 100% - - - - - 4% - - 9% 0% 0% 31% Vegetation/Animal - - 29% 12% 4% 52% 0% 4% 100% 7% 50% - - - - 34% 42% 42% 98% 98% - 41% 49% 20% Weather/Fire/Earthquake 4% 6% ------2% 2% 91% 1% 0% 22% PSPS ------94% 58% ------RACER(16KV) - Customers: 699 - - - 2.8 0.0 3.0 29.1 0.3 - 12.5 1.0 1.0 ------2519.5 3.1 - 2532.1 4.1 1.0 3rd Party - - - - - 33% ------Equipment Failure - - - 78% 53% - 100% 100% ------Operation ------Other ------100% ------100% Vegetation/Animal - - - 22% 47% 67% - - - 100% 100% ------0% 25% - Weather/Fire/Earthquake ------PSPS ------100% 100% - 100% 75% - RATTLER(16KV) - Customers: 3,212 11.9 0.1 1.0 108.3 1.3 4.0 69.1 1.2 1.1 149.9 1.2 1.9 0.3 0.0 - 5.2 0.0 - - - - 155.4 1.3 1.9 3rd Party - - - 30% 77% 25% ------Equipment Failure 100% 100% - 62% 19% - 93% 93% ------Operation - - - 8% 4% - 7% 7% 100% 92% 19% - 100% 100% - 100% 100% - - - - 92% 23% - Other ------100% ------100% Vegetation/Animal - - - - - 75% - - - 8% 81% ------8% 77% - Weather/Fire/Earthquake - - 100% ------PSPS ------

29 Reliability Histories for Individual Circuits Serving Santa Clarita - 12 of 14

2017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020 4th Qtr 2020 2020 SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFICircuitHistory12SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI

RINER(16KV) - Customers: 1,120 403.9 0.6 1.0 48.5 0.2 ------83.2 0.7 - - - - 83.2 0.7 - 3rd Party ------Equipment Failure 98% 90% 100% 68% 67% ------Operation 2% 10% - 32% 33% ------Other ------100% 100% - - - - 100% 100% - Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------ROMANUS(16KV) - Customers: 2,337 326.6 2.5 1.5 423.2 3.5 2.2 67.7 1.1 1.0 0.8 0.0 ------0.9 2.1 0.0 - 2.9 0.0 0.9 3rd Party ------Equipment Failure 94% 66% 87% 86% 94% 17% 100% 100% ------Operation 4% 1% - 14% 6% 37% - - - 100% 100% ------68% 50% - 78% 70% - Other - - - - - 46% ------32% 50% - 22% 30% - Vegetation/Animal 2% 33% 13% - - - - - 100% ------100% - - - - - 100% Weather/Fire/Earthquake ------PSPS ------SAND CANYON(16KV) - Customers: 2,156 36.0 0.2 2.0 18.4 0.1 0.1 3276.5 2.6 - 12.4 0.0 - 0.3 0.0 - 24.3 0.2 0.2 1747.7 2.3 1.1 1784.7 2.5 1.3 3rd Party - - - 21% 44% 100% ------0% 4% 6% 0% 3% 5% Equipment Failure 48% 19% - 55% 33% - 1% 5% - 100% 100% - 46% 67% - 65% 62% 38% 6% 36% 0% 8% 38% 7% Operation 20% 51% - 15% 20% - 0% 1% - - - - 54% 33% - 3% 21% - 0% 5% - 0% 7% - Other 5% 9% - 9% 4% ------62% - - 94% - - 88% Vegetation/Animal 2% 3% ------Weather/Fire/Earthquake 25% 18% 100% ------22% 14% - - - - 0% 1% - PSPS ------99% 94% ------11% 2% - 93% 55% - 92% 51% - STARFIGHTER(16KV) - Customers: 3,324 239.0 3.4 2.0 4.3 0.1 - 121.6 1.0 - - - - 284.1 2.6 ------284.1 2.6 - 3rd Party ------Equipment Failure 36% 25% 16% 54% 86% - 100% 100% - - - - 100% 100% ------100% 100% - Operation 43% 35% - 46% 14% - 0% 0% ------Other 5% 20% 68% ------Vegetation/Animal 16% 20% 16% ------Weather/Fire/Earthquake ------PSPS ------

30 Reliability Histories for Individual Circuits Serving Santa Clarita - 13 of 14

TIPS(16KV) - Customers: 542 - - - 9.7 1.0 - 67.6 1.0 1.0 ------3rd Party ------Equipment Failure - - - 100% 100% ------Operation ------7% 1% 100% ------Other ------Vegetation/Animal ------Weather/Fire/Earthquake ------93% 99% ------PSPS ------TOGA(16KV) - Customers: 1,995 22.1 0.1 - 311.8 1.3 1.3 18.9 0.3 1.0 ------1.1 - - - - - 1.1 3rd Party ------15% 1% 100% ------Equipment Failure 74% 74% - 74% 63% 26% 67% 81% ------Operation 25% 23% - 26% 37% - 14% 17% ------Other 2% 3% - - - 74% 4% 1% ------Vegetation/Animal ------100% - - - - - 100% Weather/Fire/Earthquake ------PSPS ------VAL VERDE(16KV) - Customers: 159 3.4 0.4 0.6 20.9 0.1 - 67.1 1.0 - 3.8 0.0 ------56.4 1.0 - 60.2 1.0 - 3rd Party ------100% 100% ------6% 1% - Equipment Failure 100% 100% 100% 64% 42% - 100% 100% ------Operation ------Other ------Vegetation/Animal - - - 36% 58% ------100% 100% - 94% 99% - Weather/Fire/Earthquake ------PSPS ------VASQUEZ(16KV) - Customers: 2,199 37.2 0.2 - 19.1 0.5 0.5 102.7 1.0 0.0 ------75.3 1.1 - - - 1.0 75.3 1.1 1.0 3rd Party ------Equipment Failure 35% 40% - 76% 16% - 98% 97% 100% ------99% 98% - - - - 99% 98% - Operation 14% 22% - 10% 2% - 2% 3% ------1% 2% - - - - 1% 2% - Other 51% 38% - 14% 82% 100% ------100% - - 100% Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------

31 Reliability Histories for Individual Circuits Serving Santa Clarita - 14 of 14

WILDWOOD(16KV) - Customers: 2,305 34.4 0.5 - 1.0 0.0 0.0 10.7 0.1 0.9 21.3 0.3 0.7 0.5 0.1 - 2.6 0.1 0.0 - - - 24.4 0.5 0.8 3rd Party ------Equipment Failure 39% 22% - 100% 100% 100% 100% 100% - 100% 100% 100% - - - - - 56% - - - 87% 71% 99% Operation 61% 78% ------100% 100% - 100% 100% 44% - - - 13% 29% 1% Other ------100% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------WILEY(16KV) - Customers: 2,393 35.4 0.1 1.0 319.0 1.9 - 227.9 1.2 2.0 11.3 0.0 - - - - 6.2 0.0 0.0 6.8 0.0 - 24.3 0.1 0.0 3rd Party ------Equipment Failure 98% 60% - 100% 99% - 92% 92% 50% 100% 100% - - - - 100% 100% 100% 100% 100% - 100% 100% 100% Operation 2% 40% - 0% 1% - 8% 8% ------Other - - 100% - - - - - 50% ------Vegetation/Animal ------Weather/Fire/Earthquake ------PSPS ------