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Circuit Reliability Review
Inyo District 1
2021
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• 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
Who We Are
Our Grid
To deliver safe, reliable, and affordable power,
we monitor and maintain a vast electricity system
730,000 Transformers
119,000 Miles of Transmission and Distribution Lines
4,600 Circuits
1.4 Million Poles
50,000 Square Miles
3
Strengthening and Modernizing the Grid
• Infrastructure reliability – updating
underground cables, poles, switches, and
transformers
• Wildfire mitigation – hardening infrastructure,
bolstering situational awareness capabilities,
and enhancing operational practices
• Transmission – connecting renewables,
installing new substations, and updating lines
• Grid readiness – updating the grid for impacts
from new technologies
• Long-term energy policy – supporting energy
storage, electric vehicles, and renewables
SCE plans to spend more than $5B each
year to maintain, improve, and harden
its infrastructure
SCE’s investments support safe, reliable, affordable, and clean energy for our customers
2020 Capital Investments
235 miles of
underground cable replaced
97 miles of overhead conductor
replaced for public safety
11.1k distribution poles replaced
3.6k transmission poles replaced
79 underground structure
replacements
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
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• 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
Pathway 2045: Key steps California must take to reach carbon neutrality
Creating a Clean Energy Future
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100% of grid sales with
carbon-free electricity
80 GW of utility-scale
clean generation
30 GW of utility-scale
energy storage
70% of all buildings will
use efficient electric
space and water heating
90% fewer GHG
emissions from all-
electric homes
26 million electric
vehicles
Over 1 million
electrified medium
and heavy duty
vehicles
50% reduction in natural
gas consumption
40% of the remaining
natural gas is
biomethane and
hydrogen
Reliability Overview
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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)
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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.
How Do We Measure Reliability?
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11Overview of Inyo District 1There are 7 circuits that serve Inyo District 1 1
Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers
BIRCHIM(12KV) 503 - - -
CHALFANT(12KV) 313 - - -
EARLEY(2.4KV) - - - -
INYO LUMBER(12KV) 2,414 - - -
SABRINA(12KV) 175 - - -
UNDERWOOD(12KV) 1,739 - - -
SINKER(12KV) 10 - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
Grand Total 5,154
Note: The number of customers listed represents the total number of customers on each circuit (not the local jurisdiction).
11
BarChart
SCE SYSTEMWIDE
**Data is as of 03/16/2021, data
can be slightly different due to
outage data validation process
Inyo District 1
Reliability History of Circuits Serving Inyo District 1 (No Exclusions)
**“Exclusions” are days which
utilities are allowed to remove
from their metrics because
the outages on those days
were caused by acts of
nature.
87.5
153.4
426.3
148.7139.7 136.8
178.0201.3
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
450.0
2017 2018 2019 2020
SAIDI
(average
minutes of
sustained
interruptions)
0.6 0.6
1.8
0.9
1.2
0.91.0
1.1
0.0
0.5
1.0
1.5
2.0
SAIFI
(average
frequency of
sustained
interruptions)
1.0
1.5
0.7 0.7
1.8
1.41.4 1.4
0.0
0.5
1.0
1.5
2.0
MAIFI
(average
frequency of
momentary
interruptions)
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SAIDIChart
SAIDI = the cumulative amount of time the average customer is interrupted by “sustained” outages each year.
Causes of Repair Outages in Inyo District 1
2020
Other
40.8%
PSPS
26.5% Weather /Fire
/Earthquake
17.3%
Equipment Failure
11.1%
3rd Party
4.1%Operation
0.1%
Vegetation /Animal
0.0%
Contributions to
SAIDI by Outage Cause▪ Equipment Failure e.g., in-service failure of transformer, switch, or conductors▪Vegetation/Animale.g., tree branch, rodent, or bird causing a short circuit betweenconductors▪ Other e.g., patrolled but no cause found▪ Operations e.g., urgent maintenance w/o 3-daynotice▪ 3rd Party e.g., balloon, car hit pole, dig-in
▪ PSPS e.g., Public
Safety Power Shutoff
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SAIFIChart
SAIFI = the number of times the average customer is interrupted by “sustained” outages each year
Causes of Repair Outages in Inyo District 1
2020
Weather /Fire
/Earthquake
33.4%
3rd Party
32.7%
Other
24.1%
Equipment
Failure…
PSPS
3.7%
Operation
0.1%
Vegetation /Animal
0.0%
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 birdcausing a short circuit between conductors
▪ Othere.g., patrolled but no cause found
▪ Operationse.g., urgent maintenance w/o 3-daynotice▪ 3rd Party e.g., balloon, car hit pole, dig-in
▪ PSPS
e.g., Public Safety Power ShutoffWeather /Fire
/Earthquake
33.4%
3rd Party
32.7%
Other
24.1%
Equipment
Failure
6.0%
PSPS
3.7%
Operation
0.1%
Vegetation /Animal
0.0%
Contributions to SAIFI by Outage Cause
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15
16
Back-up Slides
Reliability Histories of Circuits Serving Inyo District 1
Updated through Dec 2020
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CitySummary
SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI
87.5 0.6 1.0 153.4 0.6 1.5 426.3 1.8 0.7 43.1 0.0 0.2 56.3 0.8 0.4 0.1 0.0 0.1 49.2 0.1 0.1 148.7 0.9 0.7
3rd Party 24% 16% 7% - - - 7% 5% - - - - 11% 38% - 21% 40% - - - - 4% 33% -
Equipment Failure 44% 37% 22% 15% 58% 11% 19% 23% 48% 1% 2% 100% 29% 7% 18% 79% 60% - 0% 0% - 11% 6% 32%
Operation 16% 29% 19% 10% 12% 32% 3% 52% - 0% 4% - - - 16% - - - - - - 0% 0% 9%
Other 11% 16% 42% 1% 2% 46% 9% 4% 43% 99% 94% 0% 15% 16% 65% - - 100% 20% 68% 45% 41% 24% 52%
Vegetation/Animal - - 10% 2% 7% 7% 0% 0% 9% - - - - - - - - - - - - - - -
Weather/Fire/Earthquake 4% 1% - 72% 21% 4% 1% 2% - - - - 46% 39% - - - - - - - 17% 33% -
PSPS - - - - - - 60% 14% - - - - - - - - - - 80% 32% 55% 27% 4% 7%
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
Average Reliability of 7 Circuits Serving Inyo District 1
4th Qtr 2020 20202017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020
6 Circuits Serving Inyo District 1 -- Total
Customers: 5,154
Notes:
No outages are excluded from the metrics.
Outage Causes: Other: e.g., patrolled but no cause could be foundOperations: e.g., urgent maintenance w/o 3-day notice to customers3rd Party: e.g., balloons, car hit pole, dig-inVegetation/Animal: e.g., tree branch, rodent, or bird causing short circuit across conductorsPSPS: 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.
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CircuitHistory1
SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI
BIRCHIM(12KV) - Customers: 503 161.6 1.8 1.0 71.5 0.4 1.0 1847.8 3.0 0.9 3.0 0.0 1.6 58.0 0.3 - 0.4 0.0 - 404.0 0.4 0.5 465.4 0.7 2.0
3rd Party - - - - - - - - - - - - - - - - - - - - - - - -
Equipment Failure 1% 1% - 98% 97% 1% 0% 0% - 100% 100% 100% 87% 67% - 100% 100% - - - - 12% 31% 77%
Operation 44% 56% 100% 2% 3% - 1% 34% - - - - - - - - - - - - - - - -
Other 37% 40% - - - 99% - - 100% - - 0% 10% 6% - - - - - - - 1% 3% 0%
Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - -
Weather/Fire/Earthquake 18% 3% - - - - - - - - - - 3% 27% - - - - - - - 0% 12% -
PSPS - - - - - - 99% 66% - - - - - - - - - - 100% 100% 100% 87% 54% 23%
CHALFANT(12KV) - Customers: 313 14.7 0.6 3.1 1977.5 2.0 3.2 597.9 1.2 4.0 - - - 128.7 2.1 6.4 - - 1.0 0.9 0.0 - 129.6 2.1 7.4
3rd Party 54% 33% - - - - - - - - - - - - - - - - - - - - - -
Equipment Failure - - - 0% 0% - 0% 0% - - - - - - 18% - - - 100% 100% - 1% 0% 16%
Operation 46% 67% - 11% 50% - 1% 13% - - - - - - 16% - - - - - - - - 14%
Other - - 94% - - 37% 98% 84% 75% - - - 100% 100% 65% - - 100% - - - 99% 100% 70%
Vegetation/Animal - - 6% - - 31% 1% 3% 25% - - - - - - - - - - - - - - -
Weather/Fire/Earthquake - - - 89% 50% 31% - - - - - - - - - - - - - - - - - -
PSPS - - - - - - - - - - - - - - - - - - - - - - - -
INYO LUMBER(12KV) - Customers: 2,414 94.5 0.5 0.9 12.0 0.2 2.0 130.2 1.5 0.0 0.0 0.0 - 90.9 1.4 - 0.0 0.0 - - - - 91.0 1.4 -
3rd Party - - - - - - - - - - - - 14% 48% - 100% 100% - - - - 14% 48% -
Equipment Failure 86% 84% 55% 19% 29% - 91% 34% 100% - - - 26% 5% - - - - - - - 26% 5% -
Operation 7% 12% 22% 32% 6% 50% 6% 65% - 100% 100% - - - - - - - - - - 0% 0% -
Other 7% 5% 10% 5% 3% 50% 2% 1% - - - - - - - - - - - - - - - -
Vegetation/Animal - - 13% - - - - - - - - - - - - - - - - - - - - -
Weather/Fire/Earthquake - - - 43% 62% - - - - - - - 60% 48% - - - - - - - 60% 48% -
PSPS - - - - - - - - - - - - - - - - - - - - - - - -
SABRINA(12KV) - Customers: 175 3.1 0.0 4.0 78.7 1.1 1.9 1895.4 3.0 0.0 1255.8 0.8 - - - - - - - 285.0 2.1 1.1 1540.8 3.0 1.1
3rd Party - - - - - - - - - - - - - - - - - - - - - - - -
Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - -
Operation 100% 100% - - - - 8% 33% - - - - - - - - - - - - - - - -
Other - - 75% 13% 9% 47% - - 100% 100% 100% - - - - - - - 100% 100% 100% 100% 100% 100%
Vegetation/Animal - - 25% 83% 90% 53% - - - - - - - - - - - - - - - - - -
Weather/Fire/Earthquake - - - 5% 0% - 7% 34% - - - - - - - - - - - - - - - -
PSPS - - - - - - 85% 33% - - - - - - - - - - - - - - - -
Reliability Histories for Individual Circuits Serving Inyo District 1 - 1 of 2
2017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020 4th Qtr 2020 2020
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CircuitHistory2
SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI
SINKER(12KV) - Customers: 10 159.8 0.2 - - - - - - - - - - - - - - - - - - - - - -
3rd Party - - - - - - - - - - - - - - - - - - - - - - - -
Equipment Failure - - - - - - - - - - - - - - - - - - - - - - - -
Operation - - - - - - - - - - - - - - - - - - - - - - - -
Other 100% 100% - - - - - - - - - - - - - - - - - - - - - -
Vegetation/Animal - - - - - - - - - - - - - - - - - - - - - - - -
Weather/Fire/Earthquake - - - - - - - - - - - - - - - - - - - - - - - -
PSPS - - - - - - - - - - - - - - - - - - - - - - - -
UNDERWOOD(12KV) - Customers: 1,739 75.9 0.3 0.5 46.6 0.8 0.5 186.2 1.8 1.0 0.6 0.0 - 0.7 0.0 - 0.1 0.0 - - - - 1.3 0.0 -
3rd Party 87% 93% 44% - - - 51% 16% - - - - - - - - - - - - - - - -
Equipment Failure 0% 1% - 97% 99% 100% 42% 29% 100% - - - 100% 100% - 100% 100% - - - - 57% 86% -
Operation 13% 7% - - - - 5% 54% - 100% 100% - - - - - - - - - - 43% 14% -
Other - - 56% 3% 1% - 0% 0% - - - - - - - - - - - - - - - -
Vegetation/Animal - - - - - - 1% 0% - - - - - - - - - - - - - - - -
Weather/Fire/Earthquake - - - - - - 1% 0% - - - - - - - - - - - - - - - -
PSPS - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
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- - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - -
Reliability Histories for Individual Circuits Serving Inyo District 1 - 2 of 2
2017 2018 2019 1st Qtr 2020 2nd Qtr 2020 3rd Qtr 2020 4th Qtr 2020 2020
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