B. SCE Reliability ReportCirc uit Re liability Re view
Grand Te rrace
2021
•Southern California Edison (SCE) is an Edison International company
•One of the nation’s largestelectricutilities
•More than 130 year s of histor y
•Headquar tered in Rosemead, California
•Regulated by the California Public Utilities Commission (CPUC)and the Federal Energy Regulator y Commission (FERC)
•50,000 square miles of SCE ser vice 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
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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 –suppor ting energy storage,electric vehicles,and renewables
SCE plans to spend more than $5B eachyeartomaintain, improve, and hardenits infrastructure
SCE’s investments suppor t safe,reliable,affordable,and clean energy for our customers
2020 Capital Investments
235 miles of underground cable replaced
97 miles of overhead conductorreplacedforpublicsafety
11.1k distribution poles replaced
3.6k transmission poles replaced
79 underground structurereplacements
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Protecting Public Safety:Wildfire Mitigation Activities
2020 Year-End Progress Repor t –Data as of 12/31/20 5
Protecting Public Safety:Public Safety Power Shutoffs
•To reduce the threat of wildfires,SCEimplementsPublic Safety Power Shutoffs (PSPS)to temporarily shut off power to somecustomersinareaswithahighriskforwildfirestopreventtheelectricsystemfrombecomingthesourceofignition
•PSPS is used as a measure of last resor t toprotectpublicsafetyunderdangerousfireweatherconditions, including high winds, low humidity,and dr y vegetation
•Multiple methods are used to notif y people inaffectedareasbefore,during and af ter a PSPSevent
•SCE provides resources to suppor t customers during PSPS and offers several programs andrebatestohelpcustomersbepreparedand more resilient during emergencies
•SCE is working to reduce the impact of PSPSand is continuing to strengthen the electric grid to become more resilient in the face ofextremeweatherevents 6
Pathway 2045:Key steps California must take to reach carbon neutrality
Creating a Clean Energy Future
100%of grid sales with carbon-free electricity
80 GW of utility-scale clean generation
30 GW of utility-scaleenergy storage
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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 Over view
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 > 5minutes
•Momentar y Outage = An outage lasting ≤5minutes
•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.Statisticall y,days having a daily
system SAIDI greater than a threshold value are days on which the energy delivery system experienced stresses beyond th at 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.
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How Do We Measure Reliability?
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Over view of Grand Terrace
There are 5 circuits that ser ve Grand Terr ace 1
Gran d Total 8,166
Note:The number of customers listed represents
the total number of customers on each circuit
(not the local jurisdiction).
Circuit Type Customers Circuit Type Customers Circuit Type Customers Circuit Type Customers
COOLEY(12KV)1,615
DOMIC(12KV)1,274
GLOBE MILLS(12KV)889
PRESTON(12KV)2,445
URBITA(12KV)1,943
SCE SYST E MWID E
**Da ta is as o f 03/16/2021,data
can b e s lig htly d iffer ent d ue to
o utage data va lidatio n p r o cess
Gra nd Terra ce
Re lia bility His tor y of Circuits Ser vin g G r a n d Te rra c e (No E xc l usi o ns)
**“Exclusions”ar e days which
utilities ar e allo wed to r emo ve
fro m their metr ics because
the o utages o n tho se days
wer e caused b y a cts of nature.
437.0
80.8 66.1
422.0
139.7 136.8 178.0 201.3
15 0.0
10 0.0
50 .0
0.0
25 0.0
50 0.0
45 0.0
40 0.0
35 0.0
20 17 20 18 2019 20 20
SA ID I
m inutes o f
susta ine d
interrup tio ns)
2.1
1.3
1.0
1.9
1.2
0.9 1.0 1.1
0.0
0.5
1.0
1.5
2.0
2.5
SA IF I(avera g e
freque ncy o f
sustained
inte rrup tio ns)
2.4
12
2.0
1.0
1.61.8
1.4 1.4 1.4
1.0
0.5
0.0
1.5
2.0
2.5
3.0
M A IFI(avera g e
frequency ofmomentary
interrup ti o ns)
S A ID I =the cu m u lativ e a m o unt of tim e the a v er a ge custom er is in terru pted by “s ustain ed”ou tages each y ea r .
C a use s o f R e pai r O u tag e s i n G r a n d Te rra ce
2020
W eath er /F ir e
/Ear th qu a ke36.0 %
13
O ther
33.0 %
E qu ipm en t Failur e
30.3 %
O per atio n
0 .5 %
3rd Par ty
0 .1 %
Vegeta tio n /Anim al
0 .0 %P S PS
0 .0 %
C o n tr i b u ti o n s t o
S A I D I by O u t a g e Cause▪Equipme nt Failur e
e.g .,in -s ervice f ailu r e of
tr an s former,s witch,or
conductor s
▪Ve g etat ion/A nim al
e.g ., tr ee br a nch,r oden t,
o r b ir d c aus ing a s hor t
cir cuit b etw een
conductor s
▪O t he r e.g.,patr o lled
but no c aus e f ound
▪O pe r at ions e.g.,ur gent
m a in ten ance w /o 3 -day
notice
▪3 rd Part y e.g.,b alloon,
c ar hit pole, d ig -in
▪PSPS e.g.,P ublic
S af ety P o w er S huto ff
S AIFI =the num ber of tim es the average custom er is interrupted by “sustained”outages each year
C o n tr ib u tio n s to SA I FI by O u tag e Cau s e
Other
37.2%
W eather /Fire
/Earth quake10.0 %
O per ation1.0 %3 r d Par ty
0 .1 %PS PS
Equipm ent Failure 0 .0 %51.7 %Vegetation /Anim al
0.0%
Ca use s of Re pa ir Outag e s in Gra nd Te rra ce
2020
C o n tr ib u tio n s to SA I FI by O u tag e Cau s e
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▪Equipment Failure
e.g.,in-s e rvice failure of
trans former,s witch,or conductors
▪Vegetation/A nimal
e.g.,tree branch,rodent,or bird
caus ing a short circuit betw een
conductors
▪Ot he r
e.g.,patrolled but no caus e found
▪Operations
e.g., urgent maintenance w /o 3 -day
notice
▪3rd Party
e.g.,balloon,car hit pole,dig-in
▪PSPS
e.g.,Public Safety Pow er Shutoff
Equipm ent Failure
51.7 %
Other
37.2 %
W eather /Fire
/Ear thquake10.0 %O per ation
1 .0 %
3 rd Party
0 .1 %
Vegetation /Anim al
0 .0 %P S PS
0 .0 %
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Back-up Slides
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Reliability Histories of Circuits Serving Grand Terrace
Updated through Dec 2020
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AverageRe liabilityof5CircuitsServing Grand Terrace
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)ou tages.
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.
2017 2018 2019 1st Qtr2020 2ndQtr202
0 3rd Qtr2020 4thQtr202
0 2020
SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI SAIDI SAIFI MAIFI5CircuitsServingGrand
Terrace --Total
Customers:8,166
437.0 2.1 2.4 80.8 1.3 2.0 66.1 1.0 1.0 1.7 0.0 0.3 24.1 0.1 0.3 162.3 1.0 0.7 234.0 0.7 0.4 422.0 1.9 1.6
3rd Party 6%17%33%22%20%40%16%33%29%15%4%-1%1%48%--23%---0%0%18%Equipment Failure 11%19%7%63%63%15%61%52%50%12%18%-99%99%52%42%67%23%16%24%14%30%52%22%Operation 15%27%14%4%15%1%3%1%21%7%21%-0%0%-1%1%-0%0%11%1%1%3%
Other --23%10%2%22%19%12%---100%---58%32%54%20%51%75%33%37%58%Vegetation/Animal ---0%0%21%------------------
Weather/Fire/Earthquake 69%37%22%---1%2%-67%57%-------65%25%-36%10%-
PSPS ------------------------
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
CircuitHistory1
19
ReliabilityHistories for Individual CircuitsServingGrand Terrace -1of 2
2017 2018 2019 1st Qtr2020 2nd Qtr 2020 3rd Qtr2020 4th Qtr202 0 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
COOLEY(12KV)-Customers:1,615 684.3 1.8 1.7 ---78.8 1.9 2.0 ------0.8 0.0 -188.7 0.2 -189.6 0.2 -
3rd Party --55%---------------------
Equipment Failure 8%50%45%---94%95%50%------100%100%----0%0%-
Operation ------4%0%50%---------------
Other ------------------100%100%-100%100%-
Vegetation/Animal ------------------------
Weather/Fire/Earthquake 92%50%----3%4%----------------
PSPS ------------------------
DOMIC(12KV)-Customers:1,274 313.5 3.9 4.4 88.0 2.2 4.2 69.3 2.1 1.8 9.1 0.0 -0.3 0.0 0.8 84.1 1.1 2.1 82.9 0.0 2.0 176.5 1.1 4.9
3rd Party --37%--23%83%98%100%18%7%-100%100%100%--50%---1%0%38%Equipment Failure 32%21%-57%52%26%15%2%-------98%98%50%---47%91%21%Operation 27%53%-7%43%-2%0%-3%2%----2%2%-6%33%-4%3%-
Other --41%37%5%26%1%0%------------100%--41%Vegetation/Animal -----26%------------------
Weather/Fire/Earthquake 42%26%22%------79%91%-------94%67%-48%5%-
PSPS ------------------------
GLOBE MILLS(12KV)-Customers:889 128.0 1.8 1.0 35.9 1.0 2.0 111.6 1.1 ---2.5 ---15.2 1.0 -334.4 1.6 1.0 349.6 2.6 3.4
3rd Party ---94%99%-------------------
Equipment Failure 48%7%-5%1%-1%5%-------100%100%-100%100%57%100%100%16%Operation 29%38%----3%0%------------43%--12%Other ------96%95%---100%-----------72%Vegetation/Animal ---2%1%100%------------------
Weather/Fire/Earthquake 23%55%100%---------------------
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ReliabilityHistories for Individual CircuitsServingGrand Terrace -2of 2
2017 2018 2019 1st Qtr2020 2nd Qtr 2020 3rd Qtr2020 4th Qtr2020 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
URBITA(12KV)-Customers:1,943 26.0 0.0 2.1 127.2 1.7 2.5 82.4 0.6 0.5 ---98.9 0.5 0.6 2.5 0.0 -583.5 0.7 -684.9 1.2 0.6
3rd Party ---1%1%81%6%6%----------------
Equipment Failure 99%97%-93%94%19%88%87%100%---100%100%100%36%33%-0%0%-15%39%100%Operation --48%6%5%-4%5%-------64%67%----0%1%-
Other ------2%2%----------------
Vegetation/Animal ------------------------
Weather/Fire/Earthquake 1%3%52%---------------100%100%-85%60%-
PSPS ------------------------
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