WIXLIB

WelcomeLiberty Utilities ReliabilityReporting Workshop for2019 Calendar YearDecember 2, 20201

Virtual Meeting Info for You The audience will be on mute. Youwill be able to hear and see thepresenters. If you have questions, please typethem in the chat/question box areawhich should be to the right of yourscreen. Questions will be answered at theend of the presentation. Sometimes there can be technicaldifficulties. Please bear with us incase we need to work throughthem.

Agenda Purpose of Workshops System Overview Key Utility Initiatives Reliability Performance Questions

Service Territory Overview Purchased NV Energy’s (SPPCo)California service territory in 2011 1,476 square miles; 49,000 customers Two office locations: South LakeTahoe and Tahoe Vista Pay 2.8 million in annual propertytaxes and franchise fees in 7counties Approximately 100 employeescurrently Regulated by the California PublicUtilities Commission (CPUC) Winter Peaking Utility4

Service Territory Overview 1,880 miles Distribution lines 1,400 Overhead (O/H) 480 Underground (U/G) 13 Substations 12MW of Emergency DieselGeneration Max System Load: 144.5 MW (Dec 2012) 88% Residential, 12% Commercial5

Where Does The Power Come From6

Factors for Customer Satisfaction Reliability Safe Service Outage Notification7

Outage Reporting and TrackingPlease Call 1-844-245-68688

Customer Notifications9

Power System Overview10

Power Outage Causes Weather (wind, snow, ice build up, lightening) Animals (birds, squirrels, snakes) Third Party Damage (motor vehicle accident) Equipment Failure (cable faults, transformer) Vegetation (trees, wild fire) Loss of Source Power from NV Energy11

Momentary vs. SustainedMomentaryOutages that are less than or equalto 5 minutes in durationEx: Tree branches contact apower line, burns the branchclear, and the circuit reclosesautomaticallySustainedOutages that are greater than 5minutes in durationEX: Tree falls through the powerline and must be removedbefore re-energizing the line12

Planned vs Major Outages Planned OutageOutages where a customer orpublic official has made a request,or Liberty has provided notificationThese are excluded from reliabilitymetricsMajor EventInstitute of Electrical and ElectronicEngineers (IEEE) standard 13662012, a set of outages that exceedthe historically expected outageduration (SAIDI) for at least oneday13

Measuring ReliabilityEvery outage is analyzedto determine the following metrics:𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝒐𝒐𝒐𝒐 ��𝑪𝑪𝑪 ��𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰 ��𝑫𝑫𝑫𝑫𝑫SAIDI 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏 𝒐𝒐𝒐𝒐 ��𝒄𝒄𝒄𝒄𝒄 ��𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵 𝒐𝒐𝒐𝒐 ��𝑪𝑪𝑪𝑪𝑪 ��𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰SAIFI 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏 𝒐𝒐𝒐𝒐 ��𝒄𝒄𝒄𝒄𝒄 IDI𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 ��𝑪𝑪𝑪 ��𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰𝑰 ��𝑫𝑫𝑫𝑫𝑫 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵𝑵 𝒐𝒐𝒐𝒐 ��𝑪𝑪𝑪 𝒐𝒐𝒐 ��𝑪𝑪𝑪 ��𝑴𝑴𝑴𝑴𝑴 𝑰MAIFI 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏𝒏 𝒐𝒐𝒐𝒐 ��𝒄𝒄𝒄𝒄𝒄 𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔14

SAIDI System PerformanceDistribution System Indices MED Excluded 142015201620172018201915

SAIFI System PerformanceDistribution System Indices MED Excluded 18201916

CAIDI System PerformanceDistribution System Indices MED Excluded 0142015201620172018201917

MAIFI System PerformanceDistribution System Indices MED Excluded 18201918

Worst Performing CircuitsCircuitCustomersSubstationCircuit 23.8%730407.12Analysis of worst performing circuits excludes plannedand Major Event outages.The preferred metric for this analysis is the 3 yearaverage circuit level SAIDI in order to account forpopulation discrepancies between urban and ruralcircuits.19

Washoe 201 Circuit Services Floriston Approximately 70 customers 247 poles 8.7 miles O/H Radial source from NVEnergy’s substation locatednear Mogul(additional 5 miles)20

Reliability TrendWashoe 201 Reliability 019021

Significant OutagesMarch 25th 2019 Loss of source from NV Energy. Downed wire found across Hwy. Outage Time - 9 hours and 17 minutesJuly 10, 2017 Wildfire in the area burned several poles After the fire was contained and Liberty wasgranted access, generators were brought in torestore service to Floriston while the line was rebuilt. Outage Time - 38 hours22

Topaz 1261 Circuit Services Coleville,Walker Approximately 750customers 1,281 poles 69.1 miles O/H 7.7 miles U/G Radial source fromSmith Valley, NV23

Reliability TrendTopaz 1261 Reliability 1720182019024

Significant OutagesMarch 15, 2019 Outage for all customers on Topaz 1261 Downed wire Outage Time – Partially Restored 2 hours and24 minutes; Fully Restored 4 hours 36 minutesMarch 22, 2019 Incorrect connections on generator totransformer Left entire feeder out of power Outage Time –32 hours 50% Restored; 48 hours66% Restored; 56 hours 90% Restored; 58 hoursFully Restored25

Reliability ImprovementsAn aggressive Vegetation Management program – about 4 million per year26

Improved Animal ProtectionPrecision fit animal guards are being implemented intoour substations to prevent wildlife outages.27

Wildfire Mitigation PlansSeveral projects are underway to reduce fire riskSome Projects include: Advanced weathermonitoring Covered Conductor Expulsion fuse replacement Additional recloserinstallations28

Thank youEmail: PowerQuality@libertyutilities.comOr call Customer Service at1-800-782-250629

Outage for all customers on Topaz 1261 Downed wire Outage Time - Partially Restored 2 hours and 24 minutes; Fully Restored 4 hours 36 minutes March 22, 2019 Incorrect connections on generator to transformer Left entire feeder out of power Outage Time -32 hours 50% Restored; 48 hours 66% Restored; 56 hours 90% Restored; 58 hours