5/17/2000Summer Preparedness 20001. 5/17/2000Summer Preparedness 20002 SRP SUMMER PREPAREDNESS 2000 Presented to the Arizona Corporation Commission May

5/17/2000 Summer Preparedness 2000 1


SRPSRPSUMMER PREPAREDNESSSUMMER PREPAREDNESS20002000

Presented to thePresented to the

Arizona Corporation Arizona Corporation CommissionCommission

May 17, 2000May 17, 2000


Dave AreghiniDave Areghini

Associate General Manager,Associate General Manager,

Power, Construction andPower, Construction and

Engineering ServicesEngineering Services


AGENDAAGENDA

Summary of Year 2000 Projected Summary of Year 2000 Projected Conditions and SRP Generating Plant Conditions and SRP Generating Plant ReadinessReadiness

Resources and ReservesResources and Reserves

SRP Transmission and DistributionSRP Transmission and DistributionSystem ReadinessSystem Readiness

Emergency Operations and Load Emergency Operations and Load SheddingShedding


SUMMARY OF YEAR 2000 SUMMARY OF YEAR 2000 PROJECTED CONDITIONSPROJECTED CONDITIONS

Transmission is adequate to meet Transmission is adequate to meet the forecasted peak load and the forecasted peak load and reservesreserves

SRP generation is ready and SRP generation is ready and purchases are adequate to meet the purchases are adequate to meet the forecasted year 2000 demandforecasted year 2000 demand

Emergency plans are in place to Emergency plans are in place to handle contingency eventshandle contingency events


John CogginsJohn Coggins

ManagerManager

Supply and TradingSupply and Trading


OPERATING RESERVESOPERATING RESERVES

Protect Against Loss of Generation Protect Against Loss of Generation or Transmission Resources Used to or Transmission Resources Used to Deliver Energy to Firm Load Deliver Energy to Firm Load

Targeted Reserve Levels Based on:Targeted Reserve Levels Based on:• Amount of Firm LoadAmount of Firm Load• Largest Single HazardLargest Single Hazard


SUMMER 2000 RESERVESSUMMER 2000 RESERVES

JunJun JulJul AugAug SepSep

Load (MW)Load (MW) 48714871 50845084 5084508446964696

Actual Reserves*Actual Reserves* 624624 636636 624624 624624

Reserves Reserves

Inside ValleyInside Valley 447447 209209 277277 624624

Outside ValleyOutside Valley 177177 427427 347347 00* * Meets WSCC and NERC Criteria Meets WSCC and NERC Criteria Meets Southwest Reserve Sharing Group Meets Southwest Reserve Sharing Group

CriteriaCriteria


WWWW

LBLB

KY/SKKY/SK

MDMD

NVNV

PPPP

FC/CR/HYFC/CR/HY

COCO

SRP Distribution SRP Distribution TerritoryTerritory

Valley Reserves Valley Reserves

209 MW209 MW

Available Import Available Import Capability 0 MWCapability 0 MW

ALL UNITS ON LINE - JULYALL UNITS ON LINE - JULY

PVPV

Outside Valley Outside Valley Reserves 427 MWReserves 427 MW


RESULTRESULTPeak Load Day (5084 MW) in JulyPeak Load Day (5084 MW) in July

Outside Valley RecoveryOutside Valley Recovery– Full Recovery From Loss of Largest Generating UnitFull Recovery From Loss of Largest Generating Unit

andand– Full Recovery From Loss of Unit Less Than 245 MWFull Recovery From Loss of Unit Less Than 245 MW

Inside Valley RecoveryInside Valley Recovery– Full Recovery From Loss of Largest Generating UnitFull Recovery From Loss of Largest Generating Unit

andand– Full Recovery From Loss of Unit Less Than 28 MWFull Recovery From Loss of Unit Less Than 28 MW


COORDINATING VALLEY COORDINATING VALLEY UNIT COMMITMENTUNIT COMMITMENT

APSAPSMerchantMerchant

SRPSRPMerchantMerchant

SRPSRPCAOCAO

APSAPSCAOCAO


GLEN CANYON GLEN CANYON LOW FLOW TESTINGLOW FLOW TESTING

Test Flows Implemented May - SeptemberTest Flows Implemented May - September• Result of 1994 Biological Opinion by USF&WSResult of 1994 Biological Opinion by USF&WS• Requires Low Steady Flow At 8,000 cfs June - Requires Low Steady Flow At 8,000 cfs June -

SeptSept

Reduces Plant Output by Several Hundred Reduces Plant Output by Several Hundred

MWMW• Impacts Market Pricing in the SWImpacts Market Pricing in the SW• Impacts Exchange Arrangements with SRP Impacts Exchange Arrangements with SRP


GLEN CANYON GLEN CANYON LOW FLOW TESTINGLOW FLOW TESTING

Emergency Exception Criteria In Emergency Exception Criteria In EffectEffect• Activation Requires System Wide Activation Requires System Wide

EmergencyEmergency

Testing May Be Abandoned Due to Testing May Be Abandoned Due to

HydrologyHydrology


SRP TRANSMISSION SRP TRANSMISSION AND DISTRIBUTIONAND DISTRIBUTIONSYSTEM READINESSSYSTEM READINESS

Dave AreghiniDave Areghini


SYSTEM IMPROVEMENTSSYSTEM IMPROVEMENTS

Items Increasing Import Capability Items Increasing Import Capability

• Knox 230kV receiving station and Knox 230kV receiving station and 1-230/69 transformer1-230/69 transformer

• Four 46 MVAR 69kV capacitor banks at Four 46 MVAR 69kV capacitor banks at

Brandow, Brandow, Papago Buttes, White Tanks and KnoxPapago Buttes, White Tanks and Knox


SYSTEM IMPROVEMENTSSYSTEM IMPROVEMENTS

Items Serving Increasing Distribution Items Serving Increasing Distribution Load Load

• 22ndnd Ward 230/69kV transformer Ward 230/69kV transformer

• Multiple line upgradesMultiple line upgrades


Load Serving CapacityLoad Serving Capacity

N-0 Continuous & Emergency Limit 5339 MWN-0 Continuous & Emergency Limit 5339 MW

N-1 Continuous & Emergency Limit 5229 MW

Forecasted Base Peak 4970 MW

Forecasted Upper Peak 5084 MW


SYSTEM PREPARATIONSYSTEM PREPARATION

• Major Line PatrolsMajor Line Patrols• Preventative Preventative

MaintenanceMaintenance• Pole Work Pole Work • Personnel Training Personnel Training

• Tree TrimmingTree Trimming• Cable Cable

Replacement Replacement • Storm PlanStorm Plan

Summer Substation and Line Summer Substation and Line Maintenance CompleteMaintenance Complete


EMERGENCY OPERATIONS EMERGENCY OPERATIONS AND LOAD SHEDDINGAND LOAD SHEDDING

System NormalSystem Normal

Capacity CriticalCapacity Critical

Capacity EmergencyCapacity Emergency

Pre-load SheddingPre-load Shedding

Rotating BlackoutsRotating Blackouts


CAPACITY CRITICALCAPACITY CRITICAL

Potential for Operating Reserve Potential for Operating Reserve Deficiency if a Major Resource is Deficiency if a Major Resource is Lost Lost

Warning Issued to All PlantsWarning Issued to All Plants


CAPACITY EMERGENCYCAPACITY EMERGENCY

Potential for loss of load if a major Potential for loss of load if a major resourceresourceis lost (reserves are depleted)is lost (reserves are depleted)

Staff unmanned hydro unitsStaff unmanned hydro units

Stop maintenance that could jeopardizeStop maintenance that could jeopardizeunit availabilityunit availability


CAPACITY EMERGENCYCAPACITY EMERGENCY

Prepare to:Prepare to:• Cut wholesale salesCut wholesale sales• Utilize emergency generation, reduceUtilize emergency generation, reduce

auxiliary loads auxiliary loads


ROTATING BLACKOUTSROTATING BLACKOUTS

Predetermined program has Predetermined program has alreadyalreadyprotected critical loads such asprotected critical loads such ashospitalshospitals

Load shedding program curtails Load shedding program curtails delivery of power to retail delivery of power to retail customerscustomers


SRP Control Area Load

0

1000

2000

3000

4000

5000

6000

1 4 7 10 13 16 19 22

Hour

MW Series1

Series2


SUMMARY OF YEAR 2000 SUMMARY OF YEAR 2000 PROJECTED CONDITIONSPROJECTED CONDITIONS

Transmission is adequate to meet Transmission is adequate to meet the forecasted peak load and the forecasted peak load and reservesreserves

SRP generation is ready and SRP generation is ready and purchases are adequate to meet the purchases are adequate to meet the forecasted year 2000 demandforecasted year 2000 demand

Emergency plans are in place to Emergency plans are in place to handle contingency eventshandle contingency events




Documents

5/17/2000Summer Preparedness 20001. 5/17/2000Summer Preparedness 20002 SRP SUMMER PREPAREDNESS 2000 Presented to the Arizona Corporation Commission May