03/22/07 ACC Open MeetingSummer Preparedness 20071 SRP Summer Preparedness 2007 Mike Hummel Manager – Supply & Trading and Gary Harper Manager - System

03/22/07 ACC Open Meeting Summer Preparedness 2007 1

SRP

Summer Preparedness 2007

Mike HummelManager – Supply & Trading

andGary Harper

Manager - System Operations

ACC Summer Preparedness HearingMarch 22, 2007


Eastern Mining Area

Phoenix

Peoria

Glendale

Scottsdale

Mesa

Tempe

Gilbert

Chandler

Tolleson

LitchfieldPark

Surprise

Goodyear

Avondale

ApacheJunction

QueenCreek

FountainHills

ParadiseValley

SRP Electric Service Territory


Summary

• Peak demand is expected to be higher than last year due to continued growth.

• Adequate resources have been secured to meet the anticipated demand.

• The risk of potential wildfires is a continuing concern.


Peak Load Forecast

6590 MW6627 MW

2006 Actual 2007 Forecast


Summer 2006 Retail System Peak ‘Needle Peak’

• Summer 2006 new peak – 6590 MW

• Exceeded Base Forecast of 6210 MW by 380 MW

– 16 hours

• Exceeded High Risk Forecast of 6448 MW by 150 MW (1:10 occurrence)

– 3 hours

• 118 degree Peak Temperature (1:10 occurrence)


Summer 2007 Outlook

SRPSRPGenerationGeneration

PurchasedPurchasedPowerPower

SRPSRPForecastForecast

Peak LoadPeak Load

ReservesReserves

5690 MW

1849 MW

Expected Need

6627 MW

912 MW

Total 7539 MW

Expected Capability

Total 7539 MW


Reserves• Respond to load extremes above base

forecast.• Provide an immediate response to forced

outages.• Quantity is based on NERC and WECC

operating criteria and contractual arrangements.

• A portfolio of resources is utilized to meet the reserve requirements.– Balances “reliability” and “low cost” objectives.


SRP Owned Generation – 2007

Coal1791 MW

Nuclear 672 MW

Gas2951 MW

Hydro & Renewables 276 MW

Total Capacity: 5690 MW


Purchased Power

• Purchased power portfolio is in place to meet demand.

• Additional purchases may be needed to respond to forced unit outages.

• Regional market conditions suggest that there will be sufficient capacity to meet the Arizona demand.


Fuel Status

• Nuclear – Full requirements under contract

• Coal– Plants expected to be at or above target

inventories by summer season– Full requirements under contract

• Natural Gas– Full transportation requirements under contract– In process of securing retail commodity

requirements – Distillate fuel back-up


Generation Maintenance Completed By Summer 2007

UnitsAgua Fria 1,2,3,4,5,6Craig 2Desert Basin 1,2Hayden 2Horse Mesa 1,2,4Kyrene 7Mormon Flat 1,2Navajo 2Palo Verde 1,2,3Roosevelt 1Santan 1,2,3,4,5Stewart Mountain 1


NEW NUMBER

- Distribution Substations 5

- 28MVA 69/12kV Transformers 9

- 230kV Breakers 12

- 69kV Breakers 43

- 69kV Capacitors 48 MVAR

-230/69kV Transformers 2

-500/230kV Transformers 1

System AdditionsStations


System AdditionsLines

ADDITIONS NUMBER

- Pole Replacements 620

- Rebuilt/Upgrade 69kV Lines 6.1 Miles

- New Circuit Miles of 69kV Line 20.6 Miles

- Rebuilt/Upgrade 230kV Lines 17.5 Miles

- New Circuit Miles of 230kV Line 9 Miles


System Preparation

Transmission and substation maintenance Transmission and substation maintenance and training will be complete by summer. and training will be complete by summer. This includes:This includes:

– Line patrols/inspections– Preventative maintenance– Pole re-enforcement– Pole change-outs/

upgrades– Wildfire coordination

– Tree trimming– Cable replacement – Storm planning– Emergency

procedure training– Blackstart training


• Facilities identification and location

• Direct communication between SRP and Agencies

• SRP Advisor Representative on-site

• Firefighting safety information

• Participate in State Drill and Southwest Mutual Assistance Committee

SRP/Wildland Fire CoordinationSRP/Wildland Fire Coordination


SRP Electric Facility Firefighting

• Support development of Pre-Plan Information for each facility.

• Provide Emergency Contact Information for each facility and responding firefighters.

• Integrate SRP representatives into Incident Command System management.

• Provide firefighter electrical safety awareness and facility orientation training.


Arizona EHV Transmission Systems

Glen CanyonGlen Canyon

ParkerParker

DavisDavis

Phil Young Phil Young (Greenlee)(Greenlee)

HaydenHaydenCraigCraig

PaloPaloVerdeVerde

ChollaCholla

MohaveMohave

CoronadoCoronado

SpringervilleSpringerville

KyreneKyrene

Four CornersFour Corners

NavajoNavajo San JuanSan Juan

ToToMiguelMiguel

ToToDeversDevers

Silver KingSilver King

North GilaNorth GilaSaguaroSaguaro

MeadMead

MoenkopiMoenkopi

WestwingWestwing

El DoradoEl DoradoMc CulloughMc CulloughMarketplaceMarketplace

PinnaclePinnaclePeakPeakLibertyLiberty

ShiprockShiprock

SouthSouth VailVail

TONEVADA

TOCALIFORNIA

TOUTAH

TONEW

MEXICO

TO COLORADO

TOPHOENIX AREA

TO TUCSONAREA

TONEW

MEXICO

TONEW

MEXICO

TOUTAH

NEW MEXICONEW MEXICOARIZONAARIZONAMEXICOMEXICO

COLORADOCOLORADOUTAHUTAHNEVADANEVADA

CALIFORNIA

NorthNorthNorthNorth

BrowningBrowningHassayampaHassayampa JojobaJojoba

RuddRudd

Electrical SubstationsElectrical Substations

Coal GenerationCoal Generation

Hydro GenerationHydro Generation

New Gas GenerationNew Gas Generation


Distribution• Summer operating procedures reviewed

and refresher training provided to O&M personnel.

• Six mobile substation transformers are available for service if needed.

• If required, the process for implementing rotating outages has been automated.

– The planned sequence of substation outages and the duration of each outage is the same as in the past.


Summary of Year 2007Projected Conditions

• Transmission, SRP generation and planned energy purchases are adequate to serve the forecasted year 2007 demand.

• Wildfires are our biggest concern.

• Contingency plans are in place to handle emergency events.


Documents

03/22/07 ACC Open MeetingSummer Preparedness 20071 SRP Summer Preparedness 2007 Mike Hummel Manager – Supply & Trading and Gary Harper Manager - System