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AnnualUsers’ Group MeetingAugust 27 – 31, 2006

APS Operating Vision

Scott Gudeman

August 28, 2006

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APS at a Glance

35,000 sq. mile service territory throughout AZ 1,000,000+ Customers 4.5% annual customer growth rate 10% annual peak MW demand growth, 7740MW in 2006 Very few mosquitoes No hurricanes No tornadoes Many monsoon storms Lot’s of Heat

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Today’s Operating Challenges at APS

Still on a paper wall maps

20+ year old mainframe OMS (TCMS)

Proprietary feeder tracing software

Five separate operating areas, operating independently

Long switching orders to move load around

Stand-alone EMS

Operating knowledge resides in a few Load Management Specialists (LMS)

Less interest from journeyman moving into LMS jobs

Data Integrity is still king!

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Operating Summary Problem

APS growth rate and winter to summer peak swing causes many APS feeders to go from a load of 40% to around 95% of capacity or greater for most of the summer. This causes significant challenges during outages and switching operations to pick up this load. A typical APS switching order is several pages long, may take a full day to get through and involve 4-5 substations and 10-12 feeders to pick up one lost feeder. This requires a bigger picture view of the feeders, their subs and the potential connections.

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Typical Wall Map

Load Cabinet

A/T Switch

By-Pass Cabinet

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Circuit Arrangement Map

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APS’ Future Operating Vision

Fully integrated, flexible DOMS that can operate the APS distribution system from anywhere in the state Allows for consolidation of operating centers

Eliminate the need for after-hour support and call outs for UG lateral sectionalizing and other similar issues in state operating areas

Simplifies I/S system impacts for providing infrastructure, bandwidth, disaster recovery for multiple sites

Standardize Metro and State Distribution Operations

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APS’ Future Operating Vision

Provide real time distribution management switching configuration Provides for better ticket grouping, improved knowledge of customers

impacted including key/critical customers, improved customer call back results. Bottom line-provides better customer service.

Replace Paper Wall Maps with GIS fed Electronic Geographic & Schematic views of distribution facilities Allow anyone to see any part of the distribution system at any given

time (with proper permissions!)

Enhanced backup

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APS’ Future Operating Vision

Provide integrated analysis tools Suggested Switching Orders and enhanced overall process of

Switching Order development Aid to operators for complex switching operations Training tool for less experienced operators Potential to reduce outage durations

Provide check on new facility designs with “What If” analysis tool Integration with EMS for key data Integrate with Maximo for equipment records Integration with key customer data Future integration with FeederAll Future integration with AMS

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APS’ Future Operating Vision

Ability to train new operators Build simulator for training operators

Test operators on abilities to certify

Bridge knowledge gap

Instant reports to manage outages Customers affected by outages

Instant outage metrics

Track individual customer outage history

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APS DOMS Workstation

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Goals to Sustain

Stay away from proprietary systems

Keep up with upgrades

Establish concrete processes and manage them

Establish knowledge transfer protocol

Integrate through the EAI bus

Develop Maintenance Optimization Program

Participate in user community