APS is piloting self-healing technologies on two main distribution lines in Flagstaff. Sensor devices are mounted on power lines and have the ability to communicate with one another and with central computer systems.

When a disruption occurs, the devices quickly narrow down the location, isolate it to the affected area and restore power everywhere else on the line.

In the simplest of cases, the sensors may also self-heal a fault. That is, they can determine a breaker is open on a line then automatically re-close it or re-route power so customers never experience a power outage.

"Self-isolating and self-healing technologies have the promise of significantly improving reliability," said APS Director of Smart Grid Development Barbara Lockwood. "These devices could cut down on the number of people affected by outages and the time it takes for APS to respond and make repairs. When perfected and widely deployed, this technology could be a game changer."

Today, for example, when a car hits a power pole, the entire line is affected and an entire neighborhood of customers might lose power. Often, APS must rely on customers to phone in the outage. With the new technologies, the sensoring devices communicate with one another and isolate the fault.

Only those customers closest to the accident would be without power. Instead of 2,000 customers without power, for instance, only 100-200 might be affected.

When outages occur, APS knows which equipment or power line to inspect but not necessarily the exact point that is affected. APS dispatches service crews to patrol the line. Through process of elimination, they identify the problem and work to restore power.

With the self-isolating technologies, the sensors tell APS dispatchers exactly where the fault took place. Crews then go right to that spot to make repairs, which could cut response times considerably.

The self-healing grid pilot is the latest in a long-standing effort by APS to maintain its position as one of the country's most reliable electric utilities. Last year, APS customers experienced an average of less than one outage per customer, compared to a 2008 industry median of 1.27 outages per customer. The company also excels in other key customer reliability measures such as low outage frequency and short average outage duration.

The self-healing technology pilot is part of APS's smart grid initiatives in Flagstaff, which include the Community Power Project, an innovative residential solar power program that will test the effects of a high concentration of solar energy on a single distribution line.

Separately, in 2009, APS also installed 36,000 advanced electric meters, which enable two-way digital communication and expand the ways customers can save energy and money.

APS, Arizona's largest and longest-serving electric utility, serves more than 1.1 million customers throughout the state. With headquarters in Phoenix, APS is the principal subsidiary of Pinnacle West Capital Corp. (NYSE: PNW).

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