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Brace for rolling blackouts, APS warns after fire
Tom Tingle/The Arizona Republic
Residents who woke up without power seek relief outside early Tuesday morning. They are (from left) Shelley Fenimore, Michele Fuhriman, Lauren Cope and Brenda Fuhriman.
Max Jarman and Brent Whiting
The Arizona RepublicThe Arizona Republic
Jul. 20, 2004 04:05 PM
Northwest Valley residents should be prepared for rolling blackouts later today as a result of an early morning transformer fire that compromised the electric power grid in the area.
The fire was blamed for a Glendale hospital temporarily losing power this afternoon.
The two areas most likely to face temporary outages are between Seventh and 67th avenues and Olive Avenue and Dynamite Boulevard, and between 67th and 115th avenues and Northern Avenue and Union Hills Drive, according to Arizona Public Service Co. spokesman Alan Bunnell.
"Service interruptions are likely in these areas today," Bunnell said.
Help The Arizona Republic cover the Valley's power crunch. If you learn of a power failure in the metro area today, please send an e-mail to
newstips@arizonarepublic.com or call 602-444-NEWS.
Please specify where the power is out, and if possible, provide a telephone number for someone in the affected area. Thank you.
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At about 2:30 p.m. Tuesday, Bunnell reported that no decision had been made about whether to implement rolling blackouts in the areas.
"We're holding out hope that we can avoid them," he said.
Because of the high temperatures expected Tuesday, other areas of the Valley could face blackouts during peak use hours, between 3 and 6 p.m. In that case, Salt River Project customers could be affected along with APS customers.
The good news, Bunnell said, is that the overall demand for electricity is lower than it was at the same time Monday.
"It's clear that people are heeding the messsage," he said.
Banner Thunderbird Medical Center lost power for 35 to 45 minutes Tuesday afternoon that was attributed to the transformer fire. Hospital spokeswoman Kristine Burnett says there are three power lines running into Thunderbird Sam. Each has a regulator that acts like a surge protector.
Apparently, problems caused by the transformer fire in northwest Phoenix early this morning caused two regulators to cut off power on those lines. A backup generator kicked in to help but eventually some systems and air conditioning began to go out.
Burnett says staff did a 60-second shutdown of the power system to bring the regulators back up. She says everything returned to normal. None of the patients had to be transferred.
The fire Tuesday morning was the second transformer fire in just over two weeks at an APS-operated substation. And it is the third serious failure of electrical equipment in the northwest Valley this summer.
A July 4 substation fire cut the Valley's capacity to import electricity by 20 percent and a June 14 power line short near 115th Avenue and Union Hills Drive caused 65,000 homes to experience rolling blackouts that day. APS also shut down the Palo Verde Nuclear Generating Station for a week.
The Office of Homeland Security has been notified of the latest fire, although terrorism is not suspected at this time.
Arizona Public Service and the Phoenix Fire Department are investigating the fire.
The fire started about 2:30 a.m. at Arizona Public Service's Deer Valley Substation at 35th Avenue and Yorkshire Drive. It destroyed one of three 230-kilovolt transformers at the station. The fire knocked out electricity to approximately 50,000 APS customers in the area. Power was restored to most residents within a few hours, but about 13,000 were without electricity until 8:45 a.m.
APS has identified two spare transformers that could be used to replace the one damaged by fire and is evaluating which one would make the most suitable replacement. Still, Bunnell said it could be several days before the damaged transformer is replaced.
Until then, northwest Valley residents will be vulnerable to rolling blackouts, given forecasts of high temperatures exceeding 110 degrees.
Since the July 4 fire, the Valley's power grid has been reconfigured to allow more electricity to be brought into the area. That will now make it more difficult to compensate for the damaged Deer Valley substation.
"We sacrificed redundancy to get more import capacity," Bunnell said.
Bunnell said blackouts in other parts of the Valley are possible given the expected high temperatures.
"We're going to need every one of our customers to conserve energy today, particularly from 3 p.m. to 6 p.m.," Bunnell said
APS' energy watch indicator was in the red zone early this morning, indicating need for consumers to cut their power use. By midmorning it had been reduced to yellow, indicating a need to conserve from 3 to 6 p.m.