The sustained electrical surge to more than 200 East Palo Alto homes and businesses lasted for about one hour and 20 minutes, until a PG&E crew shut off the power, according to a Menlo Park Fire Protection District incident report.
Some Palo Alto Utilities engineers said what happened in East Palo Alto illustrates why Palo Alto is moving cautiously before installing similar devices. Palo Alto utilities spokeswoman Debbie Katz said that surges have not burned out the city's analog meters.
City utilities officials are conducting a thorough investigation before investing in the meters until glitches in the new technology are known and ways to remedy those glitches can be found, she said.
"The idea with SmartMeters is to make the customers' and the utility's life better, but this is a good example of how sometimes the old way is the good way," Katz said.
SmartMeters monitor customers' utility usage at least hourly, information that can be seen by the consumer, and it's also relayed daily to the utility company. The system allows consumers to adjust their power usage — a boon for consumers by lowering costs and for the company, according to PG&E.
PG&E maintains the SmartMeters are "just as robust" as the analog meters. PG&E has replaced 8.4 million analog meters for electricity and gas with the digital versions since 2006 and plans to upgrade additional meters to 10 million total in 2012, company spokesman Greg Snapper said. Fewer than 2 million of PG&E's remaining meters are analog.
He said SmartMeters have not caused any fires.
"A voltage surge can damage any type of meter, whether it's an analog or a SmartMeter. Any time you get a power surge of significantly more energy than a meter would normally experience, a meter can be damaged," he said.
Snapper said the issue is not about the meters but about power surges. The sparks and smoke that East Palo Alto residents saw are related to things happening along the route the excess electricity is taking.
"In a power surge, the electricity takes the path of least resistance," he said. The meter is one of the things in that pathway, he said.
Katz said the advantage of the analog meter is that it doesn't have internal electronics. When a power surge hits a digital meter, the extra jolt of electricity can disrupt the flow of data or even shut down the meter, she said.
But "the analog says, 'OK, whatever,' and keeps going. The SmartMeter says, 'Oh — I've got a headache and I can't think,'" she said.
Currently most meters in Palo Alto are analog, but about 3,000 to 4,000 are fitted with electronic receiver transmitters. Meter readers can read the data from a hand-held device at a distance and don't have to traipse through yards and gardens, she said.
The city's gas and water meters run on their own batteries, eliminating the need for electricity, and are not vulnerable to power surges, she said.
Snapper defended the SmartMeters' safety.
"PG&E's SmartMeters comply with the highest grade utility standards for safety, accuracy and reliability. PG&E's electric SmartMeter devices comply with the CPUC's required standards that were adopted by the American National Standards Institute," he said.
A spokesman for the meter's manufacturer, Landis and Gyr, could not be reached, and General Electric, which also supplies SmartMeters for PG&E, did not return calls.
PG&E has protections on its lines against power surges, Snapper said. "The particular way (the East Palo Alto) surge occurred created power-quality issues for customers and we apologize," he said.
Mindy Spatt, communications director for The Utility Reform Network (TURN), said the utility-consumer advocacy group received many complaints about surges damaging appliances when the SmartMeters were first installed. In the best-case scenario, the event in East Palo Alto is an additional cause for concern, she said.
"In the collective memory of TURN, we have not seen similar incidents with analog meters," she said.
The California Public Utilities Commission (CPUC) authorized a $1.7 billion budget in 2006 for PG&E's SmartMeter program. The upgrade was in response to the CPUC's 2002 direction for state utilities to find ways to decrease usage during high-demand periods.
In 2009 the CPUC authorized the utility to spend another $466.7 million to upgrade the SmartMeter program, according to a CPUC report.