The utility is using a new machine called the Bulldog Trencher to speed up undergrounding work in Placer County and other parts of the Sierra.
"This piece of equipment has done more than 1,000 feet today by cutting a pretty narrow trench road where we can put our power lines," Matt Pender, PG&E's vice president of undergrounding and system hardening, said on Tuesday.
The project is part of PG&E's broader effort to move power lines underground in areas vulnerable to wildfires.
"This will be a different experience for customers," Pender said. "They won't have overhead power lines, so they don't have to worry about that from a wildfire perspective, and they should see improved reliability."
PG&E estimates the work costs about $3 million per mile, prompting the utility to look for ways to reduce construction costs and speed up the process.
By the end of 2026, Pender said the company expects to have undergrounded about 1,600 miles of power lines statewide, including roughly 300 miles in Placer County.
PG&E says the newly installed underground power lines are expected to last at least 60 years.
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