Pacific Gas and Electric Company (PG&E) announced a major new initiative to expand the undergrounding of electric distribution power lines in High Fire Threat Districts (HFTD) to further harden its system and help prevent wildfires.
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The new infrastructure safety initiative, announced in Butte County by PG&E Corporation CEO Patti Poppe, is a multi-year effort to underground approximately 10,000 miles of power lines.
PG&E's commitment represents the largest effort in the U.S. to underground power lines as a wildfire risk reduction measure.
"We want what all of our customers want: a safe and resilient energy system. We have taken a stand that catastrophic wildfires shall stop. We will partner with the best and the brightest to bring that stand to life. We will demand excellence of ourselves. We will gladly partner with policymakers and state and local leaders to map a path we can all believe in," Poppe said.
In addition to significantly reducing wildfire risk, undergrounding also benefits customers by lessening the need for Public Safety Power Shutoffs, which are called as a last resort during dry, windy conditions to reduce the risk of vegetation contacting live power lines and sparking a wildfire. Undergrounding also eases the need for vegetation management efforts, leaving more of California's trees untouched.
Today, PG&E maintains more than 25,000 miles of overhead distribution power lines in the highest fire-threat areas (Tier 2, Tier 3 and Zone 1)—which is more than 30% of its total distribution overhead system.
10,000 miles of PG&E lines represents approximately the distance of 11 round trips from Chico to Los Angeles or almost half way around the world. The exact number of projects or miles undergrounded each year through PG&E's new expanded undergrounding program will evolve as PG&E performs further project scoping and inspections, estimating and engineering review.
In the past, undergrounding has been done on a select, case-by-case basis, and largely for reasons other than wildfire risk reduction. Thanks to breakthroughs PG&E has achieved on undergrounding projects in recent years, undergrounding can now play a much more prominent role in PG&E's ongoing efforts to harden the electric grid.
Following the devastating October 2017 Northern California wildfires and the 2018 Camp Fire, PG&E began to evaluate placing overhead power lines underground as a wildfire safety measure, and to better understand the construction and cost requirements associated with undergrounding for system hardening purposes. ■
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