Bold action to modernize our system

Undergrounding is the process of moving overhead electric distribution lines below ground. PG&E has two major programs focused on undergrounding: system hardening and the Rule 20 Program.

  • System hardening is part of our wildfire mitigation efforts. It focuses on strengthening the electric system with stronger poles and covered powerlines in addition to undergrounding in or near high fire-threat areas. Visit our System Hardening webpage to learn more.
  • The Rule 20 Program, which is explained in further detail below, undergrounds lines throughout the service area as part of an effort to make communities more scenic and beautiful.

These wildfire safety and undergrounding efforts make our system safer and more resilient. This positions us to better serve PG&E's customers and respond to our state's evolving climate challenges. Building and expanding our electric system underground will:

  • Help stop wildfires caused by equipment
  • Reduce public safety outages
  • Decrease the need for tree trimming
  • Improve system reliability
  • Beautify our hometowns

Meeting our state's climate challenges requires bold, innovative action. That's why we have launched the largest undergrounding effort designed to reduce wildfire risk in the U.S.

In 2021, PG&E announced a program to underground roughly 10,000 miles of powerlines located in or near high fire-threat areas. While we are continuing to develop additional details on our 10,000-mile undergrounding program, our goal is to significantly increase our underground miles annually. We've set a goal of completing approximately 1,200 miles of undergrounding per year, but it will take several years for that ramp-up to occur.

Additional information on our 10,000-mile undergrounding program can be found in our 2022 Wildfire Mitigation Plan and 2022 Wildfire Mitigation Plan News Release.

Download PG&E Undergrounding fact sheet (PDF, 2.29 MB)

For more information, you can contact us at or 1-877-295-4949.

PG&E also converts many miles of overhead electric facilities to underground annually. This work is completed by following the California Public Utilities Commission (CPUC) Rule 20 guideline that is an electric distribution tariff.

Rule 20 has three sections (A, B and C). The use of a particular Rule 20 section is determined by the type of area to be undergrounded and who pays for the work.

For more information on Rule 20, please see below. To view the current Rule 20 Annual Report (per Ordering Paragraph 14 of D.21-06-013), download the 2021 Rule 20 Annual Report (XLSX, 424 KB).