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Sonoma Public Infrastructure (formerly TPW)

Underground Utilities Projects

Transportation and Public Works is now Sonoma Public Infrastructure - Website updates coming soon!

Power Lines Above Ground  Power Lines Below Ground


PG&E has two major efforts focused on undergrounding electric distribution lines: the 10,000-mile undergrounding program and Rule 20. The 10,000-mile undergrounding program is focused on reducing wildfire risk and is utility-driven. Rule 20 work is done under provisions of the company's Rule 20A, an electric tariff filed with the California Public Utilities Commission, and does not require projects to address wildfire risk. TPW acts as liaison between the utilities and property owners within an established underground utility district.

For more information on Rule 20A projects, including PG&Es status sheet, please visit:

Latest News - Rule 20 Project Updates

March 2023 - Freestone Project Schedule Update

The Freestone Rule 20A undergrounding project located along the Bohemian Highway and Freestone Street and construction is expected to start later this year, with the full project completion expected in early 2024. Please note, work schedules are tentative and subject to change due to weather, access and permitting, among other factors.

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