Undergrounding is typically more expensive than overhead lines to build and maintain, so most existing overhead systems remain above ground. Since the 1960s, most new distribution facilities have been designed and installed underground. For communities developed prior to the late 1960s, most distribution infrastructure is overhead.
The investor-owned utilities regulated by the CPUC have broad responsibilities to manage the electric utility distribution infrastructure. As part of their responsibilities, they build and maintain distribution facilities that service customers. Undergrounding also refers to the construction of new electric lines, line extensions, and service extensions built underground. pad mounts) for transformers and other equipment. Undergrounding refers to the conversion of existing overhead electric facilities, which consist of poles, wires and related equipment, to underground facilities, which consist of trenches lined with conduit which house the wires, underground vaults, and/or surface mounted structures (i.e. If you have any questions, please send an email to the mailbox. Undergrounding Frequently Asked Questions City of San Diego Undergrounding Surcharge Program Communications Tariff Rule 32 and Rule 40 Undergrounding Scenic Highways – Public Utilities Code Section 320 Underground Distribution and Service Line Extensions – Rules 15 and 16 Current Undergrounding Proceeding R.17-05-010
Since the late 1960’s, the CPUC’s undergrounding programs have contributed to the new construction and overhead to underground conversion of over 73,500 miles of distribution lines cumulatively. To date, about 33 percent of the 220,590 miles of distribution lines across the state are underground.īelow is a detailed overview of the benefits, challenges, and costs of undergrounding how undergrounding fits in the context of wildfire risk mitigation, the various undergrounding programs that the CPUC regulates the history of the undergrounding programs annual undergrounding reports to the CPUC and additional resources.įor public inquiries, please contact the Public Advisor’s Office at at 1-86.įor media inquiries, please reach out to the News and Outreach Office at at 41. Undergrounding electric distribution and transmission lines can beautify major thoroughfares, civic areas, scenic highways, and residential and commercial areas, elevate property value in communities, reduce urban and industrial blight, enhance electric reliability and make wildfire prone areas safer.
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