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Well PGE claims $3M/mile to underground tx lines

However, underground lines are not immune to weather damage and are vulnerable to equipment issues, lightning strikes, flooding, earthquakes, and excavation damage by a third party.

When underground systems are damaged, locating fault areas and undertaking excavation processes can be time-consuming. Underground lines can take almost twice as long to repair when damage occurs.

Undergrounding is also very costly.

A report prepared by the Edison Electric Institute, “Out of Sight, Out of Mind, An Updated Study on the Undergrounding of Overhead Power Lines,” (link to report) found that burying above-ground electric distribution systems can cost up to $5 million a mile in urban areas.
According to PG&E estimates, it costs approximately $3 million per mile to convert underground electric distribution lines from overhead. PG&E’s cost to build new overhead lines is approximately $150 per foot or $800,000 per mile.
New underground construction costs vary depending on trenching and paving costs. If paving costs are not included and trench costs are shared between multiple parties (e.g., gas and telephone) the overall new underground costs will be less than conversion costs.

PG&E safely maintains approximately 81,000 miles of overhead distribution lines and approximately 26,000 miles of underground distribution lines across its service area. PG&E’s electric transmission system is about 18,000 miles, the majority of which are overhead lines.

In the counties of Butte, Calavaras, Lake, Mendocino, Napa, Nevada, Sonoma and Yuba affected by the October 2017 North Bay fires, 118 miles of the 650 distribution miles are underground. Of the 118 miles, 80 of these underground miles are located in the Santa Rosa area. Most of these underground lines were installed as part of new residential and commercial subdivision developments.

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